tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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/moduleparam.h>
17#include <linux/blkdev.h>
18#include <linux/backing-dev.h>
19#include <linux/hdreg.h>
20#include <linux/completion.h>
21#include <linux/kobject.h>
22#include <linux/refcount.h>
23
24#include "dm-stats.h"
25
26/*
27 * Suspend feature flags
28 */
29#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
30#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
31
32/*
33 * Status feature flags
34 */
35#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
36
37/*
38 * List of devices that a metadevice uses and should open/close.
39 */
40struct dm_dev_internal {
41 struct list_head list;
42 refcount_t count;
43 struct dm_dev *dm_dev;
44};
45
46struct dm_table;
47struct dm_md_mempools;
48struct dm_target_io;
49struct dm_io;
50
51/*-----------------------------------------------------------------
52 * Internal table functions.
53 *---------------------------------------------------------------*/
54void dm_table_event_callback(struct dm_table *t,
55 void (*fn)(void *), void *context);
56struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
57bool dm_table_has_no_data_devices(struct dm_table *table);
58int dm_calculate_queue_limits(struct dm_table *table,
59 struct queue_limits *limits);
60int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
61 struct queue_limits *limits);
62struct list_head *dm_table_get_devices(struct dm_table *t);
63void dm_table_presuspend_targets(struct dm_table *t);
64void dm_table_presuspend_undo_targets(struct dm_table *t);
65void dm_table_postsuspend_targets(struct dm_table *t);
66int dm_table_resume_targets(struct dm_table *t);
67enum dm_queue_mode dm_table_get_type(struct dm_table *t);
68struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
69struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
70struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
71bool dm_table_bio_based(struct dm_table *t);
72bool dm_table_request_based(struct dm_table *t);
73
74void dm_lock_md_type(struct mapped_device *md);
75void dm_unlock_md_type(struct mapped_device *md);
76void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
77enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
78struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
79
80int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
81
82/*
83 * To check whether the target type is bio-based or not (request-based).
84 */
85#define dm_target_bio_based(t) ((t)->type->map != NULL)
86
87/*
88 * To check whether the target type is request-based or not (bio-based).
89 */
90#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
91
92/*
93 * To check whether the target type is a hybrid (capable of being
94 * either request-based or bio-based).
95 */
96#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
97
98/*
99 * Zoned targets related functions.
100 */
101int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
102void dm_zone_endio(struct dm_io *io, struct bio *clone);
103#ifdef CONFIG_BLK_DEV_ZONED
104void dm_cleanup_zoned_dev(struct mapped_device *md);
105int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
106 unsigned int nr_zones, report_zones_cb cb, void *data);
107bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
108int dm_zone_map_bio(struct dm_target_io *io);
109#else
110static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
111#define dm_blk_report_zones NULL
112static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
113{
114 return false;
115}
116static inline int dm_zone_map_bio(struct dm_target_io *tio)
117{
118 return DM_MAPIO_KILL;
119}
120#endif
121
122/*-----------------------------------------------------------------
123 * A registry of target types.
124 *---------------------------------------------------------------*/
125int dm_target_init(void);
126void dm_target_exit(void);
127struct target_type *dm_get_target_type(const char *name);
128void dm_put_target_type(struct target_type *tt);
129int dm_target_iterate(void (*iter_func)(struct target_type *tt,
130 void *param), void *param);
131
132int dm_split_args(int *argc, char ***argvp, char *input);
133
134/*
135 * Is this mapped_device being deleted?
136 */
137int dm_deleting_md(struct mapped_device *md);
138
139/*
140 * Is this mapped_device suspended?
141 */
142int dm_suspended_md(struct mapped_device *md);
143
144/*
145 * Internal suspend and resume methods.
146 */
147int dm_suspended_internally_md(struct mapped_device *md);
148void dm_internal_suspend_fast(struct mapped_device *md);
149void dm_internal_resume_fast(struct mapped_device *md);
150void dm_internal_suspend_noflush(struct mapped_device *md);
151void dm_internal_resume(struct mapped_device *md);
152
153/*
154 * Test if the device is scheduled for deferred remove.
155 */
156int dm_test_deferred_remove_flag(struct mapped_device *md);
157
158/*
159 * Try to remove devices marked for deferred removal.
160 */
161void dm_deferred_remove(void);
162
163/*
164 * The device-mapper can be driven through one of two interfaces;
165 * ioctl or filesystem, depending which patch you have applied.
166 */
167int dm_interface_init(void);
168void dm_interface_exit(void);
169
170/*
171 * sysfs interface
172 */
173int dm_sysfs_init(struct mapped_device *md);
174void dm_sysfs_exit(struct mapped_device *md);
175struct kobject *dm_kobject(struct mapped_device *md);
176struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
177
178/*
179 * The kobject helper
180 */
181void dm_kobject_release(struct kobject *kobj);
182
183/*
184 * Targets for linear and striped mappings
185 */
186int dm_linear_init(void);
187void dm_linear_exit(void);
188
189int dm_stripe_init(void);
190void dm_stripe_exit(void);
191
192/*
193 * mapped_device operations
194 */
195void dm_destroy(struct mapped_device *md);
196void dm_destroy_immediate(struct mapped_device *md);
197int dm_open_count(struct mapped_device *md);
198int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
199int dm_cancel_deferred_remove(struct mapped_device *md);
200int dm_request_based(struct mapped_device *md);
201int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
202 struct dm_dev **result);
203void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
204
205int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
206 unsigned cookie);
207
208void dm_internal_suspend(struct mapped_device *md);
209void dm_internal_resume(struct mapped_device *md);
210
211int dm_io_init(void);
212void dm_io_exit(void);
213
214int dm_kcopyd_init(void);
215void dm_kcopyd_exit(void);
216
217/*
218 * Mempool operations
219 */
220void dm_free_md_mempools(struct dm_md_mempools *pools);
221
222/*
223 * Various helpers
224 */
225unsigned dm_get_reserved_bio_based_ios(void);
226
227#endif