netdev - Re: [PATCH][RFC] network splice receive v3

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Date:	Wed, 11 Jul 2007 11:17:58 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	olaf.kirch@...cle.com, johnpol@....mipt.ru
Subject: Re: [PATCH][RFC] network splice receive v3

On Wed, Jul 11, 2007 at 11:19:27AM +0200, Jens Axboe wrote:
> Subject: [PATCH] splice: don't assume regular pages in splice_to_pipe()
> 
> Allow caller to pass in a release function, there might be
> other resources that need releasing as well. Needed for
> network receive.
> 
> diff --git a/fs/splice.c b/fs/splice.c
> index 3160951..4b4b501 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -254,11 +254,16 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
>  	}
>  
>  	while (page_nr < spd_pages)
> -		page_cache_release(spd->pages[page_nr++]);
> +		spd->spd_release(spd, page_nr++);

	Rather than requiring the caller set this, shouldn't we just
allow it?  Especially given there is only one non-page user?

  	while (page_nr < spd_pages)
 -		page_cache_release(spd->pages[page_nr++]);
 +		if (spd->spd_release)
 +			spd->spd_release(spd, page_nr++);
 +		else
 +			page_cache_release(spd->pages[page_nr++]);

Joel

-- 

"Any man who is under 30, and is not a liberal, has not heart;
 and any man who is over 30, and is not a conservative, has no brains."
         - Sir Winston Churchill 

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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