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: Last mounted on: 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