linux自动挂载文件修复工具,Linux FSCK自动修复文件系统

背景：

Linux系统(Ubuntu)在运行时，断电等非正常关机操作，会导致ext4文件系统数据损坏。严重时会导致系统崩溃。如下log就是系统数据损坏。

[ 7.878756] EXT4-fs error (device mmcblk0p2): ext4_mb_generate_buddy:742: group 0, 14845 clusters in bitmap, 14822 in gd

[ 8.484660] init: samba-ad-dc main process (995) terminated with status 1

[ 14.248075] EXT4-fs error (device mmcblk0p2): ext4_mb_generate_buddy:742: group 1, 1 clusters in bitmap, 2 in gd

检查方法：

1、开机log，如上log就是开机时，kernel监测到文件系统错误；

2、比如要检查的分区是/dev/mmcblk0p2，如下红色字体部分就是系统错误的信息。

~# tune2fs -l /dev/mmcblk0p2

tune2fs 1.42.9 (4-Feb-2014)

Filesystem volume name:

Last mounted on: /

Filesystem UUID: ab013911-6048-465f-8a1a-cf1420c7bb01

Filesystem magic number: 0xEF53

Filesystem revision #: 1 (dynamic)

Filesystem features: ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

Filesystem flags: unsigned_directory_hash

Default mount options: user_xattr acl

Filesystem state: not clean with errors

Errors behavior: Continue

Filesystem OS type: Linux

Inode count: 393216

Block count: 1572864

Reserved block count: 78643

Free blocks: 289870

Free inodes: 169990

First block: 0

Block size: 4096

Fragment size: 4096

Reserved GDT blocks: 383

Blocks per grou