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> |
be35f486 | 18 | #include <linux/completion.h> |
2995fa78 | 19 | #include <linux/kobject.h> |
1da177e4 | 20 | |
fd2ed4d2 MP |
21 | #include "dm-stats.h" |
22 | ||
a3d77d35 KU |
23 | /* |
24 | * Suspend feature flags | |
25 | */ | |
26 | #define DM_SUSPEND_LOCKFS_FLAG (1 << 0) | |
81fdb096 | 27 | #define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) |
a3d77d35 | 28 | |
1f4e0ff0 AK |
29 | /* |
30 | * Status feature flags | |
31 | */ | |
32 | #define DM_STATUS_NOFLUSH_FLAG (1 << 0) | |
33 | ||
e6ee8c0b KU |
34 | /* |
35 | * Type of table and mapped_device's mempool | |
36 | */ | |
37 | #define DM_TYPE_NONE 0 | |
38 | #define DM_TYPE_BIO_BASED 1 | |
39 | #define DM_TYPE_REQUEST_BASED 2 | |
40 | ||
1da177e4 LT |
41 | /* |
42 | * List of devices that a metadevice uses and should open/close. | |
43 | */ | |
82b1519b | 44 | struct dm_dev_internal { |
1da177e4 | 45 | struct list_head list; |
1da177e4 | 46 | atomic_t count; |
86f1152b | 47 | struct dm_dev *dm_dev; |
1da177e4 LT |
48 | }; |
49 | ||
50 | struct dm_table; | |
e6ee8c0b | 51 | struct dm_md_mempools; |
1da177e4 LT |
52 | |
53 | /*----------------------------------------------------------------- | |
17b2f66f | 54 | * Internal table functions. |
1da177e4 | 55 | *---------------------------------------------------------------*/ |
d5816876 | 56 | void dm_table_destroy(struct dm_table *t); |
1da177e4 LT |
57 | void dm_table_event_callback(struct dm_table *t, |
58 | void (*fn)(void *), void *context); | |
1da177e4 LT |
59 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); |
60 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); | |
3ae70656 | 61 | bool dm_table_has_no_data_devices(struct dm_table *table); |
754c5fc7 MS |
62 | int dm_calculate_queue_limits(struct dm_table *table, |
63 | struct queue_limits *limits); | |
64 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, | |
65 | struct queue_limits *limits); | |
1da177e4 | 66 | struct list_head *dm_table_get_devices(struct dm_table *t); |
1da177e4 LT |
67 | void dm_table_presuspend_targets(struct dm_table *t); |
68 | void dm_table_postsuspend_targets(struct dm_table *t); | |
8757b776 | 69 | int dm_table_resume_targets(struct dm_table *t); |
1da177e4 | 70 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); |
cec47e3d | 71 | int dm_table_any_busy_target(struct dm_table *t); |
e6ee8c0b | 72 | unsigned dm_table_get_type(struct dm_table *t); |
36a0456f | 73 | struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); |
e6ee8c0b | 74 | bool dm_table_request_based(struct dm_table *t); |
e6ee8c0b KU |
75 | void dm_table_free_md_mempools(struct dm_table *t); |
76 | struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); | |
1da177e4 | 77 | |
d5b9dd04 MP |
78 | int dm_queue_merge_is_compulsory(struct request_queue *q); |
79 | ||
a5664dad MS |
80 | void dm_lock_md_type(struct mapped_device *md); |
81 | void dm_unlock_md_type(struct mapped_device *md); | |
82 | void dm_set_md_type(struct mapped_device *md, unsigned type); | |
83 | unsigned dm_get_md_type(struct mapped_device *md); | |
36a0456f | 84 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md); |
a5664dad | 85 | |
4a0b4ddf MS |
86 | int dm_setup_md_queue(struct mapped_device *md); |
87 | ||
512875bd JN |
88 | /* |
89 | * To check the return value from dm_table_find_target(). | |
90 | */ | |
91 | #define dm_target_is_valid(t) ((t)->table) | |
92 | ||
169e2cc2 MS |
93 | /* |
94 | * To check whether the target type is bio-based or not (request-based). | |
95 | */ | |
96 | #define dm_target_bio_based(t) ((t)->type->map != NULL) | |
97 | ||
e6ee8c0b KU |
98 | /* |
99 | * To check whether the target type is request-based or not (bio-based). | |
100 | */ | |
101 | #define dm_target_request_based(t) ((t)->type->map_rq != NULL) | |
102 | ||
169e2cc2 MS |
103 | /* |
104 | * To check whether the target type is a hybrid (capable of being | |
105 | * either request-based or bio-based). | |
106 | */ | |
107 | #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) | |
108 | ||
1da177e4 LT |
109 | /*----------------------------------------------------------------- |
110 | * A registry of target types. | |
111 | *---------------------------------------------------------------*/ | |
112 | int dm_target_init(void); | |
