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 *---------------------------------------------------------------
53 * Internal table functions.
54 *---------------------------------------------------------------
55 */
56void dm_table_event_callback(struct dm_table *t,
57 void (*fn)(void *), void *context);
58struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
59bool dm_table_has_no_data_devices(struct dm_table *table);
60int dm_calculate_queue_limits(struct dm_table *table,
61 struct queue_limits *limits);
62int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
63 struct queue_limits *limits);
64struct list_head *dm_table_get_devices(struct dm_table *t);
65void dm_table_presuspend_targets(struct dm_table *t);
66void dm_table_presuspend_undo_targets(struct dm_table *t);
67void dm_table_postsuspend_targets(struct dm_table *t);
68int dm_table_resume_targets(struct dm_table *t);
69enum dm_queue_mode dm_table_get_type(struct dm_table *t);
70struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
71struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
72struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
73bool dm_table_bio_based(struct dm_table *t);
74bool dm_table_request_based(struct dm_table *t);
75
76void dm_lock_md_type(struct mapped_device *md);
77void dm_unlock_md_type(struct mapped_device *md);
78void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
79enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
80struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
81
82int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
83
84/*
85 * To check whether the target type is bio-based or not (request-based).
86 */
87#define dm_target_bio_based(t) ((t)->type->map != NULL)
88
89/*
90 * To check whether the target type is request-based or not (bio-based).
91 */
92#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
93
94/*
95 * To check whether the target type is a hybrid (capable of being
96 * either request-based or bio-based).
97 */
98#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
99
100/*
101 * Zoned targets related functions.
102 */
103int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
104void dm_zone_endio(struct dm_io *io, struct bio *clone);
105#ifdef CONFIG_BLK_DEV_ZONED
106void dm_cleanup_zoned_dev(struct mapped_device *md);
107int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
108 unsigned int nr_zones, report_zones_cb cb, void *data);
109bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
110int dm_zone_map_bio(struct dm_target_io *io);
111#else
112static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
113#define dm_blk_report_zones NULL
114static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
115{
116 return false;
117}
118static inline int dm_zone_map_bio(struct dm_target_io *tio)
119{
120 return DM_MAPIO_KILL;
121}
122#endif
123
124/*
125 *---------------------------------------------------------------
126 * A registry of target types.
127 *---------------------------------------------------------------
128 */
129int dm_target_init(void);
130void dm_target_exit(void);
131struct target_type *dm_get_target_type(const char *name);
132void dm_put_target_type(struct target_type *tt);
133int dm_target_iterate(void (*iter_func)(struct target_type *tt,
134 void *param), void *param);
135
136int dm_split_args(int *argc, char ***argvp, char *input);
137
138/*
139 * Is this mapped_device being deleted?
140 */
141int dm_deleting_md(struct mapped_device *md);
142
143/*
144 * Is this mapped_device suspended?
145 */
146int dm_suspended_md(struct mapped_device *md);
147
148/*
149 * Internal suspend and resume methods.
150 */
151int dm_suspended_internally_md(struct mapped_device *md);
152void dm_internal_suspend_fast(struct mapped_device *md);
153void dm_internal_resume_fast(struct mapped_device *md);
154void dm_internal_suspend_noflush(struct mapped_device *md);
155void dm_internal_resume(struct mapped_device *md);
156
157/*
158 * Test if the device is scheduled for deferred remove.
159 */
160int dm_test_deferred_remove_flag(struct mapped_device *md);
161
162/*
163 * Try to remove devices marked for deferred removal.
164 */
165void dm_deferred_remove(void);
166
167/*
168 * The device-mapper can be driven through one of two interfaces;
169 * ioctl or filesystem, depending which patch you have applied.
170 */
171int dm_interface_init(void);
172void dm_interface_exit(void);
173
174/*
175 * sysfs interface
176 */
177int dm_sysfs_init(struct mapped_device *md);
178void dm_sysfs_exit(struct mapped_device *md);
179struct kobject *dm_kobject(struct mapped_device *md);
180struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
181
182/*
183 * The kobject helper
184 */
185void dm_kobject_release(struct kobject *kobj);
186
187/*
188 * Targets for linear and striped mappings
189 */
190int dm_linear_init(void);
191void dm_linear_exit(void);
192
193int dm_stripe_init(void);
194void dm_stripe_exit(void);
195
196/*
197 * mapped_device operations
198 */
199void dm_destroy(struct mapped_device *md);
200void dm_destroy_immediate(struct mapped_device *md);
201int dm_open_count(struct mapped_device *md);
202int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
203int dm_cancel_deferred_remove(struct mapped_device *md);
204int dm_request_based(struct mapped_device *md);
205int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
206 struct dm_dev **result);
207void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
208
209int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
210 unsigned int cookie, bool need_resize_uevent);
211
212void dm_internal_suspend(struct mapped_device *md);
213void dm_internal_resume(struct mapped_device *md);
214
215int dm_io_init(void);
216void dm_io_exit(void);
217
218int dm_kcopyd_init(void);
219void dm_kcopyd_exit(void);
220
221/*
222 * Mempool operations
223 */
224void dm_free_md_mempools(struct dm_md_mempools *pools);
225
226/*
227 * Various helpers
228 */
229unsigned int dm_get_reserved_bio_based_ios(void);
230
231#endif