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- fix a race between overlapping copy on write aio
 - fix cow fork swapping when we defragment reflinked files
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Merge tag 'xfs-4.14-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:

 - fix a race between overlapping copy on write aio

 - fix cow fork swapping when we defragment reflinked files

* tag 'xfs-4.14-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: handle racy AIO in xfs_reflink_end_cow
  xfs: always swap the cow forks when swapping extents
This commit is contained in:
Linus Torvalds 2017-10-06 15:53:36 -07:00
commit eab26ad197
2 changed files with 30 additions and 3 deletions
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24
fs/xfs/xfs_bmap_util.c
View File

@ -2122,11 +2122,31 @@ xfs_swap_extents(
ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK;
tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK;
}
/* Swap the cow forks. */
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
xfs_extnum_t extnum;
ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS);
ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS);
extnum = ip->i_cnextents;
ip->i_cnextents = tip->i_cnextents;
tip->i_cnextents = extnum;
cowfp = ip->i_cowfp;
ip->i_cowfp = tip->i_cowfp;
tip->i_cowfp = cowfp;
xfs_inode_set_cowblocks_tag(ip);
xfs_inode_set_cowblocks_tag(tip);
if (ip->i_cowfp && ip->i_cnextents)
xfs_inode_set_cowblocks_tag(ip);
else
xfs_inode_clear_cowblocks_tag(ip);
if (tip->i_cowfp && tip->i_cnextents)
xfs_inode_set_cowblocks_tag(tip);
else
xfs_inode_clear_cowblocks_tag(tip);
}
xfs_trans_log_inode(tp, ip, src_log_flags);

9
fs/xfs/xfs_reflink.c
View File

@ -736,7 +736,13 @@ xfs_reflink_end_cow(
/* If there is a hole at end_fsb - 1 go to the previous extent */
if (!xfs_iext_lookup_extent(ip, ifp, end_fsb - 1, &idx, &got) ||
got.br_startoff > end_fsb) {
ASSERT(idx > 0);
/*
* In case of racing, overlapping AIO writes no COW extents
* might be left by the time I/O completes for the loser of
* the race. In that case we are done.
*/
if (idx <= 0)
goto out_cancel;
xfs_iext_get_extent(ifp, --idx, &got);
}
@ -809,6 +815,7 @@ xfs_reflink_end_cow(
out_defer:
xfs_defer_cancel(&dfops);
out_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
out: