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 "%llu"
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
);
61 struct mapped_device
*dm_get_md(dev_t dev
);
64 * Reference counting for md.
66 void dm_get(struct mapped_device
*md
);
67 void dm_put(struct mapped_device
*md
);
70 * A device can still be used while suspended, but I/O is deferred.
72 int dm_suspend(struct mapped_device
*md
, int with_lockfs
);
73 int dm_resume(struct mapped_device
*md
);
76 * The device must be suspended before calling this method.
78 int dm_swap_table(struct mapped_device
*md
, struct dm_table
*t
);
81 * Drop a reference on the table when you've finished with the
84 struct dm_table
*dm_get_table(struct mapped_device
*md
);
89 uint32_t dm_get_event_nr(struct mapped_device
*md
);
90 int dm_wait_event(struct mapped_device
*md
, int event_nr
);
95 struct gendisk
*dm_disk(struct mapped_device
*md
);
96 int dm_suspended(struct mapped_device
*md
);
98 /*-----------------------------------------------------------------
99 * Functions for manipulating a table. Tables are also reference
101 *---------------------------------------------------------------*/
102 int dm_table_create(struct dm_table
**result
, int mode
, unsigned num_targets
);
104 void dm_table_get(struct dm_table
*t
);
105 void dm_table_put(struct dm_table
*t
);
107 int dm_table_add_target(struct dm_table
*t
, const char *type
,
108 sector_t start
, sector_t len
, char *params
);
109 int dm_table_complete(struct dm_table
*t
);
110 void dm_table_event_callback(struct dm_table
*t
,
111 void (*fn
)(void *), void *context
);
112 void dm_table_event(struct dm_table
*t
);
113 sector_t
dm_table_get_size(struct dm_table
*t
);
114 struct dm_target
*dm_table_get_target(struct dm_table
*t
, unsigned int index
);
115 struct dm_target
*dm_table_find_target(struct dm_table
*t
, sector_t sector
);
116 void dm_table_set_restrictions(struct dm_table
*t
, struct request_queue
*q
);
117 unsigned int dm_table_get_num_targets(struct dm_table
*t
);
118 struct list_head
*dm_table_get_devices(struct dm_table
*t
);
119 int dm_table_get_mode(struct dm_table
*t
);
120 void dm_table_presuspend_targets(struct dm_table
*t
);
121 void dm_table_postsuspend_targets(struct dm_table
*t
);
122 void dm_table_resume_targets(struct dm_table
*t
);
123 int dm_table_any_congested(struct dm_table
*t
, int bdi_bits
);
124 void dm_table_unplug_all(struct dm_table
*t
);
125 int dm_table_flush_all(struct dm_table
*t
);
127 /*-----------------------------------------------------------------
128 * A registry of target types.
129 *---------------------------------------------------------------*/
130 int dm_target_init(void);
131 void dm_target_exit(void);
132 struct target_type
*dm_get_target_type(const char *name
);
133 void dm_put_target_type(struct target_type
*t
);
134 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
135 void *param
), void *param
);
138 /*-----------------------------------------------------------------
140 *---------------------------------------------------------------*/
141 static inline int array_too_big(unsigned long fixed
, unsigned long obj
,
144 return (num
> (ULONG_MAX
- fixed
) / obj
);
150 #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
152 #define dm_sector_div_up(n, sz) ( \
154 sector_t _r = ((n) + (sz) - 1); \
155 sector_div(_r, (sz)); \
161 * ceiling(n / size) * size
163 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
165 static inline sector_t
to_sector(unsigned long n
)
170 static inline unsigned long to_bytes(sector_t n
)
175 int dm_split_args(int *argc
, char ***argvp
, char *input
);
178 * The device-mapper can be driven through one of two interfaces;
179 * ioctl or filesystem, depending which patch you have applied.
181 int dm_interface_init(void);
182 void dm_interface_exit(void);
185 * Targets for linear and striped mappings
187 int dm_linear_init(void);
188 void dm_linear_exit(void);
190 int dm_stripe_init(void);
191 void dm_stripe_exit(void);
193 void *dm_vcalloc(unsigned long nmemb
, unsigned long elem_size
);
194 union map_info
*dm_get_mapinfo(struct bio
*bio
);