Linux inode 之我见

Linux硬盘组织方式为:引导区、超级块(superblock),索引结点(inode),数据块(datablock),目录块(diredtory block).其中超级块中包含了关于该硬盘或分区上的文件系统的整体信息,如文件系统的大小等;超级块后面的数据结构是索引结点,它包含了针对某一个具体文件的几乎全部信息,如文件的存取权限、所有者、大小、建立时间以及对应的目录块和数据块等;数据块是真正存储文件内容的位置.但是索引结点中不包括文件的名字,文件名是放在目录块里的.目录块里包含有文件的名字以及此文件的索引结点编号

硬盘盘片为圆形，每个硬盘盘片都有一个可以读写的磁头(Head)，将这个磁头固定，使硬盘盘片旋转一周，所走轨迹就是磁道(Track)。硬盘内所有盘片的相同磁道号的集合成为磁柱(Cylinder)。每一磁道被划分成许多区域，每个区域叫一个扇区(Sector)硬盘的最小存储单位叫做"扇区"（Sector）。每个扇区储存512字节（相当于0.5KB）。

硬盘的0磁道的第一个扇区称为MBR，它的大小是512字节，而这个区域可以分为两个部分。第一部分为pre-boot区（预启动区），占446字节；第二部分是Partition table区（分区表），占66个字节，该区相当于一个小程序，作用是判断哪个分区被标记为活动分区，然后去读取那个分区的启动区，并运行该区中的代码。不属于任何一个操作系统，也不能用操作系统提供的磁盘操作命令来读取它。但我们可以用ROM-BIOS中提供的INT13H的2号功能来读出该扇区的内容，也可用软件工具Norton8.0中的DISKEDIT.EXE来读取。

操作系统读取硬盘的时候，不会一个个扇区地读取，这样效率太低，而是一次性连续读取多个扇区，即一次性读取一个"块"（block）。这种由多个扇区组成的"块"，是文件存取的最小单位。"块"的大小，最常见的是4KB，即连续八个 sector组成一个 block。block的大小在格式化分区的时候就确定了。

硬盘格式化的时候，操作系统自动将硬盘分成两个区域。一个是数据区，存放文件数据；另一个是inode区（inode table），存放inode所包含的信息。每个inode节点的大小，一般是128字节或256字节。此时， inode 与 block 规划好了，除非重新格式化(或者利用 resize2fs 等命令变更文件系统大小)，否则 inode 与 block 固定后就不再变动。

 关于block

• SuperBlock：如前所述， Superblock 是记录整个 filesystem 相关信息的地方， 没有 Superblock ，就没有这个 filesystem 了。他记录的信息主要有：
　　o block 与 inode 的总量；
　　o 未使用与已使用的 inode / block 数量；
　　o 一个 block 与一个 inode 的大小；
　　o filesystem 的挂载时间、最近一次写入数据的时间、最近一次检验磁盘 (fsck) 的时间等档案系统的相关信息；
　　o 一个 valid bit 数值，若此档案系统已被挂载，则 valid bit 为 0 ，若未被挂载，则 valid bit 为 1 。
• Group Description：纪录此 block 由由何处开始记录；
• Block bitmap：此处记录那个 block 有没有被使用；
• Inode bitmap：此处记录那个 inode 有没有被使用；
• Inode table：为每个 inode 数据存放区；
• Data Blocks：为每个 block 数据存放区。

inode包含文件的元信息，具体来说有以下内容：

　　* 文件的字节数
　　* 文件拥有者的User ID
　　* 文件的Group ID
　　* 文件的读、写、执行权限
　　* 文件的时间戳，共有三个：ctime指inode上一次变动的时间，mtime指文件内容上一次变动的时间，atime指文件上一次打开的时间。
　　* 链接数，即有多少文件名指向这个inode
　　* 文件数据block的位置

eg：

6816307 -rw-r--r-- 1 workherd root 1073741824 Sep 10 11:22 test1126

File: `test1126'
Size: 1073741824 Blocks: 2097160 IO Block: 4096 regular file
Device: 802h/2050d Inode: 6816307 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 502/ workherd) Gid: ( 0/ root)
Access: 2017-09-10 11:22:08.607120512 +0800
Modify: 2017-09-10 11:22:19.665120370 +0800
Change: 2017-09-10 11:28:02.053153370 +0800

inode 要记录的数据非常多，但偏偏又只有 128bytes 而已， 而 inode 记录一个 block 号码要花掉 4byte。 inode 记录 block 号码的区域定义为12个直接，一个间接, 一个双间接与一个三间接记录区。 12 个直接指向 block 号码的对照，这 12 笔记录就能够直接取得 block 号码啦！ 至于所谓的间接就是再拿一个 block 来当作记录 block 号码的记录区，如果文件太大时， 就会使用间接的 block 来记录编号。如果文件持续长大，那么就会利用所谓的双间接，第一个 block 仅再指出下一个记录编号的 block 在哪里， 实际记录的在第二个 block 当中。依此类推，三间接就是利用第三层 block 来记录编号。

inode 本身并不纪录文件名，而是记录档案的相关属性，至于文件名则是记录在目录所属的 block 区域。所以当我们要读取一个档案的内容时，我们的 Linux 会先由根目录 / 取得该档案的上层目录所在 inode ， 再由该目录所记录的档案关连性 (在该目录所属的 block 区域) 取得该档案的 inode ， 最后在经由 inode 内提供的 block 指向，而取得最终的档案内容。读取 /etc/crontab 的流程为：
1. 操作系统根据根目录( / )的相关资料可取得 /etc 这个目录所在的 inode ，并前往读取 /etc 这个目录的所有相关属性；
2. 根据 /etc 的 inode 的资料，可以取得 /etc 这个目录底下所有档案的关连数据是放置在哪一个 Block 当中，并前往该 block 读取档案的关连性内容；
3. 由上个步骤的 Block 当中，可以知道 crontab 这个档案的 inode 所在地，并前往该 inode ；
4. 由上个步骤的 inode 当中，可以取得 crontab 这个档案的所有属性，并且可前往由 inode 所指向的 Block 区域，顺利的取得 crontab 的档案内容。

