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xfs: fix reflink source file racing with directio writes

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While trawling through the dedupe file comparison code trying to fix
page deadlocking problems, Dave Chinner noticed that the reflink code
only takes shared IOLOCK/MMAPLOCKs on the source file.  Because
page_mkwrite and directio writes do not take the EXCL versions of those
locks, this means that reflink can race with writer processes.

For pure remapping this can lead to undefined behavior and file
corruption; for dedupe this means that we cannot be sure that the
contents are identical when we decide to go ahead with the remapping.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2019-08-14 17:38:09 -07:00
parent edc58dd012
commit 5d888b481e
1 changed files with 38 additions and 27 deletions
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65
fs/xfs/xfs_reflink.c
View File

@ -1190,11 +1190,11 @@ xfs_reflink_remap_blocks(
}
/*
* Grab the exclusive iolock for a data copy from src to dest, making
* sure to abide vfs locking order (lowest pointer value goes first) and
* breaking the pnfs layout leases on dest before proceeding. The loop
* is needed because we cannot call the blocking break_layout() with the
* src iolock held, and therefore have to back out both locks.
* Grab the exclusive iolock for a data copy from src to dest, making sure to
* abide vfs locking order (lowest pointer value goes first) and breaking the
* layout leases before proceeding. The loop is needed because we cannot call
* the blocking break_layout() with the iolocks held, and therefore have to
* back out both locks.
*/
static int
xfs_iolock_two_inodes_and_break_layout(
@ -1203,33 +1203,44 @@ xfs_iolock_two_inodes_and_break_layout(
{
int error;
retry:
if (src < dest) {
inode_lock_shared(src);
inode_lock_nested(dest, I_MUTEX_NONDIR2);
} else {
/* src >= dest */
inode_lock(dest);
}
if (src > dest)
swap(src, dest);
error = break_layout(dest, false);
if (error == -EWOULDBLOCK) {
inode_unlock(dest);
if (src < dest)
inode_unlock_shared(src);
retry:
/* Wait to break both inodes' layouts before we start locking. */
error = break_layout(src, true);
if (error)
return error;
if (src != dest) {
error = break_layout(dest, true);
if (error)
return error;
goto retry;
}
/* Lock one inode and make sure nobody got in and leased it. */
inode_lock(src);
error = break_layout(src, false);
if (error) {
inode_unlock(dest);
if (src < dest)
inode_unlock_shared(src);
inode_unlock(src);
if (error == -EWOULDBLOCK)
goto retry;
return error;
}
if (src > dest)
inode_lock_shared_nested(src, I_MUTEX_NONDIR2);
if (src == dest)
return 0;
/* Lock the other inode and make sure nobody got in and leased it. */
inode_lock_nested(dest, I_MUTEX_NONDIR2);
error = break_layout(dest, false);
if (error) {
inode_unlock(src);
inode_unlock(dest);
if (error == -EWOULDBLOCK)
goto retry;
return error;
}
return 0;
}
@ -1247,10 +1258,10 @@ xfs_reflink_remap_unlock(
xfs_iunlock(dest, XFS_MMAPLOCK_EXCL);
if (!same_inode)
xfs_iunlock(src, XFS_MMAPLOCK_SHARED);
xfs_iunlock(src, XFS_MMAPLOCK_EXCL);
inode_unlock(inode_out);
if (!same_inode)
inode_unlock_shared(inode_in);
inode_unlock(inode_in);
}
/*
@ -1325,7 +1336,7 @@ xfs_reflink_remap_prep(
if (same_inode)
xfs_ilock(src, XFS_MMAPLOCK_EXCL);
else
xfs_lock_two_inodes(src, XFS_MMAPLOCK_SHARED, dest,
xfs_lock_two_inodes(src, XFS_MMAPLOCK_EXCL, dest,
XFS_MMAPLOCK_EXCL);
/* Check file eligibility and prepare for block sharing. */