[mirror_ubuntu-jammy-kernel.git] / drivers / md / dm-rq.h

/*
 * Internal header file for device mapper
 *
 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the LGPL.
 */

#ifndef DM_RQ_INTERNAL_H
#define DM_RQ_INTERNAL_H

#include <linux/bio.h>
#include <linux/kthread.h>

#include "dm-stats.h"

struct mapped_device;

/*
 * For request-based dm - the bio clones we allocate are embedded in these
 * structs.
 *
 * We allocate these with bio_alloc_bioset, using the front_pad parameter when
 * the bioset is created - this means the bio has to come at the end of the
 * struct.
 */
struct dm_rq_clone_bio_info {
	struct bio *orig;
	struct dm_rq_target_io *tio;
	struct bio clone;
};

int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
void dm_mq_cleanup_mapped_device(struct mapped_device *md);

void dm_start_queue(struct request_queue *q);
void dm_stop_queue(struct request_queue *q);

void dm_mq_kick_requeue_list(struct mapped_device *md);

unsigned dm_get_reserved_rq_based_ios(void);

ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
						     const char *buf, size_t count);

#endif
Commit	Line	Data
4cc96131 MS	1	/*
	2	* Internal header file for device mapper
	3	*
	4	* Copyright (C) 2016 Red Hat, Inc. All rights reserved.
	5	*
	6	* This file is released under the LGPL.
	7	*/
	8
	9	#ifndef DM_RQ_INTERNAL_H
	10	#define DM_RQ_INTERNAL_H
	11
	12	#include <linux/bio.h>
	13	#include <linux/kthread.h>
	14
	15	#include "dm-stats.h"
	16
	17	struct mapped_device;
	18
4cc96131 MS	19	/*
	20	* For request-based dm - the bio clones we allocate are embedded in these
	21	* structs.
	22	*
	23	* We allocate these with bio_alloc_bioset, using the front_pad parameter when
	24	* the bioset is created - this means the bio has to come at the end of the
	25	* struct.
	26	*/
	27	struct dm_rq_clone_bio_info {
	28	struct bio *orig;
	29	struct dm_rq_target_io *tio;
	30	struct bio clone;
	31	};
	32
e83068a5	33	int dm_mq_init_request_queue(struct mapped_device md, struct dm_table t);
4cc96131 MS	34	void dm_mq_cleanup_mapped_device(struct mapped_device *md);
	35
	36	void dm_start_queue(struct request_queue *q);
	37	void dm_stop_queue(struct request_queue *q);
	38
e0c10752 MS	39	void dm_mq_kick_requeue_list(struct mapped_device *md);
e0c10752 MS	40
4cc96131 MS	41	unsigned dm_get_reserved_rq_based_ios(void);
	42
	43	ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device md, char buf);
	44	ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
	45	const char *buf, size_t count);
	46
	47	#endif