From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: sandeen@redhat.com, linux-nfs@vger.kernel.org,
linux-cifs@vger.kernel.org, Amir Goldstein <amir73il@gmail.com>,
linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-mm@kvack.org, linux-btrfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, ocfs2-devel@oss.oracle.com
Subject: [PATCH 16/25] vfs: make remapping to source file eof more explicit
Date: Wed, 10 Oct 2018 21:14:19 -0700 [thread overview]
Message-ID: <153923125910.5546.5091507666171734847.stgit@magnolia> (raw)
In-Reply-To: <153923113649.5546.9840926895953408273.stgit@magnolia>
From: Darrick J. Wong <darrick.wong@oracle.com>
Create a RFR_TO_SRC_EOF flag to explicitly declare that the caller wants
the remap implementation to remap to the end of the source file, once
the files are locked.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
---
fs/ioctl.c | 3 ++-
fs/nfsd/vfs.c | 4 +++-
fs/read_write.c | 13 ++++++++-----
include/linux/fs.h | 8 +++++++-
4 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 505275ec5596..088cf240ca10 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -224,6 +224,7 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
{
struct fd src_file = fdget(srcfd);
loff_t cloned;
+ unsigned int remap_flags = olen == 0 ? RFR_TO_SRC_EOF : 0;
int ret;
if (!src_file.file)
@@ -232,7 +233,7 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
goto fdput;
cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
- olen, 0);
+ olen, remap_flags);
if (cloned < 0)
ret = cloned;
else if (olen && cloned != olen)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 726fc5b2b27a..0dc65047df1a 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -542,8 +542,10 @@ __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
u64 dst_pos, u64 count)
{
loff_t cloned;
+ unsigned int remap_flags = count == 0 ? RFR_TO_SRC_EOF : 0;
- cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0);
+ cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count,
+ remap_flags);
if (count && cloned != count)
cloned = -EINVAL;
return nfserrno(cloned < 0 ? cloned : 0);
diff --git a/fs/read_write.c b/fs/read_write.c
index a360274b0cdc..6ec908f9a69b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1746,15 +1746,18 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
return -EINVAL;
- /* Zero length dedupe exits immediately; reflink goes to EOF. */
- if (*len == 0) {
+ /*
+ * If the caller asked to go all the way to the end of the source file,
+ * set *len now that we have the file locked.
+ */
+ if (remap_flags & RFR_TO_SRC_EOF) {
loff_t isize = i_size_read(inode_in);
- if (is_dedupe || pos_in == isize)
- return 0;
if (pos_in > isize)
return -EINVAL;
*len = isize - pos_in;
+ if (*len == 0)
+ return 0;
}
/* Check that we don't violate system file offset limits. */
@@ -1849,7 +1852,7 @@ loff_t do_clone_file_range(struct file *file_in, loff_t pos_in,
struct inode *inode_out = file_inode(file_out);
loff_t ret;
- WARN_ON_ONCE(remap_flags);
+ WARN_ON_ONCE(remap_flags & ~(RFR_TO_SRC_EOF));
if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
return -EISDIR;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index d77b8d90d65e..b9c314f9d5a4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1725,10 +1725,15 @@ struct block_device_operations;
* These flags control the behavior of the remap_file_range function pointer.
