最後更新: 2021-05-13

目錄

• tune2fs
• dumpe2fs

tune2fs

Max-mount-counts

-c max-mount-counts

當 over max-mount-counts 時, device 會拒絕被 mount. 0 or -1 就不會拒絕被 mount

i.e.

tune2fs -c 0 /dev/sdb1

tune2fs 1.42.13 (17-May-2015)
Setting maximal mount count to -1

Reserved space for root

tune2fs -m 0 /dev/sdb1

Set Label

tune2fs -L usb-bak-dsk /dev/sdb1

List the contents of the file system superblock (-l)

tune2fs -l /dev/sdg1

Filesystem volume name:   usb-bak-dsk
Last mounted on:          /backup/usb-bak-dsk
Filesystem UUID:          7a12a169-fe46-44e9-9660-d31cc4535139
...
Filesystem features:      has_journal ext_attr resize_inode ...
...
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
...
Inode count:              30523392
Block count:              122088192
Reserved block count:     6104409
Overhead clusters:        2196820
Free blocks:              119891365
Free inodes:              30523381
First block:              0
Block size:               4096
...
Filesystem created:       Fri Mar 10 21:51:41 2023
Last mount time:          Fri May 12 21:40:05 2023
Last write time:          Fri May 12 21:40:05 2023
Mount count:              6
Maximum mount count:      -1
Last checked:             Fri Mar 10 21:51:41 2023
Check interval:           0 (<none>)
Lifetime writes:          4306 MB
...

dumpe2fs

dumpe2fs -h /dev/sda1 | grep -i "default mount options"

-h     only display the superblock information and not any of the block group descriptor detail information.

e.g.

dumpe2fs -h /dev/vda1

dumpe2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          /boot
Filesystem UUID:          0d2773f2-df0a-4587-bcf4-bacfa7c2cb5e
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 huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              51200
Block count:              204800
Reserved block count:     10240
Free blocks:              81090
Free inodes:              51144
First block:              1
Block size:               1024
Fragment size:            1024
Reserved GDT blocks:      256
Blocks per group:         8192
Fragments per group:      8192
Inodes per group:         2048
Inode blocks per group:   256
Flex block group size:    16
Filesystem created:       Wed Aug  8 02:11:42 2012
Last mount time:          Wed Oct 16 12:24:00 2013
Last write time:          Wed Oct 16 12:24:00 2013
Mount count:              26
Maximum mount count:      -1
Last checked:             Wed Aug  8 02:11:42 2012
Check interval:           0 (<none>)
Lifetime writes:          121 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      b5db19f2-3cf3-462e-9e8a-ef06ab596d89
Journal backup:           inode blocks
Journal features:         (none)
Journal size:             4096k
Journal length:           4096
Journal sequence:         0x00000059
Journal start:            1