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Commit | Line | Data |
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1da177e4 LT |
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 | char name[16]; | |
48 | }; | |
49 | ||
50 | struct dm_table; | |
51 | struct mapped_device; | |
52 | ||
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 | ||
62 | /* | |
63 | * Reference counting for md. | |
64 | */ | |
65 | void dm_get(struct mapped_device *md); | |
66 | void dm_put(struct mapped_device *md); | |
67 | ||
68 | /* | |
69 | * A device can still be used while suspended, but I/O is deferred. | |
70 | */ | |
71 | int dm_suspend(struct mapped_device *md); | |
72 | int dm_resume(struct mapped_device *md); | |
73 | ||
74 | /* | |
75 | * The device must be suspended before calling this method. | |
76 | */ | |
77 | int dm_swap_table(struct mapped_device *md, struct dm_table *t); | |
78 | ||
79 | /* | |
80 | * Drop a reference on the table when you've finished with the | |
81 | * result. | |
82 | */ | |
83 | struct dm_table *dm_get_table(struct mapped_device *md); | |
84 | ||
85 | /* | |
86 | * Event functions. | |
87 | */ | |
88 | uint32_t dm_get_event_nr(struct mapped_device *md); | |
89 | int dm_wait_event(struct mapped_device *md, int event_nr); | |
90 | ||
91 | /* | |
92 | * Info functions. | |
93 | */ | |
94 | struct gendisk *dm_disk(struct mapped_device *md); | |
95 | int dm_suspended(struct mapped_device *md); | |
96 | ||
97 | /*----------------------------------------------------------------- | |
98 | * Functions for manipulating a table. Tables are also reference | |
99 | * counted. | |
100 | *---------------------------------------------------------------*/ | |
101 | int dm_table_create(struct dm_table **result, int mode, unsigned num_targets); | |
102 | ||
103 | void dm_table_get(struct dm_table *t); | |
104 | void dm_table_put(struct dm_table *t); | |
105 | ||
106 | int dm_table_add_target(struct dm_table *t, const char *type, | |
107 | sector_t start, sector_t len, char *params); | |
108 | int dm_table_complete(struct dm_table *t); | |
109 | void dm_table_event_callback(struct dm_table *t, | |
110 | void (*fn)(void *), void *context); | |
111 | void dm_table_event(struct dm_table *t); | |
112 | sector_t dm_table_get_size(struct dm_table *t); | |
113 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); | |
114 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); | |
115 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); | |
116 | unsigned int dm_table_get_num_targets(struct dm_table *t); | |
117 | struct list_head *dm_table_get_devices(struct dm_table *t); | |
118 | int dm_table_get_mode(struct dm_table *t); | |
119 | void dm_table_presuspend_targets(struct dm_table *t); | |
120 | void dm_table_postsuspend_targets(struct dm_table *t); | |
121 | void dm_table_resume_targets(struct dm_table *t); | |
122 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); | |
123 | void dm_table_unplug_all(struct dm_table *t); | |
124 | int dm_table_flush_all(struct dm_table *t); | |
125 | ||
126 | /*----------------------------------------------------------------- | |
127 | * A registry of target types. | |
128 | *---------------------------------------------------------------*/ | |
129 | int dm_target_init(void); | |
130 | void dm_target_exit(void); | |
131 | struct target_type *dm_get_target_type(const char *name); | |
132 | void dm_put_target_type(struct target_type *t); | |
133 | int dm_target_iterate(void (*iter_func)(struct target_type *tt, | |
134 | void *param), void *param); | |
135 | ||
136 | ||
137 | /*----------------------------------------------------------------- | |
138 | * Useful inlines. | |
139 | *---------------------------------------------------------------*/ | |
140 | static inline int array_too_big(unsigned long fixed, unsigned long obj, | |
141 | unsigned long num) | |
142 | { | |
143 | return (num > (ULONG_MAX - fixed) / obj); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Ceiling(n / sz) | |
148 | */ | |
149 | #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) | |
150 | ||
151 | #define dm_sector_div_up(n, sz) ( \ | |
152 | { \ | |
153 | sector_t _r = ((n) + (sz) - 1); \ | |
154 | sector_div(_r, (sz)); \ | |
155 | _r; \ | |
156 | } \ | |
157 | ) | |
158 | ||
159 | /* | |
160 | * ceiling(n / size) * size | |
161 | */ | |
162 | #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) | |
163 | ||
164 | static inline sector_t to_sector(unsigned long n) | |
165 | { | |
166 | return (n >> 9); | |
167 | } | |
168 | ||
169 | static inline unsigned long to_bytes(sector_t n) | |
170 | { | |
171 | return (n << 9); | |
172 | } | |
173 | ||
174 | int dm_split_args(int *argc, char ***argvp, char *input); | |
175 | ||
176 | /* | |
177 | * The device-mapper can be driven through one of two interfaces; | |
178 | * ioctl or filesystem, depending which patch you have applied. | |
179 | */ | |
180 | int dm_interface_init(void); | |
181 | void dm_interface_exit(void); | |
182 | ||
183 | /* | |
184 | * Targets for linear and striped mappings | |
185 | */ | |
186 | int dm_linear_init(void); | |
187 | void dm_linear_exit(void); | |
188 | ||
189 | int dm_stripe_init(void); | |
190 | void dm_stripe_exit(void); | |
191 | ||
192 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); | |
193 | union map_info *dm_get_mapinfo(struct bio *bio); | |
194 | ||
195 | #endif |