Use the gendisk partition number to set a lock class. Signed-off-by: Peter Zijlstra Cc: Neil Brown Cc: Ingo Molnar Cc: Arjan van de Ven Cc: Andrew Morton Cc: Jason Baron --- 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; } -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/