surf_action_t(*write) (void *storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);
surf_action_t(*stat) (void *storage, int fd, void* buf);
void* (*create_resource) (const char* id, const char* model,const char* type_id,
surf_action_t(*write) (void *storage, const void* ptr, size_t size, size_t nmemb, surf_file_t stream);
surf_action_t(*stat) (void *storage, int fd, void* buf);
void* (*create_resource) (const char* id, const char* model,const char* type_id,