dumpe2fs

Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          bb672a60-eb3b-4e85-a27c-0b5f666d5e28
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:              16662528
Block count:              66647040
Reserved block count:     3332352
Free blocks:              63143615
Free inodes:              16217011
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1008
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 Aug 17 13:48:28 2015
Last mount time:          Mon Aug 22 16:43:15 2016
Last write time:          Mon Aug 22 16:43:15 2016
Mount count:              1
Maximum mount count:      -1
Last checked:             Mon Aug 22 16:42:49 2016
Check interval:           0 (<none>)
Lifetime writes:          366 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:       12582920
Default directory hash:   half_md4
Directory Hash Seed:      7b731bc4-3121-49b7-90c7-39fac7ab4482
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Journal size:             128M
Journal length:           32768
Journal sequence:         0x000486a2
Journal start:            18263


Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
  Checksum 0x14c6, unused inodes 5793
  Primary superblock at 0, Group descriptors at 1-16
  Reserved GDT blocks at 17-1024
  Block bitmap at 1025 (+1025), Inode bitmap at 1041 (+1041)
  Inode table at 1057-1568 (+1057)
  23055 free blocks, 6115 free inodes, 460 directories, 5793 unused inodes
  Free blocks: 9712-9774, 9776-32767
  Free inodes: 2065-2067, 2079-2397, 2400-8192
Group 1: (Blocks 32768-65535) [INODE_UNINIT, ITABLE_ZEROED]
  Checksum 0xe2b1, unused inodes 8192
  Backup superblock at 32768, Group descriptors at 32769-32784
  Reserved GDT blocks at 32785-33792
  Block bitmap at 1026 (bg #0 + 1026), Inode bitmap at 1042 (bg #0 + 1042)
  Inode table at 1569-2080 (bg #0 + 1569)
  4025 free blocks, 8192 free inodes, 0 directories, 8192 unused inodes
  Free blocks: 37815, 37887, 38703, 39539, 40579, 40975, 40989, 41003, 41011, 41113, 41183, 41189, 41209, 41227, 41519, 44319, 45759, 46667, 47319, 47567, 47883, 48181, 48203, 48235, 48455, 48587, 49095, 49151, 50207, 50911, 51163, 51313, 52503, 52831, 53215, 54519, 54575, 54721, 55143, 55161, 55223, 55463, 55541, 55589, 55601, 55681, 55693, 55717, 55723, 55771, 55789, 55827, 55855, 55883, 56039, 56083, 56233, 56299, 56333, 56391, 56429, 56501, 56517, 56539, 56559, 56569, 56575, 56587, 56595, 56639, 56649, 57119, 57291, 57339, 57371, 57381, 57399, 57627, 57647, 57959, 58055, 58095, 58867, 59479, 59617, 59637, 59689, 59695, 59781, 59891, 59902-59903, 59951, 59979, 60100-60103, 60122-60127, 60186-60191, 60215-60346, 60348-60351, 60375-60415, 61487-61567, 61673-61823, 61927-61951, 62055-65535
  Free inodes: 8193-16384
...