loop特殊装置挂载练习

[root@localhost ~]# dd if=/dev/zero of=/home/loopdev bs=1M count=512
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 1.03367 seconds, 519 MB/s
[root@localhost ~]# ll /home
总计 524820
-rw-r--r-- 1 root root 536870912 10-28 18:48 loopdev
drwx------ 2 root root     16384 09-13 00:53 lost+found

[root@localhost ~]# mkfs -t ext3 /home/loopdev
mke2fs 1.39 (29-May-2006)
/home/loopdev is not a block special device.
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
131072 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67633152
64 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@localhost ~]# mount -o loop /home/loopdev /media/cdrom
[root@localhost ~]# df
文件系统               1K-块        已用     可用 已用% 挂载点
/dev/sda2              9920624   2637116   6771440  29% /
/dev/sda5              9297996    677100   8140956   8% /home
/dev/sda1               101086     11534     84333  13% /boot
tmpfs                   517552         0    517552   0% /dev/shm
/home/loopdev           507748     18768    462766   4% /media/cdrom
[root@localhost ~]# ll /media/cdrom
总计 12
drwx------ 2 root root 12288 10-28 18:50 lost+found

[root@localhost ~]# mkdir /mnt/centos_dvd
[root@localhost ~]# mount -o loop /root/CentOS-5.5-i386-bin-DVD.iso /mnt/centos_dvd/
[root@localhost ~]# df
文件系统               1K-块        已用     可用 已用% 挂载点
/dev/sda2              9920624   3016248   6392308  33% /
/dev/sda5              9297996    677100   8140956   8% /home
/dev/sda1               101086     11534     84333  13% /boot
tmpfs                   517552         0    517552   0% /dev/shm
/home/loopdev           507748     18768    462766   4% /media/cdrom
/root/CentOS-5.5-i386-bin-DVD.iso
                       4087030   4087030         0 100% /mnt/centos_dvd
[root@localhost ~]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/sda2             9.5G  3.0G  6.1G  33% /
/dev/sda5             8.9G  662M  7.8G   8% /home
/dev/sda1              99M   12M   83M  13% /boot
tmpfs                 506M     0  506M   0% /dev/shm
/home/loopdev         496M   19M  452M   4% /media/cdrom
/root/CentOS-5.5-i386-bin-DVD.iso
                      3.9G  3.9G     0 100% /mnt/centos_dvd

[root@localhost ~]# ll /mnt/centos_dvd/
总计 496
drwxrwxr-x 2  501  501 421888 2010-04-30 CentOS
-rw-r--r-- 1 root root    212 2008-06-15 EULA
-rw-r--r-- 1 root root  18009 2008-06-15 GPL
drwxr-xr-x 4 root root   2048 2010-04-30 images
drwxr-xr-x 2 root root   2048 2010-04-30 isolinux
drwxr-xr-x 2 root root  22528 2010-04-27 NOTES
-rw-r--r-- 1 root root    655 2010-04-27 RELEASE-NOTES-cs
-rw-r--r-- 1 root root   1401 2010-04-27 RELEASE-NOTES-cs.html
-rw-r--r-- 1 root root    839 2010-04-27 RELEASE-NOTES-de
-rw-r--r-- 1 root root   1571 2010-04-27 RELEASE-NOTES-de.html
-rw-r--r-- 1 root root    694 2010-04-27 RELEASE-NOTES-en
-rw-r--r-- 1 root root   1367 2010-04-27 RELEASE-NOTES-en.html
-rw-r--r-- 1 root root    694 2010-04-27 RELEASE-NOTES-en_US
-rw-r--r-- 1 root root   1367 2010-04-27 RELEASE-NOTES-en_US.html
-rw-r--r-- 1 root root    788 2010-04-27 RELEASE-NOTES-es
-rw-r--r-- 1 root root   1619 2010-04-27 RELEASE-NOTES-es.html
-rw-r--r-- 1 root root    852 2010-04-27 RELEASE-NOTES-fr
-rw-r--r-- 1 root root   1641 2010-04-27 RELEASE-NOTES-fr.html
-rw-r--r-- 1 root root    766 2010-04-27 RELEASE-NOTES-ja
-rw-r--r-- 1 root root   1565 2010-04-27 RELEASE-NOTES-ja.html
-rw-r--r-- 1 root root    706 2010-04-27 RELEASE-NOTES-nl
-rw-r--r-- 1 root root   1433 2010-04-27 RELEASE-NOTES-nl.html
-rw-r--r-- 1 root root    752 2010-04-27 RELEASE-NOTES-pt_BR
-rw-r--r-- 1 root root   1480 2010-04-27 RELEASE-NOTES-pt_BR.html
-rw-r--r-- 1 root root    801 2010-04-27 RELEASE-NOTES-ro
-rw-r--r-- 1 root root   1473 2010-04-27 RELEASE-NOTES-ro.html
drwxr-xr-x 2 root root   2048 2010-04-30 repodata
-rw-r--r-- 1 root root   1512 2008-06-15 RPM-GPG-KEY-beta
-rw-r--r-- 1 root root   1504 2008-06-15 RPM-GPG-KEY-CentOS-5
-r--r--r-- 1 root root   7048 2010-04-30 TRANS.TBL