Info about the Linux ext filesystems
Filesystem options
as listed by 'tune2fs -l Device'
Filesystem volume name: <none>mke2fs -L [Label]
tune2fs -L [Label]
Last mounted on: /root(fstab)
Filesystem UUID: 3dc2fc2b-931e-492c-bd73-c1241e55c10emke2fs -U [UUID]
tune2fs -U [UUID|clear|random|time]
'random' option uses the 'uuidgen' command
Filesystem magic number: 0xEF53static value
ext2, ext3 and ext4 have a common magic number of 0xef53
Filesystem revision #: 1 (dynamic)mke2fs -r [0|1]
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
mke2fs -O [Options]
tune2fs -O [Options]
Filesystem flags: signed_directory_hashDefault mount options: (none)tune2fs -o [Options]
debug, bsdgroups, user_xattr, acl, uid16, journal_data, journal_data_ordered, journal_data_writeback
Filesystem state: cleanstatic
Errors behavior: Continuetune2fs -e [continue|remount-ro|panic]
Filesystem OS type: Linuxmke2fs -o [Name]
Inode count: 1310720mke2fs -N [Number]
Block count: 5242880Reserved block count: 262144mke2fs -m [Percentage]
tune2fs -r [Count]
tune2fs -m [Percentage]
actual percentage: "Reserved block count" *100 / "Block count"
default: 5
Free blocks: 4405971Free inodes: 1231655First block: 0Block size: 4096mke2fs -b [Blocksize] # 1024, 2048, 4096
Fragment size: 4096mke2fs -f [Bytes]
Reserved GDT blocks: 1022Blocks per group: 32768mke2fs -g [Blocks]
Fragments per group: 32768Inodes per group: 8192Inode blocks per group: 512Flex block group size: 16mke2fs -G [Number of groups]
Filesystem created: Thu Oct 14 14:34:50 2010static value
Last mount time: Fri Nov 5 09:58:33 2010static value
Last write time: Fri Nov 5 09:58:33 2010static value
Mount count: 4tune2fs -C [Count]
Maximum mount count: -1tune2fs -c [Count]
Last checked: Thu Oct 14 14:34:50 2010tune2fs -T [strftime|now]
Check interval: 0 (<none>)tune2fs -i [Interval(d|w|m)]
Lifetime writes: 5477 MBReserved blocks uid: 0 (user root)tune2fs -u [User(name|id)]
Reserved blocks gid: 0 (group root)tune2fs -g [Group(name|id)]
First inode: 11Inode size: 256mke2fs -I [Bytes]
cannot be increased
Required extra isize: 28Desired extra isize: 28Journal inode: 8First orphan inode: 1179845Default directory hash: half_md4Directory Hash Seed: 165766e9-88bb-4b00-94c3-eae4bdbed865related to the dir_index feature
Journal backup: inode blocksJournal features: journal_incompat_revokeJournal size: 128MJournal length: 32768Journal sequence: 0x0000be2fJournal start: 18366---
Missing/Unknown
tune2fs:
-j journal options
-M last-mounted-directory
mkfs:
-E extended-options
-i bytes-per-inode
-M last-mounted-directory
-t fs-type
-T usage-type