使用dumpe2fs命令可以读取文件系统superblock的内容

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#文件系统 #linux

本文通过使用dumpe2fs命令展示了如何读取文件系统的superblock信息，包括文件系统特征、状态、块计数等关键数据。

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使用dumpe2fs命令可以读取文件系统superblock的内容：


    [root@zzy402 ~]# dumpe2fs -h /dev/sda1
    dumpe2fs 1.41.12 (17-May-2010)
    Filesystem volume name: <none>
    Last mounted on: /
    Filesystem UUID: 06081aff-f1a8-40c0-9cae-3f1f96461466
    Filesystem magic number: 0xEF53
    Filesystem revision #: 1 (dynamic)
    Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
    Filesystem flags: signed_directory_hash
    Default mount options: user_xattr acl
    Filesystem state: clean
    Errors behavior: Continue
    Filesystem OS type: Linux
    Inode count: 1212416
    Block count: 4849408
    Reserved block count: 242470
    Free blocks: 3673319
    Free inodes: 1094722
    First block: 0
    Block size: 4096
    Fragment size: 4096
    Reserved GDT blocks: 1022
    Blocks per group: 32768
    Fragments per group: 32768
    Inodes per group: 8192
    Inode blocks per group: 512
    Flex block group size: 16
    Filesystem created: Thu Aug 14 00:47:49 2014
    Last mount time: Fri Dec 5 13:13:34 2014
    Last write time: Thu Aug 28 09:10:14 2014
    Mount count: 40
    Maximum mount count: -1
    Last checked: Thu Aug 14 00:47:49 2014
    Check interval: 0 (<none>)
    Lifetime writes: 17 GB
    Reserved blocks uid: 0 (user root)
    Reserved blocks gid: 0 (group root)
    First inode: 11
    Inode size:     256
    Required extra isize: 28
    Desired extra isize: 28
    Journal inode: 8
    First orphan inode: 393554
    Default directory hash: half_md4
    Directory Hash Seed: 7891ce97-7a55-400d-b9de-8779b74a65e6
    Journal backup: inode blocks
    Journal features: journal_incompat_revoke
    Journal size: 128M
    Journal length: 32768
    Journal sequence: 0x0001819f
    Journal start: 1