16 struct dm_space_map {  struct
17 	void (*destroy)(struct dm_space_map *sm);  argument
22 	int (*extend)(struct dm_space_map *sm, dm_block_t extra_blocks);  argument
28 	int (*get_nr_blocks)(struct dm_space_map *sm, dm_block_t *count);  argument
38 	int (*get_nr_free)(struct dm_space_map *sm, dm_block_t *count);  argument
40 	int (*get_count)(struct dm_space_map *sm, dm_block_t b, uint32_t *result);  argument
41 	int (*count_is_more_than_one)(struct dm_space_map *sm, dm_block_t b,  argument
43 	int (*set_count)(struct dm_space_map *sm, dm_block_t b, uint32_t count);  argument
45 	int (*commit)(struct dm_space_map *sm);  argument
47 	int (*inc_block)(struct dm_space_map *sm, dm_block_t b);  argument
48 	int (*dec_block)(struct dm_space_map *sm, dm_block_t b);  argument
53 	int (*new_block)(struct dm_space_map *sm, dm_block_t *b);  argument
60 	int (*root_size)(struct dm_space_map *sm, size_t *result);  argument
61 	int (*copy_root)(struct dm_space_map *sm, void *copy_to_here_le, size_t len);  argument