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

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Date:	Tue, 24 Jun 2008 12:17:44 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
cc:	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



On Tue, 24 Jun 2008, Miklos Szeredi wrote:
> 
> 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.

splice() is an optimized read+write. The read reads it into a temporary 
buffer. The fact that it's a zero-copy buffer and basically just re-uses 
the source doesn't really change that.

		Linus
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