2 files changed, 19 insertions, 0 deletions

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 96bb2e4446aa..6cd8a32c4484 100644
--- a/fs/btrfs/volumes.c
+++ b/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/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index ad5566d4f2c8..7eaaf4e61959 100644
--- a/fs/btrfs/volumes.h
+++ b/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)