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