linux-ext4 - Re: [PATCH] ext4: add error processing when calling ext4_mb_init

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Date:	Wed, 28 May 2008 15:24:20 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Shen Feng <shen@...fujitsu.com>, Mingming Cao <cmm@...ibm.com>
Cc:	alex@...sterfs.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: add error processing when calling
	ext4_mb_init_cache in mballoc

On Wed, May 28, 2008 at 05:40:20PM +0800, Shen Feng wrote:
> Add error processing for ext4_mb_load_buddy when it calls
> ext4_mb_init_cache.
> 
> Signed-off-by: Shen Feng <shen@...fujitsu.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

> ---
>  fs/ext4/mballoc.c |   27 ++++++++++++++++++++-------
>  1 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 35c12db..a30a35d 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -883,6 +883,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
>  	int pnum;
>  	int poff;
>  	struct page *page;
> +	int ret;
> 
>  	mb_debug("load group %lu\n", group);
> 
> @@ -914,15 +915,21 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
>  		if (page) {
>  			BUG_ON(page->mapping != inode->i_mapping);
>  			if (!PageUptodate(page)) {
> -				ext4_mb_init_cache(page, NULL);
> +				ret = ext4_mb_init_cache(page, NULL);
> +				if (ret) {
> +					unlock_page(page);
> +					goto err;
> +				}
>  				mb_cmp_bitmaps(e4b, page_address(page) +
>  					       (poff * sb->s_blocksize));
>  			}
>  			unlock_page(page);
>  		}
>  	}
> -	if (page == NULL || !PageUptodate(page))
> +	if (page == NULL || !PageUptodate(page)) {
> +		ret = -EIO;
>  		goto err;
> +	}
>  	e4b->bd_bitmap_page = page;
>  	e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
>  	mark_page_accessed(page);
> @@ -938,14 +945,20 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
>  		page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
>  		if (page) {
>  			BUG_ON(page->mapping != inode->i_mapping);
> -			if (!PageUptodate(page))
> -				ext4_mb_init_cache(page, e4b->bd_bitmap);
> -
> +			if (!PageUptodate(page)) {
> +				ret = ext4_mb_init_cache(page, e4b->bd_bitmap);
> +				if (ret) {
> +					unlock_page(page);
> +					goto err;
> +				}
> +			}
>  			unlock_page(page);
>  		}
>  	}
> -	if (page == NULL || !PageUptodate(page))
> +	if (page == NULL || !PageUptodate(page)) {
> +		ret = -EIO;
>  		goto err;
> +	}
>  	e4b->bd_buddy_page = page;
>  	e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize);
>  	mark_page_accessed(page);
> @@ -962,7 +975,7 @@ err:
>  		page_cache_release(e4b->bd_buddy_page);
>  	e4b->bd_buddy = NULL;
>  	e4b->bd_bitmap = NULL;
> -	return -EIO;
> +	return ret;
>  }
> 
>  static void ext4_mb_release_desc(struct ext4_buddy *e4b)
> -- 
> 1.5.4.5
> --
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