nilfs_sufile_segment_usages_per_block
t = div64_ul(t, nilfs_sufile_segment_usages_per_block(sufile));
return do_div(t, nilfs_sufile_segment_usages_per_block(sufile));
nilfs_sufile_segment_usages_per_block(sufile) -
segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);
segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile);