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);
 66enum dm_queue_mode dm_table_get_type(struct dm_table *t);
 
 67struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
 68struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
 69struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
 70bool dm_table_bio_based(struct dm_table *t);
 71bool dm_table_request_based(struct dm_table *t);
 
 72void dm_table_free_md_mempools(struct dm_table *t);
 73struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
 74bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
 75			   int *blocksize);
 76int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
 77			   sector_t start, sector_t len, void *data);
 78
 79void dm_lock_md_type(struct mapped_device *md);
 80void dm_unlock_md_type(struct mapped_device *md);
 81void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
 82enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
 83struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
 84
 85int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
 86
 87/*
 
 
 
 
 
 88 * To check whether the target type is bio-based or not (request-based).
 89 */
 90#define dm_target_bio_based(t) ((t)->type->map != NULL)
 91
 92/*
 93 * To check whether the target type is request-based or not (bio-based).
 94 */
 95#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
 
 96
 97/*
 98 * To check whether the target type is a hybrid (capable of being
 99 * either request-based or bio-based).
100 */
101#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
102
103/*-----------------------------------------------------------------
104 * A registry of target types.
105 *---------------------------------------------------------------*/
106int dm_target_init(void);
107void dm_target_exit(void);
108struct target_type *dm_get_target_type(const char *name);
109void dm_put_target_type(struct target_type *tt);
110int dm_target_iterate(void (*iter_func)(struct target_type *tt,
111					void *param), void *param);
112
113int dm_split_args(int *argc, char ***argvp, char *input);
114
115/*
116 * Is this mapped_device being deleted?
117 */
118int dm_deleting_md(struct mapped_device *md);
119
120/*
121 * Is this mapped_device suspended?
122 */
123int dm_suspended_md(struct mapped_device *md);
124
125/*
126 * Internal suspend and resume methods.
127 */
128int dm_suspended_internally_md(struct mapped_device *md);
129void dm_internal_suspend_fast(struct mapped_device *md);
130void dm_internal_resume_fast(struct mapped_device *md);
131void dm_internal_suspend_noflush(struct mapped_device *md);
132void dm_internal_resume(struct mapped_device *md);
133
134/*
135 * Test if the device is scheduled for deferred remove.
136 */
137int dm_test_deferred_remove_flag(struct mapped_device *md);
138
139/*
140 * Try to remove devices marked for deferred removal.
141 */
142void dm_deferred_remove(void);
143
144/*
145 * The device-mapper can be driven through one of two interfaces;
146 * ioctl or filesystem, depending which patch you have applied.
147 */
148int dm_interface_init(void);
149void dm_interface_exit(void);
150
151/*
152 * sysfs interface
153 */
 
 
 
 
 
 
 
 
 
 
154int dm_sysfs_init(struct mapped_device *md);
155void dm_sysfs_exit(struct mapped_device *md);
156struct kobject *dm_kobject(struct mapped_device *md);
157struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
158
159/*
160 * The kobject helper
161 */
162void dm_kobject_release(struct kobject *kobj);
163
164/*
165 * Targets for linear and striped mappings
166 */
167int dm_linear_init(void);
168void dm_linear_exit(void);
169
170int dm_stripe_init(void);
171void dm_stripe_exit(void);
172
173/*
174 * mapped_device operations
175 */
176void dm_destroy(struct mapped_device *md);
177void dm_destroy_immediate(struct mapped_device *md);
178int dm_open_count(struct mapped_device *md);
179int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
180int dm_cancel_deferred_remove(struct mapped_device *md);
181int dm_request_based(struct mapped_device *md);
182sector_t dm_get_size(struct mapped_device *md);
183struct request_queue *dm_get_md_queue(struct mapped_device *md);
184int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
185			struct dm_dev **result);
186void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
187struct dm_stats *dm_get_stats(struct mapped_device *md);
188
189int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
190		      unsigned cookie);
191
192void dm_internal_suspend(struct mapped_device *md);
193void dm_internal_resume(struct mapped_device *md);
194
 
