Messages in this thread Patch in this message | | | Date | Wed, 13 Sep 2006 19:43:14 +0200 | From | Peter Zijlstra <> | Subject | [PATCH 2/2] new bd_mutex lockdep annotation |
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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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