linux-kernel - [PATCH] block_dev.c mutex_lock

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Message-ID: <Pine.LNX.4.64.0608231104220.5899@dhcp83-20.boston.redhat.com>
Date:	Wed, 23 Aug 2006 11:09:35 -0400 (EDT)
From:	Jason Baron <jbaron@...hat.com>
To:	neilb@...e.de
cc:	akpm@...l.org, arjan@...radead.org, mingo@...hat.com,
	axboe@...e.de, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org
Subject: [PATCH] block_dev.c mutex_lock_nested() fix


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.

thanks,

-Jason

Signed-off-by: Jason Baron <jbaron@...hat.com>

--- 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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