 
195int dm_io_init(void);
196void dm_io_exit(void);
197
198int dm_kcopyd_init(void);
199void dm_kcopyd_exit(void);
200
201/*
202 * Mempool operations
203 */
204struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
205					    unsigned integrity, unsigned per_bio_data_size,
206					    unsigned min_pool_size);
207void dm_free_md_mempools(struct dm_md_mempools *pools);
208
209/*
210 * Various helpers
211 */
212unsigned dm_get_reserved_bio_based_ios(void);
 
 
 
 
 
 
 
 
 
 
213
214#endif

  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/backing-dev.h>
 18#include <linux/hdreg.h>
 19#include <linux/completion.h>
 20#include <linux/kobject.h>
 
 21
 22#include "dm-stats.h"
 23
 24/*
 25 * Suspend feature flags
 26 */
 27#define DM_SUSPEND_LOCKFS_FLAG		(1 << 0)
 28#define DM_SUSPEND_NOFLUSH_FLAG		(1 << 1)
 29
 30/*
 31 * Status feature flags
 32 */
 33#define DM_STATUS_NOFLUSH_FLAG		(1 << 0)
 34
 35/*
 36 * Type of table and mapped_device's mempool
 37 */
 38#define DM_TYPE_NONE			0
 39#define DM_TYPE_BIO_BASED		1
 40#define DM_TYPE_REQUEST_BASED		2
 41#define DM_TYPE_MQ_REQUEST_BASED	3
 42
 43/*
 44 * List of devices that a metadevice uses and should open/close.
 45 */
 46struct dm_dev_internal {
 47	struct list_head list;
 48	atomic_t count;
 49	struct dm_dev *dm_dev;
 50};
 51
 52struct dm_table;
 53struct dm_md_mempools;
 54
 55/*-----------------------------------------------------------------
 56 * Internal table functions.
 57 *---------------------------------------------------------------*/
 58void dm_table_destroy(struct dm_table *t);
 59void dm_table_event_callback(struct dm_table *t,
 60			     void (*fn)(void *), void *context);
 61struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
 62struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
 63bool dm_table_has_no_data_devices(struct dm_table *table);
 64int dm_calculate_queue_limits(struct dm_table *table,
 65			      struct queue_limits *limits);
 66void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 67			       struct queue_limits *limits);
 68struct list_head *dm_table_get_devices(struct dm_table *t);
 69void dm_table_presuspend_targets(struct dm_table *t);
 70void dm_table_presuspend_undo_targets(struct dm_table *t);
 71void dm_table_postsuspend_targets(struct dm_table *t);
 72int dm_table_resume_targets(struct dm_table *t);
 73int dm_table_any_congested(struct dm_table *t, int bdi_bits);
 74unsigned dm_table_get_type(struct dm_table *t);
 75struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
 76struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
 77struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
 
 78bool dm_table_request_based(struct dm_table *t);
 79bool dm_table_mq_request_based(struct dm_table *t);
 80void dm_table_free_md_mempools(struct dm_table *t);
 81struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
 
 
 
