grep してみた。fs/ext3 の中。 $ grep s_free_blocks_count fs/ext3/* fs/ext3/balloc.c: le32_to_cpu(es->s_free_blocks_count), fs/ext3/super.c: sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); fs/ext3/super.c: es->s_free…