umount device busy

[David Whytcross]

Hi Gary,

if you are using xfce4, then you have most likely got gamin running as well, 
this caused the same problem for me when trying to umount an external USB 
drive

I resolved my umount problem by including the -f switch

#umount -f /mnt/goflex


Dave Whytcross



----- Original Message ----- 
From: "Gary Aitken" <freebsd at dreamchaser.org>
To: "FreeBSD Mailing List" <freebsd-questions at freebsd.org>
Sent: Monday, June 04, 2012 12:59 AM
Subject: umount device busy


> Something I'm overlooking here and a lot of questions I can't seem to find 
> the answers to...
>
> I mounted a usb drive
>  mount -t ntfs /dev/da0s1 /mnt/goflex
>
> Then, as nearly as I can remember...
>  I then poked around a bit using the xfce4 browser.
>  I tried to mkdir from the mount point as a normal user:
>    cd /mnt/goflex
>    %mkdir breakaway
>    mkdir: .: No such file or directory
>  After checking write premissions, which I didn't have,
>  I did an su -l and tried again, with the same results.
>
> I then tried to unmount the drive, believing it was mounted read-only:
>    #umount /mnt/goflex
>    umount: unmount of /mnt/goflex failed: Device busy
>
> As nearly as I can tell, I don't have anything pointing at that drive.
>
> Questions:
>
> 1.  What does the "No such file or directory" mean from mkdir?
>    It's a relative dir name, and I'm sitting at a valid dir.
>
> 2.  How do I find out how the file-system was mounted?
>    mount (noargs) does not show read/write status
>
> 3.  I tried lsof but I don't get any output from it:
>      lsof +d /mnt/goflex -x -- /mnt/goflex
>    Where does it go if not to stdout?
>
> 4.  lsof has a *long* man page, so I'd like to save it temporarily so I 
> can search it in an editor.  If I do man lsof >temp.tmp the output 
> contains backspace sequences which screw up searching.  How do I get man 
> to produce plain text without the control sequences?
>
> 5.  The lsof man page references a faq which is supposed to be part of the 
> distribution.
>    find . -ls | grep lsof doesn't show any faq.
>
> 6.  And finally, any idea why umount says the device is busy?
>
> Seems like I should have been able to find the answer to at least one of 
> those but I'm coming up short.
>
> Thanks for relevant pointers,
>
> Gary
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