【Linux工具】losetup: /dev/loop0: failed to set up loop device: Device or resource busy解决办法
文章目录
- 1 问题现象
- 2 解决办法
-
- 2.1 使用命令 `sudo losetup -f` 自动查找空闲的设备
- 2.2 重新设置到找出的空闲设备上
- 2.3 后续研究一下设备被占用的原因
- 3 参考资料
1 问题现象
如题， 详细错误如下：尝试了几个loop位置， 都失败了，错误信息都是 failed to set up loop device: Device or resource busy :
neo@neo-hw-matebookxpro:~/neo-practice/neos/lesson10
$ sudo losetup /dev/loop0 hd.img
losetup: hd.img: failed to set up loop device: Device or resource busy
neo@neo-hw-matebookxpro:~/neo-practice/neos/lesson10
$ sudo losetup /dev/loop8 hd.img
losetup: hd.img: failed to set up loop device: Device or resource busy
neo@neo-hw-matebookxpro:~/neo-practice/neos/lesson10
$ sudo losetup /dev/loop7 hd.img
losetup: hd.img: failed to set up loop device: Device or resource busy
查看了一下， loop设备编号挺多的呀：
$ ll /dev/loop*
brw-rw---- 1 root disk 7, 0 Nov 12 23:56 /dev/loop0
brw-rw---- 1 root disk 7, 1 Oct 31 23:06 /dev/loop1
brw-rw---- 1 root disk 7, 10 Sep 9 00:08 /dev/loop10
brw-rw---- 1 root disk 7, 11 Oct 25 22:03 /dev/loop11
brw-rw---- 1 root disk 7, 12 Oct 25 22:03 /dev/loop12
brw-rw---- 1 root disk 7, 13 Oct 25 22:03 /dev/loop13
brw-rw---- 1 root disk 7, 14 Sep 9 00:08 /dev/loop14
brw-rw---- 1 root disk 7, 15 Sep 9 00:08 /dev/loop15
brw-rw---- 1 root disk 7, 16 Oct 31 23:06 /dev/loop16
brw-rw---- 1 root disk 7, 17 Oct 31 23:06 /dev/loop17
brw-rw---- 1 root disk 7, 18 Oct 31 23:06 /dev/loop18
brw-rw---- 1 root disk 7, 19 Oct 31 23:06 /dev/loop19
brw-rw---- 1 root disk 7, 2 Sep 9 00:08 /dev/loop2
brw-rw---- 1 root disk 7, 3 Sep 9 00:08 /dev/loop3
brw-rw---- 1 root disk 7, 4 Oct 25 22:03 /dev/loop4
brw-rw---- 1 root disk 7, 5 Sep 9 00:08 /dev/loop5
brw-rw---- 1 root disk 7, 6 Oct 24 22:33 /dev/loop6
brw-rw---- 1 root disk 7, 7 Nov 12 23:59 /dev/loop7
brw-rw---- 1 root disk 7, 8 Nov 12 23:59 /dev/loop8
brw-rw---- 1 root disk 7, 9 Oct 31 23:06 /dev/loop9
crw-rw---- 1 root disk 10, 237 Sep 9 00:08 /dev/loop-control
2 解决办法
2.1 使用命令 sudo losetup -f 自动查找空闲的设备
- 原理说明， 使用命令
sudo losetup -f自动查找空闲的设备loop16， 如下：
$ sudo losetup -f
/dev/loop16
2.2 重新设置到找出的空闲设备上
- 这次很顺利， 没有报错， 执行成功了；
neo@neo-hw-matebookxpro:~/neo-practice/neos/lesson10
$ sudo losetup /dev/loop16 hd.img
neo@neo-hw-matebookxpro:~/neo-practice/neos/lesson10
2.3 后续研究一下设备被占用的原因
- todo
3 参考资料
losetup使用帮助：
$ losetup --help
Usage:
losetup [options] [<loopdev>]
losetup [options] -f | <loopdev> <file>
Set up and control loop devices.
Options:
-a, --all list all used devices
-d, --detach <loopdev>... detach one or more devices
-D, --detach-all detach all used devices
-f, --find find first unused device
-c, --set-capacity <loopdev> resize the device
-j, --associated <file> list all devices associated with <file>
-L, --nooverlap avoid possible conflict between devices
-o, --offset <num> start at offset <num> into file
--sizelimit <num> device is limited to <num> bytes of the file
-b, --sector-size <num> set the logical sector size to <num>
-P, --partscan create a partitioned loop device
-r, --read-only set up a read-only loop device
--direct-io[=<on|off>] open backing file with O_DIRECT
--show print device name after setup (with -f)
-v, --verbose verbose mode
-J, --json use JSON --list output format
-l, --list list info about all or specified (default)
-n, --noheadings don't print headings for --list output
-O, --output <cols> specify columns to output for --list
--output-all output all columns
--raw use raw --list output format
-h, --help display this help
-V, --version display version
Available output columns:
NAME loop device name
AUTOCLEAR autoclear flag set
BACK-FILE device backing file
BACK-INO backing file inode number
BACK-MAJ:MIN backing file major:minor device number
MAJ:MIN loop device major:minor number
OFFSET offset from the beginning
PARTSCAN partscan flag set
RO read-only device
SIZELIMIT size limit of the file in bytes
DIO access backing file with direct-io
LOG-SEC logical sector size in bytes
For more details see losetup(8).
- losetup: /dev/loop0: failed to set up loop device: No such file or directory错误及原因解决