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;
48
49/*-----------------------------------------------------------------
50 * Internal table functions.
51 *---------------------------------------------------------------*/
52void dm_table_event_callback(struct dm_table *t,
53 void (*fn)(void *), void *context);
54struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
55struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
56bool dm_table_has_no_data_devices(struct dm_table *table);
57int dm_calculate_queue_limits(struct dm_table *table,
58 struct queue_limits *limits);
59void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
60 struct queue_limits *limits);
61struct list_head *dm_table_get_devices(struct dm_table *t);
62void dm_table_presuspend_targets(struct dm_table *t);
63void dm_table_presuspend_undo_targets(struct dm_table *t);
64void dm_table_postsuspend_targets(struct dm_table *t);
65int dm_table_resume_targets(struct dm_table *t);
66int dm_table_any_congested(struct dm_table *t, int bdi_bits);
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);
73void dm_table_free_md_mempools(struct dm_table *t);
74struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
75bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
76 int *blocksize);
77int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
78 sector_t start, sector_t len, void *data);
79
80void dm_lock_md_type(struct mapped_device *md);
81void dm_unlock_md_type(struct mapped_device *md);
82void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
83enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
84struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
85
86int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
87
88/*
89 * To check whether the target type is bio-based or not (request-based).
90 */
91#define dm_target_bio_based(t) ((t)->type->map != NULL)
92
93/*
94 * To check whether the target type is request-based or not (bio-based).
95 */
96#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
97
98/*
99 * To check whether the target type is a hybrid (capable of being
100 * either request-based or bio-based).
101 */
102#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
103
104/*-----------------------------------------------------------------
105 * A registry of target types.
106 *---------------------------------------------------------------*/
107int dm_target_init(void);
108void dm_target_exit(void);
109struct target_type *dm_get_target_type(const char *name);
110void dm_put_target_type(struct target_type *tt);
111int dm_target_iterate(void (*iter_func)(struct target_type *tt,
112 void *param), void *param);
113
114int dm_split_args(int *argc, char ***argvp, char *input);
115
116/*
117 * Is this mapped_device being deleted?
118 */
119int dm_deleting_md(struct mapped_device *md);
120
121/*
122 * Is this mapped_device suspended?
123 */
124int dm_suspended_md(struct mapped_device *md);
125
126/*
127 * Internal suspend and resume methods.
128 */
129int dm_suspended_internally_md(struct mapped_device *md);
130void dm_internal_suspend_fast(struct mapped_device *md);
131void dm_internal_resume_fast(struct mapped_device *md);
132void dm_internal_suspend_noflush(struct mapped_device *md);
133void dm_internal_resume(struct mapped_device *md);
134
135/*
136 * Test if the device is scheduled for deferred remove.
137 */
138int dm_test_deferred_remove_flag(struct mapped_device *md);
139
140/*
141 * Try to remove devices marked for deferred removal.
142 */
143void dm_deferred_remove(void);
144
145/*
146 * The device-mapper can be driven through one of two interfaces;
147 * ioctl or filesystem, depending which patch you have applied.
148 */
149int dm_interface_init(void);
150void dm_interface_exit(void);
151
152/*
153 * sysfs interface
154 */
155int dm_sysfs_init(struct mapped_device *md);
156void dm_sysfs_exit(struct mapped_device *md);
157struct kobject *dm_kobject(struct mapped_device *md);
158struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
159
160/*
161 * The kobject helper
162 */
163void dm_kobject_release(struct kobject *kobj);
164
165/*
166 * Targets for linear and striped mappings
167 */
168int dm_linear_init(void);
169void dm_linear_exit(void);
170
171int dm_stripe_init(void);
172void dm_stripe_exit(void);
173
174/*
175 * mapped_device operations
176 */
177void dm_destroy(struct mapped_device *md);
178void dm_destroy_immediate(struct mapped_device *md);
179int dm_open_count(struct mapped_device *md);
180int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
181int dm_cancel_deferred_remove(struct mapped_device *md);
182int dm_request_based(struct mapped_device *md);
183sector_t dm_get_size(struct mapped_device *md);
184struct request_queue *dm_get_md_queue(struct mapped_device *md);
185int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
186 struct dm_dev **result);
187void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
188struct dm_stats *dm_get_stats(struct mapped_device *md);
189
190int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
191 unsigned cookie);
192
193void dm_internal_suspend(struct mapped_device *md);
194void dm_internal_resume(struct mapped_device *md);
195
196int dm_io_init(void);
197void dm_io_exit(void);
198
199int dm_kcopyd_init(void);
200void dm_kcopyd_exit(void);
201
202/*
203 * Mempool operations
204 */
205struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
206 unsigned integrity, unsigned per_bio_data_size,
207 unsigned min_pool_size);
208void dm_free_md_mempools(struct dm_md_mempools *pools);
209
210/*
211 * Various helpers
212 */
213unsigned dm_get_reserved_bio_based_ios(void);
214
215#endif