* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
The branch can be fetched from github:
https://github.com/adam900710/u-boot/tree/btrfs_rebuild
The current btrfs code in U-boot is using a creative way to read on-disk
data.
It's pretty simple, involving the least amount of code, but pretty
different from btrfs-progs nor kernel, making it pretty hard to sync
code between different projects.
This big patchset will rework the btrfs support, to use code mostly from
btrfs-progs, thus all existing btrfs developers will feel at home.
During the rework, the following new features are added:
- More hash algorithm support
SHA256 and XXHASH support are added.
BLAKE2 needs more backport, will happen in a separate patchset.
- The ability to read degraded RAID1
Although we still only support one device btrfs, the new code base
can choose from different copies already.
As long as new device scan interface is provided, multi-device support
is pretty simple.
- More correct handling of compressed extents with offset
For compressed extent with offset, we should read the whole compressed
extent, decompress them, then copy the referred part.
There are some more features incoming, with the new code base it would
be much easier to implement:
- Data checksum support
The check would happen in read_extent_data(), btrfs-progs has the
needed facility to locate data csum.
- BLAKE2 support
Need BLAKE2 library cross ported.
For btrfs it's just several lines of modification.
- Multi-device support along wit degraded RAID support
We only need an interface to scan one device without opening it.
The infrastructure is already provided in this patchset.
These new features would be submitted after the patchset get merged,
since the patchset is already large, I don't want to make it more scary.
Although this patchset look horribly large, most of them are code copy
from btrfs-progs.
E.g extent-cache.[ch], rbtree-utils.[ch], btrfs_btree.h.
And ctree.h has over 1000 lines copied just for various accessors.
While for disk-io.[ch] and volumes-io.[ch], they have some small
modifications to adapt the interface of U-boot.
E.g. btrfs_device::fd is replace with blkdev_desc and disk_partition_t.
The new code for U-boot are related to the following functions:
- btrfs_readlink()
- btrfs_lookup_path()
- btrfs_read_extent_inline()
- btrfs_read_extent_reg()
- lookup_data_extent()
- btrfs_file_read()
Thus only the following 5 patches need extra review attention:
- Patch 0017
- Patch 0018
- Patch 0022
- Patch 0023
- Patch 0024
Qu Wenruo (26):
fs: btrfs: Sync btrfs_btree.h from kernel
fs: btrfs: Add More checksum algorithm support to btrfs
fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
fs: btrfs: Cross-port rbtree-utils from btrfs-progs
fs: btrfs: Cross-port extent-cache.[ch] from btrfs-progs
fs: btrfs: Cross-port extent-io.[ch] from btrfs-progs
fs: btrfs: Cross port structure accessor into ctree.h
fs: btrfs: Cross port volumes.[ch] from btrfs-progs
fs: btrfs: Crossport read_tree_block() from btrfs-progs
fs: btrfs: Rename struct btrfs_path to struct __btrfs_path
fs: btrfs: Rename btrfs_root to __btrfs_root
fs: btrfs: Cross port struct btrfs_root to ctree.h
fs: btrfs: Crossport btrfs_search_slot() from btrfs-progs
fs: btrfs: Crossport btrfs_read_sys_array() and
btrfs_read_chunk_tree()
fs: btrfs: Crossport open_ctree_fs_info()
fs: btrfs: Rename path resolve related functions to avoid name
conflicts
fs: btrfs: Use btrfs_readlink() to implement __btrfs_readlink()
fs: btrfs: Implement btrfs_lookup_path()
fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()
fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and
btrfs_size()
fs: btrfs: Rename btrfs_file_read() and its callees to avoid name
conflicts
fs: btrfs: Introduce btrfs_read_extent_inline() and
btrfs_read_extent_reg()
fs: btrfs: Introduce lookup_data_extent() for later use
fs: btrfs: Implement btrfs_file_read()
fs: btrfs: Cleanup the old implementation
MAINTAINERS: Add btrfs mail list
MAINTAINERS | 1 +
fs/btrfs/Makefile | 5 +-
fs/btrfs/btrfs.c | 311 +++---
fs/btrfs/btrfs.h | 67 +-
fs/btrfs/btrfs_tree.h | 766 --------------
fs/btrfs/chunk-map.c | 177 ----
fs/btrfs/common/rbtree-utils.c | 83 ++
fs/btrfs/common/rbtree-utils.h | 53 +
fs/btrfs/compat.h | 80 ++
fs/btrfs/compression.c | 2 +-
fs/btrfs/crypto/hash.c | 55 +
fs/btrfs/crypto/hash.h | 17 +
fs/btrfs/ctree.c | 866 ++++++++++++----
fs/btrfs/ctree.h | 1452 ++++++++++++++++++++++-----
fs/btrfs/dir-item.c | 192 ++--
fs/btrfs/disk-io.c | 1062 ++++++++++++++++++++
fs/btrfs/disk-io.h | 50 +
fs/btrfs/extent-cache.c | 318 ++++++
fs/btrfs/extent-cache.h | 104 ++
fs/btrfs/extent-io.c | 845 ++++++++++++++--
fs/btrfs/extent-io.h | 164 +++
fs/btrfs/hash.c | 38 -
fs/btrfs/inode.c | 879 +++++++++++-----
fs/btrfs/kernel-shared/btrfs_tree.h | 1333 ++++++++++++++++++++++++
fs/btrfs/root-tree.c | 47 +
fs/btrfs/root.c | 92 --
fs/btrfs/subvolume.c | 130 ---
fs/btrfs/super.c | 246 -----
fs/btrfs/volumes.c | 1173 ++++++++++++++++++++++
fs/btrfs/volumes.h | 204 ++++
30 files changed, 8308 insertions(+), 2504 deletions(-)
delete mode 100644 fs/btrfs/btrfs_tree.h
delete mode 100644 fs/btrfs/chunk-map.c
create mode 100644 fs/btrfs/common/rbtree-utils.c
create mode 100644 fs/btrfs/common/rbtree-utils.h
create mode 100644 fs/btrfs/compat.h
create mode 100644 fs/btrfs/crypto/hash.c
create mode 100644 fs/btrfs/crypto/hash.h
create mode 100644 fs/btrfs/disk-io.c
create mode 100644 fs/btrfs/disk-io.h
create mode 100644 fs/btrfs/extent-cache.c
create mode 100644 fs/btrfs/extent-cache.h
create mode 100644 fs/btrfs/extent-io.h
delete mode 100644 fs/btrfs/hash.c
create mode 100644 fs/btrfs/kernel-shared/btrfs_tree.h
create mode 100644 fs/btrfs/root-tree.c
delete mode 100644 fs/btrfs/root.c
delete mode 100644 fs/btrfs/subvolume.c
delete mode 100644 fs/btrfs/super.c
create mode 100644 fs/btrfs/volumes.c
create mode 100644 fs/btrfs/volumes.h
--
2.26.0
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
The branch can be fetched from github:
https://github.com/adam900710/u-boot/tree/btrfs_rebuild
The current btrfs code in U-boot is using a creative way to read on-disk
data.
It's pretty simple, involving the least amount of code, but pretty
different from btrfs-progs nor kernel, making it pretty hard to sync
code between different projects.
This big patchset will rework the btrfs support, to use code mostly from
btrfs-progs, thus all existing btrfs developers will feel at home.
During the rework, the following new features are added:
- More hash algorithm support
SHA256 and XXHASH support are added.
BLAKE2 needs more backport, will happen in a separate patchset.
- The ability to read degraded RAID1
Although we still only support one device btrfs, the new code base
can choose from different copies already.
As long as new device scan interface is provided, multi-device support
is pretty simple.
- More correct handling of compressed extents with offset
For compressed extent with offset, we should read the whole compressed
extent, decompress them, then copy the referred part.
There are some more features incoming, with the new code base it would
be much easier to implement:
- Data checksum support
The check would happen in read_extent_data(), btrfs-progs has the
needed facility to locate data csum.
- BLAKE2 support
Need BLAKE2 library cross ported.
For btrfs it's just several lines of modification.
- Multi-device support along wit degraded RAID support
We only need an interface to scan one device without opening it.
The infrastructure is already provided in this patchset.
These new features would be submitted after the patchset get merged,
since the patchset is already large, I don't want to make it more scary.
Although this patchset look horribly large, most of them are code copy
from btrfs-progs.
E.g extent-cache.[ch], rbtree-utils.[ch], btrfs_btree.h.
And ctree.h has over 1000 lines copied just for various accessors.
While for disk-io.[ch] and volumes-io.[ch], they have some small
modifications to adapt the interface of U-boot.
E.g. btrfs_device::fd is replace with blkdev_desc and disk_partition_t.
The new code for U-boot are related to the following functions:
- btrfs_readlink()
- btrfs_lookup_path()
- btrfs_read_extent_inline()
- btrfs_read_extent_reg()
- lookup_data_extent()
- btrfs_file_read()
Thus only the following 5 patches need extra review attention:
- Patch 0017
- Patch 0018
- Patch 0022
- Patch 0023
- Patch 0024
Qu Wenruo (26):
fs: btrfs: Sync btrfs_btree.h from kernel
fs: btrfs: Add More checksum algorithm support to btrfs
fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
fs: btrfs: Cross-port rbtree-utils from btrfs-progs
fs: btrfs: Cross-port extent-cache.[ch] from btrfs-progs
fs: btrfs: Cross-port extent-io.[ch] from btrfs-progs
fs: btrfs: Cross port structure accessor into ctree.h
fs: btrfs: Cross port volumes.[ch] from btrfs-progs
fs: btrfs: Crossport read_tree_block() from btrfs-progs
fs: btrfs: Rename struct btrfs_path to struct __btrfs_path
fs: btrfs: Rename btrfs_root to __btrfs_root
fs: btrfs: Cross port struct btrfs_root to ctree.h
fs: btrfs: Crossport btrfs_search_slot() from btrfs-progs
fs: btrfs: Crossport btrfs_read_sys_array() and
btrfs_read_chunk_tree()
fs: btrfs: Crossport open_ctree_fs_info()
fs: btrfs: Rename path resolve related functions to avoid name
conflicts
fs: btrfs: Use btrfs_readlink() to implement __btrfs_readlink()
fs: btrfs: Implement btrfs_lookup_path()
fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()
fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and
btrfs_size()
fs: btrfs: Rename btrfs_file_read() and its callees to avoid name
conflicts
fs: btrfs: Introduce btrfs_read_extent_inline() and
btrfs_read_extent_reg()
fs: btrfs: Introduce lookup_data_extent() for later use
fs: btrfs: Implement btrfs_file_read()
fs: btrfs: Cleanup the old implementation
MAINTAINERS: Add btrfs mail list
MAINTAINERS | 1 +
fs/btrfs/Makefile | 5 +-
fs/btrfs/btrfs.c | 311 +++---
fs/btrfs/btrfs.h | 67 +-
fs/btrfs/btrfs_tree.h | 766 --------------
fs/btrfs/chunk-map.c | 177 ----
fs/btrfs/common/rbtree-utils.c | 83 ++
fs/btrfs/common/rbtree-utils.h | 53 +
fs/btrfs/compat.h | 80 ++
fs/btrfs/compression.c | 2 +-
fs/btrfs/crypto/hash.c | 55 +
fs/btrfs/crypto/hash.h | 17 +
fs/btrfs/ctree.c | 866 ++++++++++++----
fs/btrfs/ctree.h | 1452 ++++++++++++++++++++++-----
fs/btrfs/dir-item.c | 192 ++--
fs/btrfs/disk-io.c | 1062 ++++++++++++++++++++
fs/btrfs/disk-io.h | 50 +
fs/btrfs/extent-cache.c | 318 ++++++
fs/btrfs/extent-cache.h | 104 ++
fs/btrfs/extent-io.c | 845 ++++++++++++++--
fs/btrfs/extent-io.h | 164 +++
fs/btrfs/hash.c | 38 -
fs/btrfs/inode.c | 879 +++++++++++-----
fs/btrfs/kernel-shared/btrfs_tree.h | 1333 ++++++++++++++++++++++++
fs/btrfs/root-tree.c | 47 +
fs/btrfs/root.c | 92 --
fs/btrfs/subvolume.c | 130 ---
fs/btrfs/super.c | 246 -----
fs/btrfs/volumes.c | 1173 ++++++++++++++++++++++
fs/btrfs/volumes.h | 204 ++++
30 files changed, 8308 insertions(+), 2504 deletions(-)
delete mode 100644 fs/btrfs/btrfs_tree.h
delete mode 100644 fs/btrfs/chunk-map.c
create mode 100644 fs/btrfs/common/rbtree-utils.c
create mode 100644 fs/btrfs/common/rbtree-utils.h
create mode 100644 fs/btrfs/compat.h
create mode 100644 fs/btrfs/crypto/hash.c
create mode 100644 fs/btrfs/crypto/hash.h
create mode 100644 fs/btrfs/disk-io.c
create mode 100644 fs/btrfs/disk-io.h
create mode 100644 fs/btrfs/extent-cache.c
create mode 100644 fs/btrfs/extent-cache.h
create mode 100644 fs/btrfs/extent-io.h
delete mode 100644 fs/btrfs/hash.c
create mode 100644 fs/btrfs/kernel-shared/btrfs_tree.h
create mode 100644 fs/btrfs/root-tree.c
delete mode 100644 fs/btrfs/root.c
delete mode 100644 fs/btrfs/subvolume.c
delete mode 100644 fs/btrfs/super.c
create mode 100644 fs/btrfs/volumes.c
create mode 100644 fs/btrfs/volumes.h
--
2.26.0
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 01/26] fs: btrfs: Sync btrfs_btree.h from kernel
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This version includes all needed on-disk format from kernel.
Only need to modify the include headers for u-boot, everything else is
untouched.
Also, since u-boot btrfs is using a different endian convert timing (at
tree block read time), it needs some forced type conversion before
proper cross port.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 3 +-
fs/btrfs/btrfs_tree.h | 766 ---------------
fs/btrfs/ctree.h | 214 +----
fs/btrfs/inode.c | 5 +-
fs/btrfs/kernel-shared/btrfs_tree.h | 1333 +++++++++++++++++++++++++++
fs/btrfs/root.c | 2 +-
fs/btrfs/subvolume.c | 2 +-
7 files changed, 1343 insertions(+), 982 deletions(-)
delete mode 100644 fs/btrfs/btrfs_tree.h
create mode 100644 fs/btrfs/kernel-shared/btrfs_tree.h
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index cb7e18274221..5d3ddd5931f0 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -31,7 +31,8 @@ static int readdir_callback(const struct btrfs_root *root,
char filetime[32], *target = NULL;
time_t mtime;
- if (btrfs_lookup_inode(root, &item->location, &inode, NULL)) {
+ if (btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
+ &inode, NULL)) {
printf("%s: Cannot find inode item for directory entry %.*s!\n",
__func__, item->name_len, name);
return 0;
diff --git a/fs/btrfs/btrfs_tree.h b/fs/btrfs/btrfs_tree.h
deleted file mode 100644
index aa0f3d6c86dd..000000000000
--- a/fs/btrfs/btrfs_tree.h
+++ /dev/null
@@ -1,766 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * From linux/include/uapi/linux/btrfs_tree.h
- */
-
-#ifndef __BTRFS_BTRFS_TREE_H__
-#define __BTRFS_BTRFS_TREE_H__
-
-#include <common.h>
-
-#define BTRFS_VOL_NAME_MAX 255
-#define BTRFS_NAME_MAX 255
-#define BTRFS_LABEL_SIZE 256
-#define BTRFS_FSID_SIZE 16
-#define BTRFS_UUID_SIZE 16
-
-/*
- * This header contains the structure definitions and constants used
- * by file system objects that can be retrieved using
- * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that
- * is needed to describe a leaf node's key or item contents.
- */
-
-/* holds pointers to all of the tree roots */
-#define BTRFS_ROOT_TREE_OBJECTID 1ULL
-
-/* stores information about which extents are in use, and reference counts */
-#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
-
-/*
- * chunk tree stores translations from logical -> physical block numbering
- * the super block points to the chunk tree
- */
-#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
-
-/*
- * stores information about which areas of a given device are in use.
- * one per device. The tree of tree roots points to the device tree
- */
-#define BTRFS_DEV_TREE_OBJECTID 4ULL
-
-/* one per subvolume, storing files and directories */
-#define BTRFS_FS_TREE_OBJECTID 5ULL
-
-/* directory objectid inside the root tree */
-#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
-
-/* holds checksums of all the data extents */
-#define BTRFS_CSUM_TREE_OBJECTID 7ULL
-
-/* holds quota configuration and tracking */
-#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
-
-/* for storing items that use the BTRFS_UUID_KEY* types */
-#define BTRFS_UUID_TREE_OBJECTID 9ULL
-
-/* tracks free space in block groups. */
-#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
-
-/* device stats in the device tree */
-#define BTRFS_DEV_STATS_OBJECTID 0ULL
-
-/* for storing balance parameters in the root tree */
-#define BTRFS_BALANCE_OBJECTID -4ULL
-
-/* orhpan objectid for tracking unlinked/truncated files */
-#define BTRFS_ORPHAN_OBJECTID -5ULL
-
-/* does write ahead logging to speed up fsyncs */
-#define BTRFS_TREE_LOG_OBJECTID -6ULL
-#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
-
-/* for space balancing */
-#define BTRFS_TREE_RELOC_OBJECTID -8ULL
-#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
-
-/*
- * extent checksums all have this objectid
- * this allows them to share the logging tree
- * for fsyncs
- */
-#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
-
-/* For storing free space cache */
-#define BTRFS_FREE_SPACE_OBJECTID -11ULL
-
-/*
- * The inode number assigned to the special inode for storing
- * free ino cache
- */
-#define BTRFS_FREE_INO_OBJECTID -12ULL
-
-/* dummy objectid represents multiple objectids */
-#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
-
-/*
- * All files have objectids in this range.
- */
-#define BTRFS_FIRST_FREE_OBJECTID 256ULL
-#define BTRFS_LAST_FREE_OBJECTID -256ULL
-#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
-
-
-/*
- * the device items go into the chunk tree. The key is in the form
- * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
- */
-#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
-
-#define BTRFS_BTREE_INODE_OBJECTID 1
-
-#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
-
-#define BTRFS_DEV_REPLACE_DEVID 0ULL
-
-/*
- * inode items have the data typically returned from stat and store other
- * info about object characteristics. There is one for every file and dir in
- * the FS
- */
-#define BTRFS_INODE_ITEM_KEY 1
-#define BTRFS_INODE_REF_KEY 12
-#define BTRFS_INODE_EXTREF_KEY 13
-#define BTRFS_XATTR_ITEM_KEY 24
-#define BTRFS_ORPHAN_ITEM_KEY 48
-/* reserve 2-15 close to the inode for later flexibility */
-
-/*
- * dir items are the name -> inode pointers in a directory. There is one
- * for every name in a directory.
- */
-#define BTRFS_DIR_LOG_ITEM_KEY 60
-#define BTRFS_DIR_LOG_INDEX_KEY 72
-#define BTRFS_DIR_ITEM_KEY 84
-#define BTRFS_DIR_INDEX_KEY 96
-/*
- * extent data is for file data
- */
-#define BTRFS_EXTENT_DATA_KEY 108
-
-/*
- * extent csums are stored in a separate tree and hold csums for
- * an entire extent on disk.
- */
-#define BTRFS_EXTENT_CSUM_KEY 128
-
-/*
- * root items point to tree roots. They are typically in the root
- * tree used by the super block to find all the other trees
- */
-#define BTRFS_ROOT_ITEM_KEY 132
-
-/*
- * root backrefs tie subvols and snapshots to the directory entries that
- * reference them
- */
-#define BTRFS_ROOT_BACKREF_KEY 144
-
-/*
- * root refs make a fast index for listing all of the snapshots and
- * subvolumes referenced by a given root. They point directly to the
- * directory item in the root that references the subvol
- */
-#define BTRFS_ROOT_REF_KEY 156
-
-/*
- * extent items are in the extent map tree. These record which blocks
- * are used, and how many references there are to each block
- */
-#define BTRFS_EXTENT_ITEM_KEY 168
-
-/*
- * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
- * the length, so we save the level in key->offset instead of the length.
- */
-#define BTRFS_METADATA_ITEM_KEY 169
-
-#define BTRFS_TREE_BLOCK_REF_KEY 176
-
-#define BTRFS_EXTENT_DATA_REF_KEY 178
-
-#define BTRFS_EXTENT_REF_V0_KEY 180
-
-#define BTRFS_SHARED_BLOCK_REF_KEY 182
-
-#define BTRFS_SHARED_DATA_REF_KEY 184
-
-/*
- * block groups give us hints into the extent allocation trees. Which
- * blocks are free etc etc
- */
-#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
-
-/*
- * Every block group is represented in the free space tree by a free space info
- * item, which stores some accounting information. It is keyed on
- * (block_group_start, FREE_SPACE_INFO, block_group_length).
- */
-#define BTRFS_FREE_SPACE_INFO_KEY 198
-
-/*
- * A free space extent tracks an extent of space that is free in a block group.
- * It is keyed on (start, FREE_SPACE_EXTENT, length).
- */
-#define BTRFS_FREE_SPACE_EXTENT_KEY 199
-
-/*
- * When a block group becomes very fragmented, we convert it to use bitmaps
- * instead of extents. A free space bitmap is keyed on
- * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
- * (length / sectorsize) bits.
- */
-#define BTRFS_FREE_SPACE_BITMAP_KEY 200
-
-#define BTRFS_DEV_EXTENT_KEY 204
-#define BTRFS_DEV_ITEM_KEY 216
-#define BTRFS_CHUNK_ITEM_KEY 228
-
-/*
- * Records the overall state of the qgroups.
- * There's only one instance of this key present,
- * (0, BTRFS_QGROUP_STATUS_KEY, 0)
- */
-#define BTRFS_QGROUP_STATUS_KEY 240
-/*
- * Records the currently used space of the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_INFO_KEY 242
-/*
- * Contains the user configured limits for the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_LIMIT_KEY 244
-/*
- * Records the child-parent relationship of qgroups. For
- * each relation, 2 keys are present:
- * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
- * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
- */
-#define BTRFS_QGROUP_RELATION_KEY 246
-
-/*
- * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
- */
-#define BTRFS_BALANCE_ITEM_KEY 248
-
-/*
- * The key type for tree items that are stored persistently, but do not need to
- * exist for extended period of time. The items can exist in any tree.
- *
- * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - balance status item
- * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
- */
-#define BTRFS_TEMPORARY_ITEM_KEY 248
-
-/*
- * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
- */
-#define BTRFS_DEV_STATS_KEY 249
-
-/*
- * The key type for tree items that are stored persistently and usually exist
- * for a long period, eg. filesystem lifetime. The item kinds can be status
- * information, stats or preference values. The item can exist in any tree.
- *
- * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - device statistics, store IO stats in the device tree, one key for all
- * stats
- * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
- */
-#define BTRFS_PERSISTENT_ITEM_KEY 249
-
-/*
- * Persistantly stores the device replace state in the device tree.
- * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
- */
-#define BTRFS_DEV_REPLACE_KEY 250
-
-/*
- * Stores items that allow to quickly map UUIDs to something else.
- * These items are part of the filesystem UUID tree.
- * The key is built like this:
- * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
- */
-#if BTRFS_UUID_SIZE != 16
-#error "UUID items require BTRFS_UUID_SIZE == 16!"
-#endif
-#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
-#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
- * received subvols */
-
-/*
- * string items are for debugging. They just store a short string of
- * data in the FS
- */
-#define BTRFS_STRING_ITEM_KEY 253
-
-
-
-/* 32 bytes in various csum fields */
-#define BTRFS_CSUM_SIZE 32
-
-/* csum types */
-#define BTRFS_CSUM_TYPE_CRC32 0
-
-/*
- * flags definitions for directory entry item type
- *
- * Used by:
- * struct btrfs_dir_item.type
- */
-#define BTRFS_FT_UNKNOWN 0
-#define BTRFS_FT_REG_FILE 1
-#define BTRFS_FT_DIR 2
-#define BTRFS_FT_CHRDEV 3
-#define BTRFS_FT_BLKDEV 4
-#define BTRFS_FT_FIFO 5
-#define BTRFS_FT_SOCK 6
-#define BTRFS_FT_SYMLINK 7
-#define BTRFS_FT_XATTR 8
-#define BTRFS_FT_MAX 9
-
-/*
- * The key defines the order in the tree, and so it also defines (optimal)
- * block layout.
- *
- * objectid corresponds to the inode number.
- *
- * type tells us things about the object, and is a kind of stream selector.
- * so for a given inode, keys with type of 1 might refer to the inode data,
- * type of 2 may point to file data in the btree and type == 3 may point to
- * extents.
- *
- * offset is the starting byte offset for this key in the stream.
- */
-
-struct btrfs_key {
- __u64 objectid;
- __u8 type;
- __u64 offset;
-} __attribute__ ((__packed__));
-
-struct btrfs_dev_item {
- /* the internal btrfs device id */
- __u64 devid;
-
- /* size of the device */
- __u64 total_bytes;
-
- /* bytes used */
- __u64 bytes_used;
-
- /* optimal io alignment for this device */
- __u32 io_align;
-
- /* optimal io width for this device */
- __u32 io_width;
-
- /* minimal io size for this device */
- __u32 sector_size;
-
- /* type and info about this device */
- __u64 type;
-
- /* expected generation for this device */
- __u64 generation;
-
- /*
- * starting byte of this partition on the device,
- * to allow for stripe alignment in the future
- */
- __u64 start_offset;
-
- /* grouping information for allocation decisions */
- __u32 dev_group;
-
- /* seek speed 0-100 where 100 is fastest */
- __u8 seek_speed;
-
- /* bandwidth 0-100 where 100 is fastest */
- __u8 bandwidth;
-
- /* btrfs generated uuid for this device */
- __u8 uuid[BTRFS_UUID_SIZE];
-
- /* uuid of FS who owns this device */
- __u8 fsid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_stripe {
- __u64 devid;
- __u64 offset;
- __u8 dev_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_chunk {
- /* size of this chunk in bytes */
- __u64 length;
-
- /* objectid of the root referencing this chunk */
- __u64 owner;
-
- __u64 stripe_len;
- __u64 type;
-
- /* optimal io alignment for this chunk */
- __u32 io_align;
-
- /* optimal io width for this chunk */
- __u32 io_width;
-
- /* minimal io size for this chunk */
- __u32 sector_size;
-
- /* 2^16 stripes is quite a lot, a second limit is the size of a single
- * item in the btree
- */
- __u16 num_stripes;
-
- /* sub stripes only matter for raid10 */
- __u16 sub_stripes;
- struct btrfs_stripe stripe;
- /* additional stripes go here */
-} __attribute__ ((__packed__));
-
-#define BTRFS_FREE_SPACE_EXTENT 1
-#define BTRFS_FREE_SPACE_BITMAP 2
-
-struct btrfs_free_space_entry {
- __u64 offset;
- __u64 bytes;
- __u8 type;
-} __attribute__ ((__packed__));
-
-struct btrfs_free_space_header {
- struct btrfs_key location;
- __u64 generation;
- __u64 num_entries;
- __u64 num_bitmaps;
-} __attribute__ ((__packed__));
-
-#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
-#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
-
-/* Super block flags */
-/* Errors detected */
-#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
-
-#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
-#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
-
-
-/*
- * items in the extent btree are used to record the objectid of the
- * owner of the block and the number of references
- */
-
-struct btrfs_extent_item {
- __u64 refs;
- __u64 generation;
- __u64 flags;
-} __attribute__ ((__packed__));
-
-
-#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
-#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
-
-/* following flags only apply to tree blocks */
-
-/* use full backrefs for extent pointers in the block */
-#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
-
-/*
- * this flag is only used internally by scrub and may be changed at any time
- * it is only declared here to avoid collisions
- */
-#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
-
-struct btrfs_tree_block_info {
- struct btrfs_key key;
- __u8 level;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_data_ref {
- __u64 root;
- __u64 objectid;
- __u64 offset;
- __u32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_shared_data_ref {
- __u32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_inline_ref {
- __u8 type;
- __u64 offset;
-} __attribute__ ((__packed__));
-
-/* dev extents record free space on individual devices. The owner
- * field points back to the chunk allocation mapping tree that allocated
- * the extent. The chunk tree uuid field is a way to double check the owner
- */
-struct btrfs_dev_extent {
- __u64 chunk_tree;
- __u64 chunk_objectid;
- __u64 chunk_offset;
- __u64 length;
- __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_ref {
- __u64 index;
- __u16 name_len;
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_extref {
- __u64 parent_objectid;
- __u64 index;
- __u16 name_len;
- __u8 name[0];
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_timespec {
- __u64 sec;
- __u32 nsec;
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_item {
- /* nfs style generation number */
- __u64 generation;
- /* transid that last touched this inode */
- __u64 transid;
- __u64 size;
- __u64 nbytes;
- __u64 block_group;
- __u32 nlink;
- __u32 uid;
- __u32 gid;
- __u32 mode;
- __u64 rdev;
- __u64 flags;
-
- /* modification sequence number for NFS */
- __u64 sequence;
-
- /*
- * a little future expansion, for more than this we can
- * just grow the inode item and version it
- */
- __u64 reserved[4];
- struct btrfs_timespec atime;
- struct btrfs_timespec ctime;
- struct btrfs_timespec mtime;
- struct btrfs_timespec otime;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_log_item {
- __u64 end;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_item {
- struct btrfs_key location;
- __u64 transid;
- __u16 data_len;
- __u16 name_len;
- __u8 type;
-} __attribute__ ((__packed__));
-
-#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
-
-/*
- * Internal in-memory flag that a subvolume has been marked for deletion but
- * still visible as a directory
- */
-#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
-
-struct btrfs_root_item {
- struct btrfs_inode_item inode;
- __u64 generation;
- __u64 root_dirid;
- __u64 bytenr;
- __u64 byte_limit;
- __u64 bytes_used;
- __u64 last_snapshot;
- __u64 flags;
- __u32 refs;
- struct btrfs_key drop_progress;
- __u8 drop_level;
- __u8 level;
-
- /*
- * The following fields appear after subvol_uuids+subvol_times
- * were introduced.
- */
-
- /*
- * This generation number is used to test if the new fields are valid
- * and up to date while reading the root item. Every time the root item
- * is written out, the "generation" field is copied into this field. If
- * anyone ever mounted the fs with an older kernel, we will have
- * mismatching generation values here and thus must invalidate the
- * new fields. See btrfs_update_root and btrfs_find_last_root for
- * details.
- * the offset of generation_v2 is also used as the start for the memset
- * when invalidating the fields.
- */
- __u64 generation_v2;
- __u8 uuid[BTRFS_UUID_SIZE];
- __u8 parent_uuid[BTRFS_UUID_SIZE];
- __u8 received_uuid[BTRFS_UUID_SIZE];
- __u64 ctransid; /* updated when an inode changes */
- __u64 otransid; /* trans when created */
- __u64 stransid; /* trans when sent. non-zero for received subvol */
- __u64 rtransid; /* trans when received. non-zero for received subvol */
- struct btrfs_timespec ctime;
- struct btrfs_timespec otime;
- struct btrfs_timespec stime;
- struct btrfs_timespec rtime;
- __u64 reserved[8]; /* for future */
-} __attribute__ ((__packed__));
-
-/*
- * this is used for both forward and backward root refs
- */
-struct btrfs_root_ref {
- __u64 dirid;
- __u64 sequence;
- __u16 name_len;
-} __attribute__ ((__packed__));
-
-#define BTRFS_FILE_EXTENT_INLINE 0
-#define BTRFS_FILE_EXTENT_REG 1
-#define BTRFS_FILE_EXTENT_PREALLOC 2
-
-enum btrfs_compression_type {
- BTRFS_COMPRESS_NONE = 0,
- BTRFS_COMPRESS_ZLIB = 1,
- BTRFS_COMPRESS_LZO = 2,
- BTRFS_COMPRESS_ZSTD = 3,
- BTRFS_COMPRESS_TYPES = 3,
- BTRFS_COMPRESS_LAST = 4,
-};
-
-struct btrfs_file_extent_item {
- /*
- * transaction id that created this extent
- */
- __u64 generation;
- /*
- * max number of bytes to hold this extent in ram
- * when we split a compressed extent we can't know how big
- * each of the resulting pieces will be. So, this is
- * an upper limit on the size of the extent in ram instead of
- * an exact limit.
- */
- __u64 ram_bytes;
-
- /*
- * 32 bits for the various ways we might encode the data,
- * including compression and encryption. If any of these
- * are set to something a given disk format doesn't understand
- * it is treated like an incompat flag for reading and writing,
- * but not for stat.
- */
- __u8 compression;
- __u8 encryption;
- __u16 other_encoding; /* spare for later use */
-
- /* are we inline data or a real extent? */
- __u8 type;
-
- /*
- * disk space consumed by the extent, checksum blocks are included
- * in these numbers
- *
- * At this offset in the structure, the inline extent data start.
- */
- __u64 disk_bytenr;
- __u64 disk_num_bytes;
- /*
- * the logical offset in file blocks (no csums)
- * this extent record is for. This allows a file extent to point
- * into the middle of an existing extent on disk, sharing it
- * between two snapshots (useful if some bytes in the middle of the
- * extent have changed
- */
- __u64 offset;
- /*
- * the logical number of file blocks (no csums included). This
- * always reflects the size uncompressed and without encoding.
- */
- __u64 num_bytes;
-
-} __attribute__ ((__packed__));
-
-struct btrfs_csum_item {
- __u8 csum;
-} __attribute__ ((__packed__));
-
-/* different types of block groups (and chunks) */
-#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
-#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
-#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
-#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
-#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
-#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
-#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
-#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
-#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
-#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
- BTRFS_SPACE_INFO_GLOBAL_RSV)
-
-enum btrfs_raid_types {
- BTRFS_RAID_RAID10,
- BTRFS_RAID_RAID1,
- BTRFS_RAID_DUP,
- BTRFS_RAID_RAID0,
- BTRFS_RAID_SINGLE,
- BTRFS_RAID_RAID5,
- BTRFS_RAID_RAID6,
- BTRFS_NR_RAID_TYPES
-};
-
-#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
- BTRFS_BLOCK_GROUP_SYSTEM | \
- BTRFS_BLOCK_GROUP_METADATA)
-
-#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
- BTRFS_BLOCK_GROUP_RAID1 | \
- BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6 | \
- BTRFS_BLOCK_GROUP_DUP | \
- BTRFS_BLOCK_GROUP_RAID10)
-#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6)
-
-/*
- * We need a bit for restriper to be able to tell when chunks of type
- * SINGLE are available. This "extended" profile format is used in
- * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
- * (on-disk). The corresponding on-disk bit in chunk.type is reserved
- * to avoid remappings between two formats in future.
- */
-#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
-
-/*
- * A fake block group type that is used to communicate global block reserve
- * size to userspace via the SPACE_INFO ioctl.
- */
-#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
-
-#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
- BTRFS_AVAIL_ALLOC_BIT_SINGLE)
-
-#endif /* __BTRFS_BTRFS_TREE_H__ */
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 65c152a52fcf..156ce69ed022 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -11,28 +11,16 @@
#include <common.h>
#include <compiler.h>
-#include "btrfs_tree.h"
-
-#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
+#include "kernel-shared/btrfs_tree.h"
#define BTRFS_MAX_MIRRORS 3
-#define BTRFS_MAX_LEVEL 8
-
-#define BTRFS_COMPAT_EXTENT_TREE_V0
-
/*
* the max metadata block size. This limit is somewhat artificial,
* but the memmove costs go through the roof for larger blocks.
*/
#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
-/*
- * we can actually store much bigger names, but lets not confuse the rest
- * of linux
- */
-#define BTRFS_NAME_LEN 255
-
/*
* Theoretical limit is larger, but we keep this down to a sane
* value. That should limit greatly the possibility of collisions on
@@ -40,8 +28,6 @@
*/
#define BTRFS_LINK_MAX 65535U
-static const int btrfs_csum_sizes[] = { 4 };
-
/* four bytes for CRC32 */
#define BTRFS_EMPTY_DIR_SIZE 0
@@ -61,207 +47,12 @@ static const int btrfs_csum_sizes[] = { 4 };
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
-#define BTRFS_BACKREF_REV_MAX 256
-#define BTRFS_BACKREF_REV_SHIFT 56
-#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
- BTRFS_BACKREF_REV_SHIFT)
-
-#define BTRFS_OLD_BACKREF_REV 0
-#define BTRFS_MIXED_BACKREF_REV 1
-
-/*
- * every tree block (leaf or node) starts with this header.
- */
-struct btrfs_header {
- /* these first four must match the super block */
- __u8 csum[BTRFS_CSUM_SIZE];
- __u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- __u64 bytenr; /* which block this node is supposed to live in */
- __u64 flags;
-
- /* allowed to be different from the super from here on down */
- __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- __u64 generation;
- __u64 owner;
- __u32 nritems;
- __u8 level;
-} __attribute__ ((__packed__));
-
-/*
- * this is a very generous portion of the super block, giving us
- * room to translate 14 chunks with 3 stripes each.
- */
-#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
-
-/*
- * just in case we somehow lose the roots and are not able to mount,
- * we store an array of the roots from previous transactions
- * in the super.
- */
-#define BTRFS_NUM_BACKUP_ROOTS 4
-struct btrfs_root_backup {
- __u64 tree_root;
- __u64 tree_root_gen;
-
- __u64 chunk_root;
- __u64 chunk_root_gen;
-
- __u64 extent_root;
- __u64 extent_root_gen;
-
- __u64 fs_root;
- __u64 fs_root_gen;
-
- __u64 dev_root;
- __u64 dev_root_gen;
-
- __u64 csum_root;
- __u64 csum_root_gen;
-
- __u64 total_bytes;
- __u64 bytes_used;
- __u64 num_devices;
- /* future */
- __u64 unused_64[4];
-
- __u8 tree_root_level;
- __u8 chunk_root_level;
- __u8 extent_root_level;
- __u8 fs_root_level;
- __u8 dev_root_level;
- __u8 csum_root_level;
- /* future and to align */
- __u8 unused_8[10];
-} __attribute__ ((__packed__));
-
-/*
- * the super block basically lists the main trees of the FS
- * it currently lacks any block count etc etc
- */
-struct btrfs_super_block {
- __u8 csum[BTRFS_CSUM_SIZE];
- /* the first 4 fields must match struct btrfs_header */
- __u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- __u64 bytenr; /* this block number */
- __u64 flags;
-
- /* allowed to be different from the btrfs_header from here own down */
- __u64 magic;
- __u64 generation;
- __u64 root;
- __u64 chunk_root;
- __u64 log_root;
-
- /* this will help find the new super based on the log root */
- __u64 log_root_transid;
- __u64 total_bytes;
- __u64 bytes_used;
- __u64 root_dir_objectid;
- __u64 num_devices;
- __u32 sectorsize;
- __u32 nodesize;
- __u32 __unused_leafsize;
- __u32 stripesize;
- __u32 sys_chunk_array_size;
- __u64 chunk_root_generation;
- __u64 compat_flags;
- __u64 compat_ro_flags;
- __u64 incompat_flags;
- __u16 csum_type;
- __u8 root_level;
- __u8 chunk_root_level;
- __u8 log_root_level;
- struct btrfs_dev_item dev_item;
-
- char label[BTRFS_LABEL_SIZE];
-
- __u64 cache_generation;
- __u64 uuid_tree_generation;
-
- /* future expansion */
- __u64 reserved[30];
- __u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
- struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
-} __attribute__ ((__packed__));
-
-/*
- * Compat flags that we support. If any incompat flags are set other than the
- * ones specified below then we will fail to mount
- */
-#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
-#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
-#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
-
-#define BTRFS_FEATURE_COMPAT_RO_SUPP \
- (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
- BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
-
-#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
-#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
-
-#define BTRFS_FEATURE_INCOMPAT_SUPP \
- (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
- BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
- BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
- BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
- BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
- BTRFS_FEATURE_INCOMPAT_RAID56 | \
- BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
- BTRFS_FEATURE_INCOMPAT_NO_HOLES)
-
-#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
- (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
-#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
-
-/*
- * A leaf is full of items. offset and size tell us where to find
- * the item in the leaf (relative to the start of the data area)
- */
-struct btrfs_item {
- struct btrfs_key key;
- __u32 offset;
- __u32 size;
-} __attribute__ ((__packed__));
-
-/*
- * leaves have an item area and a data area:
- * [item0, item1....itemN] [free space] [dataN...data1, data0]
- *
- * The data is separate from the items to get the keys closer together
- * during searches.
- */
-struct btrfs_leaf {
- struct btrfs_header header;
- struct btrfs_item items[];
-} __attribute__ ((__packed__));
-
-/*
- * all non-leaf blocks are nodes, they hold only keys and pointers to
- * other blocks
- */
-struct btrfs_key_ptr {
- struct btrfs_key key;
- __u64 blockptr;
- __u64 generation;
-} __attribute__ ((__packed__));
-
-struct btrfs_node {
- struct btrfs_header header;
- struct btrfs_key_ptr ptrs[];
-} __attribute__ ((__packed__));
-
union btrfs_tree_node {
struct btrfs_header header;
struct btrfs_leaf leaf;
struct btrfs_node node;
};
-typedef __u8 u8;
-typedef __u16 u16;
-typedef __u32 u32;
-typedef __u64 u64;
-
struct btrfs_path {
union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
u32 slots[BTRFS_MAX_LEVEL];
@@ -283,7 +74,8 @@ int btrfs_prev_slot(struct btrfs_path *);
int btrfs_next_slot(struct btrfs_path *);
static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
- return &p->nodes[0]->leaf.items[p->slots[0]].key;
+ /* At tree read time we have converted the endian for btrfs_disk_key */
+ return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
}
static inline struct btrfs_key *
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 991c2f68c3b7..d88ae67217b1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -29,7 +29,7 @@ u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
*refp = *ref;
if (name) {
- if (ref->name_len > BTRFS_NAME_MAX) {
+ if (ref->name_len > BTRFS_NAME_LEN) {
printf("%s: inode name too long: %u\n", __func__,
ref->name_len);
goto out;
@@ -255,7 +255,8 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
type = item.type;
have_inode = 1;
- if (btrfs_lookup_inode(root, &item.location, &inode_item, root))
+ if (btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
+ &inode_item, root))
return -1ULL;
if (item.type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
diff --git a/fs/btrfs/kernel-shared/btrfs_tree.h b/fs/btrfs/kernel-shared/btrfs_tree.h
new file mode 100644
index 000000000000..7d245f900104
--- /dev/null
+++ b/fs/btrfs/kernel-shared/btrfs_tree.h
@@ -0,0 +1,1333 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copied from kernel/include/uapi/linux/btrfs_btree.h.
+ *
+ * Only modified the header.
+ */
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __BTRFS_TREE_H__
+#define __BTRFS_TREE_H__
+
+#include <linux/types.h>
+
+#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
+
+/*
+ * The max metadata block size (node size).
+ *
+ * This limit is somewhat artificial. The memmove and tree block locking cost
+ * go up with larger node size.
+ */
+#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
+
+/*
+ * We can actually store much bigger names, but lets not confuse the rest
+ * of linux.
+ *
+ * btrfs_dir_item::name_len follows this limitation.
+ */
+#define BTRFS_NAME_LEN 255
+
+/*
+ * Objectids start from here.
+ *
+ * Check btrfs_disk_key for the meaning of objectids.
+ */
+
+/*
+ * Root tree holds pointers to all of the tree roots.
+ * Without special mention, the root tree contains the root bytenr of all other
+ * trees, except the chunk tree and the log tree.
+ *
+ * The super block contains the root bytenr of this tree.
+ */
+#define BTRFS_ROOT_TREE_OBJECTID 1ULL
+
+/*
+ * Extent tree stores information about which extents are in use, and backrefs
+ * for each extent.
+ */
+#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
+
+/*
+ * Chunk tree stores btrfs logical address -> physical address mapping.
+ *
+ * The super block contains part of chunk tree for bootstrap, and contains
+ * the root bytenr of this tree.
+ */
+#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
+
+/*
+ * Device tree stores info about which areas of a given device are in use,
+ * and physical address -> btrfs logical address mapping.
+ */
+#define BTRFS_DEV_TREE_OBJECTID 4ULL
+
+/* The fs tree is the first subvolume tree, storing files and directories. */
+#define BTRFS_FS_TREE_OBJECTID 5ULL
+
+/* Shows the directory objectid inside the root tree. */
+#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
+
+/* Csum tree holds checksums of all the data extents. */
+#define BTRFS_CSUM_TREE_OBJECTID 7ULL
+
+/* Quota tree holds quota configuration and tracking. */
+#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
+
+/* UUID tree stores items that use the BTRFS_UUID_KEY* types. */
+#define BTRFS_UUID_TREE_OBJECTID 9ULL
+
+/* Free space cache tree (v2 space cache) tracks free space in block groups. */
+#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
+
+/* Indicates device stats in the device tree. */
+#define BTRFS_DEV_STATS_OBJECTID 0ULL
+
+/* For storing balance parameters in the root tree. */
+#define BTRFS_BALANCE_OBJECTID -4ULL
+
+/* Orhpan objectid for tracking unlinked/truncated files. */
+#define BTRFS_ORPHAN_OBJECTID -5ULL
+
+/* Does write ahead logging to speed up fsyncs. */
+#define BTRFS_TREE_LOG_OBJECTID -6ULL
+#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
+
+/* For space balancing. */
+#define BTRFS_TREE_RELOC_OBJECTID -8ULL
+#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
+
+/* Extent checksums, shared between the csum tree and log trees. */
+#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
+
+/* For storing free space cache (v1 space cache). */
+#define BTRFS_FREE_SPACE_OBJECTID -11ULL
+
+/* The inode number assigned to the special inode for storing free ino cache. */
+#define BTRFS_FREE_INO_OBJECTID -12ULL
+
+/* Dummy objectid represents multiple objectids. */
+#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
+
+/* All files have objectids in this range. */
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#define BTRFS_LAST_FREE_OBJECTID -256ULL
+#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
+
+
+/*
+ * The device items go into the chunk tree.
+ *
+ * The key is in the form
+ * (BTRFS_DEV_ITEMS_OBJECTID, BTRFS_DEV_ITEM_KEY, <device_id>)
+ */
+#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
+
+#define BTRFS_BTREE_INODE_OBJECTID 1
+
+#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
+
+#define BTRFS_DEV_REPLACE_DEVID 0ULL
+
+/*
+ * Types start from here.
+ *
+ * Check btrfs_disk_key for details about types.
+ */
+
+/*
+ * Inode items have the data typically returned from stat and store other
+ * info about object characteristics.
+ *
+ * There is one for every file and dir in the FS.
+ */
+#define BTRFS_INODE_ITEM_KEY 1
+/* reserve 2-11 close to the inode for later flexibility */
+#define BTRFS_INODE_REF_KEY 12
+#define BTRFS_INODE_EXTREF_KEY 13
+#define BTRFS_XATTR_ITEM_KEY 24
+#define BTRFS_ORPHAN_ITEM_KEY 48
+
+/*
+ * Dir items are the name -> inode pointers in a directory.
+ *
+ * There is one for every name in a directory.
+ */
+#define BTRFS_DIR_LOG_ITEM_KEY 60
+#define BTRFS_DIR_LOG_INDEX_KEY 72
+#define BTRFS_DIR_ITEM_KEY 84
+#define BTRFS_DIR_INDEX_KEY 96
+
+/* Stores info (position, size ...) about a data extent of a file */
+#define BTRFS_EXTENT_DATA_KEY 108
+
+/*
+ * Extent csums are stored in a separate tree and hold csums for
+ * an entire extent on disk.
+ */
+#define BTRFS_EXTENT_CSUM_KEY 128
+
+/*
+ * Root items point to tree roots.
+ *
+ * They are typically in the root tree used by the super block to find all the
+ * other trees.
+ */
+#define BTRFS_ROOT_ITEM_KEY 132
+
+/*
+ * Root backrefs tie subvols and snapshots to the directory entries that
+ * reference them.
+ */
+#define BTRFS_ROOT_BACKREF_KEY 144
+
+/*
+ * Root refs make a fast index for listing all of the snapshots and
+ * subvolumes referenced by a given root. They point directly to the
+ * directory item in the root that references the subvol.
+ */
+#define BTRFS_ROOT_REF_KEY 156
+
+/*
+ * Extent items are in the extent tree.
+ *
+ * These record which blocks are used, and how many references there are.
+ */
+#define BTRFS_EXTENT_ITEM_KEY 168
+
+/*
+ * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
+ * the length, so we save the level in key->offset instead of the length.
+ */
+#define BTRFS_METADATA_ITEM_KEY 169
+
+#define BTRFS_TREE_BLOCK_REF_KEY 176
+
+#define BTRFS_EXTENT_DATA_REF_KEY 178
+
+#define BTRFS_EXTENT_REF_V0_KEY 180
+
+#define BTRFS_SHARED_BLOCK_REF_KEY 182
+
+#define BTRFS_SHARED_DATA_REF_KEY 184
+
+/*
+ * Block groups give us hints into the extent allocation trees.
+ *
+ * Stores how many free space there is in a block group.
+ */
+#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
+
+/*
+ * Every block group is represented in the free space tree by a free space info
+ * item, which stores some accounting information. It is keyed on
+ * (block_group_start, FREE_SPACE_INFO, block_group_length).
+ */
+#define BTRFS_FREE_SPACE_INFO_KEY 198
+
+/*
+ * A free space extent tracks an extent of space that is free in a block group.
+ * It is keyed on (start, FREE_SPACE_EXTENT, length).
+ */
+#define BTRFS_FREE_SPACE_EXTENT_KEY 199
+
+/*
+ * When a block group becomes very fragmented, we convert it to use bitmaps
+ * instead of extents.
+ *
+ * A free space bitmap is keyed on (start, FREE_SPACE_BITMAP, length).
+ * The corresponding item is a bitmap with (length / sectorsize) bits.
+ */
+#define BTRFS_FREE_SPACE_BITMAP_KEY 200
+
+#define BTRFS_DEV_EXTENT_KEY 204
+#define BTRFS_DEV_ITEM_KEY 216
+#define BTRFS_CHUNK_ITEM_KEY 228
+
+/*
+ * Records the overall state of the qgroups.
+ *
+ * There's only one instance of this key present,
+ * (0, BTRFS_QGROUP_STATUS_KEY, 0)
+ */
+#define BTRFS_QGROUP_STATUS_KEY 240
+/*
+ * Records the currently used space of the qgroup.
+ *
+ * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
+ */
+#define BTRFS_QGROUP_INFO_KEY 242
+
+/*
+ * Contains the user configured limits for the qgroup.
+ *
+ * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
+ */
+#define BTRFS_QGROUP_LIMIT_KEY 244
+
+/*
+ * Records the child-parent relationship of qgroups. For
+ * each relation, 2 keys are present:
+ * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
+ * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
+ */
+#define BTRFS_QGROUP_RELATION_KEY 246
+
+/* Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY. */
+#define BTRFS_BALANCE_ITEM_KEY 248
+
+/*
+ * The key type for tree items that are stored persistently, but do not need to
+ * exist for extended period of time. The items can exist in any tree.
+ *
+ * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
+ *
+ * Existing items:
+ *
+ * - balance status item
+ * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
+ */
+#define BTRFS_TEMPORARY_ITEM_KEY 248
+
+/* Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY */
+#define BTRFS_DEV_STATS_KEY 249
+
+/*
+ * The key type for tree items that are stored persistently and usually exist
+ * for a long period, eg. filesystem lifetime. The item kinds can be status
+ * information, stats or preference values. The item can exist in any tree.
+ *
+ * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
+ *
+ * Existing items:
+ *
+ * - device statistics, store IO stats in the device tree, one key for all
+ * stats
+ * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
+ */
+#define BTRFS_PERSISTENT_ITEM_KEY 249
+
+/*
+ * Persistently stores the device replace state in the device tree.
+ *
+ * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
+ */
+#define BTRFS_DEV_REPLACE_KEY 250
+
+/*
+ * Stores items that allow to quickly map UUIDs to something else.
+ *
+ * These items are part of the filesystem UUID tree.
+ * The key is built like this:
+ * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
+ */
+#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
+#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
+ * received subvols */
+
+/*
+ * String items are for debugging.
+ *
+ * They just store a short string of data in the FS.
+ */
+#define BTRFS_STRING_ITEM_KEY 253
+
+
+
+/* 32 bytes in various csum fields */
+#define BTRFS_CSUM_SIZE 32
+
+/* Csum types */
+enum btrfs_csum_type {
+ BTRFS_CSUM_TYPE_CRC32 = 0,
+ BTRFS_CSUM_TYPE_XXHASH = 1,
+ BTRFS_CSUM_TYPE_SHA256 = 2,
+ BTRFS_CSUM_TYPE_BLAKE2 = 3,
+};
+
+/*
+ * Flags definitions for directory entry item type.
+ *
+ * Used by:
+ * struct btrfs_dir_item.type
+ *
+ * Values 0..7 must match common file type values in fs_types.h.
+ */
+#define BTRFS_FT_UNKNOWN 0
+#define BTRFS_FT_REG_FILE 1
+#define BTRFS_FT_DIR 2
+#define BTRFS_FT_CHRDEV 3
+#define BTRFS_FT_BLKDEV 4
+#define BTRFS_FT_FIFO 5
+#define BTRFS_FT_SOCK 6
+#define BTRFS_FT_SYMLINK 7
+#define BTRFS_FT_XATTR 8
+#define BTRFS_FT_MAX 9
+
+#define BTRFS_FSID_SIZE 16
+#define BTRFS_UUID_SIZE 16
+
+/*
+ * The key defines the order in the tree, and so it also defines (optimal)
+ * block layout.
+ *
+ * Objectid and offset are interpreted based on type.
+ * While normally for objectid, it either represents a root number, or an
+ * inode number.
+ *
+ * Type tells us things about the object, and is a kind of stream selector.
+ * Check the following URL for full references about btrfs_disk_key/btrfs_key:
+ * https://btrfs.wiki.kernel.org/index.php/Btree_Items
+ *
+ * btrfs_disk_key is in disk byte order. struct btrfs_key is always
+ * in cpu native order. Otherwise they are identical and their sizes
+ * should be the same (ie both packed)
+ */
+struct btrfs_disk_key {
+ __le64 objectid;
+ __u8 type;
+ __le64 offset;
+} __attribute__ ((__packed__));
+
+struct btrfs_key {
+ __u64 objectid;
+ __u8 type;
+ __u64 offset;
+} __attribute__ ((__packed__));
+
+struct btrfs_dev_item {
+ /* The internal btrfs device id */
+ __le64 devid;
+
+ /* Size of the device */
+ __le64 total_bytes;
+
+ /* Bytes used */
+ __le64 bytes_used;
+
+ /* Optimal io alignment for this device */
+ __le32 io_align;
+
+ /* Optimal io width for this device */
+ __le32 io_width;
+
+ /* Minimal io size for this device */
+ __le32 sector_size;
+
+ /* Type and info about this device */
+ __le64 type;
+
+ /* Expected generation for this device */
+ __le64 generation;
+
+ /*
+ * Starting byte of this partition on the device,
+ * to allow for stripe alignment in the future.
+ */
+ __le64 start_offset;
+
+ /* Grouping information for allocation decisions */
+ __le32 dev_group;
+
+ /* Optimal seek speed 0-100 where 100 is fastest */
+ __u8 seek_speed;
+
+ /* Optimal bandwidth 0-100 where 100 is fastest */
+ __u8 bandwidth;
+
+ /* Btrfs generated uuid for this device */
+ __u8 uuid[BTRFS_UUID_SIZE];
+
+ /* UUID of FS who owns this device */
+ __u8 fsid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_stripe {
+ __le64 devid;
+ __le64 offset;
+ __u8 dev_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_chunk {
+ /* Size of this chunk in bytes */
+ __le64 length;
+
+ /* Objectid of the root referencing this chunk */
+ __le64 owner;
+
+ __le64 stripe_len;
+ __le64 type;
+
+ /* Optimal io alignment for this chunk */
+ __le32 io_align;
+
+ /* Optimal io width for this chunk */
+ __le32 io_width;
+
+ /* Minimal io size for this chunk */
+ __le32 sector_size;
+
+ /*
+ * 2^16 stripes is quite a lot, a second limit is the size of a single
+ * item in the btree.
+ */
+ __le16 num_stripes;
+
+ /* Sub stripes only matter for raid10 */
+ __le16 sub_stripes;
+ struct btrfs_stripe stripe;
+ /* additional stripes go here */
+} __attribute__ ((__packed__));
+
+#define BTRFS_FREE_SPACE_EXTENT 1
+#define BTRFS_FREE_SPACE_BITMAP 2
+
+struct btrfs_free_space_entry {
+ __le64 offset;
+ __le64 bytes;
+ __u8 type;
+} __attribute__ ((__packed__));
+
+struct btrfs_free_space_header {
+ struct btrfs_disk_key location;
+ __le64 generation;
+ __le64 num_entries;
+ __le64 num_bitmaps;
+} __attribute__ ((__packed__));
+
+#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
+#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
+
+/* Super block flags */
+/* Errors detected */
+#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
+
+#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
+#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
+#define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
+#define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
+#define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36)
+
+
+/*
+ * Items in the extent tree are used to record the objectid of the
+ * owner of the block and the number of references.
+ */
+struct btrfs_extent_item {
+ __le64 refs;
+ __le64 generation;
+ __le64 flags;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_item_v0 {
+ __le32 refs;
+} __attribute__ ((__packed__));
+
+
+#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
+#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
+
+/* Use full backrefs for extent pointers in the block */
+#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
+
+/*
+ * This flag is only used internally by scrub and may be changed at any time
+ * it is only declared here to avoid collisions.
+ */
+#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
+
+struct btrfs_tree_block_info {
+ struct btrfs_disk_key key;
+ __u8 level;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_data_ref {
+ __le64 root;
+ __le64 objectid;
+ __le64 offset;
+ __le32 count;
+} __attribute__ ((__packed__));
+
+struct btrfs_shared_data_ref {
+ __le32 count;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_inline_ref {
+ __u8 type;
+ __le64 offset;
+} __attribute__ ((__packed__));
+
+/* Old style backrefs item */
+struct btrfs_extent_ref_v0 {
+ __le64 root;
+ __le64 generation;
+ __le64 objectid;
+ __le32 count;
+} __attribute__ ((__packed__));
+
+
+/* Dev extents record used space on individual devices.
+ *
+ * The owner field points back to the chunk allocation mapping tree that
+ * allocated the extent.
+ * The chunk tree uuid field is a way to double check the owner.
+ */
+struct btrfs_dev_extent {
+ __le64 chunk_tree;
+ __le64 chunk_objectid;
+ __le64 chunk_offset;
+ __le64 length;
+ __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_ref {
+ __le64 index;
+ __le16 name_len;
+ /* Name goes here */
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_extref {
+ __le64 parent_objectid;
+ __le64 index;
+ __le16 name_len;
+ __u8 name[0];
+ /* Name goes here */
+} __attribute__ ((__packed__));
+
+struct btrfs_timespec {
+ __le64 sec;
+ __le32 nsec;
+} __attribute__ ((__packed__));
+
+/* Inode flags */
+#define BTRFS_INODE_NODATASUM (1 << 0)
+#define BTRFS_INODE_NODATACOW (1 << 1)
+#define BTRFS_INODE_READONLY (1 << 2)
+#define BTRFS_INODE_NOCOMPRESS (1 << 3)
+#define BTRFS_INODE_PREALLOC (1 << 4)
+#define BTRFS_INODE_SYNC (1 << 5)
+#define BTRFS_INODE_IMMUTABLE (1 << 6)
+#define BTRFS_INODE_APPEND (1 << 7)
+#define BTRFS_INODE_NODUMP (1 << 8)
+#define BTRFS_INODE_NOATIME (1 << 9)
+#define BTRFS_INODE_DIRSYNC (1 << 10)
+#define BTRFS_INODE_COMPRESS (1 << 11)
+
+#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
+
+#define BTRFS_INODE_FLAG_MASK \
+ (BTRFS_INODE_NODATASUM | \
+ BTRFS_INODE_NODATACOW | \
+ BTRFS_INODE_READONLY | \
+ BTRFS_INODE_NOCOMPRESS | \
+ BTRFS_INODE_PREALLOC | \
+ BTRFS_INODE_SYNC | \
+ BTRFS_INODE_IMMUTABLE | \
+ BTRFS_INODE_APPEND | \
+ BTRFS_INODE_NODUMP | \
+ BTRFS_INODE_NOATIME | \
+ BTRFS_INODE_DIRSYNC | \
+ BTRFS_INODE_COMPRESS | \
+ BTRFS_INODE_ROOT_ITEM_INIT)
+
+struct btrfs_inode_item {
+ /* Nfs style generation number */
+ __le64 generation;
+ /* Transid that last touched this inode */
+ __le64 transid;
+ __le64 size;
+ __le64 nbytes;
+ __le64 block_group;
+ __le32 nlink;
+ __le32 uid;
+ __le32 gid;
+ __le32 mode;
+ __le64 rdev;
+ __le64 flags;
+
+ /* Modification sequence number for NFS */
+ __le64 sequence;
+
+ /*
+ * A little future expansion, for more than this we can just grow the
+ * inode item and version it
+ */
+ __le64 reserved[4];
+ struct btrfs_timespec atime;
+ struct btrfs_timespec ctime;
+ struct btrfs_timespec mtime;
+ struct btrfs_timespec otime;
+} __attribute__ ((__packed__));
+
+struct btrfs_dir_log_item {
+ __le64 end;
+} __attribute__ ((__packed__));
+
+struct btrfs_dir_item {
+ struct btrfs_disk_key location;
+ __le64 transid;
+ __le16 data_len;
+ __le16 name_len;
+ __u8 type;
+} __attribute__ ((__packed__));
+
+#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
+
+/*
+ * Internal in-memory flag that a subvolume has been marked for deletion but
+ * still visible as a directory
+ */
+#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
+
+struct btrfs_root_item {
+ struct btrfs_inode_item inode;
+ __le64 generation;
+ __le64 root_dirid;
+ __le64 bytenr;
+ __le64 byte_limit;
+ __le64 bytes_used;
+ __le64 last_snapshot;
+ __le64 flags;
+ __le32 refs;
+ struct btrfs_disk_key drop_progress;
+ __u8 drop_level;
+ __u8 level;
+
+ /*
+ * The following fields appear after subvol_uuids+subvol_times
+ * were introduced.
+ */
+
+ /*
+ * This generation number is used to test if the new fields are valid
+ * and up to date while reading the root item. Every time the root item
+ * is written out, the "generation" field is copied into this field. If
+ * anyone ever mounted the fs with an older kernel, we will have
+ * mismatching generation values here and thus must invalidate the
+ * new fields. See btrfs_update_root and btrfs_find_last_root for
+ * details.
+ * The offset of generation_v2 is also used as the start for the memset
+ * when invalidating the fields.
+ */
+ __le64 generation_v2;
+ __u8 uuid[BTRFS_UUID_SIZE];
+ __u8 parent_uuid[BTRFS_UUID_SIZE];
+ __u8 received_uuid[BTRFS_UUID_SIZE];
+ __le64 ctransid; /* Updated when an inode changes */
+ __le64 otransid; /* Trans when created */
+ __le64 stransid; /* Trans when sent. Non-zero for received subvol. */
+ __le64 rtransid; /* Trans when received. Non-zero for received subvol.*/
+ struct btrfs_timespec ctime;
+ struct btrfs_timespec otime;
+ struct btrfs_timespec stime;
+ struct btrfs_timespec rtime;
+ __le64 reserved[8]; /* For future */
+} __attribute__ ((__packed__));
+
+/* This is used for both forward and backward root refs */
+struct btrfs_root_ref {
+ __le64 dirid;
+ __le64 sequence;
+ __le16 name_len;
+} __attribute__ ((__packed__));
+
+struct btrfs_disk_balance_args {
+ /*
+ * Profiles to operate on.
+ *
+ * SINGLE is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE.
+ */
+ __le64 profiles;
+
+ /*
+ * Usage filter
+ * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
+ * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
+ */
+ union {
+ __le64 usage;
+ struct {
+ __le32 usage_min;
+ __le32 usage_max;
+ };
+ };
+
+ /* Devid filter */
+ __le64 devid;
+
+ /* Devid subset filter [pstart..pend) */
+ __le64 pstart;
+ __le64 pend;
+
+ /* Btrfs virtual address space subset filter [vstart..vend) */
+ __le64 vstart;
+ __le64 vend;
+
+ /*
+ * Profile to convert to.
+ *
+ * SINGLE is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE.
+ */
+ __le64 target;
+
+ /* BTRFS_BALANCE_ARGS_* */
+ __le64 flags;
+
+ /*
+ * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'.
+ * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
+ * and maximum.
+ */
+ union {
+ __le64 limit;
+ struct {
+ __le32 limit_min;
+ __le32 limit_max;
+ };
+ };
+
+ /*
+ * Process chunks that cross stripes_min..stripes_max devices,
+ * BTRFS_BALANCE_ARGS_STRIPES_RANGE.
+ */
+ __le32 stripes_min;
+ __le32 stripes_max;
+
+ __le64 unused[6];
+} __attribute__ ((__packed__));
+
+/*
+ * Stores balance parameters to disk so that balance can be properly
+ * resumed after crash or unmount.
+ */
+struct btrfs_balance_item {
+ /* BTRFS_BALANCE_* */
+ __le64 flags;
+
+ struct btrfs_disk_balance_args data;
+ struct btrfs_disk_balance_args meta;
+ struct btrfs_disk_balance_args sys;
+
+ __le64 unused[4];
+} __attribute__ ((__packed__));
+
+enum {
+ BTRFS_FILE_EXTENT_INLINE = 0,
+ BTRFS_FILE_EXTENT_REG = 1,
+ BTRFS_FILE_EXTENT_PREALLOC = 2,
+ BTRFS_NR_FILE_EXTENT_TYPES = 3,
+};
+
+enum btrfs_compression_type {
+ BTRFS_COMPRESS_NONE = 0,
+ BTRFS_COMPRESS_ZLIB = 1,
+ BTRFS_COMPRESS_LZO = 2,
+ BTRFS_COMPRESS_ZSTD = 3,
+ BTRFS_NR_COMPRESS_TYPES = 4,
+};
+
+struct btrfs_file_extent_item {
+ /* Transaction id that created this extent */
+ __le64 generation;
+ /*
+ * Max number of bytes to hold this extent in ram.
+ *
+ * When we split a compressed extent we can't know how big each of the
+ * resulting pieces will be. So, this is an upper limit on the size of
+ * the extent in ram instead of an exact limit.
+ */
+ __le64 ram_bytes;
+
+ /*
+ * 32 bits for the various ways we might encode the data,
+ * including compression and encryption. If any of these
+ * are set to something a given disk format doesn't understand
+ * it is treated like an incompat flag for reading and writing,
+ * but not for stat.
+ */
+ __u8 compression;
+ __u8 encryption;
+ __le16 other_encoding; /* Spare for later use */
+
+ /* Are we inline data or a real extent? */
+ __u8 type;
+
+ /*
+ * Disk space consumed by the extent, checksum blocks are not included
+ * in these numbers
+ *
+ * At this offset in the structure, the inline extent data start.
+ */
+ __le64 disk_bytenr;
+ __le64 disk_num_bytes;
+
+ /*
+ * The logical offset inside the file extent.
+ *
+ * This allows a file extent to point into the middle of an existing
+ * extent on disk, sharing it between two snapshots (useful if some
+ * bytes in the middle of the extent have changed).
+ */
+ __le64 offset;
+
+ /*
+ * The logical number of bytes this file extent is referencing (no
+ * csums included).
+ *
+ * This always reflects the size uncompressed and without encoding.
+ */
+ __le64 num_bytes;
+
+} __attribute__ ((__packed__));
+
+struct btrfs_csum_item {
+ __u8 csum;
+} __attribute__ ((__packed__));
+
+enum btrfs_dev_stat_values {
+ /* Disk I/O failure stats */
+ BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
+ BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
+ BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
+
+ /* Stats for indirect indications for I/O failures */
+ BTRFS_DEV_STAT_CORRUPTION_ERRS, /* Checksum error, bytenr error or
+ * contents is illegal: this is an
+ * indication that the block was damaged
+ * during read or write, or written to
+ * wrong location or read from wrong
+ * location */
+ BTRFS_DEV_STAT_GENERATION_ERRS, /* An indication that blocks have not
+ * been written */
+
+ BTRFS_DEV_STAT_VALUES_MAX
+};
+
+struct btrfs_dev_stats_item {
+ /*
+ * Grow this item struct at the end for future enhancements and keep
+ * the existing values unchanged.
+ */
+ __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
+} __attribute__ ((__packed__));
+
+#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
+#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
+
+struct btrfs_dev_replace_item {
+ /*
+ * Grow this item struct at the end for future enhancements and keep
+ * the existing values unchanged.
+ */
+ __le64 src_devid;
+ __le64 cursor_left;
+ __le64 cursor_right;
+ __le64 cont_reading_from_srcdev_mode;
+
+ __le64 replace_state;
+ __le64 time_started;
+ __le64 time_stopped;
+ __le64 num_write_errors;
+ __le64 num_uncorrectable_read_errors;
+} __attribute__ ((__packed__));
+
+/* Different types of block groups (and chunks) */
+#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
+#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
+#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
+#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
+#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
+#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
+#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
+#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
+#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
+#define BTRFS_BLOCK_GROUP_RAID1C3 (1ULL << 9)
+#define BTRFS_BLOCK_GROUP_RAID1C4 (1ULL << 10)
+#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
+ BTRFS_SPACE_INFO_GLOBAL_RSV)
+
+enum btrfs_raid_types {
+ BTRFS_RAID_RAID10,
+ BTRFS_RAID_RAID1,
+ BTRFS_RAID_DUP,
+ BTRFS_RAID_RAID0,
+ BTRFS_RAID_SINGLE,
+ BTRFS_RAID_RAID5,
+ BTRFS_RAID_RAID6,
+ BTRFS_RAID_RAID1C3,
+ BTRFS_RAID_RAID1C4,
+ BTRFS_NR_RAID_TYPES
+};
+
+#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
+ BTRFS_BLOCK_GROUP_SYSTEM | \
+ BTRFS_BLOCK_GROUP_METADATA)
+
+#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
+ BTRFS_BLOCK_GROUP_RAID1 | \
+ BTRFS_BLOCK_GROUP_RAID1C3 | \
+ BTRFS_BLOCK_GROUP_RAID1C4 | \
+ BTRFS_BLOCK_GROUP_RAID5 | \
+ BTRFS_BLOCK_GROUP_RAID6 | \
+ BTRFS_BLOCK_GROUP_DUP | \
+ BTRFS_BLOCK_GROUP_RAID10)
+#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
+ BTRFS_BLOCK_GROUP_RAID6)
+
+#define BTRFS_BLOCK_GROUP_RAID1_MASK (BTRFS_BLOCK_GROUP_RAID1 | \
+ BTRFS_BLOCK_GROUP_RAID1C3 | \
+ BTRFS_BLOCK_GROUP_RAID1C4)
+
+/*
+ * We need a bit for restriper to be able to tell when chunks of type
+ * SINGLE are available. This "extended" profile format is used in
+ * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
+ * (on-disk). The corresponding on-disk bit in chunk.type is reserved
+ * to avoid remappings between two formats in future.
+ */
+#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
+
+/*
+ * A fake block group type that is used to communicate global block reserve
+ * size to userspace via the SPACE_INFO ioctl.
+ */
+#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
+
+#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
+ BTRFS_AVAIL_ALLOC_BIT_SINGLE)
+
+static inline __u64 chunk_to_extended(__u64 flags)
+{
+ if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
+ flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ return flags;
+}
+static inline __u64 extended_to_chunk(__u64 flags)
+{
+ return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+}
+
+struct btrfs_block_group_item {
+ __le64 used;
+ __le64 chunk_objectid;
+ __le64 flags;
+} __attribute__ ((__packed__));
+
+struct btrfs_free_space_info {
+ __le32 extent_count;
+ __le32 flags;
+} __attribute__ ((__packed__));
+
+#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
+
+#define BTRFS_QGROUP_LEVEL_SHIFT 48
+static inline __u64 btrfs_qgroup_level(__u64 qgroupid)
+{
+ return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
+}
+
+/* Is subvolume quota turned on? */
+#define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
+
+/* Is qgroup rescan running? */
+#define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
+
+/*
+ * Some qgroup entries are known to be out of date, either because the
+ * configuration has changed in a way that makes a rescan necessary, or
+ * because the fs has been mounted with a non-qgroup-aware version.
+ */
+#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
+
+#define BTRFS_QGROUP_STATUS_VERSION 1
+
+struct btrfs_qgroup_status_item {
+ __le64 version;
+ /*
+ * The generation is updated during every commit. As older
+ * versions of btrfs are not aware of qgroups, it will be
+ * possible to detect inconsistencies by checking the
+ * generation on mount time.
+ */
+ __le64 generation;
+
+ /* Flag definitions see above */
+ __le64 flags;
+
+ /*
+ * Only used during scanning to record the progress of the scan.
+ * It contains a logical address.
+ */
+ __le64 rescan;
+} __attribute__ ((__packed__));
+
+struct btrfs_qgroup_info_item {
+ __le64 generation;
+ __le64 rfer;
+ __le64 rfer_cmpr;
+ __le64 excl;
+ __le64 excl_cmpr;
+} __attribute__ ((__packed__));
+
+/*
+ * Flags definition for qgroup limits
+ *
+ * Used by:
+ * struct btrfs_qgroup_limit.flags
+ * struct btrfs_qgroup_limit_item.flags
+ */
+#define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
+#define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
+#define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
+#define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
+#define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
+#define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
+
+struct btrfs_qgroup_limit_item {
+ /* Only updated when any of the other values change. */
+ __le64 flags;
+ __le64 max_rfer;
+ __le64 max_excl;
+ __le64 rsv_rfer;
+ __le64 rsv_excl;
+} __attribute__ ((__packed__));
+
+/*
+ * Just in case we somehow lose the roots and are not able to mount,
+ * we store an array of the roots from previous transactions in the super.
+ */
+#define BTRFS_NUM_BACKUP_ROOTS 4
+struct btrfs_root_backup {
+ __le64 tree_root;
+ __le64 tree_root_gen;
+
+ __le64 chunk_root;
+ __le64 chunk_root_gen;
+
+ __le64 extent_root;
+ __le64 extent_root_gen;
+
+ __le64 fs_root;
+ __le64 fs_root_gen;
+
+ __le64 dev_root;
+ __le64 dev_root_gen;
+
+ __le64 csum_root;
+ __le64 csum_root_gen;
+
+ __le64 total_bytes;
+ __le64 bytes_used;
+ __le64 num_devices;
+ /* future */
+ __le64 unused_64[4];
+
+ u8 tree_root_level;
+ u8 chunk_root_level;
+ u8 extent_root_level;
+ u8 fs_root_level;
+ u8 dev_root_level;
+ u8 csum_root_level;
+ /* future and to align */
+ u8 unused_8[10];
+} __attribute__ ((__packed__));
+
+/*
+ * This is a very generous portion of the super block, giving us room to
+ * translate 14 chunks with 3 stripes each.
+ */
+#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
+
+#define BTRFS_LABEL_SIZE 256
+
+/* The super block basically lists the main trees of the FS. */
+struct btrfs_super_block {
+ /* The first 4 fields must match struct btrfs_header */
+ u8 csum[BTRFS_CSUM_SIZE];
+ /* FS specific UUID, visible to user */
+ u8 fsid[BTRFS_FSID_SIZE];
+ __le64 bytenr; /* this block number */
+ __le64 flags;
+
+ /* Allowed to be different from the btrfs_header from here own down. */
+ __le64 magic;
+ __le64 generation;
+ __le64 root;
+ __le64 chunk_root;
+ __le64 log_root;
+
+ /* This will help find the new super based on the log root. */
+ __le64 log_root_transid;
+ __le64 total_bytes;
+ __le64 bytes_used;
+ __le64 root_dir_objectid;
+ __le64 num_devices;
+ __le32 sectorsize;
+ __le32 nodesize;
+ __le32 __unused_leafsize;
+ __le32 stripesize;
+ __le32 sys_chunk_array_size;
+ __le64 chunk_root_generation;
+ __le64 compat_flags;
+ __le64 compat_ro_flags;
+ __le64 incompat_flags;
+ __le16 csum_type;
+ u8 root_level;
+ u8 chunk_root_level;
+ u8 log_root_level;
+ struct btrfs_dev_item dev_item;
+
+ char label[BTRFS_LABEL_SIZE];
+
+ __le64 cache_generation;
+ __le64 uuid_tree_generation;
+
+ /* The UUID written into btree blocks */
+ u8 metadata_uuid[BTRFS_FSID_SIZE];
+
+ /* Future expansion */
+ __le64 reserved[28];
+ u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
+ struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
+} __attribute__ ((__packed__));
+
+/*
+ * Feature flags
+ *
+ * Used by:
+ * struct btrfs_super_block::(compat|compat_ro|incompat)_flags
+ * struct btrfs_ioctl_feature_flags
+ */
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
+
+/*
+ * Older kernels (< 4.9) on big-endian systems produced broken free space tree
+ * bitmaps, and btrfs-progs also used to corrupt the free space tree (versions
+ * < 4.7.3). If this bit is clear, then the free space tree cannot be trusted.
+ * btrfs-progs can also intentionally clear this bit to ask the kernel to
+ * rebuild the free space tree, however this might not work on older kernels
+ * that do not know about this bit. If not sure, clear the cache manually on
+ * first mount when booting older kernel versions.
+ */
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID (1ULL << 1)
+
+#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
+#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
+#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
+#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
+#define BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD (1ULL << 4)
+
+/*
+ * Older kernels tried to do bigger metadata blocks, but the
+ * code was pretty buggy. Lets not let them try anymore.
+ */
+#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
+
+#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
+#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
+#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
+#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
+#define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10)
+#define BTRFS_FEATURE_INCOMPAT_RAID1C34 (1ULL << 11)
+
+/*
+ * Compat flags that we support.
+ *
+ * If any incompat flags are set other than the ones specified below then we
+ * will fail to mount.
+ */
+#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
+#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
+#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
+
+#define BTRFS_FEATURE_COMPAT_RO_SUPP \
+ (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
+ BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
+
+#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
+#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
+
+#define BTRFS_FEATURE_INCOMPAT_SUPP \
+ (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
+ BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
+ BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
+ BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
+ BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
+ BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
+ BTRFS_FEATURE_INCOMPAT_RAID56 | \
+ BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
+ BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
+ BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
+ BTRFS_FEATURE_INCOMPAT_RAID1C34)
+
+#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
+ (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
+#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
+
+#define BTRFS_BACKREF_REV_MAX 256
+#define BTRFS_BACKREF_REV_SHIFT 56
+#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
+ BTRFS_BACKREF_REV_SHIFT)
+
+#define BTRFS_OLD_BACKREF_REV 0
+#define BTRFS_MIXED_BACKREF_REV 1
+
+#define BTRFS_MAX_LEVEL 8
+
+/* Every tree block (leaf or node) starts with this header. */
+struct btrfs_header {
+ /* These first four must match the super block */
+ u8 csum[BTRFS_CSUM_SIZE];
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+ __le64 bytenr; /* Which block this node is supposed to live in */
+ __le64 flags;
+
+ /* Allowed to be different from the super from here on down. */
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ __le64 generation;
+ __le64 owner;
+ __le32 nritems;
+ u8 level;
+} __attribute__ ((__packed__));
+
+/*
+ * A leaf is full of items. Offset and size tell us where to find
+ * the item in the leaf (relative to the start of the data area).
+ */
+struct btrfs_item {
+ struct btrfs_disk_key key;
+ __le32 offset;
+ __le32 size;
+} __attribute__ ((__packed__));
+
+/*
+ * leaves have an item area and a data area:
+ * [item0, item1....itemN] [free space] [dataN...data1, data0]
+ *
+ * The data is separate from the items to get the keys closer together
+ * during searches.
+ */
+struct btrfs_leaf {
+ struct btrfs_header header;
+ struct btrfs_item items[];
+} __attribute__ ((__packed__));
+
+/*
+ * All non-leaf blocks are nodes, they hold only keys and pointers to children
+ * blocks.
+ */
+struct btrfs_key_ptr {
+ struct btrfs_disk_key key;
+ __le64 blockptr;
+ __le64 generation;
+} __attribute__ ((__packed__));
+
+struct btrfs_node {
+ struct btrfs_header header;
+ struct btrfs_key_ptr ptrs[];
+} __attribute__ ((__packed__));
+
+#endif /* __BTRFS_TREE_H__ */
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 127b67fd1c89..61155e8918b8 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -75,7 +75,7 @@ u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
*refp = *ref;
if (name) {
- if (ref->name_len > BTRFS_VOL_NAME_MAX) {
+ if (ref->name_len > BTRFS_NAME_LEN) {
printf("%s: volume name too long: %u\n", __func__,
ref->name_len);
goto out;
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index 06e54f331098..dbe92d13cb81 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -14,7 +14,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
struct btrfs_inode_ref iref;
struct btrfs_root root;
u64 dir;
- char tmp[max(BTRFS_VOL_NAME_MAX, BTRFS_NAME_MAX)];
+ char tmp[BTRFS_NAME_LEN];
char *ptr;
ptr = name + max_len - 1;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 01/26] fs: btrfs: Sync btrfs_btree.h from kernel
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This version includes all needed on-disk format from kernel.
Only need to modify the include headers for u-boot, everything else is
untouched.
Also, since u-boot btrfs is using a different endian convert timing (at
tree block read time), it needs some forced type conversion before
proper cross port.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 3 +-
fs/btrfs/btrfs_tree.h | 766 ---------------
fs/btrfs/ctree.h | 214 +----
fs/btrfs/inode.c | 5 +-
fs/btrfs/kernel-shared/btrfs_tree.h | 1333 +++++++++++++++++++++++++++
fs/btrfs/root.c | 2 +-
fs/btrfs/subvolume.c | 2 +-
7 files changed, 1343 insertions(+), 982 deletions(-)
delete mode 100644 fs/btrfs/btrfs_tree.h
create mode 100644 fs/btrfs/kernel-shared/btrfs_tree.h
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index cb7e18274221..5d3ddd5931f0 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -31,7 +31,8 @@ static int readdir_callback(const struct btrfs_root *root,
char filetime[32], *target = NULL;
time_t mtime;
- if (btrfs_lookup_inode(root, &item->location, &inode, NULL)) {
+ if (btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
+ &inode, NULL)) {
printf("%s: Cannot find inode item for directory entry %.*s!\n",
__func__, item->name_len, name);
return 0;
diff --git a/fs/btrfs/btrfs_tree.h b/fs/btrfs/btrfs_tree.h
deleted file mode 100644
index aa0f3d6c86dd..000000000000
--- a/fs/btrfs/btrfs_tree.h
+++ /dev/null
@@ -1,766 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * From linux/include/uapi/linux/btrfs_tree.h
- */
-
-#ifndef __BTRFS_BTRFS_TREE_H__
-#define __BTRFS_BTRFS_TREE_H__
-
-#include <common.h>
-
-#define BTRFS_VOL_NAME_MAX 255
-#define BTRFS_NAME_MAX 255
-#define BTRFS_LABEL_SIZE 256
-#define BTRFS_FSID_SIZE 16
-#define BTRFS_UUID_SIZE 16
-
-/*
- * This header contains the structure definitions and constants used
- * by file system objects that can be retrieved using
- * the BTRFS_IOC_SEARCH_TREE ioctl. That means basically anything that
- * is needed to describe a leaf node's key or item contents.
- */
-
-/* holds pointers to all of the tree roots */
-#define BTRFS_ROOT_TREE_OBJECTID 1ULL
-
-/* stores information about which extents are in use, and reference counts */
-#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
-
-/*
- * chunk tree stores translations from logical -> physical block numbering
- * the super block points to the chunk tree
- */
-#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
-
-/*
- * stores information about which areas of a given device are in use.
- * one per device. The tree of tree roots points to the device tree
- */
-#define BTRFS_DEV_TREE_OBJECTID 4ULL
-
-/* one per subvolume, storing files and directories */
-#define BTRFS_FS_TREE_OBJECTID 5ULL
-
-/* directory objectid inside the root tree */
-#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
-
-/* holds checksums of all the data extents */
-#define BTRFS_CSUM_TREE_OBJECTID 7ULL
-
-/* holds quota configuration and tracking */
-#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
-
-/* for storing items that use the BTRFS_UUID_KEY* types */
-#define BTRFS_UUID_TREE_OBJECTID 9ULL
-
-/* tracks free space in block groups. */
-#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
-
-/* device stats in the device tree */
-#define BTRFS_DEV_STATS_OBJECTID 0ULL
-
-/* for storing balance parameters in the root tree */
-#define BTRFS_BALANCE_OBJECTID -4ULL
-
-/* orhpan objectid for tracking unlinked/truncated files */
-#define BTRFS_ORPHAN_OBJECTID -5ULL
-
-/* does write ahead logging to speed up fsyncs */
-#define BTRFS_TREE_LOG_OBJECTID -6ULL
-#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
-
-/* for space balancing */
-#define BTRFS_TREE_RELOC_OBJECTID -8ULL
-#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
-
-/*
- * extent checksums all have this objectid
- * this allows them to share the logging tree
- * for fsyncs
- */
-#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
-
-/* For storing free space cache */
-#define BTRFS_FREE_SPACE_OBJECTID -11ULL
-
-/*
- * The inode number assigned to the special inode for storing
- * free ino cache
- */
-#define BTRFS_FREE_INO_OBJECTID -12ULL
-
-/* dummy objectid represents multiple objectids */
-#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
-
-/*
- * All files have objectids in this range.
- */
-#define BTRFS_FIRST_FREE_OBJECTID 256ULL
-#define BTRFS_LAST_FREE_OBJECTID -256ULL
-#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
-
-
-/*
- * the device items go into the chunk tree. The key is in the form
- * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
- */
-#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
-
-#define BTRFS_BTREE_INODE_OBJECTID 1
-
-#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
-
-#define BTRFS_DEV_REPLACE_DEVID 0ULL
-
-/*
- * inode items have the data typically returned from stat and store other
- * info about object characteristics. There is one for every file and dir in
- * the FS
- */
-#define BTRFS_INODE_ITEM_KEY 1
-#define BTRFS_INODE_REF_KEY 12
-#define BTRFS_INODE_EXTREF_KEY 13
-#define BTRFS_XATTR_ITEM_KEY 24
-#define BTRFS_ORPHAN_ITEM_KEY 48
-/* reserve 2-15 close to the inode for later flexibility */
-
-/*
- * dir items are the name -> inode pointers in a directory. There is one
- * for every name in a directory.
- */
-#define BTRFS_DIR_LOG_ITEM_KEY 60
-#define BTRFS_DIR_LOG_INDEX_KEY 72
-#define BTRFS_DIR_ITEM_KEY 84
-#define BTRFS_DIR_INDEX_KEY 96
-/*
- * extent data is for file data
- */
-#define BTRFS_EXTENT_DATA_KEY 108
-
-/*
- * extent csums are stored in a separate tree and hold csums for
- * an entire extent on disk.
- */
-#define BTRFS_EXTENT_CSUM_KEY 128
-
-/*
- * root items point to tree roots. They are typically in the root
- * tree used by the super block to find all the other trees
- */
-#define BTRFS_ROOT_ITEM_KEY 132
-
-/*
- * root backrefs tie subvols and snapshots to the directory entries that
- * reference them
- */
-#define BTRFS_ROOT_BACKREF_KEY 144
-
-/*
- * root refs make a fast index for listing all of the snapshots and
- * subvolumes referenced by a given root. They point directly to the
- * directory item in the root that references the subvol
- */
-#define BTRFS_ROOT_REF_KEY 156
-
-/*
- * extent items are in the extent map tree. These record which blocks
- * are used, and how many references there are to each block
- */
-#define BTRFS_EXTENT_ITEM_KEY 168
-
-/*
- * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
- * the length, so we save the level in key->offset instead of the length.
- */
-#define BTRFS_METADATA_ITEM_KEY 169
-
-#define BTRFS_TREE_BLOCK_REF_KEY 176
-
-#define BTRFS_EXTENT_DATA_REF_KEY 178
-
-#define BTRFS_EXTENT_REF_V0_KEY 180
-
-#define BTRFS_SHARED_BLOCK_REF_KEY 182
-
-#define BTRFS_SHARED_DATA_REF_KEY 184
-
-/*
- * block groups give us hints into the extent allocation trees. Which
- * blocks are free etc etc
- */
-#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
-
-/*
- * Every block group is represented in the free space tree by a free space info
- * item, which stores some accounting information. It is keyed on
- * (block_group_start, FREE_SPACE_INFO, block_group_length).
- */
-#define BTRFS_FREE_SPACE_INFO_KEY 198
-
-/*
- * A free space extent tracks an extent of space that is free in a block group.
- * It is keyed on (start, FREE_SPACE_EXTENT, length).
- */
-#define BTRFS_FREE_SPACE_EXTENT_KEY 199
-
-/*
- * When a block group becomes very fragmented, we convert it to use bitmaps
- * instead of extents. A free space bitmap is keyed on
- * (start, FREE_SPACE_BITMAP, length); the corresponding item is a bitmap with
- * (length / sectorsize) bits.
- */
-#define BTRFS_FREE_SPACE_BITMAP_KEY 200
-
-#define BTRFS_DEV_EXTENT_KEY 204
-#define BTRFS_DEV_ITEM_KEY 216
-#define BTRFS_CHUNK_ITEM_KEY 228
-
-/*
- * Records the overall state of the qgroups.
- * There's only one instance of this key present,
- * (0, BTRFS_QGROUP_STATUS_KEY, 0)
- */
-#define BTRFS_QGROUP_STATUS_KEY 240
-/*
- * Records the currently used space of the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_INFO_KEY 242
-/*
- * Contains the user configured limits for the qgroup.
- * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
- */
-#define BTRFS_QGROUP_LIMIT_KEY 244
-/*
- * Records the child-parent relationship of qgroups. For
- * each relation, 2 keys are present:
- * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
- * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
- */
-#define BTRFS_QGROUP_RELATION_KEY 246
-
-/*
- * Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY.
- */
-#define BTRFS_BALANCE_ITEM_KEY 248
-
-/*
- * The key type for tree items that are stored persistently, but do not need to
- * exist for extended period of time. The items can exist in any tree.
- *
- * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - balance status item
- * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
- */
-#define BTRFS_TEMPORARY_ITEM_KEY 248
-
-/*
- * Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY
- */
-#define BTRFS_DEV_STATS_KEY 249
-
-/*
- * The key type for tree items that are stored persistently and usually exist
- * for a long period, eg. filesystem lifetime. The item kinds can be status
- * information, stats or preference values. The item can exist in any tree.
- *
- * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
- *
- * Existing items:
- *
- * - device statistics, store IO stats in the device tree, one key for all
- * stats
- * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
- */
-#define BTRFS_PERSISTENT_ITEM_KEY 249
-
-/*
- * Persistantly stores the device replace state in the device tree.
- * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
- */
-#define BTRFS_DEV_REPLACE_KEY 250
-
-/*
- * Stores items that allow to quickly map UUIDs to something else.
- * These items are part of the filesystem UUID tree.
- * The key is built like this:
- * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
- */
-#if BTRFS_UUID_SIZE != 16
-#error "UUID items require BTRFS_UUID_SIZE == 16!"
-#endif
-#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
-#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
- * received subvols */
-
-/*
- * string items are for debugging. They just store a short string of
- * data in the FS
- */
-#define BTRFS_STRING_ITEM_KEY 253
-
-
-
-/* 32 bytes in various csum fields */
-#define BTRFS_CSUM_SIZE 32
-
-/* csum types */
-#define BTRFS_CSUM_TYPE_CRC32 0
-
-/*
- * flags definitions for directory entry item type
- *
- * Used by:
- * struct btrfs_dir_item.type
- */
-#define BTRFS_FT_UNKNOWN 0
-#define BTRFS_FT_REG_FILE 1
-#define BTRFS_FT_DIR 2
-#define BTRFS_FT_CHRDEV 3
-#define BTRFS_FT_BLKDEV 4
-#define BTRFS_FT_FIFO 5
-#define BTRFS_FT_SOCK 6
-#define BTRFS_FT_SYMLINK 7
-#define BTRFS_FT_XATTR 8
-#define BTRFS_FT_MAX 9
-
-/*
- * The key defines the order in the tree, and so it also defines (optimal)
- * block layout.
- *
- * objectid corresponds to the inode number.
- *
- * type tells us things about the object, and is a kind of stream selector.
- * so for a given inode, keys with type of 1 might refer to the inode data,
- * type of 2 may point to file data in the btree and type == 3 may point to
- * extents.
- *
- * offset is the starting byte offset for this key in the stream.
- */
-
-struct btrfs_key {
- __u64 objectid;
- __u8 type;
- __u64 offset;
-} __attribute__ ((__packed__));
-
-struct btrfs_dev_item {
- /* the internal btrfs device id */
- __u64 devid;
-
- /* size of the device */
- __u64 total_bytes;
-
- /* bytes used */
- __u64 bytes_used;
-
- /* optimal io alignment for this device */
- __u32 io_align;
-
- /* optimal io width for this device */
- __u32 io_width;
-
- /* minimal io size for this device */
- __u32 sector_size;
-
- /* type and info about this device */
- __u64 type;
-
- /* expected generation for this device */
- __u64 generation;
-
- /*
- * starting byte of this partition on the device,
- * to allow for stripe alignment in the future
- */
- __u64 start_offset;
-
- /* grouping information for allocation decisions */
- __u32 dev_group;
-
- /* seek speed 0-100 where 100 is fastest */
- __u8 seek_speed;
-
- /* bandwidth 0-100 where 100 is fastest */
- __u8 bandwidth;
-
- /* btrfs generated uuid for this device */
- __u8 uuid[BTRFS_UUID_SIZE];
-
- /* uuid of FS who owns this device */
- __u8 fsid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_stripe {
- __u64 devid;
- __u64 offset;
- __u8 dev_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_chunk {
- /* size of this chunk in bytes */
- __u64 length;
-
- /* objectid of the root referencing this chunk */
- __u64 owner;
-
- __u64 stripe_len;
- __u64 type;
-
- /* optimal io alignment for this chunk */
- __u32 io_align;
-
- /* optimal io width for this chunk */
- __u32 io_width;
-
- /* minimal io size for this chunk */
- __u32 sector_size;
-
- /* 2^16 stripes is quite a lot, a second limit is the size of a single
- * item in the btree
- */
- __u16 num_stripes;
-
- /* sub stripes only matter for raid10 */
- __u16 sub_stripes;
- struct btrfs_stripe stripe;
- /* additional stripes go here */
-} __attribute__ ((__packed__));
-
-#define BTRFS_FREE_SPACE_EXTENT 1
-#define BTRFS_FREE_SPACE_BITMAP 2
-
-struct btrfs_free_space_entry {
- __u64 offset;
- __u64 bytes;
- __u8 type;
-} __attribute__ ((__packed__));
-
-struct btrfs_free_space_header {
- struct btrfs_key location;
- __u64 generation;
- __u64 num_entries;
- __u64 num_bitmaps;
-} __attribute__ ((__packed__));
-
-#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
-#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
-
-/* Super block flags */
-/* Errors detected */
-#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
-
-#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
-#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
-
-
-/*
- * items in the extent btree are used to record the objectid of the
- * owner of the block and the number of references
- */
-
-struct btrfs_extent_item {
- __u64 refs;
- __u64 generation;
- __u64 flags;
-} __attribute__ ((__packed__));
-
-
-#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
-#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
-
-/* following flags only apply to tree blocks */
-
-/* use full backrefs for extent pointers in the block */
-#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
-
-/*
- * this flag is only used internally by scrub and may be changed@any time
- * it is only declared here to avoid collisions
- */
-#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
-
-struct btrfs_tree_block_info {
- struct btrfs_key key;
- __u8 level;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_data_ref {
- __u64 root;
- __u64 objectid;
- __u64 offset;
- __u32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_shared_data_ref {
- __u32 count;
-} __attribute__ ((__packed__));
-
-struct btrfs_extent_inline_ref {
- __u8 type;
- __u64 offset;
-} __attribute__ ((__packed__));
-
-/* dev extents record free space on individual devices. The owner
- * field points back to the chunk allocation mapping tree that allocated
- * the extent. The chunk tree uuid field is a way to double check the owner
- */
-struct btrfs_dev_extent {
- __u64 chunk_tree;
- __u64 chunk_objectid;
- __u64 chunk_offset;
- __u64 length;
- __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_ref {
- __u64 index;
- __u16 name_len;
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_extref {
- __u64 parent_objectid;
- __u64 index;
- __u16 name_len;
- __u8 name[0];
- /* name goes here */
-} __attribute__ ((__packed__));
-
-struct btrfs_timespec {
- __u64 sec;
- __u32 nsec;
-} __attribute__ ((__packed__));
-
-struct btrfs_inode_item {
- /* nfs style generation number */
- __u64 generation;
- /* transid that last touched this inode */
- __u64 transid;
- __u64 size;
- __u64 nbytes;
- __u64 block_group;
- __u32 nlink;
- __u32 uid;
- __u32 gid;
- __u32 mode;
- __u64 rdev;
- __u64 flags;
-
- /* modification sequence number for NFS */
- __u64 sequence;
-
- /*
- * a little future expansion, for more than this we can
- * just grow the inode item and version it
- */
- __u64 reserved[4];
- struct btrfs_timespec atime;
- struct btrfs_timespec ctime;
- struct btrfs_timespec mtime;
- struct btrfs_timespec otime;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_log_item {
- __u64 end;
-} __attribute__ ((__packed__));
-
-struct btrfs_dir_item {
- struct btrfs_key location;
- __u64 transid;
- __u16 data_len;
- __u16 name_len;
- __u8 type;
-} __attribute__ ((__packed__));
-
-#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
-
-/*
- * Internal in-memory flag that a subvolume has been marked for deletion but
- * still visible as a directory
- */
-#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
-
-struct btrfs_root_item {
- struct btrfs_inode_item inode;
- __u64 generation;
- __u64 root_dirid;
- __u64 bytenr;
- __u64 byte_limit;
- __u64 bytes_used;
- __u64 last_snapshot;
- __u64 flags;
- __u32 refs;
- struct btrfs_key drop_progress;
- __u8 drop_level;
- __u8 level;
-
- /*
- * The following fields appear after subvol_uuids+subvol_times
- * were introduced.
- */
-
- /*
- * This generation number is used to test if the new fields are valid
- * and up to date while reading the root item. Every time the root item
- * is written out, the "generation" field is copied into this field. If
- * anyone ever mounted the fs with an older kernel, we will have
- * mismatching generation values here and thus must invalidate the
- * new fields. See btrfs_update_root and btrfs_find_last_root for
- * details.
- * the offset of generation_v2 is also used as the start for the memset
- * when invalidating the fields.
- */
- __u64 generation_v2;
- __u8 uuid[BTRFS_UUID_SIZE];
- __u8 parent_uuid[BTRFS_UUID_SIZE];
- __u8 received_uuid[BTRFS_UUID_SIZE];
- __u64 ctransid; /* updated when an inode changes */
- __u64 otransid; /* trans when created */
- __u64 stransid; /* trans when sent. non-zero for received subvol */
- __u64 rtransid; /* trans when received. non-zero for received subvol */
- struct btrfs_timespec ctime;
- struct btrfs_timespec otime;
- struct btrfs_timespec stime;
- struct btrfs_timespec rtime;
- __u64 reserved[8]; /* for future */
-} __attribute__ ((__packed__));
-
-/*
- * this is used for both forward and backward root refs
- */
-struct btrfs_root_ref {
- __u64 dirid;
- __u64 sequence;
- __u16 name_len;
-} __attribute__ ((__packed__));
-
-#define BTRFS_FILE_EXTENT_INLINE 0
-#define BTRFS_FILE_EXTENT_REG 1
-#define BTRFS_FILE_EXTENT_PREALLOC 2
-
-enum btrfs_compression_type {
- BTRFS_COMPRESS_NONE = 0,
- BTRFS_COMPRESS_ZLIB = 1,
- BTRFS_COMPRESS_LZO = 2,
- BTRFS_COMPRESS_ZSTD = 3,
- BTRFS_COMPRESS_TYPES = 3,
- BTRFS_COMPRESS_LAST = 4,
-};
-
-struct btrfs_file_extent_item {
- /*
- * transaction id that created this extent
- */
- __u64 generation;
- /*
- * max number of bytes to hold this extent in ram
- * when we split a compressed extent we can't know how big
- * each of the resulting pieces will be. So, this is
- * an upper limit on the size of the extent in ram instead of
- * an exact limit.
- */
- __u64 ram_bytes;
-
- /*
- * 32 bits for the various ways we might encode the data,
- * including compression and encryption. If any of these
- * are set to something a given disk format doesn't understand
- * it is treated like an incompat flag for reading and writing,
- * but not for stat.
- */
- __u8 compression;
- __u8 encryption;
- __u16 other_encoding; /* spare for later use */
-
- /* are we inline data or a real extent? */
- __u8 type;
-
- /*
- * disk space consumed by the extent, checksum blocks are included
- * in these numbers
- *
- * At this offset in the structure, the inline extent data start.
- */
- __u64 disk_bytenr;
- __u64 disk_num_bytes;
- /*
- * the logical offset in file blocks (no csums)
- * this extent record is for. This allows a file extent to point
- * into the middle of an existing extent on disk, sharing it
- * between two snapshots (useful if some bytes in the middle of the
- * extent have changed
- */
- __u64 offset;
- /*
- * the logical number of file blocks (no csums included). This
- * always reflects the size uncompressed and without encoding.
- */
- __u64 num_bytes;
-
-} __attribute__ ((__packed__));
-
-struct btrfs_csum_item {
- __u8 csum;
-} __attribute__ ((__packed__));
-
-/* different types of block groups (and chunks) */
-#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
-#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
-#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
-#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
-#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
-#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
-#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
-#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
-#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
-#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
- BTRFS_SPACE_INFO_GLOBAL_RSV)
-
-enum btrfs_raid_types {
- BTRFS_RAID_RAID10,
- BTRFS_RAID_RAID1,
- BTRFS_RAID_DUP,
- BTRFS_RAID_RAID0,
- BTRFS_RAID_SINGLE,
- BTRFS_RAID_RAID5,
- BTRFS_RAID_RAID6,
- BTRFS_NR_RAID_TYPES
-};
-
-#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
- BTRFS_BLOCK_GROUP_SYSTEM | \
- BTRFS_BLOCK_GROUP_METADATA)
-
-#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
- BTRFS_BLOCK_GROUP_RAID1 | \
- BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6 | \
- BTRFS_BLOCK_GROUP_DUP | \
- BTRFS_BLOCK_GROUP_RAID10)
-#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
- BTRFS_BLOCK_GROUP_RAID6)
-
-/*
- * We need a bit for restriper to be able to tell when chunks of type
- * SINGLE are available. This "extended" profile format is used in
- * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
- * (on-disk). The corresponding on-disk bit in chunk.type is reserved
- * to avoid remappings between two formats in future.
- */
-#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
-
-/*
- * A fake block group type that is used to communicate global block reserve
- * size to userspace via the SPACE_INFO ioctl.
- */
-#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
-
-#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
- BTRFS_AVAIL_ALLOC_BIT_SINGLE)
-
-#endif /* __BTRFS_BTRFS_TREE_H__ */
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 65c152a52fcf..156ce69ed022 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -11,28 +11,16 @@
#include <common.h>
#include <compiler.h>
-#include "btrfs_tree.h"
-
-#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
+#include "kernel-shared/btrfs_tree.h"
#define BTRFS_MAX_MIRRORS 3
-#define BTRFS_MAX_LEVEL 8
-
-#define BTRFS_COMPAT_EXTENT_TREE_V0
-
/*
* the max metadata block size. This limit is somewhat artificial,
* but the memmove costs go through the roof for larger blocks.
*/
#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
-/*
- * we can actually store much bigger names, but lets not confuse the rest
- * of linux
- */
-#define BTRFS_NAME_LEN 255
-
/*
* Theoretical limit is larger, but we keep this down to a sane
* value. That should limit greatly the possibility of collisions on
@@ -40,8 +28,6 @@
*/
#define BTRFS_LINK_MAX 65535U
-static const int btrfs_csum_sizes[] = { 4 };
-
/* four bytes for CRC32 */
#define BTRFS_EMPTY_DIR_SIZE 0
@@ -61,207 +47,12 @@ static const int btrfs_csum_sizes[] = { 4 };
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
-#define BTRFS_BACKREF_REV_MAX 256
-#define BTRFS_BACKREF_REV_SHIFT 56
-#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
- BTRFS_BACKREF_REV_SHIFT)
-
-#define BTRFS_OLD_BACKREF_REV 0
-#define BTRFS_MIXED_BACKREF_REV 1
-
-/*
- * every tree block (leaf or node) starts with this header.
- */
-struct btrfs_header {
- /* these first four must match the super block */
- __u8 csum[BTRFS_CSUM_SIZE];
- __u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- __u64 bytenr; /* which block this node is supposed to live in */
- __u64 flags;
-
- /* allowed to be different from the super from here on down */
- __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- __u64 generation;
- __u64 owner;
- __u32 nritems;
- __u8 level;
-} __attribute__ ((__packed__));
-
-/*
- * this is a very generous portion of the super block, giving us
- * room to translate 14 chunks with 3 stripes each.
- */
-#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
-
-/*
- * just in case we somehow lose the roots and are not able to mount,
- * we store an array of the roots from previous transactions
- * in the super.
- */
-#define BTRFS_NUM_BACKUP_ROOTS 4
-struct btrfs_root_backup {
- __u64 tree_root;
- __u64 tree_root_gen;
-
- __u64 chunk_root;
- __u64 chunk_root_gen;
-
- __u64 extent_root;
- __u64 extent_root_gen;
-
- __u64 fs_root;
- __u64 fs_root_gen;
-
- __u64 dev_root;
- __u64 dev_root_gen;
-
- __u64 csum_root;
- __u64 csum_root_gen;
-
- __u64 total_bytes;
- __u64 bytes_used;
- __u64 num_devices;
- /* future */
- __u64 unused_64[4];
-
- __u8 tree_root_level;
- __u8 chunk_root_level;
- __u8 extent_root_level;
- __u8 fs_root_level;
- __u8 dev_root_level;
- __u8 csum_root_level;
- /* future and to align */
- __u8 unused_8[10];
-} __attribute__ ((__packed__));
-
-/*
- * the super block basically lists the main trees of the FS
- * it currently lacks any block count etc etc
- */
-struct btrfs_super_block {
- __u8 csum[BTRFS_CSUM_SIZE];
- /* the first 4 fields must match struct btrfs_header */
- __u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
- __u64 bytenr; /* this block number */
- __u64 flags;
-
- /* allowed to be different from the btrfs_header from here own down */
- __u64 magic;
- __u64 generation;
- __u64 root;
- __u64 chunk_root;
- __u64 log_root;
-
- /* this will help find the new super based on the log root */
- __u64 log_root_transid;
- __u64 total_bytes;
- __u64 bytes_used;
- __u64 root_dir_objectid;
- __u64 num_devices;
- __u32 sectorsize;
- __u32 nodesize;
- __u32 __unused_leafsize;
- __u32 stripesize;
- __u32 sys_chunk_array_size;
- __u64 chunk_root_generation;
- __u64 compat_flags;
- __u64 compat_ro_flags;
- __u64 incompat_flags;
- __u16 csum_type;
- __u8 root_level;
- __u8 chunk_root_level;
- __u8 log_root_level;
- struct btrfs_dev_item dev_item;
-
- char label[BTRFS_LABEL_SIZE];
-
- __u64 cache_generation;
- __u64 uuid_tree_generation;
-
- /* future expansion */
- __u64 reserved[30];
- __u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
- struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
-} __attribute__ ((__packed__));
-
-/*
- * Compat flags that we support. If any incompat flags are set other than the
- * ones specified below then we will fail to mount
- */
-#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
-#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
-#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
-
-#define BTRFS_FEATURE_COMPAT_RO_SUPP \
- (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
- BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
-
-#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
-#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
-
-#define BTRFS_FEATURE_INCOMPAT_SUPP \
- (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
- BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
- BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
- BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
- BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
- BTRFS_FEATURE_INCOMPAT_RAID56 | \
- BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
- BTRFS_FEATURE_INCOMPAT_NO_HOLES)
-
-#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
- (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
-#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
-
-/*
- * A leaf is full of items. offset and size tell us where to find
- * the item in the leaf (relative to the start of the data area)
- */
-struct btrfs_item {
- struct btrfs_key key;
- __u32 offset;
- __u32 size;
-} __attribute__ ((__packed__));
-
-/*
- * leaves have an item area and a data area:
- * [item0, item1....itemN] [free space] [dataN...data1, data0]
- *
- * The data is separate from the items to get the keys closer together
- * during searches.
- */
-struct btrfs_leaf {
- struct btrfs_header header;
- struct btrfs_item items[];
-} __attribute__ ((__packed__));
-
-/*
- * all non-leaf blocks are nodes, they hold only keys and pointers to
- * other blocks
- */
-struct btrfs_key_ptr {
- struct btrfs_key key;
- __u64 blockptr;
- __u64 generation;
-} __attribute__ ((__packed__));
-
-struct btrfs_node {
- struct btrfs_header header;
- struct btrfs_key_ptr ptrs[];
-} __attribute__ ((__packed__));
-
union btrfs_tree_node {
struct btrfs_header header;
struct btrfs_leaf leaf;
struct btrfs_node node;
};
-typedef __u8 u8;
-typedef __u16 u16;
-typedef __u32 u32;
-typedef __u64 u64;
-
struct btrfs_path {
union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
u32 slots[BTRFS_MAX_LEVEL];
@@ -283,7 +74,8 @@ int btrfs_prev_slot(struct btrfs_path *);
int btrfs_next_slot(struct btrfs_path *);
static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
- return &p->nodes[0]->leaf.items[p->slots[0]].key;
+ /* At tree read time we have converted the endian for btrfs_disk_key */
+ return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
}
static inline struct btrfs_key *
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 991c2f68c3b7..d88ae67217b1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -29,7 +29,7 @@ u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
*refp = *ref;
if (name) {
- if (ref->name_len > BTRFS_NAME_MAX) {
+ if (ref->name_len > BTRFS_NAME_LEN) {
printf("%s: inode name too long: %u\n", __func__,
ref->name_len);
goto out;
@@ -255,7 +255,8 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
type = item.type;
have_inode = 1;
- if (btrfs_lookup_inode(root, &item.location, &inode_item, root))
+ if (btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
+ &inode_item, root))
return -1ULL;
if (item.type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
diff --git a/fs/btrfs/kernel-shared/btrfs_tree.h b/fs/btrfs/kernel-shared/btrfs_tree.h
new file mode 100644
index 000000000000..7d245f900104
--- /dev/null
+++ b/fs/btrfs/kernel-shared/btrfs_tree.h
@@ -0,0 +1,1333 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copied from kernel/include/uapi/linux/btrfs_btree.h.
+ *
+ * Only modified the header.
+ */
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __BTRFS_TREE_H__
+#define __BTRFS_TREE_H__
+
+#include <linux/types.h>
+
+#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
+
+/*
+ * The max metadata block size (node size).
+ *
+ * This limit is somewhat artificial. The memmove and tree block locking cost
+ * go up with larger node size.
+ */
+#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
+
+/*
+ * We can actually store much bigger names, but lets not confuse the rest
+ * of linux.
+ *
+ * btrfs_dir_item::name_len follows this limitation.
+ */
+#define BTRFS_NAME_LEN 255
+
+/*
+ * Objectids start from here.
+ *
+ * Check btrfs_disk_key for the meaning of objectids.
+ */
+
+/*
+ * Root tree holds pointers to all of the tree roots.
+ * Without special mention, the root tree contains the root bytenr of all other
+ * trees, except the chunk tree and the log tree.
+ *
+ * The super block contains the root bytenr of this tree.
+ */
+#define BTRFS_ROOT_TREE_OBJECTID 1ULL
+
+/*
+ * Extent tree stores information about which extents are in use, and backrefs
+ * for each extent.
+ */
+#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
+
+/*
+ * Chunk tree stores btrfs logical address -> physical address mapping.
+ *
+ * The super block contains part of chunk tree for bootstrap, and contains
+ * the root bytenr of this tree.
+ */
+#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
+
+/*
+ * Device tree stores info about which areas of a given device are in use,
+ * and physical address -> btrfs logical address mapping.
+ */
+#define BTRFS_DEV_TREE_OBJECTID 4ULL
+
+/* The fs tree is the first subvolume tree, storing files and directories. */
+#define BTRFS_FS_TREE_OBJECTID 5ULL
+
+/* Shows the directory objectid inside the root tree. */
+#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
+
+/* Csum tree holds checksums of all the data extents. */
+#define BTRFS_CSUM_TREE_OBJECTID 7ULL
+
+/* Quota tree holds quota configuration and tracking. */
+#define BTRFS_QUOTA_TREE_OBJECTID 8ULL
+
+/* UUID tree stores items that use the BTRFS_UUID_KEY* types. */
+#define BTRFS_UUID_TREE_OBJECTID 9ULL
+
+/* Free space cache tree (v2 space cache) tracks free space in block groups. */
+#define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
+
+/* Indicates device stats in the device tree. */
+#define BTRFS_DEV_STATS_OBJECTID 0ULL
+
+/* For storing balance parameters in the root tree. */
+#define BTRFS_BALANCE_OBJECTID -4ULL
+
+/* Orhpan objectid for tracking unlinked/truncated files. */
+#define BTRFS_ORPHAN_OBJECTID -5ULL
+
+/* Does write ahead logging to speed up fsyncs. */
+#define BTRFS_TREE_LOG_OBJECTID -6ULL
+#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
+
+/* For space balancing. */
+#define BTRFS_TREE_RELOC_OBJECTID -8ULL
+#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
+
+/* Extent checksums, shared between the csum tree and log trees. */
+#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
+
+/* For storing free space cache (v1 space cache). */
+#define BTRFS_FREE_SPACE_OBJECTID -11ULL
+
+/* The inode number assigned to the special inode for storing free ino cache. */
+#define BTRFS_FREE_INO_OBJECTID -12ULL
+
+/* Dummy objectid represents multiple objectids. */
+#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
+
+/* All files have objectids in this range. */
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#define BTRFS_LAST_FREE_OBJECTID -256ULL
+#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
+
+
+/*
+ * The device items go into the chunk tree.
+ *
+ * The key is in the form
+ * (BTRFS_DEV_ITEMS_OBJECTID, BTRFS_DEV_ITEM_KEY, <device_id>)
+ */
+#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
+
+#define BTRFS_BTREE_INODE_OBJECTID 1
+
+#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
+
+#define BTRFS_DEV_REPLACE_DEVID 0ULL
+
+/*
+ * Types start from here.
+ *
+ * Check btrfs_disk_key for details about types.
+ */
+
+/*
+ * Inode items have the data typically returned from stat and store other
+ * info about object characteristics.
+ *
+ * There is one for every file and dir in the FS.
+ */
+#define BTRFS_INODE_ITEM_KEY 1
+/* reserve 2-11 close to the inode for later flexibility */
+#define BTRFS_INODE_REF_KEY 12
+#define BTRFS_INODE_EXTREF_KEY 13
+#define BTRFS_XATTR_ITEM_KEY 24
+#define BTRFS_ORPHAN_ITEM_KEY 48
+
+/*
+ * Dir items are the name -> inode pointers in a directory.
+ *
+ * There is one for every name in a directory.
+ */
+#define BTRFS_DIR_LOG_ITEM_KEY 60
+#define BTRFS_DIR_LOG_INDEX_KEY 72
+#define BTRFS_DIR_ITEM_KEY 84
+#define BTRFS_DIR_INDEX_KEY 96
+
+/* Stores info (position, size ...) about a data extent of a file */
+#define BTRFS_EXTENT_DATA_KEY 108
+
+/*
+ * Extent csums are stored in a separate tree and hold csums for
+ * an entire extent on disk.
+ */
+#define BTRFS_EXTENT_CSUM_KEY 128
+
+/*
+ * Root items point to tree roots.
+ *
+ * They are typically in the root tree used by the super block to find all the
+ * other trees.
+ */
+#define BTRFS_ROOT_ITEM_KEY 132
+
+/*
+ * Root backrefs tie subvols and snapshots to the directory entries that
+ * reference them.
+ */
+#define BTRFS_ROOT_BACKREF_KEY 144
+
+/*
+ * Root refs make a fast index for listing all of the snapshots and
+ * subvolumes referenced by a given root. They point directly to the
+ * directory item in the root that references the subvol.
+ */
+#define BTRFS_ROOT_REF_KEY 156
+
+/*
+ * Extent items are in the extent tree.
+ *
+ * These record which blocks are used, and how many references there are.
+ */
+#define BTRFS_EXTENT_ITEM_KEY 168
+
+/*
+ * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know
+ * the length, so we save the level in key->offset instead of the length.
+ */
+#define BTRFS_METADATA_ITEM_KEY 169
+
+#define BTRFS_TREE_BLOCK_REF_KEY 176
+
+#define BTRFS_EXTENT_DATA_REF_KEY 178
+
+#define BTRFS_EXTENT_REF_V0_KEY 180
+
+#define BTRFS_SHARED_BLOCK_REF_KEY 182
+
+#define BTRFS_SHARED_DATA_REF_KEY 184
+
+/*
+ * Block groups give us hints into the extent allocation trees.
+ *
+ * Stores how many free space there is in a block group.
+ */
+#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
+
+/*
+ * Every block group is represented in the free space tree by a free space info
+ * item, which stores some accounting information. It is keyed on
+ * (block_group_start, FREE_SPACE_INFO, block_group_length).
+ */
+#define BTRFS_FREE_SPACE_INFO_KEY 198
+
+/*
+ * A free space extent tracks an extent of space that is free in a block group.
+ * It is keyed on (start, FREE_SPACE_EXTENT, length).
+ */
+#define BTRFS_FREE_SPACE_EXTENT_KEY 199
+
+/*
+ * When a block group becomes very fragmented, we convert it to use bitmaps
+ * instead of extents.
+ *
+ * A free space bitmap is keyed on (start, FREE_SPACE_BITMAP, length).
+ * The corresponding item is a bitmap with (length / sectorsize) bits.
+ */
+#define BTRFS_FREE_SPACE_BITMAP_KEY 200
+
+#define BTRFS_DEV_EXTENT_KEY 204
+#define BTRFS_DEV_ITEM_KEY 216
+#define BTRFS_CHUNK_ITEM_KEY 228
+
+/*
+ * Records the overall state of the qgroups.
+ *
+ * There's only one instance of this key present,
+ * (0, BTRFS_QGROUP_STATUS_KEY, 0)
+ */
+#define BTRFS_QGROUP_STATUS_KEY 240
+/*
+ * Records the currently used space of the qgroup.
+ *
+ * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid).
+ */
+#define BTRFS_QGROUP_INFO_KEY 242
+
+/*
+ * Contains the user configured limits for the qgroup.
+ *
+ * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid).
+ */
+#define BTRFS_QGROUP_LIMIT_KEY 244
+
+/*
+ * Records the child-parent relationship of qgroups. For
+ * each relation, 2 keys are present:
+ * (childid, BTRFS_QGROUP_RELATION_KEY, parentid)
+ * (parentid, BTRFS_QGROUP_RELATION_KEY, childid)
+ */
+#define BTRFS_QGROUP_RELATION_KEY 246
+
+/* Obsolete name, see BTRFS_TEMPORARY_ITEM_KEY. */
+#define BTRFS_BALANCE_ITEM_KEY 248
+
+/*
+ * The key type for tree items that are stored persistently, but do not need to
+ * exist for extended period of time. The items can exist in any tree.
+ *
+ * [subtype, BTRFS_TEMPORARY_ITEM_KEY, data]
+ *
+ * Existing items:
+ *
+ * - balance status item
+ * (BTRFS_BALANCE_OBJECTID, BTRFS_TEMPORARY_ITEM_KEY, 0)
+ */
+#define BTRFS_TEMPORARY_ITEM_KEY 248
+
+/* Obsolete name, see BTRFS_PERSISTENT_ITEM_KEY */
+#define BTRFS_DEV_STATS_KEY 249
+
+/*
+ * The key type for tree items that are stored persistently and usually exist
+ * for a long period, eg. filesystem lifetime. The item kinds can be status
+ * information, stats or preference values. The item can exist in any tree.
+ *
+ * [subtype, BTRFS_PERSISTENT_ITEM_KEY, data]
+ *
+ * Existing items:
+ *
+ * - device statistics, store IO stats in the device tree, one key for all
+ * stats
+ * (BTRFS_DEV_STATS_OBJECTID, BTRFS_DEV_STATS_KEY, 0)
+ */
+#define BTRFS_PERSISTENT_ITEM_KEY 249
+
+/*
+ * Persistently stores the device replace state in the device tree.
+ *
+ * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0).
+ */
+#define BTRFS_DEV_REPLACE_KEY 250
+
+/*
+ * Stores items that allow to quickly map UUIDs to something else.
+ *
+ * These items are part of the filesystem UUID tree.
+ * The key is built like this:
+ * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits).
+ */
+#define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */
+#define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to
+ * received subvols */
+
+/*
+ * String items are for debugging.
+ *
+ * They just store a short string of data in the FS.
+ */
+#define BTRFS_STRING_ITEM_KEY 253
+
+
+
+/* 32 bytes in various csum fields */
+#define BTRFS_CSUM_SIZE 32
+
+/* Csum types */
+enum btrfs_csum_type {
+ BTRFS_CSUM_TYPE_CRC32 = 0,
+ BTRFS_CSUM_TYPE_XXHASH = 1,
+ BTRFS_CSUM_TYPE_SHA256 = 2,
+ BTRFS_CSUM_TYPE_BLAKE2 = 3,
+};
+
+/*
+ * Flags definitions for directory entry item type.
+ *
+ * Used by:
+ * struct btrfs_dir_item.type
+ *
+ * Values 0..7 must match common file type values in fs_types.h.
+ */
+#define BTRFS_FT_UNKNOWN 0
+#define BTRFS_FT_REG_FILE 1
+#define BTRFS_FT_DIR 2
+#define BTRFS_FT_CHRDEV 3
+#define BTRFS_FT_BLKDEV 4
+#define BTRFS_FT_FIFO 5
+#define BTRFS_FT_SOCK 6
+#define BTRFS_FT_SYMLINK 7
+#define BTRFS_FT_XATTR 8
+#define BTRFS_FT_MAX 9
+
+#define BTRFS_FSID_SIZE 16
+#define BTRFS_UUID_SIZE 16
+
+/*
+ * The key defines the order in the tree, and so it also defines (optimal)
+ * block layout.
+ *
+ * Objectid and offset are interpreted based on type.
+ * While normally for objectid, it either represents a root number, or an
+ * inode number.
+ *
+ * Type tells us things about the object, and is a kind of stream selector.
+ * Check the following URL for full references about btrfs_disk_key/btrfs_key:
+ * https://btrfs.wiki.kernel.org/index.php/Btree_Items
+ *
+ * btrfs_disk_key is in disk byte order. struct btrfs_key is always
+ * in cpu native order. Otherwise they are identical and their sizes
+ * should be the same (ie both packed)
+ */
+struct btrfs_disk_key {
+ __le64 objectid;
+ __u8 type;
+ __le64 offset;
+} __attribute__ ((__packed__));
+
+struct btrfs_key {
+ __u64 objectid;
+ __u8 type;
+ __u64 offset;
+} __attribute__ ((__packed__));
+
+struct btrfs_dev_item {
+ /* The internal btrfs device id */
+ __le64 devid;
+
+ /* Size of the device */
+ __le64 total_bytes;
+
+ /* Bytes used */
+ __le64 bytes_used;
+
+ /* Optimal io alignment for this device */
+ __le32 io_align;
+
+ /* Optimal io width for this device */
+ __le32 io_width;
+
+ /* Minimal io size for this device */
+ __le32 sector_size;
+
+ /* Type and info about this device */
+ __le64 type;
+
+ /* Expected generation for this device */
+ __le64 generation;
+
+ /*
+ * Starting byte of this partition on the device,
+ * to allow for stripe alignment in the future.
+ */
+ __le64 start_offset;
+
+ /* Grouping information for allocation decisions */
+ __le32 dev_group;
+
+ /* Optimal seek speed 0-100 where 100 is fastest */
+ __u8 seek_speed;
+
+ /* Optimal bandwidth 0-100 where 100 is fastest */
+ __u8 bandwidth;
+
+ /* Btrfs generated uuid for this device */
+ __u8 uuid[BTRFS_UUID_SIZE];
+
+ /* UUID of FS who owns this device */
+ __u8 fsid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_stripe {
+ __le64 devid;
+ __le64 offset;
+ __u8 dev_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_chunk {
+ /* Size of this chunk in bytes */
+ __le64 length;
+
+ /* Objectid of the root referencing this chunk */
+ __le64 owner;
+
+ __le64 stripe_len;
+ __le64 type;
+
+ /* Optimal io alignment for this chunk */
+ __le32 io_align;
+
+ /* Optimal io width for this chunk */
+ __le32 io_width;
+
+ /* Minimal io size for this chunk */
+ __le32 sector_size;
+
+ /*
+ * 2^16 stripes is quite a lot, a second limit is the size of a single
+ * item in the btree.
+ */
+ __le16 num_stripes;
+
+ /* Sub stripes only matter for raid10 */
+ __le16 sub_stripes;
+ struct btrfs_stripe stripe;
+ /* additional stripes go here */
+} __attribute__ ((__packed__));
+
+#define BTRFS_FREE_SPACE_EXTENT 1
+#define BTRFS_FREE_SPACE_BITMAP 2
+
+struct btrfs_free_space_entry {
+ __le64 offset;
+ __le64 bytes;
+ __u8 type;
+} __attribute__ ((__packed__));
+
+struct btrfs_free_space_header {
+ struct btrfs_disk_key location;
+ __le64 generation;
+ __le64 num_entries;
+ __le64 num_bitmaps;
+} __attribute__ ((__packed__));
+
+#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
+#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
+
+/* Super block flags */
+/* Errors detected */
+#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
+
+#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
+#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
+#define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
+#define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
+#define BTRFS_SUPER_FLAG_CHANGING_FSID_V2 (1ULL << 36)
+
+
+/*
+ * Items in the extent tree are used to record the objectid of the
+ * owner of the block and the number of references.
+ */
+struct btrfs_extent_item {
+ __le64 refs;
+ __le64 generation;
+ __le64 flags;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_item_v0 {
+ __le32 refs;
+} __attribute__ ((__packed__));
+
+
+#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
+#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
+
+/* Use full backrefs for extent pointers in the block */
+#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
+
+/*
+ * This flag is only used internally by scrub and may be changed at any time
+ * it is only declared here to avoid collisions.
+ */
+#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
+
+struct btrfs_tree_block_info {
+ struct btrfs_disk_key key;
+ __u8 level;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_data_ref {
+ __le64 root;
+ __le64 objectid;
+ __le64 offset;
+ __le32 count;
+} __attribute__ ((__packed__));
+
+struct btrfs_shared_data_ref {
+ __le32 count;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_inline_ref {
+ __u8 type;
+ __le64 offset;
+} __attribute__ ((__packed__));
+
+/* Old style backrefs item */
+struct btrfs_extent_ref_v0 {
+ __le64 root;
+ __le64 generation;
+ __le64 objectid;
+ __le32 count;
+} __attribute__ ((__packed__));
+
+
+/* Dev extents record used space on individual devices.
+ *
+ * The owner field points back to the chunk allocation mapping tree that
+ * allocated the extent.
+ * The chunk tree uuid field is a way to double check the owner.
+ */
+struct btrfs_dev_extent {
+ __le64 chunk_tree;
+ __le64 chunk_objectid;
+ __le64 chunk_offset;
+ __le64 length;
+ __u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_ref {
+ __le64 index;
+ __le16 name_len;
+ /* Name goes here */
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_extref {
+ __le64 parent_objectid;
+ __le64 index;
+ __le16 name_len;
+ __u8 name[0];
+ /* Name goes here */
+} __attribute__ ((__packed__));
+
+struct btrfs_timespec {
+ __le64 sec;
+ __le32 nsec;
+} __attribute__ ((__packed__));
+
+/* Inode flags */
+#define BTRFS_INODE_NODATASUM (1 << 0)
+#define BTRFS_INODE_NODATACOW (1 << 1)
+#define BTRFS_INODE_READONLY (1 << 2)
+#define BTRFS_INODE_NOCOMPRESS (1 << 3)
+#define BTRFS_INODE_PREALLOC (1 << 4)
+#define BTRFS_INODE_SYNC (1 << 5)
+#define BTRFS_INODE_IMMUTABLE (1 << 6)
+#define BTRFS_INODE_APPEND (1 << 7)
+#define BTRFS_INODE_NODUMP (1 << 8)
+#define BTRFS_INODE_NOATIME (1 << 9)
+#define BTRFS_INODE_DIRSYNC (1 << 10)
+#define BTRFS_INODE_COMPRESS (1 << 11)
+
+#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
+
+#define BTRFS_INODE_FLAG_MASK \
+ (BTRFS_INODE_NODATASUM | \
+ BTRFS_INODE_NODATACOW | \
+ BTRFS_INODE_READONLY | \
+ BTRFS_INODE_NOCOMPRESS | \
+ BTRFS_INODE_PREALLOC | \
+ BTRFS_INODE_SYNC | \
+ BTRFS_INODE_IMMUTABLE | \
+ BTRFS_INODE_APPEND | \
+ BTRFS_INODE_NODUMP | \
+ BTRFS_INODE_NOATIME | \
+ BTRFS_INODE_DIRSYNC | \
+ BTRFS_INODE_COMPRESS | \
+ BTRFS_INODE_ROOT_ITEM_INIT)
+
+struct btrfs_inode_item {
+ /* Nfs style generation number */
+ __le64 generation;
+ /* Transid that last touched this inode */
+ __le64 transid;
+ __le64 size;
+ __le64 nbytes;
+ __le64 block_group;
+ __le32 nlink;
+ __le32 uid;
+ __le32 gid;
+ __le32 mode;
+ __le64 rdev;
+ __le64 flags;
+
+ /* Modification sequence number for NFS */
+ __le64 sequence;
+
+ /*
+ * A little future expansion, for more than this we can just grow the
+ * inode item and version it
+ */
+ __le64 reserved[4];
+ struct btrfs_timespec atime;
+ struct btrfs_timespec ctime;
+ struct btrfs_timespec mtime;
+ struct btrfs_timespec otime;
+} __attribute__ ((__packed__));
+
+struct btrfs_dir_log_item {
+ __le64 end;
+} __attribute__ ((__packed__));
+
+struct btrfs_dir_item {
+ struct btrfs_disk_key location;
+ __le64 transid;
+ __le16 data_len;
+ __le16 name_len;
+ __u8 type;
+} __attribute__ ((__packed__));
+
+#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
+
+/*
+ * Internal in-memory flag that a subvolume has been marked for deletion but
+ * still visible as a directory
+ */
+#define BTRFS_ROOT_SUBVOL_DEAD (1ULL << 48)
+
+struct btrfs_root_item {
+ struct btrfs_inode_item inode;
+ __le64 generation;
+ __le64 root_dirid;
+ __le64 bytenr;
+ __le64 byte_limit;
+ __le64 bytes_used;
+ __le64 last_snapshot;
+ __le64 flags;
+ __le32 refs;
+ struct btrfs_disk_key drop_progress;
+ __u8 drop_level;
+ __u8 level;
+
+ /*
+ * The following fields appear after subvol_uuids+subvol_times
+ * were introduced.
+ */
+
+ /*
+ * This generation number is used to test if the new fields are valid
+ * and up to date while reading the root item. Every time the root item
+ * is written out, the "generation" field is copied into this field. If
+ * anyone ever mounted the fs with an older kernel, we will have
+ * mismatching generation values here and thus must invalidate the
+ * new fields. See btrfs_update_root and btrfs_find_last_root for
+ * details.
+ * The offset of generation_v2 is also used as the start for the memset
+ * when invalidating the fields.
+ */
+ __le64 generation_v2;
+ __u8 uuid[BTRFS_UUID_SIZE];
+ __u8 parent_uuid[BTRFS_UUID_SIZE];
+ __u8 received_uuid[BTRFS_UUID_SIZE];
+ __le64 ctransid; /* Updated when an inode changes */
+ __le64 otransid; /* Trans when created */
+ __le64 stransid; /* Trans when sent. Non-zero for received subvol. */
+ __le64 rtransid; /* Trans when received. Non-zero for received subvol.*/
+ struct btrfs_timespec ctime;
+ struct btrfs_timespec otime;
+ struct btrfs_timespec stime;
+ struct btrfs_timespec rtime;
+ __le64 reserved[8]; /* For future */
+} __attribute__ ((__packed__));
+
+/* This is used for both forward and backward root refs */
+struct btrfs_root_ref {
+ __le64 dirid;
+ __le64 sequence;
+ __le16 name_len;
+} __attribute__ ((__packed__));
+
+struct btrfs_disk_balance_args {
+ /*
+ * Profiles to operate on.
+ *
+ * SINGLE is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE.
+ */
+ __le64 profiles;
+
+ /*
+ * Usage filter
+ * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
+ * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
+ */
+ union {
+ __le64 usage;
+ struct {
+ __le32 usage_min;
+ __le32 usage_max;
+ };
+ };
+
+ /* Devid filter */
+ __le64 devid;
+
+ /* Devid subset filter [pstart..pend) */
+ __le64 pstart;
+ __le64 pend;
+
+ /* Btrfs virtual address space subset filter [vstart..vend) */
+ __le64 vstart;
+ __le64 vend;
+
+ /*
+ * Profile to convert to.
+ *
+ * SINGLE is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE.
+ */
+ __le64 target;
+
+ /* BTRFS_BALANCE_ARGS_* */
+ __le64 flags;
+
+ /*
+ * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'.
+ * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
+ * and maximum.
+ */
+ union {
+ __le64 limit;
+ struct {
+ __le32 limit_min;
+ __le32 limit_max;
+ };
+ };
+
+ /*
+ * Process chunks that cross stripes_min..stripes_max devices,
+ * BTRFS_BALANCE_ARGS_STRIPES_RANGE.
+ */
+ __le32 stripes_min;
+ __le32 stripes_max;
+
+ __le64 unused[6];
+} __attribute__ ((__packed__));
+
+/*
+ * Stores balance parameters to disk so that balance can be properly
+ * resumed after crash or unmount.
+ */
+struct btrfs_balance_item {
+ /* BTRFS_BALANCE_* */
+ __le64 flags;
+
+ struct btrfs_disk_balance_args data;
+ struct btrfs_disk_balance_args meta;
+ struct btrfs_disk_balance_args sys;
+
+ __le64 unused[4];
+} __attribute__ ((__packed__));
+
+enum {
+ BTRFS_FILE_EXTENT_INLINE = 0,
+ BTRFS_FILE_EXTENT_REG = 1,
+ BTRFS_FILE_EXTENT_PREALLOC = 2,
+ BTRFS_NR_FILE_EXTENT_TYPES = 3,
+};
+
+enum btrfs_compression_type {
+ BTRFS_COMPRESS_NONE = 0,
+ BTRFS_COMPRESS_ZLIB = 1,
+ BTRFS_COMPRESS_LZO = 2,
+ BTRFS_COMPRESS_ZSTD = 3,
+ BTRFS_NR_COMPRESS_TYPES = 4,
+};
+
+struct btrfs_file_extent_item {
+ /* Transaction id that created this extent */
+ __le64 generation;
+ /*
+ * Max number of bytes to hold this extent in ram.
+ *
+ * When we split a compressed extent we can't know how big each of the
+ * resulting pieces will be. So, this is an upper limit on the size of
+ * the extent in ram instead of an exact limit.
+ */
+ __le64 ram_bytes;
+
+ /*
+ * 32 bits for the various ways we might encode the data,
+ * including compression and encryption. If any of these
+ * are set to something a given disk format doesn't understand
+ * it is treated like an incompat flag for reading and writing,
+ * but not for stat.
+ */
+ __u8 compression;
+ __u8 encryption;
+ __le16 other_encoding; /* Spare for later use */
+
+ /* Are we inline data or a real extent? */
+ __u8 type;
+
+ /*
+ * Disk space consumed by the extent, checksum blocks are not included
+ * in these numbers
+ *
+ * At this offset in the structure, the inline extent data start.
+ */
+ __le64 disk_bytenr;
+ __le64 disk_num_bytes;
+
+ /*
+ * The logical offset inside the file extent.
+ *
+ * This allows a file extent to point into the middle of an existing
+ * extent on disk, sharing it between two snapshots (useful if some
+ * bytes in the middle of the extent have changed).
+ */
+ __le64 offset;
+
+ /*
+ * The logical number of bytes this file extent is referencing (no
+ * csums included).
+ *
+ * This always reflects the size uncompressed and without encoding.
+ */
+ __le64 num_bytes;
+
+} __attribute__ ((__packed__));
+
+struct btrfs_csum_item {
+ __u8 csum;
+} __attribute__ ((__packed__));
+
+enum btrfs_dev_stat_values {
+ /* Disk I/O failure stats */
+ BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
+ BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
+ BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
+
+ /* Stats for indirect indications for I/O failures */
+ BTRFS_DEV_STAT_CORRUPTION_ERRS, /* Checksum error, bytenr error or
+ * contents is illegal: this is an
+ * indication that the block was damaged
+ * during read or write, or written to
+ * wrong location or read from wrong
+ * location */
+ BTRFS_DEV_STAT_GENERATION_ERRS, /* An indication that blocks have not
+ * been written */
+
+ BTRFS_DEV_STAT_VALUES_MAX
+};
+
+struct btrfs_dev_stats_item {
+ /*
+ * Grow this item struct at the end for future enhancements and keep
+ * the existing values unchanged.
+ */
+ __le64 values[BTRFS_DEV_STAT_VALUES_MAX];
+} __attribute__ ((__packed__));
+
+#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0
+#define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1
+
+struct btrfs_dev_replace_item {
+ /*
+ * Grow this item struct@the end for future enhancements and keep
+ * the existing values unchanged.
+ */
+ __le64 src_devid;
+ __le64 cursor_left;
+ __le64 cursor_right;
+ __le64 cont_reading_from_srcdev_mode;
+
+ __le64 replace_state;
+ __le64 time_started;
+ __le64 time_stopped;
+ __le64 num_write_errors;
+ __le64 num_uncorrectable_read_errors;
+} __attribute__ ((__packed__));
+
+/* Different types of block groups (and chunks) */
+#define BTRFS_BLOCK_GROUP_DATA (1ULL << 0)
+#define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1)
+#define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2)
+#define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3)
+#define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4)
+#define BTRFS_BLOCK_GROUP_DUP (1ULL << 5)
+#define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6)
+#define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7)
+#define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8)
+#define BTRFS_BLOCK_GROUP_RAID1C3 (1ULL << 9)
+#define BTRFS_BLOCK_GROUP_RAID1C4 (1ULL << 10)
+#define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \
+ BTRFS_SPACE_INFO_GLOBAL_RSV)
+
+enum btrfs_raid_types {
+ BTRFS_RAID_RAID10,
+ BTRFS_RAID_RAID1,
+ BTRFS_RAID_DUP,
+ BTRFS_RAID_RAID0,
+ BTRFS_RAID_SINGLE,
+ BTRFS_RAID_RAID5,
+ BTRFS_RAID_RAID6,
+ BTRFS_RAID_RAID1C3,
+ BTRFS_RAID_RAID1C4,
+ BTRFS_NR_RAID_TYPES
+};
+
+#define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \
+ BTRFS_BLOCK_GROUP_SYSTEM | \
+ BTRFS_BLOCK_GROUP_METADATA)
+
+#define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
+ BTRFS_BLOCK_GROUP_RAID1 | \
+ BTRFS_BLOCK_GROUP_RAID1C3 | \
+ BTRFS_BLOCK_GROUP_RAID1C4 | \
+ BTRFS_BLOCK_GROUP_RAID5 | \
+ BTRFS_BLOCK_GROUP_RAID6 | \
+ BTRFS_BLOCK_GROUP_DUP | \
+ BTRFS_BLOCK_GROUP_RAID10)
+#define BTRFS_BLOCK_GROUP_RAID56_MASK (BTRFS_BLOCK_GROUP_RAID5 | \
+ BTRFS_BLOCK_GROUP_RAID6)
+
+#define BTRFS_BLOCK_GROUP_RAID1_MASK (BTRFS_BLOCK_GROUP_RAID1 | \
+ BTRFS_BLOCK_GROUP_RAID1C3 | \
+ BTRFS_BLOCK_GROUP_RAID1C4)
+
+/*
+ * We need a bit for restriper to be able to tell when chunks of type
+ * SINGLE are available. This "extended" profile format is used in
+ * fs_info->avail_*_alloc_bits (in-memory) and balance item fields
+ * (on-disk). The corresponding on-disk bit in chunk.type is reserved
+ * to avoid remappings between two formats in future.
+ */
+#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
+
+/*
+ * A fake block group type that is used to communicate global block reserve
+ * size to userspace via the SPACE_INFO ioctl.
+ */
+#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
+
+#define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \
+ BTRFS_AVAIL_ALLOC_BIT_SINGLE)
+
+static inline __u64 chunk_to_extended(__u64 flags)
+{
+ if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)
+ flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+
+ return flags;
+}
+static inline __u64 extended_to_chunk(__u64 flags)
+{
+ return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
+}
+
+struct btrfs_block_group_item {
+ __le64 used;
+ __le64 chunk_objectid;
+ __le64 flags;
+} __attribute__ ((__packed__));
+
+struct btrfs_free_space_info {
+ __le32 extent_count;
+ __le32 flags;
+} __attribute__ ((__packed__));
+
+#define BTRFS_FREE_SPACE_USING_BITMAPS (1ULL << 0)
+
+#define BTRFS_QGROUP_LEVEL_SHIFT 48
+static inline __u64 btrfs_qgroup_level(__u64 qgroupid)
+{
+ return qgroupid >> BTRFS_QGROUP_LEVEL_SHIFT;
+}
+
+/* Is subvolume quota turned on? */
+#define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0)
+
+/* Is qgroup rescan running? */
+#define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1)
+
+/*
+ * Some qgroup entries are known to be out of date, either because the
+ * configuration has changed in a way that makes a rescan necessary, or
+ * because the fs has been mounted with a non-qgroup-aware version.
+ */
+#define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2)
+
+#define BTRFS_QGROUP_STATUS_VERSION 1
+
+struct btrfs_qgroup_status_item {
+ __le64 version;
+ /*
+ * The generation is updated during every commit. As older
+ * versions of btrfs are not aware of qgroups, it will be
+ * possible to detect inconsistencies by checking the
+ * generation on mount time.
+ */
+ __le64 generation;
+
+ /* Flag definitions see above */
+ __le64 flags;
+
+ /*
+ * Only used during scanning to record the progress of the scan.
+ * It contains a logical address.
+ */
+ __le64 rescan;
+} __attribute__ ((__packed__));
+
+struct btrfs_qgroup_info_item {
+ __le64 generation;
+ __le64 rfer;
+ __le64 rfer_cmpr;
+ __le64 excl;
+ __le64 excl_cmpr;
+} __attribute__ ((__packed__));
+
+/*
+ * Flags definition for qgroup limits
+ *
+ * Used by:
+ * struct btrfs_qgroup_limit.flags
+ * struct btrfs_qgroup_limit_item.flags
+ */
+#define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0)
+#define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1)
+#define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2)
+#define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3)
+#define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4)
+#define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5)
+
+struct btrfs_qgroup_limit_item {
+ /* Only updated when any of the other values change. */
+ __le64 flags;
+ __le64 max_rfer;
+ __le64 max_excl;
+ __le64 rsv_rfer;
+ __le64 rsv_excl;
+} __attribute__ ((__packed__));
+
+/*
+ * Just in case we somehow lose the roots and are not able to mount,
+ * we store an array of the roots from previous transactions in the super.
+ */
+#define BTRFS_NUM_BACKUP_ROOTS 4
+struct btrfs_root_backup {
+ __le64 tree_root;
+ __le64 tree_root_gen;
+
+ __le64 chunk_root;
+ __le64 chunk_root_gen;
+
+ __le64 extent_root;
+ __le64 extent_root_gen;
+
+ __le64 fs_root;
+ __le64 fs_root_gen;
+
+ __le64 dev_root;
+ __le64 dev_root_gen;
+
+ __le64 csum_root;
+ __le64 csum_root_gen;
+
+ __le64 total_bytes;
+ __le64 bytes_used;
+ __le64 num_devices;
+ /* future */
+ __le64 unused_64[4];
+
+ u8 tree_root_level;
+ u8 chunk_root_level;
+ u8 extent_root_level;
+ u8 fs_root_level;
+ u8 dev_root_level;
+ u8 csum_root_level;
+ /* future and to align */
+ u8 unused_8[10];
+} __attribute__ ((__packed__));
+
+/*
+ * This is a very generous portion of the super block, giving us room to
+ * translate 14 chunks with 3 stripes each.
+ */
+#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
+
+#define BTRFS_LABEL_SIZE 256
+
+/* The super block basically lists the main trees of the FS. */
+struct btrfs_super_block {
+ /* The first 4 fields must match struct btrfs_header */
+ u8 csum[BTRFS_CSUM_SIZE];
+ /* FS specific UUID, visible to user */
+ u8 fsid[BTRFS_FSID_SIZE];
+ __le64 bytenr; /* this block number */
+ __le64 flags;
+
+ /* Allowed to be different from the btrfs_header from here own down. */
+ __le64 magic;
+ __le64 generation;
+ __le64 root;
+ __le64 chunk_root;
+ __le64 log_root;
+
+ /* This will help find the new super based on the log root. */
+ __le64 log_root_transid;
+ __le64 total_bytes;
+ __le64 bytes_used;
+ __le64 root_dir_objectid;
+ __le64 num_devices;
+ __le32 sectorsize;
+ __le32 nodesize;
+ __le32 __unused_leafsize;
+ __le32 stripesize;
+ __le32 sys_chunk_array_size;
+ __le64 chunk_root_generation;
+ __le64 compat_flags;
+ __le64 compat_ro_flags;
+ __le64 incompat_flags;
+ __le16 csum_type;
+ u8 root_level;
+ u8 chunk_root_level;
+ u8 log_root_level;
+ struct btrfs_dev_item dev_item;
+
+ char label[BTRFS_LABEL_SIZE];
+
+ __le64 cache_generation;
+ __le64 uuid_tree_generation;
+
+ /* The UUID written into btree blocks */
+ u8 metadata_uuid[BTRFS_FSID_SIZE];
+
+ /* Future expansion */
+ __le64 reserved[28];
+ u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
+ struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
+} __attribute__ ((__packed__));
+
+/*
+ * Feature flags
+ *
+ * Used by:
+ * struct btrfs_super_block::(compat|compat_ro|incompat)_flags
+ * struct btrfs_ioctl_feature_flags
+ */
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE (1ULL << 0)
+
+/*
+ * Older kernels (< 4.9) on big-endian systems produced broken free space tree
+ * bitmaps, and btrfs-progs also used to corrupt the free space tree (versions
+ * < 4.7.3). If this bit is clear, then the free space tree cannot be trusted.
+ * btrfs-progs can also intentionally clear this bit to ask the kernel to
+ * rebuild the free space tree, however this might not work on older kernels
+ * that do not know about this bit. If not sure, clear the cache manually on
+ * first mount when booting older kernel versions.
+ */
+#define BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID (1ULL << 1)
+
+#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
+#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
+#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
+#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
+#define BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD (1ULL << 4)
+
+/*
+ * Older kernels tried to do bigger metadata blocks, but the
+ * code was pretty buggy. Lets not let them try anymore.
+ */
+#define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5)
+
+#define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6)
+#define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7)
+#define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
+#define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
+#define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10)
+#define BTRFS_FEATURE_INCOMPAT_RAID1C34 (1ULL << 11)
+
+/*
+ * Compat flags that we support.
+ *
+ * If any incompat flags are set other than the ones specified below then we
+ * will fail to mount.
+ */
+#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
+#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
+#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
+
+#define BTRFS_FEATURE_COMPAT_RO_SUPP \
+ (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
+ BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
+
+#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
+#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
+
+#define BTRFS_FEATURE_INCOMPAT_SUPP \
+ (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
+ BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
+ BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
+ BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
+ BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
+ BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \
+ BTRFS_FEATURE_INCOMPAT_RAID56 | \
+ BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
+ BTRFS_FEATURE_INCOMPAT_NO_HOLES | \
+ BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \
+ BTRFS_FEATURE_INCOMPAT_RAID1C34)
+
+#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
+ (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
+#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
+
+#define BTRFS_BACKREF_REV_MAX 256
+#define BTRFS_BACKREF_REV_SHIFT 56
+#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
+ BTRFS_BACKREF_REV_SHIFT)
+
+#define BTRFS_OLD_BACKREF_REV 0
+#define BTRFS_MIXED_BACKREF_REV 1
+
+#define BTRFS_MAX_LEVEL 8
+
+/* Every tree block (leaf or node) starts with this header. */
+struct btrfs_header {
+ /* These first four must match the super block */
+ u8 csum[BTRFS_CSUM_SIZE];
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+ __le64 bytenr; /* Which block this node is supposed to live in */
+ __le64 flags;
+
+ /* Allowed to be different from the super from here on down. */
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ __le64 generation;
+ __le64 owner;
+ __le32 nritems;
+ u8 level;
+} __attribute__ ((__packed__));
+
+/*
+ * A leaf is full of items. Offset and size tell us where to find
+ * the item in the leaf (relative to the start of the data area).
+ */
+struct btrfs_item {
+ struct btrfs_disk_key key;
+ __le32 offset;
+ __le32 size;
+} __attribute__ ((__packed__));
+
+/*
+ * leaves have an item area and a data area:
+ * [item0, item1....itemN] [free space] [dataN...data1, data0]
+ *
+ * The data is separate from the items to get the keys closer together
+ * during searches.
+ */
+struct btrfs_leaf {
+ struct btrfs_header header;
+ struct btrfs_item items[];
+} __attribute__ ((__packed__));
+
+/*
+ * All non-leaf blocks are nodes, they hold only keys and pointers to children
+ * blocks.
+ */
+struct btrfs_key_ptr {
+ struct btrfs_disk_key key;
+ __le64 blockptr;
+ __le64 generation;
+} __attribute__ ((__packed__));
+
+struct btrfs_node {
+ struct btrfs_header header;
+ struct btrfs_key_ptr ptrs[];
+} __attribute__ ((__packed__));
+
+#endif /* __BTRFS_TREE_H__ */
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 127b67fd1c89..61155e8918b8 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -75,7 +75,7 @@ u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
*refp = *ref;
if (name) {
- if (ref->name_len > BTRFS_VOL_NAME_MAX) {
+ if (ref->name_len > BTRFS_NAME_LEN) {
printf("%s: volume name too long: %u\n", __func__,
ref->name_len);
goto out;
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index 06e54f331098..dbe92d13cb81 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -14,7 +14,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
struct btrfs_inode_ref iref;
struct btrfs_root root;
u64 dir;
- char tmp[max(BTRFS_VOL_NAME_MAX, BTRFS_NAME_MAX)];
+ char tmp[BTRFS_NAME_LEN];
char *ptr;
ptr = name + max_len - 1;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 02/26] fs: btrfs: Add More checksum algorithm support to btrfs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This would mostly backport crypto/hash.[ch] from btrfs-progs.
The differences are:
- No blake2 support
No blake2 related library in u-boot yet.
- Use uboot xxhash/sha256 directly
No need to implement the code as U-boot has already provided the
interface.
This adds the support for the following csums:
- SHA256
- XXHASH
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 3 ++-
fs/btrfs/btrfs.h | 11 ---------
fs/btrfs/crypto/hash.c | 55 ++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/crypto/hash.h | 17 +++++++++++++
fs/btrfs/dir-item.c | 1 +
fs/btrfs/disk-io.c | 22 +++++++++++++++++
fs/btrfs/disk-io.h | 20 +++++++++++++++
fs/btrfs/hash.c | 38 -----------------------------
fs/btrfs/super.c | 23 +++++++++---------
10 files changed, 130 insertions(+), 62 deletions(-)
create mode 100644 fs/btrfs/crypto/hash.c
create mode 100644 fs/btrfs/crypto/hash.h
create mode 100644 fs/btrfs/disk-io.c
create mode 100644 fs/btrfs/disk-io.h
delete mode 100644 fs/btrfs/hash.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 9b3159296fff..84b3b5ec0e8a 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,4 @@
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o hash.o inode.o root.o subvolume.o super.o
+ extent-io.o inode.o root.o subvolume.o super.o crypto/hash.o disk-io.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 5d3ddd5931f0..012d8afa2f53 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -5,10 +5,11 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
-#include "btrfs.h"
#include <config.h>
#include <malloc.h>
#include <linux/time.h>
+#include "btrfs.h"
+#include "crypto/hash.h"
struct btrfs_info btrfs_info;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 986d07867978..baceea2edb90 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -23,17 +23,6 @@ struct btrfs_info {
extern struct btrfs_info btrfs_info;
-/* hash.c */
-void btrfs_hash_init(void);
-u32 btrfs_crc32c(u32, const void *, size_t);
-u32 btrfs_csum_data(char *, u32, size_t);
-void btrfs_csum_final(u32, void *);
-
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
- return btrfs_crc32c((u32) ~1, name, len);
-}
-
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;
extern disk_partition_t *btrfs_part_info;
diff --git a/fs/btrfs/crypto/hash.c b/fs/btrfs/crypto/hash.c
new file mode 100644
index 000000000000..fb51f6386cb1
--- /dev/null
+++ b/fs/btrfs/crypto/hash.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/xxhash.h>
+#include <linux/unaligned/access_ok.h>
+#include <linux/types.h>
+#include <u-boot/sha256.h>
+#include <u-boot/crc.h>
+
+static u32 btrfs_crc32c_table[256];
+
+void btrfs_hash_init(void)
+{
+ static int inited = 0;
+
+ if (!inited) {
+ crc32c_init(btrfs_crc32c_table, 0x82F63B78);
+ inited = 1;
+ }
+}
+
+int hash_sha256(const u8 *buf, size_t length, u8 *out)
+{
+ sha256_context ctx;
+
+ sha256_starts(&ctx);
+ sha256_update(&ctx, buf, length);
+ sha256_finish(&ctx, out);
+
+ return 0;
+}
+
+int hash_xxhash(const u8 *buf, size_t length, u8 *out)
+{
+ u64 hash;
+
+ hash = xxh64(buf, length, 0);
+ put_unaligned_le64(hash, out);
+
+ return 0;
+}
+
+int hash_crc32c(const u8 *buf, size_t length, u8 *out)
+{
+ u32 crc;
+
+ crc = crc32c_cal((u32)~0, (char *)buf, length, btrfs_crc32c_table);
+ put_unaligned_le32(~crc, out);
+
+ return 0;
+}
+
+u32 crc32c(u32 seed, const void * data, size_t len)
+{
+ return crc32c_cal(seed, data, len, btrfs_crc32c_table);
+}
diff --git a/fs/btrfs/crypto/hash.h b/fs/btrfs/crypto/hash.h
new file mode 100644
index 000000000000..d1ba1fa374e3
--- /dev/null
+++ b/fs/btrfs/crypto/hash.h
@@ -0,0 +1,17 @@
+#ifndef CRYPTO_HASH_H
+#define CRYPTO_HASH_H
+
+#include <linux/types.h>
+
+#define CRYPTO_HASH_SIZE_MAX 32
+
+void btrfs_hash_init(void);
+int hash_crc32c(const u8 *buf, size_t length, u8 *out);
+int hash_xxhash(const u8 *buf, size_t length, u8 *out);
+int hash_sha256(const u8 *buf, size_t length, u8 *out);
+
+u32 crc32c(u32 seed, const void * data, size_t len);
+
+/* Blake2B is not yet supported due to lack of library */
+
+#endif
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 63b5bf0a860f..1ff446a45a85 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -6,6 +6,7 @@
*/
#include "btrfs.h"
+#include "disk-io.h"
static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
new file mode 100644
index 000000000000..58c32b548e50
--- /dev/null
+++ b/fs/btrfs/disk-io.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <fs_internal.h>
+#include "disk-io.h"
+#include "crypto/hash.h"
+
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
+{
+ memset(out, 0, BTRFS_CSUM_SIZE);
+
+ switch (csum_type) {
+ case BTRFS_CSUM_TYPE_CRC32:
+ return hash_crc32c(data, len, out);
+ case BTRFS_CSUM_TYPE_XXHASH:
+ return hash_xxhash(data, len, out);
+ case BTRFS_CSUM_TYPE_SHA256:
+ return hash_sha256(data, len, out);
+ default:
+ printf("Unknown csum type %d\n", csum_type);
+ return -EINVAL;
+ }
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
new file mode 100644
index 000000000000..efb715828cce
--- /dev/null
+++ b/fs/btrfs/disk-io.h
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0+
+#ifndef __BTRFS_DISK_IO_H__
+#define __BTRFS_DISK_IO_H__
+
+#include "crypto/hash.h"
+#include "ctree.h"
+#include "disk-io.h"
+
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+ u32 crc;
+
+ crc = crc32c((u32)~1, (unsigned char *)name, len);
+
+ return (u64)crc;
+}
+
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+
+#endif
diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c
deleted file mode 100644
index 52a8ceaf0c8b..000000000000
--- a/fs/btrfs/hash.c
+++ /dev/null
@@ -1,38 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-#include <u-boot/crc.h>
-#include <asm/unaligned.h>
-
-static u32 btrfs_crc32c_table[256];
-
-void btrfs_hash_init(void)
-{
- static int inited = 0;
-
- if (!inited) {
- crc32c_init(btrfs_crc32c_table, 0x82F63B78);
- inited = 1;
- }
-}
-
-u32 btrfs_crc32c(u32 crc, const void *data, size_t length)
-{
- return crc32c_cal(crc, (const char *) data, length,
- btrfs_crc32c_table);
-}
-
-u32 btrfs_csum_data(char *data, u32 seed, size_t len)
-{
- return btrfs_crc32c(seed, data, len);
-}
-
-void btrfs_csum_final(u32 crc, void *result)
-{
- put_unaligned(cpu_to_le32(~crc), (u32 *)result);
-}
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2dc4a6fcd7a3..7891d84ed369 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -6,6 +6,7 @@
*/
#include "btrfs.h"
+#include "disk-io.h"
#include <memalign.h>
#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN \
@@ -57,19 +58,19 @@ static int btrfs_check_super_csum(char *raw_disk_sb)
(struct btrfs_super_block *) raw_disk_sb;
u16 csum_type = le16_to_cpu(disk_sb->csum_type);
- if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
- u32 crc = ~(u32) 0;
- const int csum_size = sizeof(crc);
- char result[csum_size];
+ if (csum_type == BTRFS_CSUM_TYPE_CRC32 ||
+ csum_type == BTRFS_CSUM_TYPE_SHA256 ||
+ csum_type == BTRFS_CSUM_TYPE_XXHASH) {
+ u8 result[BTRFS_CSUM_SIZE];
- crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE, crc,
- BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- btrfs_csum_final(crc, result);
+ btrfs_csum_data(csum_type, (u8 *)raw_disk_sb + BTRFS_CSUM_SIZE,
+ result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- if (memcmp(raw_disk_sb, result, csum_size))
- return -1;
- } else {
- return -1;
+ if (memcmp(raw_disk_sb, result, BTRFS_CSUM_SIZE))
+ return -EIO;
+ } else if (csum_type == BTRFS_CSUM_TYPE_BLAKE2){
+ printf("Blake2 csum type is not supported yet\n");
+ return -ENOTSUPP;
}
return 0;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 02/26] fs: btrfs: Add More checksum algorithm support to btrfs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This would mostly backport crypto/hash.[ch] from btrfs-progs.
The differences are:
- No blake2 support
No blake2 related library in u-boot yet.
- Use uboot xxhash/sha256 directly
No need to implement the code as U-boot has already provided the
interface.
This adds the support for the following csums:
- SHA256
- XXHASH
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 3 ++-
fs/btrfs/btrfs.h | 11 ---------
fs/btrfs/crypto/hash.c | 55 ++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/crypto/hash.h | 17 +++++++++++++
fs/btrfs/dir-item.c | 1 +
fs/btrfs/disk-io.c | 22 +++++++++++++++++
fs/btrfs/disk-io.h | 20 +++++++++++++++
fs/btrfs/hash.c | 38 -----------------------------
fs/btrfs/super.c | 23 +++++++++---------
10 files changed, 130 insertions(+), 62 deletions(-)
create mode 100644 fs/btrfs/crypto/hash.c
create mode 100644 fs/btrfs/crypto/hash.h
create mode 100644 fs/btrfs/disk-io.c
create mode 100644 fs/btrfs/disk-io.h
delete mode 100644 fs/btrfs/hash.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 9b3159296fff..84b3b5ec0e8a 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,4 @@
# 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o hash.o inode.o root.o subvolume.o super.o
+ extent-io.o inode.o root.o subvolume.o super.o crypto/hash.o disk-io.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 5d3ddd5931f0..012d8afa2f53 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -5,10 +5,11 @@
* 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
*/
-#include "btrfs.h"
#include <config.h>
#include <malloc.h>
#include <linux/time.h>
+#include "btrfs.h"
+#include "crypto/hash.h"
struct btrfs_info btrfs_info;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 986d07867978..baceea2edb90 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -23,17 +23,6 @@ struct btrfs_info {
extern struct btrfs_info btrfs_info;
-/* hash.c */
-void btrfs_hash_init(void);
-u32 btrfs_crc32c(u32, const void *, size_t);
-u32 btrfs_csum_data(char *, u32, size_t);
-void btrfs_csum_final(u32, void *);
-
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
- return btrfs_crc32c((u32) ~1, name, len);
-}
-
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;
extern disk_partition_t *btrfs_part_info;
diff --git a/fs/btrfs/crypto/hash.c b/fs/btrfs/crypto/hash.c
new file mode 100644
index 000000000000..fb51f6386cb1
--- /dev/null
+++ b/fs/btrfs/crypto/hash.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/xxhash.h>
+#include <linux/unaligned/access_ok.h>
+#include <linux/types.h>
+#include <u-boot/sha256.h>
+#include <u-boot/crc.h>
+
+static u32 btrfs_crc32c_table[256];
+
+void btrfs_hash_init(void)
+{
+ static int inited = 0;
+
+ if (!inited) {
+ crc32c_init(btrfs_crc32c_table, 0x82F63B78);
+ inited = 1;
+ }
+}
+
+int hash_sha256(const u8 *buf, size_t length, u8 *out)
+{
+ sha256_context ctx;
+
+ sha256_starts(&ctx);
+ sha256_update(&ctx, buf, length);
+ sha256_finish(&ctx, out);
+
+ return 0;
+}
+
+int hash_xxhash(const u8 *buf, size_t length, u8 *out)
+{
+ u64 hash;
+
+ hash = xxh64(buf, length, 0);
+ put_unaligned_le64(hash, out);
+
+ return 0;
+}
+
+int hash_crc32c(const u8 *buf, size_t length, u8 *out)
+{
+ u32 crc;
+
+ crc = crc32c_cal((u32)~0, (char *)buf, length, btrfs_crc32c_table);
+ put_unaligned_le32(~crc, out);
+
+ return 0;
+}
+
+u32 crc32c(u32 seed, const void * data, size_t len)
+{
+ return crc32c_cal(seed, data, len, btrfs_crc32c_table);
+}
diff --git a/fs/btrfs/crypto/hash.h b/fs/btrfs/crypto/hash.h
new file mode 100644
index 000000000000..d1ba1fa374e3
--- /dev/null
+++ b/fs/btrfs/crypto/hash.h
@@ -0,0 +1,17 @@
+#ifndef CRYPTO_HASH_H
+#define CRYPTO_HASH_H
+
+#include <linux/types.h>
+
+#define CRYPTO_HASH_SIZE_MAX 32
+
+void btrfs_hash_init(void);
+int hash_crc32c(const u8 *buf, size_t length, u8 *out);
+int hash_xxhash(const u8 *buf, size_t length, u8 *out);
+int hash_sha256(const u8 *buf, size_t length, u8 *out);
+
+u32 crc32c(u32 seed, const void * data, size_t len);
+
+/* Blake2B is not yet supported due to lack of library */
+
+#endif
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 63b5bf0a860f..1ff446a45a85 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -6,6 +6,7 @@
*/
#include "btrfs.h"
+#include "disk-io.h"
static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
new file mode 100644
index 000000000000..58c32b548e50
--- /dev/null
+++ b/fs/btrfs/disk-io.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <common.h>
+#include <fs_internal.h>
+#include "disk-io.h"
+#include "crypto/hash.h"
+
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
+{
+ memset(out, 0, BTRFS_CSUM_SIZE);
+
+ switch (csum_type) {
+ case BTRFS_CSUM_TYPE_CRC32:
+ return hash_crc32c(data, len, out);
+ case BTRFS_CSUM_TYPE_XXHASH:
+ return hash_xxhash(data, len, out);
+ case BTRFS_CSUM_TYPE_SHA256:
+ return hash_sha256(data, len, out);
+ default:
+ printf("Unknown csum type %d\n", csum_type);
+ return -EINVAL;
+ }
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
new file mode 100644
index 000000000000..efb715828cce
--- /dev/null
+++ b/fs/btrfs/disk-io.h
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0+
+#ifndef __BTRFS_DISK_IO_H__
+#define __BTRFS_DISK_IO_H__
+
+#include "crypto/hash.h"
+#include "ctree.h"
+#include "disk-io.h"
+
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+ u32 crc;
+
+ crc = crc32c((u32)~1, (unsigned char *)name, len);
+
+ return (u64)crc;
+}
+
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+
+#endif
diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c
deleted file mode 100644
index 52a8ceaf0c8b..000000000000
--- a/fs/btrfs/hash.c
+++ /dev/null
@@ -1,38 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
- */
-
-#include "btrfs.h"
-#include <u-boot/crc.h>
-#include <asm/unaligned.h>
-
-static u32 btrfs_crc32c_table[256];
-
-void btrfs_hash_init(void)
-{
- static int inited = 0;
-
- if (!inited) {
- crc32c_init(btrfs_crc32c_table, 0x82F63B78);
- inited = 1;
- }
-}
-
-u32 btrfs_crc32c(u32 crc, const void *data, size_t length)
-{
- return crc32c_cal(crc, (const char *) data, length,
- btrfs_crc32c_table);
-}
-
-u32 btrfs_csum_data(char *data, u32 seed, size_t len)
-{
- return btrfs_crc32c(seed, data, len);
-}
-
-void btrfs_csum_final(u32 crc, void *result)
-{
- put_unaligned(cpu_to_le32(~crc), (u32 *)result);
-}
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2dc4a6fcd7a3..7891d84ed369 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -6,6 +6,7 @@
*/
#include "btrfs.h"
+#include "disk-io.h"
#include <memalign.h>
#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN \
@@ -57,19 +58,19 @@ static int btrfs_check_super_csum(char *raw_disk_sb)
(struct btrfs_super_block *) raw_disk_sb;
u16 csum_type = le16_to_cpu(disk_sb->csum_type);
- if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
- u32 crc = ~(u32) 0;
- const int csum_size = sizeof(crc);
- char result[csum_size];
+ if (csum_type == BTRFS_CSUM_TYPE_CRC32 ||
+ csum_type == BTRFS_CSUM_TYPE_SHA256 ||
+ csum_type == BTRFS_CSUM_TYPE_XXHASH) {
+ u8 result[BTRFS_CSUM_SIZE];
- crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE, crc,
- BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- btrfs_csum_final(crc, result);
+ btrfs_csum_data(csum_type, (u8 *)raw_disk_sb + BTRFS_CSUM_SIZE,
+ result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- if (memcmp(raw_disk_sb, result, csum_size))
- return -1;
- } else {
- return -1;
+ if (memcmp(raw_disk_sb, result, BTRFS_CSUM_SIZE))
+ return -EIO;
+ } else if (csum_type == BTRFS_CSUM_TYPE_BLAKE2){
+ printf("Blake2 csum type is not supported yet\n");
+ return -ENOTSUPP;
}
return 0;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This patch will use generic code shared from btrfs-progs to read one
super block from block device.
To support the btrfs-progs style code, the following codes are also
cross-ported:
- BTRFS_SETGET_FUNC for btrfs_super_block
- btrfs_check_super() function
- Move btrfs_read_superblock() to disk-io.[ch]
Since super.c only contains pretty small amount of code, and
the extra check will be covered in later root read patches.
The different between this implementation from btrfs-progs are:
- No sbflags/sb_bytenr support
Since we only need to read the primary super block (like kernel), thus
sbflags/sb_bytenr used by super block recovery is not needed.
Also, this changes the following behavior of U-boot btrfs:
- Only reads the primary super block
The old implementation will read all 3 super blocks, with one
non-existing backup super.
This is not correct, especially for fs created after btrfs.
Just like kernel, we only check the primary super block.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 1 +
fs/btrfs/compat.h | 56 ++++++++++
fs/btrfs/ctree.c | 32 ++++++
fs/btrfs/ctree.h | 67 ++++++++++++
fs/btrfs/disk-io.c | 213 ++++++++++++++++++++++++++++++++++++++
fs/btrfs/disk-io.h | 7 ++
fs/btrfs/super.c | 247 ---------------------------------------------
8 files changed, 377 insertions(+), 248 deletions(-)
create mode 100644 fs/btrfs/compat.h
delete mode 100644 fs/btrfs/super.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 84b3b5ec0e8a..bd4b848d1b1f 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,4 @@
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o super.o crypto/hash.o disk-io.o
+ extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 012d8afa2f53..ec993a193106 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -10,6 +10,7 @@
#include <linux/time.h>
#include "btrfs.h"
#include "crypto/hash.h"
+#include "disk-io.h"
struct btrfs_info btrfs_info;
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
new file mode 100644
index 000000000000..376a035cd6db
--- /dev/null
+++ b/fs/btrfs/compat.h
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef __BTRFS_COMPAT_H__
+#define __BTRFS_COMPAT_H__
+
+#include <linux/errno.h>
+#include <fs_internal.h>
+#include <uuid.h>
+
+/* Provide a compatibility layer to make code syncing easier */
+
+/* A simple wraper to for error() from btrfs-progs */
+#define error(...) { printf(__VA_ARGS__); printf("\n"); }
+
+#define BTRFS_UUID_UNPARSED_SIZE 37
+
+/*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+/*
+ * Read data from device specified by @desc and @part
+ *
+ * U-boot equivalent of pread().
+ *
+ * Return the bytes of data read.
+ * Return <0 for error.
+ */
+static inline int __btrfs_devread(struct blk_desc *desc, disk_partition_t *part,
+ void *buf, size_t size, u64 offset)
+{
+ lbaint_t sector;
+ int byte_offset;
+ int ret;
+
+ sector = offset >> desc->log2blksz;
+ byte_offset = offset % desc->blksz;
+
+ /* fs_devread() return 0 for error, >0 for success */
+ ret = fs_devread(desc, part, sector, byte_offset, size, buf);
+ if (!ret)
+ return -EIO;
+ return size;
+}
+
+static inline void uuid_unparse(const u8 *uuid, char *out)
+{
+ return uuid_bin_to_str((unsigned char *)uuid, out, 0);
+}
+
+#endif
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 7fae383f1509..bdf8e18fd3ee 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -9,6 +9,38 @@
#include <malloc.h>
#include <memalign.h>
+static const struct btrfs_csum {
+ u16 size;
+ const char name[14];
+} btrfs_csums[] = {
+ [BTRFS_CSUM_TYPE_CRC32] = { 4, "crc32c" },
+ [BTRFS_CSUM_TYPE_XXHASH] = { 8, "xxhash64" },
+ [BTRFS_CSUM_TYPE_SHA256] = { 32, "sha256" },
+ [BTRFS_CSUM_TYPE_BLAKE2] = { 32, "blake2" },
+};
+
+u16 btrfs_super_csum_size(const struct btrfs_super_block *sb)
+{
+ const u16 csum_type = btrfs_super_csum_type(sb);
+
+ return btrfs_csums[csum_type].size;
+}
+
+const char *btrfs_super_csum_name(u16 csum_type)
+{
+ return btrfs_csums[csum_type].name;
+}
+
+size_t btrfs_super_num_csums(void)
+{
+ return ARRAY_SIZE(btrfs_csums);
+}
+
+u16 btrfs_csum_type_size(u16 csum_type)
+{
+ return btrfs_csums[csum_type].size;
+}
+
int btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 156ce69ed022..02125e5e100c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -12,6 +12,7 @@
#include <common.h>
#include <compiler.h>
#include "kernel-shared/btrfs_tree.h"
+#include "compat.h"
#define BTRFS_MAX_MIRRORS 3
@@ -47,6 +48,16 @@
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
+#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const type *s) \
+{ \
+ return le##bits##_to_cpu(s->member); \
+} \
+static inline void btrfs_set_##name(type *s, u##bits val) \
+{ \
+ s->member = cpu_to_le##bits(val); \
+}
+
union btrfs_tree_node {
struct btrfs_header header;
struct btrfs_leaf leaf;
@@ -122,4 +133,60 @@ static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
#define btrfs_path_item_ptr(p,t) \
((t *) btrfs_path_leaf_data((p)))
+u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
+const char *btrfs_super_csum_name(u16 csum_type);
+u16 btrfs_csum_type_size(u16 csum_type);
+size_t btrfs_super_num_csums(void);
+
+/* struct btrfs_super_block */
+
+BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
+ struct btrfs_super_block, sys_chunk_array_size, 32);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
+ struct btrfs_super_block, chunk_root_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
+ root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
+ chunk_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
+ chunk_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
+ log_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
+ log_root_transid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
+ log_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
+ sectorsize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
+ nodesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
+ stripesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
+ root_dir_objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
+ num_devices, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
+ compat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
+ compat_ro_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
+ incompat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
+ csum_type, 16);
+BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
+ cache_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
+ uuid_tree_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 58c32b548e50..819068b936ec 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1,7 +1,12 @@
// SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <fs_internal.h>
+#include <uuid.h>
+#include <memalign.h>
+#include "kernel-shared/btrfs_tree.h"
#include "disk-io.h"
+#include "ctree.h"
+#include "btrfs.h"
#include "crypto/hash.h"
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
@@ -20,3 +25,211 @@ int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
return -EINVAL;
}
}
+
+/*
+ * Check if the super is valid:
+ * - nodesize/sectorsize - minimum, maximum, alignment
+ * - tree block starts - alignment
+ * - number of devices - something sane
+ * - sys array size - maximum
+ */
+static int btrfs_check_super(struct btrfs_super_block *sb)
+{
+ u8 result[BTRFS_CSUM_SIZE];
+ u16 csum_type;
+ int csum_size;
+ u8 *metadata_uuid;
+
+ if (btrfs_super_magic(sb) != BTRFS_MAGIC)
+ return -EIO;
+
+ csum_type = btrfs_super_csum_type(sb);
+ if (csum_type >= btrfs_super_num_csums()) {
+ error("unsupported checksum algorithm %u", csum_type);
+ return -EIO;
+ }
+ csum_size = btrfs_super_csum_size(sb);
+
+ btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
+ result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+
+ if (memcmp(result, sb->csum, csum_size)) {
+ error("superblock checksum mismatch");
+ return -EIO;
+ }
+ if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("tree_root level too big: %d >= %d",
+ btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+ if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("chunk_root level too big: %d >= %d",
+ btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+ if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("log_root level too big: %d >= %d",
+ btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+
+ if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
+ error("tree_root block unaligned: %llu", btrfs_super_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
+ error("chunk_root block unaligned: %llu",
+ btrfs_super_chunk_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
+ error("log_root block unaligned: %llu",
+ btrfs_super_log_root(sb));
+ goto error_out;
+ }
+ if (btrfs_super_nodesize(sb) < 4096) {
+ error("nodesize too small: %u < 4096",
+ btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
+ error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_sectorsize(sb) < 4096) {
+ error("sectorsize too small: %u < 4096",
+ btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
+ error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_total_bytes(sb) == 0) {
+ error("invalid total_bytes 0");
+ goto error_out;
+ }
+ if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
+ error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
+ goto error_out;
+ }
+ if ((btrfs_super_stripesize(sb) != 4096)
+ && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
+ error("invalid stripesize %u", btrfs_super_stripesize(sb));
+ goto error_out;
+ }
+
+ if (btrfs_super_incompat_flags(sb) & BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
+ metadata_uuid = sb->metadata_uuid;
+ else
+ metadata_uuid = sb->fsid;
+
+ if (memcmp(metadata_uuid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
+ char fsid[BTRFS_UUID_UNPARSED_SIZE];
+ char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
+
+ uuid_unparse(sb->metadata_uuid, fsid);
+ uuid_unparse(sb->dev_item.fsid, dev_fsid);
+ error("dev_item UUID does not match fsid: %s != %s",
+ dev_fsid, fsid);
+ goto error_out;
+ }
+
+ /*
+ * Hint to catch really bogus numbers, bitflips or so
+ */
+ if (btrfs_super_num_devices(sb) > (1UL << 31)) {
+ error("suspicious number of devices: %llu",
+ btrfs_super_num_devices(sb));
+ }
+
+ if (btrfs_super_num_devices(sb) == 0) {
+ error("number of devices is 0");
+ goto error_out;
+ }
+
+ /*
+ * Obvious sys_chunk_array corruptions, it must hold at least one key
+ * and one chunk
+ */
+ if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
+ error("system chunk array too big %u > %u",
+ btrfs_super_sys_array_size(sb),
+ BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
+ goto error_out;
+ }
+ if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
+ + sizeof(struct btrfs_chunk)) {
+ error("system chunk array too small %u < %zu",
+ btrfs_super_sys_array_size(sb),
+ sizeof(struct btrfs_disk_key) +
+ sizeof(struct btrfs_chunk));
+ goto error_out;
+ }
+
+ return 0;
+
+error_out:
+ error("superblock checksum matches but it has invalid members");
+ return -EIO;
+}
+
+/*
+ * btrfs_read_dev_super - read a valid primary superblock from a block device
+ * @desc,@part: file descriptor of the device
+ * @sb: buffer where the superblock is going to be read in
+ *
+ * Unlike the btrfs-progs/kernel version, here we ony care about the first
+ * super block, thus it's much simpler.
+ */
+int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_super_block *sb)
+{
+ char tmp[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
+ int ret;
+
+ ret = __btrfs_devread(desc, part, tmp, BTRFS_SUPER_INFO_SIZE,
+ BTRFS_SUPER_INFO_OFFSET);
+ if (ret < BTRFS_SUPER_INFO_SIZE)
+ return -EIO;
+
+ if (btrfs_super_bytenr(buf) != BTRFS_SUPER_INFO_OFFSET)
+ return -EIO;
+
+ if (btrfs_check_super(buf))
+ return -EIO;
+
+ memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
+ return 0;
+}
+
+int btrfs_read_superblock(void)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
+ struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
+ int ret;
+
+
+ btrfs_info.sb.generation = 0;
+
+ ret = btrfs_read_dev_super(btrfs_blk_desc, btrfs_part_info, sb);
+ if (ret < 0) {
+ debug("%s: No valid BTRFS superblock found!\n", __func__);
+ return ret;
+ }
+ btrfs_super_block_to_cpu(sb);
+ memcpy(&btrfs_info.sb, sb, sizeof(*sb));
+
+ if (btrfs_info.sb.num_devices != 1) {
+ printf("%s: Unsupported number of devices (%lli). This driver "
+ "only supports filesystem on one device.\n", __func__,
+ btrfs_info.sb.num_devices);
+ return -1;
+ }
+
+ debug("Chosen superblock with generation = %llu\n",
+ btrfs_info.sb.generation);
+
+ return 0;
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index efb715828cce..671f1ac55c68 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -2,10 +2,14 @@
#ifndef __BTRFS_DISK_IO_H__
#define __BTRFS_DISK_IO_H__
+#include <linux/sizes.h>
+#include <fs_internal.h>
#include "crypto/hash.h"
#include "ctree.h"
#include "disk-io.h"
+#define BTRFS_SUPER_INFO_OFFSET SZ_64K
+#define BTRFS_SUPER_INFO_SIZE SZ_4K
static inline u64 btrfs_name_hash(const char *name, int len)
{
u32 crc;
@@ -17,4 +21,7 @@ static inline u64 btrfs_name_hash(const char *name, int len)
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_super_block *sb);
+int btrfs_read_superblock(void);
#endif
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
deleted file mode 100644
index 7891d84ed369..000000000000
--- a/fs/btrfs/super.c
+++ /dev/null
@@ -1,247 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-#include "disk-io.h"
-#include <memalign.h>
-
-#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN \
- | BTRFS_HEADER_FLAG_RELOC \
- | BTRFS_SUPER_FLAG_ERROR \
- | BTRFS_SUPER_FLAG_SEEDING \
- | BTRFS_SUPER_FLAG_METADUMP)
-
-#define BTRFS_SUPER_INFO_SIZE 4096
-
-/*
- * checks if a valid root backup is present.
- * considers the case when all root backups empty valid.
- * returns -1 in case of invalid root backup and 0 for valid.
- */
-static int btrfs_check_super_roots(struct btrfs_super_block *sb)
-{
- struct btrfs_root_backup *root_backup;
- int i, newest = -1;
- int num_empty = 0;
-
- for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; ++i) {
- root_backup = sb->super_roots + i;
-
- if (root_backup->tree_root == 0 && root_backup->tree_root_gen == 0)
- num_empty++;
-
- if (root_backup->tree_root_gen == sb->generation)
- newest = i;
- }
-
- if (num_empty == BTRFS_NUM_BACKUP_ROOTS) {
- return 0;
- } else if (newest >= 0) {
- return 0;
- }
-
- return -1;
-}
-
-static inline int is_power_of_2(u64 x)
-{
- return !(x & (x - 1));
-}
-
-static int btrfs_check_super_csum(char *raw_disk_sb)
-{
- struct btrfs_super_block *disk_sb =
- (struct btrfs_super_block *) raw_disk_sb;
- u16 csum_type = le16_to_cpu(disk_sb->csum_type);
-
- if (csum_type == BTRFS_CSUM_TYPE_CRC32 ||
- csum_type == BTRFS_CSUM_TYPE_SHA256 ||
- csum_type == BTRFS_CSUM_TYPE_XXHASH) {
- u8 result[BTRFS_CSUM_SIZE];
-
- btrfs_csum_data(csum_type, (u8 *)raw_disk_sb + BTRFS_CSUM_SIZE,
- result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
-
- if (memcmp(raw_disk_sb, result, BTRFS_CSUM_SIZE))
- return -EIO;
- } else if (csum_type == BTRFS_CSUM_TYPE_BLAKE2){
- printf("Blake2 csum type is not supported yet\n");
- return -ENOTSUPP;
- }
-
- return 0;
-}
-
-static int btrfs_check_super(struct btrfs_super_block *sb)
-{
- int ret = 0;
-
- if (sb->flags & ~BTRFS_SUPER_FLAG_SUPP) {
- printf("%s: Unsupported flags: %llu\n", __func__,
- sb->flags & ~BTRFS_SUPER_FLAG_SUPP);
- }
-
- if (sb->root_level > BTRFS_MAX_LEVEL) {
- printf("%s: tree_root level too big: %d >= %d\n", __func__,
- sb->root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->chunk_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: chunk_root level too big: %d >= %d\n", __func__,
- sb->chunk_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->log_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: log_root level too big: %d >= %d\n", __func__,
- sb->log_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->sectorsize) || sb->sectorsize < 4096 ||
- sb->sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid sectorsize %u\n", __func__,
- sb->sectorsize);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->nodesize) || sb->nodesize < sb->sectorsize ||
- sb->nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid nodesize %u\n", __func__, sb->nodesize);
- ret = -1;
- }
-
- if (sb->nodesize != sb->__unused_leafsize) {
- printf("%s: invalid leafsize %u, should be %u\n", __func__,
- sb->__unused_leafsize, sb->nodesize);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->root, sb->sectorsize)) {
- printf("%s: tree_root block unaligned: %llu\n", __func__,
- sb->root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->chunk_root, sb->sectorsize)) {
- printf("%s: chunk_root block unaligned: %llu\n", __func__,
- sb->chunk_root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->log_root, sb->sectorsize)) {
- printf("%s: log_root block unaligned: %llu\n", __func__,
- sb->log_root);
- ret = -1;
- }
-
- if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
- printf("%s: dev_item UUID does not match fsid\n", __func__);
- ret = -1;
- }
-
- if (sb->bytes_used < 6*sb->nodesize) {
- printf("%s: bytes_used is too small %llu\n", __func__,
- sb->bytes_used);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->stripesize)) {
- printf("%s: invalid stripesize %u\n", __func__, sb->stripesize);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
- printf("%s: system chunk array too big %u > %u\n", __func__,
- sb->sys_chunk_array_size, BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size < sizeof(struct btrfs_key) +
- sizeof(struct btrfs_chunk)) {
- printf("%s: system chunk array too small %u < %zu\n", __func__,
- sb->sys_chunk_array_size, sizeof(struct btrfs_key)
- + sizeof(struct btrfs_chunk));
- ret = -1;
- }
-
- return ret;
-}
-
-int btrfs_read_superblock(void)
-{
- const u64 superblock_offsets[4] = {
- 0x10000ull,
- 0x4000000ull,
- 0x4000000000ull,
- 0x4000000000000ull
- };
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- u64 dev_total_bytes;
- int i;
-
- dev_total_bytes = (u64) btrfs_part_info->size * btrfs_part_info->blksz;
-
- btrfs_info.sb.generation = 0;
-
- for (i = 0; i < 4; ++i) {
- if (superblock_offsets[i] + sizeof(sb) > dev_total_bytes)
- break;
-
- if (!btrfs_devread(superblock_offsets[i], BTRFS_SUPER_INFO_SIZE,
- raw_sb))
- break;
-
- if (btrfs_check_super_csum(raw_sb)) {
- debug("%s: invalid checksum at superblock mirror %i\n",
- __func__, i);
- continue;
- }
-
- btrfs_super_block_to_cpu(sb);
-
- if (sb->magic != BTRFS_MAGIC) {
- debug("%s: invalid BTRFS magic 0x%016llX at "
- "superblock mirror %i\n", __func__, sb->magic, i);
- } else if (sb->bytenr != superblock_offsets[i]) {
- printf("%s: invalid bytenr 0x%016llX (expected "
- "0x%016llX) at superblock mirror %i\n",
- __func__, sb->bytenr, superblock_offsets[i], i);
- } else if (btrfs_check_super(sb)) {
- printf("%s: Checking superblock mirror %i failed\n",
- __func__, i);
- } else if (sb->generation > btrfs_info.sb.generation) {
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
- } else {
- /* Nothing */
- }
- }
-
- if (!btrfs_info.sb.generation) {
- debug("%s: No valid BTRFS superblock found!\n", __func__);
- return -1;
- }
-
- if (btrfs_check_super_roots(&btrfs_info.sb)) {
- printf("%s: No valid root_backup found!\n", __func__);
- return -1;
- }
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This patch will use generic code shared from btrfs-progs to read one
super block from block device.
To support the btrfs-progs style code, the following codes are also
cross-ported:
- BTRFS_SETGET_FUNC for btrfs_super_block
- btrfs_check_super() function
- Move btrfs_read_superblock() to disk-io.[ch]
Since super.c only contains pretty small amount of code, and
the extra check will be covered in later root read patches.
The different between this implementation from btrfs-progs are:
- No sbflags/sb_bytenr support
Since we only need to read the primary super block (like kernel), thus
sbflags/sb_bytenr used by super block recovery is not needed.
Also, this changes the following behavior of U-boot btrfs:
- Only reads the primary super block
The old implementation will read all 3 super blocks, with one
non-existing backup super.
This is not correct, especially for fs created after btrfs.
Just like kernel, we only check the primary super block.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 1 +
fs/btrfs/compat.h | 56 ++++++++++
fs/btrfs/ctree.c | 32 ++++++
fs/btrfs/ctree.h | 67 ++++++++++++
fs/btrfs/disk-io.c | 213 ++++++++++++++++++++++++++++++++++++++
fs/btrfs/disk-io.h | 7 ++
fs/btrfs/super.c | 247 ---------------------------------------------
8 files changed, 377 insertions(+), 248 deletions(-)
create mode 100644 fs/btrfs/compat.h
delete mode 100644 fs/btrfs/super.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 84b3b5ec0e8a..bd4b848d1b1f 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,4 @@
# 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o super.o crypto/hash.o disk-io.o
+ extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 012d8afa2f53..ec993a193106 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -10,6 +10,7 @@
#include <linux/time.h>
#include "btrfs.h"
#include "crypto/hash.h"
+#include "disk-io.h"
struct btrfs_info btrfs_info;
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
new file mode 100644
index 000000000000..376a035cd6db
--- /dev/null
+++ b/fs/btrfs/compat.h
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef __BTRFS_COMPAT_H__
+#define __BTRFS_COMPAT_H__
+
+#include <linux/errno.h>
+#include <fs_internal.h>
+#include <uuid.h>
+
+/* Provide a compatibility layer to make code syncing easier */
+
+/* A simple wraper to for error() from btrfs-progs */
+#define error(...) { printf(__VA_ARGS__); printf("\n"); }
+
+#define BTRFS_UUID_UNPARSED_SIZE 37
+
+/*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+/*
+ * Read data from device specified by @desc and @part
+ *
+ * U-boot equivalent of pread().
+ *
+ * Return the bytes of data read.
+ * Return <0 for error.
+ */
+static inline int __btrfs_devread(struct blk_desc *desc, disk_partition_t *part,
+ void *buf, size_t size, u64 offset)
+{
+ lbaint_t sector;
+ int byte_offset;
+ int ret;
+
+ sector = offset >> desc->log2blksz;
+ byte_offset = offset % desc->blksz;
+
+ /* fs_devread() return 0 for error, >0 for success */
+ ret = fs_devread(desc, part, sector, byte_offset, size, buf);
+ if (!ret)
+ return -EIO;
+ return size;
+}
+
+static inline void uuid_unparse(const u8 *uuid, char *out)
+{
+ return uuid_bin_to_str((unsigned char *)uuid, out, 0);
+}
+
+#endif
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 7fae383f1509..bdf8e18fd3ee 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -9,6 +9,38 @@
#include <malloc.h>
#include <memalign.h>
+static const struct btrfs_csum {
+ u16 size;
+ const char name[14];
+} btrfs_csums[] = {
+ [BTRFS_CSUM_TYPE_CRC32] = { 4, "crc32c" },
+ [BTRFS_CSUM_TYPE_XXHASH] = { 8, "xxhash64" },
+ [BTRFS_CSUM_TYPE_SHA256] = { 32, "sha256" },
+ [BTRFS_CSUM_TYPE_BLAKE2] = { 32, "blake2" },
+};
+
+u16 btrfs_super_csum_size(const struct btrfs_super_block *sb)
+{
+ const u16 csum_type = btrfs_super_csum_type(sb);
+
+ return btrfs_csums[csum_type].size;
+}
+
+const char *btrfs_super_csum_name(u16 csum_type)
+{
+ return btrfs_csums[csum_type].name;
+}
+
+size_t btrfs_super_num_csums(void)
+{
+ return ARRAY_SIZE(btrfs_csums);
+}
+
+u16 btrfs_csum_type_size(u16 csum_type)
+{
+ return btrfs_csums[csum_type].size;
+}
+
int btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 156ce69ed022..02125e5e100c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -12,6 +12,7 @@
#include <common.h>
#include <compiler.h>
#include "kernel-shared/btrfs_tree.h"
+#include "compat.h"
#define BTRFS_MAX_MIRRORS 3
@@ -47,6 +48,16 @@
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
+#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const type *s) \
+{ \
+ return le##bits##_to_cpu(s->member); \
+} \
+static inline void btrfs_set_##name(type *s, u##bits val) \
+{ \
+ s->member = cpu_to_le##bits(val); \
+}
+
union btrfs_tree_node {
struct btrfs_header header;
struct btrfs_leaf leaf;
@@ -122,4 +133,60 @@ static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
#define btrfs_path_item_ptr(p,t) \
((t *) btrfs_path_leaf_data((p)))
+u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
+const char *btrfs_super_csum_name(u16 csum_type);
+u16 btrfs_csum_type_size(u16 csum_type);
+size_t btrfs_super_num_csums(void);
+
+/* struct btrfs_super_block */
+
+BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
+ struct btrfs_super_block, sys_chunk_array_size, 32);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
+ struct btrfs_super_block, chunk_root_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
+ root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
+ chunk_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
+ chunk_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
+ log_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
+ log_root_transid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
+ log_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
+ sectorsize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
+ nodesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
+ stripesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
+ root_dir_objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
+ num_devices, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
+ compat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
+ compat_ro_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
+ incompat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
+ csum_type, 16);
+BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
+ cache_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
+ uuid_tree_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 58c32b548e50..819068b936ec 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1,7 +1,12 @@
// SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <fs_internal.h>
+#include <uuid.h>
+#include <memalign.h>
+#include "kernel-shared/btrfs_tree.h"
#include "disk-io.h"
+#include "ctree.h"
+#include "btrfs.h"
#include "crypto/hash.h"
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
@@ -20,3 +25,211 @@ int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
return -EINVAL;
}
}
+
+/*
+ * Check if the super is valid:
+ * - nodesize/sectorsize - minimum, maximum, alignment
+ * - tree block starts - alignment
+ * - number of devices - something sane
+ * - sys array size - maximum
+ */
+static int btrfs_check_super(struct btrfs_super_block *sb)
+{
+ u8 result[BTRFS_CSUM_SIZE];
+ u16 csum_type;
+ int csum_size;
+ u8 *metadata_uuid;
+
+ if (btrfs_super_magic(sb) != BTRFS_MAGIC)
+ return -EIO;
+
+ csum_type = btrfs_super_csum_type(sb);
+ if (csum_type >= btrfs_super_num_csums()) {
+ error("unsupported checksum algorithm %u", csum_type);
+ return -EIO;
+ }
+ csum_size = btrfs_super_csum_size(sb);
+
+ btrfs_csum_data(csum_type, (u8 *)sb + BTRFS_CSUM_SIZE,
+ result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+
+ if (memcmp(result, sb->csum, csum_size)) {
+ error("superblock checksum mismatch");
+ return -EIO;
+ }
+ if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("tree_root level too big: %d >= %d",
+ btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+ if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("chunk_root level too big: %d >= %d",
+ btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+ if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
+ error("log_root level too big: %d >= %d",
+ btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
+ goto error_out;
+ }
+
+ if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) {
+ error("tree_root block unaligned: %llu", btrfs_super_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) {
+ error("chunk_root block unaligned: %llu",
+ btrfs_super_chunk_root(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) {
+ error("log_root block unaligned: %llu",
+ btrfs_super_log_root(sb));
+ goto error_out;
+ }
+ if (btrfs_super_nodesize(sb) < 4096) {
+ error("nodesize too small: %u < 4096",
+ btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_nodesize(sb), 4096)) {
+ error("nodesize unaligned: %u", btrfs_super_nodesize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_sectorsize(sb) < 4096) {
+ error("sectorsize too small: %u < 4096",
+ btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (!IS_ALIGNED(btrfs_super_sectorsize(sb), 4096)) {
+ error("sectorsize unaligned: %u", btrfs_super_sectorsize(sb));
+ goto error_out;
+ }
+ if (btrfs_super_total_bytes(sb) == 0) {
+ error("invalid total_bytes 0");
+ goto error_out;
+ }
+ if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
+ error("invalid bytes_used %llu", btrfs_super_bytes_used(sb));
+ goto error_out;
+ }
+ if ((btrfs_super_stripesize(sb) != 4096)
+ && (btrfs_super_stripesize(sb) != btrfs_super_sectorsize(sb))) {
+ error("invalid stripesize %u", btrfs_super_stripesize(sb));
+ goto error_out;
+ }
+
+ if (btrfs_super_incompat_flags(sb) & BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
+ metadata_uuid = sb->metadata_uuid;
+ else
+ metadata_uuid = sb->fsid;
+
+ if (memcmp(metadata_uuid, sb->dev_item.fsid, BTRFS_FSID_SIZE) != 0) {
+ char fsid[BTRFS_UUID_UNPARSED_SIZE];
+ char dev_fsid[BTRFS_UUID_UNPARSED_SIZE];
+
+ uuid_unparse(sb->metadata_uuid, fsid);
+ uuid_unparse(sb->dev_item.fsid, dev_fsid);
+ error("dev_item UUID does not match fsid: %s != %s",
+ dev_fsid, fsid);
+ goto error_out;
+ }
+
+ /*
+ * Hint to catch really bogus numbers, bitflips or so
+ */
+ if (btrfs_super_num_devices(sb) > (1UL << 31)) {
+ error("suspicious number of devices: %llu",
+ btrfs_super_num_devices(sb));
+ }
+
+ if (btrfs_super_num_devices(sb) == 0) {
+ error("number of devices is 0");
+ goto error_out;
+ }
+
+ /*
+ * Obvious sys_chunk_array corruptions, it must hold@least one key
+ * and one chunk
+ */
+ if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
+ error("system chunk array too big %u > %u",
+ btrfs_super_sys_array_size(sb),
+ BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
+ goto error_out;
+ }
+ if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
+ + sizeof(struct btrfs_chunk)) {
+ error("system chunk array too small %u < %zu",
+ btrfs_super_sys_array_size(sb),
+ sizeof(struct btrfs_disk_key) +
+ sizeof(struct btrfs_chunk));
+ goto error_out;
+ }
+
+ return 0;
+
+error_out:
+ error("superblock checksum matches but it has invalid members");
+ return -EIO;
+}
+
+/*
+ * btrfs_read_dev_super - read a valid primary superblock from a block device
+ * @desc,@part: file descriptor of the device
+ * @sb: buffer where the superblock is going to be read in
+ *
+ * Unlike the btrfs-progs/kernel version, here we ony care about the first
+ * super block, thus it's much simpler.
+ */
+int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_super_block *sb)
+{
+ char tmp[BTRFS_SUPER_INFO_SIZE];
+ struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
+ int ret;
+
+ ret = __btrfs_devread(desc, part, tmp, BTRFS_SUPER_INFO_SIZE,
+ BTRFS_SUPER_INFO_OFFSET);
+ if (ret < BTRFS_SUPER_INFO_SIZE)
+ return -EIO;
+
+ if (btrfs_super_bytenr(buf) != BTRFS_SUPER_INFO_OFFSET)
+ return -EIO;
+
+ if (btrfs_check_super(buf))
+ return -EIO;
+
+ memcpy(sb, buf, BTRFS_SUPER_INFO_SIZE);
+ return 0;
+}
+
+int btrfs_read_superblock(void)
+{
+ ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
+ struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
+ int ret;
+
+
+ btrfs_info.sb.generation = 0;
+
+ ret = btrfs_read_dev_super(btrfs_blk_desc, btrfs_part_info, sb);
+ if (ret < 0) {
+ debug("%s: No valid BTRFS superblock found!\n", __func__);
+ return ret;
+ }
+ btrfs_super_block_to_cpu(sb);
+ memcpy(&btrfs_info.sb, sb, sizeof(*sb));
+
+ if (btrfs_info.sb.num_devices != 1) {
+ printf("%s: Unsupported number of devices (%lli). This driver "
+ "only supports filesystem on one device.\n", __func__,
+ btrfs_info.sb.num_devices);
+ return -1;
+ }
+
+ debug("Chosen superblock with generation = %llu\n",
+ btrfs_info.sb.generation);
+
+ return 0;
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index efb715828cce..671f1ac55c68 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -2,10 +2,14 @@
#ifndef __BTRFS_DISK_IO_H__
#define __BTRFS_DISK_IO_H__
+#include <linux/sizes.h>
+#include <fs_internal.h>
#include "crypto/hash.h"
#include "ctree.h"
#include "disk-io.h"
+#define BTRFS_SUPER_INFO_OFFSET SZ_64K
+#define BTRFS_SUPER_INFO_SIZE SZ_4K
static inline u64 btrfs_name_hash(const char *name, int len)
{
u32 crc;
@@ -17,4 +21,7 @@ static inline u64 btrfs_name_hash(const char *name, int len)
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_super_block *sb);
+int btrfs_read_superblock(void);
#endif
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
deleted file mode 100644
index 7891d84ed369..000000000000
--- a/fs/btrfs/super.c
+++ /dev/null
@@ -1,247 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
- */
-
-#include "btrfs.h"
-#include "disk-io.h"
-#include <memalign.h>
-
-#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN \
- | BTRFS_HEADER_FLAG_RELOC \
- | BTRFS_SUPER_FLAG_ERROR \
- | BTRFS_SUPER_FLAG_SEEDING \
- | BTRFS_SUPER_FLAG_METADUMP)
-
-#define BTRFS_SUPER_INFO_SIZE 4096
-
-/*
- * checks if a valid root backup is present.
- * considers the case when all root backups empty valid.
- * returns -1 in case of invalid root backup and 0 for valid.
