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Subject[PATCH 2/2] new bd_mutex lockdep annotation
Use the gendisk partition number to set a lock class.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Neil Brown <neilb@cse.unsw.edu.au>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Jason Baron <jbaron@redhat.com>
---
fs/block_dev.c | 9 +++++++++
1 file changed, 9 insertions(+)

Index: linux-2.6-mm/fs/block_dev.c
===================================================================
--- linux-2.6-mm.orig/fs/block_dev.c
+++ linux-2.6-mm/fs/block_dev.c
@@ -357,10 +357,14 @@ static int bdev_set(struct inode *inode,

static LIST_HEAD(all_bdevs);

+static struct lock_class_key bdev_part_lock_key;
+
struct block_device *bdget(dev_t dev)
{
struct block_device *bdev;
struct inode *inode;
+ struct gendisk *disk;
+ int part = 0;

inode = iget5_locked(bd_mnt->mnt_sb, hash(dev),
bdev_test, bdev_set, &dev);
@@ -386,6 +390,11 @@ struct block_device *bdget(dev_t dev)
list_add(&bdev->bd_list, &all_bdevs);
spin_unlock(&bdev_lock);
unlock_new_inode(inode);
+ mutex_init(&bdev->bd_mutex);
+ disk = get_gendisk(dev, &part);
+ if (part)
+ lockdep_set_class(&bdev->bd_mutex, &bdev_part_lock_key);
+ put_disk(disk);
}
return bdev;
}
--

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