Re: Solve the problem that umount will fail when an opened file isn't closed

["colin" <colin@realtek.com.tw>]

Hi Jan,
I found that if the process doesn't close the file after usb disk is
unplugged, generic_shutdown_super won't be invoked.
generic_shutdown_super will be invoked right after all opened files are
closed.

Regards,
Colin


----- Original Message ----- 
From: "Jan Engelhardt" <jengelh@linux01.gwdg.de>
To: "colin" <colin@realtek.com.tw>
Cc: <linux-kernel@vger.kernel.org>
Sent: Friday, June 16, 2006 11:34 PM
Subject: Re: Solve the problem that umount will fail when an opened file
isn't closed


> >
> >Hi all,
> >I have implemented an auto-mount & auto-umount facility based on USB
> >hotplug.
> >An annoying problem will occur when some process doesn't close its open
file
> >and auto-umount is trying to umount that mount point after usb disk has
been
> >unplugged.
> >Is there any way to force it to be umounted in this situation?
> >
>
> fs/super.c:
>
>     /* Forget any remaining inodes */
>     if (invalidate_inodes(sb)) {
>         printk("VFS: Busy inodes after unmount of %s. "
>            "Self-destruct in 5 seconds.  Have a nice day...\n",
>            sb->s_id);
>     }
>
> That's what happens if you eject a CD. The box won't explode though.
>
>
> Jan Engelhardt
> --