Démonter un point de montage sous Linux

Cependant, si le point de montage est utilisé, vous aurez le message d'erreur device is busy

Sur https://forum.ubuntu-fr.org/viewtopic.php?id=61773 on apprend que l'on peut utiliser la commande fuser -kimuv $MOINT_POINT

avec

-k : kill processes accessing the named file
-i : ask before killing (ignored without -k)
-m : show all processes using the named filesystems
-u : display user IDs
-v : verbose output

 

Commentez la ligne à exclure en plaçant un # devant

 

http://oletange.blogspot.com/2012/04/umount-device-is-busy-why.html donne une liste d'autres possibilités :

Working directory or (possibly deleted) file open of a running process

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					# lsof /mnt/test/
					COMMAND   PID  USER   FD   TYPE DEVICE SIZE/OFF  NODE NAME
					bash    10934 tange  cwd    DIR    7,0     4096 65537 /mnt/test/testdir
					cat     14286 tange    1w   REG    7,0        0 65538 /mnt/test/testdir/a
					cat     14291 tange    1w   REG    7,0        2 65539 /mnt/test/testdir/b (deleted)
					# kill -9 10934 14286 14291
					# lsof /mnt/test/
					# umount /mnt/test

Open (possibly deleted) socket

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					# lsof -a | grep /mnt/test/
					tmux  14378  tange  6u  unix 0xacf703c0  0t0  656531 /mnt/test/tmux-1000/default type=STREAM
					# kill 14378
					# lsof -a | grep /mnt/test/ 
					# umount /mnt/test
					

nfs-kernel-server is exporting the directory (and the directory is mounted by a client)

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					# showmount -e
					Export list for alpha:
					/mnt/test 192.168.1.203
					# /etc/init.d/nfs-kernel-server stop
					# umount /mnt/test
					

A loopback device backing file exists in the dir

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					# losetup -a
					/dev/loop0: [0851]:6983 (/mnt/test/testdir/disk.img)
					/dev/loop1: [0851]:6986 (/mnt/test/testdir/disk2.img)
					# umount /mnt/test/testdir/disk.img
					# umount /mnt/test/testdir/disk2.img
					umount: /mnt/test/testdir/disk2.img: not mounted
					# losetup -d /dev/loop1
					# umount /mnt/test
					

A swapfile exists in the dir

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					# cat /proc/swaps
					Filename                                Type            Size    Used    Priority
					/mnt/test/testdir/swapfile              file            95480   0       -2
					# swapoff /mnt/test/testdir/swapfile
					# umount /mnt/test

The device failed

					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1)) 

					# dmesg

					:

					[75620.618404] lost page write due to I/O error on md0
					[75620.618408] Buffer I/O error on device md0, logical block 16804
					:

					[75890.015507] INFO: task cp:27736 blocked for more than 120 seconds.
					[75890.015513] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
					[75890.015516] cp              D ffff88053fdd39c0     0 27736  27734 0x00000004
					## Here I have not found a solution, so:
					# umount -l /mnt/test

The dir contains an umounted encfs

					normaluser$ encfs /mnt/test/dir.enc /mnt/test/dir
					EncFS Password:
					# umount /mnt/test/dir
					# umount /mnt/test
					umount: /mnt/test: device is busy.
					        (In some cases useful info about processes that use
					         the device is found by lsof(8) or fuser(1))
					## Here I have not found a solution, so:
					# umount -l /mnt/test