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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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4
fs/xfs/xfs_aops.c
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@ -351,7 +351,7 @@ xfs_map_blocks(
if (imap_valid &&
(!xfs_inode_has_cow_data(ip) ||
wpc->io_type == XFS_IO_COW ||
wpc->cow_seq == ip->i_cowfp->if_seq))
wpc->cow_seq == READ_ONCE(ip->i_cowfp->if_seq)))
return 0;
if (XFS_FORCED_SHUTDOWN(mp))
@ -380,7 +380,7 @@ xfs_map_blocks(
xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &imap))
cow_fsb = imap.br_startoff;
if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
wpc->cow_seq = ip->i_cowfp->if_seq;
wpc->cow_seq = READ_ONCE(ip->i_cowfp->if_seq);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
/*
* Truncate can race with writeback since writeback doesn't