29  * extent_map_tree_init - initialize extent map tree
30  * @tree:		tree to initialize
32  * Initialize the extent tree @tree.  Should be called for each new inode
35 void extent_map_tree_init(struct extent_map_tree *tree)  in extent_map_tree_init()  argument
37 	tree->map = RB_ROOT;  in extent_map_tree_init()
38 	INIT_LIST_HEAD(&tree->modified_extents);  in extent_map_tree_init()
39 	rwlock_init(&tree->lock);  in extent_map_tree_init()
138  * search through the tree for an extent_map with a given offset.  If
226 static void try_merge_map(struct extent_map_tree *tree, struct extent_map *em)  in try_merge_map()  argument
232 	 * We can't modify an extent map that is in the tree and that is being  in try_merge_map()
235 	 * the tree and 1 for this task (which is unpinning the extent map or  in try_merge_map()
256 			rb_erase(&merge->rb_node, &tree->map);  in try_merge_map()
268 		rb_erase(&merge->rb_node, &tree->map);  in try_merge_map()
278  * @tree:	tree to unpin the extent in
287 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,  in unpin_extent_cache()  argument
294 	write_lock(&tree->lock);  in unpin_extent_cache()
295 	em = lookup_extent_mapping(tree, start, len);  in unpin_extent_cache()
312 	try_merge_map(tree, em);  in unpin_extent_cache()
321 	write_unlock(&tree->lock);  in unpin_extent_cache()
326 void clear_em_logging(struct extent_map_tree *tree, struct extent_map *em)  in clear_em_logging()  argument
330 		try_merge_map(tree, em);  in clear_em_logging()
333 static inline void setup_extent_mapping(struct extent_map_tree *tree,  in setup_extent_mapping()  argument
342 		list_move(&em->list, &tree->modified_extents);  in setup_extent_mapping()
344 		try_merge_map(tree, em);  in setup_extent_mapping()
348  * add_extent_mapping - add new extent map to the extent tree
349  * @tree:	tree to insert new map in
352  * Insert @em into @tree or perform a simple forward/backward merge with
354  * into the tree directly, with an additional reference taken, or a
357 int add_extent_mapping(struct extent_map_tree *tree,  in add_extent_mapping()  argument
362 	ret = tree_insert(&tree->map, em);  in add_extent_mapping()
366 	setup_extent_mapping(tree, em, modified);  in add_extent_mapping()
372 __lookup_extent_mapping(struct extent_map_tree *tree,  in __lookup_extent_mapping()  argument
381 	rb_node = __tree_search(&tree->map, start, &prev, &next);  in __lookup_extent_mapping()
402  * @tree:	tree to lookup in
406  * Find and return the first extent_map struct in @tree that intersects the
407  * [start, len] range.  There may be additional objects in the tree that
411 struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,  in lookup_extent_mapping()  argument
414 	return __lookup_extent_mapping(tree, start, len, 1);  in lookup_extent_mapping()
419  * @tree:	tree to lookup in
423  * Find and return the first extent_map struct in @tree that intersects the
428 struct extent_map *search_extent_mapping(struct extent_map_tree *tree,  in search_extent_mapping()  argument
431 	return __lookup_extent_mapping(tree, start, len, 0);  in search_extent_mapping()
435  * remove_extent_mapping - removes an extent_map from the extent tree
436  * @tree:	extent tree to remove from
439  * Removes @em from @tree.  No reference counts are dropped, and no checks
442 int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)  in remove_extent_mapping()  argument
447 	rb_erase(&em->rb_node, &tree->map);  in remove_extent_mapping()
454 void replace_extent_mapping(struct extent_map_tree *tree,  in replace_extent_mapping()  argument
463 	rb_replace_node(&cur->rb_node, &new->rb_node, &tree->map);  in replace_extent_mapping()
466 	setup_extent_mapping(tree, new, modified);  in replace_extent_mapping()
489 /* helper for btfs_get_extent.  Given an existing extent in the tree,
492  * the best fitted new extent into the tree.
533  * @em_tree - the extent tree into which we want to insert the extent mapping
558 	/* it is possible that someone inserted the extent into the tree  in btrfs_add_extent_mapping()
560 	 * an overlapping map exists in the tree  in btrfs_add_extent_mapping()