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

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Message-ID: <20090608162913.GL8633@ZenIV.linux.org.uk>
Date:	Mon, 8 Jun 2009 17:29:13 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	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

On Mon, Jun 08, 2009 at 11:41:19AM +0200, 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.

And making sure that operations *are* interruptible (and that we can cope
with $BIGNUM new failure exits correctly) does not qualify as cooperation?
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