em1 4085 fs/btrfs/tree-log.c struct extent_map *em1, *em2; em1 4087 fs/btrfs/tree-log.c em1 = list_entry(a, struct extent_map, list); em1 4090 fs/btrfs/tree-log.c if (em1->start < em2->start) em1 4092 fs/btrfs/tree-log.c else if (em1->start > em2->start)