linux-kernel - Re: [PATCH] block_dev.c mutex_lock

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Date:	Wed, 23 Aug 2006 18:48:57 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jason Baron <jbaron@...hat.com>
Cc:	neilb@...e.de, akpm@...l.org, arjan@...radead.org,
	mingo@...hat.com, axboe@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block_dev.c mutex_lock_nested() fix

On Wed, 2006-08-23 at 11:09 -0400, Jason Baron wrote:
> Hi,
> 
> In the case below we are locking the whole disk not a partition. This 
> change simply brings the code in line with the piece above where when we 
> are the 'first' opener, and we are a partition.

Makes sense in that only whole devices have a partition count.

> Signed-off-by: Jason Baron <jbaron@...hat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

> --- linux-2.6/fs/block_dev.c.bak
> +++ linux-2.6/fs/block_dev.c
> @@ -966,7 +966,7 @@ do_open(struct block_device *bdev, struc
>  				rescan_partitions(bdev->bd_disk, bdev);
>  		} else {
>  			mutex_lock_nested(&bdev->bd_contains->bd_mutex,
> -					  BD_MUTEX_PARTITION);
> +					  BD_MUTEX_WHOLE);
>  			bdev->bd_contains->bd_part_count++;
>  			mutex_unlock(&bdev->bd_contains->bd_mutex);
>  		}

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