    Linux通过文件元信息中的Blocks和Size参数就能定位文件在磁盘的位置了

可使用命令dumpe2fs /dev/sda1 查看分析信息

磁盘信息示例

Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          66b58b73-59ce-41ba-af77-5de77824f4bf
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:              8134656
Block count:              32524032
Reserved block count:     1626201
Free blocks:              12767275
Free inodes:              8018290
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1016
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Wed Jun 22 12:44:06 2016
Last mount time:          Sun Aug 13 11:09:02 2017
Last write time:          Wed Jun 22 12:59:33 2016
Mount count:              24
Maximum mount count:      -1
Last checked:             Wed Jun 22 12:44:06 2016
Check interval:           0 (<none>)
Lifetime writes:          752 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:       6291459
Default directory hash:   half_md4
Directory Hash Seed:      fc4e3a8c-8a9a-4445-9475-10a6d880e11d
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Journal size:             128M
Journal length:           32768
Journal sequence:         0x0047b425
Journal start:            12870


Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
  Checksum 0x8cdb, unused inodes 0
 Primary superblock at 0, Group descriptors at 1-8
  Reserved GDT blocks at 9-1024
  Block bitmap at 1025 (+1025), Inode bitmap at 1041 (+1041)
  Inode table at 1057-1568 (+1057)
  14812 free blocks, 8179 free inodes, 2 directories
  Free blocks: 13521, 17957-32767
  Free inodes: 14-8192
Group 1: (Blocks 32768-65535) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x8896, unused inodes 8192
  Backup superblock at 32768, Group descriptors at 32769-32776
  Reserved GDT blocks at 32777-33792
  Block bitmap at 1026 (+4294935554), Inode bitmap at 1042 (+4294935570)
  Inode table at 1569-2080 (+4294936097)
  1414 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 33800-33823, 33874-33919, 33994-33998, 34038-34044, 34046-34047, 34068-34074, 34076-34086, 34108-34110, 34169-34186, 34193-34815, 49276-49279, 49911-49919, 49941-49951, 49971-49983, 50011-50015, 50035-50047, 50215-50271, 50293-50303, 50326-50335, 50356-50367, 50387-50399, 50423-50431, 50453-50463, 50484-50495, 50518-50527, 50546-50559, 50587-50623, 50645-50655, 50677-50943, 51039-51167, 51190-51199
  Free inodes: 8193-16384
Group 2: (Blocks 65536-98303) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x450c, unused inodes 8192
  Block bitmap at 1027 (+4294902787), Inode bitmap at 1043 (+4294902803)
  Inode table at 2081-2592 (+4294903841)
  4235 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 66814, 66816-67087, 67107-67149, 67502-67583, 77824-78431, 78452-78463, 78486-78495, 78517-78527, 78550-78559, 78586-78847, 78866-78975, 78997-79017, 79115-79871, 81920-83807, 83830-83967, 83974, 83987-83995
  Free inodes: 16385-24576
Group 3: (Blocks 98304-131071) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x90df, unused inodes 8192
  Backup superblock at 98304, Group descriptors at 98305-98312
  Reserved GDT blocks at 98313-99328
  Block bitmap at 1028 (+4294870020), Inode bitmap at 1044 (+4294870036)
  Inode table at 2593-3104 (+4294871585)
  1996 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 99343-99359, 99433-99451, 99461-99583, 99918-100351, 110225-110245, 110250-110271, 110329-110591, 114688-115548, 116500-116735
  Free inodes: 24577-32768
Group 4: (Blocks 131072-163839) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x33a6, unused inodes 8192
  Block bitmap at 1029 (+4294837253), Inode bitmap at 1045 (+4294837269)
  Inode table at 3105-3616 (+4294839329)
  2706 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 135516-135581, 135608-135807, 136326-136384, 136390-137087, 147456-148004, 148079-148223, 148301-148479, 148609, 148696-149503, 152107
  Free inodes: 32769-40960
Group 5: (Blocks 163840-196607) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb3de, unused inodes 8192
  Backup superblock at 163840, Group descriptors at 163841-163848
  Reserved GDT blocks at 163849-164864
  Block bitmap at 1030 (+4294804486), Inode bitmap at 1046 (+4294804502)
  Inode table at 3617-4128 (+4294807073)
  5050 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 166436-166463, 166466-166495, 166518-166527, 166586-166835, 166899-167935, 172618-172621, 172623-172991, 173014-173055, 173568-174079, 178085-178175, 180923-181247, 181281-182271, 182959-184319
  Free inodes: 40961-49152
Group 6: (Blocks 196608-229375) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x7131, unused inodes 8192
  Block bitmap at 1031 (+4294771719), Inode bitmap at 1047 (+4294771735)
  Inode table at 4129-4640 (+4294774817)
2045 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 199489-200703, 204704-204799, 208673-208895, 216795-217087, 220966-221183
  Free inodes: 49153-57344
Group 7: (Blocks 229376-262143) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x139f, unused inodes 8192
  Backup superblock at 229376, Group descriptors at 229377-229384
  Reserved GDT blocks at 229385-230400
  Block bitmap at 1032 (+4294738952), Inode bitmap at 1048 (+4294738968)
  Inode table at 4641-5152 (+4294742561)
  2743 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 236240-236255, 241286-241663, 247734-247807, 255773-255999, 260096-262143
  Free inodes: 57345-65536
Group 8: (Blocks 262144-294911) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x0705, unused inodes 8192
  Block bitmap at 1033 (+4294706185), Inode bitmap at 1049 (+4294706201)
  Inode table at 5153-5664 (+4294710305)
  15585 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 262144-264360, 265651-271357, 271812-272383, 277583-284671
  Free inodes: 65537-73728
Group 9: (Blocks 294912-327679) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x7e07, unused inodes 8192
  Backup superblock at 294912, Group descriptors at 294913-294920
  Reserved GDT blocks at 294921-295936
  Block bitmap at 1034 (+4294673418), Inode bitmap at 1050 (+4294673434)
  Inode table at 5665-6176 (+4294678049)
  24291 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 295937-296575, 296594-296959, 304394-327679
  Free inodes: 73729-81920
Group 10: (Blocks 327680-360447) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x488e, unused inodes 8192
