linux-kernel - Re: [patch v3] splice: fix race with page invalidation

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Date:	Thu, 31 Jul 2008 09:30:11 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	jamie@...reable.org
CC:	miklos@...redi.hu, torvalds@...ux-foundation.org,
	jens.axboe@...cle.com, akpm@...ux-foundation.org,
	nickpiggin@...oo.com.au, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch v3] splice: fix race with page invalidation

On Thu, 31 Jul 2008, Jamie Lokier wrote:
> I'm more concerned by sendfile() users like Apache, Samba, FTPd.  In
> an earlier thread on this topic, I asked if the splice bug can also
> result in sendfile() sending blocks of zeros, when a file is truncated
> after it has been sent, and the answer was yes probably.
> 
> Not that I checked or anything.  But if it affects sendfile() it's a
> bigger deal - that has many users.

Nick also pointed out, that it also affects plain read(2), albeit only
with a tiny window.

But partial truncates are _rare_ (we don't even have a UNIX utility
for that ;), so in practice all this may not actually matter very
much.

Miklos
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