Date: Mon, 8 Jun 2009 11:24:49 +0100
From: Jamie Lokier <jamie@shareable.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: viro@ZenIV.linux.org.uk, ebiederm@xmission.com,
       linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
       linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, hugh@veritas.com,
       tj@kernel.org, adobriyan@gmail.com, torvalds@linux-foundation.org,
       alan@lxorguk.ukuu.org.uk, gregkh@suse.de, npiggin@suse.de,
       akpm@linux-foundation.org, hch@infradead.org
Subject: Re: [PATCH 0/23] File descriptor hot-unplug support v2
Message-ID: <20090608102449.GB25684@shareable.org>
References: <m1skkf761y.fsf@fess.ebiederm.org> <m1oct739xu.fsf@fess.ebiederm.org> <20090606080334.GA15204@ZenIV.linux.org.uk> <E1MDbLz-0003wm-Db@pomaz-ex.szeredi.hu>
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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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