Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent 64bit flex_bg sparse_super huge_file dir_nlink extra_isize metadata_csum
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1024
Block count:              16384
Reserved block count:     819
Free blocks:              14786
Free inodes:              1005
First block:              1
Block size:               1024
Fragment size:            1024
Group descriptor size:    64
Reserved GDT blocks:      127
Blocks per group:         8192
Fragments per group:      8192
Inodes per group:         512
Inode blocks per group:   128
Flex block group size:    16
Mount count:              0
Check interval:           15552000 (6 months)
Reserved blocks uid:      0
Reserved blocks gid:      0
First inode:              11
Inode size:	          256
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
Default directory hash:   half_md4
Journal backup:           inode blocks
Checksum type:            crc32c
Journal features:         (none)
Journal size:             1024k
Journal length:           1024
Journal sequence:         0x00000001
Journal start:            0


Group 0: (Blocks 1-8192)
  Primary superblock at 1, Group descriptors at 2-2
  Reserved GDT blocks at 3-129
  Block bitmap at 130 (+129)
  Inode bitmap at 132 (+131)
  Inode table at 134-261 (+133)
  7748 free blocks, 493 free inodes, 4 directories, 493 unused inodes
  Free blocks: 445-8192
  Free inodes: 20-512
Group 1: (Blocks 8193-16383) [INODE_UNINIT]
  Backup superblock at 8193, Group descriptors at 8194-8194
  Reserved GDT blocks at 8195-8321
  Block bitmap at 131 (bg #0 + 130)
  Inode bitmap at 133 (bg #0 + 132)
  Inode table at 262-389 (bg #0 + 261)
  7038 free blocks, 512 free inodes, 0 directories, 512 unused inodes
  Free blocks: 9346-16383
  Free inodes: 513-1024
debugfs: stat /emptyfile
Inode: III   Type: regular    
Size: 0
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /bigfile
Inode: III   Type: regular    
Size: 32768
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /sparsefile
Inode: III   Type: regular    
Size: 1073741825
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /bigzerofile
Inode: III   Type: regular    
Size: 1073741825
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /fifo
debugfs: stat /emptydir
Inode: III   Type: directory    
Size: 1024
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /dir
Inode: III   Type: directory    
Size: 1024
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: stat /dir/file
Inode: III   Type: regular    
Size: 8
Fragment:  Address: 0    Number: 0    Size: 0
debugfs: ex /emptyfile
Level Entries       Logical      Physical Length Flags
debugfs: ex /bigfile
Level Entries       Logical      Physical Length Flags
X 0/0 1/1 0-31 AAA-BBB 32 
debugfs: ex /sparsefile
Level Entries           Logical      Physical Length Flags
Y 0/1 1/1 1-1048576 AAA 1048576
X 1/1 1/5 1-1 AAA-BBB 1 
X 1/1 2/5 512-512 AAA-BBB 1 
X 1/1 3/5 1024-1024 AAA-BBB 1 
X 1/1 4/5 524288-524288 AAA-BBB 1 
X 1/1 5/5 1048576-1048576 AAA-BBB 1 
debugfs: ex /bigzerofile
Level Entries           Logical      Physical Length Flags
debugfs: ex /dir
Level Entries       Logical      Physical Length Flags
X 0/0 1/1 0-0 AAA-BBB 1 
debugfs: ex /dir/file
Level Entries       Logical      Physical Length Flags
X 0/0 1/1 0-0 AAA-BBB 1 
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
test.img: 19/1024 files (0.0% non-contiguous), 1598/16384 blocks