From: Boris Burkov <boris@bur.io>
To: linux-btrfs@vger.kernel.org, linux-fscrypt@vger.kernel.org,
kernel-team@fb.com
Subject: [PATCH v4 1/5] btrfs: add compat_flags to btrfs_inode_item
Date: Wed, 5 May 2021 12:20:39 -0700 [thread overview]
Message-ID: <6ed83a27f88e18f295f7d661e9c87e7ec7d33428.1620241221.git.boris@bur.io> (raw)
In-Reply-To: <cover.1620241221.git.boris@bur.io>
The tree checker currently rejects unrecognized flags when it reads
btrfs_inode_item. Practically, this means that adding a new flag makes
the change backwards incompatible if the flag is ever set on a file.
Take up one of the 4 reserved u64 fields in the btrfs_inode_item as a
new "compat_flags". These flags are zero on inode creation in btrfs and
mkfs and are ignored by an older kernel, so it should be safe to use
them in this way.
Signed-off-by: Boris Burkov <boris@bur.io>
---
fs/btrfs/btrfs_inode.h | 1 +
fs/btrfs/ctree.h | 2 ++
fs/btrfs/delayed-inode.c | 2 ++
fs/btrfs/inode.c | 3 +++
fs/btrfs/ioctl.c | 7 ++++---
fs/btrfs/tree-log.c | 1 +
include/uapi/linux/btrfs_tree.h | 7 ++++++-
7 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index c652e19ad74e..e8dbc8e848ce 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -191,6 +191,7 @@ struct btrfs_inode {
/* flags field from the on disk inode */
u32 flags;
+ u64 compat_flags;
/*
* Counters to keep track of the number of extent item's we may use due
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0f5b0b12762b..0546273a520b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1786,6 +1786,7 @@ 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_FUNCS(inode_compat_flags, struct btrfs_inode_item, compat_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,
@@ -1803,6 +1804,7 @@ 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);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_compat_flags, struct btrfs_inode_item, compat_flags, 64);
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);
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 1a88f6214ebc..ef4e0265dbe3 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1718,6 +1718,7 @@ static void fill_stack_inode_item(struct btrfs_trans_handle *trans,
btrfs_set_stack_inode_transid(inode_item, trans->transid);
btrfs_set_stack_inode_rdev(inode_item, inode->i_rdev);
btrfs_set_stack_inode_flags(inode_item, BTRFS_I(inode)->flags);
+ btrfs_set_stack_inode_compat_flags(inode_item, BTRFS_I(inode)->compat_flags);
btrfs_set_stack_inode_block_group(inode_item, 0);
btrfs_set_stack_timespec_sec(&inode_item->atime,
@@ -1776,6 +1777,7 @@ int btrfs_fill_inode(struct inode *inode, u32 *rdev)
inode->i_rdev = 0;
*rdev = btrfs_stack_inode_rdev(inode_item);
BTRFS_I(inode)->flags = btrfs_stack_inode_flags(inode_item);
+ BTRFS_I(inode)->compat_flags = btrfs_stack_inode_compat_flags(inode_item);
inode->i_atime.tv_sec = btrfs_stack_timespec_sec(&inode_item->atime);
inode->i_atime.tv_nsec = btrfs_stack_timespec_nsec(&inode_item->atime);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 69fcdf8f0b1c..d89000577f7f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3627,6 +3627,7 @@ static int btrfs_read_locked_inode(struct inode *inode,
BTRFS_I(inode)->index_cnt = (u64)-1;
BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
+ BTRFS_I(inode)->compat_flags = btrfs_inode_compat_flags(leaf, inode_item);
cache_index:
/*
@@ -3793,6 +3794,7 @@ static void fill_inode_item(struct btrfs_trans_handle *trans,
btrfs_set_token_inode_transid(&token, item, trans->transid);
btrfs_set_token_inode_rdev(&token, item, inode->i_rdev);
btrfs_set_token_inode_flags(&token, item, BTRFS_I(inode)->flags);
+ btrfs_set_token_inode_compat_flags(&token, item, BTRFS_I(inode)->compat_flags);
btrfs_set_token_inode_block_group(&token, item, 0);
}
@@ -8857,6 +8859,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
ei->defrag_bytes = 0;
ei->disk_i_size = 0;
ei->flags = 0;
+ ei->compat_flags = 0;
ei->csum_bytes = 0;
ei->index_cnt = (u64)-1;
ei->dir_index = 0;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0ba0e4ddaf6b..ff335c192170 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -102,8 +102,9 @@ static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
* Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
* ioctl.
