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 | |
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 | */ | |
e5863d9a MS |
37 | #define DM_TYPE_NONE 0 |
38 | #define DM_TYPE_BIO_BASED 1 | |
39 | #define DM_TYPE_REQUEST_BASED 2 | |
40 | #define DM_TYPE_MQ_REQUEST_BASED 3 | |
e6ee8c0b | 41 | |
1da177e4 LT |
42 | /* |
43 | * List of devices that a metadevice uses and should open/close. | |
44 | */ | |
82b1519b | 45 | struct dm_dev_internal { |
1da177e4 | 46 | struct list_head list; |
1da177e4 | 47 | atomic_t count; |
86f1152b | 48 | struct dm_dev *dm_dev; |
1da177e4 LT |
49 | }; |
50 | ||
51 | struct dm_table; | |
e6ee8c0b | 52 | struct dm_md_mempools; |
1da177e4 LT |
53 | |
54 | /*----------------------------------------------------------------- | |
17b2f66f | 55 | * Internal table functions. |
1da177e4 | 56 | *---------------------------------------------------------------*/ |
d5816876 | 57 | void dm_table_destroy(struct dm_table *t); |
1da177e4 LT |
58 | void dm_table_event_callback(struct dm_table *t, |
59 | void (*fn)(void *), void *context); | |
1da177e4 LT |
60 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); |
61 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); | |
3ae70656 | 62 | bool dm_table_has_no_data_devices(struct dm_table *table); |
754c5fc7 MS |
63 | int dm_calculate_queue_limits(struct dm_table *table, |
64 | struct queue_limits *limits); | |
65 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, | |
66 | struct queue_limits *limits); | |
1da177e4 | 67 | struct list_head *dm_table_get_devices(struct dm_table *t); |
1da177e4 | 68 | void dm_table_presuspend_targets(struct dm_table *t); |
d67ee213 | 69 | void dm_table_presuspend_undo_targets(struct dm_table *t); |
1da177e4 | 70 | void dm_table_postsuspend_targets(struct dm_table *t); |
8757b776 | 71 | int dm_table_resume_targets(struct dm_table *t); |
1da177e4 | 72 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); |
e6ee8c0b | 73 | unsigned dm_table_get_type(struct dm_table *t); |
36a0456f | 74 | struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); |
e6ee8c0b | 75 | bool dm_table_request_based(struct dm_table *t); |
e5863d9a | 76 | bool dm_table_mq_request_based(struct dm_table *t); |
e6ee8c0b KU |
77 | void dm_table_free_md_mempools(struct dm_table *t); |
78 | struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); | |
1da177e4 | 79 | |
d5b9dd04 MP |
80 | int dm_queue_merge_is_compulsory(struct request_queue *q); |
81 | ||
a5664dad MS |
82 | void dm_lock_md_type(struct mapped_device *md); |
83 | void dm_unlock_md_type(struct mapped_device *md); | |
84 | void dm_set_md_type(struct mapped_device *md, unsigned type); | |
85 | unsigned dm_get_md_type(struct mapped_device *md); | |
36a0456f | 86 | struct target_type *dm_get_immutable_target_type(struct mapped_device *md); |
a5664dad | 87 | |
4a0b4ddf MS |
88 | int dm_setup_md_queue(struct mapped_device *md); |
89 | ||
512875bd JN |
90 | /* |
91 | * To check the return value from dm_table_find_target(). | |
92 | */ | |
93 | #define dm_target_is_valid(t) ((t)->table) | |
94 | ||
169e2cc2 MS |
95 | /* |
96 | * To check whether the target type is bio-based or not (request-based). | |
97 | */ | |
98 | #define dm_target_bio_based(t) ((t)->type->map != NULL) | |
99 | ||
e6ee8c0b KU |
100 | /* |
101 | * To check whether the target type is request-based or not (bio-based). | |
102 | */ | |
65803c20 MS |
103 | #define dm_target_request_based(t) (((t)->type->map_rq != NULL) || \ |
104 | ((t)->type->clone_and_map_rq != NULL)) | |
e6ee8c0b | 105 | |
169e2cc2 MS |
106 | /* |
107 | * To check whether the target type is a hybrid (capable of being | |
108 | * either request-based or bio-based). | |
109 | */ | |
110 | #define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) | |
111 | ||
1da177e4 LT |
112 | /*----------------------------------------------------------------- |
113 | * A registry of target types. | |
114 | *---------------------------------------------------------------*/ | |
115 | int dm_target_init(void); | |
116 | void dm_target_exit(void); | |
117 | struct target_type *dm_get_target_type(const char *name); | |
45194e4f | 118 | void dm_put_target_type(struct target_type *tt); |
1da177e4 LT |
119 | int dm_target_iterate(void (*iter_func)(struct target_type *tt, |
120 | void *param), void *param); | |
121 | ||
1da177e4 LT |
122 | int dm_split_args(int *argc, char ***argvp, char *input); |
123 | ||
432a212c MA |
124 | /* |
125 | * Is this mapped_device being deleted? | |
126 | */ | |