  Block bitmap at 1035 (+4294640651), Inode bitmap at 1051 (+4294640667)
  Inode table at 6177-6688 (+4294645793)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 81921-90112
Group 11: (Blocks 360448-393215) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd5a7, unused inodes 8192
  Block bitmap at 1036 (+4294607884), Inode bitmap at 1052 (+4294607900)
  Inode table at 6689-7200 (+4294613537)
  429 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 362136-362143, 362188-362191, 362200-362207, 362400-362431, 362456-362463, 362480-362495, 372860-372863, 380939-380943, 380968-380975, 380984-380991, 381928-381935, 381944-381951, 382552-382559, 382568-382575, 382584-382591, 382596-382655, 382728-382847, 382860-382911, 382920-382975
  Free inodes: 90113-98304
Group 12: (Blocks 393216-425983) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbd33, unused inodes 8192
  Block bitmap at 1037 (+4294575117), Inode bitmap at 1053 (+4294575133)
  Inode table at 7201-7712 (+4294581281)
  731 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 394533-395263
  Free inodes: 98305-106496
Group 13: (Blocks 425984-458751) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xf752, unused inodes 8192
  Block bitmap at 1038 (+4294542350), Inode bitmap at 1054 (+4294542366)
 Inode table at 7713-8224 (+4294549025)
  15347 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 438011-438120, 438122-438271, 442368-442431, 442449-442607, 442616-442692, 442695-442847, 442888-443007, 443103-443647, 443663-444735, 444752-445439, 446464-446815, 446824-448271, 448280-450063, 450128-458751
  Free inodes: 106497-114688
Group 14: (Blocks 458752-491519) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x50b0, unused inodes 8192
  Block bitmap at 1039 (+4294509583), Inode bitmap at 1055 (+4294509599)
  Inode table at 8225-8736 (+4294516769)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 458752-491519
  Free inodes: 114689-122880
Group 15: (Blocks 491520-524287) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xef1f, unused inodes 8192
  Block bitmap at 1040 (+4294476816), Inode bitmap at 1056 (+4294476832)
  Inode table at 8737-9248 (+4294484513)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 491520-524287
  Free inodes: 122881-131072
Group 16: (Blocks 524288-557055) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa577, unused inodes 8192
  Block bitmap at 524288 (+0), Inode bitmap at 524304 (+16)
  Inode table at 524320-524831 (+32)
  24544 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 532512-557055
  Free inodes: 131073-139264
Group 17: (Blocks 557056-589823) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xf9f3, unused inodes 8192
  Block bitmap at 524289 (+4294934529), Inode bitmap at 524305 (+4294934545)
  Inode table at 524832-525343 (+4294935072)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 557056-589823
  Free inodes: 139265-147456
Group 18: (Blocks 589824-622591) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x589d, unused inodes 8192
  Block bitmap at 524290 (+4294901762), Inode bitmap at 524306 (+4294901778)
  Inode table at 525344-525855 (+4294902816)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 589824-622591
  Free inodes: 147457-155648
Group 19: (Blocks 622592-655359) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xf846, unused inodes 8192
  Block bitmap at 524291 (+4294868995), Inode bitmap at 524307 (+4294869011)
  Inode table at 525856-526367 (+4294870560)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 622592-655359
  Free inodes: 155649-163840
Group 20: (Blocks 655360-688127) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x5a42, unused inodes 8192
  Block bitmap at 524292 (+4294836228), Inode bitmap at 524308 (+4294836244)
  Inode table at 526368-526879 (+4294838304)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 655360-688127
  Free inodes: 163841-172032
  Free inodes: 163841-172032
Group 21: (Blocks 688128-720895) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xfa99, unused inodes 8192
  Block bitmap at 524293 (+4294803461), Inode bitmap at 524309 (+4294803477)
  Inode table at 526880-527391 (+4294806048)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 688128-720895
  Free inodes: 172033-180224
Group 22: (Blocks 720896-753663) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa520, unused inodes 8192
  Block bitmap at 524294 (+4294770694), Inode bitmap at 524310 (+4294770710)
  Inode table at 527392-527903 (+4294773792)
  18432 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 720896-739327
  Free inodes: 180225-188416
Group 23: (Blocks 753664-786431) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x134d, unused inodes 8192
  Block bitmap at 524295 (+4294737927), Inode bitmap at 524311 (+4294737943)
  Inode table at 527904-528415 (+4294741536)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 188417-196608
Group 24: (Blocks 786432-819199) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb79d, unused inodes 8192
  Block bitmap at 524296 (+4294705160), Inode bitmap at 524312 (+4294705176)
  Inode table at 528416-528927 (+4294709280)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 196609-204800
Group 25: (Blocks 819200-851967) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xc3b6, unused inodes 8192
  Backup superblock at 819200, Group descriptors at 819201-819208
  Reserved GDT blocks at 819209-820224
  Block bitmap at 524297 (+4294672393), Inode bitmap at 524313 (+4294672409)
  Inode table at 528928-529439 (+4294677024)
  1023 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 820225-821247
  Free inodes: 204801-212992
Group 26: (Blocks 851968-884735) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa39a, unused inodes 8192
  Block bitmap at 524298 (+4294639626), Inode bitmap at 524314 (+4294639642)
  Inode table at 529440-529951 (+4294644768)
  2047 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 856065-858111
  Free inodes: 212993-221184
Group 27: (Blocks 884736-917503) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xc203, unused inodes 8192
  Backup superblock at 884736, Group descriptors at 884737-884744
  Reserved GDT blocks at 884745-885760
  Block bitmap at 524299 (+4294606859), Inode bitmap at 524315 (+4294606875)
