212 	/* Don't merge compressed extents, we need to know their actual size. */  in can_merge_extent_map()
220 	 * We don't want to merge stuff that hasn't been written to the log yet  in can_merge_extent_map()
230 /* Check to see if two extent_map structs are adjacent and safe to merge. */
252  * Handle the on-disk data extents merge for @prev and @next.
254  * @prev:    left extent to merge
255  * @next:    right extent to merge
256  * @merged:  the extent we will not discard after the merge; updated with new values
293 	 * For case 2), we just merge the two data extents into one.  in merge_ondisk_extents()
345 	struct extent_map *merge = NULL;  in try_merge_map()  local
365 			merge = rb_entry(rb, struct extent_map, rb_node);  in try_merge_map()
366 		if (rb && can_merge_extent_map(merge) && mergeable_maps(merge, em)) {  in try_merge_map()
367 			em->start = merge->start;  in try_merge_map()
368 			em->len += merge->len;  in try_merge_map()
369 			em->generation = max(em->generation, merge->generation);  in try_merge_map()
372 				merge_ondisk_extents(merge, em, em);  in try_merge_map()
376 			remove_em(inode, merge);  in try_merge_map()
377 			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 		em->generation = max(em->generation, merge->generation);  in try_merge_map()
391 		remove_em(inode, merge);  in try_merge_map()
392 		free_extent_map(merge);  in try_merge_map()
484  * forward/backward merge with existing mappings.  The extent_map struct passed
486  * taken, or a reference dropped if the merge attempt was successful.
692  * b) Merge the existing extent with @em_in passed in.
745 "extent map merge error existing [%llu, %llu) with em [%llu, %llu) start %llu",  in btrfs_add_extent_mapping()