mkfs.ext4 测试过的block size为1024,2048,4096,8192,16384,32768,65536,当升到131072(128KB)的时候, 就报 ` mkfs.ext4 -b 131072 /dev/sdbmkfs.ext4: invalid block size - 131072 \`

```

mkfs.ext4 -b 512 /dev/sdb

mkfs.ext4: invalid block size - 512

```