 
 82
 83void dm_lock_md_type(struct mapped_device *md);
 84void dm_unlock_md_type(struct mapped_device *md);
 85void dm_set_md_type(struct mapped_device *md, unsigned type);
 86unsigned dm_get_md_type(struct mapped_device *md);
 87struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
 88
 89int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
 90
 91/*
 92 * To check the return value from dm_table_find_target().
 93 */
 94#define dm_target_is_valid(t) ((t)->table)
 95
 96/*
 97 * To check whether the target type is bio-based or not (request-based).
 98 */
 99#define dm_target_bio_based(t) ((t)->type->map != NULL)
100
101/*
102 * To check whether the target type is request-based or not (bio-based).
103 */
104#define dm_target_request_based(t) (((t)->type->map_rq != NULL) || \
105				    ((t)->type->clone_and_map_rq != NULL))
106
107/*
108 * To check whether the target type is a hybrid (capable of being
109 * either request-based or bio-based).
110 */
111#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
112
113/*-----------------------------------------------------------------
114 * A registry of target types.
115 *---------------------------------------------------------------*/
116int dm_target_init(void);
117void dm_target_exit(void);
118struct target_type *dm_get_target_type(const char *name);
119void dm_put_target_type(struct target_type *tt);
120int dm_target_iterate(void (*iter_func)(struct target_type *tt,
121					void *param), void *param);
122
123int dm_split_args(int *argc, char ***argvp, char *input);
124
125/*
126 * Is this mapped_device being deleted?
127 */
128int dm_deleting_md(struct mapped_device *md);
129
130/*
131 * Is this mapped_device suspended?
132 */
133int dm_suspended_md(struct mapped_device *md);
134
135/*
136 * Internal suspend and resume methods.
137 */
138int dm_suspended_internally_md(struct mapped_device *md);
139void dm_internal_suspend_fast(struct mapped_device *md);
140void dm_internal_resume_fast(struct mapped_device *md);
141void dm_internal_suspend_noflush(struct mapped_device *md);
142void dm_internal_resume(struct mapped_device *md);
143
144/*
145 * Test if the device is scheduled for deferred remove.
146 */
147int dm_test_deferred_remove_flag(struct mapped_device *md);
148
149/*
150 * Try to remove devices marked for deferred removal.
151 */
152void dm_deferred_remove(void);
153
154/*
155 * The device-mapper can be driven through one of two interfaces;
156 * ioctl or filesystem, depending which patch you have applied.
157 */
158int dm_interface_init(void);
159void dm_interface_exit(void);
160
161/*
162 * sysfs interface
163 */
164struct dm_kobject_holder {
165	struct kobject kobj;
166	struct completion completion;
167};
168
169static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
170{
171	return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;
172}
173
174int dm_sysfs_init(struct mapped_device *md);
175void dm_sysfs_exit(struct mapped_device *md);
176struct kobject *dm_kobject(struct mapped_device *md);
177struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
178
179/*
180 * The kobject helper
181 */
182void dm_kobject_release(struct kobject *kobj);
183
184/*
185 * Targets for linear and striped mappings
186 */
187int dm_linear_init(void);
188void dm_linear_exit(void);
189
190int dm_stripe_init(void);
191void dm_stripe_exit(void);
192
193/*
194 * mapped_device operations
195 */
196void dm_destroy(struct mapped_device *md);
197void dm_destroy_immediate(struct mapped_device *md);
198int dm_open_count(struct mapped_device *md);
199int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
200int dm_cancel_deferred_remove(struct mapped_device *md);
201int dm_request_based(struct mapped_device *md);
202sector_t dm_get_size(struct mapped_device *md);
203struct request_queue *dm_get_md_queue(struct mapped_device *md);
204int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
205			struct dm_dev **result);
206void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
207struct dm_stats *dm_get_stats(struct mapped_device *md);
208
209int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
210		      unsigned cookie);
211
212void dm_internal_suspend(struct mapped_device *md);
213void dm_internal_resume(struct mapped_device *md);
214
215bool dm_use_blk_mq(struct mapped_device *md);
216
217int dm_io_init(void);
218void dm_io_exit(void);
219
220int dm_kcopyd_init(void);
221void dm_kcopyd_exit(void);
222
223/*
224 * Mempool operations
225 */
226struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
227					    unsigned integrity, unsigned per_bio_data_size);
 
228void dm_free_md_mempools(struct dm_md_mempools *pools);
229
230/*
231 * Helpers that are used by DM core
232 */
233unsigned dm_get_reserved_bio_based_ios(void);
234unsigned dm_get_reserved_rq_based_ios(void);
235
236static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
237{
238	return !maxlen || strlen(result) + 1 >= maxlen;
239}
240
241ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf);
242ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md,
243						     const char *buf, size_t count);
244
245#endif