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      1 Filesystem volume name:   <none>
      2 Last mounted on:          <not available>
      3 Filesystem magic number:  0xEF53
      4 Filesystem revision #:    1 (dynamic)
      5 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
      6 Default mount options:    (none)
      7 Filesystem state:         clean
      8 Errors behavior:          Continue
      9 Filesystem OS type:       Linux
     10 Inode count:              1024
     11 Block count:              16384
     12 Reserved block count:     819
     13 Free blocks:              14786
     14 Free inodes:              1005
     15 First block:              1
     16 Block size:               1024
     17 Fragment size:            1024
     18 Group descriptor size:    64
     19 Reserved GDT blocks:      127
     20 Blocks per group:         8192
     21 Fragments per group:      8192
     22 Inodes per group:         512
     23 Inode blocks per group:   128
     24 Flex block group size:    16
     25 Mount count:              0
     26 Check interval:           15552000 (6 months)
     27 Reserved blocks uid:      0
     28 Reserved blocks gid:      0
     29 First inode:              11
     30 Inode size:	          256
     31 Required extra isize:     32
     32 Desired extra isize:      32
     33 Journal inode:            8
     34 Default directory hash:   half_md4
     35 Journal backup:           inode blocks
     36 Checksum type:            crc32c
     37 Journal features:         (none)
     38 Journal size:             1024k
     39 Journal length:           1024
     40 Journal sequence:         0x00000001
     41 Journal start:            0
     42 
     43 
     44 Group 0: (Blocks 1-8192)
     45   Primary superblock at 1, Group descriptors at 2-2
     46   Reserved GDT blocks at 3-129
     47   Block bitmap at 130 (+129)
     48   Inode bitmap at 132 (+131)
     49   Inode table at 134-261 (+133)
     50   7748 free blocks, 493 free inodes, 4 directories, 493 unused inodes
     51   Free blocks: 445-8192
     52   Free inodes: 20-512
     53 Group 1: (Blocks 8193-16383) [INODE_UNINIT]
     54   Backup superblock at 8193, Group descriptors at 8194-8194
     55   Reserved GDT blocks at 8195-8321
     56   Block bitmap at 131 (bg #0 + 130)
     57   Inode bitmap at 133 (bg #0 + 132)
     58   Inode table at 262-389 (bg #0 + 261)
     59   7038 free blocks, 512 free inodes, 0 directories, 512 unused inodes
     60   Free blocks: 9346-16383
     61   Free inodes: 513-1024
     62 debugfs: stat /emptyfile
     63 Inode: III   Type: regular    
     64 Size: 0
     65 Fragment:  Address: 0    Number: 0    Size: 0
     66 debugfs: stat /bigfile
     67 Inode: III   Type: regular    
     68 Size: 32768
     69 Fragment:  Address: 0    Number: 0    Size: 0
     70 debugfs: stat /sparsefile
     71 Inode: III   Type: regular    
     72 Size: 1073741825
     73 Fragment:  Address: 0    Number: 0    Size: 0
     74 debugfs: stat /bigzerofile
     75 Inode: III   Type: regular    
     76 Size: 1073741825
     77 Fragment:  Address: 0    Number: 0    Size: 0
     78 debugfs: stat /fifo
     79 debugfs: stat /emptydir
     80 Inode: III   Type: directory    
     81 Size: 1024
     82 Fragment:  Address: 0    Number: 0    Size: 0
     83 debugfs: stat /dir
     84 Inode: III   Type: directory    
     85 Size: 1024
     86 Fragment:  Address: 0    Number: 0    Size: 0
     87 debugfs: stat /dir/file
     88 Inode: III   Type: regular    
     89 Size: 8
     90 Fragment:  Address: 0    Number: 0    Size: 0
     91 debugfs: ex /emptyfile
     92 Level Entries       Logical      Physical Length Flags
     93 debugfs: ex /bigfile
     94 Level Entries       Logical      Physical Length Flags
     95 X 0/0 1/1 0-31 AAA-BBB 32 
     96 debugfs: ex /sparsefile
     97 Level Entries           Logical      Physical Length Flags
     98 Y 0/1 1/1 1-1048576 AAA 1048576
     99 X 1/1 1/5 1-1 AAA-BBB 1 
    100 X 1/1 2/5 512-512 AAA-BBB 1 
    101 X 1/1 3/5 1024-1024 AAA-BBB 1 
    102 X 1/1 4/5 524288-524288 AAA-BBB 1 
    103 X 1/1 5/5 1048576-1048576 AAA-BBB 1 
    104 debugfs: ex /bigzerofile
    105 Level Entries           Logical      Physical Length Flags
    106 debugfs: ex /dir
    107 Level Entries       Logical      Physical Length Flags
    108 X 0/0 1/1 0-0 AAA-BBB 1 
    109 debugfs: ex /dir/file
    110 Level Entries       Logical      Physical Length Flags
    111 X 0/0 1/1 0-0 AAA-BBB 1 
    112 Pass 1: Checking inodes, blocks, and sizes
    113 Pass 2: Checking directory structure
    114 Pass 3: Checking directory connectivity
    115 Pass 4: Checking reference counts
    116 Pass 5: Checking group summary information
    117 test.img: 19/1024 files (0.0% non-contiguous), 1598/16384 blocks
    118