linux-ext4 - Re: [PATCH] ext3: Check return value of sb

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Date:	Tue, 19 Oct 2010 16:57:29 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext3: Check return value of sb_getblk()

2010-10-19 (화), 15:34 +0900, Namhyung Kim:
> Check return value of sb_getblk() is NULL. unlikely is addded here
> since it is called from a loop and we've been OK without the check
> until now.
> 
> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> ---
>  fs/ext3/inode.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
> index ef1c23a..a7ac778 100644
> --- a/fs/ext3/inode.c
> +++ b/fs/ext3/inode.c
> @@ -655,6 +655,12 @@ static int ext3_alloc_branch(handle_t *handle, struct inode *inode,
>  		 * parent to disk.
>  		 */
>  		bh = sb_getblk(inode->i_sb, new_blocks[n-1]);
> +		if (unlikely(!bh)) {
> +			n--;
> +			err = -ENOMEM;
> +			goto failed;
> +		}
> +
>  		branch[n].bh = bh;
>  		lock_buffer(bh);
>  		BUFFER_TRACE(bh, "call get_create_access");

Maybe EIO would be more proper error code, I guess.


-- 
Regards,
Namhyung Kim


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