eMMC工具dumpe2fs

[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

[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

[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