888 	struct extent_map *em = NULL;  in check_defrag_in_cache()  local
893 	em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);  in check_defrag_in_cache()
896 	if (em) {  in check_defrag_in_cache()
897 		end = extent_map_end(em);  in check_defrag_in_cache()
898 		free_extent_map(em);  in check_defrag_in_cache()
982 	struct extent_map *em;  in defrag_lookup_extent()  local
990 	em = lookup_extent_mapping(em_tree, start, len);  in defrag_lookup_extent()
993 	if (!em) {  in defrag_lookup_extent()
999 		em = btrfs_get_extent(inode, NULL, 0, start, len, 0);  in defrag_lookup_extent()
1002 		if (IS_ERR(em))  in defrag_lookup_extent()
1006 	return em;  in defrag_lookup_extent()
1009 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)  in defrag_check_next_extent()  argument
1015 	if (em->start + em->len >= i_size_read(inode))  in defrag_check_next_extent()
1018 	next = defrag_lookup_extent(inode, em->start + em->len);  in defrag_check_next_extent()
1021 	else if ((em->block_start + em->block_len == next->block_start) &&  in defrag_check_next_extent()
1022 		 (em->block_len > 128 * 1024 && next->block_len > 128 * 1024))  in defrag_check_next_extent()
1033 	struct extent_map *em;  in should_defrag_range()  local
1046 	em = defrag_lookup_extent(inode, start);  in should_defrag_range()
1047 	if (!em)  in should_defrag_range()
1051 	if (em->block_start >= EXTENT_MAP_LAST_BYTE) {  in should_defrag_range()
1056 	next_mergeable = defrag_check_next_extent(inode, em);  in should_defrag_range()
1062 	    (em->len >= thresh || !next_mergeable))  in should_defrag_range()
1074 		*defrag_end = extent_map_end(em);  in should_defrag_range()
1077 		*skip = extent_map_end(em);  in should_defrag_range()
1081 	free_extent_map(em);  in should_defrag_range()
3123 	struct extent_map *em;  in clone_update_extent_map()  local
3126 	em = alloc_extent_map();  in clone_update_extent_map()
3127 	if (!em) {  in clone_update_extent_map()
3138 		btrfs_extent_item_to_extent_map(inode, path, fi, false, em);  in clone_update_extent_map()
3139 		em->generation = -1;  in clone_update_extent_map()
3145 		em->start = hole_offset;  in clone_update_extent_map()
3146 		em->len = hole_len;  in clone_update_extent_map()
3147 		em->ram_bytes = em->len;  in clone_update_extent_map()
3148 		em->orig_start = hole_offset;  in clone_update_extent_map()
3149 		em->block_start = EXTENT_MAP_HOLE;  in clone_update_extent_map()
3150 		em->block_len = 0;  in clone_update_extent_map()
3151 		em->orig_block_len = 0;  in clone_update_extent_map()
3152 		em->compress_type = BTRFS_COMPRESS_NONE;  in clone_update_extent_map()
3153 		em->generation = trans->transid;  in clone_update_extent_map()
3158 		ret = add_extent_mapping(em_tree, em, 1);  in clone_update_extent_map()
3161 			free_extent_map(em);  in clone_update_extent_map()
3164 		btrfs_drop_extent_cache(inode, em->start,  in clone_update_extent_map()
3165 					em->start + em->len - 1, 0);  in clone_update_extent_map()