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xfs: reflink can skip remap existing mappings
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>
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@ -1035,6 +1035,22 @@ xfs_reflink_remap_extent(
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trace_xfs_reflink_remap_extent_dest(ip, &smap);
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/*
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* Two extents mapped to the same physical block must not have
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* different states; that's filesystem corruption. Move on to the next
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* extent if they're both holes or both the same physical extent.
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*/
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if (dmap->br_startblock == smap.br_startblock) {
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if (dmap->br_state != smap.br_state)
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error = -EFSCORRUPTED;
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goto out_cancel;
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}
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/* If both extents are unwritten, leave them alone. */
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if (dmap->br_state == XFS_EXT_UNWRITTEN &&
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smap.br_state == XFS_EXT_UNWRITTEN)
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goto out_cancel;
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/* No reflinking if the AG of the dest mapping is low on space. */
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if (dmap_written) {
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error = xfs_reflink_ag_has_free_space(mp,
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