- */
-static int btrfs_check_super_roots(struct btrfs_super_block *sb)
-{
- struct btrfs_root_backup *root_backup;
- int i, newest = -1;
- int num_empty = 0;
-
- for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; ++i) {
- root_backup = sb->super_roots + i;
-
- if (root_backup->tree_root == 0 && root_backup->tree_root_gen == 0)
- num_empty++;
-
- if (root_backup->tree_root_gen == sb->generation)
- newest = i;
- }
-
- if (num_empty == BTRFS_NUM_BACKUP_ROOTS) {
- return 0;
- } else if (newest >= 0) {
- return 0;
- }
-
- return -1;
-}
-
-static inline int is_power_of_2(u64 x)
-{
- return !(x & (x - 1));
-}
-
-static int btrfs_check_super_csum(char *raw_disk_sb)
-{
- struct btrfs_super_block *disk_sb =
- (struct btrfs_super_block *) raw_disk_sb;
- u16 csum_type = le16_to_cpu(disk_sb->csum_type);
-
- if (csum_type == BTRFS_CSUM_TYPE_CRC32 ||
- csum_type == BTRFS_CSUM_TYPE_SHA256 ||
- csum_type == BTRFS_CSUM_TYPE_XXHASH) {
- u8 result[BTRFS_CSUM_SIZE];
-
- btrfs_csum_data(csum_type, (u8 *)raw_disk_sb + BTRFS_CSUM_SIZE,
- result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
-
- if (memcmp(raw_disk_sb, result, BTRFS_CSUM_SIZE))
- return -EIO;
- } else if (csum_type == BTRFS_CSUM_TYPE_BLAKE2){
- printf("Blake2 csum type is not supported yet\n");
- return -ENOTSUPP;
- }
-
- return 0;
-}
-
-static int btrfs_check_super(struct btrfs_super_block *sb)
-{
- int ret = 0;
-
- if (sb->flags & ~BTRFS_SUPER_FLAG_SUPP) {
- printf("%s: Unsupported flags: %llu\n", __func__,
- sb->flags & ~BTRFS_SUPER_FLAG_SUPP);
- }
-
- if (sb->root_level > BTRFS_MAX_LEVEL) {
- printf("%s: tree_root level too big: %d >= %d\n", __func__,
- sb->root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->chunk_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: chunk_root level too big: %d >= %d\n", __func__,
- sb->chunk_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->log_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: log_root level too big: %d >= %d\n", __func__,
- sb->log_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->sectorsize) || sb->sectorsize < 4096 ||
- sb->sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid sectorsize %u\n", __func__,
- sb->sectorsize);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->nodesize) || sb->nodesize < sb->sectorsize ||
- sb->nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid nodesize %u\n", __func__, sb->nodesize);
- ret = -1;
- }
-
- if (sb->nodesize != sb->__unused_leafsize) {
- printf("%s: invalid leafsize %u, should be %u\n", __func__,
- sb->__unused_leafsize, sb->nodesize);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->root, sb->sectorsize)) {
- printf("%s: tree_root block unaligned: %llu\n", __func__,
- sb->root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->chunk_root, sb->sectorsize)) {
- printf("%s: chunk_root block unaligned: %llu\n", __func__,
- sb->chunk_root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->log_root, sb->sectorsize)) {
- printf("%s: log_root block unaligned: %llu\n", __func__,
- sb->log_root);
- ret = -1;
- }
-
- if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
- printf("%s: dev_item UUID does not match fsid\n", __func__);
- ret = -1;
- }
-
- if (sb->bytes_used < 6*sb->nodesize) {
- printf("%s: bytes_used is too small %llu\n", __func__,
- sb->bytes_used);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->stripesize)) {
- printf("%s: invalid stripesize %u\n", __func__, sb->stripesize);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
- printf("%s: system chunk array too big %u > %u\n", __func__,
- sb->sys_chunk_array_size, BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size < sizeof(struct btrfs_key) +
- sizeof(struct btrfs_chunk)) {
- printf("%s: system chunk array too small %u < %zu\n", __func__,
- sb->sys_chunk_array_size, sizeof(struct btrfs_key)
- + sizeof(struct btrfs_chunk));
- ret = -1;
- }
-
- return ret;
-}
-
-int btrfs_read_superblock(void)
-{
- const u64 superblock_offsets[4] = {
- 0x10000ull,
- 0x4000000ull,
- 0x4000000000ull,
- 0x4000000000000ull
- };
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- u64 dev_total_bytes;
- int i;
-
- dev_total_bytes = (u64) btrfs_part_info->size * btrfs_part_info->blksz;
-
- btrfs_info.sb.generation = 0;
-
- for (i = 0; i < 4; ++i) {
- if (superblock_offsets[i] + sizeof(sb) > dev_total_bytes)
- break;
-
- if (!btrfs_devread(superblock_offsets[i], BTRFS_SUPER_INFO_SIZE,
- raw_sb))
- break;
-
- if (btrfs_check_super_csum(raw_sb)) {
- debug("%s: invalid checksum at superblock mirror %i\n",
- __func__, i);
- continue;
- }
-
- btrfs_super_block_to_cpu(sb);
-
- if (sb->magic != BTRFS_MAGIC) {
- debug("%s: invalid BTRFS magic 0x%016llX at "
- "superblock mirror %i\n", __func__, sb->magic, i);
- } else if (sb->bytenr != superblock_offsets[i]) {
- printf("%s: invalid bytenr 0x%016llX (expected "
- "0x%016llX) at superblock mirror %i\n",
- __func__, sb->bytenr, superblock_offsets[i], i);
- } else if (btrfs_check_super(sb)) {
- printf("%s: Checking superblock mirror %i failed\n",
- __func__, i);
- } else if (sb->generation > btrfs_info.sb.generation) {
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
- } else {
- /* Nothing */
- }
- }
-
- if (!btrfs_info.sb.generation) {
- debug("%s: No valid BTRFS superblock found!\n", __func__);
- return -1;
- }
-
- if (btrfs_check_super_roots(&btrfs_info.sb)) {
- printf("%s: No valid root_backup found!\n", __func__);
- return -1;
- }
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 04/26] fs: btrfs: Cross-port rbtree-utils from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This is needed for incoming extent-cache infrastructure.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 3 +-
fs/btrfs/common/rbtree-utils.c | 83 ++++++++++++++++++++++++++++++++++
fs/btrfs/common/rbtree-utils.h | 53 ++++++++++++++++++++++
3 files changed, 138 insertions(+), 1 deletion(-)
create mode 100644 fs/btrfs/common/rbtree-utils.c
create mode 100644 fs/btrfs/common/rbtree-utils.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index bd4b848d1b1f..53be6e8835f2 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,5 @@
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o
+ extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
+ common/rbtree-utils.o extent-cache.o
diff --git a/fs/btrfs/common/rbtree-utils.c b/fs/btrfs/common/rbtree-utils.c
new file mode 100644
index 000000000000..7a7d7e84e6a9
--- /dev/null
+++ b/fs/btrfs/common/rbtree-utils.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 Facebook. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/errno.h>
+#include "rbtree-utils.h"
+
+int rb_insert(struct rb_root *root, struct rb_node *node,
+ rb_compare_nodes comp)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ int ret;
+
+ while(*p) {
+ parent = *p;
+
+ ret = comp(parent, node);
+ if (ret < 0)
+ p = &(*p)->rb_left;
+ else if (ret > 0)
+ p = &(*p)->rb_right;
+ else
+ return -EEXIST;
+ }
+
+ rb_link_node(node, parent, p);
+ rb_insert_color(node, root);
+ return 0;
+}
+
+struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
+ struct rb_node **next_ret)
+{
+ struct rb_node *n = root->rb_node;
+ struct rb_node *parent = NULL;
+ int ret = 0;
+
+ while(n) {
+ parent = n;
+
+ ret = comp(n, key);
+ if (ret < 0)
+ n = n->rb_left;
+ else if (ret > 0)
+ n = n->rb_right;
+ else
+ return n;
+ }
+
+ if (!next_ret)
+ return NULL;
+
+ if (parent && ret > 0)
+ parent = rb_next(parent);
+
+ *next_ret = parent;
+ return NULL;
+}
+
+void rb_free_nodes(struct rb_root *root, rb_free_node free_node)
+{
+ struct rb_node *node;
+
+ while ((node = rb_first(root))) {
+ rb_erase(node, root);
+ free_node(node);
+ }
+}
diff --git a/fs/btrfs/common/rbtree-utils.h b/fs/btrfs/common/rbtree-utils.h
new file mode 100644
index 000000000000..d977cfd9554d
--- /dev/null
+++ b/fs/btrfs/common/rbtree-utils.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2014 Facebook. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __RBTREE_UTILS__
+#define __RBTREE_UTILS__
+
+#include <linux/rbtree.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The common insert/search/free functions */
+typedef int (*rb_compare_nodes)(struct rb_node *node1, struct rb_node *node2);
+typedef int (*rb_compare_keys)(struct rb_node *node, void *key);
+typedef void (*rb_free_node)(struct rb_node *node);
+
+int rb_insert(struct rb_root *root, struct rb_node *node,
+ rb_compare_nodes comp);
+/*
+ * In some cases, we need return the next node if we don't find the node we
+ * specify. At this time, we can use next_ret.
+ */
+struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
+ struct rb_node **next_ret);
+void rb_free_nodes(struct rb_root *root, rb_free_node free_node);
+
+#define FREE_RB_BASED_TREE(name, free_func) \
+static void free_##name##_tree(struct rb_root *root) \
+{ \
+ rb_free_nodes(root, free_func); \
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 04/26] fs: btrfs: Cross-port rbtree-utils from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This is needed for incoming extent-cache infrastructure.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 3 +-
fs/btrfs/common/rbtree-utils.c | 83 ++++++++++++++++++++++++++++++++++
fs/btrfs/common/rbtree-utils.h | 53 ++++++++++++++++++++++
3 files changed, 138 insertions(+), 1 deletion(-)
create mode 100644 fs/btrfs/common/rbtree-utils.c
create mode 100644 fs/btrfs/common/rbtree-utils.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index bd4b848d1b1f..53be6e8835f2 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -3,4 +3,5 @@
# 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o
+ extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
+ common/rbtree-utils.o extent-cache.o
diff --git a/fs/btrfs/common/rbtree-utils.c b/fs/btrfs/common/rbtree-utils.c
new file mode 100644
index 000000000000..7a7d7e84e6a9
--- /dev/null
+++ b/fs/btrfs/common/rbtree-utils.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2014 Facebook. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/errno.h>
+#include "rbtree-utils.h"
+
+int rb_insert(struct rb_root *root, struct rb_node *node,
+ rb_compare_nodes comp)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ int ret;
+
+ while(*p) {
+ parent = *p;
+
+ ret = comp(parent, node);
+ if (ret < 0)
+ p = &(*p)->rb_left;
+ else if (ret > 0)
+ p = &(*p)->rb_right;
+ else
+ return -EEXIST;
+ }
+
+ rb_link_node(node, parent, p);
+ rb_insert_color(node, root);
+ return 0;
+}
+
+struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
+ struct rb_node **next_ret)
+{
+ struct rb_node *n = root->rb_node;
+ struct rb_node *parent = NULL;
+ int ret = 0;
+
+ while(n) {
+ parent = n;
+
+ ret = comp(n, key);
+ if (ret < 0)
+ n = n->rb_left;
+ else if (ret > 0)
+ n = n->rb_right;
+ else
+ return n;
+ }
+
+ if (!next_ret)
+ return NULL;
+
+ if (parent && ret > 0)
+ parent = rb_next(parent);
+
+ *next_ret = parent;
+ return NULL;
+}
+
+void rb_free_nodes(struct rb_root *root, rb_free_node free_node)
+{
+ struct rb_node *node;
+
+ while ((node = rb_first(root))) {
+ rb_erase(node, root);
+ free_node(node);
+ }
+}
diff --git a/fs/btrfs/common/rbtree-utils.h b/fs/btrfs/common/rbtree-utils.h
new file mode 100644
index 000000000000..d977cfd9554d
--- /dev/null
+++ b/fs/btrfs/common/rbtree-utils.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2014 Facebook. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __RBTREE_UTILS__
+#define __RBTREE_UTILS__
+
+#include <linux/rbtree.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The common insert/search/free functions */
+typedef int (*rb_compare_nodes)(struct rb_node *node1, struct rb_node *node2);
+typedef int (*rb_compare_keys)(struct rb_node *node, void *key);
+typedef void (*rb_free_node)(struct rb_node *node);
+
+int rb_insert(struct rb_root *root, struct rb_node *node,
+ rb_compare_nodes comp);
+/*
+ * In some cases, we need return the next node if we don't find the node we
+ * specify. At this time, we can use next_ret.
+ */
+struct rb_node *rb_search(struct rb_root *root, void *key, rb_compare_keys comp,
+ struct rb_node **next_ret);
+void rb_free_nodes(struct rb_root *root, rb_free_node free_node);
+
+#define FREE_RB_BASED_TREE(name, free_func) \
+static void free_##name##_tree(struct rb_root *root) \
+{ \
+ rb_free_nodes(root, free_func); \
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 05/26] fs: btrfs: Cross-port extent-cache.[ch] from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This patch implements an infrastructure to insert/search/merge an extent
range (with variable length).
This provides the basis for later extent buffer cache used in btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/extent-cache.c | 318 ++++++++++++++++++++++++++++++++++++++++
fs/btrfs/extent-cache.h | 104 +++++++++++++
2 files changed, 422 insertions(+)
create mode 100644 fs/btrfs/extent-cache.c
create mode 100644 fs/btrfs/extent-cache.h
diff --git a/fs/btrfs/extent-cache.c b/fs/btrfs/extent-cache.c
new file mode 100644
index 000000000000..e7b055f55422
--- /dev/null
+++ b/fs/btrfs/extent-cache.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from the same named file of btrfs-progs.
+ *
+ * Minor modification to include headers.
+ */
+#include <linux/kernel.h>
+#include <linux/rbtree.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
+#include <stdlib.h>
+#include "extent-cache.h"
+#include "common/rbtree-utils.h"
+
+struct cache_extent_search_range {
+ u64 objectid;
+ u64 start;
+ u64 size;
+};
+
+static int cache_tree_comp_range(struct rb_node *node, void *data)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range *range;
+
+ range = (struct cache_extent_search_range *)data;
+ entry = rb_entry(node, struct cache_extent, rb_node);
+
+ if (entry->start + entry->size <= range->start)
+ return 1;
+ else if (range->start + range->size <= entry->start)
+ return -1;
+ else
+ return 0;
+}
+
+static int cache_tree_comp_nodes(struct rb_node *node1, struct rb_node *node2)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ entry = rb_entry(node2, struct cache_extent, rb_node);
+ range.start = entry->start;
+ range.size = entry->size;
+
+ return cache_tree_comp_range(node1, (void *)&range);
+}
+
+static int cache_tree_comp_range2(struct rb_node *node, void *data)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range *range;
+
+ range = (struct cache_extent_search_range *)data;
+ entry = rb_entry(node, struct cache_extent, rb_node);
+
+ if (entry->objectid < range->objectid)
+ return 1;
+ else if (entry->objectid > range->objectid)
+ return -1;
+ else if (entry->start + entry->size <= range->start)
+ return 1;
+ else if (range->start + range->size <= entry->start)
+ return -1;
+ else
+ return 0;
+}
+
+static int cache_tree_comp_nodes2(struct rb_node *node1, struct rb_node *node2)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ entry = rb_entry(node2, struct cache_extent, rb_node);
+ range.objectid = entry->objectid;
+ range.start = entry->start;
+ range.size = entry->size;
+
+ return cache_tree_comp_range2(node1, (void *)&range);
+}
+
+void cache_tree_init(struct cache_tree *tree)
+{
+ tree->root = RB_ROOT;
+}
+
+static struct cache_extent *alloc_cache_extent(u64 start, u64 size)
+{
+ struct cache_extent *pe = malloc(sizeof(*pe));
+
+ if (!pe)
+ return pe;
+
+ pe->objectid = 0;
+ pe->start = start;
+ pe->size = size;
+ return pe;
+}
+
+int add_cache_extent(struct cache_tree *tree, u64 start, u64 size)
+{
+ struct cache_extent *pe = alloc_cache_extent(start, size);
+ int ret;
+
+ if (!pe)
+ return -ENOMEM;
+
+ ret = insert_cache_extent(tree, pe);
+ if (ret)
+ free(pe);
+
+ return ret;
+}
+
+int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
+{
+ return rb_insert(&tree->root, &pe->rb_node, cache_tree_comp_nodes);
+}
+
+int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe)
+{
+ return rb_insert(&tree->root, &pe->rb_node, cache_tree_comp_nodes2);
+}
+
+struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
+ u64 start, u64 size)
+{
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.start = start;
+ range.size = size;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range, NULL);
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start, u64 size)
+{
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.objectid = objectid;
+ range.start = start;
+ range.size = size;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range2, NULL);
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start)
+{
+ struct rb_node *next;
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.start = start;
+ range.size = 1;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range, &next);
+ if (!node)
+ node = next;
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *search_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start)
+{
+ struct rb_node *next;
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.objectid = objectid;
+ range.start = start;
+ range.size = 1;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range2, &next);
+ if (!node)
+ node = next;
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *first_cache_extent(struct cache_tree *tree)
+{
+ struct rb_node *node = rb_first(&tree->root);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *last_cache_extent(struct cache_tree *tree)
+{
+ struct rb_node *node = rb_last(&tree->root);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *prev_cache_extent(struct cache_extent *pe)
+{
+ struct rb_node *node = rb_prev(&pe->rb_node);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *next_cache_extent(struct cache_extent *pe)
+{
+ struct rb_node *node = rb_next(&pe->rb_node);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
+{
+ rb_erase(&pe->rb_node, &tree->root);
+}
+
+void cache_tree_free_extents(struct cache_tree *tree,
+ free_cache_extent free_func)
+{
+ struct cache_extent *ce;
+
+ while ((ce = first_cache_extent(tree))) {
+ remove_cache_extent(tree, ce);
+ free_func(ce);
+ }
+}
+
+static void free_extent_cache(struct cache_extent *pe)
+{
+ free(pe);
+}
+
+void free_extent_cache_tree(struct cache_tree *tree)
+{
+ cache_tree_free_extents(tree, free_extent_cache);
+}
+
+int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size)
+{
+ struct cache_extent *cache;
+ struct cache_extent *next = NULL;
+ struct cache_extent *prev = NULL;
+ int next_merged = 0;
+ int prev_merged = 0;
+ int ret = 0;
+
+ if (cache_tree_empty(tree))
+ goto insert;
+
+ cache = search_cache_extent(tree, start);
+ if (!cache) {
+ /*
+ * Either the tree is completely empty, or the no range after
+ * start.
+ * Either way, the last cache_extent should be prev.
+ */
+ prev = last_cache_extent(tree);
+ } else if (start <= cache->start) {
+ next = cache;
+ prev = prev_cache_extent(cache);
+ } else {
+ prev = cache;
+ next = next_cache_extent(cache);
+ }
+
+ /*
+ * Ensure the range to be inserted won't cover with existings
+ * Or we will need extra loop to do merge
+ */
+ BUG_ON(next && start + size > next->start);
+ BUG_ON(prev && prev->start + prev->size > start);
+
+ if (next && start + size == next->start) {
+ next_merged = 1;
+ next->size = next->start + next->size - start;
+ next->start = start;
+ }
+ if (prev && prev->start + prev->size == start) {
+ prev_merged = 1;
+ if (next_merged) {
+ next->size = next->start + next->size - prev->start;
+ next->start = prev->start;
+ remove_cache_extent(tree, prev);
+ free(prev);
+ } else {
+ prev->size = start + size - prev->start;
+ }
+ }
+insert:
+ if (!prev_merged && !next_merged)
+ ret = add_cache_extent(tree, start, size);
+ return ret;
+}
diff --git a/fs/btrfs/extent-cache.h b/fs/btrfs/extent-cache.h
new file mode 100644
index 000000000000..b6acd09fe983
--- /dev/null
+++ b/fs/btrfs/extent-cache.h
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from the same named file of btrfs-progs.
+ *
+ * Minor modification to include headers.
+ */
+#ifndef __BTRFS_EXTENT_CACHE_H__
+#define __BTRFS_EXTENT_CACHE_H__
+
+#include <linux/rbtree.h>
+#include <linux/types.h>
+
+struct cache_tree {
+ struct rb_root root;
+};
+
+struct cache_extent {
+ struct rb_node rb_node;
+ u64 objectid;
+ u64 start;
+ u64 size;
+};
+
+void cache_tree_init(struct cache_tree *tree);
+
+struct cache_extent *first_cache_extent(struct cache_tree *tree);
+struct cache_extent *last_cache_extent(struct cache_tree *tree);
+struct cache_extent *prev_cache_extent(struct cache_extent *pe);
+struct cache_extent *next_cache_extent(struct cache_extent *pe);
+
+/*
+ * Find a cache_extent which covers start.
+ *
+ * If not found, return next cache_extent if possible.
+ */
+struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start);
+
+/*
+ * Find a cache_extent which restrictly covers start.
+ *
+ * If not found, return NULL.
+ */
+struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
+ u64 start, u64 size);
+
+/*
+ * Add an non-overlap extent into cache tree
+ *
+ * If [start, start+size) overlap with existing one, it will return -EEXIST.
+ */
+int add_cache_extent(struct cache_tree *tree, u64 start, u64 size);
+
+/*
+ * Same with add_cache_extent, but with cache_extent strcut.
+ */
+int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
+void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
+
+static inline int cache_tree_empty(struct cache_tree *tree)
+{
+ return RB_EMPTY_ROOT(&tree->root);
+}
+
+typedef void (*free_cache_extent)(struct cache_extent *pe);
+
+void cache_tree_free_extents(struct cache_tree *tree,
+ free_cache_extent free_func);
+
+#define FREE_EXTENT_CACHE_BASED_TREE(name, free_func) \
+static void free_##name##_tree(struct cache_tree *tree) \
+{ \
+ cache_tree_free_extents(tree, free_func); \
+}
+
+void free_extent_cache_tree(struct cache_tree *tree);
+
+/*
+ * Search a cache_extent with same objectid, and covers start.
+ *
+ * If not found, return next if possible.
+ */
+struct cache_extent *search_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start);
+/*
+ * Search a cache_extent with same objectid, and covers the range
+ * [start, start + size)
+ *
+ * If not found, return next cache_extent if possible.
+ */
+struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start, u64 size);
+int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe);
+
+/*
+ * Insert a cache_extent range [start, start + size).
+ *
+ * This function may merge with existing cache_extent.
+ * NOTE: caller must ensure the inserted range won't cover with any existing
+ * range.
+ */
+int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size);
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 05/26] fs: btrfs: Cross-port extent-cache.[ch] from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This patch implements an infrastructure to insert/search/merge an extent
range (with variable length).
This provides the basis for later extent buffer cache used in btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/extent-cache.c | 318 ++++++++++++++++++++++++++++++++++++++++
fs/btrfs/extent-cache.h | 104 +++++++++++++
2 files changed, 422 insertions(+)
create mode 100644 fs/btrfs/extent-cache.c
create mode 100644 fs/btrfs/extent-cache.h
diff --git a/fs/btrfs/extent-cache.c b/fs/btrfs/extent-cache.c
new file mode 100644
index 000000000000..e7b055f55422
--- /dev/null
+++ b/fs/btrfs/extent-cache.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from the same named file of btrfs-progs.
+ *
+ * Minor modification to include headers.
+ */
+#include <linux/kernel.h>
+#include <linux/rbtree.h>
+#include <linux/errno.h>
+#include <linux/bug.h>
+#include <stdlib.h>
+#include "extent-cache.h"
+#include "common/rbtree-utils.h"
+
+struct cache_extent_search_range {
+ u64 objectid;
+ u64 start;
+ u64 size;
+};
+
+static int cache_tree_comp_range(struct rb_node *node, void *data)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range *range;
+
+ range = (struct cache_extent_search_range *)data;
+ entry = rb_entry(node, struct cache_extent, rb_node);
+
+ if (entry->start + entry->size <= range->start)
+ return 1;
+ else if (range->start + range->size <= entry->start)
+ return -1;
+ else
+ return 0;
+}
+
+static int cache_tree_comp_nodes(struct rb_node *node1, struct rb_node *node2)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ entry = rb_entry(node2, struct cache_extent, rb_node);
+ range.start = entry->start;
+ range.size = entry->size;
+
+ return cache_tree_comp_range(node1, (void *)&range);
+}
+
+static int cache_tree_comp_range2(struct rb_node *node, void *data)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range *range;
+
+ range = (struct cache_extent_search_range *)data;
+ entry = rb_entry(node, struct cache_extent, rb_node);
+
+ if (entry->objectid < range->objectid)
+ return 1;
+ else if (entry->objectid > range->objectid)
+ return -1;
+ else if (entry->start + entry->size <= range->start)
+ return 1;
+ else if (range->start + range->size <= entry->start)
+ return -1;
+ else
+ return 0;
+}
+
+static int cache_tree_comp_nodes2(struct rb_node *node1, struct rb_node *node2)
+{
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ entry = rb_entry(node2, struct cache_extent, rb_node);
+ range.objectid = entry->objectid;
+ range.start = entry->start;
+ range.size = entry->size;
+
+ return cache_tree_comp_range2(node1, (void *)&range);
+}
+
+void cache_tree_init(struct cache_tree *tree)
+{
+ tree->root = RB_ROOT;
+}
+
+static struct cache_extent *alloc_cache_extent(u64 start, u64 size)
+{
+ struct cache_extent *pe = malloc(sizeof(*pe));
+
+ if (!pe)
+ return pe;
+
+ pe->objectid = 0;
+ pe->start = start;
+ pe->size = size;
+ return pe;
+}
+
+int add_cache_extent(struct cache_tree *tree, u64 start, u64 size)
+{
+ struct cache_extent *pe = alloc_cache_extent(start, size);
+ int ret;
+
+ if (!pe)
+ return -ENOMEM;
+
+ ret = insert_cache_extent(tree, pe);
+ if (ret)
+ free(pe);
+
+ return ret;
+}
+
+int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
+{
+ return rb_insert(&tree->root, &pe->rb_node, cache_tree_comp_nodes);
+}
+
+int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe)
+{
+ return rb_insert(&tree->root, &pe->rb_node, cache_tree_comp_nodes2);
+}
+
+struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
+ u64 start, u64 size)
+{
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.start = start;
+ range.size = size;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range, NULL);
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start, u64 size)
+{
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.objectid = objectid;
+ range.start = start;
+ range.size = size;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range2, NULL);
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start)
+{
+ struct rb_node *next;
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.start = start;
+ range.size = 1;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range, &next);
+ if (!node)
+ node = next;
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *search_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start)
+{
+ struct rb_node *next;
+ struct rb_node *node;
+ struct cache_extent *entry;
+ struct cache_extent_search_range range;
+
+ range.objectid = objectid;
+ range.start = start;
+ range.size = 1;
+ node = rb_search(&tree->root, &range, cache_tree_comp_range2, &next);
+ if (!node)
+ node = next;
+ if (!node)
+ return NULL;
+
+ entry = rb_entry(node, struct cache_extent, rb_node);
+ return entry;
+}
+
+struct cache_extent *first_cache_extent(struct cache_tree *tree)
+{
+ struct rb_node *node = rb_first(&tree->root);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *last_cache_extent(struct cache_tree *tree)
+{
+ struct rb_node *node = rb_last(&tree->root);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *prev_cache_extent(struct cache_extent *pe)
+{
+ struct rb_node *node = rb_prev(&pe->rb_node);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+struct cache_extent *next_cache_extent(struct cache_extent *pe)
+{
+ struct rb_node *node = rb_next(&pe->rb_node);
+
+ if (!node)
+ return NULL;
+ return rb_entry(node, struct cache_extent, rb_node);
+}
+
+void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe)
+{
+ rb_erase(&pe->rb_node, &tree->root);
+}
+
+void cache_tree_free_extents(struct cache_tree *tree,
+ free_cache_extent free_func)
+{
+ struct cache_extent *ce;
+
+ while ((ce = first_cache_extent(tree))) {
+ remove_cache_extent(tree, ce);
+ free_func(ce);
+ }
+}
+
+static void free_extent_cache(struct cache_extent *pe)
+{
+ free(pe);
+}
+
+void free_extent_cache_tree(struct cache_tree *tree)
+{
+ cache_tree_free_extents(tree, free_extent_cache);
+}
+
+int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size)
+{
+ struct cache_extent *cache;
+ struct cache_extent *next = NULL;
+ struct cache_extent *prev = NULL;
+ int next_merged = 0;
+ int prev_merged = 0;
+ int ret = 0;
+
+ if (cache_tree_empty(tree))
+ goto insert;
+
+ cache = search_cache_extent(tree, start);
+ if (!cache) {
+ /*
+ * Either the tree is completely empty, or the no range after
+ * start.
+ * Either way, the last cache_extent should be prev.
+ */
+ prev = last_cache_extent(tree);
+ } else if (start <= cache->start) {
+ next = cache;
+ prev = prev_cache_extent(cache);
+ } else {
+ prev = cache;
+ next = next_cache_extent(cache);
+ }
+
+ /*
+ * Ensure the range to be inserted won't cover with existings
+ * Or we will need extra loop to do merge
+ */
+ BUG_ON(next && start + size > next->start);
+ BUG_ON(prev && prev->start + prev->size > start);
+
+ if (next && start + size == next->start) {
+ next_merged = 1;
+ next->size = next->start + next->size - start;
+ next->start = start;
+ }
+ if (prev && prev->start + prev->size == start) {
+ prev_merged = 1;
+ if (next_merged) {
+ next->size = next->start + next->size - prev->start;
+ next->start = prev->start;
+ remove_cache_extent(tree, prev);
+ free(prev);
+ } else {
+ prev->size = start + size - prev->start;
+ }
+ }
+insert:
+ if (!prev_merged && !next_merged)
+ ret = add_cache_extent(tree, start, size);
+ return ret;
+}
diff --git a/fs/btrfs/extent-cache.h b/fs/btrfs/extent-cache.h
new file mode 100644
index 000000000000..b6acd09fe983
--- /dev/null
+++ b/fs/btrfs/extent-cache.h
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from the same named file of btrfs-progs.
+ *
+ * Minor modification to include headers.
+ */
+#ifndef __BTRFS_EXTENT_CACHE_H__
+#define __BTRFS_EXTENT_CACHE_H__
+
+#include <linux/rbtree.h>
+#include <linux/types.h>
+
+struct cache_tree {
+ struct rb_root root;
+};
+
+struct cache_extent {
+ struct rb_node rb_node;
+ u64 objectid;
+ u64 start;
+ u64 size;
+};
+
+void cache_tree_init(struct cache_tree *tree);
+
+struct cache_extent *first_cache_extent(struct cache_tree *tree);
+struct cache_extent *last_cache_extent(struct cache_tree *tree);
+struct cache_extent *prev_cache_extent(struct cache_extent *pe);
+struct cache_extent *next_cache_extent(struct cache_extent *pe);
+
+/*
+ * Find a cache_extent which covers start.
+ *
+ * If not found, return next cache_extent if possible.
+ */
+struct cache_extent *search_cache_extent(struct cache_tree *tree, u64 start);
+
+/*
+ * Find a cache_extent which restrictly covers start.
+ *
+ * If not found, return NULL.
+ */
+struct cache_extent *lookup_cache_extent(struct cache_tree *tree,
+ u64 start, u64 size);
+
+/*
+ * Add an non-overlap extent into cache tree
+ *
+ * If [start, start+size) overlap with existing one, it will return -EEXIST.
+ */
+int add_cache_extent(struct cache_tree *tree, u64 start, u64 size);
+
+/*
+ * Same with add_cache_extent, but with cache_extent strcut.
+ */
+int insert_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
+void remove_cache_extent(struct cache_tree *tree, struct cache_extent *pe);
+
+static inline int cache_tree_empty(struct cache_tree *tree)
+{
+ return RB_EMPTY_ROOT(&tree->root);
+}
+
+typedef void (*free_cache_extent)(struct cache_extent *pe);
+
+void cache_tree_free_extents(struct cache_tree *tree,
+ free_cache_extent free_func);
+
+#define FREE_EXTENT_CACHE_BASED_TREE(name, free_func) \
+static void free_##name##_tree(struct cache_tree *tree) \
+{ \
+ cache_tree_free_extents(tree, free_func); \
+}
+
+void free_extent_cache_tree(struct cache_tree *tree);
+
+/*
+ * Search a cache_extent with same objectid, and covers start.
+ *
+ * If not found, return next if possible.
+ */
+struct cache_extent *search_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start);
+/*
+ * Search a cache_extent with same objectid, and covers the range
+ * [start, start + size)
+ *
+ * If not found, return next cache_extent if possible.
+ */
+struct cache_extent *lookup_cache_extent2(struct cache_tree *tree,
+ u64 objectid, u64 start, u64 size);
+int insert_cache_extent2(struct cache_tree *tree, struct cache_extent *pe);
+
+/*
+ * Insert a cache_extent range [start, start + size).
+ *
+ * This function may merge with existing cache_extent.
+ * NOTE: caller must ensure the inserted range won't cover with any existing
+ * range.
+ */
+int add_merge_cache_extent(struct cache_tree *tree, u64 start, u64 size);
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 06/26] fs: btrfs: Cross-port extent-io.[ch] from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This cross port brings the extent_io_tree infrastructure, with that we
could finally bring in proper btrfs_fs_info structure to ctree.h.
Also with read/write_extent_buffer() implemented, also backport
read/write_eb_member() to ctree.h.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/ctree.h | 55 +++
fs/btrfs/extent-io.c | 801 ++++++++++++++++++++++++++++++++++++++++++-
fs/btrfs/extent-io.h | 164 +++++++++
4 files changed, 1020 insertions(+), 2 deletions(-)
create mode 100644 fs/btrfs/extent-io.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 53be6e8835f2..6dac3a7e239b 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o
+ common/rbtree-utils.o extent-cache.o extent-io.o
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 02125e5e100c..c7528d1ac3db 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -11,8 +11,10 @@
#include <common.h>
#include <compiler.h>
+#include <linux/rbtree.h>
#include "kernel-shared/btrfs_tree.h"
#include "compat.h"
+#include "extent-io.h"
#define BTRFS_MAX_MIRRORS 3
@@ -48,6 +50,18 @@
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
+#define read_eb_member(eb, ptr, type, member, result) ( \
+ read_extent_buffer(eb, (char *)(result), \
+ ((unsigned long)(ptr)) + \
+ offsetof(type, member), \
+ sizeof(((type *)0)->member)))
+
+#define write_eb_member(eb, ptr, type, member, result) ( \
+ write_extent_buffer(eb, (char *)(result), \
+ ((unsigned long)(ptr)) + \
+ offsetof(type, member), \
+ sizeof(((type *)0)->member)))
+
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(const type *s) \
{ \
@@ -75,6 +89,47 @@ struct btrfs_root {
u64 root_dirid;
};
+struct btrfs_mapping_tree {
+ struct cache_tree cache_tree;
+};
+
+struct btrfs_device;
+struct btrfs_fs_info {
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *new_chunk_tree_uuid;
+ struct btrfs_root *fs_root;
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ struct btrfs_root *csum_root;
+
+ struct rb_root fs_root_tree;
+
+ struct extent_io_tree extent_cache;
+ struct extent_io_tree free_space_cache;
+ struct extent_io_tree pinned_extents;
+ struct extent_io_tree extent_ins;
+ struct extent_io_tree *excluded_extents;
+
+ struct rb_root block_group_cache_tree;
+ /* logical->physical extent mapping */
+ struct btrfs_mapping_tree mapping_tree;
+
+ u64 generation;
+ u64 last_trans_committed;
+
+ struct btrfs_super_block *super_copy;
+
+ u64 super_bytenr;
+
+ /* Only support one device yet */
+ struct btrfs_devvice *dev;
+
+ /* Cached block sizes */
+ u32 nodesize;
+ u32 sectorsize;
+ u32 stripesize;
+};
+
int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 66d0e1c7d65f..dc0832c8645f 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -5,9 +5,13 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
-#include "btrfs.h"
+#include <linux/kernel.h>
#include <malloc.h>
#include <memalign.h>
+#include "btrfs.h"
+#include "ctree.h"
+#include "extent-io.h"
+#include "disk-io.h"
u64 btrfs_read_extent_inline(struct btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
@@ -118,3 +122,798 @@ err:
free(cbuf);
return -1ULL;
}
+
+void extent_io_tree_init(struct extent_io_tree *tree)
+{
+ cache_tree_init(&tree->state);
+ cache_tree_init(&tree->cache);
+ tree->cache_size = 0;
+}
+
+static struct extent_state *alloc_extent_state(void)
+{
+ struct extent_state *state;
+
+ state = malloc(sizeof(*state));
+ if (!state)
+ return NULL;
+ state->cache_node.objectid = 0;
+ state->refs = 1;
+ state->state = 0;
+ state->xprivate = 0;
+ return state;
+}
+
+static void btrfs_free_extent_state(struct extent_state *state)
+{
+ state->refs--;
+ BUG_ON(state->refs < 0);
+ if (state->refs == 0)
+ free(state);
+}
+
+static void free_extent_state_func(struct cache_extent *cache)
+{
+ struct extent_state *es;
+
+ es = container_of(cache, struct extent_state, cache_node);
+ btrfs_free_extent_state(es);
+}
+
+static void free_extent_buffer_final(struct extent_buffer *eb);
+void extent_io_tree_cleanup(struct extent_io_tree *tree)
+{
+ cache_tree_free_extents(&tree->state, free_extent_state_func);
+}
+
+static inline void update_extent_state(struct extent_state *state)
+{
+ state->cache_node.start = state->start;
+ state->cache_node.size = state->end + 1 - state->start;
+}
+
+/*
+ * Utility function to look for merge candidates inside a given range.
+ * Any extents with matching state are merged together into a single
+ * extent in the tree. Extents with EXTENT_IO in their state field are
+ * not merged
+ */
+static int merge_state(struct extent_io_tree *tree,
+ struct extent_state *state)
+{
+ struct extent_state *other;
+ struct cache_extent *other_node;
+
+ if (state->state & EXTENT_IOBITS)
+ return 0;
+
+ other_node = prev_cache_extent(&state->cache_node);
+ if (other_node) {
+ other = container_of(other_node, struct extent_state,
+ cache_node);
+ if (other->end == state->start - 1 &&
+ other->state == state->state) {
+ state->start = other->start;
+ update_extent_state(state);
+ remove_cache_extent(&tree->state, &other->cache_node);
+ btrfs_free_extent_state(other);
+ }
+ }
+ other_node = next_cache_extent(&state->cache_node);
+ if (other_node) {
+ other = container_of(other_node, struct extent_state,
+ cache_node);
+ if (other->start == state->end + 1 &&
+ other->state == state->state) {
+ other->start = state->start;
+ update_extent_state(other);
+ remove_cache_extent(&tree->state, &state->cache_node);
+ btrfs_free_extent_state(state);
+ }
+ }
+ return 0;
+}
+
+/*
+ * insert an extent_state struct into the tree. 'bits' are set on the
+ * struct before it is inserted.
+ */
+static int insert_state(struct extent_io_tree *tree,
+ struct extent_state *state, u64 start, u64 end,
+ int bits)
+{
+ int ret;
+
+ BUG_ON(end < start);
+ state->state |= bits;
+ state->start = start;
+ state->end = end;
+ update_extent_state(state);
+ ret = insert_cache_extent(&tree->state, &state->cache_node);
+ BUG_ON(ret);
+ merge_state(tree, state);
+ return 0;
+}
+
+/*
+ * split a given extent state struct in two, inserting the preallocated
+ * struct 'prealloc' as the newly created second half. 'split' indicates an
+ * offset inside 'orig' where it should be split.
+ */
+static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
+ struct extent_state *prealloc, u64 split)
+{
+ int ret;
+ prealloc->start = orig->start;
+ prealloc->end = split - 1;
+ prealloc->state = orig->state;
+ update_extent_state(prealloc);
+ orig->start = split;
+ update_extent_state(orig);
+ ret = insert_cache_extent(&tree->state, &prealloc->cache_node);
+ BUG_ON(ret);
+ return 0;
+}
+
+/*
+ * clear some bits on a range in the tree.
+ */
+static int clear_state_bit(struct extent_io_tree *tree,
+ struct extent_state *state, int bits)
+{
+ int ret = state->state & bits;
+
+ state->state &= ~bits;
+ if (state->state == 0) {
+ remove_cache_extent(&tree->state, &state->cache_node);
+ btrfs_free_extent_state(state);
+ } else {
+ merge_state(tree, state);
+ }
+ return ret;
+}
+
+/*
+ * extent_buffer_bitmap_set - set an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to set
+ */
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
+ const unsigned int size = pos + len;
+ int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
+ u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos);
+
+ while (len >= bits_to_set) {
+ *p |= mask_to_set;
+ len -= bits_to_set;
+ bits_to_set = BITS_PER_BYTE;
+ mask_to_set = ~0;
+ p++;
+ }
+ if (len) {
+ mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
+ *p |= mask_to_set;
+ }
+}
+
+/*
+ * extent_buffer_bitmap_clear - clear an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to clear
+ */
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
+ const unsigned int size = pos + len;
+ int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
+ u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos);
+
+ while (len >= bits_to_clear) {
+ *p &= ~mask_to_clear;
+ len -= bits_to_clear;
+ bits_to_clear = BITS_PER_BYTE;
+ mask_to_clear = ~0;
+ p++;
+ }
+ if (len) {
+ mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
+ *p &= ~mask_to_clear;
+ }
+}
+
+/*
+ * clear some bits on a range in the tree.
+ */
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct cache_extent *node;
+ u64 last_end;
+ int err;
+ int set = 0;
+
+again:
+ if (!prealloc) {
+ prealloc = alloc_extent_state();
+ if (!prealloc)
+ return -ENOMEM;
+ }
+
+ /*
+ * this search will find the extents that end after
+ * our range starts
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node)
+ goto out;
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start > end)
+ goto out;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state | or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip
+ * bits on second half.
+ *
+ * If the extent we found extends past our range, we
+ * just split and search again. It'll get split again
+ * the next time though.
+ *
+ * If the extent we found is inside our range, we clear
+ * the desired bit on it.
+ */
+ if (state->start < start) {
+ err = split_state(tree, state, prealloc, start);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ set |= clear_state_bit(tree, state, bits);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ } else {
+ start = state->start;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * We need to split the extent, and clear the bit
+ * on the first half
+ */
+ if (state->start <= end && state->end > end) {
+ err = split_state(tree, state, prealloc, end + 1);
+ BUG_ON(err == -EEXIST);
+
+ set |= clear_state_bit(tree, prealloc, bits);
+ prealloc = NULL;
+ goto out;
+ }
+
+ start = state->end + 1;
+ set |= clear_state_bit(tree, state, bits);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ goto search_again;
+out:
+ if (prealloc)
+ btrfs_free_extent_state(prealloc);
+ return set;
+
+search_again:
+ if (start > end)
+ goto out;
+ goto again;
+}
+
+/*
+ * set some bits on a range in the tree.
+ */
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct cache_extent *node;
+ int err = 0;
+ u64 last_start;
+ u64 last_end;
+again:
+ if (!prealloc) {
+ prealloc = alloc_extent_state();
+ if (!prealloc)
+ return -ENOMEM;
+ }
+
+ /*
+ * this search will find the extents that end after
+ * our range starts
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ err = insert_state(tree, prealloc, start, end, bits);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ goto out;
+ }
+
+ state = container_of(node, struct extent_state, cache_node);
+ last_start = state->start;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * Just lock what we found and keep going
+ */
+ if (state->start == start && state->end <= end) {
+ state->state |= bits;
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip bits on
+ * second half.
+ *
+ * If the extent we found extends past our
+ * range, we just split and search again. It'll get split
+ * again the next time though.
+ *
+ * If the extent we found is inside our range, we set the
+ * desired bit on it.
+ */
+ if (state->start < start) {
+ err = split_state(tree, state, prealloc, start);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ state->state |= bits;
+ start = state->end + 1;
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ } else {
+ start = state->start;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state | or | state |
+ *
+ * There's a hole, we need to insert something in it and
+ * ignore the extent we found.
+ */
+ if (state->start > start) {
+ u64 this_end;
+ if (end < last_start)
+ this_end = end;
+ else
+ this_end = last_start -1;
+ err = insert_state(tree, prealloc, start, this_end,
+ bits);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ start = this_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | ---------- state ---------- |
+ * We need to split the extent, and set the bit
+ * on the first half
+ */
+ err = split_state(tree, state, prealloc, end + 1);
+ BUG_ON(err == -EEXIST);
+
+ state->state |= bits;
+ merge_state(tree, prealloc);
+ prealloc = NULL;
+out:
+ if (prealloc)
+ btrfs_free_extent_state(prealloc);
+ return err;
+search_again:
+ if (start > end)
+ goto out;
+ goto again;
+}
+
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
+{
+ return set_extent_bits(tree, start, end, EXTENT_DIRTY);
+}
+
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
+{
+ return clear_extent_bits(tree, start, end, EXTENT_DIRTY);
+}
+
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, int bits)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 1;
+
+ /*
+ * this search will find all the extents that end after
+ * our range starts.
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node)
+ goto out;
+
+ while(1) {
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->end >= start && (state->state & bits)) {
+ *start_ret = state->start;
+ *end_ret = state->end;
+ ret = 0;
+ break;
+ }
+ node = next_cache_extent(node);
+ if (!node)
+ break;
+ }
+out:
+ return ret;
+}
+
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int filled)
+{
+ struct extent_state *state = NULL;
+ struct cache_extent *node;
+ int bitset = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ while (node && start <= end) {
+ state = container_of(node, struct extent_state, cache_node);
+
+ if (filled && state->start > start) {
+ bitset = 0;
+ break;
+ }
+ if (state->start > end)
+ break;
+ if (state->state & bits) {
+ bitset = 1;
+ if (!filled)
+ break;
+ } else if (filled) {
+ bitset = 0;
+ break;
+ }
+ start = state->end + 1;
+ if (start > end)
+ break;
+ node = next_cache_extent(node);
+ if (!node) {
+ if (filled)
+ bitset = 0;
+ break;
+ }
+ }
+ return bitset;
+}
+
+int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start != start) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state->xprivate = private;
+out:
+ return ret;
+}
+
+int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start != start) {
+ ret = -ENOENT;
+ goto out;
+ }
+ *private = state->xprivate;
+out:
+ return ret;
+}
+
+static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb;
+
+ eb = calloc(1, sizeof(struct extent_buffer));
+ if (!eb)
+ return NULL;
+ eb->data = malloc_cache_aligned(blocksize);
+ if (!eb->data) {
+ free(eb);
+ return NULL;
+ }
+
+ eb->start = bytenr;
+ eb->len = blocksize;
+ eb->refs = 1;
+ eb->flags = 0;
+ eb->cache_node.start = bytenr;
+ eb->cache_node.size = blocksize;
+ eb->fs_info = info;
+ memset_extent_buffer(eb, 0, 0, blocksize);
+
+ return eb;
+}
+
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
+{
+ struct extent_buffer *new;
+
+ new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
+ if (!new)
+ return NULL;
+
+ copy_extent_buffer(new, src, 0, 0, src->len);
+ new->flags |= EXTENT_BUFFER_DUMMY;
+
+ return new;
+}
+
+static void free_extent_buffer_final(struct extent_buffer *eb)
+{
+ BUG_ON(eb->refs);
+ if (!(eb->flags & EXTENT_BUFFER_DUMMY)) {
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+
+ remove_cache_extent(&tree->cache, &eb->cache_node);
+ BUG_ON(tree->cache_size < eb->len);
+ tree->cache_size -= eb->len;
+ }
+ free(eb->data);
+ free(eb);
+}
+
+static void free_extent_buffer_internal(struct extent_buffer *eb, bool free_now)
+{
+ if (!eb || IS_ERR(eb))
+ return;
+
+ eb->refs--;
+ BUG_ON(eb->refs < 0);
+ if (eb->refs == 0) {
+ if (eb->flags & EXTENT_DIRTY) {
+ error(
+ "dirty eb leak (aborted trans): start %llu len %u",
+ eb->start, eb->len);
+ }
+ if (eb->flags & EXTENT_BUFFER_DUMMY || free_now)
+ free_extent_buffer_final(eb);
+ }
+}
+
+void free_extent_buffer(struct extent_buffer *eb)
+{
+ free_extent_buffer_internal(eb, 1);
+}
+
+struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb = NULL;
+ struct cache_extent *cache;
+
+ cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
+ if (cache && cache->start == bytenr &&
+ cache->size == blocksize) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ }
+ return eb;
+}
+
+struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
+ u64 start)
+{
+ struct extent_buffer *eb = NULL;
+ struct cache_extent *cache;
+
+ cache = search_cache_extent(&tree->cache, start);
+ if (cache) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ }
+ return eb;
+}
+
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb;
+ struct extent_io_tree *tree = &fs_info->extent_cache;
+ struct cache_extent *cache;
+
+ cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
+ if (cache && cache->start == bytenr &&
+ cache->size == blocksize) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ } else {
+ int ret;
+
+ if (cache) {
+ eb = container_of(cache, struct extent_buffer,
+ cache_node);
+ free_extent_buffer(eb);
+ }
+ eb = __alloc_extent_buffer(fs_info, bytenr, blocksize);
+ if (!eb)
+ return NULL;
+ ret = insert_cache_extent(&tree->cache, &eb->cache_node);
+ if (ret) {
+ free(eb);
+ return NULL;
+ }
+ tree->cache_size += blocksize;
+ }
+ return eb;
+}
+
+/*
+ * Allocate a dummy extent buffer which won't be inserted into extent buffer
+ * cache.
+ *
+ * This mostly allows super block read write using existing eb infrastructure
+ * without pulluting the eb cache.
+ *
+ * This is especially important to avoid injecting eb->start == SZ_64K, as
+ * fuzzed image could have invalid tree bytenr covers super block range,
+ * and cause ref count underflow.
+ */
+struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *ret;
+
+ ret = __alloc_extent_buffer(fs_info, bytenr, blocksize);
+ if (!ret)
+ return NULL;
+
+ ret->flags |= EXTENT_BUFFER_DUMMY;
+
+ return ret;
+}
+
+int read_extent_from_disk(struct blk_desc *desc, disk_partition_t *part,
+ u64 physical, struct extent_buffer *eb,
+ unsigned long offset, unsigned long len)
+{
+ int ret;
+
+ ret = __btrfs_devread(desc, part, eb->data + offset, len, physical);
+ if (ret < 0)
+ goto out;
+ if (ret != len) {
+ ret = -EIO;
+ goto out;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+ unsigned long start, unsigned long len)
+{
+ return memcmp(eb->data + start, ptrv, len);
+}
+
+void read_extent_buffer(const struct extent_buffer *eb, void *dst,
+ unsigned long start, unsigned long len)
+{
+ memcpy(dst, eb->data + start, len);
+}
+
+void write_extent_buffer(struct extent_buffer *eb, const void *src,
+ unsigned long start, unsigned long len)
+{
+ memcpy(eb->data + start, src, len);
+}
+
+void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
+ unsigned long dst_offset, unsigned long src_offset,
+ unsigned long len)
+{
+ memcpy(dst->data + dst_offset, src->data + src_offset, len);
+}
+
+void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+ unsigned long src_offset, unsigned long len)
+{
+ memmove(dst->data + dst_offset, dst->data + src_offset, len);
+}
+
+void memset_extent_buffer(struct extent_buffer *eb, char c,
+ unsigned long start, unsigned long len)
+{
+ memset(eb->data + start, c, len);
+}
+
+int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+ unsigned long nr)
+{
+ return le_test_bit(nr, (u8 *)eb->data + start);
+}
+
+int set_extent_buffer_dirty(struct extent_buffer *eb)
+{
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+ if (!(eb->flags & EXTENT_DIRTY)) {
+ eb->flags |= EXTENT_DIRTY;
+ set_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
+ extent_buffer_get(eb);
+ }
+ return 0;
+}
+
+int clear_extent_buffer_dirty(struct extent_buffer *eb)
+{
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+ if (eb->flags & EXTENT_DIRTY) {
+ eb->flags &= ~EXTENT_DIRTY;
+ clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
+ free_extent_buffer(eb);
+ }
+ return 0;
+}
+
diff --git a/fs/btrfs/extent-io.h b/fs/btrfs/extent-io.h
new file mode 100644
index 000000000000..e8fb52b26b87
--- /dev/null
+++ b/fs/btrfs/extent-io.h
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from btrfs-progs/extent_io.h
+ *
+ * Modification includes:
+ * - extent_buffer:data
+ * Use pointer to provide better alignment.
+ * - Remove max_cache_size related interfaces
+ * Includes free_extent_buffer_nocache()
+ * As we don't cache eb in U-boot.
+ * - Include headers
+ *
+ * Write related functions are kept as we still need to modify dummy extent
+ * buffers even in RO environment.
+ */
+#ifndef __BTRFS_EXTENT_IO_H__
+#define __BTRFS_EXTENT_IO_H__
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/bitops.h>
+#include <fs_internal.h>
+#include "extent-cache.h"
+
+#define EXTENT_DIRTY (1U << 0)
+#define EXTENT_WRITEBACK (1U << 1)
+#define EXTENT_UPTODATE (1U << 2)
+#define EXTENT_LOCKED (1U << 3)
+#define EXTENT_NEW (1U << 4)
+#define EXTENT_DELALLOC (1U << 5)
+#define EXTENT_DEFRAG (1U << 6)
+#define EXTENT_DEFRAG_DONE (1U << 7)
+#define EXTENT_BUFFER_FILLED (1U << 8)
+#define EXTENT_CSUM (1U << 9)
+#define EXTENT_BAD_TRANSID (1U << 10)
+#define EXTENT_BUFFER_DUMMY (1U << 11)
+#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
+
+#define BLOCK_GROUP_DATA (1U << 1)
+#define BLOCK_GROUP_METADATA (1U << 2)
+#define BLOCK_GROUP_SYSTEM (1U << 4)
+
+/*
+ * The extent buffer bitmap operations are done with byte granularity instead of
+ * word granularity for two reasons:
+ * 1. The bitmaps must be little-endian on disk.
+ * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
+ * single word in a bitmap may straddle two pages in the extent buffer.
+ */
+#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
+#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
+#define BITMAP_FIRST_BYTE_MASK(start) \
+ ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
+#define BITMAP_LAST_BYTE_MASK(nbits) \
+ (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
+
+static inline int le_test_bit(int nr, const u8 *addr)
+{
+ return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
+}
+
+struct btrfs_fs_info;
+
+struct extent_io_tree {
+ struct cache_tree state;
+ struct cache_tree cache;
+ u64 cache_size;
+};
+
+struct extent_state {
+ struct cache_extent cache_node;
+ u64 start;
+ u64 end;
+ int refs;
+ unsigned long state;
+ u64 xprivate;
+};
+
+struct extent_buffer {
+ struct cache_extent cache_node;
+ u64 start;
+ u32 len;
+ int refs;
+ u32 flags;
+ struct btrfs_fs_info *fs_info;
+ char *data;
+};
+
+static inline void extent_buffer_get(struct extent_buffer *eb)
+{
+ eb->refs++;
+}
+
+void extent_io_tree_init(struct extent_io_tree *tree);
+void extent_io_tree_cleanup(struct extent_io_tree *tree);
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, int bits);
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int filled);
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ eb->flags |= EXTENT_UPTODATE;
+ return 0;
+}
+
+static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ eb->flags &= ~EXTENT_UPTODATE;
+ return 0;
+}
+
+static inline int extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ if (!eb || IS_ERR(eb))
+ return 0;
+ if (eb->flags & EXTENT_UPTODATE)
+ return 1;
+ return 0;
+}
+
+int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
+int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
+struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+ u64 bytenr, u32 blocksize);
+struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
+ u64 start);
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
+struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
+void free_extent_buffer(struct extent_buffer *eb);
+int read_extent_from_disk(struct blk_desc *desc, disk_partition_t *part,
+ u64 physical, struct extent_buffer *eb,
+ unsigned long offset, unsigned long len);
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+ unsigned long start, unsigned long len);
+void read_extent_buffer(const struct extent_buffer *eb, void *dst,
+ unsigned long start, unsigned long len);
+void write_extent_buffer(struct extent_buffer *eb, const void *src,
+ unsigned long start, unsigned long len);
+void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
+ unsigned long dst_offset, unsigned long src_offset,
+ unsigned long len);
+void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+ unsigned long src_offset, unsigned long len);
+void memset_extent_buffer(struct extent_buffer *eb, char c,
+ unsigned long start, unsigned long len);
+int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+ unsigned long nr);
+int set_extent_buffer_dirty(struct extent_buffer *eb);
+int clear_extent_buffer_dirty(struct extent_buffer *eb);
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 06/26] fs: btrfs: Cross-port extent-io.[ch] from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This cross port brings the extent_io_tree infrastructure, with that we
could finally bring in proper btrfs_fs_info structure to ctree.h.
Also with read/write_extent_buffer() implemented, also backport
read/write_eb_member() to ctree.h.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/ctree.h | 55 +++
fs/btrfs/extent-io.c | 801 ++++++++++++++++++++++++++++++++++++++++++-
fs/btrfs/extent-io.h | 164 +++++++++
4 files changed, 1020 insertions(+), 2 deletions(-)
create mode 100644 fs/btrfs/extent-io.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 53be6e8835f2..6dac3a7e239b 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o
+ common/rbtree-utils.o extent-cache.o extent-io.o
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 02125e5e100c..c7528d1ac3db 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -11,8 +11,10 @@
#include <common.h>
#include <compiler.h>
+#include <linux/rbtree.h>
#include "kernel-shared/btrfs_tree.h"
#include "compat.h"
+#include "extent-io.h"
#define BTRFS_MAX_MIRRORS 3
@@ -48,6 +50,18 @@
#define BTRFS_FS_STATE_DEV_REPLACING 3
#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
+#define read_eb_member(eb, ptr, type, member, result) ( \
+ read_extent_buffer(eb, (char *)(result), \
+ ((unsigned long)(ptr)) + \
+ offsetof(type, member), \
+ sizeof(((type *)0)->member)))
+
+#define write_eb_member(eb, ptr, type, member, result) ( \
+ write_extent_buffer(eb, (char *)(result), \
+ ((unsigned long)(ptr)) + \
+ offsetof(type, member), \
+ sizeof(((type *)0)->member)))
+
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(const type *s) \
{ \
@@ -75,6 +89,47 @@ struct btrfs_root {
u64 root_dirid;
};
+struct btrfs_mapping_tree {
+ struct cache_tree cache_tree;
+};
+
+struct btrfs_device;
+struct btrfs_fs_info {
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *new_chunk_tree_uuid;
+ struct btrfs_root *fs_root;
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ struct btrfs_root *csum_root;
+
+ struct rb_root fs_root_tree;
+
+ struct extent_io_tree extent_cache;
+ struct extent_io_tree free_space_cache;
+ struct extent_io_tree pinned_extents;
+ struct extent_io_tree extent_ins;
+ struct extent_io_tree *excluded_extents;
+
+ struct rb_root block_group_cache_tree;
+ /* logical->physical extent mapping */
+ struct btrfs_mapping_tree mapping_tree;
+
+ u64 generation;
+ u64 last_trans_committed;
+
+ struct btrfs_super_block *super_copy;
+
+ u64 super_bytenr;
+
+ /* Only support one device yet */
+ struct btrfs_devvice *dev;
+
+ /* Cached block sizes */
+ u32 nodesize;
+ u32 sectorsize;
+ u32 stripesize;
+};
+
int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 66d0e1c7d65f..dc0832c8645f 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -5,9 +5,13 @@
* 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
*/
-#include "btrfs.h"
+#include <linux/kernel.h>
#include <malloc.h>
#include <memalign.h>
+#include "btrfs.h"
+#include "ctree.h"
+#include "extent-io.h"
+#include "disk-io.h"
u64 btrfs_read_extent_inline(struct btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
@@ -118,3 +122,798 @@ err:
free(cbuf);
return -1ULL;
}
+
+void extent_io_tree_init(struct extent_io_tree *tree)
+{
+ cache_tree_init(&tree->state);
+ cache_tree_init(&tree->cache);
+ tree->cache_size = 0;
+}
+
+static struct extent_state *alloc_extent_state(void)
+{
+ struct extent_state *state;
+
+ state = malloc(sizeof(*state));
+ if (!state)
+ return NULL;
+ state->cache_node.objectid = 0;
+ state->refs = 1;
+ state->state = 0;
+ state->xprivate = 0;
+ return state;
+}
+
+static void btrfs_free_extent_state(struct extent_state *state)
+{
+ state->refs--;
+ BUG_ON(state->refs < 0);
+ if (state->refs == 0)
+ free(state);
+}
+
+static void free_extent_state_func(struct cache_extent *cache)
+{
+ struct extent_state *es;
+
+ es = container_of(cache, struct extent_state, cache_node);
+ btrfs_free_extent_state(es);
+}
+
+static void free_extent_buffer_final(struct extent_buffer *eb);
+void extent_io_tree_cleanup(struct extent_io_tree *tree)
+{
+ cache_tree_free_extents(&tree->state, free_extent_state_func);
+}
+
+static inline void update_extent_state(struct extent_state *state)
+{
+ state->cache_node.start = state->start;
+ state->cache_node.size = state->end + 1 - state->start;
+}
+
+/*
+ * Utility function to look for merge candidates inside a given range.
+ * Any extents with matching state are merged together into a single
+ * extent in the tree. Extents with EXTENT_IO in their state field are
+ * not merged
+ */
+static int merge_state(struct extent_io_tree *tree,
+ struct extent_state *state)
+{
+ struct extent_state *other;
+ struct cache_extent *other_node;
+
+ if (state->state & EXTENT_IOBITS)
+ return 0;
+
+ other_node = prev_cache_extent(&state->cache_node);
+ if (other_node) {
+ other = container_of(other_node, struct extent_state,
+ cache_node);
+ if (other->end == state->start - 1 &&
+ other->state == state->state) {
+ state->start = other->start;
+ update_extent_state(state);
+ remove_cache_extent(&tree->state, &other->cache_node);
+ btrfs_free_extent_state(other);
+ }
+ }
+ other_node = next_cache_extent(&state->cache_node);
+ if (other_node) {
+ other = container_of(other_node, struct extent_state,
+ cache_node);
+ if (other->start == state->end + 1 &&
+ other->state == state->state) {
+ other->start = state->start;
+ update_extent_state(other);
+ remove_cache_extent(&tree->state, &state->cache_node);
+ btrfs_free_extent_state(state);
+ }
+ }
+ return 0;
+}
+
+/*
+ * insert an extent_state struct into the tree. 'bits' are set on the
+ * struct before it is inserted.
+ */
+static int insert_state(struct extent_io_tree *tree,
+ struct extent_state *state, u64 start, u64 end,
+ int bits)
+{
+ int ret;
+
+ BUG_ON(end < start);
+ state->state |= bits;
+ state->start = start;
+ state->end = end;
+ update_extent_state(state);
+ ret = insert_cache_extent(&tree->state, &state->cache_node);
+ BUG_ON(ret);
+ merge_state(tree, state);
+ return 0;
+}
+
+/*
+ * split a given extent state struct in two, inserting the preallocated
+ * struct 'prealloc' as the newly created second half. 'split' indicates an
+ * offset inside 'orig' where it should be split.
+ */
+static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
+ struct extent_state *prealloc, u64 split)
+{
+ int ret;
+ prealloc->start = orig->start;
+ prealloc->end = split - 1;
+ prealloc->state = orig->state;
+ update_extent_state(prealloc);
+ orig->start = split;
+ update_extent_state(orig);
+ ret = insert_cache_extent(&tree->state, &prealloc->cache_node);
+ BUG_ON(ret);
+ return 0;
+}
+
+/*
+ * clear some bits on a range in the tree.
+ */
+static int clear_state_bit(struct extent_io_tree *tree,
+ struct extent_state *state, int bits)
+{
+ int ret = state->state & bits;
+
+ state->state &= ~bits;
+ if (state->state == 0) {
+ remove_cache_extent(&tree->state, &state->cache_node);
+ btrfs_free_extent_state(state);
+ } else {
+ merge_state(tree, state);
+ }
+ return ret;
+}
+
+/*
+ * extent_buffer_bitmap_set - set an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to set
+ */
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
+ const unsigned int size = pos + len;
+ int bits_to_set = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
+ u8 mask_to_set = BITMAP_FIRST_BYTE_MASK(pos);
+
+ while (len >= bits_to_set) {
+ *p |= mask_to_set;
+ len -= bits_to_set;
+ bits_to_set = BITS_PER_BYTE;
+ mask_to_set = ~0;
+ p++;
+ }
+ if (len) {
+ mask_to_set &= BITMAP_LAST_BYTE_MASK(size);
+ *p |= mask_to_set;
+ }
+}
+
+/*
+ * extent_buffer_bitmap_clear - clear an area of a bitmap
+ * @eb: the extent buffer
+ * @start: offset of the bitmap item in the extent buffer
+ * @pos: bit number of the first bit
+ * @len: number of bits to clear
+ */
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len)
+{
+ u8 *p = (u8 *)eb->data + start + BIT_BYTE(pos);
+ const unsigned int size = pos + len;
+ int bits_to_clear = BITS_PER_BYTE - (pos % BITS_PER_BYTE);
+ u8 mask_to_clear = BITMAP_FIRST_BYTE_MASK(pos);
+
+ while (len >= bits_to_clear) {
+ *p &= ~mask_to_clear;
+ len -= bits_to_clear;
+ bits_to_clear = BITS_PER_BYTE;
+ mask_to_clear = ~0;
+ p++;
+ }
+ if (len) {
+ mask_to_clear &= BITMAP_LAST_BYTE_MASK(size);
+ *p &= ~mask_to_clear;
+ }
+}
+
+/*
+ * clear some bits on a range in the tree.
+ */
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct cache_extent *node;
+ u64 last_end;
+ int err;
+ int set = 0;
+
+again:
+ if (!prealloc) {
+ prealloc = alloc_extent_state();
+ if (!prealloc)
+ return -ENOMEM;
+ }
+
+ /*
+ * this search will find the extents that end after
+ * our range starts
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node)
+ goto out;
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start > end)
+ goto out;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state | or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip
+ * bits on second half.
+ *
+ * If the extent we found extends past our range, we
+ * just split and search again. It'll get split again
+ * the next time though.
+ *
+ * If the extent we found is inside our range, we clear
+ * the desired bit on it.
+ */
+ if (state->start < start) {
+ err = split_state(tree, state, prealloc, start);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ set |= clear_state_bit(tree, state, bits);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ } else {
+ start = state->start;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * We need to split the extent, and clear the bit
+ * on the first half
+ */
+ if (state->start <= end && state->end > end) {
+ err = split_state(tree, state, prealloc, end + 1);
+ BUG_ON(err == -EEXIST);
+
+ set |= clear_state_bit(tree, prealloc, bits);
+ prealloc = NULL;
+ goto out;
+ }
+
+ start = state->end + 1;
+ set |= clear_state_bit(tree, state, bits);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ goto search_again;
+out:
+ if (prealloc)
+ btrfs_free_extent_state(prealloc);
+ return set;
+
+search_again:
+ if (start > end)
+ goto out;
+ goto again;
+}
+
+/*
+ * set some bits on a range in the tree.
+ */
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct cache_extent *node;
+ int err = 0;
+ u64 last_start;
+ u64 last_end;
+again:
+ if (!prealloc) {
+ prealloc = alloc_extent_state();
+ if (!prealloc)
+ return -ENOMEM;
+ }
+
+ /*
+ * this search will find the extents that end after
+ * our range starts
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ err = insert_state(tree, prealloc, start, end, bits);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ goto out;
+ }
+
+ state = container_of(node, struct extent_state, cache_node);
+ last_start = state->start;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * Just lock what we found and keep going
+ */
+ if (state->start == start && state->end <= end) {
+ state->state |= bits;
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip bits on
+ * second half.
+ *
+ * If the extent we found extends past our
+ * range, we just split and search again. It'll get split
+ * again the next time though.
+ *
+ * If the extent we found is inside our range, we set the
+ * desired bit on it.
+ */
+ if (state->start < start) {
+ err = split_state(tree, state, prealloc, start);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ state->state |= bits;
+ start = state->end + 1;
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ } else {
+ start = state->start;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state | or | state |
+ *
+ * There's a hole, we need to insert something in it and
+ * ignore the extent we found.
+ */
+ if (state->start > start) {
+ u64 this_end;
+ if (end < last_start)
+ this_end = end;
+ else
+ this_end = last_start -1;
+ err = insert_state(tree, prealloc, start, this_end,
+ bits);
+ BUG_ON(err == -EEXIST);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ start = this_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | ---------- state ---------- |
+ * We need to split the extent, and set the bit
+ * on the first half
+ */
+ err = split_state(tree, state, prealloc, end + 1);
+ BUG_ON(err == -EEXIST);
+
+ state->state |= bits;
+ merge_state(tree, prealloc);
+ prealloc = NULL;
+out:
+ if (prealloc)
+ btrfs_free_extent_state(prealloc);
+ return err;
+search_again:
+ if (start > end)
+ goto out;
+ goto again;
+}
+
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
+{
+ return set_extent_bits(tree, start, end, EXTENT_DIRTY);
+}
+
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end)
+{
+ return clear_extent_bits(tree, start, end, EXTENT_DIRTY);
+}
+
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, int bits)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 1;
+
+ /*
+ * this search will find all the extents that end after
+ * our range starts.
+ */
+ node = search_cache_extent(&tree->state, start);
+ if (!node)
+ goto out;
+
+ while(1) {
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->end >= start && (state->state & bits)) {
+ *start_ret = state->start;
+ *end_ret = state->end;
+ ret = 0;
+ break;
+ }
+ node = next_cache_extent(node);
+ if (!node)
+ break;
+ }
+out:
+ return ret;
+}
+
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int filled)
+{
+ struct extent_state *state = NULL;
+ struct cache_extent *node;
+ int bitset = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ while (node && start <= end) {
+ state = container_of(node, struct extent_state, cache_node);
+
+ if (filled && state->start > start) {
+ bitset = 0;
+ break;
+ }
+ if (state->start > end)
+ break;
+ if (state->state & bits) {
+ bitset = 1;
+ if (!filled)
+ break;
+ } else if (filled) {
+ bitset = 0;
+ break;
+ }
+ start = state->end + 1;
+ if (start > end)
+ break;
+ node = next_cache_extent(node);
+ if (!node) {
+ if (filled)
+ bitset = 0;
+ break;
+ }
+ }
+ return bitset;
+}
+
+int set_state_private(struct extent_io_tree *tree, u64 start, u64 private)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start != start) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state->xprivate = private;
+out:
+ return ret;
+}
+
+int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private)
+{
+ struct cache_extent *node;
+ struct extent_state *state;
+ int ret = 0;
+
+ node = search_cache_extent(&tree->state, start);
+ if (!node) {
+ ret = -ENOENT;
+ goto out;
+ }
+ state = container_of(node, struct extent_state, cache_node);
+ if (state->start != start) {
+ ret = -ENOENT;
+ goto out;
+ }
+ *private = state->xprivate;
+out:
+ return ret;
+}
+
+static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb;
+
+ eb = calloc(1, sizeof(struct extent_buffer));
+ if (!eb)
+ return NULL;
+ eb->data = malloc_cache_aligned(blocksize);
+ if (!eb->data) {
+ free(eb);
+ return NULL;
+ }
+
+ eb->start = bytenr;
+ eb->len = blocksize;
+ eb->refs = 1;
+ eb->flags = 0;
+ eb->cache_node.start = bytenr;
+ eb->cache_node.size = blocksize;
+ eb->fs_info = info;
+ memset_extent_buffer(eb, 0, 0, blocksize);
+
+ return eb;
+}
+
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
+{
+ struct extent_buffer *new;
+
+ new = __alloc_extent_buffer(src->fs_info, src->start, src->len);
+ if (!new)
+ return NULL;
+
+ copy_extent_buffer(new, src, 0, 0, src->len);
+ new->flags |= EXTENT_BUFFER_DUMMY;
+
+ return new;
+}
+
+static void free_extent_buffer_final(struct extent_buffer *eb)
+{
+ BUG_ON(eb->refs);
+ if (!(eb->flags & EXTENT_BUFFER_DUMMY)) {
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+
+ remove_cache_extent(&tree->cache, &eb->cache_node);
+ BUG_ON(tree->cache_size < eb->len);
+ tree->cache_size -= eb->len;
+ }
+ free(eb->data);
+ free(eb);
+}
+
+static void free_extent_buffer_internal(struct extent_buffer *eb, bool free_now)
+{
+ if (!eb || IS_ERR(eb))
+ return;
+
+ eb->refs--;
+ BUG_ON(eb->refs < 0);
+ if (eb->refs == 0) {
+ if (eb->flags & EXTENT_DIRTY) {
+ error(
+ "dirty eb leak (aborted trans): start %llu len %u",
+ eb->start, eb->len);
+ }
+ if (eb->flags & EXTENT_BUFFER_DUMMY || free_now)
+ free_extent_buffer_final(eb);
+ }
+}
+
+void free_extent_buffer(struct extent_buffer *eb)
+{
+ free_extent_buffer_internal(eb, 1);
+}
+
+struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb = NULL;
+ struct cache_extent *cache;
+
+ cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
+ if (cache && cache->start == bytenr &&
+ cache->size == blocksize) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ }
+ return eb;
+}
+
+struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
+ u64 start)
+{
+ struct extent_buffer *eb = NULL;
+ struct cache_extent *cache;
+
+ cache = search_cache_extent(&tree->cache, start);
+ if (cache) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ }
+ return eb;
+}
+
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *eb;
+ struct extent_io_tree *tree = &fs_info->extent_cache;
+ struct cache_extent *cache;
+
+ cache = lookup_cache_extent(&tree->cache, bytenr, blocksize);
+ if (cache && cache->start == bytenr &&
+ cache->size == blocksize) {
+ eb = container_of(cache, struct extent_buffer, cache_node);
+ eb->refs++;
+ } else {
+ int ret;
+
+ if (cache) {
+ eb = container_of(cache, struct extent_buffer,
+ cache_node);
+ free_extent_buffer(eb);
+ }
+ eb = __alloc_extent_buffer(fs_info, bytenr, blocksize);
+ if (!eb)
+ return NULL;
+ ret = insert_cache_extent(&tree->cache, &eb->cache_node);
+ if (ret) {
+ free(eb);
+ return NULL;
+ }
+ tree->cache_size += blocksize;
+ }
+ return eb;
+}
+
+/*
+ * Allocate a dummy extent buffer which won't be inserted into extent buffer
+ * cache.
+ *
+ * This mostly allows super block read write using existing eb infrastructure
+ * without pulluting the eb cache.
+ *
+ * This is especially important to avoid injecting eb->start == SZ_64K, as
+ * fuzzed image could have invalid tree bytenr covers super block range,
+ * and cause ref count underflow.
+ */
+struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ struct extent_buffer *ret;
+
+ ret = __alloc_extent_buffer(fs_info, bytenr, blocksize);
+ if (!ret)
+ return NULL;
+
+ ret->flags |= EXTENT_BUFFER_DUMMY;
+
+ return ret;
+}
+
+int read_extent_from_disk(struct blk_desc *desc, disk_partition_t *part,
+ u64 physical, struct extent_buffer *eb,
+ unsigned long offset, unsigned long len)
+{
+ int ret;
+
+ ret = __btrfs_devread(desc, part, eb->data + offset, len, physical);
+ if (ret < 0)
+ goto out;
+ if (ret != len) {
+ ret = -EIO;
+ goto out;
+ }
+ ret = 0;
+out:
+ return ret;
+}
+
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+ unsigned long start, unsigned long len)
+{
+ return memcmp(eb->data + start, ptrv, len);
+}
+
+void read_extent_buffer(const struct extent_buffer *eb, void *dst,
+ unsigned long start, unsigned long len)
+{
+ memcpy(dst, eb->data + start, len);
+}
+
+void write_extent_buffer(struct extent_buffer *eb, const void *src,
+ unsigned long start, unsigned long len)
+{
+ memcpy(eb->data + start, src, len);
+}
+
+void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
+ unsigned long dst_offset, unsigned long src_offset,
+ unsigned long len)
+{
+ memcpy(dst->data + dst_offset, src->data + src_offset, len);
+}
+
+void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+ unsigned long src_offset, unsigned long len)
+{
+ memmove(dst->data + dst_offset, dst->data + src_offset, len);
+}
+
+void memset_extent_buffer(struct extent_buffer *eb, char c,
+ unsigned long start, unsigned long len)
+{
+ memset(eb->data + start, c, len);
+}
+
+int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+ unsigned long nr)
+{
+ return le_test_bit(nr, (u8 *)eb->data + start);
+}
+
+int set_extent_buffer_dirty(struct extent_buffer *eb)
+{
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+ if (!(eb->flags & EXTENT_DIRTY)) {
+ eb->flags |= EXTENT_DIRTY;
+ set_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
+ extent_buffer_get(eb);
+ }
+ return 0;
+}
+
+int clear_extent_buffer_dirty(struct extent_buffer *eb)
+{
+ struct extent_io_tree *tree = &eb->fs_info->extent_cache;
+ if (eb->flags & EXTENT_DIRTY) {
+ eb->flags &= ~EXTENT_DIRTY;
+ clear_extent_dirty(tree, eb->start, eb->start + eb->len - 1);
+ free_extent_buffer(eb);
+ }
+ return 0;
+}
+
diff --git a/fs/btrfs/extent-io.h b/fs/btrfs/extent-io.h
new file mode 100644
index 000000000000..e8fb52b26b87
--- /dev/null
+++ b/fs/btrfs/extent-io.h
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Cross-ported from btrfs-progs/extent_io.h
+ *
+ * Modification includes:
+ * - extent_buffer:data
+ * Use pointer to provide better alignment.
+ * - Remove max_cache_size related interfaces
+ * Includes free_extent_buffer_nocache()
+ * As we don't cache eb in U-boot.
+ * - Include headers
+ *
+ * Write related functions are kept as we still need to modify dummy extent
+ * buffers even in RO environment.
+ */
+#ifndef __BTRFS_EXTENT_IO_H__
+#define __BTRFS_EXTENT_IO_H__
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/bitops.h>
+#include <fs_internal.h>
+#include "extent-cache.h"
+
+#define EXTENT_DIRTY (1U << 0)
+#define EXTENT_WRITEBACK (1U << 1)
+#define EXTENT_UPTODATE (1U << 2)
+#define EXTENT_LOCKED (1U << 3)
+#define EXTENT_NEW (1U << 4)
+#define EXTENT_DELALLOC (1U << 5)
+#define EXTENT_DEFRAG (1U << 6)
+#define EXTENT_DEFRAG_DONE (1U << 7)
+#define EXTENT_BUFFER_FILLED (1U << 8)
+#define EXTENT_CSUM (1U << 9)
+#define EXTENT_BAD_TRANSID (1U << 10)
+#define EXTENT_BUFFER_DUMMY (1U << 11)
+#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
+
+#define BLOCK_GROUP_DATA (1U << 1)
+#define BLOCK_GROUP_METADATA (1U << 2)
+#define BLOCK_GROUP_SYSTEM (1U << 4)
+
+/*
+ * The extent buffer bitmap operations are done with byte granularity instead of
+ * word granularity for two reasons:
+ * 1. The bitmaps must be little-endian on disk.
+ * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
+ * single word in a bitmap may straddle two pages in the extent buffer.
+ */
+#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
+#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
+#define BITMAP_FIRST_BYTE_MASK(start) \
+ ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
+#define BITMAP_LAST_BYTE_MASK(nbits) \
+ (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
+
+static inline int le_test_bit(int nr, const u8 *addr)
+{
+ return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
+}
+
+struct btrfs_fs_info;
+
+struct extent_io_tree {
+ struct cache_tree state;
+ struct cache_tree cache;
+ u64 cache_size;
+};
+
+struct extent_state {
+ struct cache_extent cache_node;
+ u64 start;
+ u64 end;
+ int refs;
+ unsigned long state;
+ u64 xprivate;
+};
+
+struct extent_buffer {
+ struct cache_extent cache_node;
+ u64 start;
+ u32 len;
+ int refs;
+ u32 flags;
+ struct btrfs_fs_info *fs_info;
+ char *data;
+};
+
+static inline void extent_buffer_get(struct extent_buffer *eb)
+{
+ eb->refs++;
+}
+
+void extent_io_tree_init(struct extent_io_tree *tree);
+void extent_io_tree_cleanup(struct extent_io_tree *tree);
+int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
+int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, int bits);
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, int bits);
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ int bits, int filled);
+int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end);
+static inline int set_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ eb->flags |= EXTENT_UPTODATE;
+ return 0;
+}
+
+static inline int clear_extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ eb->flags &= ~EXTENT_UPTODATE;
+ return 0;
+}
+
+static inline int extent_buffer_uptodate(struct extent_buffer *eb)
+{
+ if (!eb || IS_ERR(eb))
+ return 0;
+ if (eb->flags & EXTENT_UPTODATE)
+ return 1;
+ return 0;
+}
+
+int set_state_private(struct extent_io_tree *tree, u64 start, u64 xprivate);
+int get_state_private(struct extent_io_tree *tree, u64 start, u64 *xprivate);
+struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
+ u64 bytenr, u32 blocksize);
+struct extent_buffer *find_first_extent_buffer(struct extent_io_tree *tree,
+ u64 start);
+struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
+struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
+struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
+void free_extent_buffer(struct extent_buffer *eb);
+int read_extent_from_disk(struct blk_desc *desc, disk_partition_t *part,
+ u64 physical, struct extent_buffer *eb,
+ unsigned long offset, unsigned long len);
+int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv,
+ unsigned long start, unsigned long len);
+void read_extent_buffer(const struct extent_buffer *eb, void *dst,
+ unsigned long start, unsigned long len);
+void write_extent_buffer(struct extent_buffer *eb, const void *src,
+ unsigned long start, unsigned long len);
+void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
+ unsigned long dst_offset, unsigned long src_offset,
+ unsigned long len);
+void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
+ unsigned long src_offset, unsigned long len);
+void memset_extent_buffer(struct extent_buffer *eb, char c,
+ unsigned long start, unsigned long len);
+int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
+ unsigned long nr);
+int set_extent_buffer_dirty(struct extent_buffer *eb);
+int clear_extent_buffer_dirty(struct extent_buffer *eb);
+void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
+void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
+ unsigned long pos, unsigned long len);
+
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 07/26] fs: btrfs: Cross port structure accessor into ctree.h
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This will include all structure accessor from btrfs-progs/ctree.h, which
is also the same as kernel ctree.h.
All these accessor handles the endian convert at runtime, and since all
of them are defined as static inline functions, even we don't use them
they won't take extra text space.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/compat.h | 14 +
fs/btrfs/ctree.h | 1136 ++++++++++++++++++++++++++++++++++++++++----
fs/btrfs/disk-io.h | 9 -
3 files changed, 1064 insertions(+), 95 deletions(-)
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 376a035cd6db..64e8b8ab3dfb 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -23,6 +23,20 @@
#define cpu_to_le8(v) (v)
#define __le8 u8
+/*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+#define get_unaligned_le8(p) (*((u8 *)(p)))
+#define get_unaligned_8(p) (*((u8 *)(p)))
+#define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
+#define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
+
/*
* Read data from device specified by @desc and @part
*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c7528d1ac3db..65ec8256d44b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -12,7 +12,10 @@
#include <common.h>
#include <compiler.h>
#include <linux/rbtree.h>
+#include <linux/unaligned/le_byteshift.h>
+#include <u-boot/crc.h>
#include "kernel-shared/btrfs_tree.h"
+#include "crypto/hash.h"
#include "compat.h"
#include "extent-io.h"
@@ -34,6 +37,20 @@
/* four bytes for CRC32 */
#define BTRFS_EMPTY_DIR_SIZE 0
+struct btrfs_mapping_tree {
+ struct cache_tree cache_tree;
+};
+
+static inline unsigned long btrfs_chunk_item_size(int num_stripes)
+{
+ BUG_ON(num_stripes == 0);
+ return sizeof(struct btrfs_chunk) +
+ sizeof(struct btrfs_stripe) * (num_stripes - 1);
+}
+
+#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
+#define BTRFS_LEAF_DATA_SIZE(fs_info) \
+ (__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
@@ -41,6 +58,35 @@
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
+struct btrfs_device;
+struct btrfs_fs_devices;
+struct btrfs_fs_info {
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *new_chunk_tree_uuid;
+ struct btrfs_root *fs_root;
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ struct btrfs_root *csum_root;
+
+ struct rb_root fs_root_tree;
+
+ struct extent_io_tree extent_cache;
+
+ /* logical->physical extent mapping */
+ struct btrfs_mapping_tree mapping_tree;
+
+ u64 last_trans_committed;
+
+ struct btrfs_super_block *super_copy;
+
+ struct btrfs_fs_devices *fs_devices;
+
+ /* Cached block sizes */
+ u32 nodesize;
+ u32 sectorsize;
+ u32 stripesize;
+};
+
/*
* File system states
*/
@@ -62,6 +108,35 @@
offsetof(type, member), \
sizeof(((type *)0)->member)))
+#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
+{ \
+ const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ return le##bits##_to_cpu(h->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ u##bits val) \
+{ \
+ struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ h->member = cpu_to_le##bits(val); \
+}
+
+#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
+ const type *s) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ const type *p = (type *) (eb->data + offset); \
+ return get_unaligned_le##bits(&p->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ type *s, u##bits val) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ type *p = (type *) (eb->data + offset); \
+ put_unaligned_le##bits(val, &p->member); \
+}
+
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(const type *s) \
{ \
@@ -72,126 +147,721 @@ static inline void btrfs_set_##name(type *s, u##bits val) \
s->member = cpu_to_le##bits(val); \
}
-union btrfs_tree_node {
- struct btrfs_header header;
- struct btrfs_leaf leaf;
- struct btrfs_node node;
-};
+BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
+BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
+BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
+BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
+BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
+ start_offset, 64);
+BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
+BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
+BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
+BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
+BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
-struct btrfs_path {
- union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
- u32 slots[BTRFS_MAX_LEVEL];
-};
+BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
+ dev_group, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
+ seek_speed, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
+ bandwidth, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
+ generation, 64);
-struct btrfs_root {
- u64 objectid;
- u64 bytenr;
- u64 root_dirid;
-};
+static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, uuid);
+}
-struct btrfs_mapping_tree {
- struct cache_tree cache_tree;
-};
+static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, fsid);
+}
-struct btrfs_device;
-struct btrfs_fs_info {
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *new_chunk_tree_uuid;
- struct btrfs_root *fs_root;
- struct btrfs_root *tree_root;
- struct btrfs_root *chunk_root;
- struct btrfs_root *csum_root;
+BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
+BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
+BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
+BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
+BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
+BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
+BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
- struct rb_root fs_root_tree;
+static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
+{
+ return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
+}
- struct extent_io_tree extent_cache;
- struct extent_io_tree free_space_cache;
- struct extent_io_tree pinned_extents;
- struct extent_io_tree extent_ins;
- struct extent_io_tree *excluded_extents;
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
+ stripe_len, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
+ num_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
+ sub_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
- struct rb_root block_group_cache_tree;
- /* logical->physical extent mapping */
- struct btrfs_mapping_tree mapping_tree;
+static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
+ int nr)
+{
+ unsigned long offset = (unsigned long)c;
+ offset += offsetof(struct btrfs_chunk, stripe);
+ offset += nr * sizeof(struct btrfs_stripe);
+ return (struct btrfs_stripe *)offset;
+}
- u64 generation;
- u64 last_trans_committed;
+static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
+}
- struct btrfs_super_block *super_copy;
+static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
+}
- u64 super_bytenr;
+static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
+}
- /* Only support one device yet */
- struct btrfs_devvice *dev;
+static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
+}
- /* Cached block sizes */
- u32 nodesize;
- u32 sectorsize;
- u32 stripesize;
-};
+static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
+}
-int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
-int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void btrfs_free_path(struct btrfs_path *);
-int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_path *);
-int btrfs_prev_slot(struct btrfs_path *);
-int btrfs_next_slot(struct btrfs_path *);
+/* struct btrfs_block_group_item */
+BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
-static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
- /* At tree read time we have converted the endian for btrfs_disk_key */
- return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
+BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+
+/* struct btrfs_free_space_info */
+BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
+ extent_count, 32);
+BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
+
+/* struct btrfs_inode_ref */
+BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
+
+/* struct btrfs_inode_extref */
+BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
+ parent_objectid, 64);
+BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
+ name_len, 16);
+BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
+
+/* struct btrfs_inode_item */
+BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
+BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
+BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
+ struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
+ struct btrfs_inode_item, sequence, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
+ struct btrfs_inode_item, transid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
+ struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
+ struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
+ struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
+ struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
+ struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
+ struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
+ struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
+ struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
+ struct btrfs_inode_item, flags, 64);
+
+static inline struct btrfs_timespec *
+btrfs_inode_atime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, atime);
+ return (struct btrfs_timespec *)ptr;
}
-static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
- u8 type, struct btrfs_path *path)
+static inline struct btrfs_timespec *
+btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
{
- struct btrfs_key key, *res;
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, mtime);
+ return (struct btrfs_timespec *)ptr;
+}
- key.objectid = objectid;
- key.type = type;
- key.offset = 0;
+static inline struct btrfs_timespec *
+btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, ctime);
+ return (struct btrfs_timespec *)ptr;
+}
- if (btrfs_search_tree(root, &key, path))
- return NULL;
+static inline struct btrfs_timespec *
+btrfs_inode_otime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, otime);
+ return (struct btrfs_timespec *)ptr;
+}
- res = btrfs_path_leaf_key(path);
- if (btrfs_comp_keys_type(&key, res)) {
- btrfs_free_path(path);
- return NULL;
- }
+BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
+BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
+ sec, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
+ nsec, 32);
- return res;
+/* struct btrfs_dev_extent */
+BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
+ chunk_tree, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
+ chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
+ chunk_offset, 64);
+BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
+ length, 64);
+
+static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
+{
+ unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
+ return (u8 *)((unsigned long)dev + ptr);
}
-static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+
+/* struct btrfs_extent_item */
+BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
+BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
+
+BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
+
+BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
+
+static inline void btrfs_tree_block_key(struct extent_buffer *eb,
+ struct btrfs_tree_block_info *item,
+ struct btrfs_disk_key *key)
{
- return p->nodes[0]->leaf.items[p->slots[0]].size;
+ read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}
-static inline void *btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
+ struct btrfs_tree_block_info *item,
+ struct btrfs_disk_key *key)
{
- return ((u8 *) leaf) + sizeof(struct btrfs_header)
- + leaf->items[slot].offset;
+ write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}
-static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
+ root, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
+ objectid, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
+ offset, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
+ count, 32);
+
+BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
+ count, 32);
+
+BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
+ type, 8);
+BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
+ offset, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
+ struct btrfs_extent_inline_ref, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
+ struct btrfs_extent_inline_ref, offset, 64);
+
+static inline u32 btrfs_extent_inline_ref_size(int type)
{
- return btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
+ if (type == BTRFS_TREE_BLOCK_REF_KEY ||
+ type == BTRFS_SHARED_BLOCK_REF_KEY)
+ return sizeof(struct btrfs_extent_inline_ref);
+ if (type == BTRFS_SHARED_DATA_REF_KEY)
+ return sizeof(struct btrfs_shared_data_ref) +
+ sizeof(struct btrfs_extent_inline_ref);
+ if (type == BTRFS_EXTENT_DATA_REF_KEY)
+ return sizeof(struct btrfs_extent_data_ref) +
+ offsetof(struct btrfs_extent_inline_ref, offset);
+ BUG();
+ return 0;
}
-#define btrfs_item_ptr(l,s,t) \
- ((t *) btrfs_leaf_data((l),(s)))
+BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
+BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
+ generation, 64);
+BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
+BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
-#define btrfs_path_item_ptr(p,t) \
- ((t *) btrfs_path_leaf_data((p)))
+/* struct btrfs_node */
+BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
+BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
-u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
-const char *btrfs_super_csum_name(u16 csum_type);
-u16 btrfs_csum_type_size(u16 csum_type);
-size_t btrfs_super_num_csums(void);
+static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline unsigned long btrfs_node_key_ptr_offset(int nr)
+{
+ return offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+}
+
+static inline void btrfs_node_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ unsigned long ptr;
+ ptr = btrfs_node_key_ptr_offset(nr);
+ read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
+ struct btrfs_key_ptr, key, disk_key);
+}
+
+static inline void btrfs_set_node_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ unsigned long ptr;
+ ptr = btrfs_node_key_ptr_offset(nr);
+ write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
+ struct btrfs_key_ptr, key, disk_key);
+}
+
+/* struct btrfs_item */
+BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
+BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
+
+static inline unsigned long btrfs_item_nr_offset(int nr)
+{
+ return offsetof(struct btrfs_leaf, items) +
+ sizeof(struct btrfs_item) * nr;
+}
+
+static inline struct btrfs_item *btrfs_item_nr(int nr)
+{
+ return (struct btrfs_item *)btrfs_item_nr_offset(nr);
+}
+
+static inline u32 btrfs_item_end(struct extent_buffer *eb,
+ struct btrfs_item *item)
+{
+ return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
+}
+
+static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_end(eb, btrfs_item_nr(nr));
+}
+
+static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_offset(eb, btrfs_item_nr(nr));
+}
+
+static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_size(eb, btrfs_item_nr(nr));
+}
+
+static inline void btrfs_item_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ struct btrfs_item *item = btrfs_item_nr(nr);
+ read_eb_member(eb, item, struct btrfs_item, key, disk_key);
+}
+
+static inline void btrfs_set_item_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ struct btrfs_item *item = btrfs_item_nr(nr);
+ write_eb_member(eb, item, struct btrfs_item, key, disk_key);
+}
+
+BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
+
+/*
+ * struct btrfs_root_ref
+ */
+BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
+BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
+BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
+
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
+
+/* struct btrfs_dir_item */
+BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
+BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
+BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
+
+static inline void btrfs_dir_item_key(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_disk_key *key)
+{
+ read_eb_member(eb, item, struct btrfs_dir_item, location, key);
+}
+
+static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_disk_key *key)
+{
+ write_eb_member(eb, item, struct btrfs_dir_item, location, key);
+}
+
+/* struct btrfs_free_space_header */
+BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
+ num_entries, 64);
+BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
+ num_bitmaps, 64);
+BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
+ generation, 64);
+
+static inline void btrfs_free_space_key(struct extent_buffer *eb,
+ struct btrfs_free_space_header *h,
+ struct btrfs_disk_key *key)
+{
+ read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
+}
+
+static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
+ struct btrfs_free_space_header *h,
+ struct btrfs_disk_key *key)
+{
+ write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
+}
+
+/* struct btrfs_disk_key */
+BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
+ objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
+
+static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
+ struct btrfs_disk_key *disk)
+{
+ cpu->offset = le64_to_cpu(disk->offset);
+ cpu->type = disk->type;
+ cpu->objectid = le64_to_cpu(disk->objectid);
+}
+
+static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
+ const struct btrfs_key *cpu)
+{
+ disk->offset = cpu_to_le64(cpu->offset);
+ disk->type = cpu->type;
+ disk->objectid = cpu_to_le64(cpu->objectid);
+}
+
+static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_node_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_item_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_key *key)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_dir_item_key(eb, item, &disk_key);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+/* struct btrfs_header */
+BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
+ generation, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
+BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
+ 32);
+BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
+ generation, 64);
+
+static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ return (btrfs_header_flags(eb) & flag) == flag;
+}
+
+static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ u64 flags = btrfs_header_flags(eb);
+ btrfs_set_header_flags(eb, flags | flag);
+ return (flags & flag) == flag;
+}
+
+static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ u64 flags = btrfs_header_flags(eb);
+ btrfs_set_header_flags(eb, flags & ~flag);
+ return (flags & flag) == flag;
+}
+
+static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
+{
+ u64 flags = btrfs_header_flags(eb);
+ return flags >> BTRFS_BACKREF_REV_SHIFT;
+}
+
+static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
+ int rev)
+{
+ u64 flags = btrfs_header_flags(eb);
+ flags &= ~BTRFS_BACKREF_REV_MASK;
+ flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
+ btrfs_set_header_flags(eb, flags);
+}
+
+static inline unsigned long btrfs_header_fsid(void)
+{
+ return offsetof(struct btrfs_header, fsid);
+}
+
+static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
+{
+ return offsetof(struct btrfs_header, chunk_tree_uuid);
+}
+
+static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
+{
+ unsigned long ptr = offsetof(struct btrfs_header, csum);
+ return (u8 *)ptr;
+}
+
+static inline int btrfs_is_leaf(struct extent_buffer *eb)
+{
+ return (btrfs_header_level(eb) == 0);
+}
+
+/* struct btrfs_root_item */
+BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
+BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
+BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
+ last_snapshot, 64);
+BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
+ generation_v2, 64);
+BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
+ ctransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
+ otransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
+ stransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
+ rtransid, 64);
+
+static inline struct btrfs_timespec* btrfs_root_ctime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, ctime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_otime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, otime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_stime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, stime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_rtime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, rtime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+/* struct btrfs_root_backup */
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
+ tree_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
+ tree_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
+ tree_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
+ chunk_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
+ chunk_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
+ chunk_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
+ extent_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
+ extent_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
+ extent_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
+ fs_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
+ fs_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
+ fs_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
+ dev_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
+ dev_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
+ dev_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
+ csum_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
+ csum_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
+ csum_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
+ num_devices, 64);
/* struct btrfs_super_block */
@@ -244,4 +914,298 @@ BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
uuid_tree_generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
+{
+ return offsetof(struct btrfs_leaf, items);
+}
+
+/* struct btrfs_file_extent_item */
+BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
+
+static inline unsigned long btrfs_file_extent_inline_start(struct
+ btrfs_file_extent_item *e)
+{
+ unsigned long offset = (unsigned long)e;
+ offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return offset;
+}
+
+static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
+{
+ return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
+}
+
+BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
+ disk_bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
+ disk_bytenr, 64);
+BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
+ disk_num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
+ offset, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
+ offset, 64);
+BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
+ num_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
+ num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
+ ram_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
+ ram_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
+ compression, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
+ compression, 8);
+BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
+ encryption, 8);
+BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
+ other_encoding, 16);
+
+/* btrfs_qgroup_status_item */
+BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
+ version, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
+ flags, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
+ rescan, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
+ struct btrfs_qgroup_status_item, version, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
+ struct btrfs_qgroup_status_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
+ struct btrfs_qgroup_status_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
+ struct btrfs_qgroup_status_item, rescan, 64);
+
+/* btrfs_qgroup_info_item */
+BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
+ rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
+ struct btrfs_qgroup_info_item, rfer_cmpr, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
+ excl, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
+ struct btrfs_qgroup_info_item, excl_cmpr, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
+ struct btrfs_qgroup_info_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
+ struct btrfs_qgroup_info_item, rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
+ struct btrfs_qgroup_info_item, rfer_cmpr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
+ struct btrfs_qgroup_info_item, excl, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
+ struct btrfs_qgroup_info_item, excl_cmpr, 64);
+
+/* btrfs_qgroup_limit_item */
+BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
+ flags, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
+ max_rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
+ max_excl, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
+ rsv_rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
+ rsv_excl, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
+ struct btrfs_qgroup_limit_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
+ struct btrfs_qgroup_limit_item, max_rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
+ struct btrfs_qgroup_limit_item, max_excl, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
+ struct btrfs_qgroup_limit_item, rsv_rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
+ struct btrfs_qgroup_limit_item, rsv_excl, 64);
+
+/* btrfs_balance_item */
+BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->data;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->meta;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->sys;
+}
+
+static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
+ const struct btrfs_dev_stats_item *ptr,
+ int index)
+{
+ u64 val;
+
+ read_extent_buffer(eb, &val,
+ offsetof(struct btrfs_dev_stats_item, values) +
+ ((unsigned long)ptr) + (index * sizeof(u64)),
+ sizeof(val));
+ return val;
+}
+
+/*
+ * this returns the number of bytes used by the item on disk, minus the
+ * size of any extent headers. If a file is compressed on disk, this is
+ * the compressed size
+ */
+static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
+ struct btrfs_item *e)
+{
+ unsigned long offset;
+ offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return btrfs_item_size(eb, e) - offset;
+}
+
+#define btrfs_fs_incompat(fs_info, opt) \
+ __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
+
+static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
+{
+ struct btrfs_super_block *disk_super;
+ disk_super = fs_info->super_copy;
+ return !!(btrfs_super_incompat_flags(disk_super) & flag);
+}
+
+#define btrfs_fs_compat_ro(fs_info, opt) \
+ __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
+
+static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
+{
+ struct btrfs_super_block *disk_super;
+ disk_super = fs_info->super_copy;
+ return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
+}
+
+/* helper function to cast into the data area of the leaf. */
+#define btrfs_item_ptr(leaf, slot, type) \
+ ((type *)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+#define btrfs_item_ptr_offset(leaf, slot) \
+ ((unsigned long)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+ return (u64)crc32c((u32)~1, (u8 *)name, len);
+}
+
+/*
+ * Figure the key offset of an extended inode ref
+ */
+static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
+ int len)
+{
+ return crc32(parent_objectid, (u8 *)name, len);
+}
+
+union btrfs_tree_node {
+ struct btrfs_header header;
+ struct btrfs_leaf leaf;
+ struct btrfs_node node;
+};
+
+struct btrfs_path {
+ union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
+ u32 slots[BTRFS_MAX_LEVEL];
+};
+
+struct btrfs_root {
+ u64 objectid;
+ u64 bytenr;
+ u64 root_dirid;
+};
+
+int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
+int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
+int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
+void btrfs_free_path(struct btrfs_path *);
+int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
+ struct btrfs_path *);
+int btrfs_prev_slot(struct btrfs_path *);
+int btrfs_next_slot(struct btrfs_path *);
+
+static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
+ /* At tree read time we have converted the endian for btrfs_disk_key */
+ return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
+}
+
+static inline struct btrfs_key *
+btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
+ u8 type, struct btrfs_path *path)
+{
+ struct btrfs_key key, *res;
+
+ key.objectid = objectid;
+ key.type = type;
+ key.offset = 0;
+
+ if (btrfs_search_tree(root, &key, path))
+ return NULL;
+
+ res = btrfs_path_leaf_key(path);
+ if (btrfs_comp_keys_type(&key, res)) {
+ btrfs_free_path(path);
+ return NULL;
+ }
+
+ return res;
+}
+
+static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+{
+ return p->nodes[0]->leaf.items[p->slots[0]].size;
+}
+
+static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+{
+ return ((u8 *) leaf) + sizeof(struct btrfs_header)
+ + leaf->items[slot].offset;
+}
+
+static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+{
+ return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
+}
+
+#define btrfs_path_item_ptr(p,t) \
+ ((t *) btrfs_path_leaf_data((p)))
+
+u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
+const char *btrfs_super_csum_name(u16 csum_type);
+u16 btrfs_csum_type_size(u16 csum_type);
+size_t btrfs_super_num_csums(void);
+
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 671f1ac55c68..8190abc920ad 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -4,20 +4,11 @@
#include <linux/sizes.h>
#include <fs_internal.h>
-#include "crypto/hash.h"
#include "ctree.h"
#include "disk-io.h"
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
- u32 crc;
-
- crc = crc32c((u32)~1, (unsigned char *)name, len);
-
- return (u64)crc;
-}
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 07/26] fs: btrfs: Cross port structure accessor into ctree.h
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This will include all structure accessor from btrfs-progs/ctree.h, which
is also the same as kernel ctree.h.
