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http://guliqun1983.blog.163.com/blog/static/501116852011730535314/

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分类: LINUX

2013-04-24 10:30:28

声明:本文为原创
#####请转贴时保留以下内容######
作者GTT
本文档归属http://oldtown.cublog.cn/.转载请注明出处!
请提出宝贵意见Mail:mtloveft@hotmail.com
Linux Version:2.6.33
提示本文是关于file system 实现的介绍
 
既然文件系统要mount之后才能使用,那么简单介绍下mount命令。
我先进行一下简单的mount执行,之后看看log,执行过程如下

[root@localhost ~]# mount -l
/dev/mapper/VolGroup-lv_root on /            type ext4         (rw)
proc             on /proc          type proc         (rw)
sysfs            on /sys           type sysfs         (rw)
devpts            on /dev/pts         type devpts        (rw,gid=5,mode=620)
tmpfs            on /dev/shm         type tmpfs         (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1          on /boot          type ext4         (rw)
none             on /proc/sys/fs/binfmt_misc type binfmt_misc      (rw)
sunrpc            on /var/lib/nfs/rpc_pipefs type rpc_pipefs      (rw)
gvfs-fuse-daemon       on /root/.gvfs       type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)

[root@localhost ~]# mkdir /aaa
[root@localhost ~]# mkdir /aaa/a001
[root@localhost ~]# mkdir /aaa/a002
[root@localhost ~]# mkdir /bbb
[root@localhost ~]# mkdir /bbb/b001
[root@localhost ~]# mkdir /bbb/b002
[root@localhost ~]# ll /bbb/
total 8
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 b001
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 b002

[root@localhost ~]# mount -t ramfs 0 /bbb/b001
[root@localhost ~]# ll /bbb/
total 4
drwxr-xr-x. 2 root root    0 2010-08-23 23:20 b001
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 b002

[root@localhost ~]# mount -t ramfs 0 /bbb/b002
[root@localhost ~]# ll /bbb/
total 0
drwxr-xr-x. 2 root root 0 2010-08-23 23:20 b001
drwxr-xr-x. 2 root root 0 2010-08-23 23:20 b002
[root@localhost ~]# mount -l
/dev/mapper/VolGroup-lv_root on /               type ext4         (rw)
proc                on /proc             type proc         (rw)
sysfs               on /sys              type sysfs         (rw)
devpts               on /dev/pts           type devpts        (rw,gid=5,mode=620)
tmpfs               on /dev/shm           type tmpfs         (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1             on /boot            type ext4         (rw)
none                on /proc/sys/fs/binfmt_misc type binfmt_misc      (rw)
sunrpc               on /var/lib/nfs/rpc_pipefs type rpc_pipefs      (rw)
gvfs-fuse-daemon        on /root/.gvfs         type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)
0                 on /bbb/b001          type ramfs         (rw)
0                 on /bbb/b002          type ramfs         (rw)

[root@localhost ~]# mkdir /bbb/b001/gtt
[root@localhost ~]# ll /aaa/
total 8
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 a001
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 a002
[root@localhost ~]# mount --bind /bbb/b001 /aaa
[root@localhost ~]# ll /aaa/
total 0
drwxr-xr-x. 2 root root 0 2010-08-23 23:21 gtt
[root@localhost ~]# mount -l
/dev/mapper/VolGroup-lv_root on /               type ext4         (rw)
proc                on /proc             type proc         (rw)
sysfs               on /sys              type sysfs         (rw)
devpts               on /dev/pts           type devpts        (rw,gid=5,mode=620)
tmpfs               on /dev/shm           type tmpfs         (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1             on /boot            type ext4         (rw)
none                on /proc/sys/fs/binfmt_misc type binfmt_misc      (rw)
sunrpc               on /var/lib/nfs/rpc_pipefs type rpc_pipefs      (rw)
gvfs-fuse-daemon        on /root/.gvfs         type fuse.gvfs-fuse-daemon (rw,nosuid,nodev)
0                 on /bbb/b001          type ramfs         (rw)
0                 on /bbb/b002          type ramfs         (rw)

/bbb/b001                    on /aaa                     type none                  (rw,bind)
[root@localhost ~]# umount /aaa
[root@localhost ~]# ll /aaa/
total 8
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 a001
drwxr-xr-x. 2 root root 4096 2010-08-23 23:18 a002

[root@localhost ~]# mount --make-slave /bbb/b001
[root@localhost ~]# mount --make-share /bbb/b002
[root@localhost ~]# mount --make-unbindable /bbb/b001
[root@localhost ~]# mount --make-private /bbb/b001

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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