kpartx 命令

今天学到这样一个命令，主要是从之前的loop设备那里看到的
其实这个命令主要来自于处理虚拟机的磁盘镜像，当你想更改一个磁盘镜像里面某些文件的时候，直接挂载会方便很多。
比如我机器刚好有个windowsxp的虚拟机磁盘镜像

[lizhuohua@lizhuohua-phy ~]$ sudo kpartx -av /var/lib/libvirt/images/winxp.img
[sudo] password for lizhuohua:
add map loop0p1 (253:3): 0 30700152 linear /dev/loop0 63
[lizhuohua@lizhuohua-phy ~]$ cd /dev/mapper
[lizhuohua@lizhuohua-phy mapper]$ ls
control  loop0p1  vg_lizhuohua-lv_home  vg_lizhuohua-lv_root  vg_lizhuohua-lv_swap
[lizhuohua@lizhuohua-phy mapper]$ cd /mnt
[lizhuohua@lizhuohua-phy mnt]$ sudo mkdir p
[lizhuohua@lizhuohua-phy mnt]$ sudo mount /dev/mapper/loop0p1 /mnt/p
The disk contains an unclean file system (0, 0).
The file system wasn't safely closed on Windows. Fixing.
[lizhuohua@lizhuohua-phy mnt]$ cd /mnt/p
[lizhuohua@lizhuohua-phy p]$ ls
AUTOEXEC.BAT  boot.ini  CONFIG.SYS  Documents and Settings  econfig  epadm  IO.SYS  MSDOS.SYS  NTDETECT.COM  ntldr  pagefile.sys  Program Files  System Volume Information  WINDOWS
[lizhuohua@lizhuohua-phy p]$ cd ~
[lizhuohua@lizhuohua-phy ~]$ sudo umount /mnt/p
[lizhuohua@lizhuohua-phy ~]$ sudo kpartx -d /var/lib/libvirt/images/winxp.img
loop deleted : /dev/loop0
[lizhuohua@lizhuohua-phy ~]$ cd /dev/mapper
[lizhuohua@lizhuohua-phy mapper]$ ls
control  vg_lizhuohua-lv_home  vg_lizhuohua-lv_root  vg_lizhuohua-lv_swap
[lizhuohua@lizhuohua-phy mapper]$