1 /* $NetBSD: dm_dev.c,v 1.8 2010/01/04 00:19:08 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.
32 #include <sys/types.h>
33 #include <sys/param.h>
36 #include <sys/disklabel.h>
37 #include <sys/ioccom.h>
38 #include <sys/malloc.h>
40 #include "netbsd-dm.h"
43 static dm_dev_t *dm_dev_lookup_name(const char *);
44 static dm_dev_t *dm_dev_lookup_uuid(const char *);
45 static dm_dev_t *dm_dev_lookup_minor(int);
47 static struct dm_dev_head dm_dev_list =
48 TAILQ_HEAD_INITIALIZER(dm_dev_list);
50 struct lock dm_dev_mutex;
52 /* dm_dev_mutex must be holdby caller before using disable_dev. */
54 disable_dev(dm_dev_t * dmv)
56 TAILQ_REMOVE(&dm_dev_list, dmv, next_devlist);
57 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
58 lockmgr(&dm_dev_mutex, LK_RELEASE);
59 while (dmv->ref_cnt != 0)
60 cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
61 lockmgr(&dmv->dev_mtx, LK_RELEASE);
64 * Generic function used to lookup dm_dev_t. Calling with dm_dev_name
65 * and dm_dev_uuid NULL is allowed.
68 dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid,
74 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
76 /* KKASSERT(dm_dev_name != NULL && dm_dev_uuid != NULL && dm_dev_minor
79 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
81 lockmgr(&dm_dev_mutex, LK_RELEASE);
84 if (dm_dev_name != NULL)
85 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
87 lockmgr(&dm_dev_mutex, LK_RELEASE);
90 if (dm_dev_uuid != NULL)
91 if ((dmv = dm_dev_lookup_uuid(dm_dev_uuid)) != NULL) {
93 lockmgr(&dm_dev_mutex, LK_RELEASE);
96 lockmgr(&dm_dev_mutex, LK_RELEASE);
102 * Lookup device with its minor number.
105 dm_dev_lookup_minor(int dm_dev_minor)
109 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
110 if (dm_dev_minor == dmv->minor)
117 * Lookup device with it's device name.
120 dm_dev_lookup_name(const char *dm_dev_name)
126 slen = strlen(dm_dev_name);
131 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
133 dlen = strlen(dmv->name);
138 if (strncmp(dm_dev_name, dmv->name, slen) == 0)
145 * Lookup device with it's device uuid. Used mostly by LVM2tools.
148 dm_dev_lookup_uuid(const char *dm_dev_uuid)
154 len = strlen(dm_dev_uuid);
159 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
161 if (strlen(dmv->uuid) != len)
164 if (strncmp(dm_dev_uuid, dmv->uuid, strlen(dmv->uuid)) == 0)
171 * Insert new device to the global list of devices.
174 dm_dev_insert(dm_dev_t * dev)
182 KKASSERT(dev != NULL);
183 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
184 if (((dmv = dm_dev_lookup_uuid(dev->uuid)) == NULL) &&
185 ((dmv = dm_dev_lookup_name(dev->name)) == NULL) &&
186 ((dmv = dm_dev_lookup_minor(dev->minor)) == NULL)) {
188 TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist);
193 lockmgr(&dm_dev_mutex, LK_RELEASE);
198 * Lookup device with its minor number.
201 dm_dev_test_minor(int dm_dev_minor)
205 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
206 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
207 if (dm_dev_minor == dmv->minor) {
208 lockmgr(&dm_dev_mutex, LK_RELEASE);
212 lockmgr(&dm_dev_mutex, LK_RELEASE);
220 * dm_dev_lookup_devt look for selected device_t. We keep this routine
221 * outside of dm_dev_lookup because it is a temporally solution.
223 * TODO: This is a hack autoconf should be more flexible.
226 dm_dev_detach(device_t devt)
230 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
231 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
232 if (devt == dmv->devt) {
234 lockmgr(&dm_dev_mutex, LK_RELEASE);
238 lockmgr(&dm_dev_mutex, LK_RELEASE);
245 * Remove device selected with dm_dev from global list of devices.
248 dm_dev_rem(const char *dm_dev_name, const char *dm_dev_uuid,
254 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
256 if (dm_dev_minor > 0)
257 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
261 if (dm_dev_name != NULL)
262 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
266 if (dm_dev_uuid != NULL)
267 if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL) {
271 lockmgr(&dm_dev_mutex, LK_RELEASE);
276 * Destroy all devices created in device-mapper. Remove all tables
277 * free all allocated memmory.
283 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
285 while (TAILQ_FIRST(&dm_dev_list) != NULL) {
287 dmv = TAILQ_FIRST(&dm_dev_list);
289 TAILQ_REMOVE(&dm_dev_list, TAILQ_FIRST(&dm_dev_list),
292 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
294 while (dmv->ref_cnt != 0)
295 cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
297 /* Destroy active table first. */
298 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
300 /* Destroy inactive table if exits, too. */
301 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
303 dm_table_head_destroy(&dmv->table_head);
305 lockmgr(&dmv->dev_mtx, LK_RELEASE);
306 lockuninit(&dmv->dev_mtx);
307 cv_destroy(&dmv->dev_cv);
309 (void) kfree(dmv, M_DM);
311 lockmgr(&dm_dev_mutex, LK_RELEASE);
313 lockuninit(&dm_dev_mutex);
317 * Allocate new device entry.
324 dmv = kmalloc(sizeof(dm_dev_t), M_DM, M_WAITOK | M_ZERO);
327 dmv->diskp = kmalloc(sizeof(struct disk), M_DM, M_WAITOK | M_ZERO);
332 * Freed device entry.
335 dm_dev_free(dm_dev_t * dmv)
337 KKASSERT(dmv != NULL);
339 lockuninit(&dmv->dev_mtx);
340 lockuninit(&dmv->diskp_mtx);
341 cv_destroy(&dmv->dev_cv);
343 if (dmv->diskp != NULL)
344 (void) kfree(dmv->diskp, M_DM);
346 (void) kfree(dmv, M_DM);
352 dm_dev_busy(dm_dev_t * dmv)
354 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
356 lockmgr(&dmv->dev_mtx, LK_RELEASE);
360 dm_dev_unbusy(dm_dev_t * dmv)
362 KKASSERT(dmv->ref_cnt != 0);
364 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
365 if (--dmv->ref_cnt == 0)
366 cv_broadcast(&dmv->dev_cv);
367 lockmgr(&dmv->dev_mtx, LK_RELEASE);
370 * Return prop_array of dm_targer_list dictionaries.
373 dm_dev_prop_list(void)
376 prop_array_t dev_array;
377 prop_dictionary_t dev_dict;
379 dev_array = prop_array_create();
381 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
383 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
384 dev_dict = prop_dictionary_create();
386 prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmv->name);
387 prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmv->minor);
389 prop_array_add(dev_array, dev_dict);
390 prop_object_release(dev_dict);
393 lockmgr(&dm_dev_mutex, LK_RELEASE);
397 * Initialize global device mutex.
402 TAILQ_INIT(&dm_dev_list); /* initialize global dev list */
403 lockinit(&dm_dev_mutex, "dmdevlist", 0, LK_CANRECURSE);