1 /* $NetBSD: dm.h,v 1.17 2009/12/29 23:37:48 haad Exp $ */
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
38 #include <sys/errno.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <cpu/inttypes.h>
43 #include <cpu/atomic.h>
44 #include <sys/condvar.h>
46 #include <sys/queue.h>
49 #include <sys/device.h>
50 #include <sys/devicestat.h>
51 #include <sys/diskslice.h>
52 #include <sys/disklabel.h>
53 #include <sys/vfscache.h>
55 #include <libprop/proplib.h>
57 #define DM_MAX_TYPE_NAME 16
58 #define DM_NAME_LEN 128
59 #define DM_UUID_LEN 129
61 #define DM_VERSION_MAJOR 4
62 #define DM_VERSION_MINOR 16
64 #define DM_VERSION_PATCHLEVEL 0
66 /*** Internal device-mapper structures ***/
68 typedef struct dm_mapping {
72 TAILQ_ENTRY(dm_mapping) next;
76 * A device mapper table is a list of physical ranges plus the mapping target
79 typedef struct dm_table_entry {
80 struct dm_dev *dev; /* backlink */
84 struct dm_target *target; /* Link to table target. */
85 void *target_config; /* Target specific data. */
86 TAILQ_ENTRY(dm_table_entry) next;
88 TAILQ_HEAD(, dm_mapping) pdev_maps;
91 TAILQ_HEAD(dm_table, dm_table_entry);
93 typedef struct dm_table dm_table_t;
95 typedef struct dm_table_head {
96 /* Current active table is selected with this. */
98 struct dm_table tables[2];
100 struct lock table_mtx;
105 #define MAX_DEV_NAME 32
108 * This structure is used to store opened vnodes for disk with name.
109 * I need this because devices can be opened only once, but I can
110 * have more then one device on one partition.
113 typedef struct dm_pdev {
114 char name[MAX_DEV_NAME];
115 char udev_name[MAX_DEV_NAME];
117 struct partinfo pdev_pinfo; /* partinfo of the underlying device */
119 struct vnode *pdev_vnode;
120 int ref_cnt; /* reference counter for users ofthis pdev */
122 TAILQ_ENTRY(dm_pdev) next_pdev;
126 * This structure is called for every device-mapper device.
127 * It points to TAILQ of device tables and mirrored, snapshoted etc. devices.
129 typedef struct dm_dev {
130 char name[DM_NAME_LEN];
131 char uuid[DM_UUID_LEN];
133 cdev_t devt; /* pointer to autoconf device_t structure */
135 uint32_t flags; /* store communication protocol flags */
137 struct lock dev_mtx; /* mutex for general device lock */
138 struct cv dev_cv; /* cv for between ioctl synchronization */
140 /* uint32_t event_nr; */
146 dm_table_head_t table_head;
150 struct devstat stats;
152 TAILQ_ENTRY(dm_dev) next_devlist; /* Major device list. */
155 #define DM_ZERO_DEV (1 << 0)
156 #define DM_ERROR_DEV (1 << 1)
157 #define DM_LINEAR_DEV (1 << 2)
158 #define DM_MIRROR_DEV (1 << 3)
159 #define DM_STRIPE_DEV (1 << 4)
160 #define DM_SNAPSHOT_DEV (1 << 5)
161 #define DM_SNAPSHOT_ORIG_DEV (1 << 6)
162 #define DM_RESERVED1_DEV (1 << 7)
163 #define DM_RESERVED2_DEV (1 << 8)
164 #define DM_CRYPTO_DEV (1 << 9)
165 #define DM_RAID1_DEV (1 << 10)
166 #define DM_DELAY_DEV (1 << 11)
168 /* for zero, error : dm_target->target_config == NULL */
171 * Target config is initiated with target_init function.
