fs/btrfs/inode.c

24 	struct btrfs_path path;
32 	btrfs_init_path(&path);
34 	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
41 	fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
43 	if (btrfs_file_extent_type(path.nodes[0], fi) !=
49 	if (btrfs_file_extent_compression(path.nodes[0], fi) !=
55 	if (btrfs_file_extent_ram_bytes(path.nodes[0], fi) >=
59 			ino, btrfs_file_extent_ram_bytes(path.nodes[0], fi));
62 	read_extent_buffer(path.nodes[0], target,
64 			btrfs_file_extent_ram_bytes(path.nodes[0], fi));
65 	ret = btrfs_file_extent_ram_bytes(path.nodes[0], fi);
67 	btrfs_release_path(&path);
76 	struct btrfs_path path;
80 	btrfs_init_path(&path);
85 	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
93 	ret = btrfs_previous_item(root, &path, rootid, BTRFS_ROOT_BACKREF_KEY);
100 	btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
101 	root_ref = btrfs_item_ptr(path.nodes[0], path.slots[0],
104 	*dir_ret = btrfs_root_ref_dirid(path.nodes[0], root_ref);
106 	btrfs_release_path(&path);
123 	struct btrfs_path path;
152 	btrfs_init_path(&path);
157 	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
165 	ret = btrfs_previous_item(root, &path, ino, BTRFS_INODE_REF_KEY);
172 	btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
176 	btrfs_release_path(&path);
180 static inline int next_length(const char *path)
183 	while (*path != '\0' && *path != '/') {
185 		++path;
220 	struct btrfs_path path;
223 	btrfs_init_path(&path);
225 	dir_item = btrfs_lookup_dir_item(NULL, root, &path, ino, name,
232 	btrfs_dir_item_key_to_cpu(path.nodes[0], dir_item, key_ret);
233 	*type_ret = btrfs_dir_type(path.nodes[0], dir_item);
235 	btrfs_release_path(&path);
240  * Resolve a full path @filename. The start point is @ino of @root.
258 	/* If the path is absolute path, also search from fs root */
361 int btrfs_read_extent_inline(struct btrfs_path *path,
364 	struct extent_buffer *leaf = path->nodes[0];
365 	int slot = path->slots[0];
420 int btrfs_read_extent_reg(struct btrfs_path *path,
424 	struct extent_buffer *leaf = path->nodes[0];
437 	int slot = path->slots[0];
529  * return 0 for found, and path points to the file extent.
534 static int lookup_data_extent(struct btrfs_root *root, struct btrfs_path *path,
547 	ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
552 	ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY);
558 	btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
563 	fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
565 	extent_type = btrfs_file_extent_type(path->nodes[0], fi);
576 	    btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
579 	ret = btrfs_next_item(root, path);
587 	btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
588 	fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
603 	    btrfs_file_extent_num_bytes(path->nodes[0], fi) > file_offset)
606 	ret = btrfs_next_item(root, path);
613 	btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
622 static int read_and_truncate_page(struct btrfs_path *path,
626 	struct extent_buffer *leaf = path->nodes[0];
642 		ret = btrfs_read_extent_inline(path, fi, buf);
648 	ret = btrfs_read_extent_reg(path, fi,
665 	struct btrfs_path path;
673 	btrfs_init_path(&path);
680 		ret = lookup_data_extent(root, &path, ino, aligned_start,
686 			fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
688 			ret = read_and_truncate_page(&path, fi, file_offset,
709 		btrfs_release_path(&path);
710 		ret = lookup_data_extent(root, &path, ino, cur, &next_offset);
728 		fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
730 		btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
731 		type = btrfs_file_extent_type(path.nodes[0], fi);
733 			ret = btrfs_read_extent_inline(&path, fi, dest);
738 		    btrfs_file_extent_disk_bytenr(path.nodes[0], fi) == 0) {
740 					path.nodes[0], fi);
745 		extent_num_bytes = btrfs_file_extent_num_bytes(path.nodes[0],
747 		ret = btrfs_read_extent_reg(&path, fi, cur,
757 		btrfs_release_path(&path);
758 		ret = lookup_data_extent(root, &path, ino, aligned_end,
763 		fi = btrfs_item_ptr(path.nodes[0], path.slots[0],
765 		ret = read_and_truncate_page(&path, fi, aligned_end,
770 	btrfs_release_path(&path);