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>
48 #include <sys/device.h>
49 #include <sys/disklabel.h>
51 #include <libprop/proplib.h>
53 #define DM_MAX_TYPE_NAME 16
54 #define DM_NAME_LEN 128
55 #define DM_UUID_LEN 129
57 #define DM_VERSION_MAJOR 4
58 #define DM_VERSION_MINOR 16
60 #define DM_VERSION_PATCHLEVEL 0
62 /*** Internal device-mapper structures ***/
65 * A table entry describes a physical range of the logical volume.
67 #define MAX_TARGET_STRING_LEN 32
70 * A device mapper table is a list of physical ranges plus the mapping target
76 typedef struct dm_table_entry {
77 struct dm_dev *dm_dev; /* backlink */
81 struct dm_target *target; /* Link to table target. */
82 void *target_config; /* Target specific data. */
83 SLIST_ENTRY(dm_table_entry) next;
86 SLIST_HEAD(dm_table, dm_table_entry);
88 typedef struct dm_table dm_table_t;
90 typedef struct dm_table_head {
91 /* Current active table is selected with this. */
93 struct dm_table tables[2];
95 struct lock table_mtx;
96 struct cv table_cv; /*IO waiting cv */
101 #define MAX_DEV_NAME 32
104 * This structure is used to store opened vnodes for disk with name.
105 * I need this because devices can be opened only once, but I can
106 * have more then one device on one partition.
109 typedef struct dm_pdev {
110 char name[MAX_DEV_NAME];
112 struct vnode *pdev_vnode;
113 int ref_cnt; /* reference counter for users ofthis pdev */
115 SLIST_ENTRY(dm_pdev) next_pdev;
119 * This structure is called for every device-mapper device.
120 * It points to SLIST of device tables and mirrored, snapshoted etc. devices.
122 TAILQ_HEAD(dm_dev_head, dm_dev);
124 typedef struct dm_dev {
125 char name[DM_NAME_LEN];
126 char uuid[DM_UUID_LEN];
128 cdev_t devt; /* pointer to autoconf device_t structure */
130 uint32_t flags; /* store communication protocol flags */
132 struct lock dev_mtx; /* mutex for generall device lock */
133 struct cv dev_cv; /* cv for between ioctl synchronisation */
140 dm_table_head_t table_head;
142 struct dm_dev_head upcalls;
145 struct lock diskp_mtx;
147 TAILQ_ENTRY(dm_dev) next_upcall; /* LIST of mirrored, snapshoted devices. */
149 TAILQ_ENTRY(dm_dev) next_devlist; /* Major device list. */
152 /* Device types used for upcalls */
153 #define DM_ZERO_DEV (1 << 0)
154 #define DM_ERROR_DEV (1 << 1)
155 #define DM_LINEAR_DEV (1 << 2)
156 #define DM_MIRROR_DEV (1 << 3)
157 #define DM_STRIPE_DEV (1 << 4)
158 #define DM_SNAPSHOT_DEV (1 << 5)
159 #define DM_SNAPSHOT_ORIG_DEV (1 << 6)
160 #define DM_SPARE_DEV (1 << 7)
161 /* Set this device type only during dev remove ioctl. */
162 #define DM_DELETING_DEV (1 << 8)
165 /* for zero, error : dm_target->target_config == NULL */
168 * Target config is initiated with target_init function.
