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>
20 * Suspend feature flags
22 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
23 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
26 * Type of table and mapped_device's mempool
28 #define DM_TYPE_NONE 0
29 #define DM_TYPE_BIO_BASED 1
30 #define DM_TYPE_REQUEST_BASED 2
33 * List of devices that a metadevice uses and should open/close.
35 struct dm_dev_internal {
36 struct list_head list;
42 struct dm_md_mempools;
44 /*-----------------------------------------------------------------
45 * Internal table functions.
46 *---------------------------------------------------------------*/
47 void dm_table_destroy(struct dm_table *t);
48 void dm_table_event_callback(struct dm_table *t,
49 void (*fn)(void *), void *context);
50 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
51 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
52 int dm_calculate_queue_limits(struct dm_table *table,
53 struct queue_limits *limits);
54 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
55 struct queue_limits *limits);
56 struct list_head *dm_table_get_devices(struct dm_table *t);
57 void dm_table_presuspend_targets(struct dm_table *t);
58 void dm_table_postsuspend_targets(struct dm_table *t);
59 int dm_table_resume_targets(struct dm_table *t);
60 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
61 int dm_table_any_busy_target(struct dm_table *t);
62 int dm_table_set_type(struct dm_table *t);
63 unsigned dm_table_get_type(struct dm_table *t);
64 bool dm_table_request_based(struct dm_table *t);
65 int dm_table_alloc_md_mempools(struct dm_table *t);
66 void dm_table_free_md_mempools(struct dm_table *t);
67 struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
69 void dm_lock_md_type(struct mapped_device *md);
70 void dm_unlock_md_type(struct mapped_device *md);
71 void dm_set_md_type(struct mapped_device *md, unsigned type);
72 unsigned dm_get_md_type(struct mapped_device *md);
75 * To check the return value from dm_table_find_target().
77 #define dm_target_is_valid(t) ((t)->table)
80 * To check whether the target type is request-based or not (bio-based).
82 #define dm_target_request_based(t) ((t)->type->map_rq != NULL)
84 /*-----------------------------------------------------------------
85 * A registry of target types.
86 *---------------------------------------------------------------*/
87 int dm_target_init(void);
88 void dm_target_exit(void);
89 struct target_type *dm_get_target_type(const char *name);
90 void dm_put_target_type(struct target_type *tt);
91 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
92 void *param), void *param);
94 int dm_split_args(int *argc, char ***argvp, char *input);
97 * Is this mapped_device being deleted?
99 int dm_deleting_md(struct mapped_device *md);
102 * Is this mapped_device suspended?
104 int dm_suspended_md(struct mapped_device *md);
107 * The device-mapper can be driven through one of two interfaces;
108 * ioctl or filesystem, depending which patch you have applied.
110 int dm_interface_init(void);
111 void dm_interface_exit(void);
116 int dm_sysfs_init(struct mapped_device *md);
117 void dm_sysfs_exit(struct mapped_device *md);
118 struct kobject *dm_kobject(struct mapped_device *md);
119 struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
122 * Targets for linear and striped mappings
124 int dm_linear_init(void);
125 void dm_linear_exit(void);
127 int dm_stripe_init(void);
128 void dm_stripe_exit(void);
131 * mapped_device operations
133 void dm_destroy(struct mapped_device *md);
134 void dm_destroy_immediate(struct mapped_device *md);
135 int dm_open_count(struct mapped_device *md);
136 int dm_lock_for_deletion(struct mapped_device *md);
138 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
141 int dm_io_init(void);
142 void dm_io_exit(void);
144 int dm_kcopyd_init(void);
145 void dm_kcopyd_exit(void);
150 struct dm_md_mempools *dm_alloc_md_mempools(unsigned type);
151 void dm_free_md_mempools(struct dm_md_mempools *pools);