All these accessor handles the endian convert at runtime, and since all
of them are defined as static inline functions, even we don't use them
they won't take extra text space.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/compat.h | 14 +
fs/btrfs/ctree.h | 1136 ++++++++++++++++++++++++++++++++++++++++----
fs/btrfs/disk-io.h | 9 -
3 files changed, 1064 insertions(+), 95 deletions(-)
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 376a035cd6db..64e8b8ab3dfb 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -23,6 +23,20 @@
#define cpu_to_le8(v) (v)
#define __le8 u8
+/*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+#define get_unaligned_le8(p) (*((u8 *)(p)))
+#define get_unaligned_8(p) (*((u8 *)(p)))
+#define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
+#define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
+
/*
* Read data from device specified by @desc and @part
*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index c7528d1ac3db..65ec8256d44b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -12,7 +12,10 @@
#include <common.h>
#include <compiler.h>
#include <linux/rbtree.h>
+#include <linux/unaligned/le_byteshift.h>
+#include <u-boot/crc.h>
#include "kernel-shared/btrfs_tree.h"
+#include "crypto/hash.h"
#include "compat.h"
#include "extent-io.h"
@@ -34,6 +37,20 @@
/* four bytes for CRC32 */
#define BTRFS_EMPTY_DIR_SIZE 0
+struct btrfs_mapping_tree {
+ struct cache_tree cache_tree;
+};
+
+static inline unsigned long btrfs_chunk_item_size(int num_stripes)
+{
+ BUG_ON(num_stripes == 0);
+ return sizeof(struct btrfs_chunk) +
+ sizeof(struct btrfs_stripe) * (num_stripes - 1);
+}
+
+#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
+#define BTRFS_LEAF_DATA_SIZE(fs_info) \
+ (__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
@@ -41,6 +58,35 @@
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
+struct btrfs_device;
+struct btrfs_fs_devices;
+struct btrfs_fs_info {
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *new_chunk_tree_uuid;
+ struct btrfs_root *fs_root;
+ struct btrfs_root *tree_root;
+ struct btrfs_root *chunk_root;
+ struct btrfs_root *csum_root;
+
+ struct rb_root fs_root_tree;
+
+ struct extent_io_tree extent_cache;
+
+ /* logical->physical extent mapping */
+ struct btrfs_mapping_tree mapping_tree;
+
+ u64 last_trans_committed;
+
+ struct btrfs_super_block *super_copy;
+
+ struct btrfs_fs_devices *fs_devices;
+
+ /* Cached block sizes */
+ u32 nodesize;
+ u32 sectorsize;
+ u32 stripesize;
+};
+
/*
* File system states
*/
@@ -62,6 +108,35 @@
offsetof(type, member), \
sizeof(((type *)0)->member)))
+#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const struct extent_buffer *eb) \
+{ \
+ const struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ return le##bits##_to_cpu(h->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ u##bits val) \
+{ \
+ struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ h->member = cpu_to_le##bits(val); \
+}
+
+#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(const struct extent_buffer *eb, \
+ const type *s) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ const type *p = (type *) (eb->data + offset); \
+ return get_unaligned_le##bits(&p->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ type *s, u##bits val) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ type *p = (type *) (eb->data + offset); \
+ put_unaligned_le##bits(val, &p->member); \
+}
+
#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(const type *s) \
{ \
@@ -72,126 +147,721 @@ static inline void btrfs_set_##name(type *s, u##bits val) \
s->member = cpu_to_le##bits(val); \
}
-union btrfs_tree_node {
- struct btrfs_header header;
- struct btrfs_leaf leaf;
- struct btrfs_node node;
-};
+BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
+BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
+BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
+BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
+BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
+ start_offset, 64);
+BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
+BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
+BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
+BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
+BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
-struct btrfs_path {
- union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
- u32 slots[BTRFS_MAX_LEVEL];
-};
+BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
+ dev_group, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
+ seek_speed, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
+ bandwidth, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
+ generation, 64);
-struct btrfs_root {
- u64 objectid;
- u64 bytenr;
- u64 root_dirid;
-};
+static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, uuid);
+}
-struct btrfs_mapping_tree {
- struct cache_tree cache_tree;
-};
+static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, fsid);
+}
-struct btrfs_device;
-struct btrfs_fs_info {
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *new_chunk_tree_uuid;
- struct btrfs_root *fs_root;
- struct btrfs_root *tree_root;
- struct btrfs_root *chunk_root;
- struct btrfs_root *csum_root;
+BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
+BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
+BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
+BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
+BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
+BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
+BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
- struct rb_root fs_root_tree;
+static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
+{
+ return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
+}
- struct extent_io_tree extent_cache;
- struct extent_io_tree free_space_cache;
- struct extent_io_tree pinned_extents;
- struct extent_io_tree extent_ins;
- struct extent_io_tree *excluded_extents;
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
+ stripe_len, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
+ num_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
+ sub_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
- struct rb_root block_group_cache_tree;
- /* logical->physical extent mapping */
- struct btrfs_mapping_tree mapping_tree;
+static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
+ int nr)
+{
+ unsigned long offset = (unsigned long)c;
+ offset += offsetof(struct btrfs_chunk, stripe);
+ offset += nr * sizeof(struct btrfs_stripe);
+ return (struct btrfs_stripe *)offset;
+}
- u64 generation;
- u64 last_trans_committed;
+static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
+}
- struct btrfs_super_block *super_copy;
+static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
+}
- u64 super_bytenr;
+static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
+}
- /* Only support one device yet */
- struct btrfs_devvice *dev;
+static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
+}
- /* Cached block sizes */
- u32 nodesize;
- u32 sectorsize;
- u32 stripesize;
-};
+static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
+}
-int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
-int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void btrfs_free_path(struct btrfs_path *);
-int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_path *);
-int btrfs_prev_slot(struct btrfs_path *);
-int btrfs_next_slot(struct btrfs_path *);
+/* struct btrfs_block_group_item */
+BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
-static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
- /* At tree read time we have converted the endian for btrfs_disk_key */
- return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
+BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+
+/* struct btrfs_free_space_info */
+BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
+ extent_count, 32);
+BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
+
+/* struct btrfs_inode_ref */
+BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
+
+/* struct btrfs_inode_extref */
+BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
+ parent_objectid, 64);
+BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
+ name_len, 16);
+BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
+
+/* struct btrfs_inode_item */
+BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
+BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
+BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
+ struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
+ struct btrfs_inode_item, sequence, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_transid,
+ struct btrfs_inode_item, transid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
+ struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
+ struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
+ struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
+ struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
+ struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
+ struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
+ struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
+ struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
+ struct btrfs_inode_item, flags, 64);
+
+static inline struct btrfs_timespec *
+btrfs_inode_atime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, atime);
+ return (struct btrfs_timespec *)ptr;
}
-static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
- u8 type, struct btrfs_path *path)
+static inline struct btrfs_timespec *
+btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
{
- struct btrfs_key key, *res;
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, mtime);
+ return (struct btrfs_timespec *)ptr;
+}
- key.objectid = objectid;
- key.type = type;
- key.offset = 0;
+static inline struct btrfs_timespec *
+btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, ctime);
+ return (struct btrfs_timespec *)ptr;
+}
- if (btrfs_search_tree(root, &key, path))
- return NULL;
+static inline struct btrfs_timespec *
+btrfs_inode_otime(struct btrfs_inode_item *inode_item)
+{
+ unsigned long ptr = (unsigned long)inode_item;
+ ptr += offsetof(struct btrfs_inode_item, otime);
+ return (struct btrfs_timespec *)ptr;
+}
- res = btrfs_path_leaf_key(path);
- if (btrfs_comp_keys_type(&key, res)) {
- btrfs_free_path(path);
- return NULL;
- }
+BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
+BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
+ sec, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
+ nsec, 32);
- return res;
+/* struct btrfs_dev_extent */
+BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
+ chunk_tree, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
+ chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
+ chunk_offset, 64);
+BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_dev_extent_length, struct btrfs_dev_extent,
+ length, 64);
+
+static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
+{
+ unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
+ return (u8 *)((unsigned long)dev + ptr);
}
-static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+
+/* struct btrfs_extent_item */
+BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, refs, 64);
+BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_flags, struct btrfs_extent_item, flags, 64);
+
+BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
+
+BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
+
+static inline void btrfs_tree_block_key(struct extent_buffer *eb,
+ struct btrfs_tree_block_info *item,
+ struct btrfs_disk_key *key)
{
- return p->nodes[0]->leaf.items[p->slots[0]].size;
+ read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}
-static inline void *btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
+ struct btrfs_tree_block_info *item,
+ struct btrfs_disk_key *key)
{
- return ((u8 *) leaf) + sizeof(struct btrfs_header)
- + leaf->items[slot].offset;
+ write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
}
-static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
+ root, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
+ objectid, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
+ offset, 64);
+BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
+ count, 32);
+
+BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
+ count, 32);
+
+BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
+ type, 8);
+BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
+ offset, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_type,
+ struct btrfs_extent_inline_ref, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_inline_ref_offset,
+ struct btrfs_extent_inline_ref, offset, 64);
+
+static inline u32 btrfs_extent_inline_ref_size(int type)
{
- return btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
+ if (type == BTRFS_TREE_BLOCK_REF_KEY ||
+ type == BTRFS_SHARED_BLOCK_REF_KEY)
+ return sizeof(struct btrfs_extent_inline_ref);
+ if (type == BTRFS_SHARED_DATA_REF_KEY)
+ return sizeof(struct btrfs_shared_data_ref) +
+ sizeof(struct btrfs_extent_inline_ref);
+ if (type == BTRFS_EXTENT_DATA_REF_KEY)
+ return sizeof(struct btrfs_extent_data_ref) +
+ offsetof(struct btrfs_extent_inline_ref, offset);
+ BUG();
+ return 0;
}
-#define btrfs_item_ptr(l,s,t) \
- ((t *) btrfs_leaf_data((l),(s)))
+BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
+BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
+ generation, 64);
+BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
+BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
-#define btrfs_path_item_ptr(p,t) \
- ((t *) btrfs_path_leaf_data((p)))
+/* struct btrfs_node */
+BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
+BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
-u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
-const char *btrfs_super_csum_name(u16 csum_type);
-u16 btrfs_csum_type_size(u16 csum_type);
-size_t btrfs_super_num_csums(void);
+static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline unsigned long btrfs_node_key_ptr_offset(int nr)
+{
+ return offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+}
+
+static inline void btrfs_node_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ unsigned long ptr;
+ ptr = btrfs_node_key_ptr_offset(nr);
+ read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
+ struct btrfs_key_ptr, key, disk_key);
+}
+
+static inline void btrfs_set_node_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ unsigned long ptr;
+ ptr = btrfs_node_key_ptr_offset(nr);
+ write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
+ struct btrfs_key_ptr, key, disk_key);
+}
+
+/* struct btrfs_item */
+BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
+BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
+
+static inline unsigned long btrfs_item_nr_offset(int nr)
+{
+ return offsetof(struct btrfs_leaf, items) +
+ sizeof(struct btrfs_item) * nr;
+}
+
+static inline struct btrfs_item *btrfs_item_nr(int nr)
+{
+ return (struct btrfs_item *)btrfs_item_nr_offset(nr);
+}
+
+static inline u32 btrfs_item_end(struct extent_buffer *eb,
+ struct btrfs_item *item)
+{
+ return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
+}
+
+static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_end(eb, btrfs_item_nr(nr));
+}
+
+static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_offset(eb, btrfs_item_nr(nr));
+}
+
+static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_size(eb, btrfs_item_nr(nr));
+}
+
+static inline void btrfs_item_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ struct btrfs_item *item = btrfs_item_nr(nr);
+ read_eb_member(eb, item, struct btrfs_item, key, disk_key);
+}
+
+static inline void btrfs_set_item_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ struct btrfs_item *item = btrfs_item_nr(nr);
+ write_eb_member(eb, item, struct btrfs_item, key, disk_key);
+}
+
+BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
+
+/*
+ * struct btrfs_root_ref
+ */
+BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
+BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
+BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
+
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_dirid, struct btrfs_root_ref, dirid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_sequence, struct btrfs_root_ref, sequence, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_root_ref_name_len, struct btrfs_root_ref, name_len, 16);
+
+/* struct btrfs_dir_item */
+BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
+BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
+BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, data_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, name_len, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, transid, 64);
+
+static inline void btrfs_dir_item_key(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_disk_key *key)
+{
+ read_eb_member(eb, item, struct btrfs_dir_item, location, key);
+}
+
+static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_disk_key *key)
+{
+ write_eb_member(eb, item, struct btrfs_dir_item, location, key);
+}
+
+/* struct btrfs_free_space_header */
+BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
+ num_entries, 64);
+BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
+ num_bitmaps, 64);
+BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
+ generation, 64);
+
+static inline void btrfs_free_space_key(struct extent_buffer *eb,
+ struct btrfs_free_space_header *h,
+ struct btrfs_disk_key *key)
+{
+ read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
+}
+
+static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
+ struct btrfs_free_space_header *h,
+ struct btrfs_disk_key *key)
+{
+ write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
+}
+
+/* struct btrfs_disk_key */
+BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
+ objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
+
+static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
+ struct btrfs_disk_key *disk)
+{
+ cpu->offset = le64_to_cpu(disk->offset);
+ cpu->type = disk->type;
+ cpu->objectid = le64_to_cpu(disk->objectid);
+}
+
+static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
+ const struct btrfs_key *cpu)
+{
+ disk->offset = cpu_to_le64(cpu->offset);
+ disk->type = cpu->type;
+ disk->objectid = cpu_to_le64(cpu->objectid);
+}
+
+static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_node_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_item_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_key *key)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_dir_item_key(eb, item, &disk_key);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+/* struct btrfs_header */
+BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
+ generation, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
+BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, nritems,
+ 32);
+BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
+ generation, 64);
+
+static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ return (btrfs_header_flags(eb) & flag) == flag;
+}
+
+static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ u64 flags = btrfs_header_flags(eb);
+ btrfs_set_header_flags(eb, flags | flag);
+ return (flags & flag) == flag;
+}
+
+static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
+{
+ u64 flags = btrfs_header_flags(eb);
+ btrfs_set_header_flags(eb, flags & ~flag);
+ return (flags & flag) == flag;
+}
+
+static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
+{
+ u64 flags = btrfs_header_flags(eb);
+ return flags >> BTRFS_BACKREF_REV_SHIFT;
+}
+
+static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
+ int rev)
+{
+ u64 flags = btrfs_header_flags(eb);
+ flags &= ~BTRFS_BACKREF_REV_MASK;
+ flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
+ btrfs_set_header_flags(eb, flags);
+}
+
+static inline unsigned long btrfs_header_fsid(void)
+{
+ return offsetof(struct btrfs_header, fsid);
+}
+
+static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
+{
+ return offsetof(struct btrfs_header, chunk_tree_uuid);
+}
+
+static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
+{
+ unsigned long ptr = offsetof(struct btrfs_header, csum);
+ return (u8 *)ptr;
+}
+
+static inline int btrfs_is_leaf(struct extent_buffer *eb)
+{
+ return (btrfs_header_level(eb) == 0);
+}
+
+/* struct btrfs_root_item */
+BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
+BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
+BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
+ last_snapshot, 64);
+BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
+ generation_v2, 64);
+BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
+ ctransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
+ otransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
+ stransid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
+ rtransid, 64);
+
+static inline struct btrfs_timespec* btrfs_root_ctime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, ctime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_otime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, otime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_stime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, stime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+static inline struct btrfs_timespec* btrfs_root_rtime(
+ struct btrfs_root_item *root_item)
+{
+ unsigned long ptr = (unsigned long)root_item;
+ ptr += offsetof(struct btrfs_root_item, rtime);
+ return (struct btrfs_timespec *)ptr;
+}
+
+/* struct btrfs_root_backup */
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
+ tree_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
+ tree_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
+ tree_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
+ chunk_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
+ chunk_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
+ chunk_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
+ extent_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
+ extent_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
+ extent_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
+ fs_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
+ fs_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
+ fs_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
+ dev_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
+ dev_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
+ dev_root_level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
+ csum_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
+ csum_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
+ csum_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
+ num_devices, 64);
/* struct btrfs_super_block */
@@ -244,4 +914,298 @@ BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
uuid_tree_generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
+{
+ return offsetof(struct btrfs_leaf, items);
+}
+
+/* struct btrfs_file_extent_item */
+BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_type, struct btrfs_file_extent_item, type, 8);
+
+static inline unsigned long btrfs_file_extent_inline_start(struct
+ btrfs_file_extent_item *e)
+{
+ unsigned long offset = (unsigned long)e;
+ offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return offset;
+}
+
+static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
+{
+ return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
+}
+
+BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
+ disk_bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, struct btrfs_file_extent_item,
+ disk_bytenr, 64);
+BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, struct btrfs_file_extent_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
+ disk_num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
+ offset, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, struct btrfs_file_extent_item,
+ offset, 64);
+BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
+ num_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, struct btrfs_file_extent_item,
+ num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
+ ram_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_ram_bytes, struct btrfs_file_extent_item,
+ ram_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
+ compression, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, struct btrfs_file_extent_item,
+ compression, 8);
+BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
+ encryption, 8);
+BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
+ other_encoding, 16);
+
+/* btrfs_qgroup_status_item */
+BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
+ version, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
+ flags, 64);
+BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
+ rescan, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_version,
+ struct btrfs_qgroup_status_item, version, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_generation,
+ struct btrfs_qgroup_status_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_flags,
+ struct btrfs_qgroup_status_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_status_rescan,
+ struct btrfs_qgroup_status_item, rescan, 64);
+
+/* btrfs_qgroup_info_item */
+BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_referenced, struct btrfs_qgroup_info_item,
+ rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_referenced_compressed,
+ struct btrfs_qgroup_info_item, rfer_cmpr, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_exclusive, struct btrfs_qgroup_info_item,
+ excl, 64);
+BTRFS_SETGET_FUNCS(qgroup_info_exclusive_compressed,
+ struct btrfs_qgroup_info_item, excl_cmpr, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
+ struct btrfs_qgroup_info_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced,
+ struct btrfs_qgroup_info_item, rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_referenced_compressed,
+ struct btrfs_qgroup_info_item, rfer_cmpr, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive,
+ struct btrfs_qgroup_info_item, excl, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_exclusive_compressed,
+ struct btrfs_qgroup_info_item, excl_cmpr, 64);
+
+/* btrfs_qgroup_limit_item */
+BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
+ flags, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_max_referenced, struct btrfs_qgroup_limit_item,
+ max_rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_max_exclusive, struct btrfs_qgroup_limit_item,
+ max_excl, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_rsv_referenced, struct btrfs_qgroup_limit_item,
+ rsv_rfer, 64);
+BTRFS_SETGET_FUNCS(qgroup_limit_rsv_exclusive, struct btrfs_qgroup_limit_item,
+ rsv_excl, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_flags,
+ struct btrfs_qgroup_limit_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_referenced,
+ struct btrfs_qgroup_limit_item, max_rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_max_exclusive,
+ struct btrfs_qgroup_limit_item, max_excl, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
+ struct btrfs_qgroup_limit_item, rsv_rfer, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
+ struct btrfs_qgroup_limit_item, rsv_excl, 64);
+
+/* btrfs_balance_item */
+BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->data;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->meta;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
+ struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+ unsigned long offset = (unsigned long)bi;
+ struct btrfs_balance_item *p;
+ p = (struct btrfs_balance_item *)(eb->data + offset);
+ return &p->sys;
+}
+
+static inline u64 btrfs_dev_stats_value(const struct extent_buffer *eb,
+ const struct btrfs_dev_stats_item *ptr,
+ int index)
+{
+ u64 val;
+
+ read_extent_buffer(eb, &val,
+ offsetof(struct btrfs_dev_stats_item, values) +
+ ((unsigned long)ptr) + (index * sizeof(u64)),
+ sizeof(val));
+ return val;
+}
+
+/*
+ * this returns the number of bytes used by the item on disk, minus the
+ * size of any extent headers. If a file is compressed on disk, this is
+ * the compressed size
+ */
+static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
+ struct btrfs_item *e)
+{
+ unsigned long offset;
+ offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return btrfs_item_size(eb, e) - offset;
+}
+
+#define btrfs_fs_incompat(fs_info, opt) \
+ __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
+
+static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
+{
+ struct btrfs_super_block *disk_super;
+ disk_super = fs_info->super_copy;
+ return !!(btrfs_super_incompat_flags(disk_super) & flag);
+}
+
+#define btrfs_fs_compat_ro(fs_info, opt) \
+ __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
+
+static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
+{
+ struct btrfs_super_block *disk_super;
+ disk_super = fs_info->super_copy;
+ return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
+}
+
+/* helper function to cast into the data area of the leaf. */
+#define btrfs_item_ptr(leaf, slot, type) \
+ ((type *)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+#define btrfs_item_ptr_offset(leaf, slot) \
+ ((unsigned long)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+ return (u64)crc32c((u32)~1, (u8 *)name, len);
+}
+
+/*
+ * Figure the key offset of an extended inode ref
+ */
+static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
+ int len)
+{
+ return crc32(parent_objectid, (u8 *)name, len);
+}
+
+union btrfs_tree_node {
+ struct btrfs_header header;
+ struct btrfs_leaf leaf;
+ struct btrfs_node node;
+};
+
+struct btrfs_path {
+ union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
+ u32 slots[BTRFS_MAX_LEVEL];
+};
+
+struct btrfs_root {
+ u64 objectid;
+ u64 bytenr;
+ u64 root_dirid;
+};
+
+int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
+int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
+int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
+void btrfs_free_path(struct btrfs_path *);
+int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
+ struct btrfs_path *);
+int btrfs_prev_slot(struct btrfs_path *);
+int btrfs_next_slot(struct btrfs_path *);
+
+static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
+ /* At tree read time we have converted the endian for btrfs_disk_key */
+ return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
+}
+
+static inline struct btrfs_key *
+btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
+ u8 type, struct btrfs_path *path)
+{
+ struct btrfs_key key, *res;
+
+ key.objectid = objectid;
+ key.type = type;
+ key.offset = 0;
+
+ if (btrfs_search_tree(root, &key, path))
+ return NULL;
+
+ res = btrfs_path_leaf_key(path);
+ if (btrfs_comp_keys_type(&key, res)) {
+ btrfs_free_path(path);
+ return NULL;
+ }
+
+ return res;
+}
+
+static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+{
+ return p->nodes[0]->leaf.items[p->slots[0]].size;
+}
+
+static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+{
+ return ((u8 *) leaf) + sizeof(struct btrfs_header)
+ + leaf->items[slot].offset;
+}
+
+static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+{
+ return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
+}
+
+#define btrfs_path_item_ptr(p,t) \
+ ((t *) btrfs_path_leaf_data((p)))
+
+u16 btrfs_super_csum_size(const struct btrfs_super_block *s);
+const char *btrfs_super_csum_name(u16 csum_type);
+u16 btrfs_csum_type_size(u16 csum_type);
+size_t btrfs_super_num_csums(void);
+
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 671f1ac55c68..8190abc920ad 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -4,20 +4,11 @@
#include <linux/sizes.h>
#include <fs_internal.h>
-#include "crypto/hash.h"
#include "ctree.h"
#include "disk-io.h"
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
- u32 crc;
-
- crc = crc32c((u32)~1, (unsigned char *)name, len);
-
- return (u64)crc;
-}
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 08/26] fs: btrfs: Cross port volumes.[ch] from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This patch cross ports volumes.[ch] from btrfs-progs, including:
- btrfs_map_block()
The core mechanism to map btrfs logical address to physical address.
This version includes multi-device support, along with RAID56 support.
- btrfs_scan_one_device()
This is the function to register one btrfs device to the list.
This is the main part of the multi-device btrfs assembling process.
Although we're not going to support multiple devices until U-boot
allows us to scan one device without actually opening it.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/compat.h | 5 +
fs/btrfs/volumes.c | 872 +++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 202 +++++++++++
4 files changed, 1080 insertions(+), 1 deletion(-)
create mode 100644 fs/btrfs/volumes.c
create mode 100644 fs/btrfs/volumes.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 6dac3a7e239b..573bb7514fce 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o extent-io.o
+ common/rbtree-utils.o extent-cache.o extent-io.o volumes.o
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 64e8b8ab3dfb..8840e509f32c 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -67,4 +67,9 @@ static inline void uuid_unparse(const u8 *uuid, char *out)
return uuid_bin_to_str((unsigned char *)uuid, out, 0);
}
+static inline int is_power_of_2(unsigned long n)
+{
+ return (n != 0 && ((n & (n - 1)) == 0));
+}
+
#endif
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
new file mode 100644
index 000000000000..63853cb2a1dd
--- /dev/null
+++ b/fs/btrfs/volumes.c
@@ -0,0 +1,872 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <stdlib.h>
+#include <common.h>
+#include <fs_internal.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "volumes.h"
+
+const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
+ [BTRFS_RAID_RAID10] = {
+ .sub_stripes = 2,
+ .dev_stripes = 1,
+ .devs_max = 0, /* 0 == as many as possible */
+ .devs_min = 4,
+ .tolerated_failures = 1,
+ .devs_increment = 2,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "raid10",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID10,
+ },
+ [BTRFS_RAID_RAID1] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 2,
+ .devs_min = 2,
+ .tolerated_failures = 1,
+ .devs_increment = 2,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "raid1",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1,
+ },
+ [BTRFS_RAID_RAID1C3] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 3,
+ .devs_min = 3,
+ .tolerated_failures = 2,
+ .devs_increment = 3,
+ .ncopies = 3,
+ .raid_name = "raid1c3",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1C3,
+ },
+ [BTRFS_RAID_RAID1C4] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 4,
+ .devs_min = 4,
+ .tolerated_failures = 3,
+ .devs_increment = 4,
+ .ncopies = 4,
+ .raid_name = "raid1c4",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1C4,
+ },
+ [BTRFS_RAID_DUP] = {
+ .sub_stripes = 1,
+ .dev_stripes = 2,
+ .devs_max = 1,
+ .devs_min = 1,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "dup",
+ .bg_flag = BTRFS_BLOCK_GROUP_DUP,
+ },
+ [BTRFS_RAID_RAID0] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 2,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 0,
+ .raid_name = "raid0",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID0,
+ },
+ [BTRFS_RAID_SINGLE] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 1,
+ .devs_min = 1,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 0,
+ .raid_name = "single",
+ .bg_flag = 0,
+ },
+ [BTRFS_RAID_RAID5] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 2,
+ .tolerated_failures = 1,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 1,
+ .raid_name = "raid5",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID5,
+ },
+ [BTRFS_RAID_RAID6] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 3,
+ .tolerated_failures = 2,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 2,
+ .raid_name = "raid6",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID6,
+ },
+};
+
+struct stripe {
+ struct btrfs_device *dev;
+ u64 physical;
+};
+
+static inline int nr_parity_stripes(struct map_lookup *map)
+{
+ if (map->type & BTRFS_BLOCK_GROUP_RAID5)
+ return 1;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ return 2;
+ else
+ return 0;
+}
+
+static inline int nr_data_stripes(struct map_lookup *map)
+{
+ return map->num_stripes - nr_parity_stripes(map);
+}
+
+#define is_parity_stripe(x) ( ((x) == BTRFS_RAID5_P_STRIPE) || ((x) == BTRFS_RAID6_Q_STRIPE) )
+
+static LIST_HEAD(fs_uuids);
+
+/*
+ * Find a device specified by @devid or @uuid in the list of @fs_devices, or
+ * return NULL.
+ *
+ * If devid and uuid are both specified, the match must be exact, otherwise
+ * only devid is used.
+ */
+static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
+ u64 devid, u8 *uuid)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct btrfs_device *dev;
+
+ list_for_each_entry(dev, head, dev_list) {
+ if (dev->devid == devid &&
+ (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
+ return dev;
+ }
+ }
+ return NULL;
+}
+
+static struct btrfs_fs_devices *find_fsid(u8 *fsid, u8 *metadata_uuid)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ list_for_each_entry(fs_devices, &fs_uuids, list) {
+ if (metadata_uuid && (memcmp(fsid, fs_devices->fsid,
+ BTRFS_FSID_SIZE) == 0) &&
+ (memcmp(metadata_uuid, fs_devices->metadata_uuid,
+ BTRFS_FSID_SIZE) == 0)) {
+ return fs_devices;
+ } else if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0){
+ return fs_devices;
+ }
+ }
+ return NULL;
+}
+
+static int device_list_add(struct btrfs_super_block *disk_super,
+ u64 devid, struct blk_desc *desc,
+ disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices;
+ u64 found_transid = btrfs_super_generation(disk_super);
+ bool metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
+ BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
+
+ if (metadata_uuid)
+ fs_devices = find_fsid(disk_super->fsid,
+ disk_super->metadata_uuid);
+ else
+ fs_devices = find_fsid(disk_super->fsid, NULL);
+
+ if (!fs_devices) {
+ fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
+ if (!fs_devices)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&fs_devices->devices);
+ list_add(&fs_devices->list, &fs_uuids);
+ memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+ if (metadata_uuid)
+ memcpy(fs_devices->metadata_uuid,
+ disk_super->metadata_uuid, BTRFS_FSID_SIZE);
+ else
+ memcpy(fs_devices->metadata_uuid, fs_devices->fsid,
+ BTRFS_FSID_SIZE);
+
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ fs_devices->lowest_devid = (u64)-1;
+ device = NULL;
+ } else {
+ device = find_device(fs_devices, devid,
+ disk_super->dev_item.uuid);
+ }
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device) {
+ /* we can safely leave the fs_devices entry around */
+ return -ENOMEM;
+ }
+ device->devid = devid;
+ device->desc = desc;
+ device->part = part;
+ device->generation = found_transid;
+ memcpy(device->uuid, disk_super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ device->total_devs = btrfs_super_num_devices(disk_super);
+ device->super_bytes_used = btrfs_super_bytes_used(disk_super);
+ device->total_bytes =
+ btrfs_stack_device_total_bytes(&disk_super->dev_item);
+ device->bytes_used =
+ btrfs_stack_device_bytes_used(&disk_super->dev_item);
+ list_add(&device->dev_list, &fs_devices->devices);
+ device->fs_devices = fs_devices;
+ } else if (!device->desc || !device->part) {
+ /*
+ * The existing device has newer generation, so this one could
+ * be a stale one, don't add it.
+ */
+ if (found_transid < device->generation) {
+ error(
+ "adding devid %llu gen %llu but found an existing device gen %llu",
+ device->devid, found_transid,
+ device->generation);
+ return -EEXIST;
+ } else {
+ device->desc = desc;
+ device->part = part;
+ }
+ }
+
+
+ if (found_transid > fs_devices->latest_trans) {
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ }
+ if (fs_devices->lowest_devid > devid) {
+ fs_devices->lowest_devid = devid;
+ }
+ *fs_devices_ret = fs_devices;
+ return 0;
+}
+
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct btrfs_fs_devices *seed_devices;
+ struct btrfs_device *device;
+ int ret = 0;
+
+again:
+ if (!fs_devices)
+ return 0;
+ while (!list_empty(&fs_devices->devices)) {
+ device = list_entry(fs_devices->devices.next,
+ struct btrfs_device, dev_list);
+ list_del(&device->dev_list);
+ /* free the memory */
+ free(device);
+ }
+
+ seed_devices = fs_devices->seed;
+ fs_devices->seed = NULL;
+ if (seed_devices) {
+ struct btrfs_fs_devices *orig;
+
+ orig = fs_devices;
+ fs_devices = seed_devices;
+ list_del(&orig->list);
+ free(orig);
+ goto again;
+ } else {
+ list_del(&fs_devices->list);
+ free(fs_devices);
+ }
+
+ return ret;
+}
+
+void btrfs_close_all_devices(void)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ while (!list_empty(&fs_uuids)) {
+ fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices,
+ list);
+ btrfs_close_devices(fs_devices);
+ }
+}
+
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct btrfs_device *device;
+
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (!device->desc || !device->part) {
+ printf("no device found for devid %llu, skip it \n",
+ device->devid);
+ continue;
+ }
+ }
+ return 0;
+}
+
+int btrfs_scan_one_device(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret,
+ u64 *total_devs)
+{
+ struct btrfs_super_block *disk_super;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+ int ret;
+ u64 devid;
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(desc, part, disk_super);
+ if (ret < 0)
+ return -EIO;
+ devid = btrfs_stack_device_id(&disk_super->dev_item);
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)
+ *total_devs = 1;
+ else
+ *total_devs = btrfs_super_num_devices(disk_super);
+
+ ret = device_list_add(disk_super, devid, desc, part, fs_devices_ret);
+
+ return ret;
+}
+
+struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
+ u8 *uuid, u8 *fsid)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *cur_devices;
+
+ cur_devices = fs_info->fs_devices;
+ while (cur_devices) {
+ if (!fsid ||
+ !memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE)) {
+ device = find_device(cur_devices, devid, uuid);
+ if (device)
+ return device;
+ }
+ cur_devices = cur_devices->seed;
+ }
+ return NULL;
+}
+
+/*
+ * slot == -1: SYSTEM chunk
+ * return -EIO on error, otherwise return 0
+ */
+int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ int slot, u64 logical)
+{
+ u64 length;
+ u64 stripe_len;
+ u16 num_stripes;
+ u16 sub_stripes;
+ u64 type;
+ u32 chunk_ondisk_size;
+ u32 sectorsize = fs_info->sectorsize;
+
+ /*
+ * Basic chunk item size check. Note that btrfs_chunk already contains
+ * one stripe, so no "==" check.
+ */
+ if (slot >= 0 &&
+ btrfs_item_size_nr(leaf, slot) < sizeof(struct btrfs_chunk)) {
+ error("invalid chunk item size, have %u expect [%zu, %lu)",
+ btrfs_item_size_nr(leaf, slot),
+ sizeof(struct btrfs_chunk),
+ BTRFS_LEAF_DATA_SIZE(fs_info));
+ return -EUCLEAN;
+ }
+ length = btrfs_chunk_length(leaf, chunk);
+ stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+ type = btrfs_chunk_type(leaf, chunk);
+
+ if (num_stripes == 0) {
+ error("invalid num_stripes, have %u expect non-zero",
+ num_stripes);
+ return -EUCLEAN;
+ }
+ if (slot >= 0 && btrfs_chunk_item_size(num_stripes) !=
+ btrfs_item_size_nr(leaf, slot)) {
+ error("invalid chunk item size, have %u expect %lu",
+ btrfs_item_size_nr(leaf, slot),
+ btrfs_chunk_item_size(num_stripes));
+ return -EUCLEAN;
+ }
+
+ /*
+ * These valid checks may be insufficient to cover every corner cases.
+ */
+ if (!IS_ALIGNED(logical, sectorsize)) {
+ error("invalid chunk logical %llu", logical);
+ return -EIO;
+ }
+ if (btrfs_chunk_sector_size(leaf, chunk) != sectorsize) {
+ error("invalid chunk sectorsize %llu",
+ (unsigned long long)btrfs_chunk_sector_size(leaf, chunk));
+ return -EIO;
+ }
+ if (!length || !IS_ALIGNED(length, sectorsize)) {
+ error("invalid chunk length %llu", length);
+ return -EIO;
+ }
+ if (stripe_len != BTRFS_STRIPE_LEN) {
+ error("invalid chunk stripe length: %llu", stripe_len);
+ return -EIO;
+ }
+ /* Check on chunk item type */
+ if (slot == -1 && (type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) {
+ error("invalid chunk type %llu", type);
+ return -EIO;
+ }
+ if (type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("unrecognized chunk type: %llu",
+ ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK) & type);
+ return -EIO;
+ }
+ if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+ error("missing chunk type flag: %llu", type);
+ return -EIO;
+ }
+ if (!(is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) ||
+ (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)) {
+ error("conflicting chunk type detected: %llu", type);
+ return -EIO;
+ }
+ if ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
+ !is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("conflicting chunk profile detected: %llu", type);
+ return -EIO;
+ }
+
+ chunk_ondisk_size = btrfs_chunk_item_size(num_stripes);
+ /*
+ * Btrfs_chunk contains at least one stripe, and for sys_chunk
+ * it can't exceed the system chunk array size
+ * For normal chunk, it should match its chunk item size.
+ */
+ if (num_stripes < 1 ||
+ (slot == -1 && chunk_ondisk_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) ||
+ (slot >= 0 && chunk_ondisk_size > btrfs_item_size_nr(leaf, slot))) {
+ error("invalid num_stripes: %u", num_stripes);
+ return -EIO;
+ }
+ /*
+ * Device number check against profile
+ */
+ if ((type & BTRFS_BLOCK_GROUP_RAID10 && (sub_stripes != 2 ||
+ !IS_ALIGNED(num_stripes, sub_stripes))) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1C3 && num_stripes < 3) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1C4 && num_stripes < 4) ||
+ (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||
+ (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) ||
+ (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) ||
+ ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
+ num_stripes != 1)) {
+ error("Invalid num_stripes:sub_stripes %u:%u for profile %llu",
+ num_stripes, sub_stripes,
+ type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * Get stripe length from chunk item and its stripe items
+ *
+ * Caller should only call this function after validating the chunk item
+ * by using btrfs_check_chunk_valid().
+ */
+u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk)
+{
+ u64 stripe_len;
+ u64 chunk_len;
+ u32 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ u64 profile = btrfs_chunk_type(leaf, chunk) &
+ BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ chunk_len = btrfs_chunk_length(leaf, chunk);
+
+ switch (profile) {
+ case 0: /* Single profile */
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID1C3:
+ case BTRFS_BLOCK_GROUP_RAID1C4:
+ case BTRFS_BLOCK_GROUP_DUP:
+ stripe_len = chunk_len;
+ break;
+ case BTRFS_BLOCK_GROUP_RAID0:
+ stripe_len = chunk_len / num_stripes;
+ break;
+ case BTRFS_BLOCK_GROUP_RAID5:
+ stripe_len = chunk_len / (num_stripes - 1);
+ break;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ stripe_len = chunk_len / (num_stripes - 2);
+ break;
+ case BTRFS_BLOCK_GROUP_RAID10:
+ stripe_len = chunk_len / (num_stripes /
+ btrfs_chunk_sub_stripes(leaf, chunk));
+ break;
+ default:
+ /* Invalid chunk profile found */
+ BUG_ON(1);
+ }
+ return stripe_len;
+}
+
+int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ int ret;
+
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+ if (!ce) {
+ fprintf(stderr, "No mapping for %llu-%llu\n",
+ (unsigned long long)logical,
+ (unsigned long long)logical+len);
+ return 1;
+ }
+ if (ce->start > logical || ce->start + ce->size < logical) {
+ fprintf(stderr, "Invalid mapping for %llu-%llu, got "
+ "%llu-%llu\n", (unsigned long long)logical,
+ (unsigned long long)logical+len,
+ (unsigned long long)ce->start,
+ (unsigned long long)ce->start + ce->size);
+ return 1;
+ }
+ map = container_of(ce, struct map_lookup, ce);
+
+ if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4))
+ ret = map->num_stripes;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
+ ret = map->sub_stripes;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID5)
+ ret = 2;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ ret = 3;
+ else
+ ret = 1;
+ return ret;
+}
+
+int btrfs_next_bg(struct btrfs_fs_info *fs_info, u64 *logical,
+ u64 *size, u64 type)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ u64 cur = *logical;
+
+ ce = search_cache_extent(&map_tree->cache_tree, cur);
+
+ while (ce) {
+ /*
+ * only jump to next bg if our cur is not 0
+ * As the initial logical for btrfs_next_bg() is 0, and
+ * if we jump to next bg, we skipped a valid bg.
+ */
+ if (cur) {
+ ce = next_cache_extent(ce);
+ if (!ce)
+ return -ENOENT;
+ }
+
+ cur = ce->start;
+ map = container_of(ce, struct map_lookup, ce);
+ if (map->type & type) {
+ *logical = ce->start;
+ *size = ce->size;
+ return 0;
+ }
+ if (!cur)
+ ce = next_cache_extent(ce);
+ }
+
+ return -ENOENT;
+}
+
+static inline int parity_smaller(u64 a, u64 b)
+{
+ return a > b;
+}
+
+/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
+static void sort_parity_stripes(struct btrfs_multi_bio *bbio, u64 *raid_map)
+{
+ struct btrfs_bio_stripe s;
+ int i;
+ u64 l;
+ int again = 1;
+
+ while (again) {
+ again = 0;
+ for (i = 0; i < bbio->num_stripes - 1; i++) {
+ if (parity_smaller(raid_map[i], raid_map[i+1])) {
+ s = bbio->stripes[i];
+ l = raid_map[i];
+ bbio->stripes[i] = bbio->stripes[i+1];
+ raid_map[i] = raid_map[i+1];
+ bbio->stripes[i+1] = s;
+ raid_map[i+1] = l;
+ again = 1;
+ }
+ }
+ }
+}
+
+int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length, u64 *type,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ u64 offset;
+ u64 stripe_offset;
+ u64 *raid_map = NULL;
+ int stripe_nr;
+ int stripes_allocated = 8;
+ int stripes_required = 1;
+ int stripe_index;
+ int i;
+ struct btrfs_multi_bio *multi = NULL;
+
+ if (multi_ret && rw == READ) {
+ stripes_allocated = 1;
+ }
+again:
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+ if (!ce) {
+ kfree(multi);
+ *length = (u64)-1;
+ return -ENOENT;
+ }
+ if (ce->start > logical) {
+ kfree(multi);
+ *length = ce->start - logical;
+ return -ENOENT;
+ }
+
+ if (multi_ret) {
+ multi = kzalloc(btrfs_multi_bio_size(stripes_allocated),
+ GFP_NOFS);
+ if (!multi)
+ return -ENOMEM;
+ }
+ map = container_of(ce, struct map_lookup, ce);
+ offset = logical - ce->start;
+
+ if (rw == WRITE) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 |
+ BTRFS_BLOCK_GROUP_RAID1C4 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ stripes_required = map->num_stripes;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripes_required = map->sub_stripes;
+ }
+ }
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)
+ && multi_ret && ((rw & WRITE) || mirror_num > 1) && raid_map_ret) {
+ /* RAID[56] write or recovery. Return all stripes */
+ stripes_required = map->num_stripes;
+
+ /* Only allocate the map if we've already got a large enough multi_ret */
+ if (stripes_allocated >= stripes_required) {
+ raid_map = kmalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
+ if (!raid_map) {
+ kfree(multi);
+ return -ENOMEM;
+ }
+ }
+ }
+
+ /* if our multi bio struct is too small, back off and try again */
+ if (multi_ret && stripes_allocated < stripes_required) {
+ stripes_allocated = stripes_required;
+ kfree(multi);
+ multi = NULL;
+ goto again;
+ }
+ stripe_nr = offset;
+ /*
+ * stripe_nr counts the total number of stripes we have to stride
+ * to get to this block
+ */
+ stripe_nr = stripe_nr / map->stripe_len;
+
+ stripe_offset = stripe_nr * map->stripe_len;
+ BUG_ON(offset < stripe_offset);
+
+ /* stripe_offset is the offset of this block in its stripe*/
+ stripe_offset = offset - stripe_offset;
+
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4 |
+ BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ /* we limit the length of each bio to what fits in a stripe */
+ *length = min_t(u64, ce->size - offset,
+ map->stripe_len - stripe_offset);
+ } else {
+ *length = ce->size - offset;
+ }
+
+ if (!multi_ret)
+ goto out;
+
+ multi->num_stripes = 1;
+ stripe_index = 0;
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 |
+ BTRFS_BLOCK_GROUP_RAID1C4)) {
+ if (rw == WRITE)
+ multi->num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+ else
+ stripe_index = stripe_nr % map->num_stripes;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ int factor = map->num_stripes / map->sub_stripes;
+
+ stripe_index = stripe_nr % factor;
+ stripe_index *= map->sub_stripes;
+
+ if (rw == WRITE)
+ multi->num_stripes = map->sub_stripes;
+ else if (mirror_num)
+ stripe_index += mirror_num - 1;
+
+ stripe_nr = stripe_nr / factor;
+ } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
+ if (rw == WRITE)
+ multi->num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+ } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
+ BTRFS_BLOCK_GROUP_RAID6)) {
+
+ if (raid_map) {
+ int rot;
+ u64 tmp;
+ u64 raid56_full_stripe_start;
+ u64 full_stripe_len = nr_data_stripes(map) * map->stripe_len;
+
+ /*
+ * align the start of our data stripe in the logical
+ * address space
+ */
+ raid56_full_stripe_start = offset / full_stripe_len;
+ raid56_full_stripe_start *= full_stripe_len;
+
+ /* get the data stripe number */
+ stripe_nr = raid56_full_stripe_start / map->stripe_len;
+ stripe_nr = stripe_nr / nr_data_stripes(map);
+
+ /* Work out the disk rotation on this stripe-set */
+ rot = stripe_nr % map->num_stripes;
+
+ /* Fill in the logical address of each stripe */
+ tmp = stripe_nr * nr_data_stripes(map);
+
+ for (i = 0; i < nr_data_stripes(map); i++)
+ raid_map[(i+rot) % map->num_stripes] =
+ ce->start + (tmp + i) * map->stripe_len;
+
+ raid_map[(i+rot) % map->num_stripes] = BTRFS_RAID5_P_STRIPE;
+ if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ raid_map[(i+rot+1) % map->num_stripes] = BTRFS_RAID6_Q_STRIPE;
+
+ *length = map->stripe_len;
+ stripe_index = 0;
+ stripe_offset = 0;
+ multi->num_stripes = map->num_stripes;
+ } else {
+ stripe_index = stripe_nr % nr_data_stripes(map);
+ stripe_nr = stripe_nr / nr_data_stripes(map);
+
+ /*
+ * Mirror #0 or #1 means the original data block.
+ * Mirror #2 is RAID5 parity block.
+ * Mirror #3 is RAID6 Q block.
+ */
+ if (mirror_num > 1)
+ stripe_index = nr_data_stripes(map) + mirror_num - 2;
+
+ /* We distribute the parity blocks across stripes */
+ stripe_index = (stripe_nr + stripe_index) % map->num_stripes;
+ }
+ } else {
+ /*
+ * after this do_div call, stripe_nr is the number of stripes
+ * on this device we have to walk to find the data, and
+ * stripe_index is the number of our device in the stripe array
+ */
+ stripe_index = stripe_nr % map->num_stripes;
+ stripe_nr = stripe_nr / map->num_stripes;
+ }
+ BUG_ON(stripe_index >= map->num_stripes);
+
+ for (i = 0; i < multi->num_stripes; i++) {
+ multi->stripes[i].physical =
+ map->stripes[stripe_index].physical + stripe_offset +
+ stripe_nr * map->stripe_len;
+ multi->stripes[i].dev = map->stripes[stripe_index].dev;
+ stripe_index++;
+ }
+ *multi_ret = multi;
+
+ if (type)
+ *type = map->type;
+
+ if (raid_map) {
+ sort_parity_stripes(multi, raid_map);
+ *raid_map_ret = raid_map;
+ }
+out:
+ return 0;
+}
+
+int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret)
+{
+ return __btrfs_map_block(fs_info, rw, logical, length, NULL,
+ multi_ret, mirror_num, raid_map_ret);
+}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
new file mode 100644
index 000000000000..4383b4f9c034
--- /dev/null
+++ b/fs/btrfs/volumes.h
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef __BTRFS_VOLUMES_H__
+#define __BTRFS_VOLUMES_H__
+
+#include <fs_internal.h>
+#include "ctree.h"
+
+#define BTRFS_STRIPE_LEN SZ_64K
+
+struct btrfs_device {
+ struct list_head dev_list;
+ struct btrfs_root *dev_root;
+ struct btrfs_fs_devices *fs_devices;
+
+ struct blk_desc *desc;
+ disk_partition_t *part;
+
+ u64 total_devs;
+ u64 super_bytes_used;
+
+ u64 generation;
+
+ /* the internal btrfs device id */
+ u64 devid;
+
+ /* size of the device */
+ u64 total_bytes;
+
+ /* bytes used */
+ u64 bytes_used;
+
+ /* optimal io alignment for this device */
+ u32 io_align;
+
+ /* optimal io width for this device */
+ u32 io_width;
+
+ /* minimal io size for this device */
+ u32 sector_size;
+
+ /* type and info about this device */
+ u64 type;
+
+ /* physical drive uuid (or lvm uuid) */
+ u8 uuid[BTRFS_UUID_SIZE];
+};
+
+struct btrfs_fs_devices {
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+ u8 metadata_uuid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+
+ u64 latest_devid;
+ u64 lowest_devid;
+ u64 latest_trans;
+
+ u64 total_rw_bytes;
+
+ struct list_head devices;
+ struct list_head list;
+
+ int seeding;
+ struct btrfs_fs_devices *seed;
+};
+
+struct btrfs_bio_stripe {
+ struct btrfs_device *dev;
+ u64 physical;
+};
+
+struct btrfs_multi_bio {
+ int error;
+ int num_stripes;
+ struct btrfs_bio_stripe stripes[];
+};
+
+struct map_lookup {
+ struct cache_extent ce;
+ u64 type;
+ int io_align;
+ int io_width;
+ int stripe_len;
+ int sector_size;
+ int num_stripes;
+ int sub_stripes;
+ struct btrfs_bio_stripe stripes[];
+};
+
+struct btrfs_raid_attr {
+ int sub_stripes; /* sub_stripes info for map */
+ int dev_stripes; /* stripes per dev */
+ int devs_max; /* max devs to use */
+ int devs_min; /* min devs needed */
+ int tolerated_failures; /* max tolerated fail devs */
+ int devs_increment; /* ndevs has to be a multiple of this */
+ int ncopies; /* how many copies to data has */
+ int nparity; /* number of stripes worth of bytes to store
+ * parity information */
+ const char raid_name[8]; /* name of the raid */
+ u64 bg_flag; /* block group flag of the raid */
+};
+
+extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
+
+static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
+{
+ if (flags & BTRFS_BLOCK_GROUP_RAID10)
+ return BTRFS_RAID_RAID10;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1)
+ return BTRFS_RAID_RAID1;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
+ return BTRFS_RAID_RAID1C3;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
+ return BTRFS_RAID_RAID1C4;
+ else if (flags & BTRFS_BLOCK_GROUP_DUP)
+ return BTRFS_RAID_DUP;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID0)
+ return BTRFS_RAID_RAID0;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID5)
+ return BTRFS_RAID_RAID5;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID6)
+ return BTRFS_RAID_RAID6;
+
+ return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
+}
+
+#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
+ (sizeof(struct btrfs_bio_stripe) * (n)))
+#define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
+ (sizeof(struct btrfs_bio_stripe) * (n)))
+
+#define BTRFS_RAID5_P_STRIPE ((u64)-2)
+#define BTRFS_RAID6_Q_STRIPE ((u64)-1)
+
+static inline u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
+{
+ u64 stripe_size;
+
+ if (type & BTRFS_BLOCK_GROUP_RAID0) {
+ stripe_size = length;
+ stripe_size /= num_stripes;
+ } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripe_size = length * 2;
+ stripe_size /= num_stripes;
+ } else if (type & BTRFS_BLOCK_GROUP_RAID5) {
+ stripe_size = length;
+ stripe_size /= (num_stripes - 1);
+ } else if (type & BTRFS_BLOCK_GROUP_RAID6) {
+ stripe_size = length;
+ stripe_size /= (num_stripes - 2);
+ } else {
+ stripe_size = length;
+ }
+ return stripe_size;
+}
+
+#ifndef READ
+#define READ 0
+#define WRITE 1
+#define READA 2
+#endif
+
+int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length, u64 *type,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map);
+int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret);
+int btrfs_next_bg(struct btrfs_fs_info *map_tree, u64 *logical,
+ u64 *size, u64 type);
+static inline int btrfs_next_bg_metadata(struct btrfs_fs_info *fs_info,
+ u64 *logical, u64 *size)
+{
+ return btrfs_next_bg(fs_info, logical, size,
+ BTRFS_BLOCK_GROUP_METADATA);
+}
+static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
+ u64 *logical, u64 *size)
+{
+ return btrfs_next_bg(fs_info, logical, size,
+ BTRFS_BLOCK_GROUP_SYSTEM);
+}
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices);
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
+void btrfs_close_all_devices(void);
+int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
+int btrfs_scan_one_device(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret,
+ u64 *total_devs);
+struct list_head *btrfs_scanned_uuids(void);
+struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
+ u8 *uuid, u8 *fsid);
+int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ int slot, u64 logical);
+u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk);
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 08/26] fs: btrfs: Cross port volumes.[ch] from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This patch cross ports volumes.[ch] from btrfs-progs, including:
- btrfs_map_block()
The core mechanism to map btrfs logical address to physical address.
This version includes multi-device support, along with RAID56 support.
- btrfs_scan_one_device()
This is the function to register one btrfs device to the list.
This is the main part of the multi-device btrfs assembling process.
Although we're not going to support multiple devices until U-boot
allows us to scan one device without actually opening it.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/compat.h | 5 +
fs/btrfs/volumes.c | 872 +++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 202 +++++++++++
4 files changed, 1080 insertions(+), 1 deletion(-)
create mode 100644 fs/btrfs/volumes.c
create mode 100644 fs/btrfs/volumes.h
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 6dac3a7e239b..573bb7514fce 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o extent-io.o
+ common/rbtree-utils.o extent-cache.o extent-io.o volumes.o
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 64e8b8ab3dfb..8840e509f32c 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -67,4 +67,9 @@ static inline void uuid_unparse(const u8 *uuid, char *out)
return uuid_bin_to_str((unsigned char *)uuid, out, 0);
}
+static inline int is_power_of_2(unsigned long n)
+{
+ return (n != 0 && ((n & (n - 1)) == 0));
+}
+
#endif
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
new file mode 100644
index 000000000000..63853cb2a1dd
--- /dev/null
+++ b/fs/btrfs/volumes.c
@@ -0,0 +1,872 @@
+// SPDX-License-Identifier: GPL-2.0+
+#include <stdlib.h>
+#include <common.h>
+#include <fs_internal.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "volumes.h"
+
+const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
+ [BTRFS_RAID_RAID10] = {
+ .sub_stripes = 2,
+ .dev_stripes = 1,
+ .devs_max = 0, /* 0 == as many as possible */
+ .devs_min = 4,
+ .tolerated_failures = 1,
+ .devs_increment = 2,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "raid10",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID10,
+ },
+ [BTRFS_RAID_RAID1] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 2,
+ .devs_min = 2,
+ .tolerated_failures = 1,
+ .devs_increment = 2,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "raid1",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1,
+ },
+ [BTRFS_RAID_RAID1C3] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 3,
+ .devs_min = 3,
+ .tolerated_failures = 2,
+ .devs_increment = 3,
+ .ncopies = 3,
+ .raid_name = "raid1c3",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1C3,
+ },
+ [BTRFS_RAID_RAID1C4] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 4,
+ .devs_min = 4,
+ .tolerated_failures = 3,
+ .devs_increment = 4,
+ .ncopies = 4,
+ .raid_name = "raid1c4",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID1C4,
+ },
+ [BTRFS_RAID_DUP] = {
+ .sub_stripes = 1,
+ .dev_stripes = 2,
+ .devs_max = 1,
+ .devs_min = 1,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 2,
+ .nparity = 0,
+ .raid_name = "dup",
+ .bg_flag = BTRFS_BLOCK_GROUP_DUP,
+ },
+ [BTRFS_RAID_RAID0] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 2,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 0,
+ .raid_name = "raid0",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID0,
+ },
+ [BTRFS_RAID_SINGLE] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 1,
+ .devs_min = 1,
+ .tolerated_failures = 0,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 0,
+ .raid_name = "single",
+ .bg_flag = 0,
+ },
+ [BTRFS_RAID_RAID5] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 2,
+ .tolerated_failures = 1,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 1,
+ .raid_name = "raid5",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID5,
+ },
+ [BTRFS_RAID_RAID6] = {
+ .sub_stripes = 1,
+ .dev_stripes = 1,
+ .devs_max = 0,
+ .devs_min = 3,
+ .tolerated_failures = 2,
+ .devs_increment = 1,
+ .ncopies = 1,
+ .nparity = 2,
+ .raid_name = "raid6",
+ .bg_flag = BTRFS_BLOCK_GROUP_RAID6,
+ },
+};
+
+struct stripe {
+ struct btrfs_device *dev;
+ u64 physical;
+};
+
+static inline int nr_parity_stripes(struct map_lookup *map)
+{
+ if (map->type & BTRFS_BLOCK_GROUP_RAID5)
+ return 1;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ return 2;
+ else
+ return 0;
+}
+
+static inline int nr_data_stripes(struct map_lookup *map)
+{
+ return map->num_stripes - nr_parity_stripes(map);
+}
+
+#define is_parity_stripe(x) ( ((x) == BTRFS_RAID5_P_STRIPE) || ((x) == BTRFS_RAID6_Q_STRIPE) )
+
+static LIST_HEAD(fs_uuids);
+
+/*
+ * Find a device specified by @devid or @uuid in the list of @fs_devices, or
+ * return NULL.
+ *
+ * If devid and uuid are both specified, the match must be exact, otherwise
+ * only devid is used.
+ */
+static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
+ u64 devid, u8 *uuid)
+{
+ struct list_head *head = &fs_devices->devices;
+ struct btrfs_device *dev;
+
+ list_for_each_entry(dev, head, dev_list) {
+ if (dev->devid == devid &&
+ (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
+ return dev;
+ }
+ }
+ return NULL;
+}
+
+static struct btrfs_fs_devices *find_fsid(u8 *fsid, u8 *metadata_uuid)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ list_for_each_entry(fs_devices, &fs_uuids, list) {
+ if (metadata_uuid && (memcmp(fsid, fs_devices->fsid,
+ BTRFS_FSID_SIZE) == 0) &&
+ (memcmp(metadata_uuid, fs_devices->metadata_uuid,
+ BTRFS_FSID_SIZE) == 0)) {
+ return fs_devices;
+ } else if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0){
+ return fs_devices;
+ }
+ }
+ return NULL;
+}
+
+static int device_list_add(struct btrfs_super_block *disk_super,
+ u64 devid, struct blk_desc *desc,
+ disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *fs_devices;
+ u64 found_transid = btrfs_super_generation(disk_super);
+ bool metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
+ BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
+
+ if (metadata_uuid)
+ fs_devices = find_fsid(disk_super->fsid,
+ disk_super->metadata_uuid);
+ else
+ fs_devices = find_fsid(disk_super->fsid, NULL);
+
+ if (!fs_devices) {
+ fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
+ if (!fs_devices)
+ return -ENOMEM;
+ INIT_LIST_HEAD(&fs_devices->devices);
+ list_add(&fs_devices->list, &fs_uuids);
+ memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+ if (metadata_uuid)
+ memcpy(fs_devices->metadata_uuid,
+ disk_super->metadata_uuid, BTRFS_FSID_SIZE);
+ else
+ memcpy(fs_devices->metadata_uuid, fs_devices->fsid,
+ BTRFS_FSID_SIZE);
+
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ fs_devices->lowest_devid = (u64)-1;
+ device = NULL;
+ } else {
+ device = find_device(fs_devices, devid,
+ disk_super->dev_item.uuid);
+ }
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device) {
+ /* we can safely leave the fs_devices entry around */
+ return -ENOMEM;
+ }
+ device->devid = devid;
+ device->desc = desc;
+ device->part = part;
+ device->generation = found_transid;
+ memcpy(device->uuid, disk_super->dev_item.uuid,
+ BTRFS_UUID_SIZE);
+ device->total_devs = btrfs_super_num_devices(disk_super);
+ device->super_bytes_used = btrfs_super_bytes_used(disk_super);
+ device->total_bytes =
+ btrfs_stack_device_total_bytes(&disk_super->dev_item);
+ device->bytes_used =
+ btrfs_stack_device_bytes_used(&disk_super->dev_item);
+ list_add(&device->dev_list, &fs_devices->devices);
+ device->fs_devices = fs_devices;
+ } else if (!device->desc || !device->part) {
+ /*
+ * The existing device has newer generation, so this one could
+ * be a stale one, don't add it.
+ */
+ if (found_transid < device->generation) {
+ error(
+ "adding devid %llu gen %llu but found an existing device gen %llu",
+ device->devid, found_transid,
+ device->generation);
+ return -EEXIST;
+ } else {
+ device->desc = desc;
+ device->part = part;
+ }
+ }
+
+
+ if (found_transid > fs_devices->latest_trans) {
+ fs_devices->latest_devid = devid;
+ fs_devices->latest_trans = found_transid;
+ }
+ if (fs_devices->lowest_devid > devid) {
+ fs_devices->lowest_devid = devid;
+ }
+ *fs_devices_ret = fs_devices;
+ return 0;
+}
+
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct btrfs_fs_devices *seed_devices;
+ struct btrfs_device *device;
+ int ret = 0;
+
+again:
+ if (!fs_devices)
+ return 0;
+ while (!list_empty(&fs_devices->devices)) {
+ device = list_entry(fs_devices->devices.next,
+ struct btrfs_device, dev_list);
+ list_del(&device->dev_list);
+ /* free the memory */
+ free(device);
+ }
+
+ seed_devices = fs_devices->seed;
+ fs_devices->seed = NULL;
+ if (seed_devices) {
+ struct btrfs_fs_devices *orig;
+
+ orig = fs_devices;
+ fs_devices = seed_devices;
+ list_del(&orig->list);
+ free(orig);
+ goto again;
+ } else {
+ list_del(&fs_devices->list);
+ free(fs_devices);
+ }
+
+ return ret;
+}
+
+void btrfs_close_all_devices(void)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ while (!list_empty(&fs_uuids)) {
+ fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices,
+ list);
+ btrfs_close_devices(fs_devices);
+ }
+}
+
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices)
+{
+ struct btrfs_device *device;
+
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ if (!device->desc || !device->part) {
+ printf("no device found for devid %llu, skip it \n",
+ device->devid);
+ continue;
+ }
+ }
+ return 0;
+}
+
+int btrfs_scan_one_device(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret,
+ u64 *total_devs)
+{
+ struct btrfs_super_block *disk_super;
+ char buf[BTRFS_SUPER_INFO_SIZE];
+ int ret;
+ u64 devid;
+
+ disk_super = (struct btrfs_super_block *)buf;
+ ret = btrfs_read_dev_super(desc, part, disk_super);
+ if (ret < 0)
+ return -EIO;
+ devid = btrfs_stack_device_id(&disk_super->dev_item);
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)
+ *total_devs = 1;
+ else
+ *total_devs = btrfs_super_num_devices(disk_super);
+
+ ret = device_list_add(disk_super, devid, desc, part, fs_devices_ret);
+
+ return ret;
+}
+
+struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
+ u8 *uuid, u8 *fsid)
+{
+ struct btrfs_device *device;
+ struct btrfs_fs_devices *cur_devices;
+
+ cur_devices = fs_info->fs_devices;
+ while (cur_devices) {
+ if (!fsid ||
+ !memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE)) {
+ device = find_device(cur_devices, devid, uuid);
+ if (device)
+ return device;
+ }
+ cur_devices = cur_devices->seed;
+ }
+ return NULL;
+}
+
+/*
+ * slot == -1: SYSTEM chunk
+ * return -EIO on error, otherwise return 0
+ */
+int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ int slot, u64 logical)
+{
+ u64 length;
+ u64 stripe_len;
+ u16 num_stripes;
+ u16 sub_stripes;
+ u64 type;
+ u32 chunk_ondisk_size;
+ u32 sectorsize = fs_info->sectorsize;
+
+ /*
+ * Basic chunk item size check. Note that btrfs_chunk already contains
+ * one stripe, so no "==" check.
+ */
+ if (slot >= 0 &&
+ btrfs_item_size_nr(leaf, slot) < sizeof(struct btrfs_chunk)) {
+ error("invalid chunk item size, have %u expect [%zu, %lu)",
+ btrfs_item_size_nr(leaf, slot),
+ sizeof(struct btrfs_chunk),
+ BTRFS_LEAF_DATA_SIZE(fs_info));
+ return -EUCLEAN;
+ }
+ length = btrfs_chunk_length(leaf, chunk);
+ stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+ type = btrfs_chunk_type(leaf, chunk);
+
+ if (num_stripes == 0) {
+ error("invalid num_stripes, have %u expect non-zero",
+ num_stripes);
+ return -EUCLEAN;
+ }
+ if (slot >= 0 && btrfs_chunk_item_size(num_stripes) !=
+ btrfs_item_size_nr(leaf, slot)) {
+ error("invalid chunk item size, have %u expect %lu",
+ btrfs_item_size_nr(leaf, slot),
+ btrfs_chunk_item_size(num_stripes));
+ return -EUCLEAN;
+ }
+
+ /*
+ * These valid checks may be insufficient to cover every corner cases.
+ */
+ if (!IS_ALIGNED(logical, sectorsize)) {
+ error("invalid chunk logical %llu", logical);
+ return -EIO;
+ }
+ if (btrfs_chunk_sector_size(leaf, chunk) != sectorsize) {
+ error("invalid chunk sectorsize %llu",
+ (unsigned long long)btrfs_chunk_sector_size(leaf, chunk));
+ return -EIO;
+ }
+ if (!length || !IS_ALIGNED(length, sectorsize)) {
+ error("invalid chunk length %llu", length);
+ return -EIO;
+ }
+ if (stripe_len != BTRFS_STRIPE_LEN) {
+ error("invalid chunk stripe length: %llu", stripe_len);
+ return -EIO;
+ }
+ /* Check on chunk item type */
+ if (slot == -1 && (type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) {
+ error("invalid chunk type %llu", type);
+ return -EIO;
+ }
+ if (type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("unrecognized chunk type: %llu",
+ ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK) & type);
+ return -EIO;
+ }
+ if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+ error("missing chunk type flag: %llu", type);
+ return -EIO;
+ }
+ if (!(is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) ||
+ (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)) {
+ error("conflicting chunk type detected: %llu", type);
+ return -EIO;
+ }
+ if ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
+ !is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("conflicting chunk profile detected: %llu", type);
+ return -EIO;
+ }
+
+ chunk_ondisk_size = btrfs_chunk_item_size(num_stripes);
+ /*
+ * Btrfs_chunk contains at least one stripe, and for sys_chunk
+ * it can't exceed the system chunk array size
+ * For normal chunk, it should match its chunk item size.
+ */
+ if (num_stripes < 1 ||
+ (slot == -1 && chunk_ondisk_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) ||
+ (slot >= 0 && chunk_ondisk_size > btrfs_item_size_nr(leaf, slot))) {
+ error("invalid num_stripes: %u", num_stripes);
+ return -EIO;
+ }
+ /*
+ * Device number check against profile
+ */
+ if ((type & BTRFS_BLOCK_GROUP_RAID10 && (sub_stripes != 2 ||
+ !IS_ALIGNED(num_stripes, sub_stripes))) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1C3 && num_stripes < 3) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1C4 && num_stripes < 4) ||
+ (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||
+ (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) ||
+ (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) ||
+ ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
+ num_stripes != 1)) {
+ error("Invalid num_stripes:sub_stripes %u:%u for profile %llu",
+ num_stripes, sub_stripes,
+ type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * Get stripe length from chunk item and its stripe items
+ *
+ * Caller should only call this function after validating the chunk item
+ * by using btrfs_check_chunk_valid().
+ */
+u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk)
+{
+ u64 stripe_len;
+ u64 chunk_len;
+ u32 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ u64 profile = btrfs_chunk_type(leaf, chunk) &
+ BTRFS_BLOCK_GROUP_PROFILE_MASK;
+
+ chunk_len = btrfs_chunk_length(leaf, chunk);
+
+ switch (profile) {
+ case 0: /* Single profile */
+ case BTRFS_BLOCK_GROUP_RAID1:
+ case BTRFS_BLOCK_GROUP_RAID1C3:
+ case BTRFS_BLOCK_GROUP_RAID1C4:
+ case BTRFS_BLOCK_GROUP_DUP:
+ stripe_len = chunk_len;
+ break;
+ case BTRFS_BLOCK_GROUP_RAID0:
+ stripe_len = chunk_len / num_stripes;
+ break;
+ case BTRFS_BLOCK_GROUP_RAID5:
+ stripe_len = chunk_len / (num_stripes - 1);
+ break;
+ case BTRFS_BLOCK_GROUP_RAID6:
+ stripe_len = chunk_len / (num_stripes - 2);
+ break;
+ case BTRFS_BLOCK_GROUP_RAID10:
+ stripe_len = chunk_len / (num_stripes /
+ btrfs_chunk_sub_stripes(leaf, chunk));
+ break;
+ default:
+ /* Invalid chunk profile found */
+ BUG_ON(1);
+ }
+ return stripe_len;
+}
+
+int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ int ret;
+
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+ if (!ce) {
+ fprintf(stderr, "No mapping for %llu-%llu\n",
+ (unsigned long long)logical,
+ (unsigned long long)logical+len);
+ return 1;
+ }
+ if (ce->start > logical || ce->start + ce->size < logical) {
+ fprintf(stderr, "Invalid mapping for %llu-%llu, got "
+ "%llu-%llu\n", (unsigned long long)logical,
+ (unsigned long long)logical+len,
+ (unsigned long long)ce->start,
+ (unsigned long long)ce->start + ce->size);
+ return 1;
+ }
+ map = container_of(ce, struct map_lookup, ce);
+
+ if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4))
+ ret = map->num_stripes;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
+ ret = map->sub_stripes;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID5)
+ ret = 2;
+ else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ ret = 3;
+ else
+ ret = 1;
+ return ret;
+}
+
+int btrfs_next_bg(struct btrfs_fs_info *fs_info, u64 *logical,
+ u64 *size, u64 type)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ u64 cur = *logical;
+
+ ce = search_cache_extent(&map_tree->cache_tree, cur);
+
+ while (ce) {
+ /*
+ * only jump to next bg if our cur is not 0
+ * As the initial logical for btrfs_next_bg() is 0, and
+ * if we jump to next bg, we skipped a valid bg.
+ */
+ if (cur) {
+ ce = next_cache_extent(ce);
+ if (!ce)
+ return -ENOENT;
+ }
+
+ cur = ce->start;
+ map = container_of(ce, struct map_lookup, ce);
+ if (map->type & type) {
+ *logical = ce->start;
+ *size = ce->size;
+ return 0;
+ }
+ if (!cur)
+ ce = next_cache_extent(ce);
+ }
+
+ return -ENOENT;
+}
+
+static inline int parity_smaller(u64 a, u64 b)
+{
+ return a > b;
+}
+
+/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
+static void sort_parity_stripes(struct btrfs_multi_bio *bbio, u64 *raid_map)
+{
+ struct btrfs_bio_stripe s;
+ int i;
+ u64 l;
+ int again = 1;
+
+ while (again) {
+ again = 0;
+ for (i = 0; i < bbio->num_stripes - 1; i++) {
+ if (parity_smaller(raid_map[i], raid_map[i+1])) {
+ s = bbio->stripes[i];
+ l = raid_map[i];
+ bbio->stripes[i] = bbio->stripes[i+1];
+ raid_map[i] = raid_map[i+1];
+ bbio->stripes[i+1] = s;
+ raid_map[i+1] = l;
+ again = 1;
+ }
+ }
+ }
+}
+
+int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length, u64 *type,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct cache_extent *ce;
+ struct map_lookup *map;
+ u64 offset;
+ u64 stripe_offset;
+ u64 *raid_map = NULL;
+ int stripe_nr;
+ int stripes_allocated = 8;
+ int stripes_required = 1;
+ int stripe_index;
+ int i;
+ struct btrfs_multi_bio *multi = NULL;
+
+ if (multi_ret && rw == READ) {
+ stripes_allocated = 1;
+ }
+again:
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+ if (!ce) {
+ kfree(multi);
+ *length = (u64)-1;
+ return -ENOENT;
+ }
+ if (ce->start > logical) {
+ kfree(multi);
+ *length = ce->start - logical;
+ return -ENOENT;
+ }
+
+ if (multi_ret) {
+ multi = kzalloc(btrfs_multi_bio_size(stripes_allocated),
+ GFP_NOFS);
+ if (!multi)
+ return -ENOMEM;
+ }
+ map = container_of(ce, struct map_lookup, ce);
+ offset = logical - ce->start;
+
+ if (rw == WRITE) {
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 |
+ BTRFS_BLOCK_GROUP_RAID1C4 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ stripes_required = map->num_stripes;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripes_required = map->sub_stripes;
+ }
+ }
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)
+ && multi_ret && ((rw & WRITE) || mirror_num > 1) && raid_map_ret) {
+ /* RAID[56] write or recovery. Return all stripes */
+ stripes_required = map->num_stripes;
+
+ /* Only allocate the map if we've already got a large enough multi_ret */
+ if (stripes_allocated >= stripes_required) {
+ raid_map = kmalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
+ if (!raid_map) {
+ kfree(multi);
+ return -ENOMEM;
+ }
+ }
+ }
+
+ /* if our multi bio struct is too small, back off and try again */
+ if (multi_ret && stripes_allocated < stripes_required) {
+ stripes_allocated = stripes_required;
+ kfree(multi);
+ multi = NULL;
+ goto again;
+ }
+ stripe_nr = offset;
+ /*
+ * stripe_nr counts the total number of stripes we have to stride
+ * to get to this block
+ */
+ stripe_nr = stripe_nr / map->stripe_len;
+
+ stripe_offset = stripe_nr * map->stripe_len;
+ BUG_ON(offset < stripe_offset);
+
+ /* stripe_offset is the offset of this block in its stripe*/
+ stripe_offset = offset - stripe_offset;
+
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4 |
+ BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ /* we limit the length of each bio to what fits in a stripe */
+ *length = min_t(u64, ce->size - offset,
+ map->stripe_len - stripe_offset);
+ } else {
+ *length = ce->size - offset;
+ }
+
+ if (!multi_ret)
+ goto out;
+
+ multi->num_stripes = 1;
+ stripe_index = 0;
+ if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID1C3 |
+ BTRFS_BLOCK_GROUP_RAID1C4)) {
+ if (rw == WRITE)
+ multi->num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+ else
+ stripe_index = stripe_nr % map->num_stripes;
+ } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
+ int factor = map->num_stripes / map->sub_stripes;
+
+ stripe_index = stripe_nr % factor;
+ stripe_index *= map->sub_stripes;
+
+ if (rw == WRITE)
+ multi->num_stripes = map->sub_stripes;
+ else if (mirror_num)
+ stripe_index += mirror_num - 1;
+
+ stripe_nr = stripe_nr / factor;
+ } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
+ if (rw == WRITE)
+ multi->num_stripes = map->num_stripes;
+ else if (mirror_num)
+ stripe_index = mirror_num - 1;
+ } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
+ BTRFS_BLOCK_GROUP_RAID6)) {
+
+ if (raid_map) {
+ int rot;
+ u64 tmp;
+ u64 raid56_full_stripe_start;
+ u64 full_stripe_len = nr_data_stripes(map) * map->stripe_len;
+
+ /*
+ * align the start of our data stripe in the logical
+ * address space
+ */
+ raid56_full_stripe_start = offset / full_stripe_len;
+ raid56_full_stripe_start *= full_stripe_len;
+
+ /* get the data stripe number */
+ stripe_nr = raid56_full_stripe_start / map->stripe_len;
+ stripe_nr = stripe_nr / nr_data_stripes(map);
+
+ /* Work out the disk rotation on this stripe-set */
+ rot = stripe_nr % map->num_stripes;
+
+ /* Fill in the logical address of each stripe */
+ tmp = stripe_nr * nr_data_stripes(map);
+
+ for (i = 0; i < nr_data_stripes(map); i++)
+ raid_map[(i+rot) % map->num_stripes] =
+ ce->start + (tmp + i) * map->stripe_len;
+
+ raid_map[(i+rot) % map->num_stripes] = BTRFS_RAID5_P_STRIPE;
+ if (map->type & BTRFS_BLOCK_GROUP_RAID6)
+ raid_map[(i+rot+1) % map->num_stripes] = BTRFS_RAID6_Q_STRIPE;
+
+ *length = map->stripe_len;
+ stripe_index = 0;
+ stripe_offset = 0;
+ multi->num_stripes = map->num_stripes;
+ } else {
+ stripe_index = stripe_nr % nr_data_stripes(map);
+ stripe_nr = stripe_nr / nr_data_stripes(map);
+
+ /*
+ * Mirror #0 or #1 means the original data block.
+ * Mirror #2 is RAID5 parity block.
+ * Mirror #3 is RAID6 Q block.
+ */
+ if (mirror_num > 1)
+ stripe_index = nr_data_stripes(map) + mirror_num - 2;
+
+ /* We distribute the parity blocks across stripes */
+ stripe_index = (stripe_nr + stripe_index) % map->num_stripes;
+ }
+ } else {
+ /*
+ * after this do_div call, stripe_nr is the number of stripes
+ * on this device we have to walk to find the data, and
+ * stripe_index is the number of our device in the stripe array
+ */
+ stripe_index = stripe_nr % map->num_stripes;
+ stripe_nr = stripe_nr / map->num_stripes;
+ }
+ BUG_ON(stripe_index >= map->num_stripes);
+
+ for (i = 0; i < multi->num_stripes; i++) {
+ multi->stripes[i].physical =
+ map->stripes[stripe_index].physical + stripe_offset +
+ stripe_nr * map->stripe_len;
+ multi->stripes[i].dev = map->stripes[stripe_index].dev;
+ stripe_index++;
+ }
+ *multi_ret = multi;
+
+ if (type)
+ *type = map->type;
+
+ if (raid_map) {
+ sort_parity_stripes(multi, raid_map);
+ *raid_map_ret = raid_map;
+ }
+out:
+ return 0;
+}
+
+int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret)
+{
+ return __btrfs_map_block(fs_info, rw, logical, length, NULL,
+ multi_ret, mirror_num, raid_map_ret);
+}
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
new file mode 100644
index 000000000000..4383b4f9c034
--- /dev/null
+++ b/fs/btrfs/volumes.h
@@ -0,0 +1,202 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef __BTRFS_VOLUMES_H__
+#define __BTRFS_VOLUMES_H__
+
+#include <fs_internal.h>
+#include "ctree.h"
+
+#define BTRFS_STRIPE_LEN SZ_64K
+
+struct btrfs_device {
+ struct list_head dev_list;
+ struct btrfs_root *dev_root;
+ struct btrfs_fs_devices *fs_devices;
+
+ struct blk_desc *desc;
+ disk_partition_t *part;
+
+ u64 total_devs;
+ u64 super_bytes_used;
+
+ u64 generation;
+
+ /* the internal btrfs device id */
+ u64 devid;
+
+ /* size of the device */
+ u64 total_bytes;
+
+ /* bytes used */
+ u64 bytes_used;
+
+ /* optimal io alignment for this device */
+ u32 io_align;
+
+ /* optimal io width for this device */
+ u32 io_width;
+
+ /* minimal io size for this device */
+ u32 sector_size;
+
+ /* type and info about this device */
+ u64 type;
+
+ /* physical drive uuid (or lvm uuid) */
+ u8 uuid[BTRFS_UUID_SIZE];
+};
+
+struct btrfs_fs_devices {
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+ u8 metadata_uuid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+
+ u64 latest_devid;
+ u64 lowest_devid;
+ u64 latest_trans;
+
+ u64 total_rw_bytes;
+
+ struct list_head devices;
+ struct list_head list;
+
+ int seeding;
+ struct btrfs_fs_devices *seed;
+};
+
+struct btrfs_bio_stripe {
+ struct btrfs_device *dev;
+ u64 physical;
+};
+
+struct btrfs_multi_bio {
+ int error;
+ int num_stripes;
+ struct btrfs_bio_stripe stripes[];
+};
+
+struct map_lookup {
+ struct cache_extent ce;
+ u64 type;
+ int io_align;
+ int io_width;
+ int stripe_len;
+ int sector_size;
+ int num_stripes;
+ int sub_stripes;
+ struct btrfs_bio_stripe stripes[];
+};
+
+struct btrfs_raid_attr {
+ int sub_stripes; /* sub_stripes info for map */
+ int dev_stripes; /* stripes per dev */
+ int devs_max; /* max devs to use */
+ int devs_min; /* min devs needed */
+ int tolerated_failures; /* max tolerated fail devs */
+ int devs_increment; /* ndevs has to be a multiple of this */
+ int ncopies; /* how many copies to data has */
+ int nparity; /* number of stripes worth of bytes to store
+ * parity information */
+ const char raid_name[8]; /* name of the raid */
+ u64 bg_flag; /* block group flag of the raid */
+};
+
+extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
+
+static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
+{
+ if (flags & BTRFS_BLOCK_GROUP_RAID10)
+ return BTRFS_RAID_RAID10;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1)
+ return BTRFS_RAID_RAID1;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
+ return BTRFS_RAID_RAID1C3;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
+ return BTRFS_RAID_RAID1C4;
+ else if (flags & BTRFS_BLOCK_GROUP_DUP)
+ return BTRFS_RAID_DUP;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID0)
+ return BTRFS_RAID_RAID0;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID5)
+ return BTRFS_RAID_RAID5;
+ else if (flags & BTRFS_BLOCK_GROUP_RAID6)
+ return BTRFS_RAID_RAID6;
+
+ return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
+}
+
+#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
+ (sizeof(struct btrfs_bio_stripe) * (n)))
+#define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
+ (sizeof(struct btrfs_bio_stripe) * (n)))
+
+#define BTRFS_RAID5_P_STRIPE ((u64)-2)
+#define BTRFS_RAID6_Q_STRIPE ((u64)-1)
+
+static inline u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
+{
+ u64 stripe_size;
+
+ if (type & BTRFS_BLOCK_GROUP_RAID0) {
+ stripe_size = length;
+ stripe_size /= num_stripes;
+ } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
+ stripe_size = length * 2;
+ stripe_size /= num_stripes;
+ } else if (type & BTRFS_BLOCK_GROUP_RAID5) {
+ stripe_size = length;
+ stripe_size /= (num_stripes - 1);
+ } else if (type & BTRFS_BLOCK_GROUP_RAID6) {
+ stripe_size = length;
+ stripe_size /= (num_stripes - 2);
+ } else {
+ stripe_size = length;
+ }
+ return stripe_size;
+}
+
+#ifndef READ
+#define READ 0
+#define WRITE 1
+#define READA 2
+#endif
+
+int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length, u64 *type,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map);
+int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
+ u64 logical, u64 *length,
+ struct btrfs_multi_bio **multi_ret, int mirror_num,
+ u64 **raid_map_ret);
+int btrfs_next_bg(struct btrfs_fs_info *map_tree, u64 *logical,
+ u64 *size, u64 type);
+static inline int btrfs_next_bg_metadata(struct btrfs_fs_info *fs_info,
+ u64 *logical, u64 *size)
+{
+ return btrfs_next_bg(fs_info, logical, size,
+ BTRFS_BLOCK_GROUP_METADATA);
+}
+static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
+ u64 *logical, u64 *size)
+{
+ return btrfs_next_bg(fs_info, logical, size,
+ BTRFS_BLOCK_GROUP_SYSTEM);
+}
+int btrfs_open_devices(struct btrfs_fs_devices *fs_devices);
+int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
+void btrfs_close_all_devices(void);
+int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
+int btrfs_scan_one_device(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices_ret,
+ u64 *total_devs);
+struct list_head *btrfs_scanned_uuids(void);
+struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
+ u8 *uuid, u8 *fsid);
+int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ int slot, u64 logical);
+u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk);
+#endif
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 09/26] fs: btrfs: Crossport read_tree_block() from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This is the one of the base stone function for btrfs, which will:
- Do the chunk mapping resolve
- Read data from disk
- Do various sanity check
WIth read_tree_block(), we can finally cross port needed btrfs btree
operations to U-boot.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.c | 188 +++++++++++++++++++++++-
fs/btrfs/ctree.h | 50 ++++++-
fs/btrfs/disk-io.c | 348 +++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/disk-io.h | 18 ++-
fs/btrfs/inode.c | 6 +-
5 files changed, 602 insertions(+), 8 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index bdf8e18fd3ee..4e7f213f71ed 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -41,7 +41,7 @@ u16 btrfs_csum_type_size(u16 csum_type)
return btrfs_csums[csum_type].size;
}
-int btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
+int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
return 1;
@@ -81,7 +81,7 @@ static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
mid = (low + high) / 2;
tmp = (struct btrfs_key *) ((u8 *) addr + mid*item_size);
- ret = btrfs_comp_keys(tmp, key);
+ ret = __btrfs_comp_keys(tmp, key);
if (ret < 0) {
low = mid + 1;
@@ -320,3 +320,187 @@ int btrfs_next_slot(struct btrfs_path *p)
p->slots[0]++;
return 0;
}
+
+int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
+{
+ if (k1->objectid > k2->objectid)
+ return 1;
+ if (k1->objectid < k2->objectid)
+ return -1;
+ if (k1->type > k2->type)
+ return 1;
+ if (k1->type < k2->type)
+ return -1;
+ if (k1->offset > k2->offset)
+ return 1;
+ if (k1->offset < k2->offset)
+ return -1;
+ return 0;
+}
+
+static int btrfs_comp_keys(struct btrfs_disk_key *disk,
+ const struct btrfs_key *k2)
+{
+ struct btrfs_key k1;
+
+ btrfs_disk_key_to_cpu(&k1, disk);
+ return btrfs_comp_cpu_keys(&k1, k2);
+}
+
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf)
+{
+ int i;
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(fs_info))
+ goto fail;
+
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ if (parent_key && parent_key->type) {
+ btrfs_node_key(buf, &key, 0);
+ if (memcmp(parent_key, &key, sizeof(key)))
+ goto fail;
+ }
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ for (i = 0; nritems > 1 && i < nritems - 2; i++) {
+ btrfs_node_key(buf, &key, i);
+ btrfs_node_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0)
+ goto fail;
+ }
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ return ret;
+}
+
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf)
+{
+ int i;
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems * sizeof(struct btrfs_item) > buf->len) {
+ fprintf(stderr, "invalid number of items %llu\n",
+ (unsigned long long)buf->start);
+ goto fail;
+ }
+
+ if (btrfs_header_level(buf) != 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_LEVEL;
+ fprintf(stderr, "leaf is not a leaf %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ if (btrfs_leaf_free_space(buf) < 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_FREE_SPACE;
+ fprintf(stderr, "leaf free space incorrect %llu %d\n",
+ (unsigned long long)btrfs_header_bytenr(buf),
+ btrfs_leaf_free_space(buf));
+ goto fail;
+ }
+
+ if (nritems == 0)
+ return BTRFS_TREE_BLOCK_CLEAN;
+
+ btrfs_item_key(buf, &key, 0);
+ if (parent_key && parent_key->type &&
+ memcmp(parent_key, &key, sizeof(key))) {
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ fprintf(stderr, "leaf parent key incorrect %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ for (i = 0; nritems > 1 && i < nritems - 1; i++) {
+ btrfs_item_key(buf, &key, i);
+ btrfs_item_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0) {
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ fprintf(stderr, "bad key ordering %d %d\n", i, i+1);
+ goto fail;
+ }
+ if (btrfs_item_offset_nr(buf, i) !=
+ btrfs_item_end_nr(buf, i + 1)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "incorrect offsets %u %u\n",
+ btrfs_item_offset_nr(buf, i),
+ btrfs_item_end_nr(buf, i + 1));
+ goto fail;
+ }
+ if (i == 0 && btrfs_item_end_nr(buf, i) !=
+ BTRFS_LEAF_DATA_SIZE(fs_info)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "bad item end %u wanted %u\n",
+ btrfs_item_end_nr(buf, i),
+ (unsigned)BTRFS_LEAF_DATA_SIZE(fs_info));
+ goto fail;
+ }
+ }
+
+ for (i = 0; i < nritems; i++) {
+ if (btrfs_item_end_nr(buf, i) >
+ BTRFS_LEAF_DATA_SIZE(fs_info)) {
+ btrfs_item_key(buf, &key, 0);
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "slot end outside of leaf %llu > %llu\n",
+ (unsigned long long)btrfs_item_end_nr(buf, i),
+ (unsigned long long)BTRFS_LEAF_DATA_SIZE(
+ fs_info));
+ goto fail;
+ }
+ }
+
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ return ret;
+}
+
+/*
+ * how many bytes are required to store the items in a leaf. start
+ * and nr indicate which items in the leaf to check. This totals up the
+ * space used both by the item structs and the item data
+ */
+static int leaf_space_used(struct extent_buffer *l, int start, int nr)
+{
+ int data_len;
+ int nritems = btrfs_header_nritems(l);
+ int end = min(nritems, start + nr) - 1;
+
+ if (!nr)
+ return 0;
+ data_len = btrfs_item_end_nr(l, start);
+ data_len = data_len - btrfs_item_offset_nr(l, end);
+ data_len += sizeof(struct btrfs_item) * nr;
+ WARN_ON(data_len < 0);
+ return data_len;
+}
+
+/*
+ * The space between the end of the leaf items and
+ * the start of the leaf data. IOW, how much room
+ * the leaf has left for both items and data
+ */
+int btrfs_leaf_free_space(struct extent_buffer *leaf)
+{
+ int nritems = btrfs_header_nritems(leaf);
+ u32 leaf_data_size;
+ int ret;
+
+ BUG_ON(leaf->fs_info && leaf->fs_info->nodesize != leaf->len);
+ leaf_data_size = __BTRFS_LEAF_DATA_SIZE(leaf->len);
+ ret = leaf_data_size - leaf_space_used(leaf, 0 ,nritems);
+ if (ret < 0) {
+ printk("leaf free space ret %d, leaf data size %u, used %d nritems %d\n",
+ ret, leaf_data_size, leaf_space_used(leaf, 0, nritems),
+ nritems);
+ }
+ return ret;
+}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 65ec8256d44b..52ebce6cded4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -58,6 +58,16 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
+enum btrfs_tree_block_status {
+ BTRFS_TREE_BLOCK_CLEAN,
+ BTRFS_TREE_BLOCK_INVALID_NRITEMS,
+ BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
+ BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
+ BTRFS_TREE_BLOCK_INVALID_LEVEL,
+ BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
+ BTRFS_TREE_BLOCK_INVALID_OFFSETS,
+};
+
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
@@ -87,6 +97,35 @@ struct btrfs_fs_info {
u32 stripesize;
};
+static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
+{
+ BUG_ON(eb->fs_info && eb->fs_info->nodesize != eb->len);
+ return __BTRFS_LEAF_DATA_SIZE(eb->len) / sizeof(struct btrfs_key_ptr);
+}
+
+#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
+ (offsetof(struct btrfs_file_extent_item, disk_bytenr))
+static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) -
+ BTRFS_FILE_EXTENT_INLINE_DATA_START;
+}
+
+static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
+}
+
/*
* File system states
*/
@@ -1148,7 +1187,7 @@ struct btrfs_root {
u64 root_dirid;
};
-int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
+int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void btrfs_free_path(struct btrfs_path *);
@@ -1208,4 +1247,13 @@ const char *btrfs_super_csum_name(u16 csum_type);
u16 btrfs_csum_type_size(u16 csum_type);
size_t btrfs_super_num_csums(void);
+/* ctree.c */
+int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+int btrfs_leaf_free_space(struct extent_buffer *leaf);
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 819068b936ec..9c5021ce2861 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -7,8 +7,113 @@
#include "disk-io.h"
#include "ctree.h"
#include "btrfs.h"
+#include "volumes.h"
+#include "extent-io.h"
#include "crypto/hash.h"
+/* specified errno for check_tree_block */
+#define BTRFS_BAD_BYTENR (-1)
+#define BTRFS_BAD_FSID (-2)
+#define BTRFS_BAD_LEVEL (-3)
+#define BTRFS_BAD_NRITEMS (-4)
+
+/* Calculate max possible nritems for a leaf/node */
+static u32 max_nritems(u8 level, u32 nodesize)
+{
+
+ if (level == 0)
+ return ((nodesize - sizeof(struct btrfs_header)) /
+ sizeof(struct btrfs_item));
+ return ((nodesize - sizeof(struct btrfs_header)) /
+ sizeof(struct btrfs_key_ptr));
+}
+
+static int check_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf)
+{
+
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ u32 nodesize = fs_info->nodesize;
+ bool fsid_match = false;
+ int ret = BTRFS_BAD_FSID;
+
+ if (buf->start != btrfs_header_bytenr(buf))
+ return BTRFS_BAD_BYTENR;
+ if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
+ return BTRFS_BAD_LEVEL;
+ if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
+ nodesize))
+ return BTRFS_BAD_NRITEMS;
+
+ /* Only leaf can be empty */
+ if (btrfs_header_nritems(buf) == 0 &&
+ btrfs_header_level(buf) != 0)
+ return BTRFS_BAD_NRITEMS;
+
+ while (fs_devices) {
+ /*
+ * Checking the incompat flag is only valid for the current
+ * fs. For seed devices it's forbidden to have their uuid
+ * changed so reading ->fsid in this case is fine
+ */
+ if (fs_devices == fs_info->fs_devices &&
+ btrfs_fs_incompat(fs_info, METADATA_UUID))
+ fsid_match = !memcmp_extent_buffer(buf,
+ fs_devices->metadata_uuid,
+ btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+ else
+ fsid_match = !memcmp_extent_buffer(buf,
+ fs_devices->fsid,
+ btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+
+
+ if (fsid_match) {
+ ret = 0;
+ break;
+ }
+ fs_devices = fs_devices->seed;
+ }
+ return ret;
+}
+
+static void print_tree_block_error(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ int err)
+{
+ char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
+ char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
+ u8 buf[BTRFS_UUID_SIZE];
+
+ if (!err)
+ return;
+
+ fprintf(stderr, "bad tree block %llu, ", eb->start);
+ switch (err) {
+ case BTRFS_BAD_FSID:
+ read_extent_buffer(eb, buf, btrfs_header_fsid(),
+ BTRFS_UUID_SIZE);
+ uuid_unparse(buf, found_uuid);
+ uuid_unparse(fs_info->fs_devices->metadata_uuid, fs_uuid);
+ fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
+ fs_uuid, found_uuid);
+ break;
+ case BTRFS_BAD_BYTENR:
+ fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
+ eb->start, btrfs_header_bytenr(eb));
+ break;
+ case BTRFS_BAD_LEVEL:
+ fprintf(stderr, "bad level, %u > %d\n",
+ btrfs_header_level(eb), BTRFS_MAX_LEVEL);
+ break;
+ case BTRFS_BAD_NRITEMS:
+ fprintf(stderr, "invalid nr_items: %u\n",
+ btrfs_header_nritems(eb));
+ break;
+ }
+}
+
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
{
memset(out, 0, BTRFS_CSUM_SIZE);
@@ -233,3 +338,246 @@ int btrfs_read_superblock(void)
return 0;
}
+
+static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
+ int verify, int silent, u16 csum_type)
+{
+ u8 result[BTRFS_CSUM_SIZE];
+ u32 len;
+
+ len = buf->len - BTRFS_CSUM_SIZE;
+ btrfs_csum_data(csum_type, (u8 *)buf->data + BTRFS_CSUM_SIZE,
+ result, len);
+
+ if (verify) {
+ if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
+ /* FIXME: format */
+ if (!silent)
+ printk("checksum verify failed on %llu found %08X wanted %08X\n",
+ (unsigned long long)buf->start,
+ result[0],
+ buf->data[0]);
+ return 1;
+ }
+ } else {
+ write_extent_buffer(buf, result, 0, csum_size);
+ }
+ return 0;
+}
+
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify,
+ u16 csum_type)
+{
+ return __csum_tree_block_size(buf, csum_size, verify, 0, csum_type);
+}
+
+static int csum_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf, int verify)
+{
+ u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
+ u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
+
+ return csum_tree_block_size(buf, csum_size, verify, csum_type);
+}
+
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ return find_extent_buffer(&fs_info->extent_cache,
+ bytenr, blocksize);
+}
+
+struct extent_buffer* btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+ return alloc_extent_buffer(fs_info, bytenr, fs_info->nodesize);
+}
+
+static int verify_parent_transid(struct extent_io_tree *io_tree,
+ struct extent_buffer *eb, u64 parent_transid,
+ int ignore)
+{
+ int ret;
+
+ if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
+ return 0;
+
+ if (extent_buffer_uptodate(eb) &&
+ btrfs_header_generation(eb) == parent_transid) {
+ ret = 0;
+ goto out;
+ }
+ printk("parent transid verify failed on %llu wanted %llu found %llu\n",
+ (unsigned long long)eb->start,
+ (unsigned long long)parent_transid,
+ (unsigned long long)btrfs_header_generation(eb));
+ if (ignore) {
+ eb->flags |= EXTENT_BAD_TRANSID;
+ printk("Ignoring transid failure\n");
+ return 0;
+ }
+
+ ret = 1;
+out:
+ clear_extent_buffer_uptodate(eb);
+ return ret;
+
+}
+
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
+{
+ int ret;
+
+ ret = extent_buffer_uptodate(buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
+ parent_transid, 1);
+ return !ret;
+}
+
+int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
+{
+ return set_extent_buffer_uptodate(eb);
+}
+
+int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
+{
+ unsigned long offset = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ struct btrfs_device *device;
+ int ret = 0;
+ u64 read_len;
+ unsigned long bytes_left = eb->len;
+
+ while (bytes_left) {
+ read_len = bytes_left;
+ device = NULL;
+
+ ret = btrfs_map_block(info, READ, eb->start + offset,
+ &read_len, &multi, mirror, NULL);
+ if (ret) {
+ printk("Couldn't map the block %Lu\n", eb->start + offset);
+ kfree(multi);
+ return -EIO;
+ }
+ device = multi->stripes[0].dev;
+
+ if (!device->desc || !device->part) {
+ kfree(multi);
+ return -EIO;
+ }
+
+ if (read_len > bytes_left)
+ read_len = bytes_left;
+
+ ret = read_extent_from_disk(device->desc, device->part,
+ multi->stripes[0].physical, eb,
+ offset, read_len);
+ kfree(multi);
+ multi = NULL;
+
+ if (ret)
+ return -EIO;
+ offset += read_len;
+ bytes_left -= read_len;
+ }
+ return 0;
+}
+
+struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid)
+{
+ int ret;
+ struct extent_buffer *eb;
+ u64 best_transid = 0;
+ u32 sectorsize = fs_info->sectorsize;
+ int mirror_num = 1;
+ int good_mirror = 0;
+ int candidate_mirror = 0;
+ int num_copies;
+ int ignore = 0;
+
+ /*
+ * Don't even try to create tree block for unaligned tree block
+ * bytenr.
+ * Such unaligned tree block will free overlapping extent buffer,
+ * causing use-after-free bugs for fuzzed images.
+ */
+ if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
+ error("tree block bytenr %llu is not aligned to sectorsize %u",
+ bytenr, sectorsize);
+ return ERR_PTR(-EIO);
+ }
+
+ eb = btrfs_find_create_tree_block(fs_info, bytenr);
+ if (!eb)
+ return ERR_PTR(-ENOMEM);
+
+ if (btrfs_buffer_uptodate(eb, parent_transid))
+ return eb;
+
+ num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
+ while (1) {
+ ret = read_whole_eb(fs_info, eb, mirror_num);
+ if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
+ check_tree_block(fs_info, eb) == 0 &&
+ verify_parent_transid(&fs_info->extent_cache, eb,
+ parent_transid, ignore) == 0) {
+ /*
+ * check_tree_block() is less strict to allow btrfs
+ * check to get raw eb with bad key order and fix it.
+ * But we still need to try to get a good copy if
+ * possible, or bad key order can go into tools like
+ * btrfs ins dump-tree.
+ */
+ if (btrfs_header_level(eb))
+ ret = btrfs_check_node(fs_info, NULL, eb);
+ else
+ ret = btrfs_check_leaf(fs_info, NULL, eb);
+ if (!ret || candidate_mirror == mirror_num) {
+ btrfs_set_buffer_uptodate(eb);
+ return eb;
+ }
+ if (candidate_mirror <= 0)
+ candidate_mirror = mirror_num;
+ }
+ if (ignore) {
+ if (candidate_mirror > 0) {
+ mirror_num = candidate_mirror;
+ continue;
+ }
+ if (check_tree_block(fs_info, eb))
+ print_tree_block_error(fs_info, eb,
+ check_tree_block(fs_info, eb));
+ else
+ fprintf(stderr, "Csum didn't match\n");
+ ret = -EIO;
+ break;
+ }
+ if (num_copies == 1) {
+ ignore = 1;
+ continue;
+ }
+ if (btrfs_header_generation(eb) > best_transid) {
+ best_transid = btrfs_header_generation(eb);
+ good_mirror = mirror_num;
+ }
+ mirror_num++;
+ if (mirror_num > num_copies) {
+ if (candidate_mirror > 0)
+ mirror_num = candidate_mirror;
+ else
+ mirror_num = good_mirror;
+ ignore = 1;
+ continue;
+ }
+ }
+ /*
+ * We failed to read this tree block, it be should deleted right now
+ * to avoid stale cache populate the cache.
