On 10/23/2010 05:59 PM, Christoph Hellwig wrote:

quoted text
> The loop driver in current git HEAD is rather unhappy when running
> xfstests.  I gets lots of warnings like the one below.  The most likely
> culprit seems to be:
>
> 	loop: add some basic read-only sysfs attributes
>
> (commit ee86273062cbb310665fe49e1f1937d2cf85b0b9) 
yes, seems I forgot bdev can be NULL in destructor (autoclear mode).
can you try if patch below helps?

Milan

loop: Properly clear sysfs in autoclear mode

Signed-off-by: Milan Broz <mbroz@redhat.com>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6c48b35..c21d4f3 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1049,9 +1049,9 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
 	if (bdev)
 		invalidate_bdev(bdev);
 	set_capacity(lo->lo_disk, 0);
+	loop_sysfs_exit(lo);
 	if (bdev) {
 		bd_set_size(bdev, 0);
-		loop_sysfs_exit(lo);
 		/* let user-space know about this change */
 		kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 	}


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