*/
-static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
+static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode *binode)
{
+ unsigned int flags = binode->flags;
unsigned int iflags = 0;
if (flags & BTRFS_INODE_SYNC)
@@ -156,7 +157,7 @@ void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
{
struct btrfs_inode *binode = BTRFS_I(file_inode(file));
- unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
+ unsigned int flags = btrfs_inode_flags_to_fsflags(binode);
if (copy_to_user(arg, &flags, sizeof(flags)))
return -EFAULT;
@@ -228,7 +229,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
btrfs_inode_lock(inode, 0);
fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
- old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
+ old_fsflags = btrfs_inode_flags_to_fsflags(binode);
ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
if (ret)
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index a0fc3a1390ab..3ef166a3485a 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3944,6 +3944,7 @@ static void fill_inode_item(struct btrfs_trans_handle *trans,
btrfs_set_token_inode_transid(&token, item, trans->transid);
btrfs_set_token_inode_rdev(&token, item, inode->i_rdev);
btrfs_set_token_inode_flags(&token, item, BTRFS_I(inode)->flags);
+ btrfs_set_token_inode_compat_flags(&token, item, BTRFS_I(inode)->compat_flags);
btrfs_set_token_inode_block_group(&token, item, 0);
}
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index 58d7cff9afb1..ae25280316bd 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -574,11 +574,16 @@ struct btrfs_inode_item {
/* modification sequence number for NFS */
__le64 sequence;
+ /*
+ * flags which aren't checked for corruption at mount
+ * and can be added in a backwards compatible way
+ */
+ __le64 compat_flags;
/*
* a little future expansion, for more than this we can
* just grow the inode item and version it
*/
- __le64 reserved[4];
+ __le64 reserved[3];
struct btrfs_timespec atime;
struct btrfs_timespec ctime;
struct btrfs_timespec mtime;
--
2.30.2
next parent reply other threads:[~2021-05-05 19:20 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1620241221.git.boris@bur.io>
2021-05-05 19:20 ` Boris Burkov [this message]
2021-05-11 19:11 ` [PATCH v4 1/5] btrfs: add compat_flags to btrfs_inode_item David Sterba
2021-05-17 21:48 ` David Sterba
2021-05-19 21:45 ` Boris Burkov
2021-06-07 21:43 ` David Sterba
2021-05-25 18:12 ` Eric Biggers
2021-06-07 21:10 ` David Sterba
2021-05-05 19:20 ` [PATCH v4 2/5] btrfs: initial fsverity support Boris Burkov
2021-05-06 0:09 ` kernel test robot
2021-05-11 19:20 ` David Sterba
2021-05-11 20:31 ` David Sterba
2021-05-11 21:52 ` Boris Burkov
2021-05-12 17:10 ` David Sterba
2021-05-13 19:19 ` Boris Burkov
2021-05-17 21:40 ` David Sterba
2021-05-12 17:34 ` David Sterba
2021-05-05 19:20 ` [PATCH v4 3/5] btrfs: check verity for reads of inline extents and holes Boris Burkov
2021-05-12 17:57 ` David Sterba
2021-05-12 18:25 ` Boris Burkov
2021-05-05 19:20 ` [PATCH v4 4/5] btrfs: fallback to buffered io for verity files Boris Burkov
2021-05-05 19:20 ` [PATCH v4 5/5] btrfs: verity metadata orphan items Boris Burkov
2021-05-12 17:48 ` David Sterba
2021-05-12 18:08 ` Boris Burkov
2021-05-12 23:36 ` David Sterba
2021-05-05 19:20 [PATCH v4 0/5] btrfs: support fsverity Boris Burkov
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