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xfs: reflink can skip remap existing mappings

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If the source and destination map are identical, we can skip the remap
step to save some time.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-06-29 14:47:19 -07:00
parent 94b941fd7a
commit 168eae803c
1 changed files with 16 additions and 0 deletions
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16
fs/xfs/xfs_reflink.c
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@ -1035,6 +1035,22 @@ xfs_reflink_remap_extent(
trace_xfs_reflink_remap_extent_dest(ip, &smap);
/*
* Two extents mapped to the same physical block must not have
* different states; that's filesystem corruption. Move on to the next
* extent if they're both holes or both the same physical extent.
*/
if (dmap->br_startblock == smap.br_startblock) {
if (dmap->br_state != smap.br_state)
error = -EFSCORRUPTED;
goto out_cancel;
}
/* If both extents are unwritten, leave them alone. */
if (dmap->br_state == XFS_EXT_UNWRITTEN &&
smap.br_state == XFS_EXT_UNWRITTEN)
goto out_cancel;
/* No reflinking if the AG of the dest mapping is low on space. */
if (dmap_written) {
error = xfs_reflink_ag_has_free_space(mp,