linux中的设备类型

loop设备

loop设备

一。参考命令
[root@localhost a]# losetup 
usage:
  losetup loop_device                                       # give info
  losetup -d loop_device                                    # delete
  losetup -f                                                # find unused
  losetup -a                                                # list all used
  losetup -r                                                # read-only loop
  losetup [-e encryption] [-o offset] [-r] {-f|loop_device} file # setup
[root@localhost a]#

二。loop挂载
2.1挂载到空闲的loop设备上
[root@localhost a]# losetup -f  -o $[208845*512] /lvm/vm/vm41.img
2.2挂载到指定的loop设备上
[root@localhost a]# losetup /dev/loop4  -o $[208845*512] /lvm/vm/vm41.img
2.3查看所有使用中的loop设备
[root@localhost a]# losetup -a
/dev/loop0: [fd00]:327683 (/lvm/vm/vm42.img), offset 106928640
/dev/loop4: [fd00]:327682 (/lvm/vm/vm41.img), offset 106928640

三。loop删除
losetup -a
losetup -d /dev/loop1