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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/md/dm.h
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>
22 * Suspend feature flags
24 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
25 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
28 * Status feature flags
30 #define DM_STATUS_NOFLUSH_FLAG (1 << 0)
33 * Type of table and mapped_device's mempool
35 #define DM_TYPE_NONE 0
36 #define DM_TYPE_BIO_BASED 1
37 #define DM_TYPE_REQUEST_BASED 2
40 * List of devices that a metadevice uses and should open/close.
42 struct dm_dev_internal
{
43 struct list_head list
;
49 struct dm_md_mempools
;
51 /*-----------------------------------------------------------------
52 * Internal table functions.
53 *---------------------------------------------------------------*/
54 void dm_table_destroy(struct dm_table
*t
);
55 void dm_table_event_callback(struct dm_table
*t
,
56 void (*fn
)(void *), void *context
);
57 struct dm_target
*dm_table_get_target(struct dm_table
*t
, unsigned int index
);
58 struct dm_target
*dm_table_find_target(struct dm_table
*t
, sector_t sector
);
59 bool dm_table_has_no_data_devices(struct dm_table
*table
);
60 int dm_calculate_queue_limits(struct dm_table
*table
,
61 struct queue_limits
*limits
);
62 void dm_table_set_restrictions(struct dm_table
*t
, struct request_queue
*q
,
63 struct queue_limits
*limits
);
64 struct list_head
*dm_table_get_devices(struct dm_table
*t
);
65 void dm_table_presuspend_targets(struct dm_table
*t
);
66 void dm_table_postsuspend_targets(struct dm_table
*t
);
67 int dm_table_resume_targets(struct dm_table
*t
);
68 int dm_table_any_congested(struct dm_table
*t
, int bdi_bits
);
69 int dm_table_any_busy_target(struct dm_table
*t
);
70 unsigned dm_table_get_type(struct dm_table
*t
);
71 struct target_type
*dm_table_get_immutable_target_type(struct dm_table
*t
);
72 bool dm_table_request_based(struct dm_table
*t
);
73 bool dm_table_supports_discards(struct dm_table
*t
);
74 int dm_table_alloc_md_mempools(struct dm_table
*t
);
75 void dm_table_free_md_mempools(struct dm_table
*t
);
76 struct dm_md_mempools
*dm_table_get_md_mempools(struct dm_table
*t
);
78 int dm_queue_merge_is_compulsory(struct request_queue
*q
);
80 void dm_lock_md_type(struct mapped_device
*md
);
81 void dm_unlock_md_type(struct mapped_device
*md
);
82 void dm_set_md_type(struct mapped_device
*md
, unsigned type
);
83 unsigned dm_get_md_type(struct mapped_device
*md
);
84 struct target_type
*dm_get_immutable_target_type(struct mapped_device
*md
);
86 int dm_setup_md_queue(struct mapped_device
*md
);
89 * To check the return value from dm_table_find_target().
91 #define dm_target_is_valid(t) ((t)->table)
94 * To check whether the target type is bio-based or not (request-based).
96 #define dm_target_bio_based(t) ((t)->type->map != NULL)
99 * To check whether the target type is request-based or not (bio-based).
101 #define dm_target_request_based(t) ((t)->type->map_rq != NULL)
104 * To check whether the target type is a hybrid (capable of being
105 * either request-based or bio-based).
107 #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
109 /*-----------------------------------------------------------------
110 * A registry of target types.
111 *---------------------------------------------------------------*/
112 int dm_target_init(void);
113 void dm_target_exit(void);
114 struct target_type
*dm_get_target_type(const char *name
);
115 void dm_put_target_type(struct target_type
*tt
);
116 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
117 void *param
), void *param
);
119 int dm_split_args(int *argc
, char ***argvp
, char *input
);
122 * Is this mapped_device being deleted?
124 int dm_deleting_md(struct mapped_device
*md
);
127 * Is this mapped_device suspended?
129 int dm_suspended_md(struct mapped_device
*md
);
132 * The device-mapper can be driven through one of two interfaces;
133 * ioctl or filesystem, depending which patch you have applied.
135 int dm_interface_init(void);
136 void dm_interface_exit(void);
141 int dm_sysfs_init(struct mapped_device
*md
);
142 void dm_sysfs_exit(struct mapped_device
*md
);
143 struct kobject
*dm_kobject(struct mapped_device
*md
);
144 struct mapped_device
*dm_get_from_kobject(struct kobject
*kobj
);
147 * Targets for linear and striped mappings
149 int dm_linear_init(void);
150 void dm_linear_exit(void);
152 int dm_stripe_init(void);
153 void dm_stripe_exit(void);
156 * mapped_device operations
158 void dm_destroy(struct mapped_device
*md
);
159 void dm_destroy_immediate(struct mapped_device
*md
);
160 int dm_open_count(struct mapped_device
*md
);
161 int dm_lock_for_deletion(struct mapped_device
*md
);
162 int dm_request_based(struct mapped_device
*md
);
163 sector_t
dm_get_size(struct mapped_device
*md
);
164 struct dm_stats
*dm_get_stats(struct mapped_device
*md
);
166 int dm_kobject_uevent(struct mapped_device
*md
, enum kobject_action action
,
169 void dm_internal_suspend(struct mapped_device
*md
);
170 void dm_internal_resume(struct mapped_device
*md
);
172 int dm_io_init(void);
173 void dm_io_exit(void);
175 int dm_kcopyd_init(void);
176 void dm_kcopyd_exit(void);
181 struct dm_md_mempools
*dm_alloc_md_mempools(unsigned type
, unsigned integrity
, unsigned per_bio_data_size
);
182 void dm_free_md_mempools(struct dm_md_mempools
*pools
);
185 * Helpers that are used by DM core
187 static inline bool dm_message_test_buffer_overflow(char *result
, unsigned maxlen
)
189 return !maxlen
|| strlen(result
) + 1 >= maxlen
;