linux-kernel - Re: [rfc patch 3/4] splice: remove confirm from pipe_buf

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Message-Id: <E1KBEA8-0002ey-II@pomaz-ex.szeredi.hu>
Date:	Tue, 24 Jun 2008 21:26:44 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	torvalds@...ux-foundation.org
CC:	miklos@...redi.hu, jens.axboe@...cle.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [rfc patch 3/4] splice: remove confirm from
 pipe_buf_operations

> > > 
> > > Let's start with page_cache_pipe_buf_confirm().  How should we deal
> > > with finding an invalidated page (!PageUptodate(page) &&
> > > !page->mapping)?
> > 
> > I suspect we just have to use it. After all, it was valid when the read 
> > was done. The fact that it got invalidated later is kind of immaterial.
> 
> Right.  But what if it's invalidated *before* becoming uptodate (if
> you'd read my mail further, I discussed this).

Please ignore, this can't happen of course due to page locking...

Miklos
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