at_shiita.ishigaki
2021年11月19日 9時17分
ext2・ext3・ext4ファイルシステムの情報を表示するにはdumpe2fsコマンドを使用します。
※ここでは例として、ファイルシステムがext4の/dev/mmcblk0p2の情報を表示します。
[armadillo ~]# df -Tt ext4 Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/mmcblk0p2 ext4 3424176 657008 2573512 21% / [armadillo ~]# dumpe2fs /dev/mmcblk0p2 dumpe2fs 1.44.5 (15-Dec-2018) Filesystem volume name: <none> Last mounted on: / Filesystem UUID: d5e36677-0657-4e29-911d-7d1e54e554d1 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize ：（省略） Group 27: (Blocks 884736-886359) csum 0x4090 [INODE_UNINIT, ITABLE_ZEROED] Backup superblock at 884736, Group descriptors at 884737-884737 Reserved GDT blocks at 884738-884953 Block bitmap at 524299 (bg #16 + 11) Inode bitmap at 524315 (bg #16 + 27) Inode table at 529765-530259 (bg #16 + 5477) 1406 free blocks, 7920 free inodes, 0 directories, 7920 unused inodes Free blocks: 884954-886359 Free inodes: 213841-221760
スーパーブロックのみ表示するには-hオプションを使用します。
[armadillo ~]# dumpe2fs /dev/mmcblk0p2 -h dumpe2fs 1.44.5 (15-Dec-2018) Filesystem volume name: <none> Last mounted on: / Filesystem UUID: d5e36677-0657-4e29-911d-7d1e54e554d1 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: unsigned_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 221760 Block count: 886360 Reserved block count: 44318 Free blocks: 693055 Free inodes: 203454 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 216 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 7920 Inode blocks per group: 495 Flex block group size: 16 Filesystem created: Thu Jan 1 09:00:18 1970 Last mount time: Thu Feb 14 19:12:00 2019 Last write time: Thu Jan 1 09:02:23 1970 Mount count: 115 Maximum mount count: -1 Last checked: Thu Jan 1 09:00:18 1970 Check interval: 0 (<none>) Lifetime writes: 6310 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 31627d6c-8337-493e-af6f-c5bb5dff8870 Journal backup: inode blocks Journal features: journal_incompat_revoke Journal size: 64M Journal length: 16384 Journal sequence: 0x00001062 Journal start: 1