ext4_free_blocks_count
EXT4_NUM_B2C(EXT4_SB(sb), ext4_free_blocks_count(es)),
ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);