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 unsigned dm_table_get_type(struct dm_table
*t
);
63 bool dm_table_request_based(struct dm_table
*t
);
64 bool dm_table_supports_discards(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
);
74 int dm_setup_md_queue(struct mapped_device
*md
);
77 * To check the return value from dm_table_find_target().
79 #define dm_target_is_valid(t) ((t)->table)
82 * To check whether the target type is request-based or not (bio-based).
84 #define dm_target_request_based(t) ((t)->type->map_rq != NULL)
86 /*-----------------------------------------------------------------
87 * A registry of target types.
88 *---------------------------------------------------------------*/
89 int dm_target_init(void);
90 void dm_target_exit(void);
91 struct target_type
*dm_get_target_type(const char *name
);
92 void dm_put_target_type(struct target_type
*tt
);
93 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
94 void *param
), void *param
);
96 int dm_split_args(int *argc
, char ***argvp
, char *input
);
99 * Is this mapped_device being deleted?
101 int dm_deleting_md(struct mapped_device
*md
);
104 * Is this mapped_device suspended?
106 int dm_suspended_md(struct mapped_device
*md
);
109 * The device-mapper can be driven through one of two interfaces;
110 * ioctl or filesystem, depending which patch you have applied.
112 int dm_interface_init(void);
113 void dm_interface_exit(void);
118 int dm_sysfs_init(struct mapped_device
*md
);
119 void dm_sysfs_exit(struct mapped_device
*md
);
120 struct kobject
*dm_kobject(struct mapped_device
*md
);
121 struct mapped_device
*dm_get_from_kobject(struct kobject
*kobj
);
124 * Targets for linear and striped mappings
126 int dm_linear_init(void);
127 void dm_linear_exit(void);
129 int dm_stripe_init(void);
130 void dm_stripe_exit(void);
133 * mapped_device operations
135 void dm_destroy(struct mapped_device
*md
);
136 void dm_destroy_immediate(struct mapped_device
*md
);
137 int dm_open_count(struct mapped_device
*md
);
138 int dm_lock_for_deletion(struct mapped_device
*md
);
140 int dm_kobject_uevent(struct mapped_device
*md
, enum kobject_action action
,
143 int dm_io_init(void);
144 void dm_io_exit(void);
146 int dm_kcopyd_init(void);
147 void dm_kcopyd_exit(void);
152 struct dm_md_mempools
*dm_alloc_md_mempools(unsigned type
);
153 void dm_free_md_mempools(struct dm_md_mempools
*pools
);
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