193 /* check to see if two extent_map structs are adjacent and safe to merge */
200 	 * don't merge compressed extents, we need to know their  in mergable_maps()
211 	 * We don't want to merge stuff that hasn't been written to the log yet  in mergable_maps()
241 	struct extent_map *merge = NULL;  in try_merge_map()  local
258 			merge = rb_entry(rb, struct extent_map, rb_node);  in try_merge_map()
259 		if (rb && mergable_maps(merge, em)) {  in try_merge_map()
260 			em->start = merge->start;  in try_merge_map()
261 			em->orig_start = merge->orig_start;  in try_merge_map()
262 			em->len += merge->len;  in try_merge_map()
263 			em->block_len += merge->block_len;  in try_merge_map()
264 			em->block_start = merge->block_start;  in try_merge_map()
265 			em->mod_len = (em->mod_len + em->mod_start) - merge->mod_start;  in try_merge_map()
266 			em->mod_start = merge->mod_start;  in try_merge_map()
267 			em->generation = max(em->generation, merge->generation);  in try_merge_map()
270 			rb_erase_cached(&merge->rb_node, &tree->map);  in try_merge_map()
271 			RB_CLEAR_NODE(&merge->rb_node);  in try_merge_map()
272 			free_extent_map(merge);  in try_merge_map()
278 		merge = rb_entry(rb, struct extent_map, rb_node);  in try_merge_map()
279 	if (rb && mergable_maps(em, merge)) {  in try_merge_map()
280 		em->len += merge->len;  in try_merge_map()
281 		em->block_len += merge->block_len;  in try_merge_map()
282 		rb_erase_cached(&merge->rb_node, &tree->map);  in try_merge_map()
283 		RB_CLEAR_NODE(&merge->rb_node);  in try_merge_map()
284 		em->mod_len = (merge->mod_start + merge->mod_len) - em->mod_start;  in try_merge_map()
285 		em->generation = max(em->generation, merge->generation);  in try_merge_map()
287 		free_extent_map(merge);  in try_merge_map()
403  * Insert @em into @tree or perform a simple forward/backward merge with
406  * reference dropped if the merge attempt was successful.
604  * b) Merge the existing extent with @em_in passed in.
653 "unexpected error %d: merge existing(start %llu len %llu) with em(start %llu len %llu)\n",  in btrfs_add_extent_mapping()