1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Internal header file for device mapper
4 *
5 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.
6 *
7 * This file is released under the LGPL.
8 */
9
10#ifndef DM_RQ_INTERNAL_H
11#define DM_RQ_INTERNAL_H
12
13#include <linux/bio.h>
14#include <linux/kthread.h>
15
16#include "dm-stats.h"
17
18struct mapped_device;
19
20/*
21 * For request-based dm - the bio clones we allocate are embedded in these
22 * structs.
23 *
24 * We allocate these with bio_alloc_bioset, using the front_pad parameter when
25 * the bioset is created - this means the bio has to come at the end of the
26 * struct.
27 */
28struct dm_rq_clone_bio_info {
29 struct bio *orig;
30 struct dm_rq_target_io *tio;
31 struct bio clone;
32};
33
34int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
35void dm_mq_cleanup_mapped_device(struct mapped_device *md);
36
37void dm_start_queue(struct request_queue *q);
38void dm_stop_queue(struct request_queue *q);
39
40void dm_mq_kick_requeue_list(struct mapped_device *md);
41
42unsigned int dm_get_reserved_rq_based_ios(void);
43
44ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
45ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
46 const char *buf, size_t count);
47
48#endif
49