172 typedef struct target_linear_config {
175 } dm_target_linear_config_t;
178 typedef struct target_stripe_config {
179 #define MAX_STRIPES 2
180 struct target_linear_config stripe_devs[MAX_STRIPES];
182 uint64_t stripe_chunksize;
184 } dm_target_stripe_config_t;
187 typedef struct target_mirror_config {
188 #define MAX_MIRROR_COPIES 4
190 dm_pdev_t *copies[MAX_MIRROR_COPIES];
192 /* copied blocks bitmaps administration etc*/
193 dm_pdev_t *log_pdev; /* for administration */
194 uint64_t log_regionsize; /* blocksize of mirror */
196 /* list of parts that still need copied etc.; run length encoded? */
197 } dm_target_mirror_config_t;
201 typedef struct target_snapshot_config {
202 dm_pdev_t *tsc_snap_dev;
203 /* cow dev is set only for persistent snapshot devices */
204 dm_pdev_t *tsc_cow_dev;
206 uint64_t tsc_chunk_size;
207 uint32_t tsc_persistent_dev;
208 } dm_target_snapshot_config_t;
210 /* for snapshot-origin devices */
211 typedef struct target_snapshot_origin_config {
212 dm_pdev_t *tsoc_real_dev;
213 /* list of snapshots ? */
214 } dm_target_snapshot_origin_config_t;
216 /* constant dm_target structures for error, zero, linear, stripes etc. */
217 typedef struct dm_target {
218 char name[DM_MAX_TYPE_NAME];
219 /* Initialize target_config area */
220 int (*init)(dm_dev_t *, void **, char *);
222 /* Destroy target_config area */
223 int (*destroy)(dm_table_entry_t *);
225 int (*deps) (dm_table_entry_t *, prop_array_t);
227 * Status routine is called to get params string, which is target
228 * specific. When dm_table_status_ioctl is called with flag
229 * DM_STATUS_TABLE_FLAG I have to sent params string back.
231 char * (*status)(void *);
232 int (*strategy)(dm_table_entry_t *, struct buf *);
233 int (*upcall)(dm_table_entry_t *, struct buf *);
238 TAILQ_ENTRY(dm_target) dm_target_next;
241 /* Interface structures */
244 * This structure is used to translate command sent to kernel driver in
247 * to function which I can call.
249 struct cmd_function {
251 int (*fn)(prop_dictionary_t);
255 void dmsetdiskinfo(struct disk *, dm_table_head_t *);
256 prop_dictionary_t dmgetdiskinfo(struct disk *);
257 void dmgetproperties(struct disk *, dm_table_head_t *);
258 int dm_detach(dm_dev_t *);
261 int dm_dev_create_ioctl(prop_dictionary_t);
262 int dm_dev_list_ioctl(prop_dictionary_t);
263 int dm_dev_remove_ioctl(prop_dictionary_t);
264 int dm_dev_rename_ioctl(prop_dictionary_t);
265 int dm_dev_resume_ioctl(prop_dictionary_t);
266 int dm_dev_status_ioctl(prop_dictionary_t);
267 int dm_dev_suspend_ioctl(prop_dictionary_t);
269 int dm_check_version(prop_dictionary_t);
270 int dm_get_version_ioctl(prop_dictionary_t);
271 int dm_list_versions_ioctl(prop_dictionary_t);
273 int dm_table_clear_ioctl(prop_dictionary_t);
274 int dm_table_deps_ioctl(prop_dictionary_t);
275 int dm_table_load_ioctl(prop_dictionary_t);
276 int dm_table_status_ioctl(prop_dictionary_t);
279 dm_target_t* dm_target_alloc(const char *);
280 dm_target_t* dm_target_autoload(const char *);
281 int dm_target_destroy(void);
282 int dm_target_insert(dm_target_t *);
283 prop_array_t dm_target_prop_list(void);
284 dm_target_t* dm_target_lookup(const char *);
285 int dm_target_rem(char *);
286 void dm_target_unbusy(dm_target_t *);
287 void dm_target_busy(dm_target_t *);
289 /* XXX temporally add */
290 int dm_target_init(void);
292 #define DM_MAX_PARAMS_SIZE 1024
294 /* dm_target_zero.c */
295 int dm_target_zero_init(dm_dev_t *, void**, char *);
296 char * dm_target_zero_status(void *);
297 int dm_target_zero_strategy(dm_table_entry_t *, struct buf *);
298 int dm_target_zero_destroy(dm_table_entry_t *);
299 int dm_target_zero_deps(dm_table_entry_t *, prop_array_t);
300 int dm_target_zero_upcall(dm_table_entry_t *, struct buf *);
