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  * 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 
33 int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
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 
39 void dm_mq_kick_requeue_list(struct mapped_device *md);
40 
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
48