Re: umount question

From: Mike Wooding (timmywooding_at_yahoo.com)
Date: 03/30/05

  • Next message: Marty Landman: "Re: umount question" 
    Date: Wed, 30 Mar 2005 13:26:07 -0800 (PST)
To: General Red Hat Linux discussion list <redhat-list@redhat.com>

    --- Marty Landman <MLandman@face2interface.com> wrote:
    > How do I get this cd unmounted?
    >
    > --------------------------------------------------------------------
    >
    > [root@penguin RPMS]# umount /mnt/cdrom
    > umount: /mnt/cdrom: device is busy
    > [root@penguin RPMS]# /sbin/fuser -m /mnt/cdrom
    > /mnt/cdrom: 19774c 19924c
    > [root@penguin RPMS]# umount /mnt/cdrom
    > umount: /mnt/cdrom: device is busy
    > [root@penguin RPMS]# /sbin/fuser -k /mnt/cdrom/19774c
    > /mnt/cdrom/19774c: No such file or directory
    > [root@penguin RPMS]# /sbin/fuser -k /mnt/cdrom/19924c
    > /mnt/cdrom/19924c: No such file or directory
    > [root@penguin RPMS]# umount /mnt/cdrom
    > umount: /mnt/cdrom: device is busy

     If someone (sh?) has cwd set to somewhere in the /mnt/cdrom
     fs, (e.g. cd /mnt/cdrom) that will make the mounted fs busy.
     This can seomtimes be subtle to discover. E.g. if you have
     a shell and do a cd /mnt/cdrom, the "su" so you can do rooty
     stuff and then cd / and try and umount, the device will still
     be busy, because the process you left when you su'd is still
     cwd to /mnt/cdrom. Did I make that sufficiently confusing?

    He who laughs last thinks slowest.

                    
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