目录
命令连接
显示所有信息：dumpe2fs /dev/mmcblk0
显示超级快信息：dumpe2fs -h /dev/mmcblk0
命令连接
[root@localhost ~]# df <==这个命令可以叫出目前挂载的装置
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hdc2 9920624 3822848 5585708 41% /
/dev/hdc3 4956316 141376 4559108 4% /home
/dev/hdc1 101086 11126 84741 12% /boot
tmpfs 371332 0 371332 0% /dev/shm
[root@localhost ~]# dumpe2fs /dev/hdc2
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name: /1 <==这个是文件系统的名称(Label)
Filesystem features: has_journal ext_attr resize_inode dir_index
filetype needs_recovery sparse_super large_file
Default mount options: user_xattr acl <==默认挂载的参数
Filesystem state: clean <==这个文件系统是没问题的(clean)
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 2560864 <==inode的总数
Block count: 2560359 <==block的总数
Free blocks: 1524760 <==还有多少个 block 可用
Free inodes: 2411225 <==还有多少个 inode 可用
First block: 0
Block size: 4096 <==每个 block 的大小啦！
Filesystem created: Fri Sep 5 01:49:20 2008
Last mount time: Mon Sep 22 12:09:30 2008
Last write time: Mon Sep 22 12:09:30 2008
Last checked: Fri Sep 5 01:49:20 2008
First inode: 11
Inode size: 128 <==每个 inode 的大小
Journal inode: 8 <==底下这三个与下一小节有关
Journal backup: inode blocks
Journal size: 128M
Group 0: (Blocks 0-32767) <==第一个 data group 内容, 包含 block 的启始/结束号码
Primary superblock at 0, Group descriptors at 1-1 <==超级区块在 0 号 block
Reserved GDT blocks at 2-626
Block bitmap at 627 (+627), Inode bitmap at 628 (+628)
Inode table at 629-1641 (+629) <==inode table 所在的 block
0 free blocks, 32405 free inodes, 2 directories <==所有 block 都用完了！
Free blocks:
Free inodes: 12-32416 <==剩余未使用的 inode 号码
Group 1: (Blocks 32768-65535)
#由于数据量非常的庞大，这里省略了一部分输出信息
显示所有信息：dumpe2fs /dev/mmcblk0
[root@szclou mmc0]$dumpe2fs /dev/mmcblk0
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem volume name: <none>
Last mounted on: /hdd
Filesystem UUID: 6b80a6fa-eb0d-4f8a-933c-c4fc716bfda7
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: unsigned_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 1908736
Block count: 7634944
Reserved block count: 381747
Free blocks: 7364702
Free inodes: 1908443
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: Mon Dec 14 16:49:59 2015
Last mount time: Wed Jan 4 01:01:11 2023
Last write time: Wed Jan 4 01:01:11 2023
Mount count: 22
Maximum mount count: -1
Last checked: Mon Dec 14 16:49:59 2015
Check interval: 0 (<none>)
Lifetime writes: 13 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
Default directory hash: half_md4
Directory Hash Seed: ee809704-8f43-41e7-b321-ca250ecac01f
Journal backup: inode blocks
Journal features: journal_incompat_revoke
Journal size: 128M
Journal length: 32768
Journal sequence: 0x00039a15
Journal start: 8262
Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
Checksum 0x09d5, unused inodes 8179
Primary superblock at 0, Group descriptors at 1-2
Reserved GDT blocks at 3-1024
Block bitmap at 1025 (+1025), Inode bitmap at 1041 (+1041)
Inode table at 1057-1568 (+1057)
23513 free blocks, 8179 free inodes, 2 directories, 8179 unused inodes
Free blocks: 9255-32767
Free inodes: 14-8192
Group 1: (Blocks 32768-65535) [INODE_UNINIT, ITABLE_ZEROED]
Checksum 0x2e68, unused inodes 8192
Backup superblock at 32768, Group descriptors at 32769-32770
Reserved GDT blocks at 32771-33792
Block bitmap at 1026 (bg #0 + 1026), Inode bitmap at 1042 (bg #0 + 1042)
Inode table at 1569-2080 (bg #0 + 1569)
1553 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
Free blocks: 33793-33807, 34132-34175, 42547-42623, 42638-42751, 44282-44287, 44430-44543, 44686-44799, 44942-45055, 45198-45311, 58267-58367, 58510-58623, 58766-59391
Free inodes: 8193-16384
Group 2: (Blocks 65536-98303) [INODE_UNINIT, ITABLE_ZEROED]
Checksum 0xbe7a, unused inodes 8192
Block bitmap at 1027 (bg #0 + 1027), Inode bitmap at 1043 (bg #0 + 1043)
Inode table at 2081-2592 (bg #0 + 2081)
6352 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
Free blocks: 67584-68095, 68282-69631, 93814-98303
Free inodes: 16385-24576
Group 3: (Blocks 98304-131071) [INODE_UNINIT, ITABLE_ZEROED]
Checksum 0x0d52, unused inodes 8192
Backup superblock at 98304, Group descriptors at 98305-98306
Reserved GDT blocks at 98307-99328
Block bitmap at 1028 (bg #0 + 1028), Inode bitmap at 1044 (bg #0 + 1044)
Inode table at 2593-3104 (bg #0 + 2593)
31743 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
Free blocks: 99329-131071
Free inodes: 24577-32768
Group 4: (Blocks 131072-163839) [INODE_UNINIT, BLOCK_UNINIT, ITABLE_ZEROED]
Checksum 0x2506, unused inodes 8192
Block bitmap at 1029 (bg #0 + 1029), Inode bitmap at 1045 (bg #0 + 1045)
Inode table at 3105-3616 (bg #0 + 3105)
32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
Free blocks: 131072-163839
Free inodes: 32769-40960
显示超级快信息：dumpe2fs -h /dev/mmcblk0
[root@szclou mmc0]$dumpe2fs -h /dev/mmcblk0
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem volume name: <none>
Last mounted on: /hdd
Filesystem UUID: 6b80a6fa-eb0d-4f8a-933c-c4fc716bfda7
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: unsigned_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 1908736
Block count: 7634944
Reserved block count: 381747
Free blocks: 7364702
Free inodes: 1908443
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: Mon Dec 14 16:49:59 2015
Last mount time: Wed Jan 4 01:01:11 2023
Last write time: Wed Jan 4 01:01:11 2023
Mount count: 22
Maximum mount count: -1
Last checked: Mon Dec 14 16:49:59 2015
Check interval: 0 (<none>)
Lifetime writes: 13 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
Default directory hash: half_md4
Directory Hash Seed: ee809704-8f43-41e7-b321-ca250ecac01f
Journal backup: inode blocks
Journal features: journal_incompat_revoke
Journal size: 128M
Journal length: 32768
Journal sequence: 0x00039a15
Journal start: 8262
