938 	struct extent_map *em;  in __get_extent_map()  local
941 		em = *em_cached;  in __get_extent_map()
942 		if (extent_map_in_tree(em) && start >= em->start &&  in __get_extent_map()
943 		    start < extent_map_end(em)) {  in __get_extent_map()
944 			refcount_inc(&em->refs);  in __get_extent_map()
945 			return em;  in __get_extent_map()
948 		free_extent_map(em);  in __get_extent_map()
952 	em = btrfs_get_extent(BTRFS_I(inode), page, pg_offset, start, len);  in __get_extent_map()
953 	if (em_cached && !IS_ERR(em)) {  in __get_extent_map()
955 		refcount_inc(&em->refs);  in __get_extent_map()
956 		*em_cached = em;  in __get_extent_map()
958 	return em;  in __get_extent_map()
978 	struct extent_map *em;  in btrfs_do_readpage()  local
1015 		em = __get_extent_map(inode, page, pg_offset, cur,  in btrfs_do_readpage()
1017 		if (IS_ERR(em)) {  in btrfs_do_readpage()
1020 			return PTR_ERR(em);  in btrfs_do_readpage()
1022 		extent_offset = cur - em->start;  in btrfs_do_readpage()
1023 		BUG_ON(extent_map_end(em) <= cur);  in btrfs_do_readpage()
1026 		if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))  in btrfs_do_readpage()
1027 			compress_type = em->compress_type;  in btrfs_do_readpage()
1029 		iosize = min(extent_map_end(em) - cur, end - cur + 1);  in btrfs_do_readpage()
1032 			disk_bytenr = em->block_start;  in btrfs_do_readpage()
1034 			disk_bytenr = em->block_start + extent_offset;  in btrfs_do_readpage()
1035 		block_start = em->block_start;  in btrfs_do_readpage()
1036 		if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags))  in btrfs_do_readpage()
1073 		if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) &&  in btrfs_do_readpage()
1075 		    *prev_em_start != em->start)  in btrfs_do_readpage()
1079 			*prev_em_start = em->start;  in btrfs_do_readpage()
1081 		free_extent_map(em);  in btrfs_do_readpage()
1082 		em = NULL;  in btrfs_do_readpage()
1292 	struct extent_map *em;  in __extent_writepage_io()  local
1335 		em = btrfs_get_extent(inode, NULL, 0, cur, len);  in __extent_writepage_io()
1336 		if (IS_ERR(em)) {  in __extent_writepage_io()
1337 			ret = PTR_ERR_OR_ZERO(em);  in __extent_writepage_io()
1341 		extent_offset = cur - em->start;  in __extent_writepage_io()
1342 		em_end = extent_map_end(em);  in __extent_writepage_io()
1345 		ASSERT(IS_ALIGNED(em->start, fs_info->sectorsize));  in __extent_writepage_io()
1346 		ASSERT(IS_ALIGNED(em->len, fs_info->sectorsize));  in __extent_writepage_io()
1348 		block_start = em->block_start;  in __extent_writepage_io()
1349 		disk_bytenr = em->block_start + extent_offset;  in __extent_writepage_io()
1351 		ASSERT(!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags));  in __extent_writepage_io()
1360 		free_extent_map(em);  in __extent_writepage_io()
1361 		em = NULL;  in __extent_writepage_io()
2329 	struct extent_map *em;  in try_release_extent_mapping()  local
2345 			em = lookup_extent_mapping(map, start, len);  in try_release_extent_mapping()
2346 			if (!em) {  in try_release_extent_mapping()
2350 			if (test_bit(EXTENT_FLAG_PINNED, &em->flags) ||  in try_release_extent_mapping()
2351 			    em->start != start) {  in try_release_extent_mapping()
2353 				free_extent_map(em);  in try_release_extent_mapping()
2356 			if (test_range_bit(tree, em->start,  in try_release_extent_mapping()
2357 					   extent_map_end(em) - 1,  in try_release_extent_mapping()
2366 			if (list_empty(&em->list) ||  in try_release_extent_mapping()
2367 			    test_bit(EXTENT_FLAG_LOGGING, &em->flags))  in try_release_extent_mapping()
2380 			if (em->generation >= cur_gen)  in try_release_extent_mapping()
2391 			remove_extent_mapping(map, em);  in try_release_extent_mapping()
2393 			free_extent_map(em);  in try_release_extent_mapping()
2395 			start = extent_map_end(em);  in try_release_extent_mapping()
2399 			free_extent_map(em);  in try_release_extent_mapping()