linux-kernel - Re: Forced unmounting for removable devices

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Message-ID: <20070831153815.GM21089@ftp.linux.org.uk>
Date:	Fri, 31 Aug 2007 16:38:15 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Eduard-Gabriel Munteanu <maxdamage@...din.ro>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Forced unmounting for removable devices

On Fri, Aug 31, 2007 at 06:35:04PM +0300, Eduard-Gabriel Munteanu wrote:
> *This message was transferred with a trial version of CommuniGate(r) Pro*
> Salah Coronya wrote:
> >There are patches in -mm for revokeat()/frevoke(), which can be used to
> >implement exactly that. If a device "vanishes" (CD is removed in the
> >middle of loading, USB pend rive yanked out the middle of I/O, NFS
> >server thats gone MIA), A user-space program (maybe HAL) could iterate
> >over the open files and revoke() them, at which point the system can be
> >cleanly unmounted.

Bull.  It will not help you at all if a syscall is stuck.

> Sounds promising. Is there any glibc version that implements these 
> syscalls (googling for 'glibc' and 'frevoke' didn't help)? I'd like to 
> implement and test this on my Linux box with HAL.

Implementation that is there in -mm is broken; see discussion on the list.
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