1 /*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
6 *
7 * This file is released under the LGPL.
8 */
9
10 #ifndef DM_INTERNAL_H
11 #define DM_INTERNAL_H
12
13 #include <linux/fs.h>
14 #include <linux/device-mapper.h>
15 #include <linux/list.h>
16 #include <linux/blkdev.h>
17
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)
22
23 #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
24 0 : scnprintf(result + sz, maxlen - sz, x))
25
26 /*
27 * FIXME: I think this should be with the definition of sector_t
28 * in types.h.
29 */
30 #ifdef CONFIG_LBD
31 #define SECTOR_FORMAT "%Lu"
32 #else
33 #define SECTOR_FORMAT "%lu"
34 #endif
35
36 #define SECTOR_SHIFT 9
37
38 /*
39 * List of devices that a metadevice uses and should open/close.
40 */
41 struct dm_dev {
42 struct list_head list;
43
44 atomic_t count;
45 int mode;
46 struct block_device *bdev;
47 };
48
49 struct dm_table;
50 struct mapped_device;
51
52 /*-----------------------------------------------------------------
53 * Functions for manipulating a struct mapped_device.
54 * Drop the reference with dm_put when you finish with the object.
55 *---------------------------------------------------------------*/
56 int dm_create(struct mapped_device **md);
57 int dm_create_with_minor(unsigned int minor, struct mapped_device **md);
58 void dm_set_mdptr(struct mapped_device *md, void *ptr);
59 void *dm_get_mdptr(dev_t dev);
60
61 /*
62 * Reference counting for md.
63 */
64 void dm_get(struct mapped_device *md);
65 void dm_put(struct mapped_device *md);
66
67 /*
68 * A device can still be used while suspended, but I/O is deferred.
69 */
70 int dm_suspend(struct mapped_device *md);
71 int dm_resume(struct mapped_device *md);
72
73 /*
74 * The device must be suspended before calling this method.
75 */
76 int dm_swap_table(struct mapped_device *md, struct dm_table *t);
77
78 /*
79 * Drop a reference on the table when you've finished with the
80 * result.
81 */
82 struct dm_table *dm_get_table(struct mapped_device *md);
83
84 /*
85 * Event functions.
86 */
87 uint32_t dm_get_event_nr(struct mapped_device *md);
88 int dm_wait_event(struct mapped_device *md, int event_nr);
89
90 /*
91 * Info functions.
92 */
93 struct gendisk *dm_disk(struct mapped_device *md);
94 int dm_suspended(struct mapped_device *md);
95
96 /*-----------------------------------------------------------------
97 * Functions for manipulating a table. Tables are also reference
98 * counted.
99 *---------------------------------------------------------------*/
100 int dm_table_create(struct dm_table **result, int mode, unsigned num_targets);
101
102 void dm_table_get(struct dm_table *t);
103 void dm_table_put(struct dm_table *t);
104
105 int dm_table_add_target(struct dm_table *t, const char *type,
106 sector_t start, sector_t len, char *params);
107 int dm_table_complete(struct dm_table *t);
108 void dm_table_event_callback(struct dm_table *t,
109 void (*fn)(void *), void *context);
110 void dm_table_event(struct dm_table *t);
111 sector_t dm_table_get_size(struct dm_table *t);
112 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
113 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
114 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
115 unsigned int dm_table_get_num_targets(struct dm_table *t);
116 struct list_head *dm_table_get_devices(struct dm_table *t);
117 int dm_table_get_mode(struct dm_table *t);
118 void dm_table_presuspend_targets(struct dm_table *t);
119 void dm_table_postsuspend_targets(struct dm_table *t);
120 void dm_table_resume_targets(struct dm_table *t);
121 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
122 void dm_table_unplug_all(struct dm_table *t);
123 int dm_table_flush_all(struct dm_table *t);
124
125 /*-----------------------------------------------------------------
126 * A registry of target types.
127 *---------------------------------------------------------------*/
128 int dm_target_init(void);
129 void dm_target_exit(void);
130 struct target_type *dm_get_target_type(const char *name);
131 void dm_put_target_type(struct target_type *t);
132 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
133 void *param), void *param);
134
135
136 /*-----------------------------------------------------------------
137 * Useful inlines.
138 *---------------------------------------------------------------*/
139 static inline int array_too_big(unsigned long fixed, unsigned long obj,
140 unsigned long num)
141 {
142 return (num > (ULONG_MAX - fixed) / obj);
143 }
144
145 /*
146 * Ceiling(n / sz)
147 */
148 #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
149
150 #define dm_sector_div_up(n, sz) ( \
151 { \
152 sector_t _r = ((n) + (sz) - 1); \
153 sector_div(_r, (sz)); \
154 _r; \
155 } \
156 )
157
158 /*
159 * ceiling(n / size) * size
160 */
161 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
162
163 static inline sector_t to_sector(unsigned long n)
164 {
165 return (n >> 9);
166 }
167
168 static inline unsigned long to_bytes(sector_t n)
169 {
170 return (n << 9);
171 }
172
173 int dm_split_args(int *argc, char ***argvp, char *input);
174
175 /*
176 * The device-mapper can be driven through one of two interfaces;
177 * ioctl or filesystem, depending which patch you have applied.
178 */
179 int dm_interface_init(void);
180 void dm_interface_exit(void);
181
182 /*
183 * Targets for linear and striped mappings
184 */
185 int dm_linear_init(void);
186 void dm_linear_exit(void);
187
188 int dm_stripe_init(void);
189 void dm_stripe_exit(void);
190
191 void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
192
193 #endif
194
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