[ccoss] Re: unmount cdrom, device is busy, what is using it, usingfuser as a solution
- From: dave <dave@xxxxxxxxxx>
- To: ccoss@xxxxxxxxxxxxx
- Date: Fri, 28 Nov 2003 12:58:56 -0500
you can also do this with the lsof (list open files) command:
dave@insp5100:~$ lsof /cdrom
dave@insp5100:~$ cd /cdrom
dave@insp5100:/cdrom$ lsof /cdrom
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
bash 912 dave cwd DIR 11,0 2048 59392 /cdrom
lsof 917 dave cwd DIR 11,0 2048 59392 /cdrom
lsof 918 dave cwd DIR 11,0 2048 59392 /cdrom
dave@insp5100:/cdrom$ umount /cdrom
umount: /cdrom: device is busy
umount: /cdrom: device is busy
dave@insp5100:/cdrom$ cd
dave@insp5100:~$ lsof /cdrom
dave@insp5100:~$ umount /cdrom
dave@insp5100:~$
1st line shows nothing accessing /cdrom
2nd line show me cd'ing into /cdrom
3rd shows that I'm now sitting in that dir
8th shows an attempted umount, unsuccessful
9th shows me cd'ing out
10th shows nothing accessing /cdrom now
11th shows that the umount is now successful.
here's another example that shows xmms playing an mp3 from a mounted cd....
dave@insp5100:~$ lsof /cdrom
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
xmms 963 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
xmms 964 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
xmms 965 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
xmms 968 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
xmms 977 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
xmms 978 dave 10r REG 11,0 6959104 79562 /cdrom/Santana-Love Of
My Life (feat Dave Matthews)-Supernatural.mp3
dave
Christopher Paulin wrote:
> Have you ever tried to unmount the CD-ROM, and it says the device is
> busy. This is a solution to find out what process is using the CD-ROM.
>
> chris@p450:~> cat /etc/fstab
> .....................
> /dev/cdrecorder /media/cdrecorder auto
> ro,noauto,user,exec 0 0
> .....................
> chris@p450:~> ls -l /dev/cdrecorder
> lrwxrwxrwx 1 root root 3 2003-10-13 21:35
> /dev/cdrecorder -> sr0
> chris@p450:~> fuser -m /dev/sr0
> /dev/sr0: 1247
> chris@p450:~> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 1247
>
> /dev/cdrecorder shows the same results as /dev/sr0.
>
> chris@p450:~> ps 1247
> PID TTY STAT TIME COMMAND
> 1247 ? S 2:35 kdeinit: konqueror --silent
> chris@p450:~>
>
> Ah, so it's konqueror that is accessing cdrecorder!
>
> .............tried changing to different directory in konqueror (file
> manager)......................
> chris@p450:~> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 1247
>
> konqueror is still accessing cdrecorder.
>
> ............tried to close konqueror window that was viewing my
> files...........
> chris@p450:~> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 1247
> ..........tried to close all konqueror windows, including Web browsing
> windows..........
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
> chris@p450:~> umount /dev/cdrecorder
> chris@p450:~>
>
> Success!
>
> Hmm, what caused this?
>
> ...............mounted cdrecorder with right-click on KDE desktop icon
> and click on "Mount" option...........
> p450:/home/chris # fuser -m /dev/cdrecorder
> p450:/home/chris #
>
> Nothing accessing cdrecorder yet!
>
> .............opened konqueror............
> p450:/home/chris # fuser -m /dev/cdrecorder
> p450:/home/chris #
> ...........show navigation panel in konqueror (two-pane view)............
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
>
> Nothing accessing cdrecorder yet!
>
> ...........clicked on "file:/media/cdrecorder" in konqueror..........
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
> ...........clicked on "file:/media/cdrecorder/IDE" in konqueror..........
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
>
> Nothing accessing cdrecorder yet!
>
> ...........clicked on "file:/media/cdrecorder/IDE/Readme.txt" in
> konqueror..........
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
> ...............unmounted cdrecorder with right-click on KDE desktop icon
> and click on "Unmount" option...........
>
> Nothing accessing cdrecorder yet, so unmounting was successful.
>
> ...............mounted cdrecorder with right-click on KDE desktop icon
> and click on "Mount" option...........
>
> Hmm, still didn't find what caused this?
>
> chris@p450:~> cd /media/cdrecorder/IDE/
> chris@p450:/media/cdrecorder/IDE> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18082c
> chris@p450:/media/cdrecorder/IDE>
>
> Ah, so this is one way to make cdrecorder busy! Let's make the
> cdrecorder not busy.
>
> In the default display mode, each file name is followed by a letter
> denoting the type of access:
>
> c current directory.
>
> Hence the "c" after the 18082.
>
> chris@p450:/media/cdrecorder/IDE> cd
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
>
> Sucess! The cdrecorder is not busy anymore.
>
> ...............unmounted cdrecorder with right-click on KDE desktop icon
> and click on "Unmount" option...........
>
> Nothing accessing cdrecorder yet, so unmounting was successful.
>
> ...............mounted cdrecorder with right-click on KDE desktop icon
> and click on "Mount" option...........
>
> chris@p450:~> cd /media/cdrecorder/IDE/
> chris@p450:/media/cdrecorder/IDE> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18082c
> chris@p450:/media/cdrecorder/IDE>
>
> cdrecorder is busy again.
>
> chris@p450:/media/cdrecorder/IDE> fuser -k /dev/cdrecorder
>
> -k Kill processes accessing the file.
>
> chris@p450:/media/cdrecorder/IDE> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18082c
> chris@p450:/media/cdrecorder/IDE>
>
> Still there. This didn't kill the konsole window I was in.
>
> The fuser man page says a fuser process never kills itself, so that's
> why the -k option didn't work.
>
> ............using another konsole subshell (#3 instead of
> #4).................
> chris@p450:/mnt/mandrake/home/chris_temp> fuser -k /dev/cdrecorder
> chris@p450:/mnt/mandrake/home/chris_temp> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18082c
> chris@p450:/mnt/mandrake/home/chris_temp>
>
> Still there.
>
> chris@p450:/mnt/mandrake/home/chris_temp> ps 18082
> PID TTY STAT TIME COMMAND
> 18082 pts/0 S 0:00 /bin/bash
> chris@p450:/mnt/mandrake/home/chris_temp>
>
> ...........opened a second konsole window, and using this one.......
>
> chris@p450:~> cd /media/cdrecorder/IDE
> chris@p450:/media/cdrecorder/IDE>
>
> ............back to first konsole window..........
>
> chris@p450:/media/cdrecorder/IDE> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18082c 18234c
>
> Both the first and second konsoles are using cdrecorder.
>
> ............in first konsole window.........
>
> chris@p450:/media/cdrecorder> cd
> chris@p450:~> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18234c
> chris@p450:~> fuser -k /dev/cdrecorder
> chris@p450:~> fuser -m /dev/cdrecorder
> /dev/cdrecorder: 18234c
> chris@p450:~>
>
> fuser didn't kill the second konsole window.
>
> ............back to second konsole window, which was causing cdrecord to
> be busy..........
>
> chris@p450:/media/cdrecorder/IDE> cd
> chris@p450:~>
>
> ............in first konsole window.........
>
> chris@p450:~> fuser -m /dev/cdrecorder
> chris@p450:~>
>
> cdrecorder is not busy because of manually moving out of cdrecorder
> directory in second konsole window.
>
> Christopher Paulin
>
>
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