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
17struct mapped_device;
18
19/*
20 * One of these is allocated per request.
21 */
22struct 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	blk_status_t error;
28	union map_info info;
29	struct dm_stats_aux stats_aux;
30	unsigned long duration_jiffies;
31	unsigned n_sectors;
32	unsigned completed;
33};
34
35/*
36 * For request-based dm - the bio clones we allocate are embedded in these
37 * structs.
38 *
39 * We allocate these with bio_alloc_bioset, using the front_pad parameter when
40 * the bioset is created - this means the bio has to come at the end of the
41 * struct.
42 */
43struct dm_rq_clone_bio_info {
44	struct bio *orig;
45	struct dm_rq_target_io *tio;
46	struct bio clone;
47};
48
49bool dm_use_blk_mq_default(void);
50bool dm_use_blk_mq(struct mapped_device *md);
51
52int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t);
53int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
54void dm_mq_cleanup_mapped_device(struct mapped_device *md);
55
56void dm_start_queue(struct request_queue *q);
57void dm_stop_queue(struct request_queue *q);
58
59void dm_mq_kick_requeue_list(struct mapped_device *md);
60
61unsigned dm_get_reserved_rq_based_ios(void);
62
63ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
64ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
65						     const char *buf, size_t count);
66
67#endif