127 | int dm_deleting_md(struct mapped_device *md); | |
128 | ||
4f186f8b KU |
129 | /* |
130 | * Is this mapped_device suspended? | |
131 | */ | |
132 | int dm_suspended_md(struct mapped_device *md); | |
133 | ||
ffcc3936 MS |
134 | /* |
135 | * Internal suspend and resume methods. | |
136 | */ | |
137 | int dm_suspended_internally_md(struct mapped_device *md); | |
138 | void dm_internal_suspend_fast(struct mapped_device *md); | |
139 | void dm_internal_resume_fast(struct mapped_device *md); | |
140 | void dm_internal_suspend_noflush(struct mapped_device *md); | |
141 | void dm_internal_resume(struct mapped_device *md); | |
142 | ||
2c140a24 MP |
143 | /* |
144 | * Test if the device is scheduled for deferred remove. | |
145 | */ | |
146 | int dm_test_deferred_remove_flag(struct mapped_device *md); | |
147 | ||
148 | /* | |
149 | * Try to remove devices marked for deferred removal. | |
150 | */ | |
151 | void dm_deferred_remove(void); | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * The device-mapper can be driven through one of two interfaces; | |
155 | * ioctl or filesystem, depending which patch you have applied. | |
156 | */ | |
157 | int dm_interface_init(void); | |
158 | void dm_interface_exit(void); | |
159 | ||
784aae73 MB |
160 | /* |
161 | * sysfs interface | |
162 | */ | |
2995fa78 MP |
163 | struct dm_kobject_holder { |
164 | struct kobject kobj; | |
165 | struct completion completion; | |
166 | }; | |
167 | ||
168 | static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj) | |
169 | { | |
170 | return &container_of(kobj, struct dm_kobject_holder, kobj)->completion; | |
171 | } | |
172 | ||
784aae73 MB |
173 | int dm_sysfs_init(struct mapped_device *md); |
174 | void dm_sysfs_exit(struct mapped_device *md); | |
175 | struct kobject *dm_kobject(struct mapped_device *md); | |
176 | struct mapped_device *dm_get_from_kobject(struct kobject *kobj); | |
2995fa78 MP |
177 | |
178 | /* | |
179 | * The kobject helper | |
180 | */ | |
181 | void dm_kobject_release(struct kobject *kobj); | |
784aae73 | 182 | |
1da177e4 LT |
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 | ||
3f77316d KU |
192 | /* |
193 | * mapped_device operations | |
194 | */ | |
195 | void dm_destroy(struct mapped_device *md); | |
196 | void dm_destroy_immediate(struct mapped_device *md); | |
5c6bd75d | 197 | int dm_open_count(struct mapped_device *md); |
2c140a24 MP |
198 | int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); |
199 | int dm_cancel_deferred_remove(struct mapped_device *md); | |
fd2ed4d2 MP |
200 | int dm_request_based(struct mapped_device *md); |
201 | sector_t dm_get_size(struct mapped_device *md); | |
9974fa2c | 202 | struct request_queue *dm_get_md_queue(struct mapped_device *md); |
86f1152b BM |
203 | int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, |
204 | struct dm_dev **result); | |
205 | void dm_put_table_device(struct mapped_device *md, struct dm_dev *d); | |
fd2ed4d2 | 206 | struct dm_stats *dm_get_stats(struct mapped_device *md); |
1da177e4 | 207 | |
3abf85b5 PR |
208 | int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, |
209 | unsigned cookie); | |
69267a30 | 210 | |
fd2ed4d2 MP |
211 | void dm_internal_suspend(struct mapped_device *md); |
212 | void dm_internal_resume(struct mapped_device *md); | |
213 | ||
17e149b8 MS |
214 | bool dm_use_blk_mq(struct mapped_device *md); |
215 | ||
952b3557 MP |
216 | int dm_io_init(void); |
217 | void dm_io_exit(void); | |
218 | ||
945fa4d2 MP |
219 | int dm_kcopyd_init(void); |
220 | void dm_kcopyd_exit(void); | |
221 | ||
e6ee8c0b KU |
222 | /* |
223 | * Mempool operations | |
224 | */ | |
17e149b8 MS |
225 | struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type, |
226 | unsigned integrity, unsigned per_bio_data_size); | |
e6ee8c0b KU |
227 | void dm_free_md_mempools(struct dm_md_mempools *pools); |
228 | ||
fd2ed4d2 MP |
229 | /* |
230 | * Helpers that are used by DM core | |
231 | */ | |
e8603136 | 232 | unsigned dm_get_reserved_bio_based_ios(void); |
f4790826 MS |
233 | unsigned dm_get_reserved_rq_based_ios(void); |
234 | ||
fd2ed4d2 MP |
235 | static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen) |
236 | { | |
237 | return !maxlen || strlen(result) + 1 >= maxlen; | |
238 | } | |
239 | ||
0ce65797 MS |
240 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_show(struct mapped_device *md, char *buf); |
241 | ssize_t dm_attr_rq_based_seq_io_merge_deadline_store(struct mapped_device *md, | |
242 | const char *buf, size_t count); | |
243 | ||
1da177e4 | 244 | #endif |