diff --git a/[refs] b/[refs]
index 001e79044bcf..48ffcd6ff892 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3ec706c831d4c96905c287013c8228b21619a1d9
+refs/heads/master: a8a6dab77997a371f1925a4001021eea3ee5cb88
diff --git a/trunk/fs/btrfs/volumes.c b/trunk/fs/btrfs/volumes.c
index 96bb2e4446aa..6cd8a32c4484 100644
--- a/trunk/fs/btrfs/volumes.c
+++ b/trunk/fs/btrfs/volumes.c
@@ -5106,3 +5106,21 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
 		stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX;
 	return 0;
 }
+
+int btrfs_scratch_superblock(struct btrfs_device *device)
+{
+	struct buffer_head *bh;
+	struct btrfs_super_block *disk_super;
+
+	bh = btrfs_read_dev_super(device->bdev);
+	if (!bh)
+		return -EINVAL;
+	disk_super = (struct btrfs_super_block *)bh->b_data;
+
+	memset(&disk_super->magic, 0, sizeof(disk_super->magic));
+	set_buffer_dirty(bh);
+	sync_dirty_buffer(bh);
+	brelse(bh);
+
+	return 0;
+}
diff --git a/trunk/fs/btrfs/volumes.h b/trunk/fs/btrfs/volumes.h
index ad5566d4f2c8..7eaaf4e61959 100644
--- a/trunk/fs/btrfs/volumes.h
+++ b/trunk/fs/btrfs/volumes.h
@@ -301,6 +301,7 @@ int btrfs_get_dev_stats(struct btrfs_root *root,
 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
 			struct btrfs_fs_info *fs_info);
+int btrfs_scratch_superblock(struct btrfs_device *device);
 
 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
 				      int index)