  Inode table at 529952-530463 (+4294612512)
  1023 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 885761-886783
  Free inodes: 221185-229376
Group 28: (Blocks 917504-950271) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb4f7, unused inodes 8192
  Block bitmap at 524300 (+4294574092), Inode bitmap at 524316 (+4294574108)
  Inode table at 530464-530975 (+4294580256)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 229377-237568
Group 29: (Blocks 950272-983039) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x142c, unused inodes 8192
  Block bitmap at 524301 (+4294541325), Inode bitmap at 524317 (+4294541341)
  Inode table at 530976-531487 (+4294548000)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 237569-245760
Group 30: (Blocks 983040-1015807) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb542, unused inodes 8192
  Block bitmap at 524302 (+4294508558), Inode bitmap at 524318 (+4294508574)
  Inode table at 531488-531999 (+4294515744)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 245761-253952
Group 31: (Blocks 1015808-1048575) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x1599, unused inodes 8192
  Block bitmap at 524303 (+4294475791), Inode bitmap at 524319 (+4294475807)
  Inode table at 532000-532511 (+4294483488)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 253953-262144
Group 32: (Blocks 1048576-1081343) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x304d, unused inodes 8192
  Block bitmap at 1048576 (+0), Inode bitmap at 1048592 (+16)
  Inode table at 1048608-1049119 (+32)
  24544 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1056800-1081343
  Free inodes: 262145-270336
Group 33: (Blocks 1081344-1114111) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x84a8, unused inodes 8192
  Block bitmap at 1048577 (+4294934529), Inode bitmap at 1048593 (+4294934545)
  Inode table at 1049120-1049631 (+4294935072)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 270337-278528
Group 34: (Blocks 1114112-1146879) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x25c6, unused inodes 8192
  Block bitmap at 1048578 (+4294901762), Inode bitmap at 1048594 (+4294901778)
  Inode table at 1049632-1050143 (+4294902816)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 278529-286720
Group 35: (Blocks 1146880-1179647) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x90af, unused inodes 8192
  Block bitmap at 1048579 (+4294868995), Inode bitmap at 1048595 (+4294869011)
  Inode table at 1050144-1050655 (+4294870560)
  2047 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1148929-1150975
  Free inodes: 286721-294912
Group 36: (Blocks 1179648-1212415) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x2719, unused inodes 8192
  Block bitmap at 1048580 (+4294836228), Inode bitmap at 1048596 (+4294836244)
  Inode table at 1050656-1051167 (+4294838304)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 294913-303104
Group 37: (Blocks 1212416-1245183) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x87c2, unused inodes 8192
  Block bitmap at 1048581 (+4294803461), Inode bitmap at 1048597 (+4294803477)
  Inode table at 1051168-1051679 (+4294806048)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 303105-311296
Group 38: (Blocks 1245184-1277951) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x26ac, unused inodes 8192
  Block bitmap at 1048582 (+4294770694), Inode bitmap at 1048598 (+4294770710)
  Inode table at 1051680-1052191 (+4294773792)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 311297-319488
Group 39: (Blocks 1277952-1310719) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe290, unused inodes 8192
  Block bitmap at 1048583 (+4294737927), Inode bitmap at 1048599 (+4294737943)
  Inode table at 1052192-1052703 (+4294741536)
  1552 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1305088-1306623, 1308656-1308671
  Free inodes: 319489-327680
Group 40: (Blocks 1310720-1343487) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xcac6, unused inodes 8192
  Block bitmap at 1048584 (+4294705160), Inode bitmap at 1048600 (+4294705176)
  Inode table at 1052704-1053215 (+4294709280)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1310720-1343487
  Free inodes: 327681-335872
Group 41: (Blocks 1343488-1376255) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x6a1d, unused inodes 8192
  Block bitmap at 1048585 (+4294672393), Inode bitmap at 1048601 (+4294672409)
  Inode table at 1053216-1053727 (+4294677024)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1343488-1376255
  Free inodes: 335873-344064
Group 42: (Blocks 1376256-1409023) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xcb73, unused inodes 8192
  Block bitmap at 1048586 (+4294639626), Inode bitmap at 1048602 (+4294639642)
  Inode table at 1053728-1054239 (+4294644768)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1376256-1409023
  Free inodes: 344065-352256
Group 43: (Blocks 1409024-1441791) [INODE_UNINIT, ITABLE_ZEROED]
Checksum 0x6ba8, unused inodes 8192
  Block bitmap at 1048587 (+4294606859), Inode bitmap at 1048603 (+4294606875)
  Inode table at 1054240-1054751 (+4294612512)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1409024-1441791
  Free inodes: 352257-360448
Group 44: (Blocks 1441792-1474559) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xc9ac, unused inodes 8192
  Block bitmap at 1048588 (+4294574092), Inode bitmap at 1048604 (+4294574108)
  Inode table at 1054752-1055263 (+4294580256)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1441792-1474559
  Free inodes: 360449-368640
Group 45: (Blocks 1474560-1507327) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x6977, unused inodes 8192
  Block bitmap at 1048589 (+4294541325), Inode bitmap at 1048605 (+4294541341)
  Inode table at 1055264-1055775 (+4294548000)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1474560-1507327
  Free inodes: 368641-376832
Group 46: (Blocks 1507328-1540095) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xc819, unused inodes 8192
  Block bitmap at 1048590 (+4294508558), Inode bitmap at 1048606 (+4294508574)
  Inode table at 1055776-1056287 (+4294515744)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1507328-1540095
  Free inodes: 376833-385024
