#ifndef __DMU_H
#define __DMU_H

#include <stdint.h>

/**************
 * dm-userspace
 **************/

struct dmu_context;
struct dmu_map_data;

/* Returns 1 to allow IO to complete, 0 to delay */
typedef int (*map_done_handler_t)(void *data, struct dmu_map_data *map_data);

/* Returns 1 to map IO, -1 to fail IO, 0 to delay */
typedef int (*map_req_handler_t)(void *data, struct dmu_map_data *map_data);

/* High-level control operations */
struct dmu_context *dmu_ctl_open(char *dev, int flags);
int dmu_ctl_close(struct dmu_context *ctx);
int dmu_ctl_send_queue(struct dmu_context *ctx);
void dmu_register_map_done_handler(struct dmu_context *ctx,
				   map_done_handler_t handler,
				   void *data);
void dmu_register_map_handler(struct dmu_context *ctx,
                              map_req_handler_t handler,
                              void *data);
int dmu_invalidate_block(struct dmu_context *ctx, uint64_t block);
int dmu_events_pending(struct dmu_context *ctx, unsigned int msec);
int dmu_process_events(struct dmu_context *ctx);

/* Map manipulation functions */
void dmu_map_set_block(struct dmu_map_data *data, uint64_t block);
uint64_t dmu_map_get_block(struct dmu_map_data *data);
void dmu_map_set_offset(struct dmu_map_data *data, int64_t offset);
uint32_t dmu_map_get_id(struct dmu_map_data *data);
void dmu_map_set_dest_dev(struct dmu_map_data *data, dev_t dev);
void dmu_map_set_copy_src_dev(struct dmu_map_data *data, dev_t dev);
int dmu_map_is_write(struct dmu_map_data *data);

/* Functions for submitting out-of-order events */
int dmu_async_map(struct dmu_context *ctx, 
		  struct dmu_map_data *data, 
		  int fail);
int dmu_async_map_done(struct dmu_context *ctx, uint64_t id, int fail);

#endif