dumpe2fs /dev/sda1

Filesystem volume name: <none>
Last mounted on: /
Filesystem UUID: 77a65c98-79e9-427b-8e4b-bb3fbfe38ce9
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: 3596288
Block count: 14356966
Reserved block count: 717848
Free blocks: 12364794
Free inodes: 3373501
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1020
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
RAID stride: 32732
Flex block group size: 16
Filesystem created: Fri Aug 16 14:52:58 2013
Last mount time: Wed Aug 21 09:55:41 2013
Last write time: Wed Aug 21 09:55:41 2013
Mount count: 9
Maximum mount count: -1
Last checked: Sun Aug 18 15:44:04 2013
Check interval: 0 (<none>)
Lifetime writes: 21 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: 31309
Default directory hash: half_md4
Directory Hash Seed: 74d90e7d-2260-4404-9657-47c980694491
Journal backup: inode blocks
Journal features: journal_incompat_revoke
Journal size: 128M
Journal length: 32768
Journal sequence: 0x0000f9fc
Journal start: 5886


Group 0: (Blocks 0-32767) [ITABLE_ZEROED]
Checksum 0x5ebb, unused inodes 0
Primary superblock at 0, Group descriptors at 1-4
Reserved GDT blocks at 5-1024
Block bitmap at 1025 (+1025), Inode bitmap at 1041 (+1041)
Inode table at 1057-1568 (+1057)
62 free blocks, 0 free inodes, 1328 directories
Free blocks: 9477, 9479-9505, 10124-10157
Free inodes:
Group 1: (Blocks 32768-65535) [ITABLE_ZEROED]
Checksum 0xf08a, unused inodes 0
Backup superblock at 32768, Group descriptors at 32769-32772
Reserved GDT blocks at 32773-33792
Block bitmap at 1026 (bg #0 + 1026), Inode bitmap at 1042 (bg #0 + 1042)
Inode table at 1569-2080 (bg #0 + 1569)
0 free blocks, 0 free inodes, 1092 directories
Free blocks:
Free inodes: