linux-kernel - Re: [Cluster-devel] [PATCH v3 08/18] gfs2: use ->invalidatepage() length argument

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Message-ID: <1365499773.2708.5.camel@menhir>
Date:	Tue, 09 Apr 2013 10:29:33 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	cluster-devel@...hat.com
Subject: Re: [Cluster-devel] [PATCH v3 08/18] gfs2: use ->invalidatepage()
 length argument

Hi,

On Tue, 2013-04-09 at 11:14 +0200, Lukas Czerner wrote:
> ->invalidatepage() aop now accepts range to invalidate so we can make
> use of it in gfs2_invalidatepage().
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> Cc: cluster-devel@...hat.com
Acked-by: Steven Whitehouse <swhiteho@...hat.com>

Steve.

> ---
>  fs/gfs2/aops.c |    9 +++++++--
>  1 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
> index 37093ba..ea920bf 100644
> --- a/fs/gfs2/aops.c
> +++ b/fs/gfs2/aops.c
> @@ -947,24 +947,29 @@ static void gfs2_invalidatepage(struct page *page, unsigned int offset,
>  				unsigned int length)
>  {
>  	struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
> +	unsigned int stop = offset + length;
> +	int partial_page = (offset || length < PAGE_CACHE_SIZE);
>  	struct buffer_head *bh, *head;
>  	unsigned long pos = 0;
>  
>  	BUG_ON(!PageLocked(page));
> -	if (offset == 0)
> +	if (!partial_page)
>  		ClearPageChecked(page);
>  	if (!page_has_buffers(page))
>  		goto out;
>  
>  	bh = head = page_buffers(page);
>  	do {
> +		if (pos + bh->b_size > stop)
> +			return;
> +
>  		if (offset <= pos)
>  			gfs2_discard(sdp, bh);
>  		pos += bh->b_size;
>  		bh = bh->b_this_page;
>  	} while (bh != head);
>  out:
> -	if (offset == 0)
> +	if (!partial_page)
>  		try_to_release_page(page, 0);
>  }
>  


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