209 	/* Don't merge compressed extents, we need to know their actual size. */  in can_merge_extent_map()
217 	 * We don't want to merge stuff that hasn't been written to the log yet  in can_merge_extent_map()
227 /* Check to see if two extent_map structs are adjacent and safe to merge. */
249  * Handle the on-disk data extents merge for @prev and @next.
251  * @prev:    left extent to merge
252  * @next:    right extent to merge
253  * @merged:  the extent we will not discard after the merge; updated with new values
290 	 * For case 2), we just merge the two data extents into one.  in merge_ondisk_extents()
343 	struct extent_map *merge = NULL;  in try_merge_map()  local
363 			merge = rb_entry(rb, struct extent_map, rb_node);  in try_merge_map()
364 		if (rb && can_merge_extent_map(merge) && mergeable_maps(merge, em)) {  in try_merge_map()
365 			em->start = merge->start;  in try_merge_map()
366 			em->len += merge->len;  in try_merge_map()
367 			em->generation = max(em->generation, merge->generation);  in try_merge_map()
370 				merge_ondisk_extents(merge, em, em);  in try_merge_map()
374 			rb_erase(&merge->rb_node, &tree->root);  in try_merge_map()
375 			RB_CLEAR_NODE(&merge->rb_node);  in try_merge_map()
376 			free_extent_map(merge);  in try_merge_map()
383 		merge = rb_entry(rb, struct extent_map, rb_node);  in try_merge_map()
384 	if (rb && can_merge_extent_map(merge) && mergeable_maps(em, merge)) {  in try_merge_map()
385 		em->len += merge->len;  in try_merge_map()
387 			merge_ondisk_extents(em, merge, em);  in try_merge_map()
389 		rb_erase(&merge->rb_node, &tree->root);  in try_merge_map()
390 		RB_CLEAR_NODE(&merge->rb_node);  in try_merge_map()
391 		em->generation = max(em->generation, merge->generation);  in try_merge_map()
393 		free_extent_map(merge);  in try_merge_map()
486  * forward/backward merge with existing mappings.  The extent_map struct passed
488  * taken, or a reference dropped if the merge attempt was successful.
696  * b) Merge the existing extent with @em_in passed in.
749 "extent map merge error existing [%llu, %llu) with em [%llu, %llu) start %llu",  in btrfs_add_extent_mapping()