Hi, My question is, Is there a way to calculate how much space metadata has occupied? So the case I've run into is that 'df /mnt' shows Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdc 882019232 26517428 811356348 4% /mnt but 'du -s /mnt' shows 13347132 /mnt And this is a freshly mounted ext4, so no deleted files or dirty data exist. The kernel is quite old (2.6.32), but I was just wondering, could it be due to metadata using about 13G given the whole filesystem is 842G? I think it has nothing to do with "Reserved block counts" as df calculates "Used" in ext4_statfs() by "buf->f_blocks - buf->f_bfree". So if there is a way to know the usage of metadata space, via either manual analysis from the output of dumpe2fs/debugfs or a tool, could you please suggest? thanks, liubo
