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/blkdev.h>
17 #include <linux/hdreg.h>
18 #include <linux/completion.h>
21 * Suspend feature flags
23 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
24 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
27 * Status feature flags
29 #define DM_STATUS_NOFLUSH_FLAG (1 << 0)
32 * Type of table and mapped_device's mempool
34 #define DM_TYPE_NONE 0
35 #define DM_TYPE_BIO_BASED 1
36 #define DM_TYPE_REQUEST_BASED 2
39 * List of devices that a metadevice uses and should open/close.
41 struct dm_dev_internal {
42 struct list_head list;
48 struct dm_md_mempools;
50 /*-----------------------------------------------------------------
51 * Internal table functions.
52 *---------------------------------------------------------------*/
53 void dm_table_destroy(struct dm_table *t);
54 void dm_table_event_callback(struct dm_table *t,
55 void (*fn)(void *), void *context);
56 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
57 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
58 bool dm_table_has_no_data_devices(struct dm_table *table);
59 int dm_calculate_queue_limits(struct dm_table *table,
60 struct queue_limits *limits);
61 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
62 struct queue_limits *limits);
63 struct list_head *dm_table_get_devices(struct dm_table *t);
64 void dm_table_presuspend_targets(struct dm_table *t);
65 void dm_table_postsuspend_targets(struct dm_table *t);
66 int dm_table_resume_targets(struct dm_table *t);
67 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
68 int dm_table_any_busy_target(struct dm_table *t);
69 unsigned dm_table_get_type(struct dm_table *t);
70 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
71 bool dm_table_request_based(struct dm_table *t);
72 bool dm_table_supports_discards(struct dm_table *t);
73 int dm_table_alloc_md_mempools(struct dm_table *t);
74 void dm_table_free_md_mempools(struct dm_table *t);
75 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
77 int dm_queue_merge_is_compulsory(struct request_queue *q);
79 void dm_lock_md_type(struct mapped_device *md);
80 void dm_unlock_md_type(struct mapped_device *md);
81 void dm_set_md_type(struct mapped_device *md, unsigned type);
82 unsigned dm_get_md_type(struct mapped_device *md);
83 struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
85 int dm_setup_md_queue(struct mapped_device *md);
88 * To check the return value from dm_table_find_target().
90 #define dm_target_is_valid(t) ((t)->table)
93 * To check whether the target type is request-based or not (bio-based).
95 #define dm_target_request_based(t) ((t)->type->map_rq != NULL)
97 /*-----------------------------------------------------------------
98 * A registry of target types.
99 *---------------------------------------------------------------*/
100 int dm_target_init(void);
101 void dm_target_exit(void);
102 struct target_type *dm_get_target_type(const char *name);
103 void dm_put_target_type(struct target_type *tt);
104 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
105 void *param), void *param);
107 int dm_split_args(int *argc, char ***argvp, char *input);
110 * Is this mapped_device being deleted?
112 int dm_deleting_md(struct mapped_device *md);
115 * Is this mapped_device suspended?
117 int dm_suspended_md(struct mapped_device *md);
120 * The device-mapper can be driven through one of two interfaces;
121 * ioctl or filesystem, depending which patch you have applied.
123 int dm_interface_init(void);
124 void dm_interface_exit(void);
129 int dm_sysfs_init(struct mapped_device *md);
130 void dm_sysfs_exit(struct mapped_device *md);
131 struct kobject *dm_kobject(struct mapped_device *md);
132 struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
133 struct completion *dm_get_completion_from_kobject(struct kobject *kobj);
136 * Targets for linear and striped mappings
138 int dm_linear_init(void);
139 void dm_linear_exit(void);
141 int dm_stripe_init(void);
142 void dm_stripe_exit(void);
145 * mapped_device operations
147 void dm_destroy(struct mapped_device *md);
148 void dm_destroy_immediate(struct mapped_device *md);
149 int dm_open_count(struct mapped_device *md);
150 int dm_lock_for_deletion(struct mapped_device *md);
152 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
155 int dm_io_init(void);
156 void dm_io_exit(void);
158 int dm_kcopyd_init(void);
159 void dm_kcopyd_exit(void);
164 struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size);
165 void dm_free_md_mempools(struct dm_md_mempools *pools);