LPI学习-----3

[root@btg linux-2.6]# truncate --size 128M fsfile
[root@btg linux-2.6]# mkfs.ext4 -F fsfile
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=1024 (log=0)
分块大小=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
32768 inodes, 131072 blocks
6553 blocks (5.00%) reserved for the super user
第一个数据块=1
Maximum filesystem blocks=67371008
16 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729

正在写入inode表: 完成
Creating journal (4096 blocks): 完成
Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@btg linux-2.6]#
[root@btg linux-2.6]# losetup /dev/loop0 fsfile
[root@btg linux-2.6]# mount /dev/loop0 mnt
[root@btg linux-2.6]#

[root@btg linux-2.6]# tune2fs -l /opt/linux-2.6/fsfile
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          1a1354d1-3a6d-4a32-bff6-6f0460d7173a
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:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              32768
Block count:              131072
Reserved block count:     6553
Free blocks:              121285
Free inodes:              32757
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:       Thu Jun  2 15:15:12 2011
Last mount time:          Thu Jun  2 15:15:50 2011
Last write time:          Thu Jun  2 15:15:50 2011
Mount count:              1
Maximum mount count:      33
Last checked:             Thu Jun  2 15:15:12 2011
Check interval:           15552000 (6 months)
Next check after:         Tue Nov 29 15:15:12 2011
Lifetime writes:          8 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:      1514e018-3be3-4cdf-a60c-602892d9049f
Journal backup:           inode blocks
[root@btg linux-2.6]#

[root@btg linux-2.6]# tune2fs -L "HelloEXAMPLE" /opt/linux-2.6/fsfile
tune2fs 1.41.12 (17-May-2010)
[root@btg linux-2.6]# tune2fs -l /opt/linux-2.6/fsfile |grep "Filesystem volume name"
Filesystem volume name:   HelloEXAMPLE
[root@btg linux-2.6]#

上面可以查看/dev/sda1上面的左右的可调参数

-c是设置最大挂载次数

-i是设定两次文件系统检查之间的最长时间间隔

-L设置label

-j 设置has_journal功能标记

-r设置保留块数