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git.proxmox.com Git - mirror_ubuntu-bionic-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>
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
);
70 * To check the return value from dm_table_find_target().
72 #define dm_target_is_valid(t) ((t)->table)
75 * To check whether the target type is request-based or not (bio-based).
77 #define dm_target_request_based(t) ((t)->type->map_rq != NULL)
79 /*-----------------------------------------------------------------
80 * A registry of target types.
81 *---------------------------------------------------------------*/
82 int dm_target_init(void);
83 void dm_target_exit(void);
84 struct target_type
*dm_get_target_type(const char *name
);
85 void dm_put_target_type(struct target_type
*tt
);
86 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
87 void *param
), void *param
);
89 int dm_split_args(int *argc
, char ***argvp
, char *input
);
92 * The device-mapper can be driven through one of two interfaces;
93 * ioctl or filesystem, depending which patch you have applied.
95 int dm_interface_init(void);
96 void dm_interface_exit(void);
101 int dm_sysfs_init(struct mapped_device
*md
);
102 void dm_sysfs_exit(struct mapped_device
*md
);
103 struct kobject
*dm_kobject(struct mapped_device
*md
);
104 struct mapped_device
*dm_get_from_kobject(struct kobject
*kobj
);
107 * Targets for linear and striped mappings
109 int dm_linear_init(void);
110 void dm_linear_exit(void);
112 int dm_stripe_init(void);
113 void dm_stripe_exit(void);
115 int dm_open_count(struct mapped_device
*md
);
116 int dm_lock_for_deletion(struct mapped_device
*md
);
118 void dm_kobject_uevent(struct mapped_device
*md
, enum kobject_action action
,
121 int dm_kcopyd_init(void);
122 void dm_kcopyd_exit(void);
127 struct dm_md_mempools
*dm_alloc_md_mempools(unsigned type
);
128 void dm_free_md_mempools(struct dm_md_mempools
*pools
);