fs/btrfs/qgroup.c

2174  * @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ]
2185  *    The key for search can be extracted from @dst_path->nodes[dst_level]
2188  * 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty
2202 				    struct btrfs_path *dst_path,
2225 		btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
2227 		btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
2232 	src_path->slots[root_level] = dst_path->slots[root_level];
2259 		src_path->slots[cur_level] = dst_path->slots[cur_level];
2261 			btrfs_node_key_to_cpu(dst_path->nodes[cur_level],
2262 					&dst_key, dst_path->slots[cur_level]);
2266 			btrfs_item_key_to_cpu(dst_path->nodes[cur_level],
2267 					&dst_key, dst_path->slots[cur_level]);
2280 	 * Now both @dst_path and @src_path have been populated, record the tree
2287 	ret = btrfs_qgroup_trace_extent(trans, dst_path->nodes[dst_level]->start,
2297 		ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]);
2317  * @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ],
2328 					   struct btrfs_path *dst_path,
2349 	if (dst_path->nodes[cur_level] == NULL) {
2354 		 * dst_path->nodes[root_level] must be initialized before
2359 	"%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d",
2368 		eb = dst_path->nodes[cur_level + 1];
2369 		parent_slot = dst_path->slots[cur_level + 1];
2382 		dst_path->nodes[cur_level] = eb;
2383 		dst_path->slots[cur_level] = 0;
2386 		dst_path->locks[cur_level] = BTRFS_READ_LOCK;
2391 	ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level,
2396 	eb = dst_path->nodes[cur_level];
2404 			dst_path->slots[cur_level] = i;
2408 					dst_path, cur_level - 1, root_level,
2418 		btrfs_tree_unlock_rw(dst_path->nodes[cur_level],
2419 				     dst_path->locks[cur_level]);
2420 		free_extent_buffer(dst_path->nodes[cur_level]);
2421 		dst_path->nodes[cur_level] = NULL;
2422 		dst_path->slots[cur_level] = 0;
2423 		dst_path->locks[cur_level] = 0;
2435 	struct btrfs_path *dst_path = NULL;
2457 	dst_path = btrfs_alloc_path();
2458 	if (!dst_path) {
2462 	/* For dst_path */
2464 	dst_path->nodes[level] = dst_eb;
2465 	dst_path->slots[level] = 0;
2466 	dst_path->locks[level] = 0;
2469 	ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
2476 	btrfs_free_path(dst_path);