2 * Internal header file for device mapper
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
7 * This file is released under the LGPL.
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>
26 * Suspend feature flags
28 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
29 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
32 * Status feature flags
34 #define DM_STATUS_NOFLUSH_FLAG (1 << 0)
37 * Type of table and mapped_device's mempool
39 #define DM_TYPE_NONE 0
40 #define DM_TYPE_BIO_BASED 1
41 #define DM_TYPE_REQUEST_BASED 2
42 #define DM_TYPE_MQ_REQUEST_BASED 3
45 * List of devices that a metadevice uses and should open/close.
47 struct dm_dev_internal {
48 struct list_head list;
50 struct dm_dev *dm_dev;
54 struct dm_md_mempools;
56 /*-----------------------------------------------------------------
57 * Internal table functions.
58 *---------------------------------------------------------------*/
59 void dm_table_destroy(struct dm_table *t);
60 void dm_table_event_callback(struct dm_table *t,
61 void (*fn)(void *), void *context);
62 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
63 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
64 bool dm_table_has_no_data_devices(struct dm_table *table);
65 int dm_calculate_queue_limits(struct dm_table *table,
66 struct queue_limits *limits);
67 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
68 struct queue_limits *limits);
69 struct list_head *dm_table_get_devices(struct dm_table *t);
70 void dm_table_presuspend_targets(struct dm_table *t);
71 void dm_table_presuspend_undo_targets(struct dm_table *t);
72 void dm_table_postsuspend_targets(struct dm_table *t);
73 int dm_table_resume_targets(struct dm_table *t);
74 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
75 unsigned dm_table_get_type(struct dm_table *t);
76 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
77 struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
78 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
79 bool dm_table_request_based(struct dm_table *t);
80 bool dm_table_mq_request_based(struct dm_table *t);
81 void dm_table_free_md_mempools(struct dm_table *t);
82 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
84 void dm_lock_md_type(struct mapped_device *md);
85 void dm_unlock_md_type(struct mapped_device *md);
86 void dm_set_md_type(struct mapped_device *md, unsigned type);
87 unsigned dm_get_md_type(struct mapped_device *md);
88 struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
90 int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
93 * To check the return value from dm_table_find_target().
95 #define dm_target_is_valid(t) ((t)->table)
98 * To check whether the target type is bio-based or not (request-based).
100 #define dm_target_bio_based(t) ((t)->type->map != NULL)
103 * To check whether the target type is request-based or not (bio-based).
105 #define dm_target_request_based(t) (((t)->type->map_rq != NULL) || \
106 ((t)->type->clone_and_map_rq != NULL))
109 * To check whether the target type is a hybrid (capable of being
110 * either request-based or bio-based).
112 #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
114 /*-----------------------------------------------------------------
115 * A registry of target types.
116 *---------------------------------------------------------------*/
117 int dm_target_init(void);
118 void dm_target_exit(void);
119 struct target_type *dm_get_target_type(const char *name);
120 void dm_put_target_type(struct target_type *tt);
121 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
122 void *param), void *param);
124 int dm_split_args(int *argc, char ***argvp, char *input);
127 * Is this mapped_device being deleted?
129 int dm_deleting_md(struct mapped_device *md);
132 * Is this mapped_device suspended?
134 int dm_suspended_md(struct mapped_device *md);
137 * Internal suspend and resume methods.
139 int dm_suspended_internally_md(struct mapped_device *md);
140 void dm_internal_suspend_fast(struct mapped_device *md);
141 void dm_internal_resume_fast(struct mapped_device *md);
142 void dm_internal_suspend_noflush(struct mapped_device *md);
143 void dm_internal_resume(struct mapped_device *md);
146 * Test if the device is scheduled for deferred remove.
148 int dm_test_deferred_remove_flag(struct mapped_device *md);
151 * Try to remove devices marked for deferred removal.
153 void dm_deferred_remove(void);
156 * The device-mapper can be driven through one of two interfaces;
157 * ioctl or filesystem, depending which patch you have applied.
159 int dm_interface_init(void);
160 void dm_interface_exit(void);
165 int dm_sysfs_init(struct mapped_device *md);
166 void dm_sysfs_exit(struct mapped_device *md);
167 struct kobject *dm_kobject(struct mapped_device *md);
168 struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
173 void dm_kobject_release(struct kobject *kobj);
176 * Targets for linear and striped mappings
178 int dm_linear_init(void);
179 void dm_linear_exit(void);
181 int dm_stripe_init(void);
182 void dm_stripe_exit(void);
185 * mapped_device operations
187 void dm_destroy(struct mapped_device *md);
188 void dm_destroy_immediate(struct mapped_device *md);
189 int dm_open_count(struct mapped_device *md);
190 int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
191 int dm_cancel_deferred_remove(struct mapped_device *md);
192 int dm_request_based(struct mapped_device *md);
193 sector_t dm_get_size(struct mapped_device *md);
194 struct request_queue *dm_get_md_queue(struct mapped_device *md);
195 int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
196 struct dm_dev **result);
197 void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
198 struct dm_stats *dm_get_stats(struct mapped_device *md);
200 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
203 void dm_internal_suspend(struct mapped_device *md);
204 void dm_internal_resume(struct mapped_device *md);
206 int dm_io_init(void);
207 void dm_io_exit(void);
209 int dm_kcopyd_init(void);
210 void dm_kcopyd_exit(void);
215 struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
216 unsigned integrity, unsigned per_bio_data_size);
217 void dm_free_md_mempools(struct dm_md_mempools *pools);
222 unsigned dm_get_reserved_bio_based_ios(void);