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| author | Christoph Hellwig <hch@lst.de> | 2018-08-07 10:57:12 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-08-07 10:57:12 -0700 |
| commit | 2ba090d521c5e09f32316c179d25bb6f699d3568 (patch) | |
| tree | 1171512eca076f1e10fea00dcf8e07766486c1a4 /fs/xfs/xfs_iomap.c | |
| parent | a0e336ba3e3d1c7ec0f738a2e2e203434c00b08e (diff) | |
| download | blackbird-obmc-linux-2ba090d521c5e09f32316c179d25bb6f699d3568.tar.gz blackbird-obmc-linux-2ba090d521c5e09f32316c179d25bb6f699d3568.zip | |
xfs: use WRITE_ONCE to update if_seq
This adds ordering of the updates and makes sure we always see the if_seq
update before the extent tree is modified.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 3282575e2df4..6320aca39f39 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -655,6 +655,7 @@ xfs_iomap_write_allocate( unsigned int *cow_seq) { xfs_mount_t *mp = ip->i_mount; + struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); xfs_fileoff_t offset_fsb, last_block; xfs_fileoff_t end_fsb, map_start_fsb; xfs_filblks_t count_fsb; @@ -768,7 +769,7 @@ xfs_iomap_write_allocate( goto error0; if (whichfork == XFS_COW_FORK) - *cow_seq = XFS_IFORK_PTR(ip, whichfork)->if_seq; + *cow_seq = READ_ONCE(ifp->if_seq); xfs_iunlock(ip, XFS_ILOCK_EXCL); } |
