descriptor_loc    993 fs/ext2/super.c 		block = descriptor_loc(sb, logic_sb_block, i);
descriptor_loc   1777 fs/ext3/super.c 		block = descriptor_loc(sb, logic_sb_block, i);
descriptor_loc   2247 fs/ext4/super.c 		block = descriptor_loc(sb, logical_sb_block, i);