extfs
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-c1241e55c10e
mke2fs -U [UUID]
tune2fs -U [UUID|clear|random|time]
'random' option uses the 'uuidgen' command
Filesystem magic number: 0xEF53
static 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_hash
Default mount options: (none)
tune2fs -o [Options]
debug, bsdgroups, user_xattr, acl, uid16, journal_data, journal_data_ordered, journal_data_writeback
Filesystem state: clean
static
Errors behavior: Continue
tune2fs -e [continue|remount-ro|panic]
Filesystem OS type: Linux
mke2fs -o [Name]
Inode count: 1310720
mke2fs -N [Number]
Block count: 5242880
Reserved block count: 262144
mke2fs -m [Percentage]
tune2fs -r [Count]
tune2fs -m [Percentage]
actual percentage: "Reserved block count" *100 / "Block count"
default: 5
Free blocks: 4405971
Free inodes: 1231655
First block: 0
Block size: 4096
mke2fs -b [Blocksize] # 1024, 2048, 4096
Fragment size: 4096
mke2fs -f [Bytes]
Reserved GDT blocks: 1022
Blocks per group: 32768
mke2fs -g [Blocks]
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Flex block group size: 16
mke2fs -G [Number of groups]
Filesystem created: Thu Oct 14 14:34:50 2010
static value
Last mount time: Fri Nov 5 09:58:33 2010
static value
Last write time: Fri Nov 5 09:58:33 2010
static value
Mount count: 4
tune2fs -C [Count]
Maximum mount count: -1
tune2fs -c [Count]
Last checked: Thu Oct 14 14:34:50 2010
tune2fs -T [strftime|now]
Check interval: 0 (<none>)
tune2fs -i [Interval(d|w|m)]
Lifetime writes: 5477 MB
Reserved blocks uid: 0 (user root)
tune2fs -u [User(name|id)]
Reserved blocks gid: 0 (group root)
tune2fs -g [Group(name|id)]
First inode: 11
Inode size: 256
mke2fs -I [Bytes]
cannot be increased
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 1179845
Default directory hash: half_md4
Directory Hash Seed: 165766e9-88bb-4b00-94c3-eae4bdbed865
related to the dir_index feature
Journal backup: inode blocks
Journal features: journal_incompat_revoke
Journal size: 128M
Journal length: 32768
Journal sequence: 0x0000be2f
Journal 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