diff options
| author |   Darrick J. Wong <darrick.wong@oracle.com> | 2017-09-18 09:41:16 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-09-25 18:22:30 -0700 |
| commit | cc6f77710a6de6210f9feda7cd53e2f5ee7a7e69 (patch) | |
| tree | a312cbbabafd119183b5105baf9d4829e6056046 /fs | |
| parent | Linux 4.14-rc1 (diff) | |
| download | linux-dev-cc6f77710a6de6210f9feda7cd53e2f5ee7a7e69.tar.xz linux-dev-cc6f77710a6de6210f9feda7cd53e2f5ee7a7e69.zip | |
xfs: don't unconditionally clear the reflink flag on zero-block files
If we have speculative cow preallocations hanging around in the cow
fork, don't let a truncate operation clear the reflink flag because if
we do then there's a chance we'll forget to free those extents when we
destroy the incore inode.
Reported-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/xfs_inode.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 5599dda4727a..4ec5b7f45401 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -1624,10 +1624,12 @@ xfs_itruncate_extents( goto out; /* - * Clear the reflink flag if we truncated everything. + * Clear the reflink flag if there are no data fork blocks and + * there are no extents staged in the cow fork. */ - if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) { - ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; + if (xfs_is_reflink_inode(ip) && ip->i_cnextents == 0) { + if (ip->i_d.di_nblocks == 0) + ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; xfs_inode_clear_cowblocks_tag(ip); } |