19 struct dm_space_map {  struct
20 	void (*destroy)(struct dm_space_map *sm);  argument
25 	int (*extend)(struct dm_space_map *sm, dm_block_t extra_blocks);  argument
31 	int (*get_nr_blocks)(struct dm_space_map *sm, dm_block_t *count);  argument
41 	int (*get_nr_free)(struct dm_space_map *sm, dm_block_t *count);  argument
43 	int (*get_count)(struct dm_space_map *sm, dm_block_t b, uint32_t *result);  argument
44 	int (*count_is_more_than_one)(struct dm_space_map *sm, dm_block_t b,  argument
46 	int (*set_count)(struct dm_space_map *sm, dm_block_t b, uint32_t count);  argument
48 	int (*commit)(struct dm_space_map *sm);  argument
50 	int (*inc_blocks)(struct dm_space_map *sm, dm_block_t b, dm_block_t e);  argument
51 	int (*dec_blocks)(struct dm_space_map *sm, dm_block_t b, dm_block_t e);  argument
56 	int (*new_block)(struct dm_space_map *sm, dm_block_t *b);  argument
63 	int (*root_size)(struct dm_space_map *sm, size_t *result);  argument
64 	int (*copy_root)(struct dm_space_map *sm, void *copy_to_here_le, size_t len);  argument
70 	int (*register_threshold_callback)(struct dm_space_map *sm,  argument