+ */
+ free_extent_buffer(eb);
+ return ERR_PTR(ret);
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 8190abc920ad..9d593374c096 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -10,9 +10,23 @@
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+/* U-boot specific */
+int btrfs_read_superblock(void);
+
+/* From btrfs-progs */
+int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
+struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid);
+struct extent_buffer* btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info, u64 bytenr);
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
struct btrfs_super_block *sb);
-int btrfs_read_superblock(void);
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
+int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
+ int verify, u16 csum_type);
#endif
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d88ae67217b1..55f431a28900 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -65,7 +65,7 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
if (btrfs_search_tree(&tmp_root, location, &path))
return res;
- if (btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
+ if (__btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
goto out;
if (item) {
@@ -98,7 +98,7 @@ int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
if (btrfs_search_tree(root, &key, &path))
return -1;
- if (btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
+ if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
goto out;
extent = btrfs_path_item_ptr(&path, struct btrfs_file_extent_item);
@@ -333,7 +333,7 @@ u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
if (btrfs_search_tree(root, &key, &path))
return -1ULL;
- if (btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
+ if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
if (btrfs_prev_slot(&path))
goto out;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 09/26] fs: btrfs: Crossport read_tree_block() from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This is the one of the base stone function for btrfs, which will:
- Do the chunk mapping resolve
- Read data from disk
- Do various sanity check
WIth read_tree_block(), we can finally cross port needed btrfs btree
operations to U-boot.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.c | 188 +++++++++++++++++++++++-
fs/btrfs/ctree.h | 50 ++++++-
fs/btrfs/disk-io.c | 348 +++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/disk-io.h | 18 ++-
fs/btrfs/inode.c | 6 +-
5 files changed, 602 insertions(+), 8 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index bdf8e18fd3ee..4e7f213f71ed 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -41,7 +41,7 @@ u16 btrfs_csum_type_size(u16 csum_type)
return btrfs_csums[csum_type].size;
}
-int btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
+int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
return 1;
@@ -81,7 +81,7 @@ static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
mid = (low + high) / 2;
tmp = (struct btrfs_key *) ((u8 *) addr + mid*item_size);
- ret = btrfs_comp_keys(tmp, key);
+ ret = __btrfs_comp_keys(tmp, key);
if (ret < 0) {
low = mid + 1;
@@ -320,3 +320,187 @@ int btrfs_next_slot(struct btrfs_path *p)
p->slots[0]++;
return 0;
}
+
+int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
+{
+ if (k1->objectid > k2->objectid)
+ return 1;
+ if (k1->objectid < k2->objectid)
+ return -1;
+ if (k1->type > k2->type)
+ return 1;
+ if (k1->type < k2->type)
+ return -1;
+ if (k1->offset > k2->offset)
+ return 1;
+ if (k1->offset < k2->offset)
+ return -1;
+ return 0;
+}
+
+static int btrfs_comp_keys(struct btrfs_disk_key *disk,
+ const struct btrfs_key *k2)
+{
+ struct btrfs_key k1;
+
+ btrfs_disk_key_to_cpu(&k1, disk);
+ return btrfs_comp_cpu_keys(&k1, k2);
+}
+
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf)
+{
+ int i;
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems == 0 || nritems > BTRFS_NODEPTRS_PER_BLOCK(fs_info))
+ goto fail;
+
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ if (parent_key && parent_key->type) {
+ btrfs_node_key(buf, &key, 0);
+ if (memcmp(parent_key, &key, sizeof(key)))
+ goto fail;
+ }
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ for (i = 0; nritems > 1 && i < nritems - 2; i++) {
+ btrfs_node_key(buf, &key, i);
+ btrfs_node_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0)
+ goto fail;
+ }
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ return ret;
+}
+
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf)
+{
+ int i;
+ struct btrfs_key cpukey;
+ struct btrfs_disk_key key;
+ u32 nritems = btrfs_header_nritems(buf);
+ enum btrfs_tree_block_status ret = BTRFS_TREE_BLOCK_INVALID_NRITEMS;
+
+ if (nritems * sizeof(struct btrfs_item) > buf->len) {
+ fprintf(stderr, "invalid number of items %llu\n",
+ (unsigned long long)buf->start);
+ goto fail;
+ }
+
+ if (btrfs_header_level(buf) != 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_LEVEL;
+ fprintf(stderr, "leaf is not a leaf %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ if (btrfs_leaf_free_space(buf) < 0) {
+ ret = BTRFS_TREE_BLOCK_INVALID_FREE_SPACE;
+ fprintf(stderr, "leaf free space incorrect %llu %d\n",
+ (unsigned long long)btrfs_header_bytenr(buf),
+ btrfs_leaf_free_space(buf));
+ goto fail;
+ }
+
+ if (nritems == 0)
+ return BTRFS_TREE_BLOCK_CLEAN;
+
+ btrfs_item_key(buf, &key, 0);
+ if (parent_key && parent_key->type &&
+ memcmp(parent_key, &key, sizeof(key))) {
+ ret = BTRFS_TREE_BLOCK_INVALID_PARENT_KEY;
+ fprintf(stderr, "leaf parent key incorrect %llu\n",
+ (unsigned long long)btrfs_header_bytenr(buf));
+ goto fail;
+ }
+ for (i = 0; nritems > 1 && i < nritems - 1; i++) {
+ btrfs_item_key(buf, &key, i);
+ btrfs_item_key_to_cpu(buf, &cpukey, i + 1);
+ if (btrfs_comp_keys(&key, &cpukey) >= 0) {
+ ret = BTRFS_TREE_BLOCK_BAD_KEY_ORDER;
+ fprintf(stderr, "bad key ordering %d %d\n", i, i+1);
+ goto fail;
+ }
+ if (btrfs_item_offset_nr(buf, i) !=
+ btrfs_item_end_nr(buf, i + 1)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "incorrect offsets %u %u\n",
+ btrfs_item_offset_nr(buf, i),
+ btrfs_item_end_nr(buf, i + 1));
+ goto fail;
+ }
+ if (i == 0 && btrfs_item_end_nr(buf, i) !=
+ BTRFS_LEAF_DATA_SIZE(fs_info)) {
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "bad item end %u wanted %u\n",
+ btrfs_item_end_nr(buf, i),
+ (unsigned)BTRFS_LEAF_DATA_SIZE(fs_info));
+ goto fail;
+ }
+ }
+
+ for (i = 0; i < nritems; i++) {
+ if (btrfs_item_end_nr(buf, i) >
+ BTRFS_LEAF_DATA_SIZE(fs_info)) {
+ btrfs_item_key(buf, &key, 0);
+ ret = BTRFS_TREE_BLOCK_INVALID_OFFSETS;
+ fprintf(stderr, "slot end outside of leaf %llu > %llu\n",
+ (unsigned long long)btrfs_item_end_nr(buf, i),
+ (unsigned long long)BTRFS_LEAF_DATA_SIZE(
+ fs_info));
+ goto fail;
+ }
+ }
+
+ return BTRFS_TREE_BLOCK_CLEAN;
+fail:
+ return ret;
+}
+
+/*
+ * how many bytes are required to store the items in a leaf. start
+ * and nr indicate which items in the leaf to check. This totals up the
+ * space used both by the item structs and the item data
+ */
+static int leaf_space_used(struct extent_buffer *l, int start, int nr)
+{
+ int data_len;
+ int nritems = btrfs_header_nritems(l);
+ int end = min(nritems, start + nr) - 1;
+
+ if (!nr)
+ return 0;
+ data_len = btrfs_item_end_nr(l, start);
+ data_len = data_len - btrfs_item_offset_nr(l, end);
+ data_len += sizeof(struct btrfs_item) * nr;
+ WARN_ON(data_len < 0);
+ return data_len;
+}
+
+/*
+ * The space between the end of the leaf items and
+ * the start of the leaf data. IOW, how much room
+ * the leaf has left for both items and data
+ */
+int btrfs_leaf_free_space(struct extent_buffer *leaf)
+{
+ int nritems = btrfs_header_nritems(leaf);
+ u32 leaf_data_size;
+ int ret;
+
+ BUG_ON(leaf->fs_info && leaf->fs_info->nodesize != leaf->len);
+ leaf_data_size = __BTRFS_LEAF_DATA_SIZE(leaf->len);
+ ret = leaf_data_size - leaf_space_used(leaf, 0 ,nritems);
+ if (ret < 0) {
+ printk("leaf free space ret %d, leaf data size %u, used %d nritems %d\n",
+ ret, leaf_data_size, leaf_space_used(leaf, 0, nritems),
+ nritems);
+ }
+ return ret;
+}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 65ec8256d44b..52ebce6cded4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -58,6 +58,16 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
#define BTRFS_MAX_EXTENT_SIZE SZ_128M
+enum btrfs_tree_block_status {
+ BTRFS_TREE_BLOCK_CLEAN,
+ BTRFS_TREE_BLOCK_INVALID_NRITEMS,
+ BTRFS_TREE_BLOCK_INVALID_PARENT_KEY,
+ BTRFS_TREE_BLOCK_BAD_KEY_ORDER,
+ BTRFS_TREE_BLOCK_INVALID_LEVEL,
+ BTRFS_TREE_BLOCK_INVALID_FREE_SPACE,
+ BTRFS_TREE_BLOCK_INVALID_OFFSETS,
+};
+
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
@@ -87,6 +97,35 @@ struct btrfs_fs_info {
u32 stripesize;
};
+static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
+{
+ return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
+}
+
+static inline u32 BTRFS_NODEPTRS_PER_EXTENT_BUFFER(const struct extent_buffer *eb)
+{
+ BUG_ON(eb->fs_info && eb->fs_info->nodesize != eb->len);
+ return __BTRFS_LEAF_DATA_SIZE(eb->len) / sizeof(struct btrfs_key_ptr);
+}
+
+#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
+ (offsetof(struct btrfs_file_extent_item, disk_bytenr))
+static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) -
+ BTRFS_FILE_EXTENT_INLINE_DATA_START;
+}
+
+static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
+{
+ return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
+}
+
/*
* File system states
*/
@@ -1148,7 +1187,7 @@ struct btrfs_root {
u64 root_dirid;
};
-int btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
+int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void btrfs_free_path(struct btrfs_path *);
@@ -1208,4 +1247,13 @@ const char *btrfs_super_csum_name(u16 csum_type);
u16 btrfs_csum_type_size(u16 csum_type);
size_t btrfs_super_num_csums(void);
+/* ctree.c */
+int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
+enum btrfs_tree_block_status
+btrfs_check_node(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+enum btrfs_tree_block_status
+btrfs_check_leaf(struct btrfs_fs_info *fs_info,
+ struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+int btrfs_leaf_free_space(struct extent_buffer *leaf);
#endif /* __BTRFS_CTREE_H__ */
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 819068b936ec..9c5021ce2861 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -7,8 +7,113 @@
#include "disk-io.h"
#include "ctree.h"
#include "btrfs.h"
+#include "volumes.h"
+#include "extent-io.h"
#include "crypto/hash.h"
+/* specified errno for check_tree_block */
+#define BTRFS_BAD_BYTENR (-1)
+#define BTRFS_BAD_FSID (-2)
+#define BTRFS_BAD_LEVEL (-3)
+#define BTRFS_BAD_NRITEMS (-4)
+
+/* Calculate max possible nritems for a leaf/node */
+static u32 max_nritems(u8 level, u32 nodesize)
+{
+
+ if (level == 0)
+ return ((nodesize - sizeof(struct btrfs_header)) /
+ sizeof(struct btrfs_item));
+ return ((nodesize - sizeof(struct btrfs_header)) /
+ sizeof(struct btrfs_key_ptr));
+}
+
+static int check_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf)
+{
+
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ u32 nodesize = fs_info->nodesize;
+ bool fsid_match = false;
+ int ret = BTRFS_BAD_FSID;
+
+ if (buf->start != btrfs_header_bytenr(buf))
+ return BTRFS_BAD_BYTENR;
+ if (btrfs_header_level(buf) >= BTRFS_MAX_LEVEL)
+ return BTRFS_BAD_LEVEL;
+ if (btrfs_header_nritems(buf) > max_nritems(btrfs_header_level(buf),
+ nodesize))
+ return BTRFS_BAD_NRITEMS;
+
+ /* Only leaf can be empty */
+ if (btrfs_header_nritems(buf) == 0 &&
+ btrfs_header_level(buf) != 0)
+ return BTRFS_BAD_NRITEMS;
+
+ while (fs_devices) {
+ /*
+ * Checking the incompat flag is only valid for the current
+ * fs. For seed devices it's forbidden to have their uuid
+ * changed so reading ->fsid in this case is fine
+ */
+ if (fs_devices == fs_info->fs_devices &&
+ btrfs_fs_incompat(fs_info, METADATA_UUID))
+ fsid_match = !memcmp_extent_buffer(buf,
+ fs_devices->metadata_uuid,
+ btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+ else
+ fsid_match = !memcmp_extent_buffer(buf,
+ fs_devices->fsid,
+ btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+
+
+ if (fsid_match) {
+ ret = 0;
+ break;
+ }
+ fs_devices = fs_devices->seed;
+ }
+ return ret;
+}
+
+static void print_tree_block_error(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ int err)
+{
+ char fs_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
+ char found_uuid[BTRFS_UUID_UNPARSED_SIZE] = {'\0'};
+ u8 buf[BTRFS_UUID_SIZE];
+
+ if (!err)
+ return;
+
+ fprintf(stderr, "bad tree block %llu, ", eb->start);
+ switch (err) {
+ case BTRFS_BAD_FSID:
+ read_extent_buffer(eb, buf, btrfs_header_fsid(),
+ BTRFS_UUID_SIZE);
+ uuid_unparse(buf, found_uuid);
+ uuid_unparse(fs_info->fs_devices->metadata_uuid, fs_uuid);
+ fprintf(stderr, "fsid mismatch, want=%s, have=%s\n",
+ fs_uuid, found_uuid);
+ break;
+ case BTRFS_BAD_BYTENR:
+ fprintf(stderr, "bytenr mismatch, want=%llu, have=%llu\n",
+ eb->start, btrfs_header_bytenr(eb));
+ break;
+ case BTRFS_BAD_LEVEL:
+ fprintf(stderr, "bad level, %u > %d\n",
+ btrfs_header_level(eb), BTRFS_MAX_LEVEL);
+ break;
+ case BTRFS_BAD_NRITEMS:
+ fprintf(stderr, "invalid nr_items: %u\n",
+ btrfs_header_nritems(eb));
+ break;
+ }
+}
+
int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len)
{
memset(out, 0, BTRFS_CSUM_SIZE);
@@ -233,3 +338,246 @@ int btrfs_read_superblock(void)
return 0;
}
+
+static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
+ int verify, int silent, u16 csum_type)
+{
+ u8 result[BTRFS_CSUM_SIZE];
+ u32 len;
+
+ len = buf->len - BTRFS_CSUM_SIZE;
+ btrfs_csum_data(csum_type, (u8 *)buf->data + BTRFS_CSUM_SIZE,
+ result, len);
+
+ if (verify) {
+ if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
+ /* FIXME: format */
+ if (!silent)
+ printk("checksum verify failed on %llu found %08X wanted %08X\n",
+ (unsigned long long)buf->start,
+ result[0],
+ buf->data[0]);
+ return 1;
+ }
+ } else {
+ write_extent_buffer(buf, result, 0, csum_size);
+ }
+ return 0;
+}
+
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size, int verify,
+ u16 csum_type)
+{
+ return __csum_tree_block_size(buf, csum_size, verify, 0, csum_type);
+}
+
+static int csum_tree_block(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *buf, int verify)
+{
+ u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
+ u16 csum_type = btrfs_super_csum_type(fs_info->super_copy);
+
+ return csum_tree_block_size(buf, csum_size, verify, csum_type);
+}
+
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize)
+{
+ return find_extent_buffer(&fs_info->extent_cache,
+ bytenr, blocksize);
+}
+
+struct extent_buffer* btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info, u64 bytenr)
+{
+ return alloc_extent_buffer(fs_info, bytenr, fs_info->nodesize);
+}
+
+static int verify_parent_transid(struct extent_io_tree *io_tree,
+ struct extent_buffer *eb, u64 parent_transid,
+ int ignore)
+{
+ int ret;
+
+ if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
+ return 0;
+
+ if (extent_buffer_uptodate(eb) &&
+ btrfs_header_generation(eb) == parent_transid) {
+ ret = 0;
+ goto out;
+ }
+ printk("parent transid verify failed on %llu wanted %llu found %llu\n",
+ (unsigned long long)eb->start,
+ (unsigned long long)parent_transid,
+ (unsigned long long)btrfs_header_generation(eb));
+ if (ignore) {
+ eb->flags |= EXTENT_BAD_TRANSID;
+ printk("Ignoring transid failure\n");
+ return 0;
+ }
+
+ ret = 1;
+out:
+ clear_extent_buffer_uptodate(eb);
+ return ret;
+
+}
+
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
+{
+ int ret;
+
+ ret = extent_buffer_uptodate(buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
+ parent_transid, 1);
+ return !ret;
+}
+
+int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
+{
+ return set_extent_buffer_uptodate(eb);
+}
+
+int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
+{
+ unsigned long offset = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ struct btrfs_device *device;
+ int ret = 0;
+ u64 read_len;
+ unsigned long bytes_left = eb->len;
+
+ while (bytes_left) {
+ read_len = bytes_left;
+ device = NULL;
+
+ ret = btrfs_map_block(info, READ, eb->start + offset,
+ &read_len, &multi, mirror, NULL);
+ if (ret) {
+ printk("Couldn't map the block %Lu\n", eb->start + offset);
+ kfree(multi);
+ return -EIO;
+ }
+ device = multi->stripes[0].dev;
+
+ if (!device->desc || !device->part) {
+ kfree(multi);
+ return -EIO;
+ }
+
+ if (read_len > bytes_left)
+ read_len = bytes_left;
+
+ ret = read_extent_from_disk(device->desc, device->part,
+ multi->stripes[0].physical, eb,
+ offset, read_len);
+ kfree(multi);
+ multi = NULL;
+
+ if (ret)
+ return -EIO;
+ offset += read_len;
+ bytes_left -= read_len;
+ }
+ return 0;
+}
+
+struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid)
+{
+ int ret;
+ struct extent_buffer *eb;
+ u64 best_transid = 0;
+ u32 sectorsize = fs_info->sectorsize;
+ int mirror_num = 1;
+ int good_mirror = 0;
+ int candidate_mirror = 0;
+ int num_copies;
+ int ignore = 0;
+
+ /*
+ * Don't even try to create tree block for unaligned tree block
+ * bytenr.
+ * Such unaligned tree block will free overlapping extent buffer,
+ * causing use-after-free bugs for fuzzed images.
+ */
+ if (bytenr < sectorsize || !IS_ALIGNED(bytenr, sectorsize)) {
+ error("tree block bytenr %llu is not aligned to sectorsize %u",
+ bytenr, sectorsize);
+ return ERR_PTR(-EIO);
+ }
+
+ eb = btrfs_find_create_tree_block(fs_info, bytenr);
+ if (!eb)
+ return ERR_PTR(-ENOMEM);
+
+ if (btrfs_buffer_uptodate(eb, parent_transid))
+ return eb;
+
+ num_copies = btrfs_num_copies(fs_info, eb->start, eb->len);
+ while (1) {
+ ret = read_whole_eb(fs_info, eb, mirror_num);
+ if (ret == 0 && csum_tree_block(fs_info, eb, 1) == 0 &&
+ check_tree_block(fs_info, eb) == 0 &&
+ verify_parent_transid(&fs_info->extent_cache, eb,
+ parent_transid, ignore) == 0) {
+ /*
+ * check_tree_block() is less strict to allow btrfs
+ * check to get raw eb with bad key order and fix it.
+ * But we still need to try to get a good copy if
+ * possible, or bad key order can go into tools like
+ * btrfs ins dump-tree.
+ */
+ if (btrfs_header_level(eb))
+ ret = btrfs_check_node(fs_info, NULL, eb);
+ else
+ ret = btrfs_check_leaf(fs_info, NULL, eb);
+ if (!ret || candidate_mirror == mirror_num) {
+ btrfs_set_buffer_uptodate(eb);
+ return eb;
+ }
+ if (candidate_mirror <= 0)
+ candidate_mirror = mirror_num;
+ }
+ if (ignore) {
+ if (candidate_mirror > 0) {
+ mirror_num = candidate_mirror;
+ continue;
+ }
+ if (check_tree_block(fs_info, eb))
+ print_tree_block_error(fs_info, eb,
+ check_tree_block(fs_info, eb));
+ else
+ fprintf(stderr, "Csum didn't match\n");
+ ret = -EIO;
+ break;
+ }
+ if (num_copies == 1) {
+ ignore = 1;
+ continue;
+ }
+ if (btrfs_header_generation(eb) > best_transid) {
+ best_transid = btrfs_header_generation(eb);
+ good_mirror = mirror_num;
+ }
+ mirror_num++;
+ if (mirror_num > num_copies) {
+ if (candidate_mirror > 0)
+ mirror_num = candidate_mirror;
+ else
+ mirror_num = good_mirror;
+ ignore = 1;
+ continue;
+ }
+ }
+ /*
+ * We failed to read this tree block, it be should deleted right now
+ * to avoid stale cache populate the cache.
+ */
+ free_extent_buffer(eb);
+ return ERR_PTR(ret);
+}
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 8190abc920ad..9d593374c096 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -10,9 +10,23 @@
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+/* U-boot specific */
+int btrfs_read_superblock(void);
+
+/* From btrfs-progs */
+int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
+struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
+ u64 parent_transid);
+struct extent_buffer* btrfs_find_create_tree_block(
+ struct btrfs_fs_info *fs_info, u64 bytenr);
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
+ u64 bytenr, u32 blocksize);
int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
struct btrfs_super_block *sb);
-int btrfs_read_superblock(void);
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
+int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
+int btrfs_csum_data(u16 csum_type, const u8 *data, u8 *out, size_t len);
+int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
+ int verify, u16 csum_type);
#endif
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d88ae67217b1..55f431a28900 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -65,7 +65,7 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
if (btrfs_search_tree(&tmp_root, location, &path))
return res;
- if (btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
+ if (__btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
goto out;
if (item) {
@@ -98,7 +98,7 @@ int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
if (btrfs_search_tree(root, &key, &path))
return -1;
- if (btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
+ if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
goto out;
extent = btrfs_path_item_ptr(&path, struct btrfs_file_extent_item);
@@ -333,7 +333,7 @@ u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
if (btrfs_search_tree(root, &key, &path))
return -1ULL;
- if (btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
+ if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
if (btrfs_prev_slot(&path))
goto out;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 10/26] fs: btrfs: Rename struct btrfs_path to struct __btrfs_path
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
To avoid name conflicting between the extent buffer based btrfs_path
from btrfs-progs.
Also rename btrfs_free_path() to __btrfs_free_path() to avoid conflicts.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.h | 4 ++--
fs/btrfs/chunk-map.c | 4 ++--
fs/btrfs/ctree.c | 16 ++++++++--------
fs/btrfs/ctree.h | 20 ++++++++++----------
fs/btrfs/dir-item.c | 10 +++++-----
fs/btrfs/extent-io.c | 4 ++--
fs/btrfs/inode.c | 16 ++++++++--------
fs/btrfs/root.c | 10 +++++-----
fs/btrfs/subvolume.c | 4 ++--
9 files changed, 44 insertions(+), 44 deletions(-)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index baceea2edb90..8b8f40d29388 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -67,10 +67,10 @@ u64 btrfs_file_read(const struct btrfs_root *, u64, u64, u64, char *);
u64 btrfs_get_default_subvol_objectid(void);
/* extent-io.c */
-u64 btrfs_read_extent_inline(struct btrfs_path *,
+u64 btrfs_read_extent_inline(struct __btrfs_path *,
struct btrfs_file_extent_item *, u64, u64,
char *);
-u64 btrfs_read_extent_reg(struct btrfs_path *, struct btrfs_file_extent_item *,
+u64 btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
u64, u64, char *);
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
index 0c9a659f8fff..85c3efc63e16 100644
--- a/fs/btrfs/chunk-map.c
+++ b/fs/btrfs/chunk-map.c
@@ -143,7 +143,7 @@ int btrfs_chunk_map_init(void)
int btrfs_read_chunk_tree(void)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key, *found_key;
struct btrfs_chunk *chunk;
int res = 0;
@@ -168,7 +168,7 @@ int btrfs_read_chunk_tree(void)
}
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
if (res < 0)
return -1;
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 4e7f213f71ed..25a69000dc4f 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -114,7 +114,7 @@ int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
return generic_bin_search(addr, size, key, p->header.nritems, slot);
}
-static void clear_path(struct btrfs_path *p)
+static void clear_path(struct __btrfs_path *p)
{
int i;
@@ -124,7 +124,7 @@ static void clear_path(struct btrfs_path *p)
}
}
-void btrfs_free_path(struct btrfs_path *p)
+void __btrfs_free_path(struct __btrfs_path *p)
{
int i;
@@ -181,7 +181,7 @@ static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
}
int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
- struct btrfs_path *p)
+ struct __btrfs_path *p)
{
u8 lvl, prev_lvl;
int i, slot, ret;
@@ -235,13 +235,13 @@ int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
return 0;
err:
- btrfs_free_path(p);
+ __btrfs_free_path(p);
return -1;
}
-static int jump_leaf(struct btrfs_path *path, int dir)
+static int jump_leaf(struct __btrfs_path *path, int dir)
{
- struct btrfs_path p;
+ struct __btrfs_path p;
u32 slot;
int level = 1, from_level, i;
@@ -301,7 +301,7 @@ err:
return -1;
}
-int btrfs_prev_slot(struct btrfs_path *p)
+int btrfs_prev_slot(struct __btrfs_path *p)
{
if (!p->slots[0])
return jump_leaf(p, -1);
@@ -310,7 +310,7 @@ int btrfs_prev_slot(struct btrfs_path *p)
return 0;
}
-int btrfs_next_slot(struct btrfs_path *p)
+int btrfs_next_slot(struct __btrfs_path *p)
{
struct btrfs_leaf *leaf = &p->nodes[0]->leaf;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 52ebce6cded4..b98e5f8ac0a1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1176,7 +1176,7 @@ union btrfs_tree_node {
struct btrfs_node node;
};
-struct btrfs_path {
+struct __btrfs_path {
union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
u32 slots[BTRFS_MAX_LEVEL];
};
@@ -1190,20 +1190,20 @@ struct btrfs_root {
int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void btrfs_free_path(struct btrfs_path *);
+void __btrfs_free_path(struct __btrfs_path *);
int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_path *);
-int btrfs_prev_slot(struct btrfs_path *);
-int btrfs_next_slot(struct btrfs_path *);
+ struct __btrfs_path *);
+int btrfs_prev_slot(struct __btrfs_path *);
+int btrfs_next_slot(struct __btrfs_path *);
-static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
+static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
/* At tree read time we have converted the endian for btrfs_disk_key */
return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
}
static inline struct btrfs_key *
btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
- u8 type, struct btrfs_path *path)
+ u8 type, struct __btrfs_path *path)
{
struct btrfs_key key, *res;
@@ -1216,14 +1216,14 @@ btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
res = btrfs_path_leaf_key(path);
if (btrfs_comp_keys_type(&key, res)) {
- btrfs_free_path(path);
+ __btrfs_free_path(path);
return NULL;
}
return res;
}
-static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+static inline u32 btrfs_path_item_size(struct __btrfs_path *p)
{
return p->nodes[0]->leaf.items[p->slots[0]].size;
}
@@ -1234,7 +1234,7 @@ static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+ leaf->items[slot].offset;
}
-static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+static inline void *btrfs_path_leaf_data(struct __btrfs_path *p)
{
return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
}
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 1ff446a45a85..5595542dabaa 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -32,7 +32,7 @@ static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
}
static struct btrfs_dir_item *
-btrfs_match_dir_item_name(struct btrfs_path *path, const char *name,
+btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
int name_len)
{
struct btrfs_dir_item *item;
@@ -65,7 +65,7 @@ int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_dir_item *res = NULL;
@@ -83,14 +83,14 @@ int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
if (res)
*item = *res;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res ? 0 : -1;
}
int btrfs_readdir(const struct btrfs_root *root, u64 dir,
btrfs_readdir_callback_t callback)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key, *found_key;
struct btrfs_dir_item *item;
int res = 0;
@@ -119,7 +119,7 @@ int btrfs_readdir(const struct btrfs_root *root, u64 dir,
break;
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res < 0 ? -1 : 0;
}
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index dc0832c8645f..456b8776ef67 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,7 +13,7 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 btrfs_read_extent_inline(struct btrfs_path *path,
+u64 btrfs_read_extent_inline(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
@@ -65,7 +65,7 @@ err:
return -1ULL;
}
-u64 btrfs_read_extent_reg(struct btrfs_path *path,
+u64 btrfs_read_extent_reg(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 55f431a28900..c0778726a0ec 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -11,7 +11,7 @@
u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key *key;
struct btrfs_inode_ref *ref;
u64 res = -1ULL;
@@ -40,7 +40,7 @@ u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
res = key->offset;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
@@ -50,7 +50,7 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
struct btrfs_root *new_root)
{
struct btrfs_root tmp_root = *root;
- struct btrfs_path path;
+ struct __btrfs_path path;
int res = -1;
if (location->type == BTRFS_ROOT_ITEM_KEY) {
@@ -79,13 +79,13 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
res = 0;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_file_extent_item *extent;
const char *data_ptr;
@@ -131,7 +131,7 @@ int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
target[extent->ram_bytes] = '\0';
res = 0;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
@@ -320,7 +320,7 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_file_extent_item *extent;
int res = 0;
@@ -379,6 +379,6 @@ u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
return -1ULL;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return rd_all;
}
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 61155e8918b8..9b5f645015ae 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -7,7 +7,7 @@
#include "btrfs.h"
-static void read_root_item(struct btrfs_path *p, struct btrfs_root_item *item)
+static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
{
u32 len;
int reset = 0;
@@ -34,7 +34,7 @@ static void read_root_item(struct btrfs_path *p, struct btrfs_root_item *item)
int btrfs_find_root(u64 objectid, struct btrfs_root *root,
struct btrfs_root_item *root_item)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_root_item my_root_item;
if (!btrfs_search_tree_key_type(&btrfs_info.tree_root, objectid,
@@ -51,13 +51,13 @@ int btrfs_find_root(u64 objectid, struct btrfs_root *root,
root->root_dirid = root_item->root_dirid;
}
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return 0;
}
u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key *key;
struct btrfs_root_ref *ref;
u64 res = -1ULL;
@@ -86,7 +86,7 @@ u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
res = key->offset;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index dbe92d13cb81..fa5ef1e0acb7 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -81,7 +81,7 @@ u64 btrfs_get_default_subvol_objectid(void)
static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
{
struct btrfs_key key, *found_key;
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_root_ref *ref;
int res;
@@ -116,7 +116,7 @@ static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
"subvolumes\n", __func__);
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
}
void btrfs_list_subvols(void)
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 10/26] fs: btrfs: Rename struct btrfs_path to struct __btrfs_path
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
To avoid name conflicting between the extent buffer based btrfs_path
from btrfs-progs.
Also rename btrfs_free_path() to __btrfs_free_path() to avoid conflicts.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.h | 4 ++--
fs/btrfs/chunk-map.c | 4 ++--
fs/btrfs/ctree.c | 16 ++++++++--------
fs/btrfs/ctree.h | 20 ++++++++++----------
fs/btrfs/dir-item.c | 10 +++++-----
fs/btrfs/extent-io.c | 4 ++--
fs/btrfs/inode.c | 16 ++++++++--------
fs/btrfs/root.c | 10 +++++-----
fs/btrfs/subvolume.c | 4 ++--
9 files changed, 44 insertions(+), 44 deletions(-)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index baceea2edb90..8b8f40d29388 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -67,10 +67,10 @@ u64 btrfs_file_read(const struct btrfs_root *, u64, u64, u64, char *);
u64 btrfs_get_default_subvol_objectid(void);
/* extent-io.c */
-u64 btrfs_read_extent_inline(struct btrfs_path *,
+u64 btrfs_read_extent_inline(struct __btrfs_path *,
struct btrfs_file_extent_item *, u64, u64,
char *);
-u64 btrfs_read_extent_reg(struct btrfs_path *, struct btrfs_file_extent_item *,
+u64 btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
u64, u64, char *);
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
index 0c9a659f8fff..85c3efc63e16 100644
--- a/fs/btrfs/chunk-map.c
+++ b/fs/btrfs/chunk-map.c
@@ -143,7 +143,7 @@ int btrfs_chunk_map_init(void)
int btrfs_read_chunk_tree(void)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key, *found_key;
struct btrfs_chunk *chunk;
int res = 0;
@@ -168,7 +168,7 @@ int btrfs_read_chunk_tree(void)
}
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
if (res < 0)
return -1;
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 4e7f213f71ed..25a69000dc4f 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -114,7 +114,7 @@ int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
return generic_bin_search(addr, size, key, p->header.nritems, slot);
}
-static void clear_path(struct btrfs_path *p)
+static void clear_path(struct __btrfs_path *p)
{
int i;
@@ -124,7 +124,7 @@ static void clear_path(struct btrfs_path *p)
}
}
-void btrfs_free_path(struct btrfs_path *p)
+void __btrfs_free_path(struct __btrfs_path *p)
{
int i;
@@ -181,7 +181,7 @@ static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
}
int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
- struct btrfs_path *p)
+ struct __btrfs_path *p)
{
u8 lvl, prev_lvl;
int i, slot, ret;
@@ -235,13 +235,13 @@ int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
return 0;
err:
- btrfs_free_path(p);
+ __btrfs_free_path(p);
return -1;
}
-static int jump_leaf(struct btrfs_path *path, int dir)
+static int jump_leaf(struct __btrfs_path *path, int dir)
{
- struct btrfs_path p;
+ struct __btrfs_path p;
u32 slot;
int level = 1, from_level, i;
@@ -301,7 +301,7 @@ err:
return -1;
}
-int btrfs_prev_slot(struct btrfs_path *p)
+int btrfs_prev_slot(struct __btrfs_path *p)
{
if (!p->slots[0])
return jump_leaf(p, -1);
@@ -310,7 +310,7 @@ int btrfs_prev_slot(struct btrfs_path *p)
return 0;
}
-int btrfs_next_slot(struct btrfs_path *p)
+int btrfs_next_slot(struct __btrfs_path *p)
{
struct btrfs_leaf *leaf = &p->nodes[0]->leaf;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 52ebce6cded4..b98e5f8ac0a1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1176,7 +1176,7 @@ union btrfs_tree_node {
struct btrfs_node node;
};
-struct btrfs_path {
+struct __btrfs_path {
union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
u32 slots[BTRFS_MAX_LEVEL];
};
@@ -1190,20 +1190,20 @@ struct btrfs_root {
int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void btrfs_free_path(struct btrfs_path *);
+void __btrfs_free_path(struct __btrfs_path *);
int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_path *);
-int btrfs_prev_slot(struct btrfs_path *);
-int btrfs_next_slot(struct btrfs_path *);
+ struct __btrfs_path *);
+int btrfs_prev_slot(struct __btrfs_path *);
+int btrfs_next_slot(struct __btrfs_path *);
-static inline struct btrfs_key *btrfs_path_leaf_key(struct btrfs_path *p) {
+static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
/* At tree read time we have converted the endian for btrfs_disk_key */
return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
}
static inline struct btrfs_key *
btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
- u8 type, struct btrfs_path *path)
+ u8 type, struct __btrfs_path *path)
{
struct btrfs_key key, *res;
@@ -1216,14 +1216,14 @@ btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
res = btrfs_path_leaf_key(path);
if (btrfs_comp_keys_type(&key, res)) {
- btrfs_free_path(path);
+ __btrfs_free_path(path);
return NULL;
}
return res;
}
-static inline u32 btrfs_path_item_size(struct btrfs_path *p)
+static inline u32 btrfs_path_item_size(struct __btrfs_path *p)
{
return p->nodes[0]->leaf.items[p->slots[0]].size;
}
@@ -1234,7 +1234,7 @@ static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
+ leaf->items[slot].offset;
}
-static inline void *btrfs_path_leaf_data(struct btrfs_path *p)
+static inline void *btrfs_path_leaf_data(struct __btrfs_path *p)
{
return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
}
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 1ff446a45a85..5595542dabaa 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -32,7 +32,7 @@ static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
}
static struct btrfs_dir_item *
-btrfs_match_dir_item_name(struct btrfs_path *path, const char *name,
+btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
int name_len)
{
struct btrfs_dir_item *item;
@@ -65,7 +65,7 @@ int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_dir_item *res = NULL;
@@ -83,14 +83,14 @@ int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
if (res)
*item = *res;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res ? 0 : -1;
}
int btrfs_readdir(const struct btrfs_root *root, u64 dir,
btrfs_readdir_callback_t callback)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key, *found_key;
struct btrfs_dir_item *item;
int res = 0;
@@ -119,7 +119,7 @@ int btrfs_readdir(const struct btrfs_root *root, u64 dir,
break;
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res < 0 ? -1 : 0;
}
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index dc0832c8645f..456b8776ef67 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,7 +13,7 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 btrfs_read_extent_inline(struct btrfs_path *path,
+u64 btrfs_read_extent_inline(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
@@ -65,7 +65,7 @@ err:
return -1ULL;
}
-u64 btrfs_read_extent_reg(struct btrfs_path *path,
+u64 btrfs_read_extent_reg(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 55f431a28900..c0778726a0ec 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -11,7 +11,7 @@
u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key *key;
struct btrfs_inode_ref *ref;
u64 res = -1ULL;
@@ -40,7 +40,7 @@ u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
res = key->offset;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
@@ -50,7 +50,7 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
struct btrfs_root *new_root)
{
struct btrfs_root tmp_root = *root;
- struct btrfs_path path;
+ struct __btrfs_path path;
int res = -1;
if (location->type == BTRFS_ROOT_ITEM_KEY) {
@@ -79,13 +79,13 @@ int btrfs_lookup_inode(const struct btrfs_root *root,
res = 0;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_file_extent_item *extent;
const char *data_ptr;
@@ -131,7 +131,7 @@ int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
target[extent->ram_bytes] = '\0';
res = 0;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
@@ -320,7 +320,7 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key key;
struct btrfs_file_extent_item *extent;
int res = 0;
@@ -379,6 +379,6 @@ u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
return -1ULL;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return rd_all;
}
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 61155e8918b8..9b5f645015ae 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -7,7 +7,7 @@
#include "btrfs.h"
-static void read_root_item(struct btrfs_path *p, struct btrfs_root_item *item)
+static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
{
u32 len;
int reset = 0;
@@ -34,7 +34,7 @@ static void read_root_item(struct btrfs_path *p, struct btrfs_root_item *item)
int btrfs_find_root(u64 objectid, struct btrfs_root *root,
struct btrfs_root_item *root_item)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_root_item my_root_item;
if (!btrfs_search_tree_key_type(&btrfs_info.tree_root, objectid,
@@ -51,13 +51,13 @@ int btrfs_find_root(u64 objectid, struct btrfs_root *root,
root->root_dirid = root_item->root_dirid;
}
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return 0;
}
u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
{
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_key *key;
struct btrfs_root_ref *ref;
u64 res = -1ULL;
@@ -86,7 +86,7 @@ u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
res = key->offset;
out:
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
return res;
}
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index dbe92d13cb81..fa5ef1e0acb7 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -81,7 +81,7 @@ u64 btrfs_get_default_subvol_objectid(void)
static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
{
struct btrfs_key key, *found_key;
- struct btrfs_path path;
+ struct __btrfs_path path;
struct btrfs_root_ref *ref;
int res;
@@ -116,7 +116,7 @@ static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
"subvolumes\n", __func__);
} while (!(res = btrfs_next_slot(&path)));
- btrfs_free_path(&path);
+ __btrfs_free_path(&path);
}
void btrfs_list_subvols(void)
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 11/26] fs: btrfs: Rename btrfs_root to __btrfs_root
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This is to avoid naming conflicts between extent buffer based
btrfs_root.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 10 +++++-----
fs/btrfs/btrfs.h | 26 +++++++++++++-------------
fs/btrfs/ctree.c | 2 +-
fs/btrfs/ctree.h | 6 +++---
fs/btrfs/dir-item.c | 4 ++--
fs/btrfs/inode.c | 16 ++++++++--------
fs/btrfs/root.c | 2 +-
fs/btrfs/subvolume.c | 2 +-
8 files changed, 34 insertions(+), 34 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index ec993a193106..1cb56ea0124d 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -14,7 +14,7 @@
struct btrfs_info btrfs_info;
-static int readdir_callback(const struct btrfs_root *root,
+static int readdir_callback(const struct __btrfs_root *root,
struct btrfs_dir_item *item)
{
static const char typestr[BTRFS_FT_MAX][4] = {
@@ -114,7 +114,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
int btrfs_ls(const char *path)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
@@ -140,7 +140,7 @@ int btrfs_ls(const char *path)
int btrfs_exists(const char *file)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
@@ -151,7 +151,7 @@ int btrfs_exists(const char *file)
int btrfs_size(const char *file, loff_t *size)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr;
u8 type;
@@ -176,7 +176,7 @@ int btrfs_size(const char *file, loff_t *size)
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr, rd;
u8 type;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 8b8f40d29388..57cdb5aad58c 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -14,9 +14,9 @@
struct btrfs_info {
struct btrfs_super_block sb;
- struct btrfs_root tree_root;
- struct btrfs_root fs_root;
- struct btrfs_root chunk_root;
+ struct __btrfs_root tree_root;
+ struct __btrfs_root fs_root;
+ struct __btrfs_root chunk_root;
struct rb_root chunks_root;
};
@@ -42,26 +42,26 @@ u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
int btrfs_read_superblock(void);
/* dir-item.c */
-typedef int (*btrfs_readdir_callback_t)(const struct btrfs_root *,
+typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
struct btrfs_dir_item *);
-int btrfs_lookup_dir_item(const struct btrfs_root *, u64, const char *, int,
+int btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
-int btrfs_readdir(const struct btrfs_root *, u64, btrfs_readdir_callback_t);
+int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
/* root.c */
-int btrfs_find_root(u64, struct btrfs_root *, struct btrfs_root_item *);
+int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
/* inode.c */
-u64 btrfs_lookup_inode_ref(struct btrfs_root *, u64, struct btrfs_inode_ref *,
+u64 btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
char *);
-int btrfs_lookup_inode(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_inode_item *, struct btrfs_root *);
-int btrfs_readlink(const struct btrfs_root *, u64, char *);
-u64 btrfs_lookup_path(struct btrfs_root *, u64, const char *, u8 *,
+int btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
+ struct btrfs_inode_item *, struct __btrfs_root *);
+int btrfs_readlink(const struct __btrfs_root *, u64, char *);
+u64 btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
-u64 btrfs_file_read(const struct btrfs_root *, u64, u64, u64, char *);
+u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 25a69000dc4f..68f38a97b80e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -180,7 +180,7 @@ static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
return 0;
}
-int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
+int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
struct __btrfs_path *p)
{
u8 lvl, prev_lvl;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b98e5f8ac0a1..f068db6505e0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1181,7 +1181,7 @@ struct __btrfs_path {
u32 slots[BTRFS_MAX_LEVEL];
};
-struct btrfs_root {
+struct __btrfs_root {
u64 objectid;
u64 bytenr;
u64 root_dirid;
@@ -1191,7 +1191,7 @@ int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void __btrfs_free_path(struct __btrfs_path *);
-int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
+int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
struct __btrfs_path *);
int btrfs_prev_slot(struct __btrfs_path *);
int btrfs_next_slot(struct __btrfs_path *);
@@ -1202,7 +1202,7 @@ static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
}
static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
+btrfs_search_tree_key_type(const struct __btrfs_root *root, u64 objectid,
u8 type, struct __btrfs_path *path)
{
struct btrfs_key key, *res;
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 5595542dabaa..756918df2e13 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -61,7 +61,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
return NULL;
}
-int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
+int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
@@ -87,7 +87,7 @@ out:
return res ? 0 : -1;
}
-int btrfs_readdir(const struct btrfs_root *root, u64 dir,
+int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
btrfs_readdir_callback_t callback)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c0778726a0ec..be385d8a3f98 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include <malloc.h>
-u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
+u64 btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
struct __btrfs_path path;
@@ -44,12 +44,12 @@ out:
return res;
}
-int btrfs_lookup_inode(const struct btrfs_root *root,
+int btrfs_lookup_inode(const struct __btrfs_root *root,
struct btrfs_key *location,
struct btrfs_inode_item *item,
- struct btrfs_root *new_root)
+ struct __btrfs_root *new_root)
{
- struct btrfs_root tmp_root = *root;
+ struct __btrfs_root tmp_root = *root;
struct __btrfs_path path;
int res = -1;
@@ -83,7 +83,7 @@ out:
return res;
}
-int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
+int btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
{
struct __btrfs_path path;
struct btrfs_key key;
@@ -137,7 +137,7 @@ out:
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
-static u64 get_parent_inode(struct btrfs_root *root, u64 inr,
+static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_item *inode_item)
{
struct btrfs_key key;
@@ -209,7 +209,7 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
-u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
+u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
{
@@ -317,7 +317,7 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
return inr;
}
-u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
+u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 9b5f645015ae..a424966df61e 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -31,7 +31,7 @@ static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
}
}
-int btrfs_find_root(u64 objectid, struct btrfs_root *root,
+int btrfs_find_root(u64 objectid, struct __btrfs_root *root,
struct btrfs_root_item *root_item)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index fa5ef1e0acb7..72b847b940da 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -12,7 +12,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
{
struct btrfs_root_ref rref;
struct btrfs_inode_ref iref;
- struct btrfs_root root;
+ struct __btrfs_root root;
u64 dir;
char tmp[BTRFS_NAME_LEN];
char *ptr;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 11/26] fs: btrfs: Rename btrfs_root to __btrfs_root
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This is to avoid naming conflicts between extent buffer based
btrfs_root.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 10 +++++-----
fs/btrfs/btrfs.h | 26 +++++++++++++-------------
fs/btrfs/ctree.c | 2 +-
fs/btrfs/ctree.h | 6 +++---
fs/btrfs/dir-item.c | 4 ++--
fs/btrfs/inode.c | 16 ++++++++--------
fs/btrfs/root.c | 2 +-
fs/btrfs/subvolume.c | 2 +-
8 files changed, 34 insertions(+), 34 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index ec993a193106..1cb56ea0124d 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -14,7 +14,7 @@
struct btrfs_info btrfs_info;
-static int readdir_callback(const struct btrfs_root *root,
+static int readdir_callback(const struct __btrfs_root *root,
struct btrfs_dir_item *item)
{
static const char typestr[BTRFS_FT_MAX][4] = {
@@ -114,7 +114,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
int btrfs_ls(const char *path)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
@@ -140,7 +140,7 @@ int btrfs_ls(const char *path)
int btrfs_exists(const char *file)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
@@ -151,7 +151,7 @@ int btrfs_exists(const char *file)
int btrfs_size(const char *file, loff_t *size)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr;
u8 type;
@@ -176,7 +176,7 @@ int btrfs_size(const char *file, loff_t *size)
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
- struct btrfs_root root = btrfs_info.fs_root;
+ struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr, rd;
u8 type;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 8b8f40d29388..57cdb5aad58c 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -14,9 +14,9 @@
struct btrfs_info {
struct btrfs_super_block sb;
- struct btrfs_root tree_root;
- struct btrfs_root fs_root;
- struct btrfs_root chunk_root;
+ struct __btrfs_root tree_root;
+ struct __btrfs_root fs_root;
+ struct __btrfs_root chunk_root;
struct rb_root chunks_root;
};
@@ -42,26 +42,26 @@ u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
int btrfs_read_superblock(void);
/* dir-item.c */
-typedef int (*btrfs_readdir_callback_t)(const struct btrfs_root *,
+typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
struct btrfs_dir_item *);
-int btrfs_lookup_dir_item(const struct btrfs_root *, u64, const char *, int,
+int btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
-int btrfs_readdir(const struct btrfs_root *, u64, btrfs_readdir_callback_t);
+int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
/* root.c */
-int btrfs_find_root(u64, struct btrfs_root *, struct btrfs_root_item *);
+int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
/* inode.c */
-u64 btrfs_lookup_inode_ref(struct btrfs_root *, u64, struct btrfs_inode_ref *,
+u64 btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
char *);
-int btrfs_lookup_inode(const struct btrfs_root *, struct btrfs_key *,
- struct btrfs_inode_item *, struct btrfs_root *);
-int btrfs_readlink(const struct btrfs_root *, u64, char *);
-u64 btrfs_lookup_path(struct btrfs_root *, u64, const char *, u8 *,
+int btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
+ struct btrfs_inode_item *, struct __btrfs_root *);
+int btrfs_readlink(const struct __btrfs_root *, u64, char *);
+u64 btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
-u64 btrfs_file_read(const struct btrfs_root *, u64, u64, u64, char *);
+u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 25a69000dc4f..68f38a97b80e 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -180,7 +180,7 @@ static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
return 0;
}
-int btrfs_search_tree(const struct btrfs_root *root, struct btrfs_key *key,
+int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
struct __btrfs_path *p)
{
u8 lvl, prev_lvl;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index b98e5f8ac0a1..f068db6505e0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1181,7 +1181,7 @@ struct __btrfs_path {
u32 slots[BTRFS_MAX_LEVEL];
};
-struct btrfs_root {
+struct __btrfs_root {
u64 objectid;
u64 bytenr;
u64 root_dirid;
@@ -1191,7 +1191,7 @@ int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void __btrfs_free_path(struct __btrfs_path *);
-int btrfs_search_tree(const struct btrfs_root *, struct btrfs_key *,
+int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
struct __btrfs_path *);
int btrfs_prev_slot(struct __btrfs_path *);
int btrfs_next_slot(struct __btrfs_path *);
@@ -1202,7 +1202,7 @@ static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
}
static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct btrfs_root *root, u64 objectid,
+btrfs_search_tree_key_type(const struct __btrfs_root *root, u64 objectid,
u8 type, struct __btrfs_path *path)
{
struct btrfs_key key, *res;
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 5595542dabaa..756918df2e13 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -61,7 +61,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
return NULL;
}
-int btrfs_lookup_dir_item(const struct btrfs_root *root, u64 dir,
+int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
@@ -87,7 +87,7 @@ out:
return res ? 0 : -1;
}
-int btrfs_readdir(const struct btrfs_root *root, u64 dir,
+int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
btrfs_readdir_callback_t callback)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c0778726a0ec..be385d8a3f98 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include <malloc.h>
-u64 btrfs_lookup_inode_ref(struct btrfs_root *root, u64 inr,
+u64 btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
struct __btrfs_path path;
@@ -44,12 +44,12 @@ out:
return res;
}
-int btrfs_lookup_inode(const struct btrfs_root *root,
+int btrfs_lookup_inode(const struct __btrfs_root *root,
struct btrfs_key *location,
struct btrfs_inode_item *item,
- struct btrfs_root *new_root)
+ struct __btrfs_root *new_root)
{
- struct btrfs_root tmp_root = *root;
+ struct __btrfs_root tmp_root = *root;
struct __btrfs_path path;
int res = -1;
@@ -83,7 +83,7 @@ out:
return res;
}
-int btrfs_readlink(const struct btrfs_root *root, u64 inr, char *target)
+int btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
{
struct __btrfs_path path;
struct btrfs_key key;
@@ -137,7 +137,7 @@ out:
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
-static u64 get_parent_inode(struct btrfs_root *root, u64 inr,
+static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_item *inode_item)
{
struct btrfs_key key;
@@ -209,7 +209,7 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
-u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
+u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
{
@@ -317,7 +317,7 @@ u64 btrfs_lookup_path(struct btrfs_root *root, u64 inr, const char *path,
return inr;
}
-u64 btrfs_file_read(const struct btrfs_root *root, u64 inr, u64 offset,
+u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
index 9b5f645015ae..a424966df61e 100644
--- a/fs/btrfs/root.c
+++ b/fs/btrfs/root.c
@@ -31,7 +31,7 @@ static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
}
}
-int btrfs_find_root(u64 objectid, struct btrfs_root *root,
+int btrfs_find_root(u64 objectid, struct __btrfs_root *root,
struct btrfs_root_item *root_item)
{
struct __btrfs_path path;
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index fa5ef1e0acb7..72b847b940da 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -12,7 +12,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
{
struct btrfs_root_ref rref;
struct btrfs_inode_ref iref;
- struct btrfs_root root;
+ struct __btrfs_root root;
u64 dir;
char tmp[BTRFS_NAME_LEN];
char *ptr;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 12/26] fs: btrfs: Cross port struct btrfs_root to ctree.h
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
With write related members deleted.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f068db6505e0..e8dcab1a0b5d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -68,6 +68,23 @@ enum btrfs_tree_block_status {
BTRFS_TREE_BLOCK_INVALID_OFFSETS,
};
+struct btrfs_root {
+ struct extent_buffer *node;
+ struct btrfs_root_item root_item;
+ struct btrfs_key root_key;
+ struct btrfs_fs_info *fs_info;
+ u64 objectid;
+ u64 last_trans;
+
+ int ref_cows;
+ int track_dirty;
+
+ u32 type;
+ u64 last_inode_alloc;
+
+ struct rb_node rb_node;
+};
+
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 12/26] fs: btrfs: Cross port struct btrfs_root to ctree.h
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
With write related members deleted.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f068db6505e0..e8dcab1a0b5d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -68,6 +68,23 @@ enum btrfs_tree_block_status {
BTRFS_TREE_BLOCK_INVALID_OFFSETS,
};
+struct btrfs_root {
+ struct extent_buffer *node;
+ struct btrfs_root_item root_item;
+ struct btrfs_key root_key;
+ struct btrfs_fs_info *fs_info;
+ u64 objectid;
+ u64 last_trans;
+
+ int ref_cows;
+ int track_dirty;
+
+ u32 type;
+ u64 last_inode_alloc;
+
+ struct rb_node rb_node;
+};
+
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 13/26] fs: btrfs: Crossport btrfs_search_slot() from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This patch copies the core function, btrfs_search_slot() from
btrfs-progs.
This version has the following function removed:
- The ability to COW tree block
Related code is commented, as we may still need this ability later.
- The readahead functionality
That readahead is abused in kernel. Remove it completely.
With the core function in place, btrfs developers should feel at home now.
This also crossports supportive codes like btrfs_previous_item() to
ctree.[ch].
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.c | 536 ++++++++++++++++++++++++++++++++++++++++++++++-
fs/btrfs/ctree.h | 61 +++++-
2 files changed, 591 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 68f38a97b80e..20c68a154d14 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -5,9 +5,11 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
-#include "btrfs.h"
+#include <linux/kernel.h>
#include <malloc.h>
#include <memalign.h>
+#include "btrfs.h"
+#include "disk-io.h"
static const struct btrfs_csum {
u16 size;
@@ -41,6 +43,32 @@ u16 btrfs_csum_type_size(u16 csum_type)
return btrfs_csums[csum_type].size;
}
+struct btrfs_path *btrfs_alloc_path(void)
+{
+ struct btrfs_path *path;
+ path = kzalloc(sizeof(struct btrfs_path), GFP_NOFS);
+ return path;
+}
+
+void btrfs_free_path(struct btrfs_path *p)
+{
+ if (!p)
+ return;
+ btrfs_release_path(p);
+ kfree(p);
+}
+
+void btrfs_release_path(struct btrfs_path *p)
+{
+ int i;
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (!p->nodes[i])
+ continue;
+ free_extent_buffer(p->nodes[i]);
+ }
+ memset(p, 0, sizeof(*p));
+}
+
int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
@@ -71,7 +99,17 @@ int btrfs_comp_keys_type(struct btrfs_key *a, struct btrfs_key *b)
return 0;
}
-static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
+/*
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
+ * the slot in the array is returned via slot, and it points to
+ * the place where you would insert key if it is not found in
+ * the array.
+ *
+ * slot may point to max if the key is bigger than all of the keys
+ */
+static int __generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
int max, int *slot)
{
int low = 0, high = max, mid, ret;
@@ -97,7 +135,7 @@ static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
return 1;
}
-int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
+int __btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
int *slot)
{
void *addr;
@@ -111,7 +149,7 @@ int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
size = sizeof(struct btrfs_item);
}
- return generic_bin_search(addr, size, key, p->header.nritems, slot);
+ return __generic_bin_search(addr, size, key, p->header.nritems, slot);
}
static void clear_path(struct __btrfs_path *p)
@@ -208,7 +246,7 @@ int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
}
prev_lvl = lvl;
- ret = btrfs_bin_search(buf, key, &slot);
+ ret = __btrfs_bin_search(buf, key, &slot);
if (ret < 0)
goto err;
if (ret && slot > 0 && lvl)
@@ -463,6 +501,350 @@ fail:
return ret;
}
+static int noinline check_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path, int level)
+{
+ struct btrfs_disk_key key;
+ struct btrfs_disk_key *key_ptr = NULL;
+ struct extent_buffer *parent;
+ enum btrfs_tree_block_status ret;
+
+ if (path->nodes[level + 1]) {
+ parent = path->nodes[level + 1];
+ btrfs_node_key(parent, &key, path->slots[level + 1]);
+ key_ptr = &key;
+ }
+ if (level == 0)
+ ret = btrfs_check_leaf(fs_info, key_ptr, path->nodes[0]);
+ else
+ ret = btrfs_check_node(fs_info, key_ptr, path->nodes[level]);
+ if (ret == BTRFS_TREE_BLOCK_CLEAN)
+ return 0;
+ return -EIO;
+}
+
+/*
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
+ * the slot in the array is returned via slot, and it points to
+ * the place where you would insert key if it is not found in
+ * the array.
+ *
+ * slot may point to max if the key is bigger than all of the keys
+ */
+static int generic_bin_search(struct extent_buffer *eb, unsigned long p,
+ int item_size, const struct btrfs_key *key,
+ int max, int *slot)
+{
+ int low = 0;
+ int high = max;
+ int mid;
+ int ret;
+ unsigned long offset;
+ struct btrfs_disk_key *tmp;
+
+ while(low < high) {
+ mid = (low + high) / 2;
+ offset = p + mid * item_size;
+
+ tmp = (struct btrfs_disk_key *)(eb->data + offset);
+ ret = btrfs_comp_keys(tmp, key);
+
+ if (ret < 0)
+ low = mid + 1;
+ else if (ret > 0)
+ high = mid;
+ else {
+ *slot = mid;
+ return 0;
+ }
+ }
+ *slot = low;
+ return 1;
+}
+
+/*
+ * simple bin_search frontend that does the right thing for
+ * leaves vs nodes
+ */
+int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
+ int *slot)
+{
+ if (btrfs_header_level(eb) == 0)
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_leaf, items),
+ sizeof(struct btrfs_item),
+ key, btrfs_header_nritems(eb),
+ slot);
+ else
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
+ sizeof(struct btrfs_key_ptr),
+ key, btrfs_header_nritems(eb),
+ slot);
+}
+
+struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *parent, int slot)
+{
+ struct extent_buffer *ret;
+ int level = btrfs_header_level(parent);
+
+ if (slot < 0)
+ return NULL;
+ if (slot >= btrfs_header_nritems(parent))
+ return NULL;
+
+ if (level == 0)
+ return NULL;
+
+ ret = read_tree_block(fs_info, btrfs_node_blockptr(parent, slot),
+ btrfs_node_ptr_generation(parent, slot));
+ if (!extent_buffer_uptodate(ret))
+ return ERR_PTR(-EIO);
+
+ if (btrfs_header_level(ret) != level - 1) {
+ error(
+"child eb corrupted: parent bytenr=%llu item=%d parent level=%d child level=%d",
+ btrfs_header_bytenr(parent), slot,
+ btrfs_header_level(parent), btrfs_header_level(ret));
+ free_extent_buffer(ret);
+ return ERR_PTR(-EIO);
+ }
+ return ret;
+}
+
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key)
+{
+ int ret;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
+
+ key.type = key_type;
+ key.objectid = iobjectid;
+ key.offset = ioff;
+
+ if (found_path == NULL) {
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ } else
+ path = found_path;
+
+ ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
+ if ((ret < 0) || (found_key == NULL))
+ goto out;
+
+ eb = path->nodes[0];
+ if (ret && path->slots[0] >= btrfs_header_nritems(eb)) {
+ ret = btrfs_next_leaf(fs_root, path);
+ if (ret)
+ goto out;
+ eb = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(eb, found_key, path->slots[0]);
+ if (found_key->type != key.type ||
+ found_key->objectid != key.objectid) {
+ ret = 1;
+ goto out;
+ }
+
+out:
+ if (path != found_path)
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * look for key in the tree. path is filled in with nodes along the way
+ * if key is found, we return zero and you can find the item in the leaf
+ * level of the path (level 0)
+ *
+ * If the key isn't found, the path points to the slot where it should
+ * be inserted, and 1 is returned. If there are other errors during the
+ * search a negative error number is returned.
+ *
+ * if ins_len > 0, nodes and leaves will be split as we walk down the
+ * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if
+ * possible)
+ *
+ * NOTE: This version has no COW ability, thus we expect trans == NULL,
+ * ins_len == 0 and cow == 0.
+ */
+int btrfs_search_slot(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const struct btrfs_key *key,
+ struct btrfs_path *p, int ins_len, int cow)
+{
+ struct extent_buffer *b;
+ int slot;
+ int ret;
+ int level;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ u8 lowest_level = 0;
+
+ assert(trans == NULL && ins_len == 0 && cow == 0);
+ lowest_level = p->lowest_level;
+ WARN_ON(lowest_level && ins_len > 0);
+ WARN_ON(p->nodes[0] != NULL);
+
+ b = root->node;
+ extent_buffer_get(b);
+ while (b) {
+ level = btrfs_header_level(b);
+ /*
+ if (cow) {
+ int wret;
+ wret = btrfs_cow_block(trans, root, b,
+ p->nodes[level + 1],
+ p->slots[level + 1],
+ &b);
+ if (wret) {
+ free_extent_buffer(b);
+ return wret;
+ }
+ }
+ */
+ BUG_ON(!cow && ins_len);
+ if (level != btrfs_header_level(b))
+ WARN_ON(1);
+ level = btrfs_header_level(b);
+ p->nodes[level] = b;
+ ret = check_block(fs_info, p, level);
+ if (ret)
+ return -1;
+ ret = btrfs_bin_search(b, key, &slot);
+ if (level != 0) {
+ if (ret && slot > 0)
+ slot -= 1;
+ p->slots[level] = slot;
+ /*
+ if ((p->search_for_split || ins_len > 0) &&
+ btrfs_header_nritems(b) >=
+ BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 3) {
+ int sret = split_node(trans, root, p, level);
+ BUG_ON(sret > 0);
+ if (sret)
+ return sret;
+ b = p->nodes[level];
+ slot = p->slots[level];
+ } else if (ins_len < 0) {
+ int sret = balance_level(trans, root, p,
+ level);
+ if (sret)
+ return sret;
+ b = p->nodes[level];
+ if (!b) {
+ btrfs_release_path(p);
+ goto again;
+ }
+ slot = p->slots[level];
+ BUG_ON(btrfs_header_nritems(b) == 1);
+ }
+ */
+ /* this is only true while dropping a snapshot */
+ if (level == lowest_level)
+ break;
+
+ b = read_node_slot(fs_info, b, slot);
+ if (!extent_buffer_uptodate(b))
+ return -EIO;
+ } else {
+ p->slots[level] = slot;
+ /*
+ if (ins_len > 0 &&
+ ins_len > btrfs_leaf_free_space(b)) {
+ int sret = split_leaf(trans, root, key,
+ p, ins_len, ret == 0);
+ BUG_ON(sret > 0);
+ if (sret)
+ return sret;
+ }
+ */
+ return ret;
+ }
+ }
+ return 1;
+}
+
+/*
+ * Helper to use instead of search slot if no exact match is needed but
+ * instead the next or previous item should be returned.
+ * When find_higher is true, the next higher item is returned, the next lower
+ * otherwise.
+ * When return_any and find_higher are both true, and no higher item is found,
+ * return the next lower instead.
+ * When return_any is true and find_higher is false, and no lower item is found,
+ * return the next higher instead.
+ * It returns 0 if any item is found, 1 if none is found (tree empty), and
+ * < 0 on error
+ */
+int btrfs_search_slot_for_read(struct btrfs_root *root,
+ const struct btrfs_key *key,
+ struct btrfs_path *p, int find_higher,
+ int return_any)
+{
+ int ret;
+ struct extent_buffer *leaf;
+
+again:
+ ret = btrfs_search_slot(NULL, root, key, p, 0, 0);
+ if (ret <= 0)
+ return ret;
+ /*
+ * A return value of 1 means the path is at the position where the item
+ * should be inserted. Normally this is the next bigger item, but in
+ * case the previous item is the last in a leaf, path points to the
+ * first free slot in the previous leaf, i.e. at an invalid item.
+ */
+ leaf = p->nodes[0];
+
+ if (find_higher) {
+ if (p->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, p);
+ if (ret <= 0)
+ return ret;
+ if (!return_any)
+ return 1;
+ /*
+ * No higher item found, return the next lower instead
+ */
+ return_any = 0;
+ find_higher = 0;
+ btrfs_release_path(p);
+ goto again;
+ }
+ } else {
+ if (p->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, p);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ leaf = p->nodes[0];
+ if (p->slots[0] == btrfs_header_nritems(leaf))
+ p->slots[0]--;
+ return 0;
+ }
+ if (!return_any)
+ return 1;
+ /*
+ * No lower item found, return the next higher instead
+ */
+ return_any = 0;
+ find_higher = 1;
+ btrfs_release_path(p);
+ goto again;
+ } else {
+ --p->slots[0];
+ }
+ }
+ return 0;
+}
+
/*
* how many bytes are required to store the items in a leaf. start
* and nr indicate which items in the leaf to check. This totals up the
@@ -504,3 +886,147 @@ int btrfs_leaf_free_space(struct extent_buffer *leaf)
}
return ret;
}
+
+/*
+ * walk up the tree as far as required to find the previous leaf.
+ * returns 0 if it found something or 1 if there are no lesser leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
+{
+ int slot;
+ int level = 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+
+ while(level < BTRFS_MAX_LEVEL) {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level];
+ c = path->nodes[level];
+ if (slot == 0) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
+ continue;
+ }
+ slot--;
+
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ break;
+ }
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ free_extent_buffer(c);
+ slot = btrfs_header_nritems(next);
+ if (slot != 0)
+ slot--;
+ path->nodes[level] = next;
+ path->slots[level] = slot;
+ if (!level)
+ break;
+ next = read_node_slot(fs_info, next, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Walk up the tree as far as necessary to find the next sibling tree block.
+ * More generic version of btrfs_next_leaf(), as it could find sibling nodes
+ * if @path->lowest_level is not 0.
+ *
+ * returns 0 if it found something or 1 if there are no greater leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path)
+{
+ int slot;
+ int level = path->lowest_level + 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+
+ BUG_ON(path->lowest_level + 1 >= BTRFS_MAX_LEVEL);
+ do {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level] + 1;
+ c = path->nodes[level];
+ if (slot >= btrfs_header_nritems(c)) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
+ continue;
+ }
+
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
+ break;
+ } while (level < BTRFS_MAX_LEVEL);
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ free_extent_buffer(c);
+ path->nodes[level] = next;
+ path->slots[level] = 0;
+ if (level == path->lowest_level)
+ break;
+ next = read_node_slot(fs_info, next, 0);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
+ }
+ return 0;
+}
+
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+
+ while(1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (nritems == 0)
+ return 1;
+ if (path->slots[0] == nritems)
+ path->slots[0]--;
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid < min_objectid)
+ break;
+ if (found_key.type == type)
+ return 0;
+ if (found_key.objectid == min_objectid &&
+ found_key.type < type)
+ break;
+ }
+ return 1;
+}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e8dcab1a0b5d..1fe7a4544022 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -51,6 +51,15 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(fs_info) \
(__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
+
+struct btrfs_path {
+ struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
+ int slots[BTRFS_MAX_LEVEL];
+
+ /* keep some upper locks as we walk down */
+ u8 lowest_level;
+};
+
/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
@@ -85,6 +94,7 @@ struct btrfs_root {
struct rb_node rb_node;
};
+struct btrfs_trans_handle;
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
@@ -1206,7 +1216,7 @@ struct __btrfs_root {
int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
+int __btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void __btrfs_free_path(struct __btrfs_path *);
int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
struct __btrfs_path *);
@@ -1272,5 +1282,54 @@ btrfs_check_node(struct btrfs_fs_info *fs_info,
enum btrfs_tree_block_status
btrfs_check_leaf(struct btrfs_fs_info *fs_info,
struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *parent, int slot);
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type);
+int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path);
+/*
+ * Walk up the tree as far as necessary to find the next leaf.
+ *
+ * returns 0 if it found something or 1 if there are no greater leaves.
+ * returns < 0 on io errors.
+ */
+static inline int btrfs_next_leaf(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ path->lowest_level = 0;
+ return btrfs_next_sibling_tree_block(root->fs_info, path);
+}
+
+static inline int btrfs_next_item(struct btrfs_root *root,
+ struct btrfs_path *p)
+{
+ ++p->slots[0];
+ if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
+ return btrfs_next_leaf(root, p);
+ return 0;
+}
+
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(struct extent_buffer *leaf);
+int btrfs_search_slot(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const struct btrfs_key *key,
+ struct btrfs_path *p, int ins_len, int cow);
+int btrfs_search_slot_for_read(struct btrfs_root *root,
+ const struct btrfs_key *key,
+ struct btrfs_path *p, int find_higher,
+ int return_any);
+void btrfs_release_path(struct btrfs_path *p);
+struct btrfs_path *btrfs_alloc_path(void);
+void btrfs_free_path(struct btrfs_path *p);
+static inline void btrfs_init_path(struct btrfs_path *p)
+{
+ memset(p, 0, sizeof(*p));
+}
+int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
+ int *slot);
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key);
#endif /* __BTRFS_CTREE_H__ */
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 13/26] fs: btrfs: Crossport btrfs_search_slot() from btrfs-progs
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
This patch copies the core function, btrfs_search_slot() from
btrfs-progs.
This version has the following function removed:
- The ability to COW tree block
Related code is commented, as we may still need this ability later.
- The readahead functionality
That readahead is abused in kernel. Remove it completely.
With the core function in place, btrfs developers should feel at home now.
This also crossports supportive codes like btrfs_previous_item() to
ctree.[ch].
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.c | 536 ++++++++++++++++++++++++++++++++++++++++++++++-
fs/btrfs/ctree.h | 61 +++++-
2 files changed, 591 insertions(+), 6 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 68f38a97b80e..20c68a154d14 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -5,9 +5,11 @@
* 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
*/
-#include "btrfs.h"
+#include <linux/kernel.h>
#include <malloc.h>
#include <memalign.h>
+#include "btrfs.h"
+#include "disk-io.h"
static const struct btrfs_csum {
u16 size;
@@ -41,6 +43,32 @@ u16 btrfs_csum_type_size(u16 csum_type)
return btrfs_csums[csum_type].size;
}
+struct btrfs_path *btrfs_alloc_path(void)
+{
+ struct btrfs_path *path;
+ path = kzalloc(sizeof(struct btrfs_path), GFP_NOFS);
+ return path;
+}
+
+void btrfs_free_path(struct btrfs_path *p)
+{
+ if (!p)
+ return;
+ btrfs_release_path(p);
+ kfree(p);
+}
+
+void btrfs_release_path(struct btrfs_path *p)
+{
+ int i;
+ for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
+ if (!p->nodes[i])
+ continue;
+ free_extent_buffer(p->nodes[i]);
+ }
+ memset(p, 0, sizeof(*p));
+}
+
int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
{
if (a->objectid > b->objectid)
@@ -71,7 +99,17 @@ int btrfs_comp_keys_type(struct btrfs_key *a, struct btrfs_key *b)
return 0;
}
-static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
+/*
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
+ * the slot in the array is returned via slot, and it points to
+ * the place where you would insert key if it is not found in
+ * the array.
+ *
+ * slot may point to max if the key is bigger than all of the keys
+ */
+static int __generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
int max, int *slot)
{
int low = 0, high = max, mid, ret;
@@ -97,7 +135,7 @@ static int generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
return 1;
}
-int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
+int __btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
int *slot)
{
void *addr;
@@ -111,7 +149,7 @@ int btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
size = sizeof(struct btrfs_item);
}
- return generic_bin_search(addr, size, key, p->header.nritems, slot);
+ return __generic_bin_search(addr, size, key, p->header.nritems, slot);
}
static void clear_path(struct __btrfs_path *p)
@@ -208,7 +246,7 @@ int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
}
prev_lvl = lvl;
- ret = btrfs_bin_search(buf, key, &slot);
+ ret = __btrfs_bin_search(buf, key, &slot);
if (ret < 0)
goto err;
if (ret && slot > 0 && lvl)
@@ -463,6 +501,350 @@ fail:
return ret;
}
+static int noinline check_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path, int level)
+{
+ struct btrfs_disk_key key;
+ struct btrfs_disk_key *key_ptr = NULL;
+ struct extent_buffer *parent;
+ enum btrfs_tree_block_status ret;
+
+ if (path->nodes[level + 1]) {
+ parent = path->nodes[level + 1];
+ btrfs_node_key(parent, &key, path->slots[level + 1]);
+ key_ptr = &key;
+ }
+ if (level == 0)
+ ret = btrfs_check_leaf(fs_info, key_ptr, path->nodes[0]);
+ else
+ ret = btrfs_check_node(fs_info, key_ptr, path->nodes[level]);
+ if (ret == BTRFS_TREE_BLOCK_CLEAN)
+ return 0;
+ return -EIO;
+}
+
+/*
+ * search for key in the extent_buffer. The items start at offset p,
+ * and they are item_size apart. There are 'max' items in p.
+ *
+ * the slot in the array is returned via slot, and it points to
+ * the place where you would insert key if it is not found in
+ * the array.
+ *
+ * slot may point to max if the key is bigger than all of the keys
+ */
+static int generic_bin_search(struct extent_buffer *eb, unsigned long p,
+ int item_size, const struct btrfs_key *key,
+ int max, int *slot)
+{
+ int low = 0;
+ int high = max;
+ int mid;
+ int ret;
+ unsigned long offset;
+ struct btrfs_disk_key *tmp;
+
+ while(low < high) {
+ mid = (low + high) / 2;
+ offset = p + mid * item_size;
+
+ tmp = (struct btrfs_disk_key *)(eb->data + offset);
+ ret = btrfs_comp_keys(tmp, key);
+
+ if (ret < 0)
+ low = mid + 1;
+ else if (ret > 0)
+ high = mid;
+ else {
+ *slot = mid;
+ return 0;
+ }
+ }
+ *slot = low;
+ return 1;
+}
+
+/*
+ * simple bin_search frontend that does the right thing for
+ * leaves vs nodes
+ */
+int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
+ int *slot)
+{
+ if (btrfs_header_level(eb) == 0)
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_leaf, items),
+ sizeof(struct btrfs_item),
+ key, btrfs_header_nritems(eb),
+ slot);
+ else
+ return generic_bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
+ sizeof(struct btrfs_key_ptr),
+ key, btrfs_header_nritems(eb),
+ slot);
+}
+
+struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *parent, int slot)
+{
+ struct extent_buffer *ret;
+ int level = btrfs_header_level(parent);
+
+ if (slot < 0)
+ return NULL;
+ if (slot >= btrfs_header_nritems(parent))
+ return NULL;
+
+ if (level == 0)
+ return NULL;
+
+ ret = read_tree_block(fs_info, btrfs_node_blockptr(parent, slot),
+ btrfs_node_ptr_generation(parent, slot));
+ if (!extent_buffer_uptodate(ret))
+ return ERR_PTR(-EIO);
+
+ if (btrfs_header_level(ret) != level - 1) {
+ error(
+"child eb corrupted: parent bytenr=%llu item=%d parent level=%d child level=%d",
+ btrfs_header_bytenr(parent), slot,
+ btrfs_header_level(parent), btrfs_header_level(ret));
+ free_extent_buffer(ret);
+ return ERR_PTR(-EIO);
+ }
+ return ret;
+}
+
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key)
+{
+ int ret;
+ struct btrfs_key key;
+ struct extent_buffer *eb;
+ struct btrfs_path *path;
+
+ key.type = key_type;
+ key.objectid = iobjectid;
+ key.offset = ioff;
+
+ if (found_path == NULL) {
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ } else
+ path = found_path;
+
+ ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
+ if ((ret < 0) || (found_key == NULL))
+ goto out;
+
+ eb = path->nodes[0];
+ if (ret && path->slots[0] >= btrfs_header_nritems(eb)) {
+ ret = btrfs_next_leaf(fs_root, path);
+ if (ret)
+ goto out;
+ eb = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(eb, found_key, path->slots[0]);
+ if (found_key->type != key.type ||
+ found_key->objectid != key.objectid) {
+ ret = 1;
+ goto out;
+ }
+
+out:
+ if (path != found_path)
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * look for key in the tree. path is filled in with nodes along the way
+ * if key is found, we return zero and you can find the item in the leaf
+ * level of the path (level 0)
+ *
+ * If the key isn't found, the path points to the slot where it should
+ * be inserted, and 1 is returned. If there are other errors during the
+ * search a negative error number is returned.
+ *
+ * if ins_len > 0, nodes and leaves will be split as we walk down the
+ * tree. if ins_len < 0, nodes will be merged as we walk down the tree (if
+ * possible)
+ *
+ * NOTE: This version has no COW ability, thus we expect trans == NULL,
+ * ins_len == 0 and cow == 0.
+ */
+int btrfs_search_slot(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const struct btrfs_key *key,
+ struct btrfs_path *p, int ins_len, int cow)
+{
+ struct extent_buffer *b;
+ int slot;
+ int ret;
+ int level;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ u8 lowest_level = 0;
+
+ assert(trans == NULL && ins_len == 0 && cow == 0);
+ lowest_level = p->lowest_level;
+ WARN_ON(lowest_level && ins_len > 0);
+ WARN_ON(p->nodes[0] != NULL);
+
+ b = root->node;
+ extent_buffer_get(b);
+ while (b) {
+ level = btrfs_header_level(b);
+ /*
+ if (cow) {
+ int wret;
+ wret = btrfs_cow_block(trans, root, b,
+ p->nodes[level + 1],
+ p->slots[level + 1],
+ &b);
+ if (wret) {
+ free_extent_buffer(b);
+ return wret;
+ }
+ }
+ */
+ BUG_ON(!cow && ins_len);
+ if (level != btrfs_header_level(b))
+ WARN_ON(1);
+ level = btrfs_header_level(b);
+ p->nodes[level] = b;
+ ret = check_block(fs_info, p, level);
+ if (ret)
+ return -1;
+ ret = btrfs_bin_search(b, key, &slot);
+ if (level != 0) {
+ if (ret && slot > 0)
+ slot -= 1;
+ p->slots[level] = slot;
+ /*
+ if ((p->search_for_split || ins_len > 0) &&
+ btrfs_header_nritems(b) >=
+ BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 3) {
+ int sret = split_node(trans, root, p, level);
+ BUG_ON(sret > 0);
+ if (sret)
+ return sret;
+ b = p->nodes[level];
+ slot = p->slots[level];
+ } else if (ins_len < 0) {
+ int sret = balance_level(trans, root, p,
+ level);
+ if (sret)
+ return sret;
+ b = p->nodes[level];
+ if (!b) {
+ btrfs_release_path(p);
+ goto again;
+ }
+ slot = p->slots[level];
+ BUG_ON(btrfs_header_nritems(b) == 1);
+ }
+ */
+ /* this is only true while dropping a snapshot */
+ if (level == lowest_level)
+ break;
+
+ b = read_node_slot(fs_info, b, slot);
+ if (!extent_buffer_uptodate(b))
+ return -EIO;
+ } else {
+ p->slots[level] = slot;
+ /*
+ if (ins_len > 0 &&
+ ins_len > btrfs_leaf_free_space(b)) {
+ int sret = split_leaf(trans, root, key,
+ p, ins_len, ret == 0);
+ BUG_ON(sret > 0);
+ if (sret)
+ return sret;
+ }
+ */
+ return ret;
+ }
+ }
+ return 1;
+}
+
+/*
+ * Helper to use instead of search slot if no exact match is needed but
+ * instead the next or previous item should be returned.
+ * When find_higher is true, the next higher item is returned, the next lower
+ * otherwise.
+ * When return_any and find_higher are both true, and no higher item is found,
+ * return the next lower instead.
+ * When return_any is true and find_higher is false, and no lower item is found,
+ * return the next higher instead.
+ * It returns 0 if any item is found, 1 if none is found (tree empty), and
+ * < 0 on error
+ */
+int btrfs_search_slot_for_read(struct btrfs_root *root,
+ const struct btrfs_key *key,
+ struct btrfs_path *p, int find_higher,
+ int return_any)
+{
+ int ret;
+ struct extent_buffer *leaf;
+
+again:
+ ret = btrfs_search_slot(NULL, root, key, p, 0, 0);
+ if (ret <= 0)
+ return ret;
+ /*
+ * A return value of 1 means the path is at the position where the item
+ * should be inserted. Normally this is the next bigger item, but in
+ * case the previous item is the last in a leaf, path points to the
+ * first free slot in the previous leaf, i.e.@an invalid item.
+ */
+ leaf = p->nodes[0];
+
+ if (find_higher) {
+ if (p->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, p);
+ if (ret <= 0)
+ return ret;
+ if (!return_any)
+ return 1;
+ /*
+ * No higher item found, return the next lower instead
+ */
+ return_any = 0;
+ find_higher = 0;
+ btrfs_release_path(p);
+ goto again;
+ }
+ } else {
+ if (p->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, p);
+ if (ret < 0)
+ return ret;
+ if (!ret) {
+ leaf = p->nodes[0];
+ if (p->slots[0] == btrfs_header_nritems(leaf))
+ p->slots[0]--;
+ return 0;
+ }
+ if (!return_any)
+ return 1;
+ /*
+ * No lower item found, return the next higher instead
+ */
+ return_any = 0;
+ find_higher = 1;
+ btrfs_release_path(p);
+ goto again;
+ } else {
+ --p->slots[0];
+ }
+ }
+ return 0;
+}
+
/*
* how many bytes are required to store the items in a leaf. start
* and nr indicate which items in the leaf to check. This totals up the
@@ -504,3 +886,147 @@ int btrfs_leaf_free_space(struct extent_buffer *leaf)
}
return ret;
}
+
+/*
+ * walk up the tree as far as required to find the previous leaf.
+ * returns 0 if it found something or 1 if there are no lesser leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
+{
+ int slot;
+ int level = 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+ struct btrfs_fs_info *fs_info = root->fs_info;
+
+ while(level < BTRFS_MAX_LEVEL) {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level];
+ c = path->nodes[level];
+ if (slot == 0) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
+ continue;
+ }
+ slot--;
+
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ break;
+ }
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ free_extent_buffer(c);
+ slot = btrfs_header_nritems(next);
+ if (slot != 0)
+ slot--;
+ path->nodes[level] = next;
+ path->slots[level] = slot;
+ if (!level)
+ break;
+ next = read_node_slot(fs_info, next, slot);
+ if (!extent_buffer_uptodate(next)) {
+ if (IS_ERR(next))
+ return PTR_ERR(next);
+ return -EIO;
+ }
+ }
+ return 0;
+}
+
+/*
+ * Walk up the tree as far as necessary to find the next sibling tree block.
+ * More generic version of btrfs_next_leaf(), as it could find sibling nodes
+ * if @path->lowest_level is not 0.
+ *
+ * returns 0 if it found something or 1 if there are no greater leaves.
+ * returns < 0 on io errors.
+ */
+int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path)
+{
+ int slot;
+ int level = path->lowest_level + 1;
+ struct extent_buffer *c;
+ struct extent_buffer *next = NULL;
+
+ BUG_ON(path->lowest_level + 1 >= BTRFS_MAX_LEVEL);
+ do {
+ if (!path->nodes[level])
+ return 1;
+
+ slot = path->slots[level] + 1;
+ c = path->nodes[level];
+ if (slot >= btrfs_header_nritems(c)) {
+ level++;
+ if (level == BTRFS_MAX_LEVEL)
+ return 1;
+ continue;
+ }
+
+ next = read_node_slot(fs_info, c, slot);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
+ break;
+ } while (level < BTRFS_MAX_LEVEL);
+ path->slots[level] = slot;
+ while(1) {
+ level--;
+ c = path->nodes[level];
+ free_extent_buffer(c);
+ path->nodes[level] = next;
+ path->slots[level] = 0;
+ if (level == path->lowest_level)
+ break;
+ next = read_node_slot(fs_info, next, 0);
+ if (!extent_buffer_uptodate(next))
+ return -EIO;
+ }
+ return 0;
+}
+
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type)
+{
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+ u32 nritems;
+ int ret;
+
+ while(1) {
+ if (path->slots[0] == 0) {
+ ret = btrfs_prev_leaf(root, path);
+ if (ret != 0)
+ return ret;
+ } else {
+ path->slots[0]--;
+ }
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ if (nritems == 0)
+ return 1;
+ if (path->slots[0] == nritems)
+ path->slots[0]--;
+
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ if (found_key.objectid < min_objectid)
+ break;
+ if (found_key.type == type)
+ return 0;
+ if (found_key.objectid == min_objectid &&
+ found_key.type < type)
+ break;
+ }
+ return 1;
+}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e8dcab1a0b5d..1fe7a4544022 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -51,6 +51,15 @@ static inline unsigned long btrfs_chunk_item_size(int num_stripes)
#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
#define BTRFS_LEAF_DATA_SIZE(fs_info) \
(__BTRFS_LEAF_DATA_SIZE(fs_info->nodesize))
+
+struct btrfs_path {
+ struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
+ int slots[BTRFS_MAX_LEVEL];
+
+ /* keep some upper locks as we walk down */
+ u8 lowest_level;
+};
+
/* ioprio of readahead is set to idle */
#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
@@ -85,6 +94,7 @@ struct btrfs_root {
struct rb_node rb_node;
};
+struct btrfs_trans_handle;
struct btrfs_device;
struct btrfs_fs_devices;
struct btrfs_fs_info {
@@ -1206,7 +1216,7 @@ struct __btrfs_root {
int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
+int __btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
void __btrfs_free_path(struct __btrfs_path *);
int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
struct __btrfs_path *);
@@ -1272,5 +1282,54 @@ btrfs_check_node(struct btrfs_fs_info *fs_info,
enum btrfs_tree_block_status
btrfs_check_leaf(struct btrfs_fs_info *fs_info,
struct btrfs_disk_key *parent_key, struct extent_buffer *buf);
+struct extent_buffer *read_node_slot(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *parent, int slot);
+int btrfs_previous_item(struct btrfs_root *root,
+ struct btrfs_path *path, u64 min_objectid,
+ int type);
+int btrfs_next_sibling_tree_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_path *path);
+/*
+ * Walk up the tree as far as necessary to find the next leaf.
+ *
+ * returns 0 if it found something or 1 if there are no greater leaves.
+ * returns < 0 on io errors.
+ */
+static inline int btrfs_next_leaf(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ path->lowest_level = 0;
+ return btrfs_next_sibling_tree_block(root->fs_info, path);
+}
+
+static inline int btrfs_next_item(struct btrfs_root *root,
+ struct btrfs_path *p)
+{
+ ++p->slots[0];
+ if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
+ return btrfs_next_leaf(root, p);
+ return 0;
+}
+
+int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
int btrfs_leaf_free_space(struct extent_buffer *leaf);
+int btrfs_search_slot(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const struct btrfs_key *key,
+ struct btrfs_path *p, int ins_len, int cow);
+int btrfs_search_slot_for_read(struct btrfs_root *root,
+ const struct btrfs_key *key,
+ struct btrfs_path *p, int find_higher,
+ int return_any);
+void btrfs_release_path(struct btrfs_path *p);
+struct btrfs_path *btrfs_alloc_path(void);
+void btrfs_free_path(struct btrfs_path *p);
+static inline void btrfs_init_path(struct btrfs_path *p)
+{
+ memset(p, 0, sizeof(*p));
+}
+int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key,
+ int *slot);
+int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,
+ u64 iobjectid, u64 ioff, u8 key_type,
+ struct btrfs_key *found_key);
#endif /* __BTRFS_CTREE_H__ */
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 14/26] fs: btrfs: Crossport btrfs_read_sys_array() and btrfs_read_chunk_tree()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
These two functions play a big role in btrfs bootstrap.
The following function is removed:
- Seed device support
Although in theory we can still support multiple devices, we don't have
a facility in U-boot to do device scan without opening them.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 2 +-
fs/btrfs/btrfs.h | 2 +-
fs/btrfs/chunk-map.c | 2 +-
fs/btrfs/volumes.c | 301 +++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 2 +
5 files changed, 306 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 1cb56ea0124d..4f2fa2fe6c9f 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -98,7 +98,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
btrfs_info.chunk_root.objectid = 0;
btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
- if (btrfs_read_chunk_tree()) {
+ if (__btrfs_read_chunk_tree()) {
printf("%s: failed to read chunk tree\n", __func__);
return -1;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 57cdb5aad58c..037492fa06a8 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -33,7 +33,7 @@ int btrfs_devread(u64, int, void *);
u64 btrfs_map_logical_to_physical(u64);
int btrfs_chunk_map_init(void);
void btrfs_chunk_map_exit(void);
-int btrfs_read_chunk_tree(void);
+int __btrfs_read_chunk_tree(void);
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
index 85c3efc63e16..49d8835e14e9 100644
--- a/fs/btrfs/chunk-map.c
+++ b/fs/btrfs/chunk-map.c
@@ -141,7 +141,7 @@ int btrfs_chunk_map_init(void)
return 0;
}
-int btrfs_read_chunk_tree(void)
+int __btrfs_read_chunk_tree(void)
{
struct __btrfs_path path;
struct btrfs_key key, *found_key;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 63853cb2a1dd..56cf7ac8c631 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5,6 +5,7 @@
#include "ctree.h"
#include "disk-io.h"
#include "volumes.h"
+#include "extent-io.h"
const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
[BTRFS_RAID_RAID10] = {
@@ -369,6 +370,14 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
return NULL;
}
+static struct btrfs_device *fill_missing_device(u64 devid)
+{
+ struct btrfs_device *device;
+
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ return device;
+}
+
/*
* slot == -1: SYSTEM chunk
* return -EIO on error, otherwise return 0
@@ -498,6 +507,298 @@ int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
return 0;
}
+/*
+ * Slot is used to verify the chunk item is valid
+ *
+ * For sys chunk in superblock, pass -1 to indicate sys chunk.
+ */
+static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk, int slot)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct map_lookup *map;
+ struct cache_extent *ce;
+ u64 logical;
+ u64 length;
+ u64 devid;
+ u8 uuid[BTRFS_UUID_SIZE];
+ int num_stripes;
+ int ret;
+ int i;
+
+ logical = key->offset;
+ length = btrfs_chunk_length(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ /* Validation check */
+ ret = btrfs_check_chunk_valid(fs_info, leaf, chunk, slot, logical);
+ if (ret) {
+ error("%s checksums match, but it has an invalid chunk, %s",
+ (slot == -1) ? "Superblock" : "Metadata",
+ (slot == -1) ? "try btrfsck --repair -s <superblock> ie, 0,1,2" : "");
+ return ret;
+ }
+
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+
+ /* already mapped? */
+ if (ce && ce->start <= logical && ce->start + ce->size > logical) {
+ return 0;
+ }
+
+ map = kmalloc(btrfs_map_lookup_size(num_stripes), GFP_NOFS);
+ if (!map)
+ return -ENOMEM;
+
+ map->ce.start = logical;
+ map->ce.size = length;
+ map->num_stripes = num_stripes;
+ map->io_width = btrfs_chunk_io_width(leaf, chunk);
+ map->io_align = btrfs_chunk_io_align(leaf, chunk);
+ map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
+ map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ map->type = btrfs_chunk_type(leaf, chunk);
+ map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+
+ for (i = 0; i < num_stripes; i++) {
+ map->stripes[i].physical =
+ btrfs_stripe_offset_nr(leaf, chunk, i);
+ devid = btrfs_stripe_devid_nr(leaf, chunk, i);
+ read_extent_buffer(leaf, uuid, (unsigned long)
+ btrfs_stripe_dev_uuid_nr(chunk, i),
+ BTRFS_UUID_SIZE);
+ map->stripes[i].dev = btrfs_find_device(fs_info, devid, uuid,
+ NULL);
+ if (!map->stripes[i].dev) {
+ map->stripes[i].dev = fill_missing_device(devid);
+ printf("warning, device %llu is missing\n",
+ (unsigned long long)devid);
+ list_add(&map->stripes[i].dev->dev_list,
+ &fs_info->fs_devices->devices);
+ }
+
+ }
+ ret = insert_cache_extent(&map_tree->cache_tree, &map->ce);
+ if (ret < 0) {
+ errno = -ret;
+ error("failed to add chunk map start=%llu len=%llu: %d (%m)",
+ map->ce.start, map->ce.size, ret);
+ }
+
+ return ret;
+}
+
+static int fill_device_from_item(struct extent_buffer *leaf,
+ struct btrfs_dev_item *dev_item,
+ struct btrfs_device *device)
+{
+ unsigned long ptr;
+
+ device->devid = btrfs_device_id(leaf, dev_item);
+ device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
+ device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
+ device->type = btrfs_device_type(leaf, dev_item);
+ device->io_align = btrfs_device_io_align(leaf, dev_item);
+ device->io_width = btrfs_device_io_width(leaf, dev_item);
+ device->sector_size = btrfs_device_sector_size(leaf, dev_item);
+
+ ptr = (unsigned long)btrfs_device_uuid(dev_item);
+ read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
+
+ return 0;
+}
+
+static int read_one_dev(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_dev_item *dev_item)
+{
+ struct btrfs_device *device;
+ u64 devid;
+ int ret = 0;
+ u8 fs_uuid[BTRFS_UUID_SIZE];
+ u8 dev_uuid[BTRFS_UUID_SIZE];
+
+ devid = btrfs_device_id(leaf, dev_item);
+ read_extent_buffer(leaf, dev_uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ read_extent_buffer(leaf, fs_uuid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_FSID_SIZE);
+
+ if (memcmp(fs_uuid, fs_info->fs_devices->fsid, BTRFS_UUID_SIZE)) {
+ error("Seed device is not yet supported\n");
+ return -ENOTSUPP;
+ }
+
+ device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device)
+ return -ENOMEM;
+ list_add(&device->dev_list,
+ &fs_info->fs_devices->devices);
+ }
+
+ fill_device_from_item(leaf, dev_item, device);
+ fs_info->fs_devices->total_rw_bytes +=
+ btrfs_device_total_bytes(leaf, dev_item);
+ return ret;
+}
+
+int btrfs_read_sys_array(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *super_copy = fs_info->super_copy;
+ struct extent_buffer *sb;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_chunk *chunk;
+ u8 *array_ptr;
+ unsigned long sb_array_offset;
+ int ret = 0;
+ u32 num_stripes;
+ u32 array_size;
+ u32 len = 0;
+ u32 cur_offset;
+ struct btrfs_key key;
+
+ if (fs_info->nodesize < BTRFS_SUPER_INFO_SIZE) {
+ printf("ERROR: nodesize %u too small to read superblock\n",
+ fs_info->nodesize);
+ return -EINVAL;
+ }
+ sb = alloc_dummy_extent_buffer(fs_info, BTRFS_SUPER_INFO_OFFSET,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!sb)
+ return -ENOMEM;
+ btrfs_set_buffer_uptodate(sb);
+ write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy));
+ array_size = btrfs_super_sys_array_size(super_copy);
+
+ array_ptr = super_copy->sys_chunk_array;
+ sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);
+ cur_offset = 0;
+
+ while (cur_offset < array_size) {
+ disk_key = (struct btrfs_disk_key *)array_ptr;
+ len = sizeof(*disk_key);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)sb_array_offset;
+ /*
+ * At least one btrfs_chunk with one stripe must be
+ * present, exact stripe count check comes afterwards
+ */
+ len = btrfs_chunk_item_size(1);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ num_stripes = btrfs_chunk_num_stripes(sb, chunk);
+ if (!num_stripes) {
+ printk(
+ "ERROR: invalid number of stripes %u in sys_array at offset %u\n",
+ num_stripes, cur_offset);
+ ret = -EIO;
+ break;
+ }
+
+ len = btrfs_chunk_item_size(num_stripes);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ ret = read_one_chunk(fs_info, &key, sb, chunk, -1);
+ if (ret)
+ break;
+ } else {
+ printk(
+ "ERROR: unexpected item type %u in sys_array at offset %u\n",
+ (u32)key.type, cur_offset);
+ ret = -EIO;
+ break;
+ }
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
+ }
+ free_extent_buffer(sb);
+ return ret;
+
+out_short_read:
+ printk("ERROR: sys_array too short to read %u bytes at offset %u\n",
+ len, cur_offset);
+ free_extent_buffer(sb);
+ return -EIO;
+}
+
+int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_root *root = fs_info->chunk_root;
+ int ret;
+ int slot;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ /*
+ * Read all device items, and then all the chunk items. All
+ * device items are found before any chunk item (their object id
+ * is smaller than the lowest possible object id for a chunk
+ * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
+ */
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.offset = 0;
+ key.type = 0;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto error;
+ while(1) {
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ if (slot >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret == 0)
+ continue;
+ if (ret < 0)
+ goto error;
+ break;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
+ if (found_key.type == BTRFS_DEV_ITEM_KEY) {
+ struct btrfs_dev_item *dev_item;
+ dev_item = btrfs_item_ptr(leaf, slot,
+ struct btrfs_dev_item);
+ ret = read_one_dev(fs_info, leaf, dev_item);
+ if (ret < 0)
+ goto error;
+ } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
+ struct btrfs_chunk *chunk;
+ chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
+ ret = read_one_chunk(fs_info, &found_key, leaf, chunk,
+ slot);
+ if (ret < 0)
+ goto error;
+ }
+ path->slots[0]++;
+ }
+
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ return ret;
+}
+
/*
* Get stripe length from chunk item and its stripe items
*
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 4383b4f9c034..d0c09d831c74 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -182,6 +182,8 @@ static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
return btrfs_next_bg(fs_info, logical, size,
BTRFS_BLOCK_GROUP_SYSTEM);
}
+int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
+int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_close_all_devices(void);
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 14/26] fs: btrfs: Crossport btrfs_read_sys_array() and btrfs_read_chunk_tree()
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
These two functions play a big role in btrfs bootstrap.
The following function is removed:
- Seed device support
Although in theory we can still support multiple devices, we don't have
a facility in U-boot to do device scan without opening them.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 2 +-
fs/btrfs/btrfs.h | 2 +-
fs/btrfs/chunk-map.c | 2 +-
fs/btrfs/volumes.c | 301 +++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/volumes.h | 2 +
5 files changed, 306 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 1cb56ea0124d..4f2fa2fe6c9f 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -98,7 +98,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
btrfs_info.chunk_root.objectid = 0;
btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
- if (btrfs_read_chunk_tree()) {
+ if (__btrfs_read_chunk_tree()) {
printf("%s: failed to read chunk tree\n", __func__);
return -1;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 57cdb5aad58c..037492fa06a8 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -33,7 +33,7 @@ int btrfs_devread(u64, int, void *);
u64 btrfs_map_logical_to_physical(u64);
int btrfs_chunk_map_init(void);
void btrfs_chunk_map_exit(void);
-int btrfs_read_chunk_tree(void);
+int __btrfs_read_chunk_tree(void);
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
index 85c3efc63e16..49d8835e14e9 100644
--- a/fs/btrfs/chunk-map.c
+++ b/fs/btrfs/chunk-map.c
@@ -141,7 +141,7 @@ int btrfs_chunk_map_init(void)
return 0;
}
-int btrfs_read_chunk_tree(void)
+int __btrfs_read_chunk_tree(void)
{
struct __btrfs_path path;
struct btrfs_key key, *found_key;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 63853cb2a1dd..56cf7ac8c631 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5,6 +5,7 @@
#include "ctree.h"
#include "disk-io.h"
#include "volumes.h"
+#include "extent-io.h"
const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
[BTRFS_RAID_RAID10] = {
@@ -369,6 +370,14 @@ struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
return NULL;
}
+static struct btrfs_device *fill_missing_device(u64 devid)
+{
+ struct btrfs_device *device;
+
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ return device;
+}
+
/*
* slot == -1: SYSTEM chunk
* return -EIO on error, otherwise return 0
@@ -498,6 +507,298 @@ int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
return 0;
}
+/*
+ * Slot is used to verify the chunk item is valid
+ *
+ * For sys chunk in superblock, pass -1 to indicate sys chunk.
+ */
+static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk, int slot)
+{
+ struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
+ struct map_lookup *map;
+ struct cache_extent *ce;
+ u64 logical;
+ u64 length;
+ u64 devid;
+ u8 uuid[BTRFS_UUID_SIZE];
+ int num_stripes;
+ int ret;
+ int i;
+
+ logical = key->offset;
+ length = btrfs_chunk_length(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ /* Validation check */
+ ret = btrfs_check_chunk_valid(fs_info, leaf, chunk, slot, logical);
+ if (ret) {
+ error("%s checksums match, but it has an invalid chunk, %s",
+ (slot == -1) ? "Superblock" : "Metadata",
+ (slot == -1) ? "try btrfsck --repair -s <superblock> ie, 0,1,2" : "");
+ return ret;
+ }
+
+ ce = search_cache_extent(&map_tree->cache_tree, logical);
+
+ /* already mapped? */
+ if (ce && ce->start <= logical && ce->start + ce->size > logical) {
+ return 0;
+ }
+
+ map = kmalloc(btrfs_map_lookup_size(num_stripes), GFP_NOFS);
+ if (!map)
+ return -ENOMEM;
+
+ map->ce.start = logical;
+ map->ce.size = length;
+ map->num_stripes = num_stripes;
+ map->io_width = btrfs_chunk_io_width(leaf, chunk);
+ map->io_align = btrfs_chunk_io_align(leaf, chunk);
+ map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
+ map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ map->type = btrfs_chunk_type(leaf, chunk);
+ map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+
+ for (i = 0; i < num_stripes; i++) {
+ map->stripes[i].physical =
+ btrfs_stripe_offset_nr(leaf, chunk, i);
+ devid = btrfs_stripe_devid_nr(leaf, chunk, i);
+ read_extent_buffer(leaf, uuid, (unsigned long)
+ btrfs_stripe_dev_uuid_nr(chunk, i),
+ BTRFS_UUID_SIZE);
+ map->stripes[i].dev = btrfs_find_device(fs_info, devid, uuid,
+ NULL);
+ if (!map->stripes[i].dev) {
+ map->stripes[i].dev = fill_missing_device(devid);
+ printf("warning, device %llu is missing\n",
+ (unsigned long long)devid);
+ list_add(&map->stripes[i].dev->dev_list,
+ &fs_info->fs_devices->devices);
+ }
+
+ }
+ ret = insert_cache_extent(&map_tree->cache_tree, &map->ce);
+ if (ret < 0) {
+ errno = -ret;
+ error("failed to add chunk map start=%llu len=%llu: %d (%m)",
+ map->ce.start, map->ce.size, ret);
+ }
+
+ return ret;
+}
+
+static int fill_device_from_item(struct extent_buffer *leaf,
+ struct btrfs_dev_item *dev_item,
+ struct btrfs_device *device)
+{
+ unsigned long ptr;
+
+ device->devid = btrfs_device_id(leaf, dev_item);
+ device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
+ device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
+ device->type = btrfs_device_type(leaf, dev_item);
+ device->io_align = btrfs_device_io_align(leaf, dev_item);
+ device->io_width = btrfs_device_io_width(leaf, dev_item);
+ device->sector_size = btrfs_device_sector_size(leaf, dev_item);
+
+ ptr = (unsigned long)btrfs_device_uuid(dev_item);
+ read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
+
+ return 0;
+}
+
+static int read_one_dev(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_dev_item *dev_item)
+{
+ struct btrfs_device *device;
+ u64 devid;
+ int ret = 0;
+ u8 fs_uuid[BTRFS_UUID_SIZE];
+ u8 dev_uuid[BTRFS_UUID_SIZE];
+
+ devid = btrfs_device_id(leaf, dev_item);
+ read_extent_buffer(leaf, dev_uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ read_extent_buffer(leaf, fs_uuid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_FSID_SIZE);
+
+ if (memcmp(fs_uuid, fs_info->fs_devices->fsid, BTRFS_UUID_SIZE)) {
+ error("Seed device is not yet supported\n");
+ return -ENOTSUPP;
+ }
+
+ device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
+ if (!device) {
+ device = kzalloc(sizeof(*device), GFP_NOFS);
+ if (!device)
+ return -ENOMEM;
+ list_add(&device->dev_list,
+ &fs_info->fs_devices->devices);
+ }
+
+ fill_device_from_item(leaf, dev_item, device);
+ fs_info->fs_devices->total_rw_bytes +=
+ btrfs_device_total_bytes(leaf, dev_item);
+ return ret;
+}
+
+int btrfs_read_sys_array(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *super_copy = fs_info->super_copy;
+ struct extent_buffer *sb;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_chunk *chunk;
+ u8 *array_ptr;
+ unsigned long sb_array_offset;
+ int ret = 0;
+ u32 num_stripes;
+ u32 array_size;
+ u32 len = 0;
+ u32 cur_offset;
+ struct btrfs_key key;
+
+ if (fs_info->nodesize < BTRFS_SUPER_INFO_SIZE) {
+ printf("ERROR: nodesize %u too small to read superblock\n",
+ fs_info->nodesize);
+ return -EINVAL;
+ }
+ sb = alloc_dummy_extent_buffer(fs_info, BTRFS_SUPER_INFO_OFFSET,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!sb)
+ return -ENOMEM;
+ btrfs_set_buffer_uptodate(sb);
+ write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy));
+ array_size = btrfs_super_sys_array_size(super_copy);
+
+ array_ptr = super_copy->sys_chunk_array;
+ sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);
+ cur_offset = 0;
+
+ while (cur_offset < array_size) {
+ disk_key = (struct btrfs_disk_key *)array_ptr;
+ len = sizeof(*disk_key);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)sb_array_offset;
+ /*
+ * At least one btrfs_chunk with one stripe must be
+ * present, exact stripe count check comes afterwards
+ */
+ len = btrfs_chunk_item_size(1);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ num_stripes = btrfs_chunk_num_stripes(sb, chunk);
+ if (!num_stripes) {
+ printk(
+ "ERROR: invalid number of stripes %u in sys_array at offset %u\n",
+ num_stripes, cur_offset);
+ ret = -EIO;
+ break;
+ }
+
+ len = btrfs_chunk_item_size(num_stripes);
+ if (cur_offset + len > array_size)
+ goto out_short_read;
+
+ ret = read_one_chunk(fs_info, &key, sb, chunk, -1);
+ if (ret)
+ break;
+ } else {
+ printk(
+ "ERROR: unexpected item type %u in sys_array at offset %u\n",
+ (u32)key.type, cur_offset);
+ ret = -EIO;
+ break;
+ }
+ array_ptr += len;
+ sb_array_offset += len;
+ cur_offset += len;
+ }
+ free_extent_buffer(sb);
+ return ret;
+
+out_short_read:
+ printk("ERROR: sys_array too short to read %u bytes at offset %u\n",
+ len, cur_offset);
+ free_extent_buffer(sb);
+ return -EIO;
+}
+
+int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_root *root = fs_info->chunk_root;
+ int ret;
+ int slot;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ /*
+ * Read all device items, and then all the chunk items. All
+ * device items are found before any chunk item (their object id
+ * is smaller than the lowest possible object id for a chunk
+ * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
+ */
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.offset = 0;
+ key.type = 0;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto error;
+ while(1) {
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ if (slot >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret == 0)
+ continue;
+ if (ret < 0)
+ goto error;
+ break;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
+ if (found_key.type == BTRFS_DEV_ITEM_KEY) {
+ struct btrfs_dev_item *dev_item;
+ dev_item = btrfs_item_ptr(leaf, slot,
+ struct btrfs_dev_item);
+ ret = read_one_dev(fs_info, leaf, dev_item);
+ if (ret < 0)
+ goto error;
+ } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
+ struct btrfs_chunk *chunk;
+ chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
+ ret = read_one_chunk(fs_info, &found_key, leaf, chunk,
+ slot);
+ if (ret < 0)
+ goto error;
+ }
+ path->slots[0]++;
+ }
+
+ ret = 0;
+error:
+ btrfs_free_path(path);
+ return ret;
+}
+
/*
* Get stripe length from chunk item and its stripe items
*
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 4383b4f9c034..d0c09d831c74 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -182,6 +182,8 @@ static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
return btrfs_next_bg(fs_info, logical, size,
BTRFS_BLOCK_GROUP_SYSTEM);
}
+int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
+int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
void btrfs_close_all_devices(void);
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 15/26] fs: btrfs: Crossport open_ctree_fs_info()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
open_ctree_fs_info() is the main entry point to open a btrfs.