Group 47: (Blocks 1540096-1572863) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x68c2, unused inodes 8192
  Block bitmap at 1048591 (+4294475791), Inode bitmap at 1048607 (+4294475807)
  Inode table at 1056288-1056799 (+4294483488)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1540096-1572863
  Free inodes: 385025-393216
Group 48: (Blocks 1572864-1605631) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x435b, unused inodes 8192
  Block bitmap at 1572864 (+0), Inode bitmap at 1572880 (+16)
  Inode table at 1572896-1573407 (+32)
  24544 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1581088-1605631
  Free inodes: 393217-401408
Group 49: (Blocks 1605632-1638399) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x3aec, unused inodes 8192
  Backup superblock at 1605632, Group descriptors at 1605633-1605640
  Reserved GDT blocks at 1605641-1606656
  Block bitmap at 1572865 (+4294934529), Inode bitmap at 1572881 (+4294934545)
  Inode table at 1573408-1573919 (+4294935072)
  31743 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1606657-1638399
  Free inodes: 401409-409600
Group 50: (Blocks 1638400-1671167) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbeb1, unused inodes 8192
  Block bitmap at 1572866 (+4294901762), Inode bitmap at 1572882 (+4294901778)
  Inode table at 1573920-1574431 (+4294902816)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1638400-1671167
  Free inodes: 409601-417792
Group 51: (Blocks 1671168-1703935) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x1e6a, unused inodes 8192
  Block bitmap at 1572867 (+4294868995), Inode bitmap at 1572883 (+4294869011)
  Inode table at 1574432-1574943 (+4294870560)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1671168-1703935
  Free inodes: 417793-425984
Group 52: (Blocks 1703936-1736703) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbc6e, unused inodes 8192
  Block bitmap at 1572868 (+4294836228), Inode bitmap at 1572884 (+4294836244)
  Inode table at 1574944-1575455 (+4294838304)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1703936-1736703
  Free inodes: 425985-434176
Group 53: (Blocks 1736704-1769471) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x1cb5, unused inodes 8192
  Block bitmap at 1572869 (+4294803461), Inode bitmap at 1572885 (+4294803477)
  Inode table at 1575456-1575967 (+4294806048)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1736704-1769471
  Free inodes: 434177-442368
Group 54: (Blocks 1769472-1802239) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbddb, unused inodes 8192
  Block bitmap at 1572870 (+4294770694), Inode bitmap at 1572886 (+4294770710)
  Inode table at 1575968-1576479 (+4294773792)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1769472-1802239
  Free inodes: 442369-450560
Group 55: (Blocks 1802240-1835007) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x3637, unused inodes 8192
  Block bitmap at 1572871 (+4294737927), Inode bitmap at 1572887 (+4294737943)
  Inode table at 1576480-1576991 (+4294741536)
  16206 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1802240-1816575, 1825280-1825535, 1825562-1825567, 1825580-1825583, 1825608-1825615, 1825624-1825631, 1825640-1825647, 1825672-1825695, 1825720-1825727, 1825752-1825759, 1825768-1825775, 1825844-1825855, 1829968-1830015, 1830464-1830911, 1831936-1832959
  Free inodes: 450561-458752
Group 56: (Blocks 1835008-1867775) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x4ed4, unused inodes 8192
  Block bitmap at 1572872 (+4294705160), Inode bitmap at 1572888 (+4294705176)
  Inode table at 1576992-1577503 (+4294709280)
  31712 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1836032-1837055, 1837064-1837087, 1837112-1867775
  Free inodes: 458753-466944
Group 57: (Blocks 1867776-1900543) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x190b, unused inodes 8192
  Block bitmap at 1572873 (+4294672393), Inode bitmap at 1572889 (+4294672409)
  Inode table at 1577504-1578015 (+4294677024)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1867776-1900543
  Free inodes: 466945-475136
Group 58: (Blocks 1900544-1933311) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb865, unused inodes 8192
  Block bitmap at 1572874 (+4294639626), Inode bitmap at 1572890 (+4294639642)
  Inode table at 1578016-1578527 (+4294644768)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1900544-1933311
  Free inodes: 475137-483328
Group 59: (Blocks 1933312-1966079) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x283f, unused inodes 8192
  Block bitmap at 1572875 (+4294606859), Inode bitmap at 1572891 (+4294606875)
  Inode table at 1578528-1579039 (+4294612512)
  31744 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1933312-1964031, 1965056-1966079
  Free inodes: 483329-491520
Group 60: (Blocks 1966080-1998847) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x5ecb, unused inodes 8192
  Block bitmap at 1572876 (+4294574092), Inode bitmap at 1572892 (+4294574108)
  Inode table at 1579040-1579551 (+4294580256)
  32767 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1966080-1966331, 1966333-1998847
  Free inodes: 491521-499712
Group 61: (Blocks 1998848-2031615) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x1a61, unused inodes 8192
  Block bitmap at 1572877 (+4294541325), Inode bitmap at 1572893 (+4294541341)
  Inode table at 1579552-1580063 (+4294548000)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 1998848-2031615
  Free inodes: 499713-507904
Group 62: (Blocks 2031616-2064383) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbb0f, unused inodes 8192
  Block bitmap at 1572878 (+4294508558), Inode bitmap at 1572894 (+4294508574)
  Inode table at 1580064-1580575 (+4294515744)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2031616-2064383
  Free inodes: 507905-516096
Group 63: (Blocks 2064384-2097151) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x1bd4, unused inodes 8192
  Block bitmap at 1572879 (+4294475791), Inode bitmap at 1572895 (+4294475807)
  Inode table at 1580576-1581087 (+4294483488)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2064384-2097151
  Free inodes: 516097-524288
Group 64: (Blocks 2097152-2129919) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x5a3a, unused inodes 8192
  Block bitmap at 2097152 (+0), Inode bitmap at 2097168 (+16)
