

#ifndef DM_REGION_HASH_H
#define DM_REGION_HASH_H

#include <linux/dm-dirty-log.h>


struct dm_region_hash;
struct dm_region;


enum dm_rh_region_states {
	DM_RH_CLEAN	 = 0x01,	
	DM_RH_DIRTY	 = 0x02,	
	DM_RH_NOSYNC	 = 0x04,	
	DM_RH_RECOVERING = 0x08,	
};


struct bio_list;
struct dm_region_hash *dm_region_hash_create(
		void *context, void (*dispatch_bios)(void *context,
						     struct bio_list *bios),
		void (*wakeup_workers)(void *context),
		void (*wakeup_all_recovery_waiters)(void *context),
		sector_t target_begin, unsigned int max_recovery,
		struct dm_dirty_log *log, uint32_t region_size,
		region_t nr_regions);
void dm_region_hash_destroy(struct dm_region_hash *rh);

struct dm_dirty_log *dm_rh_dirty_log(struct dm_region_hash *rh);


region_t dm_rh_bio_to_region(struct dm_region_hash *rh, struct bio *bio);
sector_t dm_rh_region_to_sector(struct dm_region_hash *rh, region_t region);
void *dm_rh_region_context(struct dm_region *reg);


sector_t dm_rh_get_region_size(struct dm_region_hash *rh);
region_t dm_rh_get_region_key(struct dm_region *reg);


int dm_rh_get_state(struct dm_region_hash *rh, region_t region, int may_block);
void dm_rh_set_state(struct dm_region_hash *rh, region_t region,
		     enum dm_rh_region_states state, int may_block);


void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled);


int dm_rh_flush(struct dm_region_hash *rh);


void dm_rh_inc_pending(struct dm_region_hash *rh, struct bio_list *bios);
void dm_rh_dec(struct dm_region_hash *rh, region_t region);


void dm_rh_delay(struct dm_region_hash *rh, struct bio *bio);

void dm_rh_mark_nosync(struct dm_region_hash *rh, struct bio *bio);




void dm_rh_recovery_prepare(struct dm_region_hash *rh);


struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh);


void dm_rh_recovery_end(struct dm_region *reg, int error);


int dm_rh_recovery_in_flight(struct dm_region_hash *rh);


void dm_rh_start_recovery(struct dm_region_hash *rh);
void dm_rh_stop_recovery(struct dm_region_hash *rh);

#endif 