113 | void dm_target_exit(void); | |
114 | struct target_type *dm_get_target_type(const char *name); | |
45194e4f | 115 | void dm_put_target_type(struct target_type *tt); |
1da177e4 LT |
116 | int dm_target_iterate(void (*iter_func)(struct target_type *tt, |
117 | void *param), void *param); | |
118 | ||
1da177e4 LT |
119 | int dm_split_args(int *argc, char ***argvp, char *input); |
120 | ||
432a212c MA |
121 | /* |
122 | * Is this mapped_device being deleted? | |
123 | */ | |
124 | int dm_deleting_md(struct mapped_device *md); | |
125 | ||
4f186f8b KU |
126 | /* |
127 | * Is this mapped_device suspended? | |
128 | */ | |
129 | int dm_suspended_md(struct mapped_device *md); | |
130 | ||
2c140a24 MP |
131 | /* |
132 | * Test if the device is scheduled for deferred remove. | |
133 | */ | |
134 | int dm_test_deferred_remove_flag(struct mapped_device *md); | |
135 | ||
136 | /* | |
137 | * Try to remove devices marked for deferred removal. | |
138 | */ | |
139 | void dm_deferred_remove(void); | |
140 | ||
1da177e4 LT |
141 | /* |
142 | * The device-mapper can be driven through one of two interfaces; | |
143 | * ioctl or filesystem, depending which patch you have applied. | |
144 | */ | |
145 | int dm_interface_init(void); | |
146 | void dm_interface_exit(void); | |
147 | ||
784aae73 MB |
148 | /* |
149 | * sysfs interface | |
150 | */ | |
2995fa78 MP |
151 | struct dm_kobject_holder { |
152 | struct kobject kobj; | |
153 | struct completion completion; | |
154 | }; | |
155 | ||
156 | static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj) | |
157 | { | |
158 | return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; | |
159 | } | |
160 | ||
784aae73 MB |
161 | int dm_sysfs_init(struct mapped_device *md); |
162 | void dm_sysfs_exit(struct mapped_device *md); | |
163 | struct kobject *dm_kobject(struct mapped_device *md); | |
164 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj); | |
2995fa78 MP |
165 | |
166 | /* | |
167 | * The kobject helper | |
168 | */ | |
169 | void dm_kobject_release(struct kobject *kobj); | |
784aae73 | 170 | |
1da177e4 LT |
171 | /* |
172 | * Targets for linear and striped mappings | |
173 | */ | |
174 | int dm_linear_init(void); | |
175 | void dm_linear_exit(void); | |
176 | ||
177 | int dm_stripe_init(void); | |
178 | void dm_stripe_exit(void); | |
179 | ||
3f77316d KU |
180 | /* |
181 | * mapped_device operations | |
182 | */ | |
183 | void dm_destroy(struct mapped_device *md); | |
184 | void dm_destroy_immediate(struct mapped_device *md); | |
5c6bd75d | 185 | int dm_open_count(struct mapped_device *md); |
2c140a24 MP |
186 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); |
187 | int dm_cancel_deferred_remove(struct mapped_device *md); | |
fd2ed4d2 MP |
188 | int dm_request_based(struct mapped_device *md); |
189 | sector_t dm_get_size(struct mapped_device *md); | |
9974fa2c | 190 | struct request_queue *dm_get_md_queue(struct mapped_device *md); |
86f1152b BM |
191 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, |
192 | struct dm_dev **result); | |
193 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d); | |
fd2ed4d2 | 194 | struct dm_stats *dm_get_stats(struct mapped_device *md); |
1da177e4 | 195 | |
3abf85b5 PR |
196 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
197 | unsigned cookie); | |
69267a30 | 198 | |
fd2ed4d2 MP |
199 | void dm_internal_suspend(struct mapped_device *md); |
200 | void dm_internal_resume(struct mapped_device *md); | |
201 | ||
952b3557 MP |
202 | int dm_io_init(void); |
203 | void dm_io_exit(void); | |
204 | ||
945fa4d2 MP |
205 | int dm_kcopyd_init(void); |
206 | void dm_kcopyd_exit(void); | |
207 | ||
e6ee8c0b KU |
208 | /* |
209 | * Mempool operations | |
210 | */ | |
c0820cf5 | 211 | struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size); |
e6ee8c0b KU |
212 | void dm_free_md_mempools(struct dm_md_mempools *pools); |
213 | ||
fd2ed4d2 MP |
214 | /* |
215 | * Helpers that are used by DM core | |
216 | */ | |
e8603136 | 217 | unsigned dm_get_reserved_bio_based_ios(void); |
f4790826 MS |
218 | unsigned dm_get_reserved_rq_based_ios(void); |
219 | ||
fd2ed4d2 MP |
220 | static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) |
221 | { | |
222 | return !maxlen || strlen(result) + 1 >= maxlen; | |
223 | } | |
224 | ||
1da177e4 | 225 | #endif |