tjh.dev
Linux kernel mirror (for testing)
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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_get_target(struct dm_table *t, unsigned int index);
57struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
58bool dm_table_has_no_data_devices(struct dm_table *table);
59int dm_calculate_queue_limits(struct dm_table *table,
60 struct queue_limits *limits);
61int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
62 struct queue_limits *limits);
63struct list_head *dm_table_get_devices(struct dm_table *t);
64void dm_table_presuspend_targets(struct dm_table *t);
65void dm_table_presuspend_undo_targets(struct dm_table *t);
66void dm_table_postsuspend_targets(struct dm_table *t);
67int dm_table_resume_targets(struct dm_table *t);
68enum dm_queue_mode dm_table_get_type(struct dm_table *t);
69struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
70struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
71struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
72bool dm_table_bio_based(struct dm_table *t);
73bool dm_table_request_based(struct dm_table *t);
74void dm_table_free_md_mempools(struct dm_table *t);
75struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
76bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
77 int *blocksize);
78int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
79 sector_t start, sector_t len, void *data);
80
81void dm_lock_md_type(struct mapped_device *md);
82void dm_unlock_md_type(struct mapped_device *md);
83void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
84enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
85struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
86
87int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
88
89/*
90 * To check whether the target type is bio-based or not (request-based).
91 */
92#define dm_target_bio_based(t) ((t)->type->map != NULL)
93
94/*
95 * To check whether the target type is request-based or not (bio-based).
96 */
97#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
98
99/*
100 * To check whether the target type is a hybrid (capable of being
101 * either request-based or bio-based).
102 */
103#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
104
105/*
106 * Zoned targets related functions.
107 */
108int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
109void dm_zone_endio(struct dm_io *io, struct bio *clone);
110#ifdef CONFIG_BLK_DEV_ZONED
111void dm_cleanup_zoned_dev(struct mapped_device *md);
112int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
113 unsigned int nr_zones, report_zones_cb cb, void *data);
114bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
115int dm_zone_map_bio(struct dm_target_io *io);
116#else
117static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
118#define dm_blk_report_zones NULL
119static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
120{
121 return false;
122}
123static inline int dm_zone_map_bio(struct dm_target_io *tio)
124{
125 return DM_MAPIO_KILL;
126}
127#endif
128
129/*-----------------------------------------------------------------
130 * A registry of target types.
131 *---------------------------------------------------------------*/
132int dm_target_init(void);
133void dm_target_exit(void);
134struct target_type *dm_get_target_type(const char *name);
135void dm_put_target_type(struct target_type *tt);
136int dm_target_iterate(void (*iter_func)(struct target_type *tt,
137 void *param), void *param);
138
139int dm_split_args(int *argc, char ***argvp, char *input);
140
141/*
142 * Is this mapped_device being deleted?
143 */
144int dm_deleting_md(struct mapped_device *md);
145
146/*
147 * Is this mapped_device suspended?
148 */
149int dm_suspended_md(struct mapped_device *md);
150
151/*
152 * Internal suspend and resume methods.
153 */
154int dm_suspended_internally_md(struct mapped_device *md);
155void dm_internal_suspend_fast(struct mapped_device *md);
156void dm_internal_resume_fast(struct mapped_device *md);
157void dm_internal_suspend_noflush(struct mapped_device *md);
158void dm_internal_resume(struct mapped_device *md);
159
160/*
161 * Test if the device is scheduled for deferred remove.
162 */
163int dm_test_deferred_remove_flag(struct mapped_device *md);
164
165/*
166 * Try to remove devices marked for deferred removal.
167 */
168void dm_deferred_remove(void);
169
170/*
171 * The device-mapper can be driven through one of two interfaces;
172 * ioctl or filesystem, depending which patch you have applied.
173 */
174int dm_interface_init(void);
175void dm_interface_exit(void);
176
177/*
178 * sysfs interface
179 */
180int dm_sysfs_init(struct mapped_device *md);
181void dm_sysfs_exit(struct mapped_device *md);
182struct kobject *dm_kobject(struct mapped_device *md);
183struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
184
185/*
186 * The kobject helper
187 */
188void dm_kobject_release(struct kobject *kobj);
189
190/*
191 * Targets for linear and striped mappings
192 */
193int dm_linear_init(void);
194void dm_linear_exit(void);
195
196int dm_stripe_init(void);
197void dm_stripe_exit(void);
198
199/*
200 * mapped_device operations
201 */
202void dm_destroy(struct mapped_device *md);
203void dm_destroy_immediate(struct mapped_device *md);
204int dm_open_count(struct mapped_device *md);
205int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
206int dm_cancel_deferred_remove(struct mapped_device *md);
207int dm_request_based(struct mapped_device *md);
208int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
209 struct dm_dev **result);
210void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
211
212int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
213 unsigned cookie);
214
215void dm_internal_suspend(struct mapped_device *md);
216void dm_internal_resume(struct mapped_device *md);
217
218int dm_io_init(void);
219void dm_io_exit(void);
220
221int dm_kcopyd_init(void);
222void dm_kcopyd_exit(void);
223
224/*
225 * Mempool operations
226 */
227struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
228 unsigned integrity, unsigned per_bio_data_size,
229 unsigned min_pool_size);
230void dm_free_md_mempools(struct dm_md_mempools *pools);
231
232/*
233 * Various helpers
234 */
235unsigned dm_get_reserved_bio_based_ios(void);
236
237#endif