174 /* constant dm_target structures for error, zero, linear, stripes etc. */
175 typedef struct dm_target {
176 char name[DM_MAX_TYPE_NAME];
181 int (*init)(dm_table_entry_t *, int, char **);
182 int (*destroy)(dm_table_entry_t *);
183 int (*strategy)(dm_table_entry_t *, struct buf *);
188 char *(*table)(void *); /* DM_STATUS_TABLE_FLAG */
189 char *(*info)(void *); /* !DM_STATUS_TABLE_FLAG */
190 int (*dump)(dm_table_entry_t *, void *data, size_t length, off_t offset);
191 int (*message)(dm_table_entry_t *, char *);
197 TAILQ_ENTRY(dm_target) dm_target_next;
200 /* Interface structures */
203 void dmsetdiskinfo(struct disk *, dm_table_head_t *);
206 int dm_dev_create_ioctl(prop_dictionary_t);
207 int dm_dev_list_ioctl(prop_dictionary_t);
208 int dm_dev_remove_ioctl(prop_dictionary_t);
209 int dm_dev_remove_all_ioctl(prop_dictionary_t);
210 int dm_dev_rename_ioctl(prop_dictionary_t);
211 int dm_dev_resume_ioctl(prop_dictionary_t);
212 int dm_dev_status_ioctl(prop_dictionary_t);
213 int dm_dev_suspend_ioctl(prop_dictionary_t);
215 int dm_check_version(prop_dictionary_t);
216 int dm_list_versions_ioctl(prop_dictionary_t);
218 int dm_table_clear_ioctl(prop_dictionary_t);
219 int dm_table_deps_ioctl(prop_dictionary_t);
220 int dm_table_load_ioctl(prop_dictionary_t);
221 int dm_table_status_ioctl(prop_dictionary_t);
222 int dm_message_ioctl(prop_dictionary_t);
225 int dm_target_init(void);
226 int dm_target_uninit(void);
227 dm_target_t* dm_target_alloc(const char *);
228 dm_target_t* dm_target_autoload(const char *);
229 int dm_target_insert(dm_target_t *);
230 prop_array_t dm_target_prop_list(void);
231 dm_target_t* dm_target_lookup(const char *);
232 int dm_target_rem(char *);
233 void dm_target_unbusy(dm_target_t *);
234 void dm_target_busy(dm_target_t *);
236 #define DM_MAX_PARAMS_SIZE 1024
238 /* Generic function used to convert char to string */
239 uint64_t atoi64(const char *);
241 char *dm_alloc_string(int len);
244 #define DM_TABLE_ACTIVE 0
245 #define DM_TABLE_INACTIVE 1
247 int dm_table_destroy(dm_table_head_t *, uint8_t);
248 uint64_t dm_table_size(dm_table_head_t *);
249 uint64_t dm_inactive_table_size(dm_table_head_t *);
250 dm_table_t *dm_table_get_entry(dm_table_head_t *, uint8_t);
251 int dm_table_get_target_count(dm_table_head_t *, uint8_t);
252 void dm_table_release(dm_table_head_t *, uint8_t s);
253 void dm_table_switch_tables(dm_table_head_t *);
254 void dm_table_head_init(dm_table_head_t *);
255 void dm_table_head_destroy(dm_table_head_t *);
256 void dm_table_init_target(dm_table_entry_t *table_en, uint32_t type, void *cfg);
257 int dm_table_add_deps(dm_table_entry_t *table_en, dm_pdev_t *pdev);
258 void dm_table_free_deps(dm_table_entry_t *table_en);
261 int dm_dev_init(void);
262 int dm_dev_uninit(void);
263 dm_dev_t* dm_dev_alloc(void);
264 void dm_dev_busy(dm_dev_t *);
265 int dm_dev_create(dm_dev_t **, const char *, const char *, int);
266 int dm_dev_remove(dm_dev_t *);
267 int dm_dev_remove_all(int);
268 int dm_dev_destroy(dm_dev_t *);
269 int dm_dev_free(dm_dev_t *);
270 int dm_dev_insert(dm_dev_t *);
271 dm_dev_t* dm_dev_lookup(const char *, const char *, int);
272 prop_array_t dm_dev_prop_list(void);
273 dm_dev_t* dm_dev_rem_dev(dm_dev_t *);
274 dm_dev_t* dm_dev_rem(const char *, const char *, int);
275 void dm_dev_unbusy(dm_dev_t *);
278 int dm_pdev_init(void);
279 int dm_pdev_uninit(void);
280 int dm_pdev_decr(dm_pdev_t *);
281 uint64_t dm_pdev_get_udev(dm_pdev_t *);
282 int dm_pdev_get_vattr(dm_pdev_t *, struct vattr *);
283 dm_pdev_t* dm_pdev_insert(const char *);
284 off_t dm_pdev_correct_dump_offset(dm_pdev_t *, off_t);
286 /* dm builtin magic */
287 void dm_builtin_init(void *);
288 void dm_builtin_uninit(void *);
290 extern int dm_debug_level;
291 MALLOC_DECLARE(M_DM);
293 #define dmdebug(format, ...) \
294 do { if (dm_debug_level) kprintf(format, ## __VA_ARGS__); } while(0)
296 #define DM_TARGET_MODULE(name, evh) \
297 static moduledata_t name##_mod = { \
302 DECLARE_MODULE(name, name##_mod, SI_SUB_DM_TARGETS, \
304 MODULE_DEPEND(name, dm, 1, 1, 1)
306 #define DM_TARGET_BUILTIN(name, evh) \
307 SYSINIT(name##module, SI_SUB_DM_TARGETS, SI_ORDER_ANY, \
308 dm_builtin_init, evh); \
309 SYSUNINIT(name##module, SI_SUB_DM_TARGETS, SI_ORDER_ANY, \
310 dm_builtin_uninit, evh)
314 #endif /*_DM_DEV_H_*/