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1/*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
6 *
7 * This file is released under the LGPL.
8 */
9
10#ifndef DM_INTERNAL_H
11#define DM_INTERNAL_H
12
13#include <linux/fs.h>
14#include <linux/device-mapper.h>
15#include <linux/list.h>
16#include <linux/blkdev.h>
17#include <linux/hdreg.h>
18
19/*
20 * Suspend feature flags
21 */
22#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
23#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
24
25/*
26 * Type of table and mapped_device's mempool
27 */
28#define DM_TYPE_NONE 0
29#define DM_TYPE_BIO_BASED 1
30#define DM_TYPE_REQUEST_BASED 2
31
32/*
33 * List of devices that a metadevice uses and should open/close.
34 */
35struct dm_dev_internal {
36 struct list_head list;
37 atomic_t count;
38 struct dm_dev dm_dev;
39};
40
41struct dm_table;
42struct dm_md_mempools;
43
44/*-----------------------------------------------------------------
45 * Internal table functions.
46 *---------------------------------------------------------------*/
47void dm_table_destroy(struct dm_table *t);
48void dm_table_event_callback(struct dm_table *t,
49 void (*fn)(void *), void *context);
50struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
51struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
52int dm_calculate_queue_limits(struct dm_table *table,
53 struct queue_limits *limits);
54void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
55 struct queue_limits *limits);
56struct list_head *dm_table_get_devices(struct dm_table *t);
57void dm_table_presuspend_targets(struct dm_table *t);
58void dm_table_postsuspend_targets(struct dm_table *t);
59int dm_table_resume_targets(struct dm_table *t);
60int dm_table_any_congested(struct dm_table *t, int bdi_bits);
61int dm_table_any_busy_target(struct dm_table *t);
62int dm_table_set_type(struct dm_table *t);
63unsigned dm_table_get_type(struct dm_table *t);
64bool dm_table_bio_based(struct dm_table *t);
65bool dm_table_request_based(struct dm_table *t);
66int dm_table_alloc_md_mempools(struct dm_table *t);
67void dm_table_free_md_mempools(struct dm_table *t);
68struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
69
70/*
71 * To check the return value from dm_table_find_target().
72 */
73#define dm_target_is_valid(t) ((t)->table)
74
75/*
76 * To check whether the target type is request-based or not (bio-based).
77 */
78#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
79
80/*-----------------------------------------------------------------
81 * A registry of target types.
82 *---------------------------------------------------------------*/
83int dm_target_init(void);
84void dm_target_exit(void);
85struct target_type *dm_get_target_type(const char *name);
86void dm_put_target_type(struct target_type *tt);
87int dm_target_iterate(void (*iter_func)(struct target_type *tt,
88 void *param), void *param);
89
90int dm_split_args(int *argc, char ***argvp, char *input);
91
92/*
93 * The device-mapper can be driven through one of two interfaces;
94 * ioctl or filesystem, depending which patch you have applied.
95 */
96int dm_interface_init(void);
97void dm_interface_exit(void);
98
99/*
100 * sysfs interface
101 */
102int dm_sysfs_init(struct mapped_device *md);
103void dm_sysfs_exit(struct mapped_device *md);
104struct kobject *dm_kobject(struct mapped_device *md);
105struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
106
107/*
108 * Targets for linear and striped mappings
109 */
110int dm_linear_init(void);
111void dm_linear_exit(void);
112
113int dm_stripe_init(void);
114void dm_stripe_exit(void);
115
116int dm_open_count(struct mapped_device *md);
117int dm_lock_for_deletion(struct mapped_device *md);
118
119void dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
120 unsigned cookie);
121
122int dm_kcopyd_init(void);
123void dm_kcopyd_exit(void);
124
125/*
126 * Mempool operations
127 */
128struct dm_md_mempools *dm_alloc_md_mempools(unsigned type);
129void dm_free_md_mempools(struct dm_md_mempools *pools);
130
131#endif