1mke2fs -F -o Linux -t ext4 -O ^metadata_csum,^uninit_bg -D $LOOP 2Creating filesystem with 32768 4k blocks and 32768 inodes 3 4Allocating group tables: done 5Writing inode tables: done 6Creating journal (4096 blocks): done 7Writing superblocks and filesystem accounting information: done 8 9debugfs -D -R stats $LOOP 10Filesystem volume name: <none> 11Last mounted on: <not available> 12Filesystem magic number: 0xEF53 13Filesystem revision #: 1 (dynamic) 14Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file dir_nlink extra_isize 15Default mount options: (none) 16Filesystem state: clean 17Errors behavior: Continue 18Filesystem OS type: Linux 19Inode count: 32768 20Block count: 32768 21Reserved block count: 1638 22Overhead clusters: 5131 23Free blocks: 27631 24Free inodes: 32757 25First block: 0 26Block size: 4096 27Fragment size: 4096 28Reserved GDT blocks: 7 29Blocks per group: 32768 30Fragments per group: 32768 31Inodes per group: 32768 32Inode blocks per group: 1024 33Flex block group size: 16 34Mount count: 0 35Check interval: 15552000 (6 months) 36Reserved blocks uid: 0 37Reserved blocks gid: 0 38First inode: 11 39Inode size: 128 40Journal inode: 8 41Default directory hash: half_md4 42Journal backup: inode blocks 43Directories: 2 44 Group 0: block bitmap at 9, inode bitmap at 25, inode table at 41 45 27631 free blocks, 32757 free inodes, 2 used directories 46e2fsck -fn -N test_filesys $LOOP 47Pass 1: Checking inodes, blocks, and sizes 48Pass 2: Checking directory structure 49Pass 3: Checking directory connectivity 50Pass 4: Checking reference counts 51Pass 5: Checking group summary information 52test_filesys: 11/32768 files (9.1% non-contiguous), 5137/32768 blocks 53Exit status is 0 54e2fsck -fn -N test_filesys $TMPFILE 55Pass 1: Checking inodes, blocks, and sizes 56Pass 2: Checking directory structure 57Pass 3: Checking directory connectivity 58Pass 4: Checking reference counts 59Pass 5: Checking group summary information 60test_filesys: 11/32768 files (9.1% non-contiguous), 5137/32768 blocks 61Exit status is 0 62