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Current Path : /lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/

Linux 43-225-53-84.webhostbox.net 3.10.0-1160.92.1.el7.x86_64 #1 SMP Tue Jun 20 11:48:01 UTC 2023 x86_64

Current File : //lib/modules/3.10.0-1160.92.1.el7.x86_64/build/include/linux/dm-region-hash.h

/*
 * Copyright (C) 2003 Sistina Software Limited.
 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
 *
 * Device-Mapper dirty region hash interface.
 *
 * This file is released under the GPL.
 */

#ifndef DM_REGION_HASH_H
#define DM_REGION_HASH_H

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

/*-----------------------------------------------------------------
 * Region hash
 *----------------------------------------------------------------*/
struct dm_region_hash;
struct dm_region;

/*
 * States a region can have.
 */
enum dm_rh_region_states {
	DM_RH_CLEAN	 = 0x01,	/* No writes in flight. */
	DM_RH_DIRTY	 = 0x02,	/* Writes in flight. */
	DM_RH_NOSYNC	 = 0x04,	/* Out of sync. */
	DM_RH_RECOVERING = 0x08,	/* Under resynchronization. */
};

/*
 * Region hash create/destroy.
 */
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 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);

/*
 * Conversion functions.
 */
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);

/*
 * Get region size and key (ie. number of the region).
 */
sector_t dm_rh_get_region_size(struct dm_region_hash *rh);
region_t dm_rh_get_region_key(struct dm_region *reg);

/*
 * Get/set/update region state (and dirty log).
 *
 */
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);

/* Non-zero errors_handled leaves the state of the region NOSYNC */
void dm_rh_update_states(struct dm_region_hash *rh, int errors_handled);

/* Flush the region hash and dirty log. */
int dm_rh_flush(struct dm_region_hash *rh);

/* Inc/dec pending count on regions. */
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);

/* Delay bios on regions. */
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);

/*
 * Region recovery control.
 */

/* Prepare some regions for recovery by starting to quiesce them. */
void dm_rh_recovery_prepare(struct dm_region_hash *rh);

/* Try fetching a quiesced region for recovery. */
struct dm_region *dm_rh_recovery_start(struct dm_region_hash *rh);

/* Report recovery end on a region. */
void dm_rh_recovery_end(struct dm_region *reg, int error);

/* Returns number of regions with recovery work outstanding. */
int dm_rh_recovery_in_flight(struct dm_region_hash *rh);

/* Start/stop recovery. */
void dm_rh_start_recovery(struct dm_region_hash *rh);
void dm_rh_stop_recovery(struct dm_region_hash *rh);

#endif /* DM_REGION_HASH_H */

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