linux-kernel - Re: [PATCH 2/2 v2] udf : add readpages support for udf.

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Date:	Thu, 6 Oct 2011 00:14:42 +0200
From:	Jan Kara <jack@...e.cz>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	jack@...e.cz, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2 v2] udf : add readpages support for udf.

On Mon 03-10-11 14:02:59, Namjae Jeon wrote:
> Using mpage_readpages instead of multiple calls to udf_readpage to reduce the CPU utilization and make performance higher.
  Thanks. I've merged this patch.

									Honza
> 
> Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
> ---
>  fs/udf/inode.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/udf/inode.c b/fs/udf/inode.c
> index 58665ce..81f9ce1 100644
> --- a/fs/udf/inode.c
> +++ b/fs/udf/inode.c
> @@ -37,6 +37,7 @@
>  #include <linux/writeback.h>
>  #include <linux/slab.h>
>  #include <linux/crc-itu-t.h>
> +#include <linux/mpage.h>
>  
>  #include "udf_i.h"
>  #include "udf_sb.h"
> @@ -104,7 +105,13 @@ static int udf_writepage(struct page *page, struct writeback_control *wbc)
>  
>  static int udf_readpage(struct file *file, struct page *page)
>  {
> -	return block_read_full_page(page, udf_get_block);
> +	return mpage_readpage(page, udf_get_block);
> +}
> +
> +static int udf_readpages(struct file *file, struct address_space *mapping,
> +			struct list_head *pages, unsigned nr_pages)
> +{
> +	return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
>  }
>  
>  static int udf_write_begin(struct file *file, struct address_space *mapping,
> @@ -139,6 +146,7 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
>  
>  const struct address_space_operations udf_aops = {
>  	.readpage	= udf_readpage,
> +	.readpages	= udf_readpages,
>  	.writepage	= udf_writepage,
>  	.write_begin		= udf_write_begin,
>  	.write_end		= generic_write_end,
> -- 
> 1.7.4.4
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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