  Inode table at 2097184-2097695 (+32)
  24544 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2105376-2129919
  Free inodes: 524289-532480
Group 65: (Blocks 2129920-2162687) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x06be, unused inodes 8192
  Block bitmap at 2097153 (+4294934529), Inode bitmap at 2097169 (+4294934545)
  Inode table at 2097696-2098207 (+4294935072)
32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2129920-2162687
  Free inodes: 532481-540672
Group 66: (Blocks 2162688-2195455) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x90d2, unused inodes 8192
  Block bitmap at 2097154 (+4294901762), Inode bitmap at 2097170 (+4294901778)
  Inode table at 2098208-2098719 (+4294902816)
  29712 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2162688-2175359, 2178416-2195455
  Free inodes: 540673-548864
Group 67: (Blocks 2195456-2228223) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x070b, unused inodes 8192
  Block bitmap at 2097155 (+4294868995), Inode bitmap at 2097171 (+4294869011)
  Inode table at 2098720-2099231 (+4294870560)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2195456-2228223
  Free inodes: 548865-557056
Group 68: (Blocks 2228224-2260991) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa50f, unused inodes 8192
  Block bitmap at 2097156 (+4294836228), Inode bitmap at 2097172 (+4294836244)
  Inode table at 2099232-2099743 (+4294838304)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2228224-2260991
  Free inodes: 557057-565248
Group 69: (Blocks 2260992-2293759) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x05d4, unused inodes 8192
  Block bitmap at 2097157 (+4294803461), Inode bitmap at 2097173 (+4294803477)
  Inode table at 2099744-2100255 (+4294806048)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2260992-2293759
  Free inodes: 565249-573440
Group 70: (Blocks 2293760-2326527) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa4ba, unused inodes 8192
  Block bitmap at 2097158 (+4294770694), Inode bitmap at 2097174 (+4294770710)
  Inode table at 2100256-2100767 (+4294773792)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2293760-2326527
  Free inodes: 573441-581632
Group 71: (Blocks 2326528-2359295) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x0461, unused inodes 8192
  Block bitmap at 2097159 (+4294737927), Inode bitmap at 2097175 (+4294737943)
  Inode table at 2100768-2101279 (+4294741536)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2326528-2359295
  Free inodes: 581633-589824
Group 72: (Blocks 2359296-2392063) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa0b1, unused inodes 8192
  Block bitmap at 2097160 (+4294705160), Inode bitmap at 2097176 (+4294705176)
  Inode table at 2101280-2101791 (+4294709280)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2359296-2392063
  Free inodes: 589825-598016
Group 73: (Blocks 2392064-2424831) [INODE_UNINIT, ITABLE_ZEROED]
 Checksum 0x006a, unused inodes 8192
  Block bitmap at 2097161 (+4294672393), Inode bitmap at 2097177 (+4294672409)
  Inode table at 2101792-2102303 (+4294677024)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2392064-2424831
  Free inodes: 598017-606208
Group 74: (Blocks 2424832-2457599) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa104, unused inodes 8192
  Block bitmap at 2097162 (+4294639626), Inode bitmap at 2097178 (+4294639642)
  Inode table at 2102304-2102815 (+4294644768)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2424832-2457599
  Free inodes: 606209-614400
Group 75: (Blocks 2457600-2490367) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x01df, unused inodes 8192
  Block bitmap at 2097163 (+4294606859), Inode bitmap at 2097179 (+4294606875)
  Inode table at 2102816-2103327 (+4294612512)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2457600-2490367
  Free inodes: 614401-622592
Group 76: (Blocks 2490368-2523135) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa3db, unused inodes 8192
  Block bitmap at 2097164 (+4294574092), Inode bitmap at 2097180 (+4294574108)
  Inode table at 2103328-2103839 (+4294580256)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2490368-2523135
  Free inodes: 622593-630784
Group 77: (Blocks 2523136-2555903) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x0300, unused inodes 8192
  Block bitmap at 2097165 (+4294541325), Inode bitmap at 2097181 (+4294541341)
  Inode table at 2103840-2104351 (+4294548000)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2523136-2555903
  Free inodes: 630785-638976
Group 78: (Blocks 2555904-2588671) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xa26e, unused inodes 8192
  Block bitmap at 2097166 (+4294508558), Inode bitmap at 2097182 (+4294508574)
  Inode table at 2104352-2104863 (+4294515744)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2555904-2588671
  Free inodes: 638977-647168
Group 79: (Blocks 2588672-2621439) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x02b5, unused inodes 8192
  Block bitmap at 2097167 (+4294475791), Inode bitmap at 2097183 (+4294475807)
  Inode table at 2104864-2105375 (+4294483488)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2588672-2621439
  Free inodes: 647169-655360
Group 80: (Blocks 2621440-2654207) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x292c, unused inodes 8192
  Block bitmap at 2621440 (+0), Inode bitmap at 2621456 (+16)
  Inode table at 2621472-2621983 (+32)
  24544 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2629664-2654207
  Free inodes: 655361-663552
Group 81: (Blocks 2654208-2686975) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x509b, unused inodes 8192
  Backup superblock at 2654208, Group descriptors at 2654209-2654216
  Reserved GDT blocks at 2654217-2655232
  Block bitmap at 2621441 (+4294934529), Inode bitmap at 2621457 (+4294934545)
  Inode table at 2621984-2622495 (+4294935072)
  31743 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2655233-2686975
  Free inodes: 663553-671744
Group 82: (Blocks 2686976-2719743) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd4c6, unused inodes 8192
  Block bitmap at 2621442 (+4294901762), Inode bitmap at 2621458 (+4294901778)
  Inode table at 2622496-2623007 (+4294902816)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2686976-2719743
  Free inodes: 671745-679936
