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/hdreg.h>
 
 
 
 
 18
 19/*
 20 * Suspend feature flags
 21 */
 22#define DM_SUSPEND_LOCKFS_FLAG		(1 << 0)
 23#define DM_SUSPEND_NOFLUSH_FLAG		(1 << 1)
 24
 25/*
 
 
 
 
 
 26 * Type of table and mapped_device's mempool
 27 */
 28#define DM_TYPE_NONE		0
 29#define DM_TYPE_BIO_BASED	1
 30#define DM_TYPE_REQUEST_BASED	2
 
 31
 32/*
 33 * List of devices that a metadevice uses and should open/close.
 34 */
 35struct dm_dev_internal {
 36	struct list_head list;
 37	atomic_t count;
 38	struct dm_dev dm_dev;
 39};
 40
 41struct dm_table;
 42struct dm_md_mempools;
 43
 44/*-----------------------------------------------------------------
 45 * Internal table functions.
 46 *---------------------------------------------------------------*/
 47void dm_table_destroy(struct dm_table *t);
 48void dm_table_event_callback(struct dm_table *t,
 49			     void (*fn)(void *), void *context);
 50struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
 51struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
 
 52int dm_calculate_queue_limits(struct dm_table *table,
 53			      struct queue_limits *limits);
 54void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 55			       struct queue_limits *limits);
 56struct list_head *dm_table_get_devices(struct dm_table *t);
 57void dm_table_presuspend_targets(struct dm_table *t);
 
 58void dm_table_postsuspend_targets(struct dm_table *t);
 59int dm_table_resume_targets(struct dm_table *t);
 60int dm_table_any_congested(struct dm_table *t, int bdi_bits);
 61int dm_table_any_busy_target(struct dm_table *t);
 62unsigned dm_table_get_type(struct dm_table *t);
 
 
 
 63bool dm_table_request_based(struct dm_table *t);
 64bool dm_table_supports_discards(struct dm_table *t);
 65int dm_table_alloc_md_mempools(struct dm_table *t);
 66void dm_table_free_md_mempools(struct dm_table *t);
 67struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
 68
 69int dm_queue_merge_is_compulsory(struct request_queue *q);
 70
 71void dm_lock_md_type(struct mapped_device *md);
 72void dm_unlock_md_type(struct mapped_device *md);
 73void dm_set_md_type(struct mapped_device *md, unsigned type);
 74unsigned dm_get_md_type(struct mapped_device *md);
 
 75
 76int dm_setup_md_queue(struct mapped_device *md);
 77
 78/*
 79 * To check the return value from dm_table_find_target().
 80 */
 81#define dm_target_is_valid(t) ((t)->table)
 82
 83/*
 
 
 
 
 
 84 * To check whether the target type is request-based or not (bio-based).
 85 */
 86#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
 
 
 
 
 
 
 
 87
 88/*-----------------------------------------------------------------
 89 * A registry of target types.
 90 *---------------------------------------------------------------*/
 91int dm_target_init(void);
 92void dm_target_exit(void);
 93struct target_type *dm_get_target_type(const char *name);
 94void dm_put_target_type(struct target_type *tt);
 95int dm_target_iterate(void (*iter_func)(struct target_type *tt,
 96					void *param), void *param);
 97
 98int dm_split_args(int *argc, char ***argvp, char *input);
 99
100/*
101 * Is this mapped_device being deleted?
102 */
103int dm_deleting_md(struct mapped_device *md);
104
105/*
106 * Is this mapped_device suspended?
107 */
108int dm_suspended_md(struct mapped_device *md);
109
110/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
111 * The device-mapper can be driven through one of two interfaces;
112 * ioctl or filesystem, depending which patch you have applied.
113 */
114int dm_interface_init(void);
115void dm_interface_exit(void);
116
117/*
118 * sysfs interface
119 */
 
 
 
 
 
 
 
 
 
 
120int dm_sysfs_init(struct mapped_device *md);
121void dm_sysfs_exit(struct mapped_device *md);
122struct kobject *dm_kobject(struct mapped_device *md);
123struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
124
125/*
 
 
 
 
 
126 * Targets for linear and striped mappings
127 */
128int dm_linear_init(void);
129void dm_linear_exit(void);
130
131int dm_stripe_init(void);
132void dm_stripe_exit(void);
133
134/*
135 * mapped_device operations
136 */
137void dm_destroy(struct mapped_device *md);
138void dm_destroy_immediate(struct mapped_device *md);
139int dm_open_count(struct mapped_device *md);
140int dm_lock_for_deletion(struct mapped_device *md);
 
 
 
 
 
 
 
 
141
142int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
143		      unsigned cookie);
144
 
 
 
 
 
145int dm_io_init(void);
146void dm_io_exit(void);
147
148int dm_kcopyd_init(void);
149void dm_kcopyd_exit(void);
150
151/*
152 * Mempool operations
153 */
154struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity);
 
155void dm_free_md_mempools(struct dm_md_mempools *pools);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
156
157#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