302 /* dm_target_error.c */
303 int dm_target_error_init(dm_dev_t *, void**, char *);
304 char * dm_target_error_status(void *);
305 int dm_target_error_strategy(dm_table_entry_t *, struct buf *);
306 int dm_target_error_deps(dm_table_entry_t *, prop_array_t);
307 int dm_target_error_destroy(dm_table_entry_t *);
308 int dm_target_error_upcall(dm_table_entry_t *, struct buf *);
310 /* dm_target_linear.c */
311 int dm_target_linear_init(dm_dev_t *, void**, char *);
312 char * dm_target_linear_status(void *);
313 int dm_target_linear_strategy(dm_table_entry_t *, struct buf *);
314 int dm_target_linear_deps(dm_table_entry_t *, prop_array_t);
315 int dm_target_linear_destroy(dm_table_entry_t *);
316 int dm_target_linear_upcall(dm_table_entry_t *, struct buf *);
318 /* Generic function used to convert char to string */
319 uint64_t atoi(const char *);
321 /* dm_target_mirror.c */
322 int dm_target_mirror_init(dm_dev_t *, void**, char *);
323 char * dm_target_mirror_status(void *);
324 int dm_target_mirror_strategy(dm_table_entry_t *, struct buf *);
325 int dm_target_mirror_deps(dm_table_entry_t *, prop_array_t);
326 int dm_target_mirror_destroy(dm_table_entry_t *);
327 int dm_target_mirror_upcall(dm_table_entry_t *, struct buf *);
329 /* dm_target_stripe.c */
330 int dm_target_stripe_init(dm_dev_t *, void**, char *);
331 char * dm_target_stripe_status(void *);
332 int dm_target_stripe_strategy(dm_table_entry_t *, struct buf *);
333 int dm_target_stripe_deps(dm_table_entry_t *, prop_array_t);
334 int dm_target_stripe_destroy(dm_table_entry_t *);
335 int dm_target_stripe_upcall(dm_table_entry_t *, struct buf *);
337 /* dm_target_snapshot.c */
338 int dm_target_snapshot_init(dm_dev_t *, void**, char *);
339 char * dm_target_snapshot_status(void *);
340 int dm_target_snapshot_strategy(dm_table_entry_t *, struct buf *);
341 int dm_target_snapshot_deps(dm_table_entry_t *, prop_array_t);
342 int dm_target_snapshot_destroy(dm_table_entry_t *);
343 int dm_target_snapshot_upcall(dm_table_entry_t *, struct buf *);
345 /* dm snapshot origin driver */
346 int dm_target_snapshot_orig_init(dm_dev_t *, void**, char *);
347 char * dm_target_snapshot_orig_status(void *);
348 int dm_target_snapshot_orig_strategy(dm_table_entry_t *, struct buf *);
349 int dm_target_snapshot_orig_deps(dm_table_entry_t *, prop_array_t);
350 int dm_target_snapshot_orig_destroy(dm_table_entry_t *);
351 int dm_target_snapshot_orig_upcall(dm_table_entry_t *, struct buf *);
354 #define DM_TABLE_ACTIVE 0
355 #define DM_TABLE_INACTIVE 1
357 int dm_table_destroy(dm_table_head_t *, uint8_t);
358 uint64_t dm_table_size(dm_table_head_t *);
359 dm_table_t * dm_table_get_entry(dm_table_head_t *, uint8_t);
360 int dm_table_get_target_count(dm_table_head_t *, uint8_t);
361 void dm_table_release(dm_table_head_t *, uint8_t s);
362 void dm_table_switch_tables(dm_table_head_t *);
363 void dm_table_head_init(dm_table_head_t *);
364 void dm_table_head_destroy(dm_table_head_t *);
367 dm_dev_t* dm_dev_alloc(void);
368 void dm_dev_busy(dm_dev_t *);
369 int dm_dev_destroy(void);
370 void disable_dev(dm_dev_t *);
371 int dm_dev_free(dm_dev_t *);
372 int dm_dev_init(void);
373 int dm_dev_insert(dm_dev_t *);
374 dm_dev_t* dm_dev_lookup(const char *, const char *, int);
375 prop_array_t dm_dev_prop_list(void);
376 dm_dev_t* dm_dev_rem(const char *, const char *, int);
377 /*int dm_dev_test_minor(int);*/
378 void dm_dev_unbusy(dm_dev_t *);
381 int dm_pdev_decr(dm_pdev_t *);
382 int dm_pdev_destroy(void);
383 int dm_pdev_init(void);
384 dm_pdev_t* dm_pdev_insert(const char *);
386 /* XXX: temporary hacks */
387 #define aprint_debug kprintf
388 #define aprint_normal kprintf
392 #endif /*_DM_DEV_H_*/