This version is a simplfied version of __open_ctree_fd() of btrfs-progs,
the main differences are:
- Parameters on how to specify a block device
Instead of @fd and @path, uboot uses blk_desc and disk_partition_t.
- Remove open_ctree flags
There will not be multiple open ctree modes in uboot.
Otherwise the function structure are all kept the same.
With open_ctree_fs_info() implemented, also introduce the global
current_fs_info pointer to show the current opened btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 15 +-
fs/btrfs/btrfs.h | 1 +
fs/btrfs/compat.h | 2 +
fs/btrfs/ctree.h | 4 +
fs/btrfs/disk-io.c | 509 +++++++++++++++++++++++++++++++++++++++++--
fs/btrfs/disk-io.h | 19 ++
fs/btrfs/root-tree.c | 47 ++++
8 files changed, 579 insertions(+), 20 deletions(-)
create mode 100644 fs/btrfs/root-tree.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 573bb7514fce..3cf8a716f8c0 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o extent-io.o volumes.o
+ common/rbtree-utils.o extent-cache.o extent-io.o volumes.o root-tree.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 4f2fa2fe6c9f..b86e5cc50b9e 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -13,6 +13,7 @@
#include "disk-io.h"
struct btrfs_info btrfs_info;
+struct btrfs_fs_info *current_fs_info;
static int readdir_callback(const struct __btrfs_root *root,
struct btrfs_dir_item *item)
@@ -79,6 +80,9 @@ static int readdir_callback(const struct __btrfs_root *root,
int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
{
+ struct btrfs_fs_info *fs_info;
+ int ret = -1;
+
btrfs_blk_desc = fs_dev_desc;
btrfs_part_info = fs_partition;
@@ -109,7 +113,12 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
return -1;
}
- return 0;
+ fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
+ if (fs_info) {
+ current_fs_info = fs_info;
+ ret = 0;
+ }
+ return ret;
}
int btrfs_ls(const char *path)
@@ -213,6 +222,10 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
void btrfs_close(void)
{
btrfs_chunk_map_exit();
+ if (current_fs_info) {
+ close_ctree_fs_info(current_fs_info);
+ current_fs_info = NULL;
+ }
}
int btrfs_uuid(char *uuid_str)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 037492fa06a8..3d20d2bf06bb 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -22,6 +22,7 @@ struct btrfs_info {
};
extern struct btrfs_info btrfs_info;
+extern struct btrfs_fs_info *current_fs_info;
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 8840e509f32c..64c343f4169c 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -12,6 +12,8 @@
/* A simple wraper to for error() from btrfs-progs */
#define error(...) { printf(__VA_ARGS__); printf("\n"); }
+#define ASSERT(c) assert(c)
+
#define BTRFS_UUID_UNPARSED_SIZE 37
/*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1fe7a4544022..8699cef689ef 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1274,6 +1274,10 @@ const char *btrfs_super_csum_name(u16 csum_type);
u16 btrfs_csum_type_size(u16 csum_type);
size_t btrfs_super_num_csums(void);
+/* root-tree.c */
+int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
+ struct btrfs_root_item *item, struct btrfs_key *key);
+
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
enum btrfs_tree_block_status
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9c5021ce2861..8dc816f7a8c9 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4,6 +4,7 @@
#include <uuid.h>
#include <memalign.h>
#include "kernel-shared/btrfs_tree.h"
+#include "common/rbtree-utils.h"
#include "disk-io.h"
#include "ctree.h"
#include "btrfs.h"
@@ -424,24 +425,6 @@ out:
}
-int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
-{
- int ret;
-
- ret = extent_buffer_uptodate(buf);
- if (!ret)
- return ret;
-
- ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
- parent_transid, 1);
- return !ret;
-}
-
-int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
-{
- return set_extent_buffer_uptodate(eb);
-}
-
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
{
unsigned long offset = 0;
@@ -581,3 +564,493 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
free_extent_buffer(eb);
return ERR_PTR(ret);
}
+
+void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid)
+{
+ root->node = NULL;
+ root->track_dirty = 0;
+
+ root->fs_info = fs_info;
+ root->objectid = objectid;
+ root->last_trans = 0;
+ root->last_inode_alloc = 0;
+
+ memset(&root->root_key, 0, sizeof(root->root_key));
+ memset(&root->root_item, 0, sizeof(root->root_item));
+ root->root_key.objectid = objectid;
+}
+
+static int find_and_setup_root(struct btrfs_root *tree_root,
+ struct btrfs_fs_info *fs_info,
+ u64 objectid, struct btrfs_root *root)
+{
+ int ret;
+ u64 generation;
+
+ btrfs_setup_root(root, fs_info, objectid);
+ ret = btrfs_find_last_root(tree_root, objectid,
+ &root->root_item, &root->root_key);
+ if (ret)
+ return ret;
+
+ generation = btrfs_root_generation(&root->root_item);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
+ if (!extent_buffer_uptodate(root->node))
+ return -EIO;
+
+ return 0;
+}
+
+int btrfs_free_fs_root(struct btrfs_root *root)
+{
+ if (root->node)
+ free_extent_buffer(root->node);
+ kfree(root);
+ return 0;
+}
+
+static void __free_fs_root(struct rb_node *node)
+{
+ struct btrfs_root *root;
+
+ root = container_of(node, struct btrfs_root, rb_node);
+ btrfs_free_fs_root(root);
+}
+
+FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
+
+struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_path *path;
+ struct extent_buffer *l;
+ u64 generation;
+ int ret = 0;
+
+ root = calloc(1, sizeof(*root));
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+ if (location->offset == (u64)-1) {
+ ret = find_and_setup_root(tree_root, fs_info,
+ location->objectid, root);
+ if (ret) {
+ free(root);
+ return ERR_PTR(ret);
+ }
+ goto insert;
+ }
+
+ btrfs_setup_root(root, fs_info,
+ location->objectid);
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ free(root);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
+ if (ret != 0) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto out;
+ }
+ l = path->nodes[0];
+ read_extent_buffer(l, &root->root_item,
+ btrfs_item_ptr_offset(l, path->slots[0]),
+ sizeof(root->root_item));
+ memcpy(&root->root_key, location, sizeof(*location));
+
+ /* If this root is already an orphan, no need to read */
+ if (btrfs_root_refs(&root->root_item) == 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ ret = 0;
+out:
+ btrfs_free_path(path);
+ if (ret) {
+ free(root);
+ return ERR_PTR(ret);
+ }
+ generation = btrfs_root_generation(&root->root_item);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
+ if (!extent_buffer_uptodate(root->node)) {
+ free(root);
+ return ERR_PTR(-EIO);
+ }
+insert:
+ root->ref_cows = 1;
+ return root;
+}
+
+static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
+ void *data)
+{
+ u64 objectid = *((u64 *)data);
+ struct btrfs_root *root;
+
+ root = rb_entry(node, struct btrfs_root, rb_node);
+ if (objectid > root->objectid)
+ return 1;
+ else if (objectid < root->objectid)
+ return -1;
+ else
+ return 0;
+}
+
+int btrfs_fs_roots_compare_roots(struct rb_node *node1, struct rb_node *node2)
+{
+ struct btrfs_root *root;
+
+ root = rb_entry(node2, struct btrfs_root, rb_node);
+ return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
+}
+
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct rb_node *node;
+ int ret;
+ u64 objectid = location->objectid;
+
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return fs_info->tree_root;
+ if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
+ return fs_info->chunk_root;
+ if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
+ return fs_info->csum_root;
+ BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
+ location->offset != (u64)-1);
+
+ node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
+ btrfs_fs_roots_compare_objectids, NULL);
+ if (node)
+ return container_of(node, struct btrfs_root, rb_node);
+
+ root = btrfs_read_fs_root_no_cache(fs_info, location);
+ if (IS_ERR(root))
+ return root;
+
+ ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
+ btrfs_fs_roots_compare_roots);
+ BUG_ON(ret);
+ return root;
+}
+
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
+{
+ free(fs_info->tree_root);
+ free(fs_info->chunk_root);
+ free(fs_info->csum_root);
+ free(fs_info->super_copy);
+ free(fs_info);
+}
+
+struct btrfs_fs_info *btrfs_new_fs_info(void)
+{
+ struct btrfs_fs_info *fs_info;
+
+ fs_info = calloc(1, sizeof(struct btrfs_fs_info));
+ if (!fs_info)
+ return NULL;
+
+ fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
+
+ if (!fs_info->tree_root || !fs_info->chunk_root ||
+ !fs_info->csum_root || !fs_info->super_copy)
+ goto free_all;
+
+ extent_io_tree_init(&fs_info->extent_cache);
+
+ fs_info->fs_root_tree = RB_ROOT;
+ cache_tree_init(&fs_info->mapping_tree.cache_tree);
+
+ mutex_init(&fs_info->fs_mutex);
+
+ return fs_info;
+free_all:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
+}
+
+static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *info_root,
+ u64 objectid, char *str)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ int ret;
+
+ ret = find_and_setup_root(root, fs_info, objectid, info_root);
+ if (ret) {
+ error("could not setup %s tree", str);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ struct btrfs_root *root;
+ struct btrfs_key key;
+ u64 root_tree_bytenr;
+ u64 generation;
+ int ret;
+
+ root = fs_info->tree_root;
+ btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ generation = btrfs_super_generation(sb);
+
+ root_tree_bytenr = btrfs_super_root(sb);
+
+ root->node = read_tree_block(fs_info, root_tree_bytenr, generation);
+ if (!extent_buffer_uptodate(root->node)) {
+ fprintf(stderr, "Couldn't read tree root\n");
+ return -EIO;
+ }
+
+ ret = setup_root_or_create_block(fs_info, fs_info->csum_root,
+ BTRFS_CSUM_TREE_OBJECTID, "csum");
+ if (ret)
+ return ret;
+ fs_info->csum_root->track_dirty = 1;
+
+ fs_info->last_trans_committed = generation;
+
+ key.objectid = BTRFS_FS_TREE_OBJECTID;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
+
+ if (IS_ERR(fs_info->fs_root))
+ return -EIO;
+ return 0;
+}
+
+void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
+{
+ if (fs_info->csum_root)
+ free_extent_buffer(fs_info->csum_root->node);
+ if (fs_info->tree_root)
+ free_extent_buffer(fs_info->tree_root->node);
+ if (fs_info->chunk_root)
+ free_extent_buffer(fs_info->chunk_root->node);
+}
+
+static void free_map_lookup(struct cache_extent *ce)
+{
+ struct map_lookup *map;
+
+ map = container_of(ce, struct map_lookup, ce);
+ kfree(map);
+}
+
+FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
+
+void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
+{
+ free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
+ extent_io_tree_cleanup(&fs_info->extent_cache);
+}
+
+static int btrfs_scan_fs_devices(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices)
+{
+ u64 total_devs;
+ int ret;
+
+ if (round_up(BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
+ desc->blksz) > (part->size << desc->log2blksz)) {
+ error("superblock end %u is larger than device size %llu",
+ BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
+ part->size << desc->log2blksz);
+ return -EINVAL;
+ }
+
+ ret = btrfs_scan_one_device(desc, part, fs_devices, &total_devs);
+ if (ret) {
+ fprintf(stderr, "No valid Btrfs found\n");
+ return ret;
+ }
+ return 0;
+}
+
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb)
+{
+ u64 features;
+
+ features = btrfs_super_incompat_flags(sb) &
+ ~BTRFS_FEATURE_INCOMPAT_SUPP;
+ if (features) {
+ printk("couldn't open because of unsupported "
+ "option features (%llx).\n",
+ (unsigned long long)features);
+ return -ENOTSUPP;
+ }
+
+ features = btrfs_super_incompat_flags(sb);
+ if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
+ features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
+ btrfs_set_super_incompat_flags(sb, features);
+ }
+
+ return 0;
+}
+
+static int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ u64 chunk_root_bytenr;
+ u64 generation;
+ int ret;
+
+ btrfs_setup_root(fs_info->chunk_root, fs_info,
+ BTRFS_CHUNK_TREE_OBJECTID);
+
+ ret = btrfs_read_sys_array(fs_info);
+ if (ret)
+ return ret;
+
+ generation = btrfs_super_chunk_root_generation(sb);
+ chunk_root_bytenr = btrfs_super_chunk_root(sb);
+
+ fs_info->chunk_root->node = read_tree_block(fs_info,
+ chunk_root_bytenr,
+ generation);
+ if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
+ error("cannot read chunk root");
+ return -EIO;
+ }
+
+ ret = btrfs_read_chunk_tree(fs_info);
+ if (ret) {
+ fprintf(stderr, "Couldn't read chunk tree\n");
+ return ret;
+ }
+ return 0;
+}
+
+struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc,
+ disk_partition_t *part)
+{
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_fs_devices *fs_devices = NULL;
+ struct extent_buffer *eb;
+ int ret;
+
+ fs_info = btrfs_new_fs_info();
+ if (!fs_info) {
+ fprintf(stderr, "Failed to allocate memory for fs_info\n");
+ return NULL;
+ }
+
+ ret = btrfs_scan_fs_devices(desc, part, &fs_devices);
+ if (ret)
+ goto out;
+
+ fs_info->fs_devices = fs_devices;
+
+ ret = btrfs_open_devices(fs_devices);
+ if (ret)
+ goto out;
+
+ disk_super = fs_info->super_copy;
+ ret = btrfs_read_dev_super(desc, part, disk_super);
+ if (ret) {
+ printk("No valid btrfs found\n");
+ goto out_devices;
+ }
+
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID) {
+ fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
+ goto out_devices;
+ }
+
+ ASSERT(!memcmp(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE));
+ if (btrfs_fs_incompat(fs_info, METADATA_UUID))
+ ASSERT(!memcmp(disk_super->metadata_uuid,
+ fs_devices->metadata_uuid, BTRFS_FSID_SIZE));
+
+ fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
+ fs_info->nodesize = btrfs_super_nodesize(disk_super);
+ fs_info->stripesize = btrfs_super_stripesize(disk_super);
+
+ ret = btrfs_check_fs_compatibility(fs_info->super_copy);
+ if (ret)
+ goto out_devices;
+
+ ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
+ if (ret)
+ goto out_chunk;
+
+ /* Chunk tree root is unable to read, return directly */
+ if (!fs_info->chunk_root)
+ return fs_info;
+
+ eb = fs_info->chunk_root->node;
+ read_extent_buffer(eb, fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(eb),
+ BTRFS_UUID_SIZE);
+
+ ret = btrfs_setup_all_roots(fs_info);
+ if (ret)
+ goto out_chunk;
+
+ return fs_info;
+
+out_chunk:
+ btrfs_release_all_roots(fs_info);
+ btrfs_cleanup_all_caches(fs_info);
+out_devices:
+ btrfs_close_devices(fs_devices);
+out:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
+}
+
+int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
+{
+ int ret;
+ int err = 0;
+
+ free_fs_roots_tree(&fs_info->fs_root_tree);
+
+ btrfs_release_all_roots(fs_info);
+ ret = btrfs_close_devices(fs_info->fs_devices);
+ btrfs_cleanup_all_caches(fs_info);
+ btrfs_free_fs_info(fs_info);
+ if (!err)
+ err = ret;
+ return err;
+}
+
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
+{
+ int ret;
+
+ ret = extent_buffer_uptodate(buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
+ parent_transid, 1);
+ return !ret;
+}
+
+int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
+{
+ return set_extent_buffer_uptodate(eb);
+}
+
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 9d593374c096..d8f6f827550a 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -22,6 +22,25 @@ struct extent_buffer* btrfs_find_create_tree_block(
struct btrfs_fs_info *fs_info, u64 bytenr);
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize);
+struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location);
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location);
+
+void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid);
+
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
+struct btrfs_fs_info *btrfs_new_fs_info(void);
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb);
+int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info);
+void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);
+void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info);
+
+struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc,
+ disk_partition_t *part);
+int close_ctree_fs_info(struct btrfs_fs_info *fs_info);
+
int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
struct btrfs_super_block *sb);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
new file mode 100644
index 000000000000..a39ad72067d7
--- /dev/null
+++ b/fs/btrfs/root-tree.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "ctree.h"
+
+int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
+ struct btrfs_root_item *item, struct btrfs_key *key)
+{
+ struct btrfs_path *path;
+ struct btrfs_key search_key;
+ struct btrfs_key found_key;
+ struct extent_buffer *l;
+ int ret;
+ int slot;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ search_key.objectid = objectid;
+ search_key.type = BTRFS_ROOT_ITEM_KEY;
+ search_key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+ if (path->slots[0] == 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ BUG_ON(ret == 0);
+ l = path->nodes[0];
+ slot = path->slots[0] - 1;
+ btrfs_item_key_to_cpu(l, &found_key, slot);
+ if (found_key.type != BTRFS_ROOT_ITEM_KEY ||
+ found_key.objectid != objectid) {
+ ret = -ENOENT;
+ goto out;
+ }
+ read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
+ sizeof(*item));
+ memcpy(key, &found_key, sizeof(found_key));
+ ret = 0;
+out:
+ btrfs_free_path(path);
+ return ret;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 15/26] fs: btrfs: Crossport open_ctree_fs_info()
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
open_ctree_fs_info() is the main entry point to open a btrfs.
This version is a simplfied version of __open_ctree_fd() of btrfs-progs,
the main differences are:
- Parameters on how to specify a block device
Instead of @fd and @path, uboot uses blk_desc and disk_partition_t.
- Remove open_ctree flags
There will not be multiple open ctree modes in uboot.
Otherwise the function structure are all kept the same.
With open_ctree_fs_info() implemented, also introduce the global
current_fs_info pointer to show the current opened btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 2 +-
fs/btrfs/btrfs.c | 15 +-
fs/btrfs/btrfs.h | 1 +
fs/btrfs/compat.h | 2 +
fs/btrfs/ctree.h | 4 +
fs/btrfs/disk-io.c | 509 +++++++++++++++++++++++++++++++++++++++++--
fs/btrfs/disk-io.h | 19 ++
fs/btrfs/root-tree.c | 47 ++++
8 files changed, 579 insertions(+), 20 deletions(-)
create mode 100644 fs/btrfs/root-tree.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 573bb7514fce..3cf8a716f8c0 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -4,4 +4,4 @@
obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
- common/rbtree-utils.o extent-cache.o extent-io.o volumes.o
+ common/rbtree-utils.o extent-cache.o extent-io.o volumes.o root-tree.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 4f2fa2fe6c9f..b86e5cc50b9e 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -13,6 +13,7 @@
#include "disk-io.h"
struct btrfs_info btrfs_info;
+struct btrfs_fs_info *current_fs_info;
static int readdir_callback(const struct __btrfs_root *root,
struct btrfs_dir_item *item)
@@ -79,6 +80,9 @@ static int readdir_callback(const struct __btrfs_root *root,
int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
{
+ struct btrfs_fs_info *fs_info;
+ int ret = -1;
+
btrfs_blk_desc = fs_dev_desc;
btrfs_part_info = fs_partition;
@@ -109,7 +113,12 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
return -1;
}
- return 0;
+ fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
+ if (fs_info) {
+ current_fs_info = fs_info;
+ ret = 0;
+ }
+ return ret;
}
int btrfs_ls(const char *path)
@@ -213,6 +222,10 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
void btrfs_close(void)
{
btrfs_chunk_map_exit();
+ if (current_fs_info) {
+ close_ctree_fs_info(current_fs_info);
+ current_fs_info = NULL;
+ }
}
int btrfs_uuid(char *uuid_str)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 037492fa06a8..3d20d2bf06bb 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -22,6 +22,7 @@ struct btrfs_info {
};
extern struct btrfs_info btrfs_info;
+extern struct btrfs_fs_info *current_fs_info;
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 8840e509f32c..64c343f4169c 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -12,6 +12,8 @@
/* A simple wraper to for error() from btrfs-progs */
#define error(...) { printf(__VA_ARGS__); printf("\n"); }
+#define ASSERT(c) assert(c)
+
#define BTRFS_UUID_UNPARSED_SIZE 37
/*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1fe7a4544022..8699cef689ef 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1274,6 +1274,10 @@ const char *btrfs_super_csum_name(u16 csum_type);
u16 btrfs_csum_type_size(u16 csum_type);
size_t btrfs_super_num_csums(void);
+/* root-tree.c */
+int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
+ struct btrfs_root_item *item, struct btrfs_key *key);
+
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
enum btrfs_tree_block_status
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9c5021ce2861..8dc816f7a8c9 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4,6 +4,7 @@
#include <uuid.h>
#include <memalign.h>
#include "kernel-shared/btrfs_tree.h"
+#include "common/rbtree-utils.h"
#include "disk-io.h"
#include "ctree.h"
#include "btrfs.h"
@@ -424,24 +425,6 @@ out:
}
-int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
-{
- int ret;
-
- ret = extent_buffer_uptodate(buf);
- if (!ret)
- return ret;
-
- ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
- parent_transid, 1);
- return !ret;
-}
-
-int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
-{
- return set_extent_buffer_uptodate(eb);
-}
-
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
{
unsigned long offset = 0;
@@ -581,3 +564,493 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
free_extent_buffer(eb);
return ERR_PTR(ret);
}
+
+void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid)
+{
+ root->node = NULL;
+ root->track_dirty = 0;
+
+ root->fs_info = fs_info;
+ root->objectid = objectid;
+ root->last_trans = 0;
+ root->last_inode_alloc = 0;
+
+ memset(&root->root_key, 0, sizeof(root->root_key));
+ memset(&root->root_item, 0, sizeof(root->root_item));
+ root->root_key.objectid = objectid;
+}
+
+static int find_and_setup_root(struct btrfs_root *tree_root,
+ struct btrfs_fs_info *fs_info,
+ u64 objectid, struct btrfs_root *root)
+{
+ int ret;
+ u64 generation;
+
+ btrfs_setup_root(root, fs_info, objectid);
+ ret = btrfs_find_last_root(tree_root, objectid,
+ &root->root_item, &root->root_key);
+ if (ret)
+ return ret;
+
+ generation = btrfs_root_generation(&root->root_item);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
+ if (!extent_buffer_uptodate(root->node))
+ return -EIO;
+
+ return 0;
+}
+
+int btrfs_free_fs_root(struct btrfs_root *root)
+{
+ if (root->node)
+ free_extent_buffer(root->node);
+ kfree(root);
+ return 0;
+}
+
+static void __free_fs_root(struct rb_node *node)
+{
+ struct btrfs_root *root;
+
+ root = container_of(node, struct btrfs_root, rb_node);
+ btrfs_free_fs_root(root);
+}
+
+FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
+
+struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct btrfs_root *tree_root = fs_info->tree_root;
+ struct btrfs_path *path;
+ struct extent_buffer *l;
+ u64 generation;
+ int ret = 0;
+
+ root = calloc(1, sizeof(*root));
+ if (!root)
+ return ERR_PTR(-ENOMEM);
+ if (location->offset == (u64)-1) {
+ ret = find_and_setup_root(tree_root, fs_info,
+ location->objectid, root);
+ if (ret) {
+ free(root);
+ return ERR_PTR(ret);
+ }
+ goto insert;
+ }
+
+ btrfs_setup_root(root, fs_info,
+ location->objectid);
+
+ path = btrfs_alloc_path();
+ if (!path) {
+ free(root);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
+ if (ret != 0) {
+ if (ret > 0)
+ ret = -ENOENT;
+ goto out;
+ }
+ l = path->nodes[0];
+ read_extent_buffer(l, &root->root_item,
+ btrfs_item_ptr_offset(l, path->slots[0]),
+ sizeof(root->root_item));
+ memcpy(&root->root_key, location, sizeof(*location));
+
+ /* If this root is already an orphan, no need to read */
+ if (btrfs_root_refs(&root->root_item) == 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ ret = 0;
+out:
+ btrfs_free_path(path);
+ if (ret) {
+ free(root);
+ return ERR_PTR(ret);
+ }
+ generation = btrfs_root_generation(&root->root_item);
+ root->node = read_tree_block(fs_info,
+ btrfs_root_bytenr(&root->root_item), generation);
+ if (!extent_buffer_uptodate(root->node)) {
+ free(root);
+ return ERR_PTR(-EIO);
+ }
+insert:
+ root->ref_cows = 1;
+ return root;
+}
+
+static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
+ void *data)
+{
+ u64 objectid = *((u64 *)data);
+ struct btrfs_root *root;
+
+ root = rb_entry(node, struct btrfs_root, rb_node);
+ if (objectid > root->objectid)
+ return 1;
+ else if (objectid < root->objectid)
+ return -1;
+ else
+ return 0;
+}
+
+int btrfs_fs_roots_compare_roots(struct rb_node *node1, struct rb_node *node2)
+{
+ struct btrfs_root *root;
+
+ root = rb_entry(node2, struct btrfs_root, rb_node);
+ return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
+}
+
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct rb_node *node;
+ int ret;
+ u64 objectid = location->objectid;
+
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return fs_info->tree_root;
+ if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
+ return fs_info->chunk_root;
+ if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
+ return fs_info->csum_root;
+ BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
+ location->offset != (u64)-1);
+
+ node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
+ btrfs_fs_roots_compare_objectids, NULL);
+ if (node)
+ return container_of(node, struct btrfs_root, rb_node);
+
+ root = btrfs_read_fs_root_no_cache(fs_info, location);
+ if (IS_ERR(root))
+ return root;
+
+ ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
+ btrfs_fs_roots_compare_roots);
+ BUG_ON(ret);
+ return root;
+}
+
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
+{
+ free(fs_info->tree_root);
+ free(fs_info->chunk_root);
+ free(fs_info->csum_root);
+ free(fs_info->super_copy);
+ free(fs_info);
+}
+
+struct btrfs_fs_info *btrfs_new_fs_info(void)
+{
+ struct btrfs_fs_info *fs_info;
+
+ fs_info = calloc(1, sizeof(struct btrfs_fs_info));
+ if (!fs_info)
+ return NULL;
+
+ fs_info->tree_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->csum_root = calloc(1, sizeof(struct btrfs_root));
+ fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
+
+ if (!fs_info->tree_root || !fs_info->chunk_root ||
+ !fs_info->csum_root || !fs_info->super_copy)
+ goto free_all;
+
+ extent_io_tree_init(&fs_info->extent_cache);
+
+ fs_info->fs_root_tree = RB_ROOT;
+ cache_tree_init(&fs_info->mapping_tree.cache_tree);
+
+ mutex_init(&fs_info->fs_mutex);
+
+ return fs_info;
+free_all:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
+}
+
+static int setup_root_or_create_block(struct btrfs_fs_info *fs_info,
+ struct btrfs_root *info_root,
+ u64 objectid, char *str)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ int ret;
+
+ ret = find_and_setup_root(root, fs_info, objectid, info_root);
+ if (ret) {
+ error("could not setup %s tree", str);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ struct btrfs_root *root;
+ struct btrfs_key key;
+ u64 root_tree_bytenr;
+ u64 generation;
+ int ret;
+
+ root = fs_info->tree_root;
+ btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
+ generation = btrfs_super_generation(sb);
+
+ root_tree_bytenr = btrfs_super_root(sb);
+
+ root->node = read_tree_block(fs_info, root_tree_bytenr, generation);
+ if (!extent_buffer_uptodate(root->node)) {
+ fprintf(stderr, "Couldn't read tree root\n");
+ return -EIO;
+ }
+
+ ret = setup_root_or_create_block(fs_info, fs_info->csum_root,
+ BTRFS_CSUM_TREE_OBJECTID, "csum");
+ if (ret)
+ return ret;
+ fs_info->csum_root->track_dirty = 1;
+
+ fs_info->last_trans_committed = generation;
+
+ key.objectid = BTRFS_FS_TREE_OBJECTID;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
+
+ if (IS_ERR(fs_info->fs_root))
+ return -EIO;
+ return 0;
+}
+
+void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
+{
+ if (fs_info->csum_root)
+ free_extent_buffer(fs_info->csum_root->node);
+ if (fs_info->tree_root)
+ free_extent_buffer(fs_info->tree_root->node);
+ if (fs_info->chunk_root)
+ free_extent_buffer(fs_info->chunk_root->node);
+}
+
+static void free_map_lookup(struct cache_extent *ce)
+{
+ struct map_lookup *map;
+
+ map = container_of(ce, struct map_lookup, ce);
+ kfree(map);
+}
+
+FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
+
+void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
+{
+ free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
+ extent_io_tree_cleanup(&fs_info->extent_cache);
+}
+
+static int btrfs_scan_fs_devices(struct blk_desc *desc, disk_partition_t *part,
+ struct btrfs_fs_devices **fs_devices)
+{
+ u64 total_devs;
+ int ret;
+
+ if (round_up(BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
+ desc->blksz) > (part->size << desc->log2blksz)) {
+ error("superblock end %u is larger than device size %llu",
+ BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
+ part->size << desc->log2blksz);
+ return -EINVAL;
+ }
+
+ ret = btrfs_scan_one_device(desc, part, fs_devices, &total_devs);
+ if (ret) {
+ fprintf(stderr, "No valid Btrfs found\n");
+ return ret;
+ }
+ return 0;
+}
+
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb)
+{
+ u64 features;
+
+ features = btrfs_super_incompat_flags(sb) &
+ ~BTRFS_FEATURE_INCOMPAT_SUPP;
+ if (features) {
+ printk("couldn't open because of unsupported "
+ "option features (%llx).\n",
+ (unsigned long long)features);
+ return -ENOTSUPP;
+ }
+
+ features = btrfs_super_incompat_flags(sb);
+ if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
+ features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
+ btrfs_set_super_incompat_flags(sb, features);
+ }
+
+ return 0;
+}
+
+static int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_super_block *sb = fs_info->super_copy;
+ u64 chunk_root_bytenr;
+ u64 generation;
+ int ret;
+
+ btrfs_setup_root(fs_info->chunk_root, fs_info,
+ BTRFS_CHUNK_TREE_OBJECTID);
+
+ ret = btrfs_read_sys_array(fs_info);
+ if (ret)
+ return ret;
+
+ generation = btrfs_super_chunk_root_generation(sb);
+ chunk_root_bytenr = btrfs_super_chunk_root(sb);
+
+ fs_info->chunk_root->node = read_tree_block(fs_info,
+ chunk_root_bytenr,
+ generation);
+ if (!extent_buffer_uptodate(fs_info->chunk_root->node)) {
+ error("cannot read chunk root");
+ return -EIO;
+ }
+
+ ret = btrfs_read_chunk_tree(fs_info);
+ if (ret) {
+ fprintf(stderr, "Couldn't read chunk tree\n");
+ return ret;
+ }
+ return 0;
+}
+
+struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc,
+ disk_partition_t *part)
+{
+ struct btrfs_fs_info *fs_info;
+ struct btrfs_super_block *disk_super;
+ struct btrfs_fs_devices *fs_devices = NULL;
+ struct extent_buffer *eb;
+ int ret;
+
+ fs_info = btrfs_new_fs_info();
+ if (!fs_info) {
+ fprintf(stderr, "Failed to allocate memory for fs_info\n");
+ return NULL;
+ }
+
+ ret = btrfs_scan_fs_devices(desc, part, &fs_devices);
+ if (ret)
+ goto out;
+
+ fs_info->fs_devices = fs_devices;
+
+ ret = btrfs_open_devices(fs_devices);
+ if (ret)
+ goto out;
+
+ disk_super = fs_info->super_copy;
+ ret = btrfs_read_dev_super(desc, part, disk_super);
+ if (ret) {
+ printk("No valid btrfs found\n");
+ goto out_devices;
+ }
+
+ if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID) {
+ fprintf(stderr, "ERROR: Filesystem UUID change in progress\n");
+ goto out_devices;
+ }
+
+ ASSERT(!memcmp(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE));
+ if (btrfs_fs_incompat(fs_info, METADATA_UUID))
+ ASSERT(!memcmp(disk_super->metadata_uuid,
+ fs_devices->metadata_uuid, BTRFS_FSID_SIZE));
+
+ fs_info->sectorsize = btrfs_super_sectorsize(disk_super);
+ fs_info->nodesize = btrfs_super_nodesize(disk_super);
+ fs_info->stripesize = btrfs_super_stripesize(disk_super);
+
+ ret = btrfs_check_fs_compatibility(fs_info->super_copy);
+ if (ret)
+ goto out_devices;
+
+ ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
+ if (ret)
+ goto out_chunk;
+
+ /* Chunk tree root is unable to read, return directly */
+ if (!fs_info->chunk_root)
+ return fs_info;
+
+ eb = fs_info->chunk_root->node;
+ read_extent_buffer(eb, fs_info->chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(eb),
+ BTRFS_UUID_SIZE);
+
+ ret = btrfs_setup_all_roots(fs_info);
+ if (ret)
+ goto out_chunk;
+
+ return fs_info;
+
+out_chunk:
+ btrfs_release_all_roots(fs_info);
+ btrfs_cleanup_all_caches(fs_info);
+out_devices:
+ btrfs_close_devices(fs_devices);
+out:
+ btrfs_free_fs_info(fs_info);
+ return NULL;
+}
+
+int close_ctree_fs_info(struct btrfs_fs_info *fs_info)
+{
+ int ret;
+ int err = 0;
+
+ free_fs_roots_tree(&fs_info->fs_root_tree);
+
+ btrfs_release_all_roots(fs_info);
+ ret = btrfs_close_devices(fs_info->fs_devices);
+ btrfs_cleanup_all_caches(fs_info);
+ btrfs_free_fs_info(fs_info);
+ if (!err)
+ err = ret;
+ return err;
+}
+
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
+{
+ int ret;
+
+ ret = extent_buffer_uptodate(buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&buf->fs_info->extent_cache, buf,
+ parent_transid, 1);
+ return !ret;
+}
+
+int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
+{
+ return set_extent_buffer_uptodate(eb);
+}
+
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 9d593374c096..d8f6f827550a 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -22,6 +22,25 @@ struct extent_buffer* btrfs_find_create_tree_block(
struct btrfs_fs_info *fs_info, u64 bytenr);
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
u64 bytenr, u32 blocksize);
+struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location);
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location);
+
+void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
+ u64 objectid);
+
+void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
+struct btrfs_fs_info *btrfs_new_fs_info(void);
+int btrfs_check_fs_compatibility(struct btrfs_super_block *sb);
+int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info);
+void btrfs_release_all_roots(struct btrfs_fs_info *fs_info);
+void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info);
+
+struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc,
+ disk_partition_t *part);
+int close_ctree_fs_info(struct btrfs_fs_info *fs_info);
+
int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
struct btrfs_super_block *sb);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
new file mode 100644
index 000000000000..a39ad72067d7
--- /dev/null
+++ b/fs/btrfs/root-tree.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "ctree.h"
+
+int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
+ struct btrfs_root_item *item, struct btrfs_key *key)
+{
+ struct btrfs_path *path;
+ struct btrfs_key search_key;
+ struct btrfs_key found_key;
+ struct extent_buffer *l;
+ int ret;
+ int slot;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ search_key.objectid = objectid;
+ search_key.type = BTRFS_ROOT_ITEM_KEY;
+ search_key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+ if (path->slots[0] == 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ BUG_ON(ret == 0);
+ l = path->nodes[0];
+ slot = path->slots[0] - 1;
+ btrfs_item_key_to_cpu(l, &found_key, slot);
+ if (found_key.type != BTRFS_ROOT_ITEM_KEY ||
+ found_key.objectid != objectid) {
+ ret = -ENOENT;
+ goto out;
+ }
+ read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
+ sizeof(*item));
+ memcpy(key, &found_key, sizeof(found_key));
+ ret = 0;
+out:
+ btrfs_free_path(path);
+ return ret;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 16/26] fs: btrfs: Rename path resolve related functions to avoid name conflicts
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:49 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Since the old code are all using __btrfs_path/__btrfs_root other than
the regular extent buffer based one, adding "__" prefix for them to
avoid name conflicts in the incoming cross ports.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 12 ++++++------
fs/btrfs/btrfs.h | 10 +++++-----
fs/btrfs/compat.h | 3 +++
fs/btrfs/ctree.h | 7 +++++++
fs/btrfs/dir-item.c | 12 ++++++------
fs/btrfs/inode.c | 28 ++++++++++++++--------------
fs/btrfs/subvolume.c | 4 ++--
7 files changed, 43 insertions(+), 33 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index b86e5cc50b9e..7e6c7a26e4cf 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -34,7 +34,7 @@ static int readdir_callback(const struct __btrfs_root *root,
char filetime[32], *target = NULL;
time_t mtime;
- if (btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
+ if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
&inode, NULL)) {
printf("%s: Cannot find inode item for directory entry %.*s!\n",
__func__, item->name_len, name);
@@ -48,7 +48,7 @@ static int readdir_callback(const struct __btrfs_root *root,
target = malloc(min(inode.size + 1,
(u64) btrfs_info.sb.sectorsize));
- if (target && btrfs_readlink(root, item->location.objectid,
+ if (target && __btrfs_readlink(root, item->location.objectid,
target)) {
free(target);
target = NULL;
@@ -127,7 +127,7 @@ int btrfs_ls(const char *path)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
+ inr = __btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
if (inr == -1ULL) {
printf("Cannot lookup path %s\n", path);
@@ -153,7 +153,7 @@ int btrfs_exists(const char *file)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
}
@@ -165,7 +165,7 @@ int btrfs_size(const char *file, loff_t *size)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
@@ -190,7 +190,7 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
u64 inr, rd;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 3d20d2bf06bb..e561d27944fc 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -46,7 +46,7 @@ int btrfs_read_superblock(void);
typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
struct btrfs_dir_item *);
-int btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
+int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
@@ -55,12 +55,12 @@ int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
/* inode.c */
-u64 btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
+u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
char *);
-int btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
+int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
struct btrfs_inode_item *, struct __btrfs_root *);
-int btrfs_readlink(const struct __btrfs_root *, u64, char *);
-u64 btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
+int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
+u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 64c343f4169c..535db2685220 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -16,6 +16,9 @@
#define BTRFS_UUID_UNPARSED_SIZE 37
+/* No <linux/limits.h> so have to define it here */
+#define XATTR_NAME_MAX 255
+
/*
* Macros to generate set/get funcs for the struct fields
* assume there is a lefoo_to_cpu for every type, so lets make a simple
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8699cef689ef..f702eaff293c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1278,6 +1278,13 @@ size_t btrfs_super_num_csums(void);
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
struct btrfs_root_item *item, struct btrfs_key *key);
+/* dir-item.c */
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod);
+
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
enum btrfs_tree_block_status
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 756918df2e13..aea621c72bb3 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include "disk-io.h"
-static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
+static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
u16 max_len = BTRFS_NAME_LEN;
u32 end;
@@ -32,7 +32,7 @@ static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
}
static struct btrfs_dir_item *
-btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
+__btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
int name_len)
{
struct btrfs_dir_item *item;
@@ -48,7 +48,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
this_len = sizeof(*item) + item->name_len + item->data_len;
name_ptr = (const char *) (item + 1);
- if (verify_dir_item(item, cur, total_len))
+ if (__verify_dir_item(item, cur, total_len))
return NULL;
if (item->name_len == name_len && !memcmp(name_ptr, name,
name_len))
@@ -61,7 +61,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
return NULL;
}
-int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
+int __btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
@@ -79,7 +79,7 @@ int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
goto out;
- res = btrfs_match_dir_item_name(&path, name, name_len);
+ res = __btrfs_match_dir_item_name(&path, name, name_len);
if (res)
*item = *res;
out:
@@ -110,7 +110,7 @@ int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
item = btrfs_path_item_ptr(&path, struct btrfs_dir_item);
btrfs_dir_item_to_cpu(item);
- if (verify_dir_item(item, 0, sizeof(*item) + item->name_len))
+ if (__verify_dir_item(item, 0, sizeof(*item) + item->name_len))
continue;
if (item->type == BTRFS_FT_XATTR)
continue;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index be385d8a3f98..eb34f546b57f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include <malloc.h>
-u64 btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
+u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
struct __btrfs_path path;
@@ -44,7 +44,7 @@ out:
return res;
}
-int btrfs_lookup_inode(const struct __btrfs_root *root,
+int __btrfs_lookup_inode(const struct __btrfs_root *root,
struct btrfs_key *location,
struct btrfs_inode_item *item,
struct __btrfs_root *new_root)
@@ -83,7 +83,7 @@ out:
return res;
}
-int btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
{
struct __btrfs_path path;
struct btrfs_key key;
@@ -137,7 +137,7 @@ out:
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
-static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
+static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_item *inode_item)
{
struct btrfs_key key;
@@ -164,14 +164,14 @@ static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
return -1ULL;
}
return inr;
}
- res = btrfs_lookup_inode_ref(root, inr, NULL, NULL);
+ res = __btrfs_lookup_inode_ref(root, inr, NULL, NULL);
if (res == -1ULL)
return -1ULL;
@@ -180,7 +180,7 @@ static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
return -1ULL;
}
@@ -209,7 +209,7 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
-u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
+u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
{
@@ -239,7 +239,7 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (len == 2 && cur[0] == '.' && cur[1] == '.') {
cur += 2;
- inr = get_parent_inode(root, inr, &inode_item);
+ inr = __get_parent_inode(root, inr, &inode_item);
if (inr == -1ULL)
return -1ULL;
@@ -250,12 +250,12 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (!*cur)
break;
- if (btrfs_lookup_dir_item(root, inr, cur, len, &item))
+ if (__btrfs_lookup_dir_item(root, inr, cur, len, &item))
return -1ULL;
type = item.type;
have_inode = 1;
- if (btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
+ if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
&inode_item, root))
return -1ULL;
@@ -272,13 +272,13 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (!target)
return -1ULL;
- if (btrfs_readlink(root, item.location.objectid,
+ if (__btrfs_readlink(root, item.location.objectid,
target)) {
free(target);
return -1ULL;
}
- inr = btrfs_lookup_path(root, inr, target, &type,
+ inr = __btrfs_lookup_path(root, inr, target, &type,
&inode_item, symlink_limit - 1);
free(target);
@@ -307,7 +307,7 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, &inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, &inode_item, NULL))
return -1ULL;
}
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index 72b847b940da..0e72577d0df5 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -39,7 +39,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
dir = rref.dirid;
while (dir != BTRFS_FIRST_FREE_OBJECTID) {
- dir = btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
+ dir = __btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
if (dir == -1ULL)
return -1;
@@ -71,7 +71,7 @@ u64 btrfs_get_default_subvol_objectid(void)
{
struct btrfs_dir_item item;
- if (btrfs_lookup_dir_item(&btrfs_info.tree_root,
+ if (__btrfs_lookup_dir_item(&btrfs_info.tree_root,
btrfs_info.sb.root_dir_objectid, "default", 7,
&item))
return BTRFS_FS_TREE_OBJECTID;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 16/26] fs: btrfs: Rename path resolve related functions to avoid name conflicts
@ 2020-04-22 6:49 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:49 UTC (permalink / raw)
To: u-boot
Since the old code are all using __btrfs_path/__btrfs_root other than
the regular extent buffer based one, adding "__" prefix for them to
avoid name conflicts in the incoming cross ports.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 12 ++++++------
fs/btrfs/btrfs.h | 10 +++++-----
fs/btrfs/compat.h | 3 +++
fs/btrfs/ctree.h | 7 +++++++
fs/btrfs/dir-item.c | 12 ++++++------
fs/btrfs/inode.c | 28 ++++++++++++++--------------
fs/btrfs/subvolume.c | 4 ++--
7 files changed, 43 insertions(+), 33 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index b86e5cc50b9e..7e6c7a26e4cf 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -34,7 +34,7 @@ static int readdir_callback(const struct __btrfs_root *root,
char filetime[32], *target = NULL;
time_t mtime;
- if (btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
+ if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
&inode, NULL)) {
printf("%s: Cannot find inode item for directory entry %.*s!\n",
__func__, item->name_len, name);
@@ -48,7 +48,7 @@ static int readdir_callback(const struct __btrfs_root *root,
target = malloc(min(inode.size + 1,
(u64) btrfs_info.sb.sectorsize));
- if (target && btrfs_readlink(root, item->location.objectid,
+ if (target && __btrfs_readlink(root, item->location.objectid,
target)) {
free(target);
target = NULL;
@@ -127,7 +127,7 @@ int btrfs_ls(const char *path)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
+ inr = __btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
if (inr == -1ULL) {
printf("Cannot lookup path %s\n", path);
@@ -153,7 +153,7 @@ int btrfs_exists(const char *file)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
}
@@ -165,7 +165,7 @@ int btrfs_size(const char *file, loff_t *size)
u64 inr;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
@@ -190,7 +190,7 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
u64 inr, rd;
u8 type;
- inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 3d20d2bf06bb..e561d27944fc 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -46,7 +46,7 @@ int btrfs_read_superblock(void);
typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
struct btrfs_dir_item *);
-int btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
+int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
@@ -55,12 +55,12 @@ int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
/* inode.c */
-u64 btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
+u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
char *);
-int btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
+int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
struct btrfs_inode_item *, struct __btrfs_root *);
-int btrfs_readlink(const struct __btrfs_root *, u64, char *);
-u64 btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
+int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
+u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index 64c343f4169c..535db2685220 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -16,6 +16,9 @@
#define BTRFS_UUID_UNPARSED_SIZE 37
+/* No <linux/limits.h> so have to define it here */
+#define XATTR_NAME_MAX 255
+
/*
* Macros to generate set/get funcs for the struct fields
* assume there is a lefoo_to_cpu for every type, so lets make a simple
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8699cef689ef..f702eaff293c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1278,6 +1278,13 @@ size_t btrfs_super_num_csums(void);
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
struct btrfs_root_item *item, struct btrfs_key *key);
+/* dir-item.c */
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod);
+
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
enum btrfs_tree_block_status
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 756918df2e13..aea621c72bb3 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include "disk-io.h"
-static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
+static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
u16 max_len = BTRFS_NAME_LEN;
u32 end;
@@ -32,7 +32,7 @@ static int verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
}
static struct btrfs_dir_item *
-btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
+__btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
int name_len)
{
struct btrfs_dir_item *item;
@@ -48,7 +48,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
this_len = sizeof(*item) + item->name_len + item->data_len;
name_ptr = (const char *) (item + 1);
- if (verify_dir_item(item, cur, total_len))
+ if (__verify_dir_item(item, cur, total_len))
return NULL;
if (item->name_len == name_len && !memcmp(name_ptr, name,
name_len))
@@ -61,7 +61,7 @@ btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
return NULL;
}
-int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
+int __btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
const char *name, int name_len,
struct btrfs_dir_item *item)
{
@@ -79,7 +79,7 @@ int btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
goto out;
- res = btrfs_match_dir_item_name(&path, name, name_len);
+ res = __btrfs_match_dir_item_name(&path, name, name_len);
if (res)
*item = *res;
out:
@@ -110,7 +110,7 @@ int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
item = btrfs_path_item_ptr(&path, struct btrfs_dir_item);
btrfs_dir_item_to_cpu(item);
- if (verify_dir_item(item, 0, sizeof(*item) + item->name_len))
+ if (__verify_dir_item(item, 0, sizeof(*item) + item->name_len))
continue;
if (item->type == BTRFS_FT_XATTR)
continue;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index be385d8a3f98..eb34f546b57f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8,7 +8,7 @@
#include "btrfs.h"
#include <malloc.h>
-u64 btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
+u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
{
struct __btrfs_path path;
@@ -44,7 +44,7 @@ out:
return res;
}
-int btrfs_lookup_inode(const struct __btrfs_root *root,
+int __btrfs_lookup_inode(const struct __btrfs_root *root,
struct btrfs_key *location,
struct btrfs_inode_item *item,
struct __btrfs_root *new_root)
@@ -83,7 +83,7 @@ out:
return res;
}
-int btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
{
struct __btrfs_path path;
struct btrfs_key key;
@@ -137,7 +137,7 @@ out:
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
-static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
+static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_item *inode_item)
{
struct btrfs_key key;
@@ -164,14 +164,14 @@ static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
return -1ULL;
}
return inr;
}
- res = btrfs_lookup_inode_ref(root, inr, NULL, NULL);
+ res = __btrfs_lookup_inode_ref(root, inr, NULL, NULL);
if (res == -1ULL)
return -1ULL;
@@ -180,7 +180,7 @@ static u64 get_parent_inode(struct __btrfs_root *root, u64 inr,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
return -1ULL;
}
@@ -209,7 +209,7 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
-u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
+u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
{
@@ -239,7 +239,7 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (len == 2 && cur[0] == '.' && cur[1] == '.') {
cur += 2;
- inr = get_parent_inode(root, inr, &inode_item);
+ inr = __get_parent_inode(root, inr, &inode_item);
if (inr == -1ULL)
return -1ULL;
@@ -250,12 +250,12 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (!*cur)
break;
- if (btrfs_lookup_dir_item(root, inr, cur, len, &item))
+ if (__btrfs_lookup_dir_item(root, inr, cur, len, &item))
return -1ULL;
type = item.type;
have_inode = 1;
- if (btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
+ if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
&inode_item, root))
return -1ULL;
@@ -272,13 +272,13 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
if (!target)
return -1ULL;
- if (btrfs_readlink(root, item.location.objectid,
+ if (__btrfs_readlink(root, item.location.objectid,
target)) {
free(target);
return -1ULL;
}
- inr = btrfs_lookup_path(root, inr, target, &type,
+ inr = __btrfs_lookup_path(root, inr, target, &type,
&inode_item, symlink_limit - 1);
free(target);
@@ -307,7 +307,7 @@ u64 btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
- if (btrfs_lookup_inode(root, &key, &inode_item, NULL))
+ if (__btrfs_lookup_inode(root, &key, &inode_item, NULL))
return -1ULL;
}
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
index 72b847b940da..0e72577d0df5 100644
--- a/fs/btrfs/subvolume.c
+++ b/fs/btrfs/subvolume.c
@@ -39,7 +39,7 @@ static int get_subvol_name(u64 subvolid, char *name, int max_len)
dir = rref.dirid;
while (dir != BTRFS_FIRST_FREE_OBJECTID) {
- dir = btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
+ dir = __btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
if (dir == -1ULL)
return -1;
@@ -71,7 +71,7 @@ u64 btrfs_get_default_subvol_objectid(void)
{
struct btrfs_dir_item item;
- if (btrfs_lookup_dir_item(&btrfs_info.tree_root,
+ if (__btrfs_lookup_dir_item(&btrfs_info.tree_root,
btrfs_info.sb.root_dir_objectid, "default", 7,
&item))
return BTRFS_FS_TREE_OBJECTID;
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 17/26] fs: btrfs: Use btrfs_readlink() to implement __btrfs_readlink()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
The existing __btrfs_readlink() can be easily re-implemented using the
extent buffer based btrfs_readlink().
This should be the first step to re-implement u-boot btrfs code.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.h | 1 +
fs/btrfs/inode.c | 100 +++++++++++++++++++++++++++++------------------
2 files changed, 64 insertions(+), 37 deletions(-)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index e561d27944fc..9057f2476526 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -60,6 +60,7 @@ u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref
int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
struct btrfs_inode_item *, struct __btrfs_root *);
int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
+int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index eb34f546b57f..df2f6590bb40 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5,8 +5,9 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
-#include "btrfs.h"
#include <malloc.h>
+#include "btrfs.h"
+#include "disk-io.h"
u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
@@ -83,56 +84,81 @@ out:
return res;
}
-int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+/*
+ * Read the content of symlink inode @ino of @root, into @target.
+ *
+ * Return the number of read data.
+ * Return <0 for error.
+ */
+int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target)
{
- struct __btrfs_path path;
+ struct btrfs_path path;
struct btrfs_key key;
- struct btrfs_file_extent_item *extent;
- const char *data_ptr;
- int res = -1;
+ struct btrfs_file_extent_item *fi;
+ int ret;
- key.objectid = inr;
+ key.objectid = ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
+ btrfs_init_path(&path);
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
- if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
- goto out;
-
- extent = btrfs_path_item_ptr(&path, struct btrfs_file_extent_item);
- if (extent->type != BTRFS_FILE_EXTENT_INLINE) {
- printf("%s: Extent for symlink %llu not of INLINE type\n",
- __func__, inr);
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ ret = -ENOENT;
goto out;
}
-
- btrfs_file_extent_item_to_cpu_inl(extent);
-
- if (extent->compression != BTRFS_COMPRESS_NONE) {
- printf("%s: Symlink %llu extent data compressed!\n", __func__,
- inr);
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(path.nodes[0], fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ ret = -EUCLEAN;
+ printf("Extent for symlink %llu must be INLINE type\n", ino);
goto out;
- } else if (extent->encryption != 0) {
- printf("%s: Symlink %llu extent data encrypted!\n", __func__,
- inr);
+ }
+ if (btrfs_file_extent_compression(path.nodes[0], fi) !=
+ BTRFS_COMPRESS_NONE) {
+ ret = -EUCLEAN;
+ printf("Symlink %llu extent data compressed!\n", ino);
goto out;
- } else if (extent->ram_bytes >= btrfs_info.sb.sectorsize) {
- printf("%s: Symlink %llu extent data too long (%llu)!\n",
- __func__, inr, extent->ram_bytes);
+ }
+ if (btrfs_file_extent_ram_bytes(path.nodes[0], fi) >=
+ root->fs_info->sectorsize) {
+ ret = -EUCLEAN;
+ printf("Symlink %llu extent data too large (%llu)!\n",
+ ino, btrfs_file_extent_ram_bytes(path.nodes[0], fi));
goto out;
}
+ read_extent_buffer(path.nodes[0], target,
+ btrfs_file_extent_inline_start(fi),
+ btrfs_file_extent_ram_bytes(path.nodes[0], fi));
+ ret = btrfs_file_extent_ram_bytes(path.nodes[0], fi);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
- data_ptr = (const char *) extent
- + offsetof(struct btrfs_file_extent_item, disk_bytenr);
+int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+{
+ struct btrfs_root *subvolume;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_key key;
+ int ret;
+
+ ASSERT(fs_info);
+ key.objectid = root->objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ subvolume = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(subvolume))
+ return -1;
- memcpy(target, data_ptr, extent->ram_bytes);
- target[extent->ram_bytes] = '\0';
- res = 0;
-out:
- __btrfs_free_path(&path);
- return res;
+ ret = btrfs_readlink(subvolume, inr, target);
+ if (ret < 0)
+ return -1;
+ target[ret] = '\0';
+ return 0;
}
/* inr must be a directory (for regular files with multiple hard links this
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 17/26] fs: btrfs: Use btrfs_readlink() to implement __btrfs_readlink()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
The existing __btrfs_readlink() can be easily re-implemented using the
extent buffer based btrfs_readlink().
This should be the first step to re-implement u-boot btrfs code.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.h | 1 +
fs/btrfs/inode.c | 100 +++++++++++++++++++++++++++++------------------
2 files changed, 64 insertions(+), 37 deletions(-)
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index e561d27944fc..9057f2476526 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -60,6 +60,7 @@ u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref
int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
struct btrfs_inode_item *, struct __btrfs_root *);
int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
+int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index eb34f546b57f..df2f6590bb40 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5,8 +5,9 @@
* 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
*/
-#include "btrfs.h"
#include <malloc.h>
+#include "btrfs.h"
+#include "disk-io.h"
u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
@@ -83,56 +84,81 @@ out:
return res;
}
-int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+/*
+ * Read the content of symlink inode @ino of @root, into @target.
+ *
+ * Return the number of read data.
+ * Return <0 for error.
+ */
+int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target)
{
- struct __btrfs_path path;
+ struct btrfs_path path;
struct btrfs_key key;
- struct btrfs_file_extent_item *extent;
- const char *data_ptr;
- int res = -1;
+ struct btrfs_file_extent_item *fi;
+ int ret;
- key.objectid = inr;
+ key.objectid = ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
+ btrfs_init_path(&path);
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
- if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)))
- goto out;
-
- extent = btrfs_path_item_ptr(&path, struct btrfs_file_extent_item);
- if (extent->type != BTRFS_FILE_EXTENT_INLINE) {
- printf("%s: Extent for symlink %llu not of INLINE type\n",
- __func__, inr);
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ ret = -ENOENT;
goto out;
}
-
- btrfs_file_extent_item_to_cpu_inl(extent);
-
- if (extent->compression != BTRFS_COMPRESS_NONE) {
- printf("%s: Symlink %llu extent data compressed!\n", __func__,
- inr);
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(path.nodes[0], fi) !=
+ BTRFS_FILE_EXTENT_INLINE) {
+ ret = -EUCLEAN;
+ printf("Extent for symlink %llu must be INLINE type\n", ino);
goto out;
- } else if (extent->encryption != 0) {
- printf("%s: Symlink %llu extent data encrypted!\n", __func__,
- inr);
+ }
+ if (btrfs_file_extent_compression(path.nodes[0], fi) !=
+ BTRFS_COMPRESS_NONE) {
+ ret = -EUCLEAN;
+ printf("Symlink %llu extent data compressed!\n", ino);
goto out;
- } else if (extent->ram_bytes >= btrfs_info.sb.sectorsize) {
- printf("%s: Symlink %llu extent data too long (%llu)!\n",
- __func__, inr, extent->ram_bytes);
+ }
+ if (btrfs_file_extent_ram_bytes(path.nodes[0], fi) >=
+ root->fs_info->sectorsize) {
+ ret = -EUCLEAN;
+ printf("Symlink %llu extent data too large (%llu)!\n",
+ ino, btrfs_file_extent_ram_bytes(path.nodes[0], fi));
goto out;
}
+ read_extent_buffer(path.nodes[0], target,
+ btrfs_file_extent_inline_start(fi),
+ btrfs_file_extent_ram_bytes(path.nodes[0], fi));
+ ret = btrfs_file_extent_ram_bytes(path.nodes[0], fi);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
- data_ptr = (const char *) extent
- + offsetof(struct btrfs_file_extent_item, disk_bytenr);
+int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
+{
+ struct btrfs_root *subvolume;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_key key;
+ int ret;
+
+ ASSERT(fs_info);
+ key.objectid = root->objectid;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ subvolume = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(subvolume))
+ return -1;
- memcpy(target, data_ptr, extent->ram_bytes);
- target[extent->ram_bytes] = '\0';
- res = 0;
-out:
- __btrfs_free_path(&path);
- return res;
+ ret = btrfs_readlink(subvolume, inr, target);
+ if (ret < 0)
+ return -1;
+ target[ret] = '\0';
+ return 0;
}
/* inr must be a directory (for regular files with multiple hard links this
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This is the extent buffer based path lookup routine.
To implement this, btrfs_lookup_dir_item() is cross ported from
btrfs-progs, and implement btrfs_lookup_path() from scratch.
Unlike the existing __btrfs_lookup_path(), since btrfs_read_fs_root()
will check whether a root is orphan at read time, there is no need to
check root backref, this make the code a little easier to read.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 4 +
fs/btrfs/dir-item.c | 106 +++++++++++++++++++
fs/btrfs/inode.c | 245 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 355 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f702eaff293c..78f7746d1f32 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1284,6 +1284,10 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path, u64 dir,
const char *name, int name_len,
int mod);
+/* inode.c */
+int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
+ struct btrfs_root **root_ret, u64 *ino_ret,
+ u8 *type_ret, int symlink_limit);
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index aea621c72bb3..4bf45c2fa925 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -8,6 +8,112 @@
#include "btrfs.h"
#include "disk-io.h"
+static int verify_dir_item(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_dir_item *dir_item)
+{
+ u16 namelen = BTRFS_NAME_LEN;
+ u8 type = btrfs_dir_type(leaf, dir_item);
+
+ if (type == BTRFS_FT_XATTR)
+ namelen = XATTR_NAME_MAX;
+
+ if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
+ fprintf(stderr, "invalid dir item name len: %u\n",
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
+ if ((btrfs_dir_data_len(leaf, dir_item) +
+ btrfs_dir_name_len(leaf, dir_item)) >
+ BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
+ fprintf(stderr, "invalid dir item name + data len: %u + %u\n",
+ (unsigned)btrfs_dir_name_len(leaf, dir_item),
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ return 0;
+}
+
+struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
+ struct btrfs_path *path,
+ const char *name, int name_len)
+{
+ struct btrfs_dir_item *dir_item;
+ unsigned long name_ptr;
+ u32 total_len;
+ u32 cur = 0;
+ u32 this_len;
+ struct extent_buffer *leaf;
+
+ leaf = path->nodes[0];
+ dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
+ total_len = btrfs_item_size_nr(leaf, path->slots[0]);
+ if (verify_dir_item(root, leaf, dir_item))
+ return NULL;
+
+ while(cur < total_len) {
+ this_len = sizeof(*dir_item) +
+ btrfs_dir_name_len(leaf, dir_item) +
+ btrfs_dir_data_len(leaf, dir_item);
+ if (this_len > (total_len - cur)) {
+ fprintf(stderr, "invalid dir item size\n");
+ return NULL;
+ }
+
+ name_ptr = (unsigned long)(dir_item + 1);
+
+ if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
+ memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
+ return dir_item;
+
+ cur += this_len;
+ dir_item = (struct btrfs_dir_item *)((char *)dir_item +
+ this_len);
+ }
+ return NULL;
+}
+
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod)
+{
+ int ret;
+ struct btrfs_key key;
+ int ins_len = mod < 0 ? -1 : 0;
+ int cow = mod != 0;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+
+ key.objectid = dir;
+ key.type = BTRFS_DIR_ITEM_KEY;
+
+ key.offset = btrfs_name_hash(name, name_len);
+
+ ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ return NULL;
+ path->slots[0]--;
+ }
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+
+ if (found_key.objectid != dir ||
+ found_key.type != BTRFS_DIR_ITEM_KEY ||
+ found_key.offset != key.offset)
+ return NULL;
+
+ return btrfs_match_dir_item_name(root, path, name, name_len);
+}
+
static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
u16 max_len = BTRFS_NAME_LEN;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index df2f6590bb40..af4f30bbd50c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -161,6 +161,115 @@ int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
return 0;
}
+static int lookup_root_ref(struct btrfs_fs_info *fs_info,
+ u64 rootid, u64 *root_ret, u64 *dir_ret)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ struct btrfs_root_ref *root_ref;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
+
+ btrfs_init_path(&path);
+ key.objectid = rootid;
+ key.type = BTRFS_ROOT_BACKREF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = btrfs_previous_item(root, &path, rootid, BTRFS_ROOT_BACKREF_KEY);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_root_ref);
+ *root_ret = key.offset;
+ *dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
+/*
+ * To get the parent inode of @ino of @root.
+ *
+ * @root_ret and @ino_ret will be filled.
+ *
+ * NOTE: This function is not reliable. It can only get one parent inode.
+ * The get the proper parent inode, we need a full VFS inodes stack to
+ * resolve properly.
+ */
+static int get_parent_inode(struct btrfs_root *root, u64 ino,
+ struct btrfs_root **root_ret, u64 *ino_ret)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
+
+ if (ino == BTRFS_FIRST_FREE_OBJECTID) {
+ u64 parent_root;
+
+ /* It's top level already, no more parent */
+ if (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) {
+ *root_ret = fs_info->fs_root;
+ *ino_ret = BTRFS_FIRST_FREE_OBJECTID;
+ return 0;
+ }
+
+ ret = lookup_root_ref(fs_info, root->root_key.objectid,
+ &parent_root, ino_ret);
+ if (ret < 0)
+ return ret;
+
+ key.objectid = parent_root;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ *root_ret = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(*root_ret))
+ return PTR_ERR(*root_ret);
+
+ return 0;
+ }
+
+ btrfs_init_path(&path);
+ key.objectid = ino;
+ key.type = BTRFS_INODE_REF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = btrfs_previous_item(root, &path, ino, BTRFS_INODE_REF_KEY);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ *root_ret = root;
+ *ino_ret = key.offset;
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
@@ -235,6 +344,142 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
+/*
+ * Resolve one filename of @ino of @root.
+ *
+ * key_ret: The child key (either INODE_ITEM or ROOT_ITEM type)
+ * type_ret: BTRFS_FT_* of the child inode.
+ *
+ * Return 0 with above members filled.
+ * Return <0 for error.
+ */
+static int resolve_one_filename(struct btrfs_root *root, u64 ino,
+ const char *name, int namelen,
+ struct btrfs_key *key_ret, u8 *type_ret)
+{
+ struct btrfs_dir_item *dir_item;
+ struct btrfs_path path;
+ int ret = 0;
+
+ btrfs_init_path(&path);
+
+ dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
+ namelen, 0);
+ if (IS_ERR(dir_item)) {
+ ret = PTR_ERR(dir_item);
+ goto out;
+ }
+
+ btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
+ *type_ret = btrfs_dir_type(path.nodes[0], dir_item);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
+/*
+ * Resolve a full path @filename. The start point is @ino of @root.
+ *
+ * The result will be filled into @root_ret, @ino_ret and @type_ret.
+ */
+int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
+ struct btrfs_root **root_ret, u64 *ino_ret,
+ u8 *type_ret, int symlink_limit)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_root *next_root;
+ struct btrfs_key key;
+ const char *cur = filename;
+ u64 next_ino;
+ u8 next_type;
+ u8 type;
+ int len;
+ int ret = 0;
+
+ /* If the path is absolute path, also search from fs root */
+ if (*cur == '/') {
+ root = fs_info->fs_root;
+ ino = btrfs_root_dirid(&root->root_item);
+ type = BTRFS_FT_DIR;
+ }
+
+ while (*cur != '\0') {
+
+ cur = skip_current_directories(cur);
+ len = next_length(cur);
+ if (len > BTRFS_NAME_LEN) {
+ printf("%s: Name too long at \"%.*s\"\n", __func__,
+ BTRFS_NAME_LEN, cur);
+ return -ENAMETOOLONG;
+ }
+ if (len == 1 && cur[0] == '.')
+ break;
+ /* Go one level up */
+ if (len == 2 && cur[0] == '.' && cur[1] == '.') {
+ ret = get_parent_inode(root, ino, &next_root, &next_ino);
+ if (ret < 0)
+ return ret;
+ root = next_root;
+ ino = next_ino;
+ goto next;
+ }
+ if (!*cur)
+ break;
+
+ ret = resolve_one_filename(root, ino, cur, len, &key, &type);
+ if (ret < 0)
+ return ret;
+ /* Child inode is a subvolume */
+ if (key.type == BTRFS_ROOT_ITEM_KEY) {
+
+ next_root = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(next_root))
+ return PTR_ERR(next_root);
+ root = next_root;
+ ino = btrfs_root_dirid(&root->root_item);
+ goto next;
+ }
+ /* Child inode is a symlink */
+ if (type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
+ char *target;
+
+ if (symlink_limit == 0) {
+ printf("%s: Too much symlinks!\n", __func__);
+ return -EMLINK;
+ }
+ target = malloc(fs_info->sectorsize);
+ if (!target)
+ return -ENOMEM;
+ ret = btrfs_readlink(root, ino, target);
+ if (ret < 0) {
+ free(target);
+ return ret;
+ }
+ target[ret] = '\0';
+
+ ret = btrfs_lookup_path(root, ino, target, &next_root,
+ &next_ino, &next_type,
+ symlink_limit);
+ if (ret < 0)
+ return ret;
+ root = next_root;
+ ino = next_ino;
+ type = next_type;
+ goto next;
+ }
+ /* Child inode is an inode */
+ ino = key.objectid;
+next:
+ cur += len;
+ }
+ if (!ret) {
+ *root_ret = root;
+ *ino_ret = ino;
+ *type_ret = type;
+ }
+ return ret;
+}
+
u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
This is the extent buffer based path lookup routine.
To implement this, btrfs_lookup_dir_item() is cross ported from
btrfs-progs, and implement btrfs_lookup_path() from scratch.
Unlike the existing __btrfs_lookup_path(), since btrfs_read_fs_root()
will check whether a root is orphan at read time, there is no need to
check root backref, this make the code a little easier to read.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 4 +
fs/btrfs/dir-item.c | 106 +++++++++++++++++++
fs/btrfs/inode.c | 245 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 355 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f702eaff293c..78f7746d1f32 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1284,6 +1284,10 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path, u64 dir,
const char *name, int name_len,
int mod);
+/* inode.c */
+int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
+ struct btrfs_root **root_ret, u64 *ino_ret,
+ u8 *type_ret, int symlink_limit);
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index aea621c72bb3..4bf45c2fa925 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -8,6 +8,112 @@
#include "btrfs.h"
#include "disk-io.h"
+static int verify_dir_item(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_dir_item *dir_item)
+{
+ u16 namelen = BTRFS_NAME_LEN;
+ u8 type = btrfs_dir_type(leaf, dir_item);
+
+ if (type == BTRFS_FT_XATTR)
+ namelen = XATTR_NAME_MAX;
+
+ if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
+ fprintf(stderr, "invalid dir item name len: %u\n",
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
+ if ((btrfs_dir_data_len(leaf, dir_item) +
+ btrfs_dir_name_len(leaf, dir_item)) >
+ BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
+ fprintf(stderr, "invalid dir item name + data len: %u + %u\n",
+ (unsigned)btrfs_dir_name_len(leaf, dir_item),
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ return 0;
+}
+
+struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
+ struct btrfs_path *path,
+ const char *name, int name_len)
+{
+ struct btrfs_dir_item *dir_item;
+ unsigned long name_ptr;
+ u32 total_len;
+ u32 cur = 0;
+ u32 this_len;
+ struct extent_buffer *leaf;
+
+ leaf = path->nodes[0];
+ dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
+ total_len = btrfs_item_size_nr(leaf, path->slots[0]);
+ if (verify_dir_item(root, leaf, dir_item))
+ return NULL;
+
+ while(cur < total_len) {
+ this_len = sizeof(*dir_item) +
+ btrfs_dir_name_len(leaf, dir_item) +
+ btrfs_dir_data_len(leaf, dir_item);
+ if (this_len > (total_len - cur)) {
+ fprintf(stderr, "invalid dir item size\n");
+ return NULL;
+ }
+
+ name_ptr = (unsigned long)(dir_item + 1);
+
+ if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
+ memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
+ return dir_item;
+
+ cur += this_len;
+ dir_item = (struct btrfs_dir_item *)((char *)dir_item +
+ this_len);
+ }
+ return NULL;
+}
+
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod)
+{
+ int ret;
+ struct btrfs_key key;
+ int ins_len = mod < 0 ? -1 : 0;
+ int cow = mod != 0;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+
+ key.objectid = dir;
+ key.type = BTRFS_DIR_ITEM_KEY;
+
+ key.offset = btrfs_name_hash(name, name_len);
+
+ ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ return NULL;
+ path->slots[0]--;
+ }
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+
+ if (found_key.objectid != dir ||
+ found_key.type != BTRFS_DIR_ITEM_KEY ||
+ found_key.offset != key.offset)
+ return NULL;
+
+ return btrfs_match_dir_item_name(root, path, name, name_len);
+}
+
static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
{
u16 max_len = BTRFS_NAME_LEN;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index df2f6590bb40..af4f30bbd50c 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -161,6 +161,115 @@ int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
return 0;
}
+static int lookup_root_ref(struct btrfs_fs_info *fs_info,
+ u64 rootid, u64 *root_ret, u64 *dir_ret)
+{
+ struct btrfs_root *root = fs_info->tree_root;
+ struct btrfs_root_ref *root_ref;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
+
+ btrfs_init_path(&path);
+ key.objectid = rootid;
+ key.type = BTRFS_ROOT_BACKREF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = btrfs_previous_item(root, &path, rootid, BTRFS_ROOT_BACKREF_KEY);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_root_ref);
+ *root_ret = key.offset;
+ *dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
+/*
+ * To get the parent inode of @ino of @root.
+ *
+ * @root_ret and @ino_ret will be filled.
+ *
+ * NOTE: This function is not reliable. It can only get one parent inode.
+ * The get the proper parent inode, we need a full VFS inodes stack to
+ * resolve properly.
+ */
+static int get_parent_inode(struct btrfs_root *root, u64 ino,
+ struct btrfs_root **root_ret, u64 *ino_ret)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
+
+ if (ino == BTRFS_FIRST_FREE_OBJECTID) {
+ u64 parent_root;
+
+ /* It's top level already, no more parent */
+ if (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) {
+ *root_ret = fs_info->fs_root;
+ *ino_ret = BTRFS_FIRST_FREE_OBJECTID;
+ return 0;
+ }
+
+ ret = lookup_root_ref(fs_info, root->root_key.objectid,
+ &parent_root, ino_ret);
+ if (ret < 0)
+ return ret;
+
+ key.objectid = parent_root;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+ *root_ret = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(*root_ret))
+ return PTR_ERR(*root_ret);
+
+ return 0;
+ }
+
+ btrfs_init_path(&path);
+ key.objectid = ino;
+ key.type = BTRFS_INODE_REF_KEY;
+ key.offset = (u64)-1;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = btrfs_previous_item(root, &path, ino, BTRFS_INODE_REF_KEY);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ *root_ret = root;
+ *ino_ret = key.offset;
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
/* inr must be a directory (for regular files with multiple hard links this
function returns only one of the parents of the file) */
static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
@@ -235,6 +344,142 @@ static inline const char *skip_current_directories(const char *cur)
return cur;
}
+/*
+ * Resolve one filename of @ino of @root.
+ *
+ * key_ret: The child key (either INODE_ITEM or ROOT_ITEM type)
+ * type_ret: BTRFS_FT_* of the child inode.
+ *
+ * Return 0 with above members filled.
+ * Return <0 for error.
+ */
+static int resolve_one_filename(struct btrfs_root *root, u64 ino,
+ const char *name, int namelen,
+ struct btrfs_key *key_ret, u8 *type_ret)
+{
+ struct btrfs_dir_item *dir_item;
+ struct btrfs_path path;
+ int ret = 0;
+
+ btrfs_init_path(&path);
+
+ dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
+ namelen, 0);
+ if (IS_ERR(dir_item)) {
+ ret = PTR_ERR(dir_item);
+ goto out;
+ }
+
+ btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
+ *type_ret = btrfs_dir_type(path.nodes[0], dir_item);
+out:
+ btrfs_release_path(&path);
+ return ret;
+}
+
+/*
+ * Resolve a full path @filename. The start point is @ino of @root.
+ *
+ * The result will be filled into @root_ret, @ino_ret and @type_ret.
+ */
+int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
+ struct btrfs_root **root_ret, u64 *ino_ret,
+ u8 *type_ret, int symlink_limit)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_root *next_root;
+ struct btrfs_key key;
+ const char *cur = filename;
+ u64 next_ino;
+ u8 next_type;
+ u8 type;
+ int len;
+ int ret = 0;
+
+ /* If the path is absolute path, also search from fs root */
+ if (*cur == '/') {
+ root = fs_info->fs_root;
+ ino = btrfs_root_dirid(&root->root_item);
+ type = BTRFS_FT_DIR;
+ }
+
+ while (*cur != '\0') {
+
+ cur = skip_current_directories(cur);
+ len = next_length(cur);
+ if (len > BTRFS_NAME_LEN) {
+ printf("%s: Name too long at \"%.*s\"\n", __func__,
+ BTRFS_NAME_LEN, cur);
+ return -ENAMETOOLONG;
+ }
+ if (len == 1 && cur[0] == '.')
+ break;
+ /* Go one level up */
+ if (len == 2 && cur[0] == '.' && cur[1] == '.') {
+ ret = get_parent_inode(root, ino, &next_root, &next_ino);
+ if (ret < 0)
+ return ret;
+ root = next_root;
+ ino = next_ino;
+ goto next;
+ }
+ if (!*cur)
+ break;
+
+ ret = resolve_one_filename(root, ino, cur, len, &key, &type);
+ if (ret < 0)
+ return ret;
+ /* Child inode is a subvolume */
+ if (key.type == BTRFS_ROOT_ITEM_KEY) {
+
+ next_root = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(next_root))
+ return PTR_ERR(next_root);
+ root = next_root;
+ ino = btrfs_root_dirid(&root->root_item);
+ goto next;
+ }
+ /* Child inode is a symlink */
+ if (type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
+ char *target;
+
+ if (symlink_limit == 0) {
+ printf("%s: Too much symlinks!\n", __func__);
+ return -EMLINK;
+ }
+ target = malloc(fs_info->sectorsize);
+ if (!target)
+ return -ENOMEM;
+ ret = btrfs_readlink(root, ino, target);
+ if (ret < 0) {
+ free(target);
+ return ret;
+ }
+ target[ret] = '\0';
+
+ ret = btrfs_lookup_path(root, ino, target, &next_root,
+ &next_ino, &next_type,
+ symlink_limit);
+ if (ret < 0)
+ return ret;
+ root = next_root;
+ ino = next_ino;
+ type = next_type;
+ goto next;
+ }
+ /* Child inode is an inode */
+ ino = key.objectid;
+next:
+ cur += len;
+ }
+ if (!ret) {
+ *root_ret = root;
+ *ino_ret = ino;
+ *type_ret = type;
+ }
+ return ret;
+}
+
u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
u8 *type_p, struct btrfs_inode_item *inode_item_p,
int symlink_limit)
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 19/26] fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Use extent buffer based infrastructure to re-implement btrfs_readdir().
Along this rework, some small corner cases fixed:
- Subvolume tree mtime
Mtime of a subvolume tree is recorded in its root item, since there is
no INODE_ITEM for it.
This needs extra search from tree root.
- Output the unknown type
If the DIR_ITEM is corrupted, at least don't try to access the memory
out of bounday.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 157 +++++++++++++++++++++++++++-----------------
fs/btrfs/btrfs.h | 5 --
fs/btrfs/ctree.h | 5 ++
fs/btrfs/dir-item.c | 68 +++++++++++--------
4 files changed, 144 insertions(+), 91 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 7e6c7a26e4cf..e7c7ddcfc551 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -15,67 +15,102 @@
struct btrfs_info btrfs_info;
struct btrfs_fs_info *current_fs_info;
-static int readdir_callback(const struct __btrfs_root *root,
- struct btrfs_dir_item *item)
+static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
+ struct btrfs_dir_item *di)
{
- static const char typestr[BTRFS_FT_MAX][4] = {
- [BTRFS_FT_UNKNOWN] = " ? ",
- [BTRFS_FT_REG_FILE] = " ",
- [BTRFS_FT_DIR] = "DIR",
- [BTRFS_FT_CHRDEV] = "CHR",
- [BTRFS_FT_BLKDEV] = "BLK",
- [BTRFS_FT_FIFO] = "FIF",
- [BTRFS_FT_SOCK] = "SCK",
- [BTRFS_FT_SYMLINK] = "SYM",
- [BTRFS_FT_XATTR] = " ? ",
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_inode_item ii;
+ struct btrfs_key key;
+ static const char* dir_item_str[] = {
+ [BTRFS_FT_REG_FILE] = "FILE",
+ [BTRFS_FT_DIR] = "DIR",
+ [BTRFS_FT_CHRDEV] = "CHRDEV",
+ [BTRFS_FT_BLKDEV] = "BLKDEV",
+ [BTRFS_FT_FIFO] = "FIFO",
+ [BTRFS_FT_SOCK] = "SOCK",
+ [BTRFS_FT_SYMLINK] = "SYMLINK",
+ [BTRFS_FT_XATTR] = "XATTR"
};
- struct btrfs_inode_item inode;
- const char *name = (const char *) (item + 1);
- char filetime[32], *target = NULL;
+ u8 type = btrfs_dir_type(eb, di);
+ char namebuf[BTRFS_NAME_LEN];
+ char *target = NULL;
+ char filetime[32];
time_t mtime;
+ int ret;
- if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
- &inode, NULL)) {
- printf("%s: Cannot find inode item for directory entry %.*s!\n",
- __func__, item->name_len, name);
- return 0;
- }
-
- mtime = inode.mtime.sec;
- ctime_r(&mtime, filetime);
+ btrfs_dir_item_key_to_cpu(eb, di, &key);
- if (item->type == BTRFS_FT_SYMLINK) {
- target = malloc(min(inode.size + 1,
- (u64) btrfs_info.sb.sectorsize));
+ if (key.type == BTRFS_ROOT_ITEM_KEY) {
+ struct btrfs_root *subvol;
- if (target && __btrfs_readlink(root, item->location.objectid,
- target)) {
- free(target);
- target = NULL;
+ /* It's a subvolume, get its mtime from root item */
+ subvol = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(subvol)) {
+ ret = PTR_ERR(subvol);
+ error("Can't find root %llu", key.objectid);
+ return ret;
}
+ mtime = btrfs_stack_timespec_sec(&subvol->root_item.otime);
+ } else {
+ struct btrfs_path path;
+
+ /* It's regular inode, get its mtime from inode item */
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret > 0)
+ ret = -ENOENT;
+ if (ret < 0) {
+ error("Can't find inode %llu", key.objectid);
+ btrfs_release_path(&path);
+ return ret;
+ }
+ read_extent_buffer(path.nodes[0], &ii,
+ btrfs_item_ptr_offset(path.nodes[0], path.slots[0]),
+ sizeof(ii));
+ btrfs_release_path(&path);
+ mtime = btrfs_stack_timespec_sec(&ii.mtime);
+ }
+ ctime_r(&mtime, filetime);
- if (!target)
- printf("%s: Cannot read symlink target!\n", __func__);
+ if (type == BTRFS_FT_SYMLINK) {
+ target = malloc(fs_info->sectorsize);
+ if (!target) {
+ error("Can't alloc memory for symlink %llu",
+ key.objectid);
+ return -ENOMEM;
+ }
+ ret = btrfs_readlink(root, key.objectid, target);
+ if (ret < 0) {
+ error("Failed to read symlink %llu", key.objectid);
+ goto out;
+ }
+ target[ret] = '\0';
}
- printf("<%s> ", typestr[item->type]);
- if (item->type == BTRFS_FT_CHRDEV || item->type == BTRFS_FT_BLKDEV)
- printf("%4u,%5u ", (unsigned int) (inode.rdev >> 20),
- (unsigned int) (inode.rdev & 0xfffff));
+ if (type < ARRAY_SIZE(dir_item_str) && dir_item_str[type])
+ printf("<%s> ", dir_item_str[type]);
else
- printf("%10llu ", inode.size);
-
- printf("%24.24s %.*s", filetime, item->name_len, name);
-
- if (item->type == BTRFS_FT_SYMLINK) {
- printf(" -> %s", target ? target : "?");
- if (target)
- free(target);
+ printf("DIR_ITEM.%u", type);
+ if (type == BTRFS_FT_CHRDEV || type == BTRFS_FT_BLKDEV) {
+ ASSERT(key.type == BTRFS_INODE_ITEM_KEY);
+ printf("%4llu,%5llu ", btrfs_stack_inode_rdev(&ii) >> 20,
+ btrfs_stack_inode_rdev(&ii) & 0xfffff);
+ } else {
+ if (key.type == BTRFS_INODE_ITEM_KEY)
+ printf("%10llu ", btrfs_stack_inode_size(&ii));
+ else
+ printf("%10llu ", 0ULL);
}
+ read_extent_buffer(eb, namebuf, (unsigned long)(di + 1),
+ btrfs_dir_name_len(eb, di));
+ printf("%24.24s %.*s", filetime, btrfs_dir_name_len(eb, di), namebuf);
+ if (type == BTRFS_FT_SYMLINK)
+ printf(" -> %s", target ? target : "?");
printf("\n");
-
- return 0;
+out:
+ free(target);
+ return ret;
}
int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
@@ -123,27 +158,29 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
int btrfs_ls(const char *path)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root = fs_info->fs_root;
+ u64 ino = BTRFS_FIRST_FREE_OBJECTID;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
-
- if (inr == -1ULL) {
+ ASSERT(fs_info);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ path, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup path %s\n", path);
- return -1;
+ return ret;
}
if (type != BTRFS_FT_DIR) {
- printf("Not a directory: %s\n", path);
- return -1;
+ error("Not a directory: %s", path);
+ return -ENOENT;
}
-
- if (btrfs_readdir(&root, inr, readdir_callback)) {
- printf("An error occured while listing directory %s\n", path);
- return -1;
+ ret = btrfs_iter_dir(root, ino, show_dir);
+ if (ret < 0) {
+ error("An error occured while listing directory %s", path);
+ return ret;
}
-
return 0;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 9057f2476526..eb32eb2006a8 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -43,13 +43,8 @@ u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
int btrfs_read_superblock(void);
/* dir-item.c */
-typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
- struct btrfs_dir_item *);
-
int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
-int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
-
/* root.c */
int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 78f7746d1f32..fe6966e896a1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1284,6 +1284,11 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path, u64 dir,
const char *name, int name_len,
int mod);
+typedef int (*btrfs_iter_dir_callback_t)(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ struct btrfs_dir_item *di);
+int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
+ btrfs_iter_dir_callback_t callback);
/* inode.c */
int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
struct btrfs_root **root_ret, u64 *ino_ret,
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 4bf45c2fa925..a6c66a021896 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -193,39 +193,55 @@ out:
return res ? 0 : -1;
}
-int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
- btrfs_readdir_callback_t callback)
+int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
+ btrfs_iter_dir_callback_t callback)
{
- struct __btrfs_path path;
- struct btrfs_key key, *found_key;
- struct btrfs_dir_item *item;
- int res = 0;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
- key.objectid = dir;
+ btrfs_init_path(&path);
+ key.objectid = ino;
key.type = BTRFS_DIR_INDEX_KEY;
key.offset = 0;
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
+ ret = btrfs_next_leaf(root, &path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ }
do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- break;
-
- item = btrfs_path_item_ptr(&path, struct btrfs_dir_item);
- btrfs_dir_item_to_cpu(item);
+ struct btrfs_dir_item *di;
- if (__verify_dir_item(item, 0, sizeof(*item) + item->name_len))
- continue;
- if (item->type == BTRFS_FT_XATTR)
- continue;
-
- if (callback(root, item))
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ if (key.objectid != ino || key.type != BTRFS_DIR_INDEX_KEY)
break;
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
+ di = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_dir_item);
+ if (verify_dir_item(root, path.nodes[0], di)) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = callback(root, path.nodes[0], di);
+ if (ret < 0)
+ goto out;
+ } while (!(ret = btrfs_next_item(root, &path)));
- return res < 0 ? -1 : 0;
+ if (ret > 0)
+ ret = 0;
+out:
+ btrfs_release_path(&path);
+ return ret;
}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 19/26] fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
Use extent buffer based infrastructure to re-implement btrfs_readdir().
Along this rework, some small corner cases fixed:
- Subvolume tree mtime
Mtime of a subvolume tree is recorded in its root item, since there is
no INODE_ITEM for it.
This needs extra search from tree root.
- Output the unknown type
If the DIR_ITEM is corrupted, at least don't try to access the memory
out of bounday.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 157 +++++++++++++++++++++++++++-----------------
fs/btrfs/btrfs.h | 5 --
fs/btrfs/ctree.h | 5 ++
fs/btrfs/dir-item.c | 68 +++++++++++--------
4 files changed, 144 insertions(+), 91 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 7e6c7a26e4cf..e7c7ddcfc551 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -15,67 +15,102 @@
struct btrfs_info btrfs_info;
struct btrfs_fs_info *current_fs_info;
-static int readdir_callback(const struct __btrfs_root *root,
- struct btrfs_dir_item *item)
+static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
+ struct btrfs_dir_item *di)
{
- static const char typestr[BTRFS_FT_MAX][4] = {
- [BTRFS_FT_UNKNOWN] = " ? ",
- [BTRFS_FT_REG_FILE] = " ",
- [BTRFS_FT_DIR] = "DIR",
- [BTRFS_FT_CHRDEV] = "CHR",
- [BTRFS_FT_BLKDEV] = "BLK",
- [BTRFS_FT_FIFO] = "FIF",
- [BTRFS_FT_SOCK] = "SCK",
- [BTRFS_FT_SYMLINK] = "SYM",
- [BTRFS_FT_XATTR] = " ? ",
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_inode_item ii;
+ struct btrfs_key key;
+ static const char* dir_item_str[] = {
+ [BTRFS_FT_REG_FILE] = "FILE",
+ [BTRFS_FT_DIR] = "DIR",
+ [BTRFS_FT_CHRDEV] = "CHRDEV",
+ [BTRFS_FT_BLKDEV] = "BLKDEV",
+ [BTRFS_FT_FIFO] = "FIFO",
+ [BTRFS_FT_SOCK] = "SOCK",
+ [BTRFS_FT_SYMLINK] = "SYMLINK",
+ [BTRFS_FT_XATTR] = "XATTR"
};
- struct btrfs_inode_item inode;
- const char *name = (const char *) (item + 1);
- char filetime[32], *target = NULL;
+ u8 type = btrfs_dir_type(eb, di);
+ char namebuf[BTRFS_NAME_LEN];
+ char *target = NULL;
+ char filetime[32];
time_t mtime;
+ int ret;
- if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
- &inode, NULL)) {
- printf("%s: Cannot find inode item for directory entry %.*s!\n",
- __func__, item->name_len, name);
- return 0;
- }
-
- mtime = inode.mtime.sec;
- ctime_r(&mtime, filetime);
+ btrfs_dir_item_key_to_cpu(eb, di, &key);
- if (item->type == BTRFS_FT_SYMLINK) {
- target = malloc(min(inode.size + 1,
- (u64) btrfs_info.sb.sectorsize));
+ if (key.type == BTRFS_ROOT_ITEM_KEY) {
+ struct btrfs_root *subvol;
- if (target && __btrfs_readlink(root, item->location.objectid,
- target)) {
- free(target);
- target = NULL;
+ /* It's a subvolume, get its mtime from root item */
+ subvol = btrfs_read_fs_root(fs_info, &key);
+ if (IS_ERR(subvol)) {
+ ret = PTR_ERR(subvol);
+ error("Can't find root %llu", key.objectid);
+ return ret;
}
+ mtime = btrfs_stack_timespec_sec(&subvol->root_item.otime);
+ } else {
+ struct btrfs_path path;
+
+ /* It's regular inode, get its mtime from inode item */
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret > 0)
+ ret = -ENOENT;
+ if (ret < 0) {
+ error("Can't find inode %llu", key.objectid);
+ btrfs_release_path(&path);
+ return ret;
+ }
+ read_extent_buffer(path.nodes[0], &ii,
+ btrfs_item_ptr_offset(path.nodes[0], path.slots[0]),
+ sizeof(ii));
+ btrfs_release_path(&path);
+ mtime = btrfs_stack_timespec_sec(&ii.mtime);
+ }
+ ctime_r(&mtime, filetime);
- if (!target)
- printf("%s: Cannot read symlink target!\n", __func__);
+ if (type == BTRFS_FT_SYMLINK) {
+ target = malloc(fs_info->sectorsize);
+ if (!target) {
+ error("Can't alloc memory for symlink %llu",
+ key.objectid);
+ return -ENOMEM;
+ }
+ ret = btrfs_readlink(root, key.objectid, target);
+ if (ret < 0) {
+ error("Failed to read symlink %llu", key.objectid);
+ goto out;
+ }
+ target[ret] = '\0';
}
- printf("<%s> ", typestr[item->type]);
- if (item->type == BTRFS_FT_CHRDEV || item->type == BTRFS_FT_BLKDEV)
- printf("%4u,%5u ", (unsigned int) (inode.rdev >> 20),
- (unsigned int) (inode.rdev & 0xfffff));
+ if (type < ARRAY_SIZE(dir_item_str) && dir_item_str[type])
+ printf("<%s> ", dir_item_str[type]);
else
- printf("%10llu ", inode.size);
-
- printf("%24.24s %.*s", filetime, item->name_len, name);
-
- if (item->type == BTRFS_FT_SYMLINK) {
- printf(" -> %s", target ? target : "?");
- if (target)
- free(target);
+ printf("DIR_ITEM.%u", type);
+ if (type == BTRFS_FT_CHRDEV || type == BTRFS_FT_BLKDEV) {
+ ASSERT(key.type == BTRFS_INODE_ITEM_KEY);
+ printf("%4llu,%5llu ", btrfs_stack_inode_rdev(&ii) >> 20,
+ btrfs_stack_inode_rdev(&ii) & 0xfffff);
+ } else {
+ if (key.type == BTRFS_INODE_ITEM_KEY)
+ printf("%10llu ", btrfs_stack_inode_size(&ii));
+ else
+ printf("%10llu ", 0ULL);
}
+ read_extent_buffer(eb, namebuf, (unsigned long)(di + 1),
+ btrfs_dir_name_len(eb, di));
+ printf("%24.24s %.*s", filetime, btrfs_dir_name_len(eb, di), namebuf);
+ if (type == BTRFS_FT_SYMLINK)
+ printf(" -> %s", target ? target : "?");
printf("\n");
-
- return 0;
+out:
+ free(target);
+ return ret;
}
int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
@@ -123,27 +158,29 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
int btrfs_ls(const char *path)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root = fs_info->fs_root;
+ u64 ino = BTRFS_FIRST_FREE_OBJECTID;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
-
- if (inr == -1ULL) {
+ ASSERT(fs_info);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ path, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup path %s\n", path);
- return -1;
+ return ret;
}
if (type != BTRFS_FT_DIR) {
- printf("Not a directory: %s\n", path);
- return -1;
+ error("Not a directory: %s", path);
+ return -ENOENT;
}
-
- if (btrfs_readdir(&root, inr, readdir_callback)) {
- printf("An error occured while listing directory %s\n", path);
- return -1;
+ ret = btrfs_iter_dir(root, ino, show_dir);
+ if (ret < 0) {
+ error("An error occured while listing directory %s", path);
+ return ret;
}
-
return 0;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 9057f2476526..eb32eb2006a8 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -43,13 +43,8 @@ u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
int btrfs_read_superblock(void);
/* dir-item.c */
-typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
- struct btrfs_dir_item *);
-
int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
-int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
-
/* root.c */
int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 78f7746d1f32..fe6966e896a1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1284,6 +1284,11 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_path *path, u64 dir,
const char *name, int name_len,
int mod);
+typedef int (*btrfs_iter_dir_callback_t)(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ struct btrfs_dir_item *di);
+int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
+ btrfs_iter_dir_callback_t callback);
/* inode.c */
int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
struct btrfs_root **root_ret, u64 *ino_ret,
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 4bf45c2fa925..a6c66a021896 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -193,39 +193,55 @@ out:
return res ? 0 : -1;
}
-int btrfs_readdir(const struct __btrfs_root *root, u64 dir,
- btrfs_readdir_callback_t callback)
+int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
+ btrfs_iter_dir_callback_t callback)
{
- struct __btrfs_path path;
- struct btrfs_key key, *found_key;
- struct btrfs_dir_item *item;
- int res = 0;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ int ret;
- key.objectid = dir;
+ btrfs_init_path(&path);
+ key.objectid = ino;
key.type = BTRFS_DIR_INDEX_KEY;
key.offset = 0;
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0)
+ return ret;
+ /* Should not happen */
+ if (ret == 0) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
+ ret = btrfs_next_leaf(root, &path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ }
do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- break;
-
- item = btrfs_path_item_ptr(&path, struct btrfs_dir_item);
- btrfs_dir_item_to_cpu(item);
+ struct btrfs_dir_item *di;
- if (__verify_dir_item(item, 0, sizeof(*item) + item->name_len))
- continue;
- if (item->type == BTRFS_FT_XATTR)
- continue;
-
- if (callback(root, item))
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ if (key.objectid != ino || key.type != BTRFS_DIR_INDEX_KEY)
break;
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
+ di = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_dir_item);
+ if (verify_dir_item(root, path.nodes[0], di)) {
+ ret = -EUCLEAN;
+ goto out;
+ }
+ ret = callback(root, path.nodes[0], di);
+ if (ret < 0)
+ goto out;
+ } while (!(ret = btrfs_next_item(root, &path)));
- return res < 0 ? -1 : 0;
+ if (ret > 0)
+ ret = 0;
+out:
+ btrfs_release_path(&path);
+ return ret;
}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 20/26] fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
The remaining function that still utilize __btrfs_lookup_path() is
btrfs_read().
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 65 +++++++++++++++++++++++++++++++++++-------------
fs/btrfs/inode.c | 1 -
2 files changed, 48 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index e7c7ddcfc551..8d1dee2f73c4 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -186,37 +186,66 @@ int btrfs_ls(const char *path)
int btrfs_exists(const char *file)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root;
+ u64 ino;
u8 type;
+ int ret;
+
+ ASSERT(fs_info);
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0)
+ return 0;
- return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
+ if (type == BTRFS_FT_REG_FILE)
+ return 1;
+ return 0;
}
int btrfs_size(const char *file, loff_t *size)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- struct btrfs_inode_item inode;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_inode_item *ii;
+ struct btrfs_root *root;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ u64 ino;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
- 40);
-
- if (inr == -1ULL) {
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup file %s\n", file);
- return -1;
+ return ret;
}
-
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
- return -1;
+ return -ENOENT;
}
+ btrfs_init_path(&path);
+ key.objectid = ino;
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.offset = 0;
- *size = inode.size;
- return 0;
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0) {
+ printf("Cannot lookup ino %llu\n", ino);
+ return ret;
+ }
+ if (ret > 0) {
+ printf("Ino %llu does not exist\n", ino);
+ ret = -ENOENT;
+ goto out;
+ }
+ ii = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_inode_item);
+ *size = btrfs_inode_size(path.nodes[0], ii);
+out:
+ btrfs_release_path(&path);
+ return ret;
}
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
@@ -268,7 +297,9 @@ void btrfs_close(void)
int btrfs_uuid(char *uuid_str)
{
#ifdef CONFIG_LIB_UUID
- uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
+ if (current_fs_info)
+ uuid_bin_to_str(current_fs_info->super_copy->fsid, uuid_str,
+ UUID_STR_FORMAT_STD);
return 0;
#endif
return -ENOSYS;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index af4f30bbd50c..ff411d5251e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -404,7 +404,6 @@ int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
}
while (*cur != '\0') {
-
cur = skip_current_directories(cur);
len = next_length(cur);
if (len > BTRFS_NAME_LEN) {
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 20/26] fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
The remaining function that still utilize __btrfs_lookup_path() is
btrfs_read().
