linux-ext4 - Re: [PATCH] ext4:fix invariant checking in ext4_rebalance

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Message-ID: <20070619055605.GA20172@localhost.sw.ru>
Date:	Tue, 19 Jun 2007 09:56:05 +0400
From:	Dmitry Monakhov <dmonakhov@...ru>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Alex Tomas <alex@...sterfs.com>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4:fix invariant checking in ext4_rebalance_reservation

On 12:02 Сбт 16 Июн     , Dmitry Monakhov wrote:
> Variable "free" was declarated as __u64 so conidition (free < 0) always
> false, even if free was overflowed during substraction.
> ---
>  fs/ext4/balloc.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index 43ae8f8..a9655f1 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -1909,8 +1909,8 @@ void ext4_rebalance_reservation(struct ext4_reservation_slot *rs, __u64 free)
>  			chunk = free;
>  		if (rs[i].rs_reserved || i == smp_processor_id()) {
>  			rs[i].rs_reserved = chunk;
> +			BUG_ON(free < chunk);
>  			free -= chunk;
> -			BUG_ON(free < 0);
>  		}
>  	}
>  	BUG_ON(free);
> -- 
> 1.5.2
Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> 
> -
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