gfs2: gfs2_walk_metadata fix
It turns out that the current version of gfs2_metadata_walker suffers from multiple problems that can cause gfs2_hole_size to report an incorrect size. This will confuse fiemap as well as lseek with the SEEK_DATA flag. Fix that by changing gfs2_hole_walker to compute the metapath to the first data block after the hole (if any), and compute the hole size based on that. Fixes xfstest generic/490. Signed-off-by:Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by:
Bob Peterson <rpeterso@redhat.com> Cc: stable@vger.kernel.org # v4.18+
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