gfs2: Get rid of gfs2_write_calc_reserv in gfs2_iomap_begin_write Compute the number of blocks to allocate in gfs2_compute_alloc_size. This allows to get rid of gfs2_write_calc_reserv in gfs2_iomap_begin_write. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>