[mirror_ubuntu-zesty-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;

/*
 * One of these is allocated per request.
 */
struct dm_rq_target_io {
	struct mapped_device *md;
	struct dm_target *ti;
	struct request *orig, *clone;
	struct kthread_work work;
	int error;
	union map_info info;
	struct dm_stats_aux stats_aux;
	unsigned long duration_jiffies;
	unsigned n_sectors;
};

/*
 * 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;
};

bool dm_use_blk_mq_default(void);
bool dm_use_blk_mq(struct mapped_device *md);

int dm_old_init_request_queue(struct mapped_device *md);
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);

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
	19	/*
	20	* One of these is allocated per request.
	21	*/
	22	struct dm_rq_target_io {
	23	struct mapped_device *md;
	24	struct dm_target *ti;
	25	struct request orig, clone;
	26	struct kthread_work work;
	27	int error;
	28	union map_info info;
	29	struct dm_stats_aux stats_aux;
	30	unsigned long duration_jiffies;
	31	unsigned n_sectors;
	32	};
	33
	34	/*
	35	* For request-based dm - the bio clones we allocate are embedded in these
	36	* structs.
	37	*
	38	* We allocate these with bio_alloc_bioset, using the front_pad parameter when
	39	* the bioset is created - this means the bio has to come at the end of the
	40	* struct.
	41	*/
	42	struct dm_rq_clone_bio_info {
	43	struct bio *orig;
	44	struct dm_rq_target_io *tio;
	45	struct bio clone;
	46	};
	47
	48	bool dm_use_blk_mq_default(void);
	49	bool dm_use_blk_mq(struct mapped_device *md);
	50
	51	int dm_old_init_request_queue(struct mapped_device *md);
e83068a5	52	int dm_mq_init_request_queue(struct mapped_device md, struct dm_table t);
4cc96131 MS	53	void dm_mq_cleanup_mapped_device(struct mapped_device *md);
	54
	55	void dm_start_queue(struct request_queue *q);
	56	void dm_stop_queue(struct request_queue *q);
	57
	58	unsigned dm_get_reserved_rq_based_ios(void);
	59
	60	ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device md, char buf);
	61	ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
	62	const char *buf, size_t count);
	63
	64	#endif