diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a227e94b9e88..39b117a57a54 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -160,7 +160,6 @@ static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh,
 	int ret;
 	struct btrfs_node *node;
 
-	return 0;
 	ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
 			      bh->b_size - BTRFS_CSUM_SIZE, result);
 	if (ret)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d785b721b461..cd40a08dd8a6 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -249,8 +249,6 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
 		btrfs_set_super_blocks_used(info->disk_super,
 					    super_blocks_used - num_blocks);
 		ret = btrfs_del_item(trans, extent_root, path);
-		if (extent_root->fs_info->last_insert.objectid > blocknr)
-			extent_root->fs_info->last_insert.objectid = blocknr;
 		if (ret)
 			BUG();
 	}
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index e7510ac5559d..2c98b620c594 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -110,6 +110,7 @@ int btrfs_csum_verify_file_block(struct btrfs_root *root,
 	file_key.offset = offset;
 	file_key.flags = 0;
 	btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
+	mutex_lock(&root->fs_info->fs_mutex);
 	ret = btrfs_search_slot(NULL, root, &file_key, path, 0, 0);
 	if (ret)
 		goto fail;
@@ -123,6 +124,7 @@ int btrfs_csum_verify_file_block(struct btrfs_root *root,
 fail:
 	btrfs_release_path(root, path);
 	btrfs_free_path(path);
+	mutex_unlock(&root->fs_info->fs_mutex);
 	return ret;
 }
 
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 9fd87f5edbc9..fbc26eafc58c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1316,7 +1316,6 @@ static void btrfs_destroy_inode(struct inode *inode)
 	WARN_ON(ei->magic != 0xDEADBEEF);
 	WARN_ON(ei->magic2 != 0xDEADBEAF);
 	WARN_ON(!list_empty(&inode->i_dentry));
-	WARN_ON(inode->i_ino == 1);
 	WARN_ON(inode->i_data.nrpages);
 
 	ei->magic = 0;