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mke2fs -F -o Linux -t ext4 -O ^metadata_csum,^uninit_bg -D $LOOP
Creating filesystem with 32768 4k blocks and 32768 inodes
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
debugfs -D -R stats $LOOP
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 flex_bg sparse_super large_file huge_file dir_nlink extra_isize
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 32768
Block count: 32768
Reserved block count: 1638
Overhead clusters: 6155
Free blocks: 26607
Free inodes: 32757
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 7
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 32768
Inode blocks per group: 2048
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
Directories: 2
Group 0: block bitmap at 9, inode bitmap at 25, inode table at 41
26607 free blocks, 32757 free inodes, 2 used directories
e2fsck -fn -N test_filesys $LOOP
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_filesys: 11/32768 files (9.1% non-contiguous), 6161/32768 blocks
Exit status is 0
e2fsck -fn -N test_filesys $TMPFILE
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_filesys: 11/32768 files (9.1% non-contiguous), 6161/32768 blocks
Exit status is 0
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