linux-ext4 - Re: [PATCH 2/5] ext4: Use redirty_page_for_writepage() in ext4_bio_write

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Date:	Fri, 4 Jan 2013 15:20:33 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/5] ext4: Use redirty_page_for_writepage() in
 ext4_bio_write_page()

On Wed, Jan 02, 2013 at 06:45:41PM +0100, Jan Kara wrote:
> When we cannot write a page we should use redirty_page_for_writepage()
> instead of plain set_page_dirty(). That tells writeback code we have
> problems, redirties only the page (redirtying buffers is not needed),
> and updates mm accounting of failed page writes.
> 
> Also move clearing of buffer dirty flag after io_submit_add_bh(). At that
> moment we are sure buffer will be going to disk.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
Regards,
                                                - Zheng

> ---
>  fs/ext4/page-io.c |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
> index 0016fbc..8e5722a 100644
> --- a/fs/ext4/page-io.c
> +++ b/fs/ext4/page-io.c
> @@ -23,6 +23,7 @@
>  #include <linux/workqueue.h>
>  #include <linux/kernel.h>
>  #include <linux/slab.h>
> +#include <linux/mm.h>
>  
>  #include "ext4_jbd2.h"
>  #include "xattr.h"
> @@ -436,7 +437,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
>  
>  	io_page = kmem_cache_alloc(io_page_cachep, GFP_NOFS);
>  	if (!io_page) {
> -		set_page_dirty(page);
> +		redirty_page_for_writepage(wbc, page);
>  		unlock_page(page);
>  		return -ENOMEM;
>  	}
> @@ -468,7 +469,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
>  			set_buffer_uptodate(bh);
>  			continue;
>  		}
> -		clear_buffer_dirty(bh);
>  		ret = io_submit_add_bh(io, io_page, inode, wbc, bh);
>  		if (ret) {
>  			/*
> @@ -476,9 +476,10 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
>  			 * we can do but mark the page as dirty, and
>  			 * better luck next time.
>  			 */
> -			set_page_dirty(page);
> +			redirty_page_for_writepage(wbc, page);
>  			break;
>  		}
> +		clear_buffer_dirty(bh);
>  	}
>  	unlock_page(page);
>  	/*
> -- 
> 1.7.1
> 
> --
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