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authorDarrick J. Wong <darrick.wong@oracle.com>2017-09-18 09:41:16 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-27 10:38:08 +0200
commit4e9de11c237724140c0ae14ead598c7fbc2847bd (patch)
tree166006019535bd6fb3e00a403adbb1db0ce8907d /fs/xfs
parent13c5e97701091f9b02ded0c68809f8a6b08c747a (diff)
xfs: don't unconditionally clear the reflink flag on zero-block files
commit cc6f77710a6de6210f9feda7cd53e2f5ee7a7e69 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_inode.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 9e795ab08a53..fe9a9a183b2d 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1632,10 +1632,12 @@ 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);
}