loopback won't unmount?!

[Roger Oberholtzer]

On Thu, 22 May 2003 14:15:26 -0700
"Net Llama!" <netllama at linux-sxs.org> wrote:

> On 05/22/03 14:06, Condon Thomas A KPWA wrote:
> 
> > Net Llama! wrote:
> >> I mounted a ext3 filesystem image on loopback today, and then
> >> chroot'ed into it to make some changes.  when i tried to unmount it,
> >> it refuses with the error:
> >> Device or resource busy
> >> 
> >> If i grep the output from lsof for the file that i had mounted, i get
> >> no results.  What can i do to unmount this besides rebooting the box?
> > 
> > I found you have to cd *out* of the mounted disk in the chroot
> > environment before you can exit and unmount it in the master
> > environment.  If you didn't do that, chroot back in and "cd /".  Then
> > you should be able to unmount it when you exit.  Strange, but it keeps
> > track of *anyone* in that directory structure.
> 
> nope, i did that too.  thanks though.

You have probably unmounted it by now, but you could see if any files are
open on it with:

	lsof +D /mountpoint

Or, you could try:

	ls -l /proc/*/fd | fgrep /mountpoint

That still leaves you with a program having a directory in the file system
as the current directory. 

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