Group 83: (Blocks 2719744-2752511) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x741d, unused inodes 8192
  Block bitmap at 2621443 (+4294868995), Inode bitmap at 2621459 (+4294869011)
  Inode table at 2623008-2623519 (+4294870560)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2719744-2752511
  Free inodes: 679937-688128
Group 84: (Blocks 2752512-2785279) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd619, unused inodes 8192
  Block bitmap at 2621444 (+4294836228), Inode bitmap at 2621460 (+4294836244)
  Inode table at 2623520-2624031 (+4294838304)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2752512-2785279
  Free inodes: 688129-696320
Group 85: (Blocks 2785280-2818047) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x76c2, unused inodes 8192
  Block bitmap at 2621445 (+4294803461), Inode bitmap at 2621461 (+4294803477)
  Inode table at 2624032-2624543 (+4294806048)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2785280-2818047
  Free inodes: 696321-704512
Group 86: (Blocks 2818048-2850815) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd7ac, unused inodes 8192
  Block bitmap at 2621446 (+4294770694), Inode bitmap at 2621462 (+4294770710)
  Inode table at 2624544-2625055 (+4294773792)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2818048-2850815
  Free inodes: 704513-712704
Group 87: (Blocks 2850816-2883583) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x7777, unused inodes 8192
  Block bitmap at 2621447 (+4294737927), Inode bitmap at 2621463 (+4294737943)
  Inode table at 2625056-2625567 (+4294741536)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2850816-2883583
  Free inodes: 712705-720896
Group 88: (Blocks 2883584-2916351) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd3a7, unused inodes 8192
  Block bitmap at 2621448 (+4294705160), Inode bitmap at 2621464 (+4294705176)
  Inode table at 2625568-2626079 (+4294709280)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2883584-2916351
  Free inodes: 720897-729088
Group 89: (Blocks 2916352-2949119) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x737c, unused inodes 8192
  Block bitmap at 2621449 (+4294672393), Inode bitmap at 2621465 (+4294672409)
  Inode table at 2626080-2626591 (+4294677024)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2916352-2949119
  Free inodes: 729089-737280
Group 90: (Blocks 2949120-2981887) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd212, unused inodes 8192
  Block bitmap at 2621450 (+4294639626), Inode bitmap at 2621466 (+4294639642)
  Inode table at 2626592-2627103 (+4294644768)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2949120-2981887
  Free inodes: 737281-745472
Group 91: (Blocks 2981888-3014655) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x72c9, unused inodes 8192
  Block bitmap at 2621451 (+4294606859), Inode bitmap at 2621467 (+4294606875)
  Inode table at 2627104-2627615 (+4294612512)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 2981888-3014655
  Free inodes: 745473-753664
Group 92: (Blocks 3014656-3047423) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd0cd, unused inodes 8192
  Block bitmap at 2621452 (+4294574092), Inode bitmap at 2621468 (+4294574108)
  Inode table at 2627616-2628127 (+4294580256)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3014656-3047423
  Free inodes: 753665-761856
Group 93: (Blocks 3047424-3080191) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x7016, unused inodes 8192
  Block bitmap at 2621453 (+4294541325), Inode bitmap at 2621469 (+4294541341)
  Inode table at 2628128-2628639 (+4294548000)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3047424-3080191
  Free inodes: 761857-770048
Group 94: (Blocks 3080192-3112959) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd178, unused inodes 8192
  Block bitmap at 2621454 (+4294508558), Inode bitmap at 2621470 (+4294508574)
  Inode table at 2628640-2629151 (+4294515744)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3080192-3112959
  Free inodes: 770049-778240
Group 95: (Blocks 3112960-3145727) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x71a3, unused inodes 8192
  Block bitmap at 2621455 (+4294475791), Inode bitm
Inode table at 2629152-2629663 (+4294483488)
 32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3112960-3145727
  Free inodes: 778241-786432
Group 96: (Blocks 3145728-3178495) [ITABLE_ZEROED]
  Checksum 0x792e, unused inodes 0
  Block bitmap at 3145728 (+0), Inode bitmap at 3145744 (+16)
  Inode table at 3145760-3146271 (+32)
  24543 free blocks, 8181 free inodes, 1 directories
  Free blocks: 3153953-3178495
  Free inodes: 786444-794624
Group 97: (Blocks 3178496-3211263) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x35a2, unused inodes 8192
  Block bitmap at 3145729 (+4294934529), Inode bitmap at 3145745 (+4294934545)
  Inode table at 3146272-3146783 (+4294935072)
  32763 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3178497, 3178502-3211263
  Free inodes: 794625-802816
Group 98: (Blocks 3211264-3244031) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x41fc, unused inodes 8192
  Block bitmap at 3145730 (+4294901762), Inode bitmap at 3145746 (+4294901778)
  Inode table at 3146784-3147295 (+4294902816)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3211264-3244031
  Free inodes: 802817-811008
Group 99: (Blocks 3244032-3276799) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe127, unused inodes 8192
  Block bitmap at 3145731 (+4294868995), Inode bitmap at 3145747 (+4294869011)
  Inode table at 3147296-3147807 (+4294870560)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3244032-3276799
  Free inodes: 811009-819200
Group 100: (Blocks 3276800-3309567) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x4323, unused inodes 8192
  Block bitmap at 3145732 (+4294836228), Inode bitmap at 3145748 (+4294836244)
  Inode table at 3147808-3148319 (+4294838304)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3276800-3309567
  Free inodes: 819201-827392
Group 101: (Blocks 3309568-3342335) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe3f8, unused inodes 8192
  Block bitmap at 3145733 (+4294803461), Inode bitmap at 3145749 (+4294803477)
  Inode table at 3148320-3148831 (+4294806048)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3309568-3342335
