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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#include <linux/hdreg.h>
18
19#define DM_NAME "device-mapper"
20
21#define DMERR(f, arg...) \
22 printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
23#define DMERR_LIMIT(f, arg...) \
24 do { \
25 if (printk_ratelimit()) \
26 printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " \
27 f "\n", ## arg); \
28 } while (0)
29
30#define DMWARN(f, arg...) \
31 printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
32#define DMWARN_LIMIT(f, arg...) \
33 do { \
34 if (printk_ratelimit()) \
35 printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " \
36 f "\n", ## arg); \
37 } while (0)
38
39#define DMINFO(f, arg...) \
40 printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg)
41#define DMINFO_LIMIT(f, arg...) \
42 do { \
43 if (printk_ratelimit()) \
44 printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f \
45 "\n", ## arg); \
46 } while (0)
47
48#ifdef CONFIG_DM_DEBUG
49# define DMDEBUG(f, arg...) \
50 printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg)
51# define DMDEBUG_LIMIT(f, arg...) \
52 do { \
53 if (printk_ratelimit()) \
54 printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX ": " f \
55 "\n", ## arg); \
56 } while (0)
57#else
58# define DMDEBUG(f, arg...) do {} while (0)
59# define DMDEBUG_LIMIT(f, arg...) do {} while (0)
60#endif
61
62#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
63 0 : scnprintf(result + sz, maxlen - sz, x))
64
65#define SECTOR_SHIFT 9
66
67
68
69
70#define DM_ENDIO_INCOMPLETE 1
71#define DM_ENDIO_REQUEUE 2
72
73
74
75
76#define DM_MAPIO_SUBMITTED 0
77#define DM_MAPIO_REMAPPED 1
78#define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
79
80
81
82
83#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
84#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
85
86
87
88
89struct dm_dev {
90 struct list_head list;
91
92 atomic_t count;
93 int mode;
94 struct block_device *bdev;
95 char name[16];
96};
97
98struct dm_table;
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100
101
102
103void dm_table_event_callback(struct dm_table *t,
104 void (*fn)(void *), void *context);
105struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
106struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
107void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
108struct list_head *dm_table_get_devices(struct dm_table *t);
109void dm_table_presuspend_targets(struct dm_table *t);
110void dm_table_postsuspend_targets(struct dm_table *t);
111int dm_table_resume_targets(struct dm_table *t);
112int dm_table_any_congested(struct dm_table *t, int bdi_bits);
113void dm_table_unplug_all(struct dm_table *t);
114
115
116
117
118#define dm_target_is_valid(t) ((t)->table)
119
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121
122
123int dm_target_init(void);
124void dm_target_exit(void);
125struct target_type *dm_get_target_type(const char *name);
126void dm_put_target_type(struct target_type *t);
127int dm_target_iterate(void (*iter_func)(struct target_type *tt,
128 void *param), void *param);
129
130
131
132
133static inline int array_too_big(unsigned long fixed, unsigned long obj,
134 unsigned long num)
135{
136 return (num > (ULONG_MAX - fixed) / obj);
137}
138
139
140
141
142#define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz))
143
144#define dm_sector_div_up(n, sz) ( \
145{ \
146 sector_t _r = ((n) + (sz) - 1); \
147 sector_div(_r, (sz)); \
148 _r; \
149} \
150)
151
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153
154
155#define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
156
157static inline sector_t to_sector(unsigned long n)
158{
159 return (n >> 9);
160}
161
162static inline unsigned long to_bytes(sector_t n)
163{
164 return (n << 9);
165}
166
167int dm_split_args(int *argc, char ***argvp, char *input);
168
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171
172
173int dm_interface_init(void);
174void dm_interface_exit(void);
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178
179int dm_linear_init(void);
180void dm_linear_exit(void);
181
182int dm_stripe_init(void);
183void dm_stripe_exit(void);
184
185void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
186union map_info *dm_get_mapinfo(struct bio *bio);
187int dm_open_count(struct mapped_device *md);
188int dm_lock_for_deletion(struct mapped_device *md);
189
190void dm_kobject_uevent(struct mapped_device *md);
191
192#endif
193