btrfs: allow backref search checks for shared extents
When called with a struct share_check, find_parent_nodes() will detect a shared extent and immediately return with BACKREF_SHARED_FOUND. Signed-off-by:Edmund Nadolski <enadolski@suse.com> Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Reviewed-by:
Liu Bo <bo.li.liu@oracle.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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9dd14fd6
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