  Free inodes: 827393-835584
Group 102: (Blocks 3342336-3375103) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x4296, unused inodes 8192
  Block bitmap at 3145734 (+4294770694), Inode bitmap at 3145750 (+4294770710)
  Inode table at 3148832-3149343 (+4294773792)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3342336-3375103
  Free inodes: 835585-843776
Group 103: (Blocks 3375104-3407871) [INODE_UNINIT, ITABLE_ZEROED]
Group 103: (Blocks 3375104-3407871) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe24d, unused inodes 8192
  Block bitmap at 3145735 (+4294737927), Inode bitmap at 3145751 (+4294737943)
  Inode table at 3149344-3149855 (+4294741536)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3375104-3407871
  Free inodes: 843777-851968
Group 104: (Blocks 3407872-3440639) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x469d, unused inodes 8192
  Block bitmap at 3145736 (+4294705160), Inode bitmap at 3145752 (+4294705176)
  Inode table at 3149856-3150367 (+4294709280)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3407872-3440639
  Free inodes: 851969-860160
Group 105: (Blocks 3440640-3473407) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe646, unused inodes 8192
  Block bitmap at 3145737 (+4294672393), Inode bitmap at 3145753 (+4294672409)
  Inode table at 3150368-3150879 (+4294677024)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3440640-3473407
  Free inodes: 860161-868352
Group 106: (Blocks 3473408-3506175) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x4728, unused inodes 8192
  Block bitmap at 3145738 (+4294639626), Inode bitmap at 3145754 (+4294639642)
  Inode table at 3150880-3151391 (+4294644768)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3473408-3506175
  Free inodes: 868353-876544
Group 107: (Blocks 3506176-3538943) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe7f3, unused inodes 8192
  Block bitmap at 3145739 (+4294606859), Inode bitmap at 3145755 (+4294606875)
  Inode table at 3151392-3151903 (+4294612512)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3506176-3538943
  Free inodes: 876545-884736
Group 108: (Blocks 3538944-3571711) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x45f7, unused inodes 8192
  Block bitmap at 3145740 (+4294574092), Inode bitmap at 3145756 (+4294574108)
  Inode table at 3151904-3152415 (+4294580256)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3538944-3571711
  Free inodes: 884737-892928
Group 109: (Blocks 3571712-3604479) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe52c, unused inodes 8192
  Block bitmap at 3145741 (+4294541325), Inode bitmap at 3145757 (+4294541341)
  Inode table at 3152416-3152927 (+4294548000)
  32768 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 3571712-3604479
  Free inodes: 892929-901120
  Checksum 0x799d, unused inodes 8192
  Block bitmap at 5242892 (+4294574092), Inode bitmap at 5242908 (+4294574108)
  Inode table at 5249056-5249567 (+4294580256)
  959 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5636104-5636111, 5639550-5640002, 5640004-5640019, 5640021-5640114, 5640116-5640127, 5640129-5640191, 5640200-5640207, 5648267-5648383, 5652382-5652463, 5652524-5652575, 5656627-5656655, 5656668-5656671, 5668843-5668863
  Free inodes: 1409025-1417216
Group 173: (Blocks 5668864-5701631) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xb86a, unused inodes 8192
  Block bitmap at 5242893 (+4294541325), Inode bitmap at 5242909 (+4294541341)
  Inode table at 5249568-5250079 (+4294548000)
  134 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5687336-5687343, 5701506-5701631
  Free inodes: 1417217-1425408
Group 174: (Blocks 5701632-5734399) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xbdc9, unused inodes 8192
  Block bitmap at 5242894 (+4294508558), Inode bitmap at 5242910 (+4294508574)
  Inode table at 5250080-5250591 (+4294515744)
  16 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5734384-5734399
  Free inodes: 1425409-1433600
Group 175: (Blocks 5734400-5767167) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x952e, unused inodes 8192
  Block bitmap at 5242895 (+4294475791), Inode bitmap at 5242911 (+4294475807)
  Inode table at 5250592-5251103 (+4294483488)
  979 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5735617-5735947, 5735949-5735960, 5735962-5736447, 5739993-5740031, 5740514-5740527, 5740540-5740543, 5743571-5743615, 5744096-5744127, 5744620-5744623, 5767148-5767151, 5767160-5767167
  Free inodes: 1433601-1441792
Group 176: (Blocks 5767168-5799935) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xd6b8, unused inodes 8192
  Block bitmap at 5767168 (+0), Inode bitmap at 5767184 (+16)
  Inode table at 5767200-5767711 (+32)
  132 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5791636-5791743, 5799912-5799935
  Free inodes: 1441793-1449984
Group 177: (Blocks 5799936-5832703) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x231a, unused inodes 8192
  Block bitmap at 5767169 (+4294934529), Inode bitmap at 5767185 (+4294934545)
  Inode table at 5767712-5768223 (+4294935072)
  2274 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 5800040-5800047, 5800056-5800063, 5800072-5800079, 5800088-5800095, 5800104-5800111, 5800144-5800159, 5800181-5800207, 5800216-5800239, 5800248-5800255, 5800300-5800303, 5803729-5804383, 5804392-5804399, 5804432-5804447, 5804456-5804463, 5804500-5804511, 5804532-5804559, 5804584-5804607, 5804628-5804655, 5804676-5804703, 5831344-5831830, 5831836-5832606, 5832608-5832613, 5832615-5832632, 5832634-5832650, 5832652-5832655, 5832657-5832681, 5832683-5832696, 5832698-5832703
  Free inodes: 1449985-1458176
Group 178: (Blocks 5832704-5865471) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0x0e65, unused inodes 8192
  Block bitmap at 5767170 (+4294901762), Inode bitmap at 5767186 (+4294901778)
  Inode table at 5768224-5768735 (+4294902816)
  0 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 
  Free inodes: 1458177-1466368
Group 179: (Blocks 5865472-5898239) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xaebe, unused inodes 8192
  Block bitmap at 5767171 (+4294868995), Inode bitmap at 5767187 (+4294869011)
  Inode table at 5768736-5769247 

透过这些记录，我们可以很轻易的就知道哪些 inode 没有被使用，哪些 block 还可以记录