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 65 +++++++++++++++++++++++++++++++++++-------------
fs/btrfs/inode.c | 1 -
2 files changed, 48 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index e7c7ddcfc551..8d1dee2f73c4 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -186,37 +186,66 @@ int btrfs_ls(const char *path)
int btrfs_exists(const char *file)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root;
+ u64 ino;
u8 type;
+ int ret;
+
+ ASSERT(fs_info);
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0)
+ return 0;
- return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
+ if (type == BTRFS_FT_REG_FILE)
+ return 1;
+ return 0;
}
int btrfs_size(const char *file, loff_t *size)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- struct btrfs_inode_item inode;
- u64 inr;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_inode_item *ii;
+ struct btrfs_root *root;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ u64 ino;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
- 40);
-
- if (inr == -1ULL) {
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup file %s\n", file);
- return -1;
+ return ret;
}
-
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
- return -1;
+ return -ENOENT;
}
+ btrfs_init_path(&path);
+ key.objectid = ino;
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.offset = 0;
- *size = inode.size;
- return 0;
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0) {
+ printf("Cannot lookup ino %llu\n", ino);
+ return ret;
+ }
+ if (ret > 0) {
+ printf("Ino %llu does not exist\n", ino);
+ ret = -ENOENT;
+ goto out;
+ }
+ ii = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_inode_item);
+ *size = btrfs_inode_size(path.nodes[0], ii);
+out:
+ btrfs_release_path(&path);
+ return ret;
}
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
@@ -268,7 +297,9 @@ void btrfs_close(void)
int btrfs_uuid(char *uuid_str)
{
#ifdef CONFIG_LIB_UUID
- uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
+ if (current_fs_info)
+ uuid_bin_to_str(current_fs_info->super_copy->fsid, uuid_str,
+ UUID_STR_FORMAT_STD);
return 0;
#endif
return -ENOSYS;
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index af4f30bbd50c..ff411d5251e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -404,7 +404,6 @@ int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
}
while (*cur != '\0') {
-
cur = skip_current_directories(cur);
len = next_length(cur);
if (len > BTRFS_NAME_LEN) {
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 21/26] fs: btrfs: Rename btrfs_file_read() and its callees to avoid name conflicts
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 2 +-
fs/btrfs/btrfs.h | 6 +++---
fs/btrfs/extent-io.c | 4 ++--
fs/btrfs/inode.c | 6 +++---
4 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 8d1dee2f73c4..3916696ab909 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -275,7 +275,7 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
if (len > inode.size - offset)
len = inode.size - offset;
- rd = btrfs_file_read(&root, inr, offset, len, buf);
+ rd = __btrfs_file_read(&root, inr, offset, len, buf);
if (rd == -1ULL) {
printf("An error occured while reading file %s\n", file);
return -1;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index eb32eb2006a8..025cf4007503 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -58,16 +58,16 @@ int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
-u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
+u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
/* extent-io.c */
-u64 btrfs_read_extent_inline(struct __btrfs_path *,
+u64 __btrfs_read_extent_inline(struct __btrfs_path *,
struct btrfs_file_extent_item *, u64, u64,
char *);
-u64 btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
+u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
u64, u64, char *);
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 456b8776ef67..2af710f0dd32 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,7 +13,7 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 btrfs_read_extent_inline(struct __btrfs_path *path,
+u64 __btrfs_read_extent_inline(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
@@ -65,7 +65,7 @@ err:
return -1ULL;
}
-u64 btrfs_read_extent_reg(struct __btrfs_path *path,
+u64 __btrfs_read_extent_reg(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ff411d5251e9..797063449ca6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -587,7 +587,7 @@ u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
return inr;
}
-u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
+u64 __btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
struct __btrfs_path path;
@@ -622,11 +622,11 @@ u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
if (extent->type == BTRFS_FILE_EXTENT_INLINE) {
btrfs_file_extent_item_to_cpu_inl(extent);
- rd = btrfs_read_extent_inline(&path, extent, offset,
+ rd = __btrfs_read_extent_inline(&path, extent, offset,
size, buf);
} else {
btrfs_file_extent_item_to_cpu(extent);
- rd = btrfs_read_extent_reg(&path, extent, offset, size,
+ rd = __btrfs_read_extent_reg(&path, extent, offset, size,
buf);
}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 21/26] fs: btrfs: Rename btrfs_file_read() and its callees to avoid name conflicts
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 2 +-
fs/btrfs/btrfs.h | 6 +++---
fs/btrfs/extent-io.c | 4 ++--
fs/btrfs/inode.c | 6 +++---
4 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 8d1dee2f73c4..3916696ab909 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -275,7 +275,7 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
if (len > inode.size - offset)
len = inode.size - offset;
- rd = btrfs_file_read(&root, inr, offset, len, buf);
+ rd = __btrfs_file_read(&root, inr, offset, len, buf);
if (rd == -1ULL) {
printf("An error occured while reading file %s\n", file);
return -1;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index eb32eb2006a8..025cf4007503 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -58,16 +58,16 @@ int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
-u64 btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
+u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
/* extent-io.c */
-u64 btrfs_read_extent_inline(struct __btrfs_path *,
+u64 __btrfs_read_extent_inline(struct __btrfs_path *,
struct btrfs_file_extent_item *, u64, u64,
char *);
-u64 btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
+u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
u64, u64, char *);
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 456b8776ef67..2af710f0dd32 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,7 +13,7 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 btrfs_read_extent_inline(struct __btrfs_path *path,
+u64 __btrfs_read_extent_inline(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
@@ -65,7 +65,7 @@ err:
return -1ULL;
}
-u64 btrfs_read_extent_reg(struct __btrfs_path *path,
+u64 __btrfs_read_extent_reg(struct __btrfs_path *path,
struct btrfs_file_extent_item *extent, u64 offset,
u64 size, char *out)
{
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ff411d5251e9..797063449ca6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -587,7 +587,7 @@ u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
return inr;
}
-u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
+u64 __btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
u64 size, char *buf)
{
struct __btrfs_path path;
@@ -622,11 +622,11 @@ u64 btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
if (extent->type == BTRFS_FILE_EXTENT_INLINE) {
btrfs_file_extent_item_to_cpu_inl(extent);
- rd = btrfs_read_extent_inline(&path, extent, offset,
+ rd = __btrfs_read_extent_inline(&path, extent, offset,
size, buf);
} else {
btrfs_file_extent_item_to_cpu(extent);
- rd = btrfs_read_extent_reg(&path, extent, offset, size,
+ rd = __btrfs_read_extent_reg(&path, extent, offset, size,
buf);
}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 22/26] fs: btrfs: Introduce btrfs_read_extent_inline() and btrfs_read_extent_reg()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
These two functions are used to do sector aligned read, which will be
later used to implement btrfs_file_read().
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 5 ++
fs/btrfs/disk-io.c | 36 ++++++++++
fs/btrfs/disk-io.h | 2 +
fs/btrfs/inode.c | 162 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 205 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index fe6966e896a1..602f99b5e593 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1293,6 +1293,11 @@ int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
struct btrfs_root **root_ret, u64 *ino_ret,
u8 *type_ret, int symlink_limit);
+int btrfs_read_extent_inline(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, char *dest);
+int btrfs_read_extent_reg(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, u64 offset,
+ int len, char *dest);
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8dc816f7a8c9..be2c26d323f6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -565,6 +565,42 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
return ERR_PTR(ret);
}
+int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
+ u64 *len, int mirror)
+{
+ u64 offset = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ struct btrfs_device *device;
+ int ret = 0;
+ u64 max_len = *len;
+
+ ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
+ NULL);
+ if (ret) {
+ fprintf(stderr, "Couldn't map the block %llu\n",
+ logical + offset);
+ goto err;
+ }
+ device = multi->stripes[0].dev;
+
+ if (*len > max_len)
+ *len = max_len;
+ if (!device->desc || !device->part) {
+ ret = -EIO;
+ goto err;
+ }
+
+ ret = __btrfs_devread(device->desc, device->part, data, *len,
+ multi->stripes[0].physical);
+ if (ret != *len)
+ ret = -EIO;
+ else
+ ret = 0;
+err:
+ kfree(multi);
+ return ret;
+}
+
void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
u64 objectid)
{
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index d8f6f827550a..7c321d842561 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -18,6 +18,8 @@ int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirr
struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
u64 parent_transid);
+int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
+ u64 *len, int mirror);
struct extent_buffer* btrfs_find_create_tree_block(
struct btrfs_fs_info *fs_info, u64 bytenr);
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 797063449ca6..986b9347b012 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5,9 +5,12 @@
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
+#include <linux/kernel.h>
#include <malloc.h>
+#include <memalign.h>
#include "btrfs.h"
#include "disk-io.h"
+#include "volumes.h"
u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
@@ -652,3 +655,162 @@ out:
__btrfs_free_path(&path);
return rd_all;
}
+
+/*
+ * Read out inline extent.
+ *
+ * Since inline extent should only exist for offset 0, no need for extra
+ * parameters.
+ * Truncating should be handled by the caller.
+ *
+ * Return the number of bytes read.
+ * Return <0 for error.
+ */
+int btrfs_read_extent_inline(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ int slot = path->slots[0];
+ char *cbuf = NULL;
+ char *dbuf = NULL;
+ u32 csize;
+ u32 dsize;
+ int ret;
+
+ csize = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(slot));
+ if (btrfs_file_extent_compression(leaf, fi) == BTRFS_COMPRESS_NONE) {
+ /* Uncompressed, just read it out */
+ read_extent_buffer(leaf, dest,
+ btrfs_file_extent_inline_start(fi),
+ csize);
+ return csize;
+ }
+
+ /* Compressed extent, prepare the compressed and data buffer */
+ dsize = btrfs_file_extent_ram_bytes(leaf, fi);
+ cbuf = malloc(csize);
+ dbuf = malloc(dsize);
+ if (!cbuf || !dbuf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ read_extent_buffer(leaf, cbuf, btrfs_file_extent_inline_start(fi),
+ csize);
+ ret = btrfs_decompress(btrfs_file_extent_compression(leaf, fi),
+ cbuf, csize, dbuf, dsize);
+ if (ret < 0 || ret != dsize) {
+ ret = -EIO;
+ goto out;
+ }
+ memcpy(dest, dbuf, dsize);
+ ret = dsize;
+out:
+ free(cbuf);
+ free(dbuf);
+ return ret;
+}
+
+/*
+ * Read out regular extent.
+ *
+ * Truncating should be handled by the caller.
+ *
+ * @offset and @len should not cross the extent boundary.
+ * Return the number of bytes read.
+ * Return <0 for error.
+ */
+int btrfs_read_extent_reg(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, u64 offset,
+ int len, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ struct btrfs_fs_info *fs_info = leaf->fs_info;
+ struct btrfs_key key;
+ u64 extent_num_bytes;
+ u64 disk_bytenr;
+ u64 read;
+ char *cbuf = NULL;
+ char *dbuf = NULL;
+ u32 csize;
+ u32 dsize;
+ bool finished = false;
+ int num_copies;
+ int i;
+ int slot = path->slots[0];
+ int ret;
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ extent_num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
+ ASSERT(IS_ALIGNED(offset, fs_info->sectorsize) &&
+ IS_ALIGNED(len, fs_info->sectorsize));
+ ASSERT(offset >= key.offset &&
+ offset + len <= key.offset + extent_num_bytes);
+
+ /* Preallocated or hole , fill @dest with zero */
+ if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_PREALLOC ||
+ btrfs_file_extent_disk_bytenr(leaf, fi) == 0) {
+ memset(dest, 0, len);
+ return len;
+ }
+
+ if (btrfs_file_extent_compression(leaf, fi) == BTRFS_COMPRESS_NONE) {
+ u64 logical;
+
+ logical = btrfs_file_extent_disk_bytenr(leaf, fi) +
+ btrfs_file_extent_offset(leaf, fi) +
+ offset - key.offset;
+ read = len;
+
+ num_copies = btrfs_num_copies(fs_info, logical, len);
+ for (i = 1; i <= num_copies; i++) {
+ ret = read_extent_data(fs_info, dest, logical, &read, i);
+ if (ret < 0 || read != len)
+ continue;
+ finished = true;
+ break;
+ }
+ if (!finished)
+ return -EIO;
+ return len;
+ }
+
+ csize = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ dsize = btrfs_file_extent_ram_bytes(leaf, fi);
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_copies = btrfs_num_copies(fs_info, disk_bytenr, csize);
+
+ cbuf = malloc_cache_aligned(csize);
+ dbuf = malloc_cache_aligned(dsize);
+ if (!cbuf || !dbuf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ /* For compressed extent, we must read the whole on-disk extent */
+ for (i = 1; i <= num_copies; i++) {
+ read = csize;
+ ret = read_extent_data(fs_info, cbuf, disk_bytenr,
+ &read, i);
+ if (ret < 0 || read != csize)
+ continue;
+ finished = true;
+ break;
+ }
+ if (!finished) {
+ ret = -EIO;
+ goto out;
+ }
+
+ ret = btrfs_decompress(btrfs_file_extent_compression(leaf, fi), cbuf,
+ csize, dbuf, dsize);
+ if (ret != dsize) {
+ ret = -EIO;
+ goto out;
+ }
+ /* Then copy the needed part */
+ memcpy(dest, dbuf + btrfs_file_extent_offset(leaf, fi), len);
+ ret = len;
+out:
+ free(cbuf);
+ free(dbuf);
+ return ret;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 22/26] fs: btrfs: Introduce btrfs_read_extent_inline() and btrfs_read_extent_reg()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
These two functions are used to do sector aligned read, which will be
later used to implement btrfs_file_read().
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/ctree.h | 5 ++
fs/btrfs/disk-io.c | 36 ++++++++++
fs/btrfs/disk-io.h | 2 +
fs/btrfs/inode.c | 162 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 205 insertions(+)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index fe6966e896a1..602f99b5e593 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1293,6 +1293,11 @@ int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
struct btrfs_root **root_ret, u64 *ino_ret,
u8 *type_ret, int symlink_limit);
+int btrfs_read_extent_inline(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, char *dest);
+int btrfs_read_extent_reg(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, u64 offset,
+ int len, char *dest);
/* ctree.c */
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8dc816f7a8c9..be2c26d323f6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -565,6 +565,42 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
return ERR_PTR(ret);
}
+int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
+ u64 *len, int mirror)
+{
+ u64 offset = 0;
+ struct btrfs_multi_bio *multi = NULL;
+ struct btrfs_device *device;
+ int ret = 0;
+ u64 max_len = *len;
+
+ ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror,
+ NULL);
+ if (ret) {
+ fprintf(stderr, "Couldn't map the block %llu\n",
+ logical + offset);
+ goto err;
+ }
+ device = multi->stripes[0].dev;
+
+ if (*len > max_len)
+ *len = max_len;
+ if (!device->desc || !device->part) {
+ ret = -EIO;
+ goto err;
+ }
+
+ ret = __btrfs_devread(device->desc, device->part, data, *len,
+ multi->stripes[0].physical);
+ if (ret != *len)
+ ret = -EIO;
+ else
+ ret = 0;
+err:
+ kfree(multi);
+ return ret;
+}
+
void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
u64 objectid)
{
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index d8f6f827550a..7c321d842561 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -18,6 +18,8 @@ int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirr
struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
u64 parent_transid);
+int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical,
+ u64 *len, int mirror);
struct extent_buffer* btrfs_find_create_tree_block(
struct btrfs_fs_info *fs_info, u64 bytenr);
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 797063449ca6..986b9347b012 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5,9 +5,12 @@
* 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
*/
+#include <linux/kernel.h>
#include <malloc.h>
+#include <memalign.h>
#include "btrfs.h"
#include "disk-io.h"
+#include "volumes.h"
u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
struct btrfs_inode_ref *refp, char *name)
@@ -652,3 +655,162 @@ out:
__btrfs_free_path(&path);
return rd_all;
}
+
+/*
+ * Read out inline extent.
+ *
+ * Since inline extent should only exist for offset 0, no need for extra
+ * parameters.
+ * Truncating should be handled by the caller.
+ *
+ * Return the number of bytes read.
+ * Return <0 for error.
+ */
+int btrfs_read_extent_inline(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ int slot = path->slots[0];
+ char *cbuf = NULL;
+ char *dbuf = NULL;
+ u32 csize;
+ u32 dsize;
+ int ret;
+
+ csize = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(slot));
+ if (btrfs_file_extent_compression(leaf, fi) == BTRFS_COMPRESS_NONE) {
+ /* Uncompressed, just read it out */
+ read_extent_buffer(leaf, dest,
+ btrfs_file_extent_inline_start(fi),
+ csize);
+ return csize;
+ }
+
+ /* Compressed extent, prepare the compressed and data buffer */
+ dsize = btrfs_file_extent_ram_bytes(leaf, fi);
+ cbuf = malloc(csize);
+ dbuf = malloc(dsize);
+ if (!cbuf || !dbuf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ read_extent_buffer(leaf, cbuf, btrfs_file_extent_inline_start(fi),
+ csize);
+ ret = btrfs_decompress(btrfs_file_extent_compression(leaf, fi),
+ cbuf, csize, dbuf, dsize);
+ if (ret < 0 || ret != dsize) {
+ ret = -EIO;
+ goto out;
+ }
+ memcpy(dest, dbuf, dsize);
+ ret = dsize;
+out:
+ free(cbuf);
+ free(dbuf);
+ return ret;
+}
+
+/*
+ * Read out regular extent.
+ *
+ * Truncating should be handled by the caller.
+ *
+ * @offset and @len should not cross the extent boundary.
+ * Return the number of bytes read.
+ * Return <0 for error.
+ */
+int btrfs_read_extent_reg(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi, u64 offset,
+ int len, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ struct btrfs_fs_info *fs_info = leaf->fs_info;
+ struct btrfs_key key;
+ u64 extent_num_bytes;
+ u64 disk_bytenr;
+ u64 read;
+ char *cbuf = NULL;
+ char *dbuf = NULL;
+ u32 csize;
+ u32 dsize;
+ bool finished = false;
+ int num_copies;
+ int i;
+ int slot = path->slots[0];
+ int ret;
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ extent_num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
+ ASSERT(IS_ALIGNED(offset, fs_info->sectorsize) &&
+ IS_ALIGNED(len, fs_info->sectorsize));
+ ASSERT(offset >= key.offset &&
+ offset + len <= key.offset + extent_num_bytes);
+
+ /* Preallocated or hole , fill @dest with zero */
+ if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_PREALLOC ||
+ btrfs_file_extent_disk_bytenr(leaf, fi) == 0) {
+ memset(dest, 0, len);
+ return len;
+ }
+
+ if (btrfs_file_extent_compression(leaf, fi) == BTRFS_COMPRESS_NONE) {
+ u64 logical;
+
+ logical = btrfs_file_extent_disk_bytenr(leaf, fi) +
+ btrfs_file_extent_offset(leaf, fi) +
+ offset - key.offset;
+ read = len;
+
+ num_copies = btrfs_num_copies(fs_info, logical, len);
+ for (i = 1; i <= num_copies; i++) {
+ ret = read_extent_data(fs_info, dest, logical, &read, i);
+ if (ret < 0 || read != len)
+ continue;
+ finished = true;
+ break;
+ }
+ if (!finished)
+ return -EIO;
+ return len;
+ }
+
+ csize = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ dsize = btrfs_file_extent_ram_bytes(leaf, fi);
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_copies = btrfs_num_copies(fs_info, disk_bytenr, csize);
+
+ cbuf = malloc_cache_aligned(csize);
+ dbuf = malloc_cache_aligned(dsize);
+ if (!cbuf || !dbuf) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ /* For compressed extent, we must read the whole on-disk extent */
+ for (i = 1; i <= num_copies; i++) {
+ read = csize;
+ ret = read_extent_data(fs_info, cbuf, disk_bytenr,
+ &read, i);
+ if (ret < 0 || read != csize)
+ continue;
+ finished = true;
+ break;
+ }
+ if (!finished) {
+ ret = -EIO;
+ goto out;
+ }
+
+ ret = btrfs_decompress(btrfs_file_extent_compression(leaf, fi), cbuf,
+ csize, dbuf, dsize);
+ if (ret != dsize) {
+ ret = -EIO;
+ goto out;
+ }
+ /* Then copy the needed part */
+ memcpy(dest, dbuf + btrfs_file_extent_offset(leaf, fi), len);
+ ret = len;
+out:
+ free(cbuf);
+ free(dbuf);
+ return ret;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 23/26] fs: btrfs: Introduce lookup_data_extent() for later use
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/inode.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 986b9347b012..3332055ff840 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -814,3 +814,104 @@ out:
free(dbuf);
return ret;
}
+
+/*
+ * Get the first file extent that covers bytenr @file_offset.
+ *
+ * @file_offset must be aligned to sectorsize.
+ *
+ * return 0 for found, and path points to the file extent.
+ * return >0 for not found, and fill @next_offset.
+ * @next_offset can be 0 if there is no next file extent.
+ * return <0 for error.
+ */
+static int lookup_data_extent(struct btrfs_root *root, struct btrfs_path *path,
+ u64 ino, u64 file_offset, u64 *next_offset)
+{
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ u8 extent_type;
+ int ret = 0;
+
+ ASSERT(IS_ALIGNED(file_offset, root->fs_info->sectorsize));
+ key.objectid = ino;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ key.offset = file_offset;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ /* Error or we're already at the file extent */
+ if (ret <= 0)
+ return ret;
+ if (ret > 0) {
+ /* Check previous file extent */
+ ret = btrfs_previous_item(root, path, ino,
+ BTRFS_EXTENT_DATA_KEY);
+ if (ret < 0)
+ return ret;
+ if (ret > 0)
+ goto check_next;
+ }
+ /* Now the key.offset must be smaller than @file_offset */
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.objectid != ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY)
+ goto check_next;
+
+ fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(path->nodes[0], fi);
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ if (file_offset == 0)
+ return 0;
+ /* Inline extent should be the only extent, no next extent. */
+ *next_offset = 0;
+ return 1;
+ }
+
+ /* This file extent covers @file_offset */
+ if (key.offset <= file_offset && key.offset +
+ btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
+ return 0;
+check_next:
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ *next_offset = 0;
+ return 1;
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_file_extent_item);
+ /* Next next data extent */
+ if (key.objectid != ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY) {
+ *next_offset = 0;
+ return 1;
+ }
+ /* Current file extent already beyond @file_offset */
+ if (key.offset > file_offset) {
+ *next_offset = key.offset;
+ return 1;
+ }
+ /* This file extent covers @file_offset */
+ if (key.offset <= file_offset && key.offset +
+ btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
+ return 0;
+ /* This file extent ends before @file_offset, check next */
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ *next_offset = 0;
+ return 1;
+ }
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.type != BTRFS_EXTENT_DATA_KEY || key.objectid != ino) {
+ *next_offset = 0;
+ return 1;
+ }
+ *next_offset = key.offset;
+ return 1;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 23/26] fs: btrfs: Introduce lookup_data_extent() for later use
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/inode.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 986b9347b012..3332055ff840 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -814,3 +814,104 @@ out:
free(dbuf);
return ret;
}
+
+/*
+ * Get the first file extent that covers bytenr @file_offset.
+ *
+ * @file_offset must be aligned to sectorsize.
+ *
+ * return 0 for found, and path points to the file extent.
+ * return >0 for not found, and fill @next_offset.
+ * @next_offset can be 0 if there is no next file extent.
+ * return <0 for error.
+ */
+static int lookup_data_extent(struct btrfs_root *root, struct btrfs_path *path,
+ u64 ino, u64 file_offset, u64 *next_offset)
+{
+ struct btrfs_key key;
+ struct btrfs_file_extent_item *fi;
+ u8 extent_type;
+ int ret = 0;
+
+ ASSERT(IS_ALIGNED(file_offset, root->fs_info->sectorsize));
+ key.objectid = ino;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ key.offset = file_offset;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ /* Error or we're already at the file extent */
+ if (ret <= 0)
+ return ret;
+ if (ret > 0) {
+ /* Check previous file extent */
+ ret = btrfs_previous_item(root, path, ino,
+ BTRFS_EXTENT_DATA_KEY);
+ if (ret < 0)
+ return ret;
+ if (ret > 0)
+ goto check_next;
+ }
+ /* Now the key.offset must be smaller than @file_offset */
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.objectid != ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY)
+ goto check_next;
+
+ fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(path->nodes[0], fi);
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ if (file_offset == 0)
+ return 0;
+ /* Inline extent should be the only extent, no next extent. */
+ *next_offset = 0;
+ return 1;
+ }
+
+ /* This file extent covers @file_offset */
+ if (key.offset <= file_offset && key.offset +
+ btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
+ return 0;
+check_next:
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ *next_offset = 0;
+ return 1;
+ }
+
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_file_extent_item);
+ /* Next next data extent */
+ if (key.objectid != ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY) {
+ *next_offset = 0;
+ return 1;
+ }
+ /* Current file extent already beyond @file_offset */
+ if (key.offset > file_offset) {
+ *next_offset = key.offset;
+ return 1;
+ }
+ /* This file extent covers @file_offset */
+ if (key.offset <= file_offset && key.offset +
+ btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
+ return 0;
+ /* This file extent ends before @file_offset, check next */
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ return ret;
+ if (ret > 0) {
+ *next_offset = 0;
+ return 1;
+ }
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.type != BTRFS_EXTENT_DATA_KEY || key.objectid != ino) {
+ *next_offset = 0;
+ return 1;
+ }
+ *next_offset = key.offset;
+ return 1;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 24/26] fs: btrfs: Implement btrfs_file_read()
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
This version of btrfs_file_read() will have the following new features:
- Try all mirrors
- More hanlding on unaligned size
- Better compressed extent handling
The old implementation doesn't handle compressed extent with offset
properly.
As we need to read out the whole compressed extent, then decompress
the whole extent, then only copy the referred part.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 42 ++++++++------
fs/btrfs/btrfs.h | 2 +
fs/btrfs/inode.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 173 insertions(+), 17 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 3916696ab909..023268152319 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -251,37 +251,45 @@ out:
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- struct btrfs_inode_item inode;
- u64 inr, rd;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root;
+ loff_t real_size;
+ u64 ino;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
- 40);
-
- if (inr == -1ULL) {
+ ASSERT(fs_info);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup file %s\n", file);
- return -1;
+ return ret;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
- return -1;
+ return -EINVAL;
}
- if (!len)
- len = inode.size;
+ if (!len) {
+ ret = btrfs_size(file, &real_size);
+ if (ret < 0) {
+ printf("Failed to get inode size: %s\n", file);
+ return ret;
+ }
+ len = real_size;
+ }
- if (len > inode.size - offset)
- len = inode.size - offset;
+ if (len > real_size - offset)
+ len = real_size - offset;
- rd = __btrfs_file_read(&root, inr, offset, len, buf);
- if (rd == -1ULL) {
+ ret = btrfs_file_read(root, ino, offset, len, buf);
+ if (ret < 0) {
printf("An error occured while reading file %s\n", file);
- return -1;
+ return ret;
}
- *actread = rd;
+ *actread = len;
return 0;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 025cf4007503..6963e5ac447e 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -59,6 +59,8 @@ int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
+int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
+ char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3332055ff840..faa8e3dbb76a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -915,3 +915,149 @@ check_next:
*next_offset = key.offset;
return 1;
}
+
+static int read_and_truncate_page(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi,
+ int start, int len, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ struct btrfs_fs_info *fs_info = leaf->fs_info;
+ u64 aligned_start = round_down(start, fs_info->sectorsize);
+ u8 extent_type;
+ char *buf;
+ int page_off = start - aligned_start;
+ int page_len = fs_info->sectorsize - page_off;
+ int ret;
+
+ ASSERT(start + len <= aligned_start + fs_info->sectorsize);
+ buf = malloc_cache_aligned(fs_info->sectorsize);
+ if (!buf)
+ return -ENOMEM;
+
+ extent_type = btrfs_file_extent_type(leaf, fi);
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ ret = btrfs_read_extent_inline(path, fi, buf);
+ memcpy(dest, buf + page_off, min(page_len, ret));
+ free(buf);
+ return len;
+ }
+
+ ret = btrfs_read_extent_reg(path, fi,
+ round_down(start, fs_info->sectorsize),
+ fs_info->sectorsize, buf);
+ if (ret < 0) {
+ free(buf);
+ return ret;
+ }
+ memcpy(dest, buf + page_off, page_len);
+ free(buf);
+ return len;
+}
+
+int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
+ char *dest)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ u64 aligned_start = round_down(file_offset, fs_info->sectorsize);
+ u64 aligned_end = round_down(file_offset + len, fs_info->sectorsize);
+ u64 next_offset;
+ u64 cur = aligned_start;
+ int ret = 0;
+
+ btrfs_init_path(&path);
+
+ /* Set the whole dest all zero, so we won't need to bother holes */
+ memset(dest, 0, len);
+
+ /* Read out the leading unaligned part */
+ if (aligned_start != file_offset) {
+ ret = lookup_data_extent(root, &path, ino, aligned_start,
+ &next_offset);
+ if (ret < 0)
+ goto out;
+ if (ret == 0) {
+ /* Read the unaligned part out*/
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ ret = read_and_truncate_page(&path, fi, file_offset,
+ round_up(file_offset, fs_info->sectorsize) -
+ file_offset, dest);
+ if (ret < 0)
+ goto out;
+ cur += fs_info->sectorsize;
+ } else {
+ /* The whole file is a hole */
+ if (!next_offset) {
+ memset(dest, 0, len);
+ return len;
+ }
+ cur = next_offset;
+ }
+ }
+
+ /* Read the aligned part */
+ while (cur < aligned_end) {
+ u64 extent_num_bytes;
+ u8 type;
+
+ btrfs_release_path(&path);
+ ret = lookup_data_extent(root, &path, ino, cur, &next_offset);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ /* No next, direct exit */
+ if (!next_offset) {
+ ret = 0;
+ goto out;
+ }
+ }
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ type = btrfs_file_extent_type(path.nodes[0], fi);
+ if (type == BTRFS_FILE_EXTENT_INLINE) {
+ ret = btrfs_read_extent_inline(&path, fi, dest);
+ goto out;
+ }
+ /* Skip holes, as we have zeroed the dest */
+ if (type == BTRFS_FILE_EXTENT_PREALLOC ||
+ btrfs_file_extent_disk_bytenr(path.nodes[0], fi) == 0) {
+ cur = key.offset + btrfs_file_extent_num_bytes(
+ path.nodes[0], fi);
+ continue;
+ }
+
+ /* Read the remaining part of the extent */
+ extent_num_bytes = btrfs_file_extent_num_bytes(path.nodes[0],
+ fi);
+ ret = btrfs_read_extent_reg(&path, fi, cur,
+ min(extent_num_bytes, aligned_end - cur),
+ dest + cur - file_offset);
+ if (ret < 0)
+ goto out;
+ cur += min(extent_num_bytes, aligned_end - cur);
+ }
+
+ /* Read the tailing unaligned part*/
+ if (file_offset + len != aligned_end) {
+ btrfs_release_path(&path);
+ ret = lookup_data_extent(root, &path, ino, aligned_end,
+ &next_offset);
+ /* <0 is error, >0 means no extent */
+ if (ret)
+ goto out;
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ ret = read_and_truncate_page(&path, fi, aligned_end,
+ file_offset + len - aligned_end,
+ dest + aligned_end - file_offset);
+ }
+out:
+ btrfs_release_path(&path);
+ if (ret < 0)
+ return ret;
+ return len;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 24/26] fs: btrfs: Implement btrfs_file_read()
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
This version of btrfs_file_read() will have the following new features:
- Try all mirrors
- More hanlding on unaligned size
- Better compressed extent handling
The old implementation doesn't handle compressed extent with offset
properly.
As we need to read out the whole compressed extent, then decompress
the whole extent, then only copy the referred part.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/btrfs.c | 42 ++++++++------
fs/btrfs/btrfs.h | 2 +
fs/btrfs/inode.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 173 insertions(+), 17 deletions(-)
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 3916696ab909..023268152319 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -251,37 +251,45 @@ out:
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
- struct __btrfs_root root = btrfs_info.fs_root;
- struct btrfs_inode_item inode;
- u64 inr, rd;
+ struct btrfs_fs_info *fs_info = current_fs_info;
+ struct btrfs_root *root;
+ loff_t real_size;
+ u64 ino;
u8 type;
+ int ret;
- inr = __btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
- 40);
-
- if (inr == -1ULL) {
+ ASSERT(fs_info);
+ ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
+ file, &root, &ino, &type, 40);
+ if (ret < 0) {
printf("Cannot lookup file %s\n", file);
- return -1;
+ return ret;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
- return -1;
+ return -EINVAL;
}
- if (!len)
- len = inode.size;
+ if (!len) {
+ ret = btrfs_size(file, &real_size);
+ if (ret < 0) {
+ printf("Failed to get inode size: %s\n", file);
+ return ret;
+ }
+ len = real_size;
+ }
- if (len > inode.size - offset)
- len = inode.size - offset;
+ if (len > real_size - offset)
+ len = real_size - offset;
- rd = __btrfs_file_read(&root, inr, offset, len, buf);
- if (rd == -1ULL) {
+ ret = btrfs_file_read(root, ino, offset, len, buf);
+ if (ret < 0) {
printf("An error occured while reading file %s\n", file);
- return -1;
+ return ret;
}
- *actread = rd;
+ *actread = len;
return 0;
}
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 025cf4007503..6963e5ac447e 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -59,6 +59,8 @@ int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
+int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
+ char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3332055ff840..faa8e3dbb76a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -915,3 +915,149 @@ check_next:
*next_offset = key.offset;
return 1;
}
+
+static int read_and_truncate_page(struct btrfs_path *path,
+ struct btrfs_file_extent_item *fi,
+ int start, int len, char *dest)
+{
+ struct extent_buffer *leaf = path->nodes[0];
+ struct btrfs_fs_info *fs_info = leaf->fs_info;
+ u64 aligned_start = round_down(start, fs_info->sectorsize);
+ u8 extent_type;
+ char *buf;
+ int page_off = start - aligned_start;
+ int page_len = fs_info->sectorsize - page_off;
+ int ret;
+
+ ASSERT(start + len <= aligned_start + fs_info->sectorsize);
+ buf = malloc_cache_aligned(fs_info->sectorsize);
+ if (!buf)
+ return -ENOMEM;
+
+ extent_type = btrfs_file_extent_type(leaf, fi);
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ ret = btrfs_read_extent_inline(path, fi, buf);
+ memcpy(dest, buf + page_off, min(page_len, ret));
+ free(buf);
+ return len;
+ }
+
+ ret = btrfs_read_extent_reg(path, fi,
+ round_down(start, fs_info->sectorsize),
+ fs_info->sectorsize, buf);
+ if (ret < 0) {
+ free(buf);
+ return ret;
+ }
+ memcpy(dest, buf + page_off, page_len);
+ free(buf);
+ return len;
+}
+
+int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
+ char *dest)
+{
+ struct btrfs_fs_info *fs_info = root->fs_info;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ u64 aligned_start = round_down(file_offset, fs_info->sectorsize);
+ u64 aligned_end = round_down(file_offset + len, fs_info->sectorsize);
+ u64 next_offset;
+ u64 cur = aligned_start;
+ int ret = 0;
+
+ btrfs_init_path(&path);
+
+ /* Set the whole dest all zero, so we won't need to bother holes */
+ memset(dest, 0, len);
+
+ /* Read out the leading unaligned part */
+ if (aligned_start != file_offset) {
+ ret = lookup_data_extent(root, &path, ino, aligned_start,
+ &next_offset);
+ if (ret < 0)
+ goto out;
+ if (ret == 0) {
+ /* Read the unaligned part out*/
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ ret = read_and_truncate_page(&path, fi, file_offset,
+ round_up(file_offset, fs_info->sectorsize) -
+ file_offset, dest);
+ if (ret < 0)
+ goto out;
+ cur += fs_info->sectorsize;
+ } else {
+ /* The whole file is a hole */
+ if (!next_offset) {
+ memset(dest, 0, len);
+ return len;
+ }
+ cur = next_offset;
+ }
+ }
+
+ /* Read the aligned part */
+ while (cur < aligned_end) {
+ u64 extent_num_bytes;
+ u8 type;
+
+ btrfs_release_path(&path);
+ ret = lookup_data_extent(root, &path, ino, cur, &next_offset);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ /* No next, direct exit */
+ if (!next_offset) {
+ ret = 0;
+ goto out;
+ }
+ }
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
+ type = btrfs_file_extent_type(path.nodes[0], fi);
+ if (type == BTRFS_FILE_EXTENT_INLINE) {
+ ret = btrfs_read_extent_inline(&path, fi, dest);
+ goto out;
+ }
+ /* Skip holes, as we have zeroed the dest */
+ if (type == BTRFS_FILE_EXTENT_PREALLOC ||
+ btrfs_file_extent_disk_bytenr(path.nodes[0], fi) == 0) {
+ cur = key.offset + btrfs_file_extent_num_bytes(
+ path.nodes[0], fi);
+ continue;
+ }
+
+ /* Read the remaining part of the extent */
+ extent_num_bytes = btrfs_file_extent_num_bytes(path.nodes[0],
+ fi);
+ ret = btrfs_read_extent_reg(&path, fi, cur,
+ min(extent_num_bytes, aligned_end - cur),
+ dest + cur - file_offset);
+ if (ret < 0)
+ goto out;
+ cur += min(extent_num_bytes, aligned_end - cur);
+ }
+
+ /* Read the tailing unaligned part*/
+ if (file_offset + len != aligned_end) {
+ btrfs_release_path(&path);
+ ret = lookup_data_extent(root, &path, ino, aligned_end,
+ &next_offset);
+ /* <0 is error, >0 means no extent */
+ if (ret)
+ goto out;
+ fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
+ struct btrfs_file_extent_item);
+ ret = read_and_truncate_page(&path, fi, aligned_end,
+ file_offset + len - aligned_end,
+ dest + aligned_end - file_offset);
+ }
+out:
+ btrfs_release_path(&path);
+ if (ret < 0)
+ return ret;
+ return len;
+}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 25/26] fs: btrfs: Cleanup the old implementation
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 4 +-
fs/btrfs/btrfs.c | 31 ----
fs/btrfs/btrfs.h | 47 ------
fs/btrfs/chunk-map.c | 177 ----------------------
fs/btrfs/compression.c | 2 +-
fs/btrfs/ctree.c | 290 ------------------------------------
fs/btrfs/ctree.h | 63 --------
fs/btrfs/dir-item.c | 79 ----------
fs/btrfs/disk-io.c | 30 ----
fs/btrfs/disk-io.h | 3 -
fs/btrfs/extent-io.c | 110 --------------
fs/btrfs/inode.c | 323 -----------------------------------------
fs/btrfs/root.c | 92 ------------
fs/btrfs/subvolume.c | 130 -----------------
14 files changed, 3 insertions(+), 1378 deletions(-)
delete mode 100644 fs/btrfs/chunk-map.c
delete mode 100644 fs/btrfs/root.c
delete mode 100644 fs/btrfs/subvolume.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 3cf8a716f8c0..be03bf11efe1 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -2,6 +2,6 @@
#
# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
-obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
+obj-y := btrfs.o compression.o ctree.o dev.o dir-item.o \
+ extent-io.o inode.o crypto/hash.o disk-io.o \
common/rbtree-utils.o extent-cache.o extent-io.o volumes.o root-tree.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 023268152319..f924d08b1e67 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -12,7 +12,6 @@
#include "crypto/hash.h"
#include "disk-io.h"
-struct btrfs_info btrfs_info;
struct btrfs_fs_info *current_fs_info;
static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
@@ -118,36 +117,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
struct btrfs_fs_info *fs_info;
int ret = -1;
- btrfs_blk_desc = fs_dev_desc;
- btrfs_part_info = fs_partition;
-
- memset(&btrfs_info, 0, sizeof(btrfs_info));
-
btrfs_hash_init();
- if (btrfs_read_superblock())
- return -1;
-
- if (btrfs_chunk_map_init()) {
- printf("%s: failed to init chunk map\n", __func__);
- return -1;
- }
-
- btrfs_info.tree_root.objectid = 0;
- btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
- btrfs_info.chunk_root.objectid = 0;
- btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
-
- if (__btrfs_read_chunk_tree()) {
- printf("%s: failed to read chunk tree\n", __func__);
- return -1;
- }
-
- if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
- &btrfs_info.fs_root, NULL)) {
- printf("%s: failed to find default subvolume\n", __func__);
- return -1;
- }
-
fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
if (fs_info) {
current_fs_info = fs_info;
@@ -295,7 +265,6 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
void btrfs_close(void)
{
- btrfs_chunk_map_exit();
if (current_fs_info) {
close_ctree_fs_info(current_fs_info);
current_fs_info = NULL;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 6963e5ac447e..7d8b395b2646 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -11,65 +11,18 @@
#include <linux/rbtree.h>
#include "conv-funcs.h"
-struct btrfs_info {
- struct btrfs_super_block sb;
-
- struct __btrfs_root tree_root;
- struct __btrfs_root fs_root;
- struct __btrfs_root chunk_root;
-
- struct rb_root chunks_root;
-};
-
extern struct btrfs_info btrfs_info;
extern struct btrfs_fs_info *current_fs_info;
-/* dev.c */
-extern struct blk_desc *btrfs_blk_desc;
-extern disk_partition_t *btrfs_part_info;
-
-int btrfs_devread(u64, int, void *);
-
-/* chunk-map.c */
-u64 btrfs_map_logical_to_physical(u64);
-int btrfs_chunk_map_init(void);
-void btrfs_chunk_map_exit(void);
-int __btrfs_read_chunk_tree(void);
-
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
-/* super.c */
-int btrfs_read_superblock(void);
-
-/* dir-item.c */
-int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
- struct btrfs_dir_item *);
-/* root.c */
-int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
-u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
-
/* inode.c */
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
- char *);
-int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
- struct btrfs_inode_item *, struct __btrfs_root *);
-int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
-u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
- struct btrfs_inode_item *, int);
-u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
-/* extent-io.c */
-u64 __btrfs_read_extent_inline(struct __btrfs_path *,
- struct btrfs_file_extent_item *, u64, u64,
- char *);
-u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
- u64, u64, char *);
-
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
deleted file mode 100644
index 49d8835e14e9..000000000000
--- a/fs/btrfs/chunk-map.c
+++ /dev/null
@@ -1,177 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-#include <malloc.h>
-
-struct chunk_map_item {
- struct rb_node node;
- u64 logical;
- u64 length;
- u64 physical;
-};
-
-static int add_chunk_mapping(struct btrfs_key *key, struct btrfs_chunk *chunk)
-{
- struct btrfs_stripe *stripe;
- u64 block_profile = chunk->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
- struct rb_node **new = &(btrfs_info.chunks_root.rb_node), *prnt = NULL;
- struct chunk_map_item *map_item;
-
- if (block_profile && block_profile != BTRFS_BLOCK_GROUP_DUP) {
- printf("%s: unsupported chunk profile %llu\n", __func__,
- block_profile);
- return -1;
- } else if (!chunk->length) {
- printf("%s: zero length chunk\n", __func__);
- return -1;
- }
-
- stripe = &chunk->stripe;
- btrfs_stripe_to_cpu(stripe);
-
- while (*new) {
- struct chunk_map_item *this;
-
- this = rb_entry(*new, struct chunk_map_item, node);
-
- prnt = *new;
- if (key->offset < this->logical) {
- new = &((*new)->rb_left);
- } else if (key->offset > this->logical) {
- new = &((*new)->rb_right);
- } else {
- debug("%s: Logical address %llu already in map!\n",
- __func__, key->offset);
- return 0;
- }
- }
-
- map_item = malloc(sizeof(struct chunk_map_item));
- if (!map_item)
- return -1;
-
- map_item->logical = key->offset;
- map_item->length = chunk->length;
- map_item->physical = le64_to_cpu(chunk->stripe.offset);
- rb_link_node(&map_item->node, prnt, new);
- rb_insert_color(&map_item->node, &btrfs_info.chunks_root);
-
- debug("%s: Mapping %llu to %llu\n", __func__, map_item->logical,
- map_item->physical);
-
- return 0;
-}
-
-u64 btrfs_map_logical_to_physical(u64 logical)
-{
- struct rb_node *node = btrfs_info.chunks_root.rb_node;
-
- while (node) {
- struct chunk_map_item *item;
-
- item = rb_entry(node, struct chunk_map_item, node);
-
- if (item->logical > logical)
- node = node->rb_left;
- else if (logical >= item->logical + item->length)
- node = node->rb_right;
- else
- return item->physical + logical - item->logical;
- }
-
- printf("%s: Cannot map logical address %llu to physical\n", __func__,
- logical);
-
- return -1ULL;
-}
-
-void btrfs_chunk_map_exit(void)
-{
- struct rb_node *now, *next;
- struct chunk_map_item *item;
-
- for (now = rb_first_postorder(&btrfs_info.chunks_root); now; now = next)
- {
- item = rb_entry(now, struct chunk_map_item, node);
- next = rb_next_postorder(now);
- free(item);
- }
-}
-
-int btrfs_chunk_map_init(void)
-{
- u8 sys_chunk_array_copy[sizeof(btrfs_info.sb.sys_chunk_array)];
- u8 * const start = sys_chunk_array_copy;
- u8 * const end = start + btrfs_info.sb.sys_chunk_array_size;
- u8 *cur;
- struct btrfs_key *key;
- struct btrfs_chunk *chunk;
-
- btrfs_info.chunks_root = RB_ROOT;
-
- memcpy(sys_chunk_array_copy, btrfs_info.sb.sys_chunk_array,
- sizeof(sys_chunk_array_copy));
-
- for (cur = start; cur < end;) {
- key = (struct btrfs_key *) cur;
- cur += sizeof(struct btrfs_key);
- chunk = (struct btrfs_chunk *) cur;
-
- btrfs_key_to_cpu(key);
- btrfs_chunk_to_cpu(chunk);
-
- if (key->type != BTRFS_CHUNK_ITEM_KEY) {
- printf("%s: invalid key type %u\n", __func__,
- key->type);
- return -1;
- }
-
- if (add_chunk_mapping(key, chunk))
- return -1;
-
- cur += sizeof(struct btrfs_chunk);
- cur += sizeof(struct btrfs_stripe) * (chunk->num_stripes - 1);
- }
-
- return 0;
-}
-
-int __btrfs_read_chunk_tree(void)
-{
- struct __btrfs_path path;
- struct btrfs_key key, *found_key;
- struct btrfs_chunk *chunk;
- int res = 0;
-
- key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
- key.type = BTRFS_CHUNK_ITEM_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.chunk_root, &key, &path))
- return -1;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- continue;
-
- chunk = btrfs_path_item_ptr(&path, struct btrfs_chunk);
- btrfs_chunk_to_cpu(chunk);
- if (add_chunk_mapping(found_key, chunk)) {
- res = -1;
- break;
- }
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-
- if (res < 0)
- return -1;
-
- return 0;
-}
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 346875d45a1b..987299639060 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -94,7 +94,7 @@ static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
while (stream.total_in < clen) {
stream.next_in = cbuf + stream.total_in;
stream.avail_in = min((u32) (clen - stream.total_in),
- (u32) btrfs_info.sb.sectorsize);
+ current_fs_info->sectorsize);
ret = inflate(&stream, Z_NO_FLUSH);
if (ret != Z_OK)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 20c68a154d14..c5ac84599e75 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -69,296 +69,6 @@ void btrfs_release_path(struct btrfs_path *p)
memset(p, 0, sizeof(*p));
}
-int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- if (a->offset > b->offset)
- return 1;
- if (a->offset < b->offset)
- return -1;
- return 0;
-}
-
-int btrfs_comp_keys_type(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- return 0;
-}
-
-/*
- * search for key in the extent_buffer. The items start at offset p,
- * and they are item_size apart. There are 'max' items in p.
- *
- * the slot in the array is returned via slot, and it points to
- * the place where you would insert key if it is not found in
- * the array.
- *
- * slot may point to max if the key is bigger than all of the keys
- */
-static int __generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
- int max, int *slot)
-{
- int low = 0, high = max, mid, ret;
- struct btrfs_key *tmp;
-
- while (low < high) {
- mid = (low + high) / 2;
-
- tmp = (struct btrfs_key *) ((u8 *) addr + mid*item_size);
- ret = __btrfs_comp_keys(tmp, key);
-
- if (ret < 0) {
- low = mid + 1;
- } else if (ret > 0) {
- high = mid;
- } else {
- *slot = mid;
- return 0;
- }
- }
-
- *slot = low;
- return 1;
-}
-
-int __btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
- int *slot)
-{
- void *addr;
- unsigned long size;
-
- if (p->header.level) {
- addr = p->node.ptrs;
- size = sizeof(struct btrfs_key_ptr);
- } else {
- addr = p->leaf.items;
- size = sizeof(struct btrfs_item);
- }
-
- return __generic_bin_search(addr, size, key, p->header.nritems, slot);
-}
-
-static void clear_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- p->nodes[i] = NULL;
- p->slots[i] = 0;
- }
-}
-
-void __btrfs_free_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- if (p->nodes[i])
- free(p->nodes[i]);
- }
-
- clear_path(p);
-}
-
-static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
-{
- ALLOC_CACHE_ALIGN_BUFFER(struct btrfs_header, hdr,
- sizeof(struct btrfs_header));
- unsigned long size, offset = sizeof(*hdr);
- union btrfs_tree_node *res;
- u32 i;
-
- if (!btrfs_devread(physical, sizeof(*hdr), hdr))
- return -1;
-
- btrfs_header_to_cpu(hdr);
-
- if (hdr->level)
- size = sizeof(struct btrfs_node)
- + hdr->nritems * sizeof(struct btrfs_key_ptr);
- else
- size = btrfs_info.sb.nodesize;
-
- res = malloc_cache_aligned(size);
- if (!res) {
- debug("%s: malloc failed\n", __func__);
- return -1;
- }
-
- if (!btrfs_devread(physical + offset, size - offset,
- ((u8 *) res) + offset)) {
- free(res);
- return -1;
- }
-
- memcpy(&res->header, hdr, sizeof(*hdr));
- if (hdr->level)
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_key_ptr_to_cpu(&res->node.ptrs[i]);
- else
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_item_to_cpu(&res->leaf.items[i]);
-
- *buf = res;
-
- return 0;
-}
-
-int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
- struct __btrfs_path *p)
-{
- u8 lvl, prev_lvl;
- int i, slot, ret;
- u64 logical, physical;
- union btrfs_tree_node *buf;
-
- clear_path(p);
-
- logical = root->bytenr;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &buf))
- goto err;
-
- lvl = buf->header.level;
- if (i && prev_lvl != lvl + 1) {
- printf("%s: invalid level in header at %llu\n",
- __func__, logical);
- goto err;
- }
- prev_lvl = lvl;
-
- ret = __btrfs_bin_search(buf, key, &slot);
- if (ret < 0)
- goto err;
- if (ret && slot > 0 && lvl)
- slot -= 1;
-
- p->slots[lvl] = slot;
- p->nodes[lvl] = buf;
-
- if (lvl) {
- logical = buf->node.ptrs[slot].blockptr;
- } else {
- /*
- * The path might be invalid if:
- * cur leaf max < searched value < next leaf min
- *
- * Jump to the next valid element if it exists.
- */
- if (slot >= buf->header.nritems)
- if (btrfs_next_slot(p) < 0)
- goto err;
- break;
- }
- }
-
- return 0;
-err:
- __btrfs_free_path(p);
- return -1;
-}
-
-static int jump_leaf(struct __btrfs_path *path, int dir)
-{
- struct __btrfs_path p;
- u32 slot;
- int level = 1, from_level, i;
-
- dir = dir >= 0 ? 1 : -1;
-
- p = *path;
-
- while (level < BTRFS_MAX_LEVEL) {
- if (!p.nodes[level])
- return 1;
-
- slot = p.slots[level];
- if ((dir > 0 && slot + dir >= p.nodes[level]->header.nritems)
- || (dir < 0 && !slot))
- level++;
- else
- break;
- }
-
- if (level == BTRFS_MAX_LEVEL)
- return 1;
-
- p.slots[level] = slot + dir;
- level--;
- from_level = level;
-
- while (level >= 0) {
- u64 logical, physical;
-
- slot = p.slots[level + 1];
- logical = p.nodes[level + 1]->node.ptrs[slot].blockptr;
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &p.nodes[level]))
- goto err;
-
- if (dir > 0)
- p.slots[level] = 0;
- else
- p.slots[level] = p.nodes[level]->header.nritems - 1;
- level--;
- }
-
- /* Free rewritten nodes in path */
- for (i = 0; i <= from_level; ++i)
- free(path->nodes[i]);
-
- *path = p;
- return 0;
-
-err:
- /* Free rewritten nodes in p */
- for (i = level + 1; i <= from_level; ++i)
- free(p.nodes[i]);
- return -1;
-}
-
-int btrfs_prev_slot(struct __btrfs_path *p)
-{
- if (!p->slots[0])
- return jump_leaf(p, -1);
-
- p->slots[0]--;
- return 0;
-}
-
-int btrfs_next_slot(struct __btrfs_path *p)
-{
- struct btrfs_leaf *leaf = &p->nodes[0]->leaf;
-
- if (p->slots[0] + 1 >= leaf->header.nritems)
- return jump_leaf(p, 1);
-
- p->slots[0]++;
- return 0;
-}
-
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
{
if (k1->objectid > k2->objectid)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 602f99b5e593..3f794a7430e1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1203,69 +1203,6 @@ union btrfs_tree_node {
struct btrfs_node node;
};
-struct __btrfs_path {
- union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
- u32 slots[BTRFS_MAX_LEVEL];
-};
-
-struct __btrfs_root {
- u64 objectid;
- u64 bytenr;
- u64 root_dirid;
-};
-
-int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
-int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int __btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void __btrfs_free_path(struct __btrfs_path *);
-int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
- struct __btrfs_path *);
-int btrfs_prev_slot(struct __btrfs_path *);
-int btrfs_next_slot(struct __btrfs_path *);
-
-static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
- /* At tree read time we have converted the endian for btrfs_disk_key */
- return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
-}
-
-static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct __btrfs_root *root, u64 objectid,
- u8 type, struct __btrfs_path *path)
-{
- struct btrfs_key key, *res;
-
- key.objectid = objectid;
- key.type = type;
- key.offset = 0;
-
- if (btrfs_search_tree(root, &key, path))
- return NULL;
-
- res = btrfs_path_leaf_key(path);
- if (btrfs_comp_keys_type(&key, res)) {
- __btrfs_free_path(path);
- return NULL;
- }
-
- return res;
-}
-
-static inline u32 btrfs_path_item_size(struct __btrfs_path *p)
-{
- return p->nodes[0]->leaf.items[p->slots[0]].size;
-}
-
-static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
-{
- return ((u8 *) leaf) + sizeof(struct btrfs_header)
- + leaf->items[slot].offset;
-}
-
-static inline void *btrfs_path_leaf_data(struct __btrfs_path *p)
-{
- return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
-}
-
#define btrfs_path_item_ptr(p,t) \
((t *) btrfs_path_leaf_data((p)))
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index a6c66a021896..3224290b682a 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -114,85 +114,6 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
return btrfs_match_dir_item_name(root, path, name, name_len);
}
-static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
-{
- u16 max_len = BTRFS_NAME_LEN;
- u32 end;
-
- if (item->type >= BTRFS_FT_MAX) {
- printf("%s: invalid dir item type: %i\n", __func__, item->type);
- return 1;
- }
-
- if (item->type == BTRFS_FT_XATTR)
- max_len = 255; /* XATTR_NAME_MAX */
-
- end = start + sizeof(*item) + item->name_len;
- if (item->name_len > max_len || end > total) {
- printf("%s: invalid dir item name len: %u\n", __func__,
- item->name_len);
- return 1;
- }
-
- return 0;
-}
-
-static struct btrfs_dir_item *
-__btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
- int name_len)
-{
- struct btrfs_dir_item *item;
- u32 total_len, cur = 0, this_len;
- const char *name_ptr;
-
- item = btrfs_path_item_ptr(path, struct btrfs_dir_item);
-
- total_len = btrfs_path_item_size(path);
-
- while (cur < total_len) {
- btrfs_dir_item_to_cpu(item);
- this_len = sizeof(*item) + item->name_len + item->data_len;
- name_ptr = (const char *) (item + 1);
-
- if (__verify_dir_item(item, cur, total_len))
- return NULL;
- if (item->name_len == name_len && !memcmp(name_ptr, name,
- name_len))
- return item;
-
- cur += this_len;
- item = (struct btrfs_dir_item *) ((u8 *) item + this_len);
- }
-
- return NULL;
-}
-
-int __btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
- const char *name, int name_len,
- struct btrfs_dir_item *item)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_dir_item *res = NULL;
-
- key.objectid = dir;
- key.type = BTRFS_DIR_ITEM_KEY;
- key.offset = btrfs_name_hash(name, name_len);
-
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
-
- res = __btrfs_match_dir_item_name(&path, name, name_len);
- if (res)
- *item = *res;
-out:
- __btrfs_free_path(&path);
- return res ? 0 : -1;
-}
-
int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
btrfs_iter_dir_callback_t callback)
{
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index be2c26d323f6..48d4fb56d954 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -310,36 +310,6 @@ int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
return 0;
}
-int btrfs_read_superblock(void)
-{
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- int ret;
-
-
- btrfs_info.sb.generation = 0;
-
- ret = btrfs_read_dev_super(btrfs_blk_desc, btrfs_part_info, sb);
- if (ret < 0) {
- debug("%s: No valid BTRFS superblock found!\n", __func__);
- return ret;
- }
- btrfs_super_block_to_cpu(sb);
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
-
static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
int verify, int silent, u16 csum_type)
{
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 7c321d842561..c3eae240b47c 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -10,9 +10,6 @@
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-/* U-boot specific */
-int btrfs_read_superblock(void);
-
/* From btrfs-progs */
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 2af710f0dd32..d4321cba3a1e 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,116 +13,6 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 __btrfs_read_extent_inline(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u32 clen, dlen, orig_size = size, res;
- const char *cbuf;
- char *dbuf;
- const int data_off = offsetof(struct btrfs_file_extent_item,
- disk_bytenr);
-
- clen = btrfs_path_item_size(path) - data_off;
- cbuf = (const char *) extent + data_off;
- dlen = extent->ram_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- memcpy(out, cbuf + offset, size);
- return size;
- }
-
- if (dlen > orig_size) {
- dbuf = malloc(dlen);
- if (!dbuf)
- return -1ULL;
- } else {
- dbuf = out;
- }
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1 || res != dlen)
- goto err;
-
- if (dlen > orig_size) {
- memcpy(out, dbuf + offset, size);
- free(dbuf);
- } else if (offset) {
- memmove(out, dbuf + offset, size);
- }
-
- return size;
-
-err:
- if (dlen > orig_size)
- free(dbuf);
- return -1ULL;
-}
-
-u64 __btrfs_read_extent_reg(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u64 physical, clen, dlen, orig_size = size;
- u32 res;
- char *cbuf, *dbuf;
-
- clen = extent->disk_num_bytes;
- dlen = extent->num_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
- if (physical == -1ULL)
- return -1ULL;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- physical += extent->offset + offset;
- if (!btrfs_devread(physical, size, out))
- return -1ULL;
-
- return size;
- }
-
- cbuf = malloc_cache_aligned(dlen > size ? clen + dlen : clen);
- if (!cbuf)
- return -1ULL;
-
- if (dlen > orig_size)
- dbuf = cbuf + clen;
- else
- dbuf = out;
-
- if (!btrfs_devread(physical, clen, cbuf))
- goto err;
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1)
- goto err;
-
- if (dlen > orig_size)
- memcpy(out, dbuf + offset, size);
- else
- memmove(out, dbuf + offset, size);
-
- free(cbuf);
- return res;
-
-err:
- free(cbuf);
- return -1ULL;
-}
-
void extent_io_tree_init(struct extent_io_tree *tree)
{
cache_tree_init(&tree->state);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index faa8e3dbb76a..53e2cbef7176 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -12,81 +12,6 @@
#include "disk-io.h"
#include "volumes.h"
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_inode_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(root, inr, BTRFS_INODE_REF_KEY,
- &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_inode_ref);
- btrfs_inode_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: inode name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
-int __btrfs_lookup_inode(const struct __btrfs_root *root,
- struct btrfs_key *location,
- struct btrfs_inode_item *item,
- struct __btrfs_root *new_root)
-{
- struct __btrfs_root tmp_root = *root;
- struct __btrfs_path path;
- int res = -1;
-
- if (location->type == BTRFS_ROOT_ITEM_KEY) {
- if (btrfs_find_root(location->objectid, &tmp_root, NULL))
- return -1;
-
- location->objectid = tmp_root.root_dirid;
- location->type = BTRFS_INODE_ITEM_KEY;
- location->offset = 0;
- }
-
- if (btrfs_search_tree(&tmp_root, location, &path))
- return res;
-
- if (__btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
- goto out;
-
- if (item) {
- *item = *btrfs_path_item_ptr(&path, struct btrfs_inode_item);
- btrfs_inode_item_to_cpu(item);
- }
-
- if (new_root)
- *new_root = tmp_root;
-
- res = 0;
-
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
/*
* Read the content of symlink inode @ino of @root, into @target.
*
@@ -142,28 +67,6 @@ out:
return ret;
}
-int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
-{
- struct btrfs_root *subvolume;
- struct btrfs_fs_info *fs_info = current_fs_info;
- struct btrfs_key key;
- int ret;
-
- ASSERT(fs_info);
- key.objectid = root->objectid;
- key.type = BTRFS_ROOT_ITEM_KEY;
- key.offset = (u64)-1;
- subvolume = btrfs_read_fs_root(fs_info, &key);
- if (IS_ERR(subvolume))
- return -1;
-
- ret = btrfs_readlink(subvolume, inr, target);
- if (ret < 0)
- return -1;
- target[ret] = '\0';
- return 0;
-}
-
static int lookup_root_ref(struct btrfs_fs_info *fs_info,
u64 rootid, u64 *root_ret, u64 *dir_ret)
{
@@ -273,58 +176,6 @@ out:
return ret;
}
-/* inr must be a directory (for regular files with multiple hard links this
- function returns only one of the parents of the file) */
-static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_item *inode_item)
-{
- struct btrfs_key key;
- u64 res;
-
- if (inr == BTRFS_FIRST_FREE_OBJECTID) {
- if (root->objectid != btrfs_info.fs_root.objectid) {
- u64 parent;
- struct btrfs_root_ref ref;
-
- parent = btrfs_lookup_root_ref(root->objectid, &ref,
- NULL);
- if (parent == -1ULL)
- return -1ULL;
-
- if (btrfs_find_root(parent, root, NULL))
- return -1ULL;
-
- inr = ref.dirid;
- }
-
- if (inode_item) {
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return inr;
- }
-
- res = __btrfs_lookup_inode_ref(root, inr, NULL, NULL);
- if (res == -1ULL)
- return -1ULL;
-
- if (inode_item) {
- key.objectid = res;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return res;
-}
-
static inline int next_length(const char *path)
{
int res = 0;
@@ -482,180 +333,6 @@ next:
return ret;
}
-u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
- u8 *type_p, struct btrfs_inode_item *inode_item_p,
- int symlink_limit)
-{
- struct btrfs_dir_item item;
- struct btrfs_inode_item inode_item;
- u8 type = BTRFS_FT_DIR;
- int len, have_inode = 0;
- const char *cur = path;
-
- if (*cur == '/') {
- ++cur;
- inr = root->root_dirid;
- }
-
- do {
- cur = skip_current_directories(cur);
-
- len = next_length(cur);
- if (len > BTRFS_NAME_LEN) {
- printf("%s: Name too long at \"%.*s\"\n", __func__,
- BTRFS_NAME_LEN, cur);
- return -1ULL;
- }
-
- if (len == 1 && cur[0] == '.')
- break;
-
- if (len == 2 && cur[0] == '.' && cur[1] == '.') {
- cur += 2;
- inr = __get_parent_inode(root, inr, &inode_item);
- if (inr == -1ULL)
- return -1ULL;
-
- type = BTRFS_FT_DIR;
- continue;
- }
-
- if (!*cur)
- break;
-
- if (__btrfs_lookup_dir_item(root, inr, cur, len, &item))
- return -1ULL;
-
- type = item.type;
- have_inode = 1;
- if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
- &inode_item, root))
- return -1ULL;
-
- if (item.type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
- char *target;
-
- if (!symlink_limit) {
- printf("%s: Too much symlinks!\n", __func__);
- return -1ULL;
- }
-
- target = malloc(min(inode_item.size + 1,
- (u64) btrfs_info.sb.sectorsize));
- if (!target)
- return -1ULL;
-
- if (__btrfs_readlink(root, item.location.objectid,
- target)) {
- free(target);
- return -1ULL;
- }
-
- inr = __btrfs_lookup_path(root, inr, target, &type,
- &inode_item, symlink_limit - 1);
-
- free(target);
-
- if (inr == -1ULL)
- return -1ULL;
- } else if (item.type != BTRFS_FT_DIR && cur[len]) {
- printf("%s: \"%.*s\" not a directory\n", __func__,
- (int) (cur - path + len), path);
- return -1ULL;
- } else {
- inr = item.location.objectid;
- }
-
- cur += len;
- } while (*cur);
-
- if (type_p)
- *type_p = type;
-
- if (inode_item_p) {
- if (!have_inode) {
- struct btrfs_key key;
-
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, &inode_item, NULL))
- return -1ULL;
- }
-
- *inode_item_p = inode_item;
- }
-
- return inr;
-}
-
-u64 __btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
- u64 size, char *buf)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_file_extent_item *extent;
- int res = 0;
- u64 rd, rd_all = -1ULL;
-
- key.objectid = inr;
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = offset;
-
- if (btrfs_search_tree(root, &key, &path))
- return -1ULL;
-
- if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
- if (btrfs_prev_slot(&path))
- goto out;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
- }
-
- rd_all = 0;
-
- do {
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- break;
-
- extent = btrfs_path_item_ptr(&path,
- struct btrfs_file_extent_item);
-
- if (extent->type == BTRFS_FILE_EXTENT_INLINE) {
- btrfs_file_extent_item_to_cpu_inl(extent);
- rd = __btrfs_read_extent_inline(&path, extent, offset,
- size, buf);
- } else {
- btrfs_file_extent_item_to_cpu(extent);
- rd = __btrfs_read_extent_reg(&path, extent, offset, size,
- buf);
- }
-
- if (rd == -1ULL) {
- printf("%s: Error reading extent\n", __func__);
- rd_all = -1;
- goto out;
- }
-
- offset = 0;
- buf += rd;
- rd_all += rd;
- size -= rd;
-
- if (!size)
- break;
- } while (!(res = btrfs_next_slot(&path)));
-
- if (res)
- return -1ULL;
-
-out:
- __btrfs_free_path(&path);
- return rd_all;
-}
-
/*
* Read out inline extent.
*
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
deleted file mode 100644
index a424966df61e..000000000000
--- a/fs/btrfs/root.c
+++ /dev/null
@@ -1,92 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-
-static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
-{
- u32 len;
- int reset = 0;
-
- len = btrfs_path_item_size(p);
- memcpy(item, btrfs_path_item_ptr(p, struct btrfs_root_item), len);
- btrfs_root_item_to_cpu(item);
-
- if (len < sizeof(*item))
- reset = 1;
- if (!reset && item->generation != item->generation_v2) {
- if (item->generation_v2 != 0)
- printf("%s: generation != generation_v2 in root item",
- __func__);
- reset = 1;
- }
- if (reset) {
- memset(&item->generation_v2, 0,
- sizeof(*item) - offsetof(struct btrfs_root_item,
- generation_v2));
- }
-}
-
-int btrfs_find_root(u64 objectid, struct __btrfs_root *root,
- struct btrfs_root_item *root_item)
-{
- struct __btrfs_path path;
- struct btrfs_root_item my_root_item;
-
- if (!btrfs_search_tree_key_type(&btrfs_info.tree_root, objectid,
- BTRFS_ROOT_ITEM_KEY, &path))
- return -1;
-
- if (!root_item)
- root_item = &my_root_item;
- read_root_item(&path, root_item);
-
- if (root) {
- root->objectid = objectid;
- root->bytenr = root_item->bytenr;
- root->root_dirid = root_item->root_dirid;
- }
-
- __btrfs_free_path(&path);
- return 0;
-}
-
-u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_root_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(&btrfs_info.tree_root, subvolid,
- BTRFS_ROOT_BACKREF_KEY, &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: volume name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
deleted file mode 100644
index 0e72577d0df5..000000000000
--- a/fs/btrfs/subvolume.c
+++ /dev/null
@@ -1,130 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include "btrfs.h"
-#include <malloc.h>
-
-static int get_subvol_name(u64 subvolid, char *name, int max_len)
-{
- struct btrfs_root_ref rref;
- struct btrfs_inode_ref iref;
- struct __btrfs_root root;
- u64 dir;
- char tmp[BTRFS_NAME_LEN];
- char *ptr;
-
- ptr = name + max_len - 1;
- *ptr = '\0';
-
- while (subvolid != BTRFS_FS_TREE_OBJECTID) {
- subvolid = btrfs_lookup_root_ref(subvolid, &rref, tmp);
-
- if (subvolid == -1ULL)
- return -1;
-
- ptr -= rref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, rref.name_len);
- *ptr = '/';
-
- if (btrfs_find_root(subvolid, &root, NULL))
- return -1;
-
- dir = rref.dirid;
-
- while (dir != BTRFS_FIRST_FREE_OBJECTID) {
- dir = __btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
-
- if (dir == -1ULL)
- return -1;
-
- ptr -= iref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, iref.name_len);
- *ptr = '/';
- }
- }
-
- if (ptr == name + max_len - 1) {
- name[0] = '/';
- name[1] = '\0';
- } else {
- memmove(name, ptr, name + max_len - ptr);
- }
-
- return 0;
-
-too_long:
- printf("%s: subvolume name too long\n", __func__);
- return -1;
-}
-
-u64 btrfs_get_default_subvol_objectid(void)
-{
- struct btrfs_dir_item item;
-
- if (__btrfs_lookup_dir_item(&btrfs_info.tree_root,
- btrfs_info.sb.root_dir_objectid, "default", 7,
- &item))
- return BTRFS_FS_TREE_OBJECTID;
- return item.location.objectid;
-}
-
-static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
-{
- struct btrfs_key key, *found_key;
- struct __btrfs_path path;
- struct btrfs_root_ref *ref;
- int res;
-
- key.objectid = tree;
- key.type = BTRFS_ROOT_REF_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.tree_root, &key, &path))
- return;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- break;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- printf("ID %llu parent %llu name ", found_key->offset, tree);
- if (nameptr && !get_subvol_name(found_key->offset, nameptr,
- max_name_len))
- printf("%s\n", nameptr);
- else
- printf("%.*s\n", (int) ref->name_len,
- (const char *) (ref + 1));
-
- if (level > 0)
- list_subvols(found_key->offset, nameptr, max_name_len,
- level - 1);
- else
- printf("%s: Too much recursion, maybe skipping some "
- "subvolumes\n", __func__);
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-}
-
-void btrfs_list_subvols(void)
-{
- char *nameptr = malloc(4096);
-
- list_subvols(BTRFS_FS_TREE_OBJECTID, nameptr, nameptr ? 4096 : 0, 40);
-
- if (nameptr)
- free(nameptr);
-}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 25/26] fs: btrfs: Cleanup the old implementation
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/Makefile | 4 +-
fs/btrfs/btrfs.c | 31 ----
fs/btrfs/btrfs.h | 47 ------
fs/btrfs/chunk-map.c | 177 ----------------------
fs/btrfs/compression.c | 2 +-
fs/btrfs/ctree.c | 290 ------------------------------------
fs/btrfs/ctree.h | 63 --------
fs/btrfs/dir-item.c | 79 ----------
fs/btrfs/disk-io.c | 30 ----
fs/btrfs/disk-io.h | 3 -
fs/btrfs/extent-io.c | 110 --------------
fs/btrfs/inode.c | 323 -----------------------------------------
fs/btrfs/root.c | 92 ------------
fs/btrfs/subvolume.c | 130 -----------------
14 files changed, 3 insertions(+), 1378 deletions(-)
delete mode 100644 fs/btrfs/chunk-map.c
delete mode 100644 fs/btrfs/root.c
delete mode 100644 fs/btrfs/subvolume.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index 3cf8a716f8c0..be03bf11efe1 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -2,6 +2,6 @@
#
# 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
-obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
- extent-io.o inode.o root.o subvolume.o crypto/hash.o disk-io.o \
+obj-y := btrfs.o compression.o ctree.o dev.o dir-item.o \
+ extent-io.o inode.o crypto/hash.o disk-io.o \
common/rbtree-utils.o extent-cache.o extent-io.o volumes.o root-tree.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
index 023268152319..f924d08b1e67 100644
--- a/fs/btrfs/btrfs.c
+++ b/fs/btrfs/btrfs.c
@@ -12,7 +12,6 @@
#include "crypto/hash.h"
#include "disk-io.h"
-struct btrfs_info btrfs_info;
struct btrfs_fs_info *current_fs_info;
static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
@@ -118,36 +117,7 @@ int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
struct btrfs_fs_info *fs_info;
int ret = -1;
- btrfs_blk_desc = fs_dev_desc;
- btrfs_part_info = fs_partition;
-
- memset(&btrfs_info, 0, sizeof(btrfs_info));
-
btrfs_hash_init();
- if (btrfs_read_superblock())
- return -1;
-
- if (btrfs_chunk_map_init()) {
- printf("%s: failed to init chunk map\n", __func__);
- return -1;
- }
-
- btrfs_info.tree_root.objectid = 0;
- btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
- btrfs_info.chunk_root.objectid = 0;
- btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
-
- if (__btrfs_read_chunk_tree()) {
- printf("%s: failed to read chunk tree\n", __func__);
- return -1;
- }
-
- if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
- &btrfs_info.fs_root, NULL)) {
- printf("%s: failed to find default subvolume\n", __func__);
- return -1;
- }
-
fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
if (fs_info) {
current_fs_info = fs_info;
@@ -295,7 +265,6 @@ int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
void btrfs_close(void)
{
- btrfs_chunk_map_exit();
if (current_fs_info) {
close_ctree_fs_info(current_fs_info);
current_fs_info = NULL;
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 6963e5ac447e..7d8b395b2646 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -11,65 +11,18 @@
#include <linux/rbtree.h>
#include "conv-funcs.h"
-struct btrfs_info {
- struct btrfs_super_block sb;
-
- struct __btrfs_root tree_root;
- struct __btrfs_root fs_root;
- struct __btrfs_root chunk_root;
-
- struct rb_root chunks_root;
-};
-
extern struct btrfs_info btrfs_info;
extern struct btrfs_fs_info *current_fs_info;
-/* dev.c */
-extern struct blk_desc *btrfs_blk_desc;
-extern disk_partition_t *btrfs_part_info;
-
-int btrfs_devread(u64, int, void *);
-
-/* chunk-map.c */
-u64 btrfs_map_logical_to_physical(u64);
-int btrfs_chunk_map_init(void);
-void btrfs_chunk_map_exit(void);
-int __btrfs_read_chunk_tree(void);
-
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
-/* super.c */
-int btrfs_read_superblock(void);
-
-/* dir-item.c */
-int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
- struct btrfs_dir_item *);
-/* root.c */
-int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
-u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
-
/* inode.c */
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
- char *);
-int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
- struct btrfs_inode_item *, struct __btrfs_root *);
-int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
-u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
- struct btrfs_inode_item *, int);
-u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
-/* extent-io.c */
-u64 __btrfs_read_extent_inline(struct __btrfs_path *,
- struct btrfs_file_extent_item *, u64, u64,
- char *);
-u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
- u64, u64, char *);
-
#endif /* !__BTRFS_BTRFS_H__ */
diff --git a/fs/btrfs/chunk-map.c b/fs/btrfs/chunk-map.c
deleted file mode 100644
index 49d8835e14e9..000000000000
--- a/fs/btrfs/chunk-map.c
+++ /dev/null
@@ -1,177 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
- */
-
-#include "btrfs.h"
-#include <malloc.h>
-
-struct chunk_map_item {
- struct rb_node node;
- u64 logical;
- u64 length;
- u64 physical;
-};
-
-static int add_chunk_mapping(struct btrfs_key *key, struct btrfs_chunk *chunk)
-{
- struct btrfs_stripe *stripe;
- u64 block_profile = chunk->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
- struct rb_node **new = &(btrfs_info.chunks_root.rb_node), *prnt = NULL;
- struct chunk_map_item *map_item;
-
- if (block_profile && block_profile != BTRFS_BLOCK_GROUP_DUP) {
- printf("%s: unsupported chunk profile %llu\n", __func__,
- block_profile);
- return -1;
- } else if (!chunk->length) {
- printf("%s: zero length chunk\n", __func__);
- return -1;
- }
-
- stripe = &chunk->stripe;
- btrfs_stripe_to_cpu(stripe);
-
- while (*new) {
- struct chunk_map_item *this;
-
- this = rb_entry(*new, struct chunk_map_item, node);
-
- prnt = *new;
- if (key->offset < this->logical) {
- new = &((*new)->rb_left);
- } else if (key->offset > this->logical) {
- new = &((*new)->rb_right);
- } else {
- debug("%s: Logical address %llu already in map!\n",
- __func__, key->offset);
- return 0;
- }
- }
-
- map_item = malloc(sizeof(struct chunk_map_item));
- if (!map_item)
- return -1;
-
- map_item->logical = key->offset;
- map_item->length = chunk->length;
- map_item->physical = le64_to_cpu(chunk->stripe.offset);
- rb_link_node(&map_item->node, prnt, new);
- rb_insert_color(&map_item->node, &btrfs_info.chunks_root);
-
- debug("%s: Mapping %llu to %llu\n", __func__, map_item->logical,
- map_item->physical);
-
- return 0;
-}
-
-u64 btrfs_map_logical_to_physical(u64 logical)
-{
- struct rb_node *node = btrfs_info.chunks_root.rb_node;
-
- while (node) {
- struct chunk_map_item *item;
-
- item = rb_entry(node, struct chunk_map_item, node);
-
- if (item->logical > logical)
- node = node->rb_left;
- else if (logical >= item->logical + item->length)
- node = node->rb_right;
- else
- return item->physical + logical - item->logical;
- }
-
- printf("%s: Cannot map logical address %llu to physical\n", __func__,
- logical);
-
- return -1ULL;
-}
-
-void btrfs_chunk_map_exit(void)
-{
- struct rb_node *now, *next;
- struct chunk_map_item *item;
-
- for (now = rb_first_postorder(&btrfs_info.chunks_root); now; now = next)
- {
- item = rb_entry(now, struct chunk_map_item, node);
- next = rb_next_postorder(now);
- free(item);
- }
-}
-
-int btrfs_chunk_map_init(void)
-{
- u8 sys_chunk_array_copy[sizeof(btrfs_info.sb.sys_chunk_array)];
- u8 * const start = sys_chunk_array_copy;
- u8 * const end = start + btrfs_info.sb.sys_chunk_array_size;
- u8 *cur;
- struct btrfs_key *key;
- struct btrfs_chunk *chunk;
-
- btrfs_info.chunks_root = RB_ROOT;
-
- memcpy(sys_chunk_array_copy, btrfs_info.sb.sys_chunk_array,
- sizeof(sys_chunk_array_copy));
-
- for (cur = start; cur < end;) {
- key = (struct btrfs_key *) cur;
- cur += sizeof(struct btrfs_key);
- chunk = (struct btrfs_chunk *) cur;
-
- btrfs_key_to_cpu(key);
- btrfs_chunk_to_cpu(chunk);
-
- if (key->type != BTRFS_CHUNK_ITEM_KEY) {
- printf("%s: invalid key type %u\n", __func__,
- key->type);
- return -1;
- }
-
- if (add_chunk_mapping(key, chunk))
- return -1;
-
- cur += sizeof(struct btrfs_chunk);
- cur += sizeof(struct btrfs_stripe) * (chunk->num_stripes - 1);
- }
-
- return 0;
-}
-
-int __btrfs_read_chunk_tree(void)
-{
- struct __btrfs_path path;
- struct btrfs_key key, *found_key;
- struct btrfs_chunk *chunk;
- int res = 0;
-
- key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
- key.type = BTRFS_CHUNK_ITEM_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.chunk_root, &key, &path))
- return -1;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- continue;
-
- chunk = btrfs_path_item_ptr(&path, struct btrfs_chunk);
- btrfs_chunk_to_cpu(chunk);
- if (add_chunk_mapping(found_key, chunk)) {
- res = -1;
- break;
- }
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-
- if (res < 0)
- return -1;
-
- return 0;
-}
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 346875d45a1b..987299639060 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -94,7 +94,7 @@ static u32 decompress_zlib(const u8 *_cbuf, u32 clen, u8 *dbuf, u32 dlen)
while (stream.total_in < clen) {
stream.next_in = cbuf + stream.total_in;
stream.avail_in = min((u32) (clen - stream.total_in),
- (u32) btrfs_info.sb.sectorsize);
+ current_fs_info->sectorsize);
ret = inflate(&stream, Z_NO_FLUSH);
if (ret != Z_OK)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 20c68a154d14..c5ac84599e75 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -69,296 +69,6 @@ void btrfs_release_path(struct btrfs_path *p)
memset(p, 0, sizeof(*p));
}
-int __btrfs_comp_keys(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- if (a->offset > b->offset)
- return 1;
- if (a->offset < b->offset)
- return -1;
- return 0;
-}
-
-int btrfs_comp_keys_type(struct btrfs_key *a, struct btrfs_key *b)
-{
- if (a->objectid > b->objectid)
- return 1;
- if (a->objectid < b->objectid)
- return -1;
- if (a->type > b->type)
- return 1;
- if (a->type < b->type)
- return -1;
- return 0;
-}
-
-/*
- * search for key in the extent_buffer. The items start at offset p,
- * and they are item_size apart. There are 'max' items in p.
- *
- * the slot in the array is returned via slot, and it points to
- * the place where you would insert key if it is not found in
- * the array.
- *
- * slot may point to max if the key is bigger than all of the keys
- */
-static int __generic_bin_search(void *addr, int item_size, struct btrfs_key *key,
- int max, int *slot)
-{
- int low = 0, high = max, mid, ret;
- struct btrfs_key *tmp;
-
- while (low < high) {
- mid = (low + high) / 2;
-
- tmp = (struct btrfs_key *) ((u8 *) addr + mid*item_size);
- ret = __btrfs_comp_keys(tmp, key);
-
- if (ret < 0) {
- low = mid + 1;
- } else if (ret > 0) {
- high = mid;
- } else {
- *slot = mid;
- return 0;
- }
- }
-
- *slot = low;
- return 1;
-}
-
-int __btrfs_bin_search(union btrfs_tree_node *p, struct btrfs_key *key,
- int *slot)
-{
- void *addr;
- unsigned long size;
-
- if (p->header.level) {
- addr = p->node.ptrs;
- size = sizeof(struct btrfs_key_ptr);
- } else {
- addr = p->leaf.items;
- size = sizeof(struct btrfs_item);
- }
-
- return __generic_bin_search(addr, size, key, p->header.nritems, slot);
-}
-
-static void clear_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- p->nodes[i] = NULL;
- p->slots[i] = 0;
- }
-}
-
-void __btrfs_free_path(struct __btrfs_path *p)
-{
- int i;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- if (p->nodes[i])
- free(p->nodes[i]);
- }
-
- clear_path(p);
-}
-
-static int read_tree_node(u64 physical, union btrfs_tree_node **buf)
-{
- ALLOC_CACHE_ALIGN_BUFFER(struct btrfs_header, hdr,
- sizeof(struct btrfs_header));
- unsigned long size, offset = sizeof(*hdr);
- union btrfs_tree_node *res;
- u32 i;
-
- if (!btrfs_devread(physical, sizeof(*hdr), hdr))
- return -1;
-
- btrfs_header_to_cpu(hdr);
-
- if (hdr->level)
- size = sizeof(struct btrfs_node)
- + hdr->nritems * sizeof(struct btrfs_key_ptr);
- else
- size = btrfs_info.sb.nodesize;
-
- res = malloc_cache_aligned(size);
- if (!res) {
- debug("%s: malloc failed\n", __func__);
- return -1;
- }
-
- if (!btrfs_devread(physical + offset, size - offset,
- ((u8 *) res) + offset)) {
- free(res);
- return -1;
- }
-
- memcpy(&res->header, hdr, sizeof(*hdr));
- if (hdr->level)
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_key_ptr_to_cpu(&res->node.ptrs[i]);
- else
- for (i = 0; i < hdr->nritems; ++i)
- btrfs_item_to_cpu(&res->leaf.items[i]);
-
- *buf = res;
-
- return 0;
-}
-
-int btrfs_search_tree(const struct __btrfs_root *root, struct btrfs_key *key,
- struct __btrfs_path *p)
-{
- u8 lvl, prev_lvl;
- int i, slot, ret;
- u64 logical, physical;
- union btrfs_tree_node *buf;
-
- clear_path(p);
-
- logical = root->bytenr;
-
- for (i = 0; i < BTRFS_MAX_LEVEL; ++i) {
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &buf))
- goto err;
-
- lvl = buf->header.level;
- if (i && prev_lvl != lvl + 1) {
- printf("%s: invalid level in header at %llu\n",
- __func__, logical);
- goto err;
- }
- prev_lvl = lvl;
-
- ret = __btrfs_bin_search(buf, key, &slot);
- if (ret < 0)
- goto err;
- if (ret && slot > 0 && lvl)
- slot -= 1;
-
- p->slots[lvl] = slot;
- p->nodes[lvl] = buf;
-
- if (lvl) {
- logical = buf->node.ptrs[slot].blockptr;
- } else {
- /*
- * The path might be invalid if:
- * cur leaf max < searched value < next leaf min
- *
- * Jump to the next valid element if it exists.
- */
- if (slot >= buf->header.nritems)
- if (btrfs_next_slot(p) < 0)
- goto err;
- break;
- }
- }
-
- return 0;
-err:
- __btrfs_free_path(p);
- return -1;
-}
-
-static int jump_leaf(struct __btrfs_path *path, int dir)
-{
- struct __btrfs_path p;
- u32 slot;
- int level = 1, from_level, i;
-
- dir = dir >= 0 ? 1 : -1;
-
- p = *path;
-
- while (level < BTRFS_MAX_LEVEL) {
- if (!p.nodes[level])
- return 1;
-
- slot = p.slots[level];
- if ((dir > 0 && slot + dir >= p.nodes[level]->header.nritems)
- || (dir < 0 && !slot))
- level++;
- else
- break;
- }
-
- if (level == BTRFS_MAX_LEVEL)
- return 1;
-
- p.slots[level] = slot + dir;
- level--;
- from_level = level;
-
- while (level >= 0) {
- u64 logical, physical;
-
- slot = p.slots[level + 1];
- logical = p.nodes[level + 1]->node.ptrs[slot].blockptr;
- physical = btrfs_map_logical_to_physical(logical);
- if (physical == -1ULL)
- goto err;
-
- if (read_tree_node(physical, &p.nodes[level]))
- goto err;
-
- if (dir > 0)
- p.slots[level] = 0;
- else
- p.slots[level] = p.nodes[level]->header.nritems - 1;
- level--;
- }
-
- /* Free rewritten nodes in path */
- for (i = 0; i <= from_level; ++i)
- free(path->nodes[i]);
-
- *path = p;
- return 0;
-
-err:
- /* Free rewritten nodes in p */
- for (i = level + 1; i <= from_level; ++i)
- free(p.nodes[i]);
- return -1;
-}
-
-int btrfs_prev_slot(struct __btrfs_path *p)
-{
- if (!p->slots[0])
- return jump_leaf(p, -1);
-
- p->slots[0]--;
- return 0;
-}
-
-int btrfs_next_slot(struct __btrfs_path *p)
-{
- struct btrfs_leaf *leaf = &p->nodes[0]->leaf;
-
- if (p->slots[0] + 1 >= leaf->header.nritems)
- return jump_leaf(p, 1);
-
- p->slots[0]++;
- return 0;
-}
-
int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2)
{
if (k1->objectid > k2->objectid)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 602f99b5e593..3f794a7430e1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1203,69 +1203,6 @@ union btrfs_tree_node {
struct btrfs_node node;
};
-struct __btrfs_path {
- union btrfs_tree_node *nodes[BTRFS_MAX_LEVEL];
- u32 slots[BTRFS_MAX_LEVEL];
-};
-
-struct __btrfs_root {
- u64 objectid;
- u64 bytenr;
- u64 root_dirid;
-};
-
-int __btrfs_comp_keys(struct btrfs_key *, struct btrfs_key *);
-int btrfs_comp_keys_type(struct btrfs_key *, struct btrfs_key *);
-int __btrfs_bin_search(union btrfs_tree_node *, struct btrfs_key *, int *);
-void __btrfs_free_path(struct __btrfs_path *);
-int btrfs_search_tree(const struct __btrfs_root *, struct btrfs_key *,
- struct __btrfs_path *);
-int btrfs_prev_slot(struct __btrfs_path *);
-int btrfs_next_slot(struct __btrfs_path *);
-
-static inline struct btrfs_key *btrfs_path_leaf_key(struct __btrfs_path *p) {
- /* At tree read time we have converted the endian for btrfs_disk_key */
- return (struct btrfs_key *)&p->nodes[0]->leaf.items[p->slots[0]].key;
-}
-
-static inline struct btrfs_key *
-btrfs_search_tree_key_type(const struct __btrfs_root *root, u64 objectid,
- u8 type, struct __btrfs_path *path)
-{
- struct btrfs_key key, *res;
-
- key.objectid = objectid;
- key.type = type;
- key.offset = 0;
-
- if (btrfs_search_tree(root, &key, path))
- return NULL;
-
- res = btrfs_path_leaf_key(path);
- if (btrfs_comp_keys_type(&key, res)) {
- __btrfs_free_path(path);
- return NULL;
- }
-
- return res;
-}
-
-static inline u32 btrfs_path_item_size(struct __btrfs_path *p)
-{
- return p->nodes[0]->leaf.items[p->slots[0]].size;
-}
-
-static inline void *__btrfs_leaf_data(struct btrfs_leaf *leaf, u32 slot)
-{
- return ((u8 *) leaf) + sizeof(struct btrfs_header)
- + leaf->items[slot].offset;
-}
-
-static inline void *btrfs_path_leaf_data(struct __btrfs_path *p)
-{
- return __btrfs_leaf_data(&p->nodes[0]->leaf, p->slots[0]);
-}
-
#define btrfs_path_item_ptr(p,t) \
((t *) btrfs_path_leaf_data((p)))
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index a6c66a021896..3224290b682a 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -114,85 +114,6 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
return btrfs_match_dir_item_name(root, path, name, name_len);
}
-static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
-{
- u16 max_len = BTRFS_NAME_LEN;
- u32 end;
-
- if (item->type >= BTRFS_FT_MAX) {
- printf("%s: invalid dir item type: %i\n", __func__, item->type);
- return 1;
- }
-
- if (item->type == BTRFS_FT_XATTR)
- max_len = 255; /* XATTR_NAME_MAX */
-
- end = start + sizeof(*item) + item->name_len;
- if (item->name_len > max_len || end > total) {
- printf("%s: invalid dir item name len: %u\n", __func__,
- item->name_len);
- return 1;
- }
-
- return 0;
-}
-
-static struct btrfs_dir_item *
-__btrfs_match_dir_item_name(struct __btrfs_path *path, const char *name,
- int name_len)
-{
- struct btrfs_dir_item *item;
- u32 total_len, cur = 0, this_len;
- const char *name_ptr;
-
- item = btrfs_path_item_ptr(path, struct btrfs_dir_item);
-
- total_len = btrfs_path_item_size(path);
-
- while (cur < total_len) {
- btrfs_dir_item_to_cpu(item);
- this_len = sizeof(*item) + item->name_len + item->data_len;
- name_ptr = (const char *) (item + 1);
-
- if (__verify_dir_item(item, cur, total_len))
- return NULL;
- if (item->name_len == name_len && !memcmp(name_ptr, name,
- name_len))
- return item;
-
- cur += this_len;
- item = (struct btrfs_dir_item *) ((u8 *) item + this_len);
- }
-
- return NULL;
-}
-
-int __btrfs_lookup_dir_item(const struct __btrfs_root *root, u64 dir,
- const char *name, int name_len,
- struct btrfs_dir_item *item)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_dir_item *res = NULL;
-
- key.objectid = dir;
- key.type = BTRFS_DIR_ITEM_KEY;
- key.offset = btrfs_name_hash(name, name_len);
-
- if (btrfs_search_tree(root, &key, &path))
- return -1;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
-
- res = __btrfs_match_dir_item_name(&path, name, name_len);
- if (res)
- *item = *res;
-out:
- __btrfs_free_path(&path);
- return res ? 0 : -1;
-}
-
int btrfs_iter_dir(struct btrfs_root *root, u64 ino,
btrfs_iter_dir_callback_t callback)
{
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index be2c26d323f6..48d4fb56d954 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -310,36 +310,6 @@ int btrfs_read_dev_super(struct blk_desc *desc, disk_partition_t *part,
return 0;
}
-int btrfs_read_superblock(void)
-{
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- int ret;
-
-
- btrfs_info.sb.generation = 0;
-
- ret = btrfs_read_dev_super(btrfs_blk_desc, btrfs_part_info, sb);
- if (ret < 0) {
- debug("%s: No valid BTRFS superblock found!\n", __func__);
- return ret;
- }
- btrfs_super_block_to_cpu(sb);
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
-
static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
int verify, int silent, u16 csum_type)
{
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 7c321d842561..c3eae240b47c 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -10,9 +10,6 @@
#define BTRFS_SUPER_INFO_OFFSET SZ_64K
#define BTRFS_SUPER_INFO_SIZE SZ_4K
-/* U-boot specific */
-int btrfs_read_superblock(void);
-
/* From btrfs-progs */
int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror);
struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c
index 2af710f0dd32..d4321cba3a1e 100644
--- a/fs/btrfs/extent-io.c
+++ b/fs/btrfs/extent-io.c
@@ -13,116 +13,6 @@
#include "extent-io.h"
#include "disk-io.h"
-u64 __btrfs_read_extent_inline(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u32 clen, dlen, orig_size = size, res;
- const char *cbuf;
- char *dbuf;
- const int data_off = offsetof(struct btrfs_file_extent_item,
- disk_bytenr);
-
- clen = btrfs_path_item_size(path) - data_off;
- cbuf = (const char *) extent + data_off;
- dlen = extent->ram_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- memcpy(out, cbuf + offset, size);
- return size;
- }
-
- if (dlen > orig_size) {
- dbuf = malloc(dlen);
- if (!dbuf)
- return -1ULL;
- } else {
- dbuf = out;
- }
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1 || res != dlen)
- goto err;
-
- if (dlen > orig_size) {
- memcpy(out, dbuf + offset, size);
- free(dbuf);
- } else if (offset) {
- memmove(out, dbuf + offset, size);
- }
-
- return size;
-
-err:
- if (dlen > orig_size)
- free(dbuf);
- return -1ULL;
-}
-
-u64 __btrfs_read_extent_reg(struct __btrfs_path *path,
- struct btrfs_file_extent_item *extent, u64 offset,
- u64 size, char *out)
-{
- u64 physical, clen, dlen, orig_size = size;
- u32 res;
- char *cbuf, *dbuf;
-
- clen = extent->disk_num_bytes;
- dlen = extent->num_bytes;
-
- if (offset > dlen)
- return -1ULL;
-
- if (size > dlen - offset)
- size = dlen - offset;
-
- physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
- if (physical == -1ULL)
- return -1ULL;
-
- if (extent->compression == BTRFS_COMPRESS_NONE) {
- physical += extent->offset + offset;
- if (!btrfs_devread(physical, size, out))
- return -1ULL;
-
- return size;
- }
-
- cbuf = malloc_cache_aligned(dlen > size ? clen + dlen : clen);
- if (!cbuf)
- return -1ULL;
-
- if (dlen > orig_size)
- dbuf = cbuf + clen;
- else
- dbuf = out;
-
- if (!btrfs_devread(physical, clen, cbuf))
- goto err;
-
- res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
- if (res == -1)
- goto err;
-
- if (dlen > orig_size)
- memcpy(out, dbuf + offset, size);
- else
- memmove(out, dbuf + offset, size);
-
- free(cbuf);
- return res;
-
-err:
- free(cbuf);
- return -1ULL;
-}
-
void extent_io_tree_init(struct extent_io_tree *tree)
{
cache_tree_init(&tree->state);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index faa8e3dbb76a..53e2cbef7176 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -12,81 +12,6 @@
#include "disk-io.h"
#include "volumes.h"
-u64 __btrfs_lookup_inode_ref(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_inode_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(root, inr, BTRFS_INODE_REF_KEY,
- &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_inode_ref);
- btrfs_inode_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: inode name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
-int __btrfs_lookup_inode(const struct __btrfs_root *root,
- struct btrfs_key *location,
- struct btrfs_inode_item *item,
- struct __btrfs_root *new_root)
-{
- struct __btrfs_root tmp_root = *root;
- struct __btrfs_path path;
- int res = -1;
-
- if (location->type == BTRFS_ROOT_ITEM_KEY) {
- if (btrfs_find_root(location->objectid, &tmp_root, NULL))
- return -1;
-
- location->objectid = tmp_root.root_dirid;
- location->type = BTRFS_INODE_ITEM_KEY;
- location->offset = 0;
- }
-
- if (btrfs_search_tree(&tmp_root, location, &path))
- return res;
-
- if (__btrfs_comp_keys(location, btrfs_path_leaf_key(&path)))
- goto out;
-
- if (item) {
- *item = *btrfs_path_item_ptr(&path, struct btrfs_inode_item);
- btrfs_inode_item_to_cpu(item);
- }
-
- if (new_root)
- *new_root = tmp_root;
-
- res = 0;
-
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
/*
* Read the content of symlink inode @ino of @root, into @target.
*
@@ -142,28 +67,6 @@ out:
return ret;
}
-int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
-{
- struct btrfs_root *subvolume;
- struct btrfs_fs_info *fs_info = current_fs_info;
- struct btrfs_key key;
- int ret;
-
- ASSERT(fs_info);
- key.objectid = root->objectid;
- key.type = BTRFS_ROOT_ITEM_KEY;
- key.offset = (u64)-1;
- subvolume = btrfs_read_fs_root(fs_info, &key);
- if (IS_ERR(subvolume))
- return -1;
-
- ret = btrfs_readlink(subvolume, inr, target);
- if (ret < 0)
- return -1;
- target[ret] = '\0';
- return 0;
-}
-
static int lookup_root_ref(struct btrfs_fs_info *fs_info,
u64 rootid, u64 *root_ret, u64 *dir_ret)
{
@@ -273,58 +176,6 @@ out:
return ret;
}
-/* inr must be a directory (for regular files with multiple hard links this
- function returns only one of the parents of the file) */
-static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
- struct btrfs_inode_item *inode_item)
-{
- struct btrfs_key key;
- u64 res;
-
- if (inr == BTRFS_FIRST_FREE_OBJECTID) {
- if (root->objectid != btrfs_info.fs_root.objectid) {
- u64 parent;
- struct btrfs_root_ref ref;
-
- parent = btrfs_lookup_root_ref(root->objectid, &ref,
- NULL);
- if (parent == -1ULL)
- return -1ULL;
-
- if (btrfs_find_root(parent, root, NULL))
- return -1ULL;
-
- inr = ref.dirid;
- }
-
- if (inode_item) {
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return inr;
- }
-
- res = __btrfs_lookup_inode_ref(root, inr, NULL, NULL);
- if (res == -1ULL)
- return -1ULL;
-
- if (inode_item) {
- key.objectid = res;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, inode_item, NULL))
- return -1ULL;
- }
-
- return res;
-}
-
static inline int next_length(const char *path)
{
int res = 0;
@@ -482,180 +333,6 @@ next:
return ret;
}
-u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
- u8 *type_p, struct btrfs_inode_item *inode_item_p,
- int symlink_limit)
-{
- struct btrfs_dir_item item;
- struct btrfs_inode_item inode_item;
- u8 type = BTRFS_FT_DIR;
- int len, have_inode = 0;
- const char *cur = path;
-
- if (*cur == '/') {
- ++cur;
- inr = root->root_dirid;
- }
-
- do {
- cur = skip_current_directories(cur);
-
- len = next_length(cur);
- if (len > BTRFS_NAME_LEN) {
- printf("%s: Name too long at \"%.*s\"\n", __func__,
- BTRFS_NAME_LEN, cur);
- return -1ULL;
- }
-
- if (len == 1 && cur[0] == '.')
- break;
-
- if (len == 2 && cur[0] == '.' && cur[1] == '.') {
- cur += 2;
- inr = __get_parent_inode(root, inr, &inode_item);
- if (inr == -1ULL)
- return -1ULL;
-
- type = BTRFS_FT_DIR;
- continue;
- }
-
- if (!*cur)
- break;
-
- if (__btrfs_lookup_dir_item(root, inr, cur, len, &item))
- return -1ULL;
-
- type = item.type;
- have_inode = 1;
- if (__btrfs_lookup_inode(root, (struct btrfs_key *)&item.location,
- &inode_item, root))
- return -1ULL;
-
- if (item.type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
- char *target;
-
- if (!symlink_limit) {
- printf("%s: Too much symlinks!\n", __func__);
- return -1ULL;
- }
-
- target = malloc(min(inode_item.size + 1,
- (u64) btrfs_info.sb.sectorsize));
- if (!target)
- return -1ULL;
-
- if (__btrfs_readlink(root, item.location.objectid,
- target)) {
- free(target);
- return -1ULL;
- }
-
- inr = __btrfs_lookup_path(root, inr, target, &type,
- &inode_item, symlink_limit - 1);
-
- free(target);
-
- if (inr == -1ULL)
- return -1ULL;
- } else if (item.type != BTRFS_FT_DIR && cur[len]) {
- printf("%s: \"%.*s\" not a directory\n", __func__,
- (int) (cur - path + len), path);
- return -1ULL;
- } else {
- inr = item.location.objectid;
- }
-
- cur += len;
- } while (*cur);
-
- if (type_p)
- *type_p = type;
-
- if (inode_item_p) {
- if (!have_inode) {
- struct btrfs_key key;
-
- key.objectid = inr;
- key.type = BTRFS_INODE_ITEM_KEY;
- key.offset = 0;
-
- if (__btrfs_lookup_inode(root, &key, &inode_item, NULL))
- return -1ULL;
- }
-
- *inode_item_p = inode_item;
- }
-
- return inr;
-}
-
-u64 __btrfs_file_read(const struct __btrfs_root *root, u64 inr, u64 offset,
- u64 size, char *buf)
-{
- struct __btrfs_path path;
- struct btrfs_key key;
- struct btrfs_file_extent_item *extent;
- int res = 0;
- u64 rd, rd_all = -1ULL;
-
- key.objectid = inr;
- key.type = BTRFS_EXTENT_DATA_KEY;
- key.offset = offset;
-
- if (btrfs_search_tree(root, &key, &path))
- return -1ULL;
-
- if (__btrfs_comp_keys(&key, btrfs_path_leaf_key(&path)) < 0) {
- if (btrfs_prev_slot(&path))
- goto out;
-
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- goto out;
- }
-
- rd_all = 0;
-
- do {
- if (btrfs_comp_keys_type(&key, btrfs_path_leaf_key(&path)))
- break;
-
- extent = btrfs_path_item_ptr(&path,
- struct btrfs_file_extent_item);
-
- if (extent->type == BTRFS_FILE_EXTENT_INLINE) {
- btrfs_file_extent_item_to_cpu_inl(extent);
- rd = __btrfs_read_extent_inline(&path, extent, offset,
- size, buf);
- } else {
- btrfs_file_extent_item_to_cpu(extent);
- rd = __btrfs_read_extent_reg(&path, extent, offset, size,
- buf);
- }
-
- if (rd == -1ULL) {
- printf("%s: Error reading extent\n", __func__);
- rd_all = -1;
- goto out;
- }
-
- offset = 0;
- buf += rd;
- rd_all += rd;
- size -= rd;
-
- if (!size)
- break;
- } while (!(res = btrfs_next_slot(&path)));
-
- if (res)
- return -1ULL;
-
-out:
- __btrfs_free_path(&path);
- return rd_all;
-}
-
/*
* Read out inline extent.
