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gfs2: Generalize truncate code
Pull the code for computing the range of metapointers to iterate out of
gfs2_metapath_ra (for readahead), sweep_bh_for_rgrps (for deallocating
metapointers within a block), and trunc_dealloc (for walking the
metadata tree).
In sweep_bh_for_rgrps, move the code for looking up the resource group
descriptor of the current resource group out of the inner loop. The
metatype check moves to trunc_dealloc.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>