linux-kernel - Re: [PATCH 0/23] File descriptor hot-unplug support v2

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Message-ID: <20090608102449.GB25684@shareable.org>
Date:	Mon, 8 Jun 2009 11:24:49 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...IV.linux.org.uk, ebiederm@...ssion.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	hugh@...itas.com, tj@...nel.org, adobriyan@...il.com,
	torvalds@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	gregkh@...e.de, npiggin@...e.de, akpm@...ux-foundation.org,
	hch@...radead.org
Subject: Re: [PATCH 0/23] File descriptor hot-unplug support v2

Miklos Szeredi wrote:
> On Sat, 6 Jun 2009, Al Viro wrote:
> > Frankly, I very much suspect that force-umount is another case like that;
> > we'll need a *lot* of interesting cooperation from fs for that to work and
> > to be useful.  I'd be delighted to be proven incorrect on that one, so
> > if you have anything serious in that direction, please share the details.
> 
> Umm, not sure why we'd need cooperation from the fs.  Simply wait for
> the operation to exit the filesystem or driver.  If it's a blocking
> operation, send a signal to interrupt it.

We could even include the internal signal in TASK_KILLABLE, so it
interrupts otherwise uninterruptible operations.

-- Jamie
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