*
* RFR_SAME_DATA: only remap if contents identical (i.e. deduplicate)
+ * RFR_TO_SRC_EOF: remap to the end of the source file
*/
#define RFR_SAME_DATA (1 << 0)
+#define RFR_TO_SRC_EOF (1 << 1)
-#define RFR_VALID_FLAGS (RFR_SAME_DATA)
+#define RFR_VALID_FLAGS (RFR_SAME_DATA | RFR_TO_SRC_EOF)
+
+/* Implemented by the VFS, so these are advisory. */
+#define RFR_VFS_FLAGS (RFR_TO_SRC_EOF)
/*
* Filesystem remapping implementations should call this helper on their
@@ -1739,6 +1744,7 @@ struct block_device_operations;
static inline bool remap_check_flags(unsigned int remap_flags,
unsigned int supported_flags)
{
+ remap_flags &= ~RFR_VFS_FLAGS;
return (remap_flags & ~(supported_flags & RFR_VALID_FLAGS)) == 0;
}
next prev parent reply other threads:[~2018-10-11 4:14 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-11 4:12 [PATCH v3 00/25] fs: fixes for serious clone/dedupe problems Darrick J. Wong
2018-10-11 4:12 ` [PATCH 01/25] xfs: add a per-xfs trace_printk macro Darrick J. Wong
2018-10-11 13:39 ` Christoph Hellwig
2018-10-11 23:34 ` Darrick J. Wong
2018-10-11 4:12 ` [PATCH 02/25] vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF Darrick J. Wong
2018-10-11 13:40 ` Christoph Hellwig
2018-10-11 4:12 ` [PATCH 03/25] vfs: check file ranges before cloning files Darrick J. Wong
2018-10-11 13:42 ` Christoph Hellwig
2018-10-11 14:13 ` Amir Goldstein
2018-10-11 4:12 ` [PATCH 04/25] vfs: strengthen checking of file range inputs to generic_remap_checks Darrick J. Wong
2018-10-11 13:43 ` Christoph Hellwig
2018-10-11 4:12 ` [PATCH 05/25] vfs: avoid problematic remapping requests into partial EOF block Darrick J. Wong
2018-10-12 0:16 ` Dave Chinner
2018-10-12 16:07 ` Darrick J. Wong
2018-10-12 20:22 ` Filipe Manana
2018-10-15 0:31 ` Dave Chinner
2018-11-02 12:04 ` Filipe Manana
2018-11-02 17:42 ` Darrick J. Wong
2018-11-02 18:18 ` Filipe Manana
2018-11-02 19:05 ` Filipe Manana
2018-10-11 4:13 ` [PATCH 06/25] vfs: skip zero-length dedupe requests Darrick J. Wong
2018-10-11 4:13 ` [PATCH 07/25] vfs: combine the clone and dedupe into a single remap_file_range Darrick J. Wong
2018-10-11 4:13 ` [PATCH 08/25] vfs: rename vfs_clone_file_prep to be more descriptive Darrick J. Wong
2018-10-11 4:13 ` [PATCH 09/25] vfs: rename clone_verify_area to remap_verify_area Darrick J. Wong
2018-10-11 4:13 ` [PATCH 10/25] vfs: create generic_remap_file_range_touch to update inode metadata Darrick J. Wong
2018-10-11 4:13 ` [PATCH 11/25] vfs: pass remap flags to generic_remap_file_range_prep Darrick J. Wong
2018-10-11 4:13 ` [PATCH 12/25] vfs: pass remap flags to generic_remap_checks Darrick J. Wong
2018-10-11 4:13 ` [PATCH 13/25] vfs: make remap_file_range functions take and return bytes completed Darrick J. Wong
2018-10-11 4:14 ` [PATCH 14/25] vfs: plumb RFR_* remap flags through the vfs clone functions Darrick J. Wong
2018-10-11 4:14 ` [PATCH 15/25] vfs: plumb RFR_* remap flags through the vfs dedupe functions Darrick J. Wong
2018-10-11 4:14 ` Darrick J. Wong [this message]
2018-10-11 4:14 ` [PATCH 17/25] vfs: enable remap callers that can handle short operations Darrick J. Wong
2018-10-11 5:15 ` Amir Goldstein
2018-10-11 16:04 ` Darrick J. Wong
2018-10-11 16:05 ` [PATCH v2 " Darrick J. Wong
2018-10-11 4:14 ` [PATCH 18/25] vfs: hide file range comparison function Darrick J. Wong
2018-10-11 4:14 ` [PATCH 19/25] vfs: implement opportunistic short dedupe Darrick J. Wong
2018-10-11 4:14 ` [PATCH 20/25] ocfs2: truncate page cache for clone destination file before remapping Darrick J. Wong
2018-10-11 4:14 ` [PATCH 21/25] ocfs2: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-11 4:15 ` [PATCH 22/25] ocfs2: support partial clone range and dedupe range Darrick J. Wong
2018-10-11 4:15 ` [PATCH 23/25] xfs: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-12 1:15 ` Dave Chinner
2018-10-11 4:15 ` [PATCH 24/25] xfs: support returning partial reflink results Darrick J. Wong
2018-10-12 1:22 ` Dave Chinner
2018-10-12 16:06 ` Darrick J. Wong
2018-10-11 4:15 ` [PATCH 25/25] xfs: remove redundant remap partial EOF block checks Darrick J. Wong
2018-10-12 1:22 ` Dave Chinner
2018-10-11 8:33 ` [PATCH v3 00/25] fs: fixes for serious clone/dedupe problems Amir Goldstein
2018-10-11 15:55 ` Darrick J. Wong
2018-10-13 0:05 [PATCH v4 " Darrick J. Wong
2018-10-13 0:07 ` [PATCH 16/25] vfs: make remapping to source file eof more explicit Darrick J. Wong
2018-10-14 17:24 ` Christoph Hellwig
2018-10-15 15:32 ` Darrick J. Wong
2018-10-15 18:28 ` Christoph Hellwig
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