tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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