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xfs: use WRITE_ONCE to update if_seq

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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>
This commit is contained in:
Christoph Hellwig
2018-08-07 10:57:12 -07:00
committed by Darrick J. Wong
parent a0e336ba3e
commit 2ba090d521
3 changed files with 21 additions and 6 deletions
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3
fs/xfs/xfs_iomap.c
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@@ -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);
}