2 * Internal header file for device mapper
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004 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>
18 #define DM_NAME "device-mapper"
19 #define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x)
20 #define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x)
21 #define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x)
23 #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
24 0 : scnprintf(result + sz, maxlen - sz, x))
27 * FIXME: I think this should be with the definition of sector_t
31 #define SECTOR_FORMAT "%Lu"
33 #define SECTOR_FORMAT "%lu"
36 #define SECTOR_SHIFT 9
39 * List of devices that a metadevice uses and should open/close.
42 struct list_head list
;
46 struct block_device
*bdev
;
53 /*-----------------------------------------------------------------
54 * Functions for manipulating a struct mapped_device.
55 * Drop the reference with dm_put when you finish with the object.
56 *---------------------------------------------------------------*/
57 int dm_create(struct mapped_device
**md
);
58 int dm_create_with_minor(unsigned int minor
, struct mapped_device
**md
);
59 void dm_set_mdptr(struct mapped_device
*md
, void *ptr
);
60 void *dm_get_mdptr(dev_t dev
);
63 * Reference counting for md.
65 void dm_get(struct mapped_device
*md
);
66 void dm_put(struct mapped_device
*md
);
69 * A device can still be used while suspended, but I/O is deferred.
71 int dm_suspend(struct mapped_device
*md
);
72 int dm_resume(struct mapped_device
*md
);
75 * The device must be suspended before calling this method.
77 int dm_swap_table(struct mapped_device
*md
, struct dm_table
*t
);
80 * Drop a reference on the table when you've finished with the
83 struct dm_table
*dm_get_table(struct mapped_device
*md
);
88 uint32_t dm_get_event_nr(struct mapped_device
*md
);
89 int dm_wait_event(struct mapped_device
*md
, int event_nr
);
94 struct gendisk
*dm_disk(struct mapped_device
*md
);
95 int dm_suspended(struct mapped_device
*md
);
97 /*-----------------------------------------------------------------
98 * Functions for manipulating a table. Tables are also reference
100 *---------------------------------------------------------------*/
101 int dm_table_create(struct dm_table
**result
, int mode
, unsigned num_targets
);
103 void dm_table_get(struct dm_table
*t
);
104 void dm_table_put(struct dm_table
*t
);
106 int dm_table_add_target(struct dm_table
*t
, const char *type
,
107 sector_t start
, sector_t len
, char *params
);
108 int dm_table_complete(struct dm_table
*t
);
109 void dm_table_event_callback(struct dm_table
*t
,
110 void (*fn
)(void *), void *context
);
111 void dm_table_event(struct dm_table
*t
);
112 sector_t
dm_table_get_size(struct dm_table
*t
);
113 struct dm_target
*dm_table_get_target(struct dm_table
*t
, unsigned int index
);
114 struct dm_target
*dm_table_find_target(struct dm_table
*t
, sector_t sector
);
115 void dm_table_set_restrictions(struct dm_table
*t
, struct request_queue
*q
);
116 unsigned int dm_table_get_num_targets(struct dm_table
*t
);
117 struct list_head
*dm_table_get_devices(struct dm_table
*t
);
118 int dm_table_get_mode(struct dm_table
*t
);
119 void dm_table_presuspend_targets(struct dm_table
*t
);
120 void dm_table_postsuspend_targets(struct dm_table
*t
);
121 void dm_table_resume_targets(struct dm_table
*t
);
122 int dm_table_any_congested(struct dm_table
*t
, int bdi_bits
);
123 void dm_table_unplug_all(struct dm_table
*t
);
124 int dm_table_flush_all(struct dm_table
*t
);
126 /*-----------------------------------------------------------------
127 * A registry of target types.
128 *---------------------------------------------------------------*/
129 int dm_target_init(void);
130 void dm_target_exit(void);
131 struct target_type
*dm_get_target_type(const char *name
);
132 void dm_put_target_type(struct target_type
*t
);
133 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
134 void *param
), void *param
);
137 /*-----------------------------------------------------------------
139 *---------------------------------------------------------------*/
140 static inline int array_too_big(unsigned long fixed
, unsigned long obj
,
143 return (num
> (ULONG_MAX
- fixed
) / obj
);
149 #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
151 #define dm_sector_div_up(n, sz) ( \
153 sector_t _r = ((n) + (sz) - 1); \
154 sector_div(_r, (sz)); \
160 * ceiling(n / size) * size
162 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
164 static inline sector_t
to_sector(unsigned long n
)
169 static inline unsigned long to_bytes(sector_t n
)
174 int dm_split_args(int *argc
, char ***argvp
, char *input
);
177 * The device-mapper can be driven through one of two interfaces;
178 * ioctl or filesystem, depending which patch you have applied.
180 int dm_interface_init(void);
181 void dm_interface_exit(void);
184 * Targets for linear and striped mappings
186 int dm_linear_init(void);
187 void dm_linear_exit(void);
189 int dm_stripe_init(void);
190 void dm_stripe_exit(void);
192 void *dm_vcalloc(unsigned long nmemb
, unsigned long elem_size
);
193 union map_info
*dm_get_mapinfo(struct bio
*bio
);
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