*
diff --git a/fs/btrfs/root.c b/fs/btrfs/root.c
deleted file mode 100644
index a424966df61e..000000000000
--- a/fs/btrfs/root.c
+++ /dev/null
@@ -1,92 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
- */
-
-#include "btrfs.h"
-
-static void read_root_item(struct __btrfs_path *p, struct btrfs_root_item *item)
-{
- u32 len;
- int reset = 0;
-
- len = btrfs_path_item_size(p);
- memcpy(item, btrfs_path_item_ptr(p, struct btrfs_root_item), len);
- btrfs_root_item_to_cpu(item);
-
- if (len < sizeof(*item))
- reset = 1;
- if (!reset && item->generation != item->generation_v2) {
- if (item->generation_v2 != 0)
- printf("%s: generation != generation_v2 in root item",
- __func__);
- reset = 1;
- }
- if (reset) {
- memset(&item->generation_v2, 0,
- sizeof(*item) - offsetof(struct btrfs_root_item,
- generation_v2));
- }
-}
-
-int btrfs_find_root(u64 objectid, struct __btrfs_root *root,
- struct btrfs_root_item *root_item)
-{
- struct __btrfs_path path;
- struct btrfs_root_item my_root_item;
-
- if (!btrfs_search_tree_key_type(&btrfs_info.tree_root, objectid,
- BTRFS_ROOT_ITEM_KEY, &path))
- return -1;
-
- if (!root_item)
- root_item = &my_root_item;
- read_root_item(&path, root_item);
-
- if (root) {
- root->objectid = objectid;
- root->bytenr = root_item->bytenr;
- root->root_dirid = root_item->root_dirid;
- }
-
- __btrfs_free_path(&path);
- return 0;
-}
-
-u64 btrfs_lookup_root_ref(u64 subvolid, struct btrfs_root_ref *refp, char *name)
-{
- struct __btrfs_path path;
- struct btrfs_key *key;
- struct btrfs_root_ref *ref;
- u64 res = -1ULL;
-
- key = btrfs_search_tree_key_type(&btrfs_info.tree_root, subvolid,
- BTRFS_ROOT_BACKREF_KEY, &path);
-
- if (!key)
- return -1ULL;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- if (refp)
- *refp = *ref;
-
- if (name) {
- if (ref->name_len > BTRFS_NAME_LEN) {
- printf("%s: volume name too long: %u\n", __func__,
- ref->name_len);
- goto out;
- }
-
- memcpy(name, ref + 1, ref->name_len);
- }
-
- res = key->offset;
-out:
- __btrfs_free_path(&path);
- return res;
-}
-
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c
deleted file mode 100644
index 0e72577d0df5..000000000000
--- a/fs/btrfs/subvolume.c
+++ /dev/null
@@ -1,130 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun at nic.cz
- */
-
-#include "btrfs.h"
-#include <malloc.h>
-
-static int get_subvol_name(u64 subvolid, char *name, int max_len)
-{
- struct btrfs_root_ref rref;
- struct btrfs_inode_ref iref;
- struct __btrfs_root root;
- u64 dir;
- char tmp[BTRFS_NAME_LEN];
- char *ptr;
-
- ptr = name + max_len - 1;
- *ptr = '\0';
-
- while (subvolid != BTRFS_FS_TREE_OBJECTID) {
- subvolid = btrfs_lookup_root_ref(subvolid, &rref, tmp);
-
- if (subvolid == -1ULL)
- return -1;
-
- ptr -= rref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, rref.name_len);
- *ptr = '/';
-
- if (btrfs_find_root(subvolid, &root, NULL))
- return -1;
-
- dir = rref.dirid;
-
- while (dir != BTRFS_FIRST_FREE_OBJECTID) {
- dir = __btrfs_lookup_inode_ref(&root, dir, &iref, tmp);
-
- if (dir == -1ULL)
- return -1;
-
- ptr -= iref.name_len + 1;
- if (ptr < name)
- goto too_long;
-
- memcpy(ptr + 1, tmp, iref.name_len);
- *ptr = '/';
- }
- }
-
- if (ptr == name + max_len - 1) {
- name[0] = '/';
- name[1] = '\0';
- } else {
- memmove(name, ptr, name + max_len - ptr);
- }
-
- return 0;
-
-too_long:
- printf("%s: subvolume name too long\n", __func__);
- return -1;
-}
-
-u64 btrfs_get_default_subvol_objectid(void)
-{
- struct btrfs_dir_item item;
-
- if (__btrfs_lookup_dir_item(&btrfs_info.tree_root,
- btrfs_info.sb.root_dir_objectid, "default", 7,
- &item))
- return BTRFS_FS_TREE_OBJECTID;
- return item.location.objectid;
-}
-
-static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
-{
- struct btrfs_key key, *found_key;
- struct __btrfs_path path;
- struct btrfs_root_ref *ref;
- int res;
-
- key.objectid = tree;
- key.type = BTRFS_ROOT_REF_KEY;
- key.offset = 0;
-
- if (btrfs_search_tree(&btrfs_info.tree_root, &key, &path))
- return;
-
- do {
- found_key = btrfs_path_leaf_key(&path);
- if (btrfs_comp_keys_type(&key, found_key))
- break;
-
- ref = btrfs_path_item_ptr(&path, struct btrfs_root_ref);
- btrfs_root_ref_to_cpu(ref);
-
- printf("ID %llu parent %llu name ", found_key->offset, tree);
- if (nameptr && !get_subvol_name(found_key->offset, nameptr,
- max_name_len))
- printf("%s\n", nameptr);
- else
- printf("%.*s\n", (int) ref->name_len,
- (const char *) (ref + 1));
-
- if (level > 0)
- list_subvols(found_key->offset, nameptr, max_name_len,
- level - 1);
- else
- printf("%s: Too much recursion, maybe skipping some "
- "subvolumes\n", __func__);
- } while (!(res = btrfs_next_slot(&path)));
-
- __btrfs_free_path(&path);
-}
-
-void btrfs_list_subvols(void)
-{
- char *nameptr = malloc(4096);
-
- list_subvols(BTRFS_FS_TREE_OBJECTID, nameptr, nameptr ? 4096 : 0, 40);
-
- if (nameptr)
- free(nameptr);
-}
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 26/26] MAINTAINERS: Add btrfs mail list
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 6:50 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: linux-btrfs, fstests, u-boot; +Cc: marek.behun
Since the current code base is mostly from btrfs-progs, anyone
contributing to U-boot btrfs code could also help us to improve
btrfs-progs and btrfs kernel module.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
MAINTAINERS | 1 +
1 file changed, 1 insertion(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index b50652bd85d0..2bb69aeb72eb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -529,6 +529,7 @@ F: tools/binman/
BTRFS
M: Marek Behun <marek.behun@nic.cz>
+L: linux-btrfs@vger.kernel.org
S: Maintained
F: cmd/btrfs.c
F: fs/btrfs/
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 26/26] MAINTAINERS: Add btrfs mail list
@ 2020-04-22 6:50 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 6:50 UTC (permalink / raw)
To: u-boot
Since the current code base is mostly from btrfs-progs, anyone
contributing to U-boot btrfs code could also help us to improve
btrfs-progs and btrfs kernel module.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
MAINTAINERS | 1 +
1 file changed, 1 insertion(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index b50652bd85d0..2bb69aeb72eb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -529,6 +529,7 @@ F: tools/binman/
BTRFS
M: Marek Behun <marek.behun@nic.cz>
+L: linux-btrfs at vger.kernel.org
S: Maintained
F: cmd/btrfs.c
F: fs/btrfs/
--
2.26.0
^ permalink raw reply related [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 7:46 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:46 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
On Wed, 22 Apr 2020 14:49:43 +0800
Qu Wenruo <wqu@suse.com> wrote:
Hi Qu,
> The current btrfs code in U-boot is using a creative way to read on-disk
> data.
> It's pretty simple, involving the least amount of code, but pretty
> different from btrfs-progs nor kernel, making it pretty hard to sync
> code between different projects.
do you think maybe btrfs-progs / kernel would be interested if I
tried to convert their code to this "simpler to use" implementation of
conversion functions?
> Thus only the following 5 patches need extra review attention:
> - Patch 0017
> - Patch 0018
> - Patch 0022
> - Patch 0023
> - Patch 0024
Anyway, this patch series does not apply cleanly on u-boot/master. I
tried with the first 3 patches and then gave up :(
Sorry about this but I will review and test if you send a series that
applies cleanly.
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 7:46 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:46 UTC (permalink / raw)
To: u-boot
On Wed, 22 Apr 2020 14:49:43 +0800
Qu Wenruo <wqu@suse.com> wrote:
Hi Qu,
> The current btrfs code in U-boot is using a creative way to read on-disk
> data.
> It's pretty simple, involving the least amount of code, but pretty
> different from btrfs-progs nor kernel, making it pretty hard to sync
> code between different projects.
do you think maybe btrfs-progs / kernel would be interested if I
tried to convert their code to this "simpler to use" implementation of
conversion functions?
> Thus only the following 5 patches need extra review attention:
> - Patch 0017
> - Patch 0018
> - Patch 0022
> - Patch 0023
> - Patch 0024
Anyway, this patch series does not apply cleanly on u-boot/master. I
tried with the first 3 patches and then gave up :(
Sorry about this but I will review and test if you send a series that
applies cleanly.
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 7:52 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:52 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
I am testing compilation from the github repository.
Another problem is that in the cleanup patch you have removed
btrfs_list_subvols functoin, which is used by cmd/btrfs.c to list
subvolumes. So Turris Mox and Turris Omnia with their default defconfig
do not compile now.
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 7:52 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:52 UTC (permalink / raw)
To: u-boot
I am testing compilation from the github repository.
Another problem is that in the cleanup patch you have removed
btrfs_list_subvols functoin, which is used by cmd/btrfs.c to list
subvolumes. So Turris Mox and Turris Omnia with their default defconfig
do not compile now.
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 7:46 ` Marek Behun
@ 2020-04-22 7:52 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 7:52 UTC (permalink / raw)
To: Marek Behun, Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
[-- Attachment #1.1: Type: text/plain, Size: 1398 bytes --]
On 2020/4/22 下午3:46, Marek Behun wrote:
> On Wed, 22 Apr 2020 14:49:43 +0800
> Qu Wenruo <wqu@suse.com> wrote:
>
> Hi Qu,
>
>> The current btrfs code in U-boot is using a creative way to read on-disk
>> data.
>> It's pretty simple, involving the least amount of code, but pretty
>> different from btrfs-progs nor kernel, making it pretty hard to sync
>> code between different projects.
>
> do you think maybe btrfs-progs / kernel would be interested if I
> tried to convert their code to this "simpler to use" implementation of
> conversion functions?
I don't think so, the problem is kernel and btrfs-progs all need to
modify extent buffer, which make the read time conversion become a
burden in write path.
>
>> Thus only the following 5 patches need extra review attention:
>> - Patch 0017
>> - Patch 0018
>> - Patch 0022
>> - Patch 0023
>> - Patch 0024
>
> Anyway, this patch series does not apply cleanly on u-boot/master. I
> tried with the first 3 patches and then gave up :(
> Sorry about this but I will review and test if you send a series that
> applies cleanly.
That's strange, the branch is originally based on an older master, as
you can find in the github.
I guess there are some more btrfs related code change since then, I'll
rebase them to latest master, and update the github repo then.
Thanks,
Qu
>
> Marek
>
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^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 7:52 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 7:52 UTC (permalink / raw)
To: u-boot
On 2020/4/22 ??3:46, Marek Behun wrote:
> On Wed, 22 Apr 2020 14:49:43 +0800
> Qu Wenruo <wqu@suse.com> wrote:
>
> Hi Qu,
>
>> The current btrfs code in U-boot is using a creative way to read on-disk
>> data.
>> It's pretty simple, involving the least amount of code, but pretty
>> different from btrfs-progs nor kernel, making it pretty hard to sync
>> code between different projects.
>
> do you think maybe btrfs-progs / kernel would be interested if I
> tried to convert their code to this "simpler to use" implementation of
> conversion functions?
I don't think so, the problem is kernel and btrfs-progs all need to
modify extent buffer, which make the read time conversion become a
burden in write path.
>
>> Thus only the following 5 patches need extra review attention:
>> - Patch 0017
>> - Patch 0018
>> - Patch 0022
>> - Patch 0023
>> - Patch 0024
>
> Anyway, this patch series does not apply cleanly on u-boot/master. I
> tried with the first 3 patches and then gave up :(
> Sorry about this but I will review and test if you send a series that
> applies cleanly.
That's strange, the branch is originally based on an older master, as
you can find in the github.
I guess there are some more btrfs related code change since then, I'll
rebase them to latest master, and update the github repo then.
Thanks,
Qu
>
> Marek
>
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^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 7:52 ` Qu Wenruo
@ 2020-04-22 7:56 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 7:56 UTC (permalink / raw)
To: Marek Behun, Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
[-- Attachment #1.1: Type: text/plain, Size: 1696 bytes --]
On 2020/4/22 下午3:52, Qu Wenruo wrote:
>
>
> On 2020/4/22 下午3:46, Marek Behun wrote:
>> On Wed, 22 Apr 2020 14:49:43 +0800
>> Qu Wenruo <wqu@suse.com> wrote:
>>
>> Hi Qu,
>>
>>> The current btrfs code in U-boot is using a creative way to read on-disk
>>> data.
>>> It's pretty simple, involving the least amount of code, but pretty
>>> different from btrfs-progs nor kernel, making it pretty hard to sync
>>> code between different projects.
>>
>> do you think maybe btrfs-progs / kernel would be interested if I
>> tried to convert their code to this "simpler to use" implementation of
>> conversion functions?
>
> I don't think so, the problem is kernel and btrfs-progs all need to
> modify extent buffer, which make the read time conversion become a
> burden in write path.
>
>>
>>> Thus only the following 5 patches need extra review attention:
>>> - Patch 0017
>>> - Patch 0018
>>> - Patch 0022
>>> - Patch 0023
>>> - Patch 0024
>>
>> Anyway, this patch series does not apply cleanly on u-boot/master. I
>> tried with the first 3 patches and then gave up :(
>> Sorry about this but I will review and test if you send a series that
>> applies cleanly.
>
> That's strange, the branch is originally based on an older master, as
> you can find in the github.
>
> I guess there are some more btrfs related code change since then, I'll
> rebase them to latest master, and update the github repo then.
Git repo updated.
You can fetch that branch.
Only two small conflicts during rebase, and since it compiles I haven't
re-done the full test, but it looks pretty OK.
Thanks,
Qu
>
> Thanks,
> Qu
>
>>
>> Marek
>>
>
[-- Attachment #2: OpenPGP digital signature --]
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^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 7:56 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 7:56 UTC (permalink / raw)
To: u-boot
On 2020/4/22 ??3:52, Qu Wenruo wrote:
>
>
> On 2020/4/22 ??3:46, Marek Behun wrote:
>> On Wed, 22 Apr 2020 14:49:43 +0800
>> Qu Wenruo <wqu@suse.com> wrote:
>>
>> Hi Qu,
>>
>>> The current btrfs code in U-boot is using a creative way to read on-disk
>>> data.
>>> It's pretty simple, involving the least amount of code, but pretty
>>> different from btrfs-progs nor kernel, making it pretty hard to sync
>>> code between different projects.
>>
>> do you think maybe btrfs-progs / kernel would be interested if I
>> tried to convert their code to this "simpler to use" implementation of
>> conversion functions?
>
> I don't think so, the problem is kernel and btrfs-progs all need to
> modify extent buffer, which make the read time conversion become a
> burden in write path.
>
>>
>>> Thus only the following 5 patches need extra review attention:
>>> - Patch 0017
>>> - Patch 0018
>>> - Patch 0022
>>> - Patch 0023
>>> - Patch 0024
>>
>> Anyway, this patch series does not apply cleanly on u-boot/master. I
>> tried with the first 3 patches and then gave up :(
>> Sorry about this but I will review and test if you send a series that
>> applies cleanly.
>
> That's strange, the branch is originally based on an older master, as
> you can find in the github.
>
> I guess there are some more btrfs related code change since then, I'll
> rebase them to latest master, and update the github repo then.
Git repo updated.
You can fetch that branch.
Only two small conflicts during rebase, and since it compiles I haven't
re-done the full test, but it looks pretty OK.
Thanks,
Qu
>
> Thanks,
> Qu
>
>>
>> Marek
>>
>
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^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 7:59 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:59 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
Also there are some warnings when compiling for Mox and Omnia:
fs/btrfs/inode.c: In function ‘btrfs_lookup_path’:
fs/btrfs/inode.c:141:16: warning: ‘parent_root’ may be used uninitialized in this function [-Wmaybe-uninitialized]
141 | key.objectid = parent_root;
| ~~~~~~~~~~~~~^~~~~~~~~~~~~
fs/btrfs/inode.c:127:7: note: ‘parent_root’ was declared here
127 | u64 parent_root;
| ^~~~~~~~~~~
CC cmd/nvedit.o
In file included from fs/btrfs/ctree.h:19,
from fs/btrfs/disk-io.h:7,
from fs/btrfs/disk-io.c:8:
fs/btrfs/disk-io.c: In function ‘btrfs_scan_fs_devices’:
fs/btrfs/disk-io.c:881:9: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘lbaint_t’ {aka ‘long unsigned int’} [-Wformat=]
881 | error("superblock end %u is larger than device size %llu",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
882 | BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
883 | part->size << desc->log2blksz);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| lbaint_t {aka long unsigned int}
fs/btrfs/compat.h:13:29: note: in definition of macro ‘error’
13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
| ^~~~~~~~~~~
fs/btrfs/disk-io.c:881:58: note: format string is defined here
881 | error("superblock end %u is larger than device size %llu",
| ~~~^
| |
| long long unsigned int
| %lu
In file included from fs/btrfs/ctree.h:19,
from fs/btrfs/volumes.c:5:
fs/btrfs/volumes.c: In function ‘btrfs_check_chunk_valid’:
fs/btrfs/volumes.c:404:9: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘u32’ {aka ‘unsigned int’} [-Wformat=]
404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/btrfs/compat.h:13:29: note: in definition of macro ‘error’
13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
| ^~~~~~~~~~~
fs/btrfs/volumes.c:404:58: note: format string is defined here
404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
| ~~^
| |
| long unsigned int
| %u
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 7:59 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 7:59 UTC (permalink / raw)
To: u-boot
Also there are some warnings when compiling for Mox and Omnia:
fs/btrfs/inode.c: In function ?btrfs_lookup_path?:
fs/btrfs/inode.c:141:16: warning: ?parent_root? may be used uninitialized in this function [-Wmaybe-uninitialized]
141 | key.objectid = parent_root;
| ~~~~~~~~~~~~~^~~~~~~~~~~~~
fs/btrfs/inode.c:127:7: note: ?parent_root? was declared here
127 | u64 parent_root;
| ^~~~~~~~~~~
CC cmd/nvedit.o
In file included from fs/btrfs/ctree.h:19,
from fs/btrfs/disk-io.h:7,
from fs/btrfs/disk-io.c:8:
fs/btrfs/disk-io.c: In function ?btrfs_scan_fs_devices?:
fs/btrfs/disk-io.c:881:9: warning: format ?%llu? expects argument of type ?long long unsigned int?, but argument 3 has type ?lbaint_t? {aka ?long unsigned int?} [-Wformat=]
881 | error("superblock end %u is larger than device size %llu",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
882 | BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
883 | part->size << desc->log2blksz);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| lbaint_t {aka long unsigned int}
fs/btrfs/compat.h:13:29: note: in definition of macro ?error?
13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
| ^~~~~~~~~~~
fs/btrfs/disk-io.c:881:58: note: format string is defined here
881 | error("superblock end %u is larger than device size %llu",
| ~~~^
| |
| long long unsigned int
| %lu
In file included from fs/btrfs/ctree.h:19,
from fs/btrfs/volumes.c:5:
fs/btrfs/volumes.c: In function ?btrfs_check_chunk_valid?:
fs/btrfs/volumes.c:404:9: warning: format ?%lu? expects argument of type ?long unsigned int?, but argument 4 has type ?u32? {aka ?unsigned int?} [-Wformat=]
404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/btrfs/compat.h:13:29: note: in definition of macro ?error?
13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
| ^~~~~~~~~~~
fs/btrfs/volumes.c:404:58: note: format string is defined here
404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
| ~~^
| |
| long unsigned int
| %u
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 7:59 ` Marek Behun
@ 2020-04-22 8:12 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 8:12 UTC (permalink / raw)
To: Marek Behun, Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
[-- Attachment #1.1: Type: text/plain, Size: 3240 bytes --]
On 2020/4/22 下午3:59, Marek Behun wrote:
> Also there are some warnings when compiling for Mox and Omnia:
>
>
>
>
> fs/btrfs/inode.c: In function ‘btrfs_lookup_path’:
> fs/btrfs/inode.c:141:16: warning: ‘parent_root’ may be used uninitialized in this function [-Wmaybe-uninitialized]
> 141 | key.objectid = parent_root;
> | ~~~~~~~~~~~~~^~~~~~~~~~~~~
> fs/btrfs/inode.c:127:7: note: ‘parent_root’ was declared here
> 127 | u64 parent_root;
> | ^~~~~~~~~~~
> CC cmd/nvedit.o
> In file included from fs/btrfs/ctree.h:19,
> from fs/btrfs/disk-io.h:7,
> from fs/btrfs/disk-io.c:8:
> fs/btrfs/disk-io.c: In function ‘btrfs_scan_fs_devices’:
> fs/btrfs/disk-io.c:881:9: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘lbaint_t’ {aka ‘long unsigned int’} [-Wformat=]
> 881 | error("superblock end %u is larger than device size %llu",
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 882 | BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
> 883 | part->size << desc->log2blksz);
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | |
> | lbaint_t {aka long unsigned int}
> fs/btrfs/compat.h:13:29: note: in definition of macro ‘error’
> 13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
> | ^~~~~~~~~~~
> fs/btrfs/disk-io.c:881:58: note: format string is defined here
> 881 | error("superblock end %u is larger than device size %llu",
> | ~~~^
> | |
> | long long unsigned int
> | %lu
>
>
>
>
>
>
> In file included from fs/btrfs/ctree.h:19,
> from fs/btrfs/volumes.c:5:
> fs/btrfs/volumes.c: In function ‘btrfs_check_chunk_valid’:
> fs/btrfs/volumes.c:404:9: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘u32’ {aka ‘unsigned int’} [-Wformat=]
> 404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> fs/btrfs/compat.h:13:29: note: in definition of macro ‘error’
> 13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
> | ^~~~~~~~~~~
> fs/btrfs/volumes.c:404:58: note: format string is defined here
> 404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
> | ~~^
> | |
> | long unsigned int
> | %u
>
I also hit those with GCC 9.2, but in GCC 9.3 they just disappear, so
I'm not sure whether they are bugs from GCC or something else...
Thanks,
Qu
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^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 8:12 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 8:12 UTC (permalink / raw)
To: u-boot
On 2020/4/22 ??3:59, Marek Behun wrote:
> Also there are some warnings when compiling for Mox and Omnia:
>
>
>
>
> fs/btrfs/inode.c: In function ?btrfs_lookup_path?:
> fs/btrfs/inode.c:141:16: warning: ?parent_root? may be used uninitialized in this function [-Wmaybe-uninitialized]
> 141 | key.objectid = parent_root;
> | ~~~~~~~~~~~~~^~~~~~~~~~~~~
> fs/btrfs/inode.c:127:7: note: ?parent_root? was declared here
> 127 | u64 parent_root;
> | ^~~~~~~~~~~
> CC cmd/nvedit.o
> In file included from fs/btrfs/ctree.h:19,
> from fs/btrfs/disk-io.h:7,
> from fs/btrfs/disk-io.c:8:
> fs/btrfs/disk-io.c: In function ?btrfs_scan_fs_devices?:
> fs/btrfs/disk-io.c:881:9: warning: format ?%llu? expects argument of type ?long long unsigned int?, but argument 3 has type ?lbaint_t? {aka ?long unsigned int?} [-Wformat=]
> 881 | error("superblock end %u is larger than device size %llu",
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 882 | BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET,
> 883 | part->size << desc->log2blksz);
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | |
> | lbaint_t {aka long unsigned int}
> fs/btrfs/compat.h:13:29: note: in definition of macro ?error?
> 13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
> | ^~~~~~~~~~~
> fs/btrfs/disk-io.c:881:58: note: format string is defined here
> 881 | error("superblock end %u is larger than device size %llu",
> | ~~~^
> | |
> | long long unsigned int
> | %lu
>
>
>
>
>
>
> In file included from fs/btrfs/ctree.h:19,
> from fs/btrfs/volumes.c:5:
> fs/btrfs/volumes.c: In function ?btrfs_check_chunk_valid?:
> fs/btrfs/volumes.c:404:9: warning: format ?%lu? expects argument of type ?long unsigned int?, but argument 4 has type ?u32? {aka ?unsigned int?} [-Wformat=]
> 404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> fs/btrfs/compat.h:13:29: note: in definition of macro ?error?
> 13 | #define error(...) { printf(__VA_ARGS__); printf("\n"); }
> | ^~~~~~~~~~~
> fs/btrfs/volumes.c:404:58: note: format string is defined here
> 404 | error("invalid chunk item size, have %u expect [%zu, %lu)",
> | ~~^
> | |
> | long unsigned int
> | %u
>
I also hit those with GCC 9.2, but in GCC 9.3 they just disappear, so
I'm not sure whether they are bugs from GCC or something else...
Thanks,
Qu
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^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 8:13 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 8:13 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
Just for informational purposes for others:
I tested compiling with and without this patches to see how much it
increases binary size.
Omnia (armv7a) Mox (aarch64)
with old btrfs 52900 (51.7 KB) 55456 (54.2 KB)
with new btrfs 76176 (74.4 KB) 75480 (73.7 KB)
diff 23276 (22.7 KB) 20024 (19.5 KB)
increase driver 44% 36%
increase u-boot 3.46% 2.81%
(I don't actually care much, this is not too much, this is something
that can maybe be reduced by using some optimizations which u-boot does
not support yet and also there should be enough storage for u-boot on
Mox and Omnia. But maybe someone else will care enough.)
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 8:13 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 8:13 UTC (permalink / raw)
To: u-boot
Just for informational purposes for others:
I tested compiling with and without this patches to see how much it
increases binary size.
Omnia (armv7a) Mox (aarch64)
with old btrfs 52900 (51.7 KB) 55456 (54.2 KB)
with new btrfs 76176 (74.4 KB) 75480 (73.7 KB)
diff 23276 (22.7 KB) 20024 (19.5 KB)
increase driver 44% 36%
increase u-boot 3.46% 2.81%
(I don't actually care much, this is not too much, this is something
that can maybe be reduced by using some optimizations which u-boot does
not support yet and also there should be enough storage for u-boot on
Mox and Omnia. But maybe someone else will care enough.)
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
2020-04-22 6:49 ` Qu Wenruo
@ 2020-04-22 8:26 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 8:26 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
On Wed, 22 Apr 2020 14:49:46 +0800
Qu Wenruo <wqu@suse.com> wrote:
> +/* A simple wraper to for error() from btrfs-progs */
> +#define error(...) { printf(__VA_ARGS__); printf("\n"); }
Is this from btrfs-progs?
I don't like these macros much, I prefer to use static inline functions.
static inline void error(const char *fmt, ...)
{
printf(fmt, __builtin_va_arg_pack());
printf("\n");
}
Attribute for printf can be added to check printf specifiers:
__attribute__((format (__printf__, 1, 2)))
It is possible that this won't compile when optimizations are disabled.
In that case more attributes are needed
__always_inline __attribute__((__gnu_inline__))
These could be defined as a macro in include/linux/compiler-gcc.h
#define __gnu_inline __always_inline __attribute__((__gnu_inline__))
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
@ 2020-04-22 8:26 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 8:26 UTC (permalink / raw)
To: u-boot
On Wed, 22 Apr 2020 14:49:46 +0800
Qu Wenruo <wqu@suse.com> wrote:
> +/* A simple wraper to for error() from btrfs-progs */
> +#define error(...) { printf(__VA_ARGS__); printf("\n"); }
Is this from btrfs-progs?
I don't like these macros much, I prefer to use static inline functions.
static inline void error(const char *fmt, ...)
{
printf(fmt, __builtin_va_arg_pack());
printf("\n");
}
Attribute for printf can be added to check printf specifiers:
__attribute__((format (__printf__, 1, 2)))
It is possible that this won't compile when optimizations are disabled.
In that case more attributes are needed
__always_inline __attribute__((__gnu_inline__))
These could be defined as a macro in include/linux/compiler-gcc.h
#define __gnu_inline __always_inline __attribute__((__gnu_inline__))
Marek
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
2020-04-22 8:26 ` Marek Behun
@ 2020-04-22 8:34 ` Qu Wenruo
-1 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 8:34 UTC (permalink / raw)
To: Marek Behun, Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot
[-- Attachment #1.1: Type: text/plain, Size: 1147 bytes --]
On 2020/4/22 下午4:26, Marek Behun wrote:
> On Wed, 22 Apr 2020 14:49:46 +0800
> Qu Wenruo <wqu@suse.com> wrote:
>
>> +/* A simple wraper to for error() from btrfs-progs */
>> +#define error(...) { printf(__VA_ARGS__); printf("\n"); }
>
> Is this from btrfs-progs?
Nope, anything in compat.h is mostly for different projects to share the
same code.
> I don't like these macros much, I prefer to use static inline functions.
>
> static inline void error(const char *fmt, ...)
> {
> printf(fmt, __builtin_va_arg_pack());
> printf("\n");
> }
That looks much better, especially we can tell compiler that we want
printf check on the parameters.
Thanks,
Qu
>
> Attribute for printf can be added to check printf specifiers:
> __attribute__((format (__printf__, 1, 2)))
>
> It is possible that this won't compile when optimizations are disabled.
> In that case more attributes are needed
> __always_inline __attribute__((__gnu_inline__))
> These could be defined as a macro in include/linux/compiler-gcc.h
> #define __gnu_inline __always_inline __attribute__((__gnu_inline__))
>
> Marek
>
[-- Attachment #2: OpenPGP digital signature --]
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^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs
@ 2020-04-22 8:34 ` Qu Wenruo
0 siblings, 0 replies; 85+ messages in thread
From: Qu Wenruo @ 2020-04-22 8:34 UTC (permalink / raw)
To: u-boot
On 2020/4/22 ??4:26, Marek Behun wrote:
> On Wed, 22 Apr 2020 14:49:46 +0800
> Qu Wenruo <wqu@suse.com> wrote:
>
>> +/* A simple wraper to for error() from btrfs-progs */
>> +#define error(...) { printf(__VA_ARGS__); printf("\n"); }
>
> Is this from btrfs-progs?
Nope, anything in compat.h is mostly for different projects to share the
same code.
> I don't like these macros much, I prefer to use static inline functions.
>
> static inline void error(const char *fmt, ...)
> {
> printf(fmt, __builtin_va_arg_pack());
> printf("\n");
> }
That looks much better, especially we can tell compiler that we want
printf check on the parameters.
Thanks,
Qu
>
> Attribute for printf can be added to check printf specifiers:
> __attribute__((format (__printf__, 1, 2)))
>
> It is possible that this won't compile when optimizations are disabled.
> In that case more attributes are needed
> __always_inline __attribute__((__gnu_inline__))
> These could be defined as a macro in include/linux/compiler-gcc.h
> #define __gnu_inline __always_inline __attribute__((__gnu_inline__))
>
> Marek
>
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^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
2020-04-22 7:52 ` Qu Wenruo
@ 2020-04-22 9:33 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 9:33 UTC (permalink / raw)
To: Qu Wenruo; +Cc: Qu Wenruo, linux-btrfs, fstests, u-boot
On Wed, 22 Apr 2020 15:52:25 +0800
Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
> > do you think maybe btrfs-progs / kernel would be interested if I
> > tried to convert their code to this "simpler to use" implementation of
> > conversion functions?
>
> I don't think so, the problem is kernel and btrfs-progs all need to
> modify extent buffer, which make the read time conversion become a
> burden in write path.
:(
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code
@ 2020-04-22 9:33 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 9:33 UTC (permalink / raw)
To: u-boot
On Wed, 22 Apr 2020 15:52:25 +0800
Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
> > do you think maybe btrfs-progs / kernel would be interested if I
> > tried to convert their code to this "simpler to use" implementation of
> > conversion functions?
>
> I don't think so, the problem is kernel and btrfs-progs all need to
> modify extent buffer, which make the read time conversion become a
> burden in write path.
:(
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 6:50 ` Qu Wenruo
(?)
@ 2020-04-22 9:37 ` Su Yue
-1 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 9:37 UTC (permalink / raw)
To: u-boot
On Wed 22 Apr 2020 at 14:50, Qu Wenruo <wqu@suse.com> wrote:
> This is the extent buffer based path lookup routine.
>
> To implement this, btrfs_lookup_dir_item() is cross ported from
> btrfs-progs, and implement btrfs_lookup_path() from scratch.
>
> Unlike the existing __btrfs_lookup_path(), since
> btrfs_read_fs_root()
> will check whether a root is orphan at read time, there is no
> need to
> check root backref, this make the code a little easier to read.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> ---
> fs/btrfs/ctree.h | 4 +
> fs/btrfs/dir-item.c | 106 +++++++++++++++++++
> fs/btrfs/inode.c | 245
> ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 355 insertions(+)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index f702eaff293c..78f7746d1f32 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1284,6 +1284,10 @@ struct btrfs_dir_item
> *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> struct btrfs_path *path, u64 dir,
> const char *name, int name_len,
> int mod);
> +/* inode.c */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const
> char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit);
>
> /* ctree.c */
> int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const
> struct btrfs_key *k2);
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
> index aea621c72bb3..4bf45c2fa925 100644
> --- a/fs/btrfs/dir-item.c
> +++ b/fs/btrfs/dir-item.c
> @@ -8,6 +8,112 @@
> #include "btrfs.h"
> #include "disk-io.h"
>
> +static int verify_dir_item(struct btrfs_root *root,
> + struct extent_buffer *leaf,
> + struct btrfs_dir_item *dir_item)
> +{
> + u16 namelen = BTRFS_NAME_LEN;
> + u8 type = btrfs_dir_type(leaf, dir_item);
> +
> + if (type == BTRFS_FT_XATTR)
> + namelen = XATTR_NAME_MAX;
> +
> + if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
> + fprintf(stderr, "invalid dir item name len: %u\n",
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
> + if ((btrfs_dir_data_len(leaf, dir_item) +
> + btrfs_dir_name_len(leaf, dir_item)) >
> + BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
> + fprintf(stderr, "invalid dir item name + data len: %u +
> %u\n",
> + (unsigned)btrfs_dir_name_len(leaf, dir_item),
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +struct btrfs_dir_item *btrfs_match_dir_item_name(struct
> btrfs_root *root,
> + struct btrfs_path *path,
> + const char *name, int name_len)
> +{
> + struct btrfs_dir_item *dir_item;
> + unsigned long name_ptr;
> + u32 total_len;
> + u32 cur = 0;
> + u32 this_len;
> + struct extent_buffer *leaf;
> +
> + leaf = path->nodes[0];
> + dir_item = btrfs_item_ptr(leaf, path->slots[0], struct
> btrfs_dir_item);
> + total_len = btrfs_item_size_nr(leaf, path->slots[0]);
> + if (verify_dir_item(root, leaf, dir_item))
> + return NULL;
> +
> + while(cur < total_len) {
> + this_len = sizeof(*dir_item) +
> + btrfs_dir_name_len(leaf, dir_item) +
> + btrfs_dir_data_len(leaf, dir_item);
> + if (this_len > (total_len - cur)) {
> + fprintf(stderr, "invalid dir item size\n");
> + return NULL;
> + }
> +
> + name_ptr = (unsigned long)(dir_item + 1);
> +
> + if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
> + memcmp_extent_buffer(leaf, name, name_ptr, name_len)
> == 0)
> + return dir_item;
> +
> + cur += this_len;
> + dir_item = (struct btrfs_dir_item *)((char *)dir_item +
> + this_len);
> + }
> + return NULL;
> +}
> +
> +struct btrfs_dir_item *btrfs_lookup_dir_item(struct
> btrfs_trans_handle *trans,
> + struct btrfs_root *root,
> + struct btrfs_path *path, u64 dir,
> + const char *name, int name_len,
> + int mod)
> +{
> + int ret;
> + struct btrfs_key key;
> + int ins_len = mod < 0 ? -1 : 0;
> + int cow = mod != 0;
> + struct btrfs_key found_key;
> + struct extent_buffer *leaf;
> +
> + key.objectid = dir;
> + key.type = BTRFS_DIR_ITEM_KEY;
> +
> + key.offset = btrfs_name_hash(name, name_len);
> +
> + ret = btrfs_search_slot(trans, root, &key, path, ins_len,
> cow);
> + if (ret < 0)
> + return ERR_PTR(ret);
> + if (ret > 0) {
> + if (path->slots[0] == 0)
> + return NULL;
> + path->slots[0]--;
> + }
> +
> + leaf = path->nodes[0];
> + btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
> +
> + if (found_key.objectid != dir ||
> + found_key.type != BTRFS_DIR_ITEM_KEY ||
> + found_key.offset != key.offset)
> + return NULL;
> +
> + return btrfs_match_dir_item_name(root, path, name, name_len);
> +}
> +
> static int __verify_dir_item(struct btrfs_dir_item *item, u32
> start, u32 total)
> {
> u16 max_len = BTRFS_NAME_LEN;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index df2f6590bb40..af4f30bbd50c 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -161,6 +161,115 @@ int __btrfs_readlink(const struct
> __btrfs_root *root, u64 inr, char *target)
> return 0;
> }
>
> +static int lookup_root_ref(struct btrfs_fs_info *fs_info,
> + u64 rootid, u64 *root_ret, u64 *dir_ret)
> +{
> + struct btrfs_root *root = fs_info->tree_root;
> + struct btrfs_root_ref *root_ref;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + btrfs_init_path(&path);
> + key.objectid = rootid;
> + key.type = BTRFS_ROOT_BACKREF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, rootid,
> BTRFS_ROOT_BACKREF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
> + struct btrfs_root_ref);
> + *root_ret = key.offset;
> + *dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * To get the parent inode of @ino of @root.
> + *
> + * @root_ret and @ino_ret will be filled.
> + *
> + * NOTE: This function is not reliable. It can only get one
> parent inode.
> + * The get the proper parent inode, we need a full VFS inodes
> stack to
> + * resolve properly.
> + */
> +static int get_parent_inode(struct btrfs_root *root, u64 ino,
> + struct btrfs_root **root_ret, u64 *ino_ret)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + if (ino == BTRFS_FIRST_FREE_OBJECTID) {
> + u64 parent_root;
> +
> + /* It's top level already, no more parent */
> + if (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) {
> + *root_ret = fs_info->fs_root;
> + *ino_ret = BTRFS_FIRST_FREE_OBJECTID;
> + return 0;
> + }
> +
> + ret = lookup_root_ref(fs_info, root->root_key.objectid,
> + &parent_root, ino_ret);
> + if (ret < 0)
> + return ret;
> +
> + key.objectid = parent_root;
> + key.type = BTRFS_ROOT_ITEM_KEY;
> + key.offset = (u64)-1;
> + *root_ret = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(*root_ret))
> + return PTR_ERR(*root_ret);
> +
> + return 0;
> + }
> +
> + btrfs_init_path(&path);
> + key.objectid = ino;
> + key.type = BTRFS_INODE_REF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, ino,
> BTRFS_INODE_REF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + *root_ret = root;
> + *ino_ret = key.offset;
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> /* inr must be a directory (for regular files with multiple
> hard links this
> function returns only one of the parents of the file) */
> static u64 __get_parent_inode(struct __btrfs_root *root, u64
> inr,
> @@ -235,6 +344,142 @@ static inline const char
> *skip_current_directories(const char *cur)
> return cur;
> }
>
> +/*
> + * Resolve one filename of @ino of @root.
> + *
> + * key_ret: The child key (either INODE_ITEM or ROOT_ITEM
> type)
> + * type_ret: BTRFS_FT_* of the child inode.
> + *
> + * Return 0 with above members filled.
> + * Return <0 for error.
> + */
> +static int resolve_one_filename(struct btrfs_root *root, u64
> ino,
> + const char *name, int namelen,
> + struct btrfs_key *key_ret, u8 *type_ret)
> +{
> + struct btrfs_dir_item *dir_item;
> + struct btrfs_path path;
> + int ret = 0;
> +
> + btrfs_init_path(&path);
> +
> + dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
> + namelen, 0);
> + if (IS_ERR(dir_item)) {
> + ret = PTR_ERR(dir_item);
> + goto out;
> + }
> +
> + btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
> + *type_ret = btrfs_dir_type(path.nodes[0], dir_item);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * Resolve a full path @filename. The start point is @ino of
> @root.
> + *
> + * The result will be filled into @root_ret, @ino_ret and
> @type_ret.
> + */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const
> char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_root *next_root;
> + struct btrfs_key key;
> + const char *cur = filename;
> + u64 next_ino;
> + u8 next_type;
> + u8 type;
> + int len;
> + int ret = 0;
> +
> + /* If the path is absolute path, also search from fs root */
> + if (*cur == '/') {
> + root = fs_info->fs_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + type = BTRFS_FT_DIR;
> + }
> +
> + while (*cur != '\0') {
> +
> + cur = skip_current_directories(cur);
> + len = next_length(cur);
> + if (len > BTRFS_NAME_LEN) {
next_length() promises @len <= BTRFS_NAME_LEN, so the check is
trivial.
> + printf("%s: Name too long at \"%.*s\"\n", __func__,
> + BTRFS_NAME_LEN, cur);
> + return -ENAMETOOLONG;
> + }
> + if (len == 1 && cur[0] == '.')
> + break;
> + /* Go one level up */
> + if (len == 2 && cur[0] == '.' && cur[1] == '.') {
> + ret = get_parent_inode(root, ino, &next_root,
> &next_ino);
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + goto next;
> + }
> + if (!*cur)
> + break;
> +
> + ret = resolve_one_filename(root, ino, cur, len, &key,
> &type);
> + if (ret < 0)
> + return ret;
> + /* Child inode is a subvolume */
> + if (key.type == BTRFS_ROOT_ITEM_KEY) {
> +
> + next_root = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(next_root))
> + return PTR_ERR(next_root);
> + root = next_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + goto next;
> + }
> + /* Child inode is a symlink */
> + if (type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
> + char *target;
> +
> + if (symlink_limit == 0) {
> + printf("%s: Too much symlinks!\n", __func__);
> + return -EMLINK;
> + }
> + target = malloc(fs_info->sectorsize);
> + if (!target)
> + return -ENOMEM;
> + ret = btrfs_readlink(root, ino, target);
> + if (ret < 0) {
> + free(target);
> + return ret;
> + }
> + target[ret] = '\0';
It was done in btrfs_readlink() already.
> +
> + ret = btrfs_lookup_path(root, ino, target, &next_root,
> + &next_ino, &next_type,
> + symlink_limit);
Just notify gentlely this is a recursive call here. I don't know
whether uboot cares about stack things. But, recursion makes
coding simpler :).
--
Su
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + type = next_type;
> + goto next;
> + }
> + /* Child inode is an inode */
> + ino = key.objectid;
> +next:
> + cur += len;
> + }
> + if (!ret) {
> + *root_ret = root;
> + *ino_ret = ino;
> + *type_ret = type;
> + }
> + return ret;
> +}
> +
> u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr,
> const char *path,
> u8 *type_p, struct btrfs_inode_item *inode_item_p,
> int symlink_limit)
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 6:50 ` Qu Wenruo
@ 2020-04-22 9:46 ` Su Yue
-1 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 9:46 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot, marek.behun
On Wed 22 Apr 2020 at 14:50, Qu Wenruo <wqu@suse.com> wrote:
> This is the extent buffer based path lookup routine.
>
> To implement this, btrfs_lookup_dir_item() is cross ported from
> btrfs-progs, and implement btrfs_lookup_path() from scratch.
>
> Unlike the existing __btrfs_lookup_path(), since btrfs_read_fs_root()
> will check whether a root is orphan at read time, there is no need to
> check root backref, this make the code a little easier to read.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> ---
> fs/btrfs/ctree.h | 4 +
> fs/btrfs/dir-item.c | 106 +++++++++++++++++++
> fs/btrfs/inode.c | 245 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 355 insertions(+)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index f702eaff293c..78f7746d1f32 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1284,6 +1284,10 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> struct btrfs_path *path, u64 dir,
> const char *name, int name_len,
> int mod);
> +/* inode.c */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit);
>
> /* ctree.c */
> int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
> index aea621c72bb3..4bf45c2fa925 100644
> --- a/fs/btrfs/dir-item.c
> +++ b/fs/btrfs/dir-item.c
> @@ -8,6 +8,112 @@
> #include "btrfs.h"
> #include "disk-io.h"
>
> +static int verify_dir_item(struct btrfs_root *root,
> + struct extent_buffer *leaf,
> + struct btrfs_dir_item *dir_item)
> +{
> + u16 namelen = BTRFS_NAME_LEN;
> + u8 type = btrfs_dir_type(leaf, dir_item);
> +
> + if (type == BTRFS_FT_XATTR)
> + namelen = XATTR_NAME_MAX;
> +
> + if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
> + fprintf(stderr, "invalid dir item name len: %u\n",
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
> + if ((btrfs_dir_data_len(leaf, dir_item) +
> + btrfs_dir_name_len(leaf, dir_item)) >
> + BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
> + fprintf(stderr, "invalid dir item name + data len: %u + %u\n",
> + (unsigned)btrfs_dir_name_len(leaf, dir_item),
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
> + struct btrfs_path *path,
> + const char *name, int name_len)
> +{
> + struct btrfs_dir_item *dir_item;
> + unsigned long name_ptr;
> + u32 total_len;
> + u32 cur = 0;
> + u32 this_len;
> + struct extent_buffer *leaf;
> +
> + leaf = path->nodes[0];
> + dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
> + total_len = btrfs_item_size_nr(leaf, path->slots[0]);
> + if (verify_dir_item(root, leaf, dir_item))
> + return NULL;
> +
> + while(cur < total_len) {
> + this_len = sizeof(*dir_item) +
> + btrfs_dir_name_len(leaf, dir_item) +
> + btrfs_dir_data_len(leaf, dir_item);
> + if (this_len > (total_len - cur)) {
> + fprintf(stderr, "invalid dir item size\n");
> + return NULL;
> + }
> +
> + name_ptr = (unsigned long)(dir_item + 1);
> +
> + if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
> + memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
> + return dir_item;
> +
> + cur += this_len;
> + dir_item = (struct btrfs_dir_item *)((char *)dir_item +
> + this_len);
> + }
> + return NULL;
> +}
> +
> +struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> + struct btrfs_root *root,
> + struct btrfs_path *path, u64 dir,
> + const char *name, int name_len,
> + int mod)
> +{
> + int ret;
> + struct btrfs_key key;
> + int ins_len = mod < 0 ? -1 : 0;
> + int cow = mod != 0;
> + struct btrfs_key found_key;
> + struct extent_buffer *leaf;
> +
> + key.objectid = dir;
> + key.type = BTRFS_DIR_ITEM_KEY;
> +
> + key.offset = btrfs_name_hash(name, name_len);
> +
> + ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
> + if (ret < 0)
> + return ERR_PTR(ret);
> + if (ret > 0) {
> + if (path->slots[0] == 0)
> + return NULL;
> + path->slots[0]--;
> + }
> +
> + leaf = path->nodes[0];
> + btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
> +
> + if (found_key.objectid != dir ||
> + found_key.type != BTRFS_DIR_ITEM_KEY ||
> + found_key.offset != key.offset)
> + return NULL;
> +
> + return btrfs_match_dir_item_name(root, path, name, name_len);
> +}
> +
> static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
> {
> u16 max_len = BTRFS_NAME_LEN;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index df2f6590bb40..af4f30bbd50c 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -161,6 +161,115 @@ int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
> return 0;
> }
>
> +static int lookup_root_ref(struct btrfs_fs_info *fs_info,
> + u64 rootid, u64 *root_ret, u64 *dir_ret)
> +{
> + struct btrfs_root *root = fs_info->tree_root;
> + struct btrfs_root_ref *root_ref;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + btrfs_init_path(&path);
> + key.objectid = rootid;
> + key.type = BTRFS_ROOT_BACKREF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, rootid, BTRFS_ROOT_BACKREF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
> + struct btrfs_root_ref);
> + *root_ret = key.offset;
> + *dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * To get the parent inode of @ino of @root.
> + *
> + * @root_ret and @ino_ret will be filled.
> + *
> + * NOTE: This function is not reliable. It can only get one parent inode.
> + * The get the proper parent inode, we need a full VFS inodes stack to
> + * resolve properly.
> + */
> +static int get_parent_inode(struct btrfs_root *root, u64 ino,
> + struct btrfs_root **root_ret, u64 *ino_ret)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + if (ino == BTRFS_FIRST_FREE_OBJECTID) {
> + u64 parent_root;
> +
> + /* It's top level already, no more parent */
> + if (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) {
> + *root_ret = fs_info->fs_root;
> + *ino_ret = BTRFS_FIRST_FREE_OBJECTID;
> + return 0;
> + }
> +
> + ret = lookup_root_ref(fs_info, root->root_key.objectid,
> + &parent_root, ino_ret);
> + if (ret < 0)
> + return ret;
> +
> + key.objectid = parent_root;
> + key.type = BTRFS_ROOT_ITEM_KEY;
> + key.offset = (u64)-1;
> + *root_ret = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(*root_ret))
> + return PTR_ERR(*root_ret);
> +
> + return 0;
> + }
> +
> + btrfs_init_path(&path);
> + key.objectid = ino;
> + key.type = BTRFS_INODE_REF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, ino, BTRFS_INODE_REF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + *root_ret = root;
> + *ino_ret = key.offset;
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> /* inr must be a directory (for regular files with multiple hard links this
> function returns only one of the parents of the file) */
> static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
> @@ -235,6 +344,142 @@ static inline const char *skip_current_directories(const char *cur)
> return cur;
> }
>
> +/*
> + * Resolve one filename of @ino of @root.
> + *
> + * key_ret: The child key (either INODE_ITEM or ROOT_ITEM type)
> + * type_ret: BTRFS_FT_* of the child inode.
> + *
> + * Return 0 with above members filled.
> + * Return <0 for error.
> + */
> +static int resolve_one_filename(struct btrfs_root *root, u64 ino,
> + const char *name, int namelen,
> + struct btrfs_key *key_ret, u8 *type_ret)
> +{
> + struct btrfs_dir_item *dir_item;
> + struct btrfs_path path;
> + int ret = 0;
> +
> + btrfs_init_path(&path);
> +
> + dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
> + namelen, 0);
> + if (IS_ERR(dir_item)) {
> + ret = PTR_ERR(dir_item);
> + goto out;
> + }
> +
> + btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
> + *type_ret = btrfs_dir_type(path.nodes[0], dir_item);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * Resolve a full path @filename. The start point is @ino of @root.
> + *
> + * The result will be filled into @root_ret, @ino_ret and @type_ret.
> + */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_root *next_root;
> + struct btrfs_key key;
> + const char *cur = filename;
> + u64 next_ino;
> + u8 next_type;
> + u8 type;
> + int len;
> + int ret = 0;
> +
> + /* If the path is absolute path, also search from fs root */
> + if (*cur == '/') {
> + root = fs_info->fs_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + type = BTRFS_FT_DIR;
> + }
> +
> + while (*cur != '\0') {
> +
> + cur = skip_current_directories(cur);
> + len = next_length(cur);
> + if (len > BTRFS_NAME_LEN) {
next_length() promises @len <= BTRFS_NAME_LEN, so the check is trivial.
> + printf("%s: Name too long at \"%.*s\"\n", __func__,
> + BTRFS_NAME_LEN, cur);
> + return -ENAMETOOLONG;
> + }
> + if (len == 1 && cur[0] == '.')
> + break;
> + /* Go one level up */
> + if (len == 2 && cur[0] == '.' && cur[1] == '.') {
> + ret = get_parent_inode(root, ino, &next_root, &next_ino);
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + goto next;
> + }
> + if (!*cur)
> + break;
> +
> + ret = resolve_one_filename(root, ino, cur, len, &key, &type);
> + if (ret < 0)
> + return ret;
> + /* Child inode is a subvolume */
> + if (key.type == BTRFS_ROOT_ITEM_KEY) {
> +
> + next_root = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(next_root))
> + return PTR_ERR(next_root);
> + root = next_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + goto next;
> + }
> + /* Child inode is a symlink */
> + if (type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
> + char *target;
> +
> + if (symlink_limit == 0) {
> + printf("%s: Too much symlinks!\n", __func__);
> + return -EMLINK;
> + }
> + target = malloc(fs_info->sectorsize);
> + if (!target)
> + return -ENOMEM;
> + ret = btrfs_readlink(root, ino, target);
> + if (ret < 0) {
> + free(target);
> + return ret;
> + }
> + target[ret] = '\0';
It was done in btrfs_readlink() already.
> +
> + ret = btrfs_lookup_path(root, ino, target, &next_root,
> + &next_ino, &next_type,
> + symlink_limit);
Just notify gentlely this is a recursive call here. I don't know
whether uboot cares about stack things. But, recursion makes coding simpler :).
--
Su
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + type = next_type;
> + goto next;
> + }
> + /* Child inode is an inode */
> + ino = key.objectid;
> +next:
> + cur += len;
> + }
> + if (!ret) {
> + *root_ret = root;
> + *ino_ret = ino;
> + *type_ret = type;
> + }
> + return ret;
> +}
> +
> u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
> u8 *type_p, struct btrfs_inode_item *inode_item_p,
> int symlink_limit)
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 9:46 ` Su Yue
0 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 9:46 UTC (permalink / raw)
To: u-boot
On Wed 22 Apr 2020 at 14:50, Qu Wenruo <wqu@suse.com> wrote:
> This is the extent buffer based path lookup routine.
>
> To implement this, btrfs_lookup_dir_item() is cross ported from
> btrfs-progs, and implement btrfs_lookup_path() from scratch.
>
> Unlike the existing __btrfs_lookup_path(), since btrfs_read_fs_root()
> will check whether a root is orphan at read time, there is no need to
> check root backref, this make the code a little easier to read.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com>
> ---
> fs/btrfs/ctree.h | 4 +
> fs/btrfs/dir-item.c | 106 +++++++++++++++++++
> fs/btrfs/inode.c | 245 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 355 insertions(+)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index f702eaff293c..78f7746d1f32 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -1284,6 +1284,10 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> struct btrfs_path *path, u64 dir,
> const char *name, int name_len,
> int mod);
> +/* inode.c */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit);
>
> /* ctree.c */
> int btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2);
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
> index aea621c72bb3..4bf45c2fa925 100644
> --- a/fs/btrfs/dir-item.c
> +++ b/fs/btrfs/dir-item.c
> @@ -8,6 +8,112 @@
> #include "btrfs.h"
> #include "disk-io.h"
>
> +static int verify_dir_item(struct btrfs_root *root,
> + struct extent_buffer *leaf,
> + struct btrfs_dir_item *dir_item)
> +{
> + u16 namelen = BTRFS_NAME_LEN;
> + u8 type = btrfs_dir_type(leaf, dir_item);
> +
> + if (type == BTRFS_FT_XATTR)
> + namelen = XATTR_NAME_MAX;
> +
> + if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
> + fprintf(stderr, "invalid dir item name len: %u\n",
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
> + if ((btrfs_dir_data_len(leaf, dir_item) +
> + btrfs_dir_name_len(leaf, dir_item)) >
> + BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
> + fprintf(stderr, "invalid dir item name + data len: %u + %u\n",
> + (unsigned)btrfs_dir_name_len(leaf, dir_item),
> + (unsigned)btrfs_dir_data_len(leaf, dir_item));
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
> + struct btrfs_path *path,
> + const char *name, int name_len)
> +{
> + struct btrfs_dir_item *dir_item;
> + unsigned long name_ptr;
> + u32 total_len;
> + u32 cur = 0;
> + u32 this_len;
> + struct extent_buffer *leaf;
> +
> + leaf = path->nodes[0];
> + dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
> + total_len = btrfs_item_size_nr(leaf, path->slots[0]);
> + if (verify_dir_item(root, leaf, dir_item))
> + return NULL;
> +
> + while(cur < total_len) {
> + this_len = sizeof(*dir_item) +
> + btrfs_dir_name_len(leaf, dir_item) +
> + btrfs_dir_data_len(leaf, dir_item);
> + if (this_len > (total_len - cur)) {
> + fprintf(stderr, "invalid dir item size\n");
> + return NULL;
> + }
> +
> + name_ptr = (unsigned long)(dir_item + 1);
> +
> + if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
> + memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
> + return dir_item;
> +
> + cur += this_len;
> + dir_item = (struct btrfs_dir_item *)((char *)dir_item +
> + this_len);
> + }
> + return NULL;
> +}
> +
> +struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> + struct btrfs_root *root,
> + struct btrfs_path *path, u64 dir,
> + const char *name, int name_len,
> + int mod)
> +{
> + int ret;
> + struct btrfs_key key;
> + int ins_len = mod < 0 ? -1 : 0;
> + int cow = mod != 0;
> + struct btrfs_key found_key;
> + struct extent_buffer *leaf;
> +
> + key.objectid = dir;
> + key.type = BTRFS_DIR_ITEM_KEY;
> +
> + key.offset = btrfs_name_hash(name, name_len);
> +
> + ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
> + if (ret < 0)
> + return ERR_PTR(ret);
> + if (ret > 0) {
> + if (path->slots[0] == 0)
> + return NULL;
> + path->slots[0]--;
> + }
> +
> + leaf = path->nodes[0];
> + btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
> +
> + if (found_key.objectid != dir ||
> + found_key.type != BTRFS_DIR_ITEM_KEY ||
> + found_key.offset != key.offset)
> + return NULL;
> +
> + return btrfs_match_dir_item_name(root, path, name, name_len);
> +}
> +
> static int __verify_dir_item(struct btrfs_dir_item *item, u32 start, u32 total)
> {
> u16 max_len = BTRFS_NAME_LEN;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index df2f6590bb40..af4f30bbd50c 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -161,6 +161,115 @@ int __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char *target)
> return 0;
> }
>
> +static int lookup_root_ref(struct btrfs_fs_info *fs_info,
> + u64 rootid, u64 *root_ret, u64 *dir_ret)
> +{
> + struct btrfs_root *root = fs_info->tree_root;
> + struct btrfs_root_ref *root_ref;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + btrfs_init_path(&path);
> + key.objectid = rootid;
> + key.type = BTRFS_ROOT_BACKREF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, rootid, BTRFS_ROOT_BACKREF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
> + struct btrfs_root_ref);
> + *root_ret = key.offset;
> + *dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * To get the parent inode of @ino of @root.
> + *
> + * @root_ret and @ino_ret will be filled.
> + *
> + * NOTE: This function is not reliable. It can only get one parent inode.
> + * The get the proper parent inode, we need a full VFS inodes stack to
> + * resolve properly.
> + */
> +static int get_parent_inode(struct btrfs_root *root, u64 ino,
> + struct btrfs_root **root_ret, u64 *ino_ret)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_path path;
> + struct btrfs_key key;
> + int ret;
> +
> + if (ino == BTRFS_FIRST_FREE_OBJECTID) {
> + u64 parent_root;
> +
> + /* It's top level already, no more parent */
> + if (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) {
> + *root_ret = fs_info->fs_root;
> + *ino_ret = BTRFS_FIRST_FREE_OBJECTID;
> + return 0;
> + }
> +
> + ret = lookup_root_ref(fs_info, root->root_key.objectid,
> + &parent_root, ino_ret);
> + if (ret < 0)
> + return ret;
> +
> + key.objectid = parent_root;
> + key.type = BTRFS_ROOT_ITEM_KEY;
> + key.offset = (u64)-1;
> + *root_ret = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(*root_ret))
> + return PTR_ERR(*root_ret);
> +
> + return 0;
> + }
> +
> + btrfs_init_path(&path);
> + key.objectid = ino;
> + key.type = BTRFS_INODE_REF_KEY;
> + key.offset = (u64)-1;
> +
> + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
> + if (ret < 0)
> + return ret;
> + /* Should not happen */
> + if (ret == 0) {
> + ret = -EUCLEAN;
> + goto out;
> + }
> + ret = btrfs_previous_item(root, &path, ino, BTRFS_INODE_REF_KEY);
> + if (ret < 0)
> + goto out;
> + if (ret > 0) {
> + ret = -ENOENT;
> + goto out;
> + }
> + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
> + *root_ret = root;
> + *ino_ret = key.offset;
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> /* inr must be a directory (for regular files with multiple hard links this
> function returns only one of the parents of the file) */
> static u64 __get_parent_inode(struct __btrfs_root *root, u64 inr,
> @@ -235,6 +344,142 @@ static inline const char *skip_current_directories(const char *cur)
> return cur;
> }
>
> +/*
> + * Resolve one filename of @ino of @root.
> + *
> + * key_ret: The child key (either INODE_ITEM or ROOT_ITEM type)
> + * type_ret: BTRFS_FT_* of the child inode.
> + *
> + * Return 0 with above members filled.
> + * Return <0 for error.
> + */
> +static int resolve_one_filename(struct btrfs_root *root, u64 ino,
> + const char *name, int namelen,
> + struct btrfs_key *key_ret, u8 *type_ret)
> +{
> + struct btrfs_dir_item *dir_item;
> + struct btrfs_path path;
> + int ret = 0;
> +
> + btrfs_init_path(&path);
> +
> + dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
> + namelen, 0);
> + if (IS_ERR(dir_item)) {
> + ret = PTR_ERR(dir_item);
> + goto out;
> + }
> +
> + btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
> + *type_ret = btrfs_dir_type(path.nodes[0], dir_item);
> +out:
> + btrfs_release_path(&path);
> + return ret;
> +}
> +
> +/*
> + * Resolve a full path @filename. The start point is @ino of @root.
> + *
> + * The result will be filled into @root_ret, @ino_ret and @type_ret.
> + */
> +int btrfs_lookup_path(struct btrfs_root *root, u64 ino, const char *filename,
> + struct btrfs_root **root_ret, u64 *ino_ret,
> + u8 *type_ret, int symlink_limit)
> +{
> + struct btrfs_fs_info *fs_info = root->fs_info;
> + struct btrfs_root *next_root;
> + struct btrfs_key key;
> + const char *cur = filename;
> + u64 next_ino;
> + u8 next_type;
> + u8 type;
> + int len;
> + int ret = 0;
> +
> + /* If the path is absolute path, also search from fs root */
> + if (*cur == '/') {
> + root = fs_info->fs_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + type = BTRFS_FT_DIR;
> + }
> +
> + while (*cur != '\0') {
> +
> + cur = skip_current_directories(cur);
> + len = next_length(cur);
> + if (len > BTRFS_NAME_LEN) {
next_length() promises @len <= BTRFS_NAME_LEN, so the check is trivial.
> + printf("%s: Name too long at \"%.*s\"\n", __func__,
> + BTRFS_NAME_LEN, cur);
> + return -ENAMETOOLONG;
> + }
> + if (len == 1 && cur[0] == '.')
> + break;
> + /* Go one level up */
> + if (len == 2 && cur[0] == '.' && cur[1] == '.') {
> + ret = get_parent_inode(root, ino, &next_root, &next_ino);
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + goto next;
> + }
> + if (!*cur)
> + break;
> +
> + ret = resolve_one_filename(root, ino, cur, len, &key, &type);
> + if (ret < 0)
> + return ret;
> + /* Child inode is a subvolume */
> + if (key.type == BTRFS_ROOT_ITEM_KEY) {
> +
> + next_root = btrfs_read_fs_root(fs_info, &key);
> + if (IS_ERR(next_root))
> + return PTR_ERR(next_root);
> + root = next_root;
> + ino = btrfs_root_dirid(&root->root_item);
> + goto next;
> + }
> + /* Child inode is a symlink */
> + if (type == BTRFS_FT_SYMLINK && symlink_limit >= 0) {
> + char *target;
> +
> + if (symlink_limit == 0) {
> + printf("%s: Too much symlinks!\n", __func__);
> + return -EMLINK;
> + }
> + target = malloc(fs_info->sectorsize);
> + if (!target)
> + return -ENOMEM;
> + ret = btrfs_readlink(root, ino, target);
> + if (ret < 0) {
> + free(target);
> + return ret;
> + }
> + target[ret] = '\0';
It was done in btrfs_readlink() already.
> +
> + ret = btrfs_lookup_path(root, ino, target, &next_root,
> + &next_ino, &next_type,
> + symlink_limit);
Just notify gentlely this is a recursive call here. I don't know
whether uboot cares about stack things. But, recursion makes coding simpler :).
--
Su
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + type = next_type;
> + goto next;
> + }
> + /* Child inode is an inode */
> + ino = key.objectid;
> +next:
> + cur += len;
> + }
> + if (!ret) {
> + *root_ret = root;
> + *ino_ret = ino;
> + *type_ret = type;
> + }
> + return ret;
> +}
> +
> u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
> u8 *type_p, struct btrfs_inode_item *inode_item_p,
> int symlink_limit)
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 9:46 ` Su Yue
@ 2020-04-22 10:04 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 10:04 UTC (permalink / raw)
To: Su Yue; +Cc: Qu Wenruo, linux-btrfs, fstests, u-boot
On Wed, 22 Apr 2020 17:46:25 +0800
Su Yue <Damenly_Su@gmx.com> wrote:
> > + while (*cur != '\0') {
> > +
> > + cur = skip_current_directories(cur);
> > + len = next_length(cur);
> > + if (len > BTRFS_NAME_LEN) {
>
> next_length() promises @len <= BTRFS_NAME_LEN, so the check is trivial.
Hmm. This is a bug in next_length. I meant for next_length to return
len > BTRFS_NAME_LEN in case of too long name. Thanks for noticing.
> > + ret = btrfs_readlink(root, ino, target);
> > + if (ret < 0) {
> > + free(target);
> > + return ret;
> > + }
> > + target[ret] = '\0';
>
> It was done in btrfs_readlink() already.
It is in old btrfs_readlink, but is it even after this patches? I don't
see it in the new implementation.
> > +
> > + ret = btrfs_lookup_path(root, ino, target, &next_root,
> > + &next_ino, &next_type,
> > + symlink_limit);
>
> Just notify gentlely this is a recursive call here. I don't know
> whether uboot cares about stack things. But, recursion makes coding simpler :).
It is limited by symlink_limit. Until somebody complains about stack
issues I would like to keep it simple.
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 10:04 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 10:04 UTC (permalink / raw)
To: u-boot
On Wed, 22 Apr 2020 17:46:25 +0800
Su Yue <Damenly_Su@gmx.com> wrote:
> > + while (*cur != '\0') {
> > +
> > + cur = skip_current_directories(cur);
> > + len = next_length(cur);
> > + if (len > BTRFS_NAME_LEN) {
>
> next_length() promises @len <= BTRFS_NAME_LEN, so the check is trivial.
Hmm. This is a bug in next_length. I meant for next_length to return
len > BTRFS_NAME_LEN in case of too long name. Thanks for noticing.
> > + ret = btrfs_readlink(root, ino, target);
> > + if (ret < 0) {
> > + free(target);
> > + return ret;
> > + }
> > + target[ret] = '\0';
>
> It was done in btrfs_readlink() already.
It is in old btrfs_readlink, but is it even after this patches? I don't
see it in the new implementation.
> > +
> > + ret = btrfs_lookup_path(root, ino, target, &next_root,
> > + &next_ino, &next_type,
> > + symlink_limit);
>
> Just notify gentlely this is a recursive call here. I don't know
> whether uboot cares about stack things. But, recursion makes coding simpler :).
It is limited by symlink_limit. Until somebody complains about stack
issues I would like to keep it simple.
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 10:04 ` Marek Behun
@ 2020-04-22 14:17 ` Su Yue
-1 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 14:17 UTC (permalink / raw)
To: Marek Behun; +Cc: Qu Wenruo, linux-btrfs, fstests, u-boot
On Wed 22 Apr 2020 at 18:04, Marek Behun <marek.behun@nic.cz>
wrote:
> On Wed, 22 Apr 2020 17:46:25 +0800 Su Yue <Damenly_Su@gmx.com>
> wrote:
>
>> > + while (*cur != '\0') { + + cur =
>> > skip_current_directories(cur); + len =
>> > next_length(cur); + if (len > BTRFS_NAME_LEN) {
>> next_length() promises @len <= BTRFS_NAME_LEN, so the check is
>> trivial.
>
Okay.
> Hmm. This is a bug in next_length. I meant for next_length to
> return len > BTRFS_NAME_LEN in case of too long name. Thanks for
> noticing.
>
>> > + ret = btrfs_readlink(root, ino, target); +
>> > if (ret < 0) { + free(target); +
>> > return ret; + } + target[ret] = '\0';
>> It was done in btrfs_readlink() already.
>
> It is in old btrfs_readlink, but is it even after this patches?
> I don't see it in the new implementation.
>
You are right. The thing changed in the 17th patch.
btrfs_readlink()
doesn't set the null byte now.
--
Su
>> > +
>> > + ret = btrfs_lookup_path(root, ino, target, &next_root,
>> > + &next_ino, &next_type,
>> > + symlink_limit);
>>
>> Just notify gentlely this is a recursive call here. I don't know
>> whether uboot cares about stack things. But, recursion makes coding simpler :).
>
> It is limited by symlink_limit. Until somebody complains about stack
> issues I would like to keep it simple.
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 14:17 ` Su Yue
0 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 14:17 UTC (permalink / raw)
To: u-boot
On Wed 22 Apr 2020 at 18:04, Marek Behun <marek.behun@nic.cz>
wrote:
> On Wed, 22 Apr 2020 17:46:25 +0800 Su Yue <Damenly_Su@gmx.com>
> wrote:
>
>> > + while (*cur != '\0') { + + cur =
>> > skip_current_directories(cur); + len =
>> > next_length(cur); + if (len > BTRFS_NAME_LEN) {
>> next_length() promises @len <= BTRFS_NAME_LEN, so the check is
>> trivial.
>
Okay.
> Hmm. This is a bug in next_length. I meant for next_length to
> return len > BTRFS_NAME_LEN in case of too long name. Thanks for
> noticing.
>
>> > + ret = btrfs_readlink(root, ino, target); +
>> > if (ret < 0) { + free(target); +
>> > return ret; + } + target[ret] = '\0';
>> It was done in btrfs_readlink() already.
>
> It is in old btrfs_readlink, but is it even after this patches?
> I don't see it in the new implementation.
>
You are right. The thing changed in the 17th patch.
btrfs_readlink()
doesn't set the null byte now.
--
Su
>> > +
>> > + ret = btrfs_lookup_path(root, ino, target, &next_root,
>> > + &next_ino, &next_type,
>> > + symlink_limit);
>>
>> Just notify gentlely this is a recursive call here. I don't know
>> whether uboot cares about stack things. But, recursion makes coding simpler :).
>
> It is limited by symlink_limit. Until somebody complains about stack
> issues I would like to keep it simple.
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 6:50 ` Qu Wenruo
@ 2020-04-22 14:44 ` Su Yue
-1 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 14:44 UTC (permalink / raw)
To: Qu Wenruo; +Cc: linux-btrfs, fstests, u-boot, marek.behun
On Wed 22 Apr 2020 at 14:50, Qu Wenruo <wqu@suse.com> wrote:
> This is the extent buffer based path lookup routine.
>
> To implement this, btrfs_lookup_dir_item() is cross ported from
> btrfs-progs, and implement btrfs_lookup_path() from scratch.
>
> Unlike the existing __btrfs_lookup_path(), since
> btrfs_read_fs_root() will check whether a root is orphan at read
> time, there is no need to check root backref, this make the code
> a little easier to read.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com> ---
> fs/btrfs/ctree.h | 4 + fs/btrfs/dir-item.c | 106
> +++++++++++++++++++ fs/btrfs/inode.c | 245
> ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed,
> 355 insertions(+)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index
> f702eaff293c..78f7746d1f32 100644 --- a/fs/btrfs/ctree.h +++
> b/fs/btrfs/ctree.h @@ -1284,6 +1284,10 @@ struct btrfs_dir_item
> *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> struct btrfs_path *path, u64 dir, const
> char *name, int name_len, int mod);
> +/* inode.c */ +int btrfs_lookup_path(struct btrfs_root *root,
> u64 ino, const char *filename, + struct btrfs_root
> **root_ret, u64 *ino_ret, + u8 *type_ret, int
> symlink_limit);
> /* ctree.c */ int btrfs_comp_cpu_keys(const struct btrfs_key
> *k1, const struct btrfs_key *k2);
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index
> aea621c72bb3..4bf45c2fa925 100644 --- a/fs/btrfs/dir-item.c +++
> b/fs/btrfs/dir-item.c @@ -8,6 +8,112 @@
> #include "btrfs.h" #include "disk-io.h"
> +static int verify_dir_item(struct btrfs_root *root, +
> struct extent_buffer *leaf, + struct btrfs_dir_item
> *dir_item) +{ + u16 namelen = BTRFS_NAME_LEN; + u8 type =
> btrfs_dir_type(leaf, dir_item); + + if (type ==
> BTRFS_FT_XATTR) + namelen = XATTR_NAME_MAX; + + if
> (btrfs_dir_name_len(leaf, dir_item) > namelen) { +
> fprintf(stderr, "invalid dir item name len: %u\n", +
> (unsigned)btrfs_dir_data_len(leaf, dir_item)); + return 1;
> + } + + /* BTRFS_MAX_XATTR_SIZE is the same for all dir items
> */ + if ((btrfs_dir_data_len(leaf, dir_item) + +
> btrfs_dir_name_len(leaf, dir_item)) > +
> BTRFS_MAX_XATTR_SIZE(root->fs_info)) { + fprintf(stderr,
> "invalid dir item name + data len: %u + %u\n", +
> (unsigned)btrfs_dir_name_len(leaf, dir_item), +
> (unsigned)btrfs_dir_data_len(leaf, dir_item)); + return 1;
> + } + + return 0; +} + +struct btrfs_dir_item
> *btrfs_match_dir_item_name(struct btrfs_root *root, +
> struct btrfs_path *path, + const char *name,
> int name_len) +{ + struct btrfs_dir_item *dir_item; +
> unsigned long name_ptr; + u32 total_len; + u32 cur = 0; +
> u32 this_len; + struct extent_buffer *leaf; + + leaf =
> path->nodes[0]; + dir_item = btrfs_item_ptr(leaf,
> path->slots[0], struct btrfs_dir_item); + total_len =
> btrfs_item_size_nr(leaf, path->slots[0]); + if
> (verify_dir_item(root, leaf, dir_item)) + return NULL; + +
> while(cur < total_len) { + this_len = sizeof(*dir_item) +
> + btrfs_dir_name_len(leaf, dir_item) + +
> btrfs_dir_data_len(leaf, dir_item); + if (this_len >
> (total_len - cur)) { + fprintf(stderr, "invalid dir
> item size\n"); + return NULL; + } + +
> name_ptr = (unsigned long)(dir_item + 1); + + if
> (btrfs_dir_name_len(leaf, dir_item) == name_len && +
> memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) +
> return dir_item; + + cur += this_len; + dir_item =
> (struct btrfs_dir_item *)((char *)dir_item + +
> this_len); + } + return NULL; +} + +struct btrfs_dir_item
> *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, +
> struct btrfs_root *root, + struct
> btrfs_path *path, u64 dir, + const char
> *name, int name_len, + int mod) +{ +
> int ret; + struct btrfs_key key; + int ins_len = mod < 0 ? -1
> : 0; + int cow = mod != 0; + struct btrfs_key found_key; +
> struct extent_buffer *leaf; + + key.objectid = dir; +
> key.type = BTRFS_DIR_ITEM_KEY; + + key.offset =
> btrfs_name_hash(name, name_len); + + ret =
> btrfs_search_slot(trans, root, &key, path, ins_len, cow); + if
> (ret < 0) + return ERR_PTR(ret); + if (ret > 0) { +
> if (path->slots[0] == 0) + return NULL; +
> path->slots[0]--; + } + + leaf = path->nodes[0]; +
> btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); + + if
> (found_key.objectid != dir || + found_key.type !=
> BTRFS_DIR_ITEM_KEY || + found_key.offset != key.offset) +
> return NULL; + + return btrfs_match_dir_item_name(root, path,
> name, name_len); +} +
> static int __verify_dir_item(struct btrfs_dir_item *item, u32
> start, u32 total) { u16 max_len = BTRFS_NAME_LEN;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index
> df2f6590bb40..af4f30bbd50c 100644 --- a/fs/btrfs/inode.c +++
> b/fs/btrfs/inode.c @@ -161,6 +161,115 @@ int
> __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char
> *target)
> return 0; }
> +static int lookup_root_ref(struct btrfs_fs_info *fs_info, +
> u64 rootid, u64 *root_ret, u64 *dir_ret) +{ + struct btrfs_root
> *root = fs_info->tree_root; + struct btrfs_root_ref *root_ref; +
> struct btrfs_path path; + struct btrfs_key key; + int ret; + +
> btrfs_init_path(&path); + key.objectid = rootid; + key.type =
> BTRFS_ROOT_BACKREF_KEY; + key.offset = (u64)-1; + + ret =
> btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret <
> 0) + return ret; + /* Should not happen */ + if (ret ==
> 0) { + ret = -EUCLEAN; + goto out; + } + ret =
> btrfs_previous_item(root, &path, rootid,
> BTRFS_ROOT_BACKREF_KEY); + if (ret < 0) + goto out; + if
> (ret > 0) { + ret = -ENOENT; + goto out; + } +
> btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); +
> root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0], +
> struct btrfs_root_ref); + *root_ret = key.offset; + *dir_ret =
> btrfs_root_ref_dirid(path.nodes[0], root_ref); +out: +
> btrfs_release_path(&path); + return ret; +} + +/* + * To get
> the parent inode of @ino of @root. + * + * @root_ret and
> @ino_ret will be filled. + * + * NOTE: This function is not
> reliable. It can only get one parent inode. + * The get the
> proper parent inode, we need a full VFS inodes stack to + *
> resolve properly. + */ +static int get_parent_inode(struct
> btrfs_root *root, u64 ino, + struct btrfs_root
> **root_ret, u64 *ino_ret) +{ + struct btrfs_fs_info *fs_info
> = root->fs_info; + struct btrfs_path path; + struct
> btrfs_key key; + int ret; + + if (ino ==
> BTRFS_FIRST_FREE_OBJECTID) { + u64 parent_root; + +
> /* It's top level already, no more parent */ + if
> (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) { +
> *root_ret = fs_info->fs_root; + *ino_ret =
> BTRFS_FIRST_FREE_OBJECTID; + return 0; + } + +
> ret = lookup_root_ref(fs_info, root->root_key.objectid, +
> &parent_root, ino_ret); + if (ret < 0) + return
> ret; + + key.objectid = parent_root; + key.type =
> BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; +
> *root_ret = btrfs_read_fs_root(fs_info, &key); + if
> (IS_ERR(*root_ret)) + return PTR_ERR(*root_ret); + +
> return 0; + } + + btrfs_init_path(&path); + key.objectid =
> ino; + key.type = BTRFS_INODE_REF_KEY; + key.offset =
> (u64)-1; + + ret = btrfs_search_slot(NULL, root, &key, &path,
> 0, 0); + if (ret < 0) + return ret; + /* Should not
> happen */ + if (ret == 0) { + ret = -EUCLEAN; +
> goto out; + } + ret = btrfs_previous_item(root, &path, ino,
> BTRFS_INODE_REF_KEY); + if (ret < 0) + goto out; + if
> (ret > 0) { + ret = -ENOENT; + goto out; + } +
> btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); +
> *root_ret = root; + *ino_ret = key.offset; +out: +
> btrfs_release_path(&path); + return ret; +} +
> /* inr must be a directory (for regular files with multiple
> hard links this
> function returns only one of the parents of the file) */
> static u64 __get_parent_inode(struct __btrfs_root *root, u64
> inr,
> @@ -235,6 +344,142 @@ static inline const char
> *skip_current_directories(const char *cur)
> return cur; }
> +/* + * Resolve one filename of @ino of @root. + * + * key_ret:
> The child key (either INODE_ITEM or ROOT_ITEM type) + *
> type_ret: BTRFS_FT_* of the child inode. + * + * Return 0 with
> above members filled. + * Return <0 for error. + */ +static
> int resolve_one_filename(struct btrfs_root *root, u64 ino, +
> const char *name, int namelen, + struct btrfs_key
> *key_ret, u8 *type_ret) +{ + struct btrfs_dir_item *dir_item; +
> struct btrfs_path path; + int ret = 0; + +
> btrfs_init_path(&path); + + dir_item =
> btrfs_lookup_dir_item(NULL, root, &path, ino, name, +
> namelen, 0); + if (IS_ERR(dir_item)) { + ret =
> PTR_ERR(dir_item); + goto out; + } + +
> btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret); +
> *type_ret = btrfs_dir_type(path.nodes[0], dir_item); +out: +
> btrfs_release_path(&path); + return ret; +} + +/* + * Resolve a
> full path @filename. The start point is @ino of @root. + * + *
> The result will be filled into @root_ret, @ino_ret and
> @type_ret. + */ +int btrfs_lookup_path(struct btrfs_root *root,
> u64 ino, const char *filename, + struct btrfs_root
> **root_ret, u64 *ino_ret, + u8 *type_ret, int
> symlink_limit) +{ + struct btrfs_fs_info *fs_info =
> root->fs_info; + struct btrfs_root *next_root; + struct
> btrfs_key key; + const char *cur = filename; + u64 next_ino;
> + u8 next_type; + u8 type; + int len; + int ret = 0; + + /*
> If the path is absolute path, also search from fs root */ + if
> (*cur == '/') { + root = fs_info->fs_root; + ino =
> btrfs_root_dirid(&root->root_item); + type = BTRFS_FT_DIR; +
> } + + while (*cur != '\0') { + + cur =
> skip_current_directories(cur); + len = next_length(cur); +
> if (len > BTRFS_NAME_LEN) { + printf("%s: Name too long
> at \"%.*s\"\n", __func__, + BTRFS_NAME_LEN,
> cur); + return -ENAMETOOLONG; + } + if (len ==
> 1 && cur[0] == '.') + break; + /* Go one
> level up */ + if (len == 2 && cur[0] == '.' && cur[1] ==
> '.') { + ret = get_parent_inode(root, ino, &next_root,
> &next_ino); + if (ret < 0) + return ret; +
> root = next_root; + ino = next_ino; + goto
> next; + } + if (!*cur) + break; + +
> ret = resolve_one_filename(root, ino, cur, len, &key, &type); +
> if (ret < 0) + return ret; + /* Child inode is
> a subvolume */ + if (key.type == BTRFS_ROOT_ITEM_KEY) { + +
> next_root = btrfs_read_fs_root(fs_info, &key); + if
> (IS_ERR(next_root)) + return PTR_ERR(next_root); +
> root = next_root; + ino =
> btrfs_root_dirid(&root->root_item); + goto next; +
> } + /* Child inode is a symlink */ + if (type ==
> BTRFS_FT_SYMLINK && symlink_limit >= 0) { + char
> *target; + + if (symlink_limit == 0) { +
> printf("%s: Too much symlinks!\n", __func__); +
> return -EMLINK; + } + target =
> malloc(fs_info->sectorsize); + if (!target) +
> return -ENOMEM; + ret = btrfs_readlink(root, ino,
> target); + if (ret < 0) { +
> free(target); + return ret; + } +
> target[ret] = '\0'; + + ret = btrfs_lookup_path(root,
> ino, target, &next_root, + &next_ino,
> &next_type, + symlink_limit);
Looked through older codes, should be "symlink_limit - 1"?
--
Su
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + type = next_type;
> + goto next;
> + }
> + /* Child inode is an inode */
> + ino = key.objectid;
> +next:
> + cur += len;
> + }
> + if (!ret) {
> + *root_ret = root;
> + *ino_ret = ino;
> + *type_ret = type;
> + }
> + return ret;
> +}
> +
> u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
> u8 *type_p, struct btrfs_inode_item *inode_item_p,
> int symlink_limit)
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 14:44 ` Su Yue
0 siblings, 0 replies; 85+ messages in thread
From: Su Yue @ 2020-04-22 14:44 UTC (permalink / raw)
To: u-boot
On Wed 22 Apr 2020 at 14:50, Qu Wenruo <wqu@suse.com> wrote:
> This is the extent buffer based path lookup routine.
>
> To implement this, btrfs_lookup_dir_item() is cross ported from
> btrfs-progs, and implement btrfs_lookup_path() from scratch.
>
> Unlike the existing __btrfs_lookup_path(), since
> btrfs_read_fs_root() will check whether a root is orphan at read
> time, there is no need to check root backref, this make the code
> a little easier to read.
>
> Signed-off-by: Qu Wenruo <wqu@suse.com> ---
> fs/btrfs/ctree.h | 4 + fs/btrfs/dir-item.c | 106
> +++++++++++++++++++ fs/btrfs/inode.c | 245
> ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed,
> 355 insertions(+)
>
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index
> f702eaff293c..78f7746d1f32 100644 --- a/fs/btrfs/ctree.h +++
> b/fs/btrfs/ctree.h @@ -1284,6 +1284,10 @@ struct btrfs_dir_item
> *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
> struct btrfs_path *path, u64 dir, const
> char *name, int name_len, int mod);
> +/* inode.c */ +int btrfs_lookup_path(struct btrfs_root *root,
> u64 ino, const char *filename, + struct btrfs_root
> **root_ret, u64 *ino_ret, + u8 *type_ret, int
> symlink_limit);
> /* ctree.c */ int btrfs_comp_cpu_keys(const struct btrfs_key
> *k1, const struct btrfs_key *k2);
> diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index
> aea621c72bb3..4bf45c2fa925 100644 --- a/fs/btrfs/dir-item.c +++
> b/fs/btrfs/dir-item.c @@ -8,6 +8,112 @@
> #include "btrfs.h" #include "disk-io.h"
> +static int verify_dir_item(struct btrfs_root *root, +
> struct extent_buffer *leaf, + struct btrfs_dir_item
> *dir_item) +{ + u16 namelen = BTRFS_NAME_LEN; + u8 type =
> btrfs_dir_type(leaf, dir_item); + + if (type ==
> BTRFS_FT_XATTR) + namelen = XATTR_NAME_MAX; + + if
> (btrfs_dir_name_len(leaf, dir_item) > namelen) { +
> fprintf(stderr, "invalid dir item name len: %u\n", +
> (unsigned)btrfs_dir_data_len(leaf, dir_item)); + return 1;
> + } + + /* BTRFS_MAX_XATTR_SIZE is the same for all dir items
> */ + if ((btrfs_dir_data_len(leaf, dir_item) + +
> btrfs_dir_name_len(leaf, dir_item)) > +
> BTRFS_MAX_XATTR_SIZE(root->fs_info)) { + fprintf(stderr,
> "invalid dir item name + data len: %u + %u\n", +
> (unsigned)btrfs_dir_name_len(leaf, dir_item), +
> (unsigned)btrfs_dir_data_len(leaf, dir_item)); + return 1;
> + } + + return 0; +} + +struct btrfs_dir_item
> *btrfs_match_dir_item_name(struct btrfs_root *root, +
> struct btrfs_path *path, + const char *name,
> int name_len) +{ + struct btrfs_dir_item *dir_item; +
> unsigned long name_ptr; + u32 total_len; + u32 cur = 0; +
> u32 this_len; + struct extent_buffer *leaf; + + leaf =
> path->nodes[0]; + dir_item = btrfs_item_ptr(leaf,
> path->slots[0], struct btrfs_dir_item); + total_len =
> btrfs_item_size_nr(leaf, path->slots[0]); + if
> (verify_dir_item(root, leaf, dir_item)) + return NULL; + +
> while(cur < total_len) { + this_len = sizeof(*dir_item) +
> + btrfs_dir_name_len(leaf, dir_item) + +
> btrfs_dir_data_len(leaf, dir_item); + if (this_len >
> (total_len - cur)) { + fprintf(stderr, "invalid dir
> item size\n"); + return NULL; + } + +
> name_ptr = (unsigned long)(dir_item + 1); + + if
> (btrfs_dir_name_len(leaf, dir_item) == name_len && +
> memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) +
> return dir_item; + + cur += this_len; + dir_item =
> (struct btrfs_dir_item *)((char *)dir_item + +
> this_len); + } + return NULL; +} + +struct btrfs_dir_item
> *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, +
> struct btrfs_root *root, + struct
> btrfs_path *path, u64 dir, + const char
> *name, int name_len, + int mod) +{ +
> int ret; + struct btrfs_key key; + int ins_len = mod < 0 ? -1
> : 0; + int cow = mod != 0; + struct btrfs_key found_key; +
> struct extent_buffer *leaf; + + key.objectid = dir; +
> key.type = BTRFS_DIR_ITEM_KEY; + + key.offset =
> btrfs_name_hash(name, name_len); + + ret =
> btrfs_search_slot(trans, root, &key, path, ins_len, cow); + if
> (ret < 0) + return ERR_PTR(ret); + if (ret > 0) { +
> if (path->slots[0] == 0) + return NULL; +
> path->slots[0]--; + } + + leaf = path->nodes[0]; +
> btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); + + if
> (found_key.objectid != dir || + found_key.type !=
> BTRFS_DIR_ITEM_KEY || + found_key.offset != key.offset) +
> return NULL; + + return btrfs_match_dir_item_name(root, path,
> name, name_len); +} +
> static int __verify_dir_item(struct btrfs_dir_item *item, u32
> start, u32 total) { u16 max_len = BTRFS_NAME_LEN;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index
> df2f6590bb40..af4f30bbd50c 100644 --- a/fs/btrfs/inode.c +++
> b/fs/btrfs/inode.c @@ -161,6 +161,115 @@ int
> __btrfs_readlink(const struct __btrfs_root *root, u64 inr, char
> *target)
> return 0; }
> +static int lookup_root_ref(struct btrfs_fs_info *fs_info, +
> u64 rootid, u64 *root_ret, u64 *dir_ret) +{ + struct btrfs_root
> *root = fs_info->tree_root; + struct btrfs_root_ref *root_ref; +
> struct btrfs_path path; + struct btrfs_key key; + int ret; + +
> btrfs_init_path(&path); + key.objectid = rootid; + key.type =
> BTRFS_ROOT_BACKREF_KEY; + key.offset = (u64)-1; + + ret =
> btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret <
> 0) + return ret; + /* Should not happen */ + if (ret ==
> 0) { + ret = -EUCLEAN; + goto out; + } + ret =
> btrfs_previous_item(root, &path, rootid,
> BTRFS_ROOT_BACKREF_KEY); + if (ret < 0) + goto out; + if
> (ret > 0) { + ret = -ENOENT; + goto out; + } +
> btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); +
> root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0], +
> struct btrfs_root_ref); + *root_ret = key.offset; + *dir_ret =
> btrfs_root_ref_dirid(path.nodes[0], root_ref); +out: +
> btrfs_release_path(&path); + return ret; +} + +/* + * To get
> the parent inode of @ino of @root. + * + * @root_ret and
> @ino_ret will be filled. + * + * NOTE: This function is not
> reliable. It can only get one parent inode. + * The get the
> proper parent inode, we need a full VFS inodes stack to + *
> resolve properly. + */ +static int get_parent_inode(struct
> btrfs_root *root, u64 ino, + struct btrfs_root
> **root_ret, u64 *ino_ret) +{ + struct btrfs_fs_info *fs_info
> = root->fs_info; + struct btrfs_path path; + struct
> btrfs_key key; + int ret; + + if (ino ==
> BTRFS_FIRST_FREE_OBJECTID) { + u64 parent_root; + +
> /* It's top level already, no more parent */ + if
> (root->root_key.objectid == BTRFS_FS_TREE_OBJECTID) { +
> *root_ret = fs_info->fs_root; + *ino_ret =
> BTRFS_FIRST_FREE_OBJECTID; + return 0; + } + +
> ret = lookup_root_ref(fs_info, root->root_key.objectid, +
> &parent_root, ino_ret); + if (ret < 0) + return
> ret; + + key.objectid = parent_root; + key.type =
> BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; +
> *root_ret = btrfs_read_fs_root(fs_info, &key); + if
> (IS_ERR(*root_ret)) + return PTR_ERR(*root_ret); + +
> return 0; + } + + btrfs_init_path(&path); + key.objectid =
> ino; + key.type = BTRFS_INODE_REF_KEY; + key.offset =
> (u64)-1; + + ret = btrfs_search_slot(NULL, root, &key, &path,
> 0, 0); + if (ret < 0) + return ret; + /* Should not
> happen */ + if (ret == 0) { + ret = -EUCLEAN; +
> goto out; + } + ret = btrfs_previous_item(root, &path, ino,
> BTRFS_INODE_REF_KEY); + if (ret < 0) + goto out; + if
> (ret > 0) { + ret = -ENOENT; + goto out; + } +
> btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); +
> *root_ret = root; + *ino_ret = key.offset; +out: +
> btrfs_release_path(&path); + return ret; +} +
> /* inr must be a directory (for regular files with multiple
> hard links this
> function returns only one of the parents of the file) */
> static u64 __get_parent_inode(struct __btrfs_root *root, u64
> inr,
> @@ -235,6 +344,142 @@ static inline const char
> *skip_current_directories(const char *cur)
> return cur; }
> +/* + * Resolve one filename of @ino of @root. + * + * key_ret:
> The child key (either INODE_ITEM or ROOT_ITEM type) + *
> type_ret: BTRFS_FT_* of the child inode. + * + * Return 0 with
> above members filled. + * Return <0 for error. + */ +static
> int resolve_one_filename(struct btrfs_root *root, u64 ino, +
> const char *name, int namelen, + struct btrfs_key
> *key_ret, u8 *type_ret) +{ + struct btrfs_dir_item *dir_item; +
> struct btrfs_path path; + int ret = 0; + +
> btrfs_init_path(&path); + + dir_item =
> btrfs_lookup_dir_item(NULL, root, &path, ino, name, +
> namelen, 0); + if (IS_ERR(dir_item)) { + ret =
> PTR_ERR(dir_item); + goto out; + } + +
> btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret); +
> *type_ret = btrfs_dir_type(path.nodes[0], dir_item); +out: +
> btrfs_release_path(&path); + return ret; +} + +/* + * Resolve a
> full path @filename. The start point is @ino of @root. + * + *
> The result will be filled into @root_ret, @ino_ret and
> @type_ret. + */ +int btrfs_lookup_path(struct btrfs_root *root,
> u64 ino, const char *filename, + struct btrfs_root
> **root_ret, u64 *ino_ret, + u8 *type_ret, int
> symlink_limit) +{ + struct btrfs_fs_info *fs_info =
> root->fs_info; + struct btrfs_root *next_root; + struct
> btrfs_key key; + const char *cur = filename; + u64 next_ino;
> + u8 next_type; + u8 type; + int len; + int ret = 0; + + /*
> If the path is absolute path, also search from fs root */ + if
> (*cur == '/') { + root = fs_info->fs_root; + ino =
> btrfs_root_dirid(&root->root_item); + type = BTRFS_FT_DIR; +
> } + + while (*cur != '\0') { + + cur =
> skip_current_directories(cur); + len = next_length(cur); +
> if (len > BTRFS_NAME_LEN) { + printf("%s: Name too long
> at \"%.*s\"\n", __func__, + BTRFS_NAME_LEN,
> cur); + return -ENAMETOOLONG; + } + if (len ==
> 1 && cur[0] == '.') + break; + /* Go one
> level up */ + if (len == 2 && cur[0] == '.' && cur[1] ==
> '.') { + ret = get_parent_inode(root, ino, &next_root,
> &next_ino); + if (ret < 0) + return ret; +
> root = next_root; + ino = next_ino; + goto
> next; + } + if (!*cur) + break; + +
> ret = resolve_one_filename(root, ino, cur, len, &key, &type); +
> if (ret < 0) + return ret; + /* Child inode is
> a subvolume */ + if (key.type == BTRFS_ROOT_ITEM_KEY) { + +
> next_root = btrfs_read_fs_root(fs_info, &key); + if
> (IS_ERR(next_root)) + return PTR_ERR(next_root); +
> root = next_root; + ino =
> btrfs_root_dirid(&root->root_item); + goto next; +
> } + /* Child inode is a symlink */ + if (type ==
> BTRFS_FT_SYMLINK && symlink_limit >= 0) { + char
> *target; + + if (symlink_limit == 0) { +
> printf("%s: Too much symlinks!\n", __func__); +
> return -EMLINK; + } + target =
> malloc(fs_info->sectorsize); + if (!target) +
> return -ENOMEM; + ret = btrfs_readlink(root, ino,
> target); + if (ret < 0) { +
> free(target); + return ret; + } +
> target[ret] = '\0'; + + ret = btrfs_lookup_path(root,
> ino, target, &next_root, + &next_ino,
> &next_type, + symlink_limit);
Looked through older codes, should be "symlink_limit - 1"?
--
Su
> + if (ret < 0)
> + return ret;
> + root = next_root;
> + ino = next_ino;
> + type = next_type;
> + goto next;
> + }
> + /* Child inode is an inode */
> + ino = key.objectid;
> +next:
> + cur += len;
> + }
> + if (!ret) {
> + *root_ret = root;
> + *ino_ret = ino;
> + *type_ret = type;
> + }
> + return ret;
> +}
> +
> u64 __btrfs_lookup_path(struct __btrfs_root *root, u64 inr, const char *path,
> u8 *type_p, struct btrfs_inode_item *inode_item_p,
> int symlink_limit)
^ permalink raw reply [flat|nested] 85+ messages in thread
* Re: [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
2020-04-22 14:44 ` Su Yue
@ 2020-04-22 14:49 ` Marek Behun
-1 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 14:49 UTC (permalink / raw)
To: Su Yue; +Cc: Qu Wenruo, linux-btrfs, fstests, u-boot
On Wed, 22 Apr 2020 22:44:43 +0800
Su Yue <Damenly_Su@gmx.com> wrote:
> Looked through older codes, should be "symlink_limit - 1"?
OMG yes :) without this it can break :)
^ permalink raw reply [flat|nested] 85+ messages in thread
* [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path()
@ 2020-04-22 14:49 ` Marek Behun
0 siblings, 0 replies; 85+ messages in thread
From: Marek Behun @ 2020-04-22 14:49 UTC (permalink / raw)
To: u-boot
On Wed, 22 Apr 2020 22:44:43 +0800
Su Yue <Damenly_Su@gmx.com> wrote:
> Looked through older codes, should be "symlink_limit - 1"?
OMG yes :) without this it can break :)
^ permalink raw reply [flat|nested] 85+ messages in thread
end of thread, other threads:[~2020-04-22 14:49 UTC | newest]
Thread overview: 85+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-22 6:49 [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 01/26] fs: btrfs: Sync btrfs_btree.h from kernel Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 02/26] fs: btrfs: Add More checksum algorithm support to btrfs Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 03/26] fs: btrfs: Cross-port btrfs_read_dev_super() from btrfs-progs Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 8:26 ` Marek Behun
2020-04-22 8:26 ` Marek Behun
2020-04-22 8:34 ` Qu Wenruo
2020-04-22 8:34 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 04/26] fs: btrfs: Cross-port rbtree-utils " Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 05/26] fs: btrfs: Cross-port extent-cache.[ch] " Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 06/26] fs: btrfs: Cross-port extent-io.[ch] " Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 07/26] fs: btrfs: Cross port structure accessor into ctree.h Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 08/26] fs: btrfs: Cross port volumes.[ch] from btrfs-progs Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 09/26] fs: btrfs: Crossport read_tree_block() " Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 10/26] fs: btrfs: Rename struct btrfs_path to struct __btrfs_path Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 11/26] fs: btrfs: Rename btrfs_root to __btrfs_root Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 12/26] fs: btrfs: Cross port struct btrfs_root to ctree.h Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 13/26] fs: btrfs: Crossport btrfs_search_slot() from btrfs-progs Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 14/26] fs: btrfs: Crossport btrfs_read_sys_array() and btrfs_read_chunk_tree() Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 15/26] fs: btrfs: Crossport open_ctree_fs_info() Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:49 ` [PATCH U-BOOT 16/26] fs: btrfs: Rename path resolve related functions to avoid name conflicts Qu Wenruo
2020-04-22 6:49 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 17/26] fs: btrfs: Use btrfs_readlink() to implement __btrfs_readlink() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 18/26] fs: btrfs: Implement btrfs_lookup_path() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 9:37 ` Su Yue
2020-04-22 9:46 ` Su Yue
2020-04-22 9:46 ` Su Yue
2020-04-22 10:04 ` Marek Behun
2020-04-22 10:04 ` Marek Behun
2020-04-22 14:17 ` Su Yue
2020-04-22 14:17 ` Su Yue
2020-04-22 14:44 ` Su Yue
2020-04-22 14:44 ` Su Yue
2020-04-22 14:49 ` Marek Behun
2020-04-22 14:49 ` Marek Behun
2020-04-22 6:50 ` [PATCH U-BOOT 19/26] fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 20/26] fs: btrfs: Use btrfs_lookup_path() to implement btrfs_exists() and btrfs_size() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 21/26] fs: btrfs: Rename btrfs_file_read() and its callees to avoid name conflicts Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 22/26] fs: btrfs: Introduce btrfs_read_extent_inline() and btrfs_read_extent_reg() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 23/26] fs: btrfs: Introduce lookup_data_extent() for later use Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 24/26] fs: btrfs: Implement btrfs_file_read() Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 25/26] fs: btrfs: Cleanup the old implementation Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 6:50 ` [PATCH U-BOOT 26/26] MAINTAINERS: Add btrfs mail list Qu Wenruo
2020-04-22 6:50 ` Qu Wenruo
2020-04-22 7:46 ` [PATCH U-BOOT 00/26] fs: btrfs: Re-implement btrfs support using the more widely used extent buffer base code Marek Behun
2020-04-22 7:46 ` Marek Behun
2020-04-22 7:52 ` Qu Wenruo
2020-04-22 7:52 ` Qu Wenruo
2020-04-22 7:56 ` Qu Wenruo
2020-04-22 7:56 ` Qu Wenruo
2020-04-22 9:33 ` Marek Behun
2020-04-22 9:33 ` Marek Behun
2020-04-22 7:52 ` Marek Behun
2020-04-22 7:52 ` Marek Behun
2020-04-22 7:59 ` Marek Behun
2020-04-22 7:59 ` Marek Behun
2020-04-22 8:12 ` Qu Wenruo
2020-04-22 8:12 ` Qu Wenruo
2020-04-22 8:13 ` Marek Behun
2020-04-22 8:13 ` Marek Behun
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