1 /*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 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 #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 * Definitions of return values from target end_io function.
69 */
70 #define DM_ENDIO_INCOMPLETE 1
71 #define DM_ENDIO_REQUEUE 2
72
73 /*
74 * Definitions of return values from target map function.
75 */
76 #define DM_MAPIO_SUBMITTED 0
77 #define DM_MAPIO_REMAPPED 1
78 #define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE
79
80 /*
81 * Suspend feature flags
82 */
83 #define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
84 #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
85
86 /*
87 * List of devices that a metadevice uses and should open/close.
88 */
89 struct 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
98 struct dm_table;
99
100 /*-----------------------------------------------------------------
101 * Internal table functions.
102 *---------------------------------------------------------------*/
103 void dm_table_event_callback(struct dm_table *t,
104 void (*fn)(void *), void *context);
105 struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
106 struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
107 void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
108 struct list_head *dm_table_get_devices(struct dm_table *t);
109 void dm_table_presuspend_targets(struct dm_table *t);
110 void dm_table_postsuspend_targets(struct dm_table *t);
111 int dm_table_resume_targets(struct dm_table *t);
112 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
113 void dm_table_unplug_all(struct dm_table *t);
114
115 /*
116 * To check the return value from dm_table_find_target().
117 */
118 #define dm_target_is_valid(t) ((t)->table)
119
120 /*-----------------------------------------------------------------
121 * A registry of target types.
122 *---------------------------------------------------------------*/
123 int dm_target_init(void);
124 void dm_target_exit(void);
125 struct target_type *dm_get_target_type(const char *name);
126 void dm_put_target_type(struct target_type *t);
127 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
128 void *param), void *param);
129
130 /*-----------------------------------------------------------------
131 * Useful inlines.
132 *---------------------------------------------------------------*/
133 static 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 * Ceiling(n / sz)
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
152 /*
153 * ceiling(n / size) * size
154 */
155 #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz))
156
157 static inline sector_t to_sector(unsigned long n)
158 {
159 return (n >> 9);
160 }
161
162 static inline unsigned long to_bytes(sector_t n)
163 {
164 return (n << 9);
165 }
166
167 int dm_split_args(int *argc, char ***argvp, char *input);
168
169 /*
170 * The device-mapper can be driven through one of two interfaces;
171 * ioctl or filesystem, depending which patch you have applied.
172 */
173 int dm_interface_init(void);
174 void dm_interface_exit(void);
175
176 /*
177 * Targets for linear and striped mappings
178 */
179 int dm_linear_init(void);
180 void dm_linear_exit(void);
181
182 int dm_stripe_init(void);
183 void dm_stripe_exit(void);
184
185 void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
186 union map_info *dm_get_mapinfo(struct bio *bio);
187 int dm_open_count(struct mapped_device *md);
188 int dm_lock_for_deletion(struct mapped_device *md);
189
190 void dm_kobject_uevent(struct mapped_device *md);
191
192 #endif
193
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