linux-kernel - Re: [PATCH] fs/splice: Pull buf->ops->confirm() from splice_from

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Message-ID: <20101213150450.GA12865@rere.qmqm.pl>
Date:	Mon, 13 Dec 2010 16:04:50 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH] fs/splice: Pull buf->ops->confirm() from
	splice_from_pipe actors

On Mon, Dec 13, 2010 at 02:38:19PM +0100, Jens Axboe wrote:
> On 2010-12-12 22:23, Michał Mirosław wrote:
> > This patch pulls calls to buf->ops->confirm() from all actors passed
> > (also indirectly) to splice_from_pipe_feed().
> Why? The point of ->confirm() is to ensure that the contents are
> stable, otherwise the pages in the pipe could merely be in flight.
> It's needed if you need to actually look at the data, rather than just
> reference it.

I should have put this more clearly in the patch description:
the ->confirm() call is moved to splice_from_pipe_feed(), so that every
actor has its data guaranteed to be stable before it runs.

Best Regards,
Michał Mirosław
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