linux-kernel - Re: [PATCH 4/6] ext2 balloc: fix off-by-one against grp

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Message-Id: <1164756632.6538.4.camel@dyn9047017103.beaverton.ibm.com>
Date:	Tue, 28 Nov 2006 15:30:32 -0800
From:	Mingming Cao <cmm@...ibm.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Andrew Morton <akpm@...l.org>, Mel Gorman <mel@...net.ie>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 4/6] ext2 balloc: fix off-by-one against grp_goal

On Tue, 2006-11-28 at 17:42 +0000, Hugh Dickins wrote:
> grp_goal 0 is a genuine goal (unlike -1),
> so ext2_try_to_allocate_with_rsv should treat it as such.
> 
> Signed-off-by: Hugh Dickins <hugh@...itas.com>

Acked.

Thanks,

Mingming
> ---
> 
>  fs/ext2/balloc.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- 2.6.19-rc6-mm2/fs/ext2/balloc.c	2006-11-24 08:18:02.000000000 +0000
> +++ linux/fs/ext2/balloc.c	2006-11-27 19:28:41.000000000 +0000
> @@ -1053,7 +1053,7 @@ ext2_try_to_allocate_with_rsv(struct sup
>  	}
>  	/*
>  	 * grp_goal is a group relative block number (if there is a goal)
> -	 * 0 < grp_goal < EXT2_BLOCKS_PER_GROUP(sb)
> +	 * 0 <= grp_goal < EXT2_BLOCKS_PER_GROUP(sb)
>  	 * first block is a filesystem wide block number
>  	 * first block is the block number of the first block in this group
>  	 */
> @@ -1089,7 +1089,7 @@ ext2_try_to_allocate_with_rsv(struct sup
>  			if (!goal_in_my_reservation(&my_rsv->rsv_window,
>  							grp_goal, group, sb))
>  				grp_goal = -1;
> -		} else if (grp_goal > 0) {
> +		} else if (grp_goal >= 0) {
>  			int curr = my_rsv->rsv_end -
>  					(grp_goal + group_first_block) + 1;
> 

-
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