Commit cc6f7771 authored by Darrick J. Wong's avatar Darrick J. Wong

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: default avatarAmir Goldstein <amir73il@gmail.com>
Reviewed-by: default avatarCarlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
parent 2bd6bf03
......@@ -1624,9 +1624,11 @@ 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)) {
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);
}
......
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