btrfs-progs: handle errors from btrfs_alloc_path

All functions already return an error condition, so the callers should
expect that.

Signed-off-by: David Sterba <dsterba@suse.com>

ctree.c

@@ -2580,7 +2580,9 @@ int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
 	unsigned long ptr;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
+
 	ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
 	if (!ret) {
 		leaf = path->nodes[0];

disk-io.c

@@ -739,7 +739,11 @@ struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 		     root, fs_info, location->objectid);
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path) {
+		free(root);
+		return ERR_PTR(-ENOMEM);
+	}
+
 	ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 	if (ret != 0) {
 		if (ret > 0)

extent-tree.c

@@ -2714,7 +2714,8 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
 		size += sizeof(*block_info);
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
 
 	ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
 				      ins, size);

file-item.c

@@ -42,7 +42,9 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
 	struct extent_buffer *leaf;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
+
 	file_key.objectid = objectid;
 	file_key.offset = pos;
 	btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
@@ -188,7 +190,8 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
 		btrfs_super_csum_size(root->fs_info->super_copy);
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
 
 	file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
 	file_key.offset = bytenr;

inode-map.c

@@ -39,7 +39,9 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
 	u64 search_start = dirid;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
+
 	search_start = root->last_inode_alloc;
 	search_start = max((unsigned long long)search_start,
 				BTRFS_FIRST_FREE_OBJECTID);

root-tree.c

@@ -31,12 +31,14 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
 	int ret;
 	int slot;
 
+	path = btrfs_alloc_path();
+	if (!path)
+		return -ENOMEM;
+
 	search_key.objectid = objectid;
 	search_key.type = BTRFS_ROOT_ITEM_KEY;
 	search_key.offset = (u64)-1;
 
-	path = btrfs_alloc_path();
-	BUG_ON(!path);
 	ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
 	if (ret < 0)
 		goto out;
@@ -74,7 +76,9 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	u32 old_len;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
+
 	ret = btrfs_search_slot(trans, root, key, path, 0, 1);
 	if (ret < 0)
 		goto out;

volumes.c

@@ -459,7 +459,8 @@ static int find_next_chunk(struct btrfs_root *root, u64 objectid, u64 *offset)
 	struct btrfs_key found_key;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
 
 	key.objectid = objectid;
 	key.offset = (u64)-1;