]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - drivers/md/dm-rq.h
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-zesty-kernel.git] / drivers / md / dm-rq.h
CommitLineData
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
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 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 */
42struct dm_rq_clone_bio_info {
43 struct bio *orig;
44 struct dm_rq_target_io *tio;
45 struct bio clone;
46};
47
48bool dm_use_blk_mq_default(void);
49bool dm_use_blk_mq(struct mapped_device *md);
50
51int dm_old_init_request_queue(struct mapped_device *md);
e83068a5 52int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t);
4cc96131
MS
53void dm_mq_cleanup_mapped_device(struct mapped_device *md);
54
55void dm_start_queue(struct request_queue *q);
56void dm_stop_queue(struct request_queue *q);
57
58unsigned dm_get_reserved_rq_based_ios(void);
59
60ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
61ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
62 const char *buf, size_t count);
63
64#endif