]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Internal header file for device mapper | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Sistina Software | |
2b06cfff | 5 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
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> | |
3ac51e74 | 17 | #include <linux/hdreg.h> |
1da177e4 LT |
18 | |
19 | #define DM_NAME "device-mapper" | |
72d94861 | 20 | |
d0d444c7 JB |
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 | ||
cc109201 | 48 | #ifdef CONFIG_DM_DEBUG |
d0d444c7 JB |
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) | |
cc109201 BR |
57 | #else |
58 | # define DMDEBUG(f, arg...) do {} while (0) | |
d0d444c7 | 59 | # define DMDEBUG_LIMIT(f, arg...) do {} while (0) |
cc109201 | 60 | #endif |
1da177e4 LT |
61 | |
62 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ | |
63 | 0 : scnprintf(result + sz, maxlen - sz, x)) | |
64 | ||
1da177e4 LT |
65 | #define SECTOR_SHIFT 9 |
66 | ||
45cbcd79 KU |
67 | /* |
68 | * Definitions of return values from target end_io function. | |
69 | */ | |
70 | #define DM_ENDIO_INCOMPLETE 1 | |
2e93ccc1 | 71 | #define DM_ENDIO_REQUEUE 2 |
45cbcd79 KU |
72 | |
73 | /* | |
74 | * Definitions of return values from target map function. | |
75 | */ | |
76 | #define DM_MAPIO_SUBMITTED 0 | |
77 | #define DM_MAPIO_REMAPPED 1 | |
2e93ccc1 | 78 | #define DM_MAPIO_REQUEUE DM_ENDIO_REQUEUE |
45cbcd79 | 79 | |
a3d77d35 KU |
80 | /* |
81 | * Suspend feature flags | |
82 | */ | |
83 | #define DM_SUSPEND_LOCKFS_FLAG (1 << 0) | |
81fdb096 | 84 | #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) |
a3d77d35 | 85 | |
1da177e4 LT |
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; | |
1da177e4 LT |
99 | |
100 | /*----------------------------------------------------------------- | |
17b2f66f | 101 | * Internal table functions. |
1da177e4 | 102 | *---------------------------------------------------------------*/ |
1da177e4 LT |
103 | void dm_table_event_callback(struct dm_table *t, |
104 | void (*fn)(void *), void *context); | |
1da177e4 LT |
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); | |
1da177e4 | 108 | struct list_head *dm_table_get_devices(struct dm_table *t); |
1da177e4 LT |
109 | void dm_table_presuspend_targets(struct dm_table *t); |
110 | void dm_table_postsuspend_targets(struct dm_table *t); | |
8757b776 | 111 | int dm_table_resume_targets(struct dm_table *t); |
1da177e4 LT |
112 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); |
113 | void dm_table_unplug_all(struct dm_table *t); | |
1da177e4 | 114 | |
512875bd JN |
115 | /* |
116 | * To check the return value from dm_table_find_target(). | |
117 | */ | |
118 | #define dm_target_is_valid(t) ((t)->table) | |
119 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
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); | |
5c6bd75d AK |
187 | int dm_open_count(struct mapped_device *md); |
188 | int dm_lock_for_deletion(struct mapped_device *md); | |
1da177e4 | 189 | |
69267a30 AK |
190 | void dm_kobject_uevent(struct mapped_device *md); |
191 | ||
1da177e4 | 192 | #endif |