使用man 命令可以查看 dumpe2fs 命令具体的使用的方法：

NAME
       dumpe2fs - dump ext2/ext3/ext4 filesystem information

SYNOPSIS
       dumpe2fs [ -bfghixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device

DESCRIPTION
       dumpe2fs prints the super block and blocks group information for the filesystem present on device.

       Note: When used with a mounted filesystem, the printed information may be old or inconsistent.

使用方法：

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查看磁盘inode和block信息：

[root@docker ~]# ls /dev/sd*
/dev/sda  /dev/sda1  /dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdc  /dev/sdc1  /dev/sdd  /dev/sdd1  /dev/sde  /dev/sde1
[root@docker ~]# dumpe2fs /dev/sdb1 |grep "Block count"
dumpe2fs 1.44.3 (10-July-2018)
Block count:              262144
[root@docker ~]# dumpe2fs /dev/sdb1 |grep "Inode count"
dumpe2fs 1.44.3 (10-July-2018)
Inode count:              65536

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