1/* $NetBSD: dm_dev.c,v 1.9 2014/10/18 08:33:27 snj Exp $ */
2
3/*
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Adam Hamsik.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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.
18 *
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.
30 */
31
32#include <sys/types.h>
33#include <sys/param.h>
34
35#include <sys/disk.h>
36#include <sys/disklabel.h>
37#include <sys/ioctl.h>
38#include <sys/ioccom.h>
39#include <sys/kmem.h>
40
41#include "netbsd-dm.h"
42#include "dm.h"
43
44static dm_dev_t *dm_dev_lookup_name(const char *);
45static dm_dev_t *dm_dev_lookup_uuid(const char *);
46static dm_dev_t *dm_dev_lookup_minor(int);
47
48static struct dm_dev_head dm_dev_list =
49TAILQ_HEAD_INITIALIZER(dm_dev_list);
50
51kmutex_t dm_dev_mutex;
52
53/* dm_dev_mutex must be holdby caller before using disable_dev. */
54__inline static void
55disable_dev(dm_dev_t * dmv)
56{
57 TAILQ_REMOVE(&dm_dev_list, dmv, next_devlist);
58 mutex_enter(&dmv->dev_mtx);
59 mutex_exit(&dm_dev_mutex);
60 while (dmv->ref_cnt != 0)
61 cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
62 mutex_exit(&dmv->dev_mtx);
63}
64/*
65 * Generic function used to lookup dm_dev_t. Calling with dm_dev_name
66 * and dm_dev_uuid NULL is allowed.
67 */
68dm_dev_t *
69dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid,
70 int dm_dev_minor)
71{
72 dm_dev_t *dmv;
73
74 dmv = NULL;
75 mutex_enter(&dm_dev_mutex);
76
77 /* KASSERT(dm_dev_name != NULL && dm_dev_uuid != NULL && dm_dev_minor
78 * > 0); */
79 if (dm_dev_minor > 0)
80 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
81 dm_dev_busy(dmv);
82 mutex_exit(&dm_dev_mutex);
83 return dmv;
84 }
85 if (dm_dev_name != NULL)
86 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
87 dm_dev_busy(dmv);
88 mutex_exit(&dm_dev_mutex);
89 return dmv;
90 }
91 if (dm_dev_uuid != NULL)
92 if ((dmv = dm_dev_lookup_uuid(dm_dev_uuid)) != NULL) {
93 dm_dev_busy(dmv);
94 mutex_exit(&dm_dev_mutex);
95 return dmv;
96 }
97 mutex_exit(&dm_dev_mutex);
98 return NULL;
99}
100
101
102/*
103 * Lookup device with its minor number.
104 */
105static dm_dev_t *
106dm_dev_lookup_minor(int dm_dev_minor)
107{
108 dm_dev_t *dmv;
109
110 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
111 if (dm_dev_minor == dmv->minor)
112 return dmv;
113 }
114
115 return NULL;
116}
117/*
118 * Lookup device with its device name.
119 */
120static dm_dev_t *
121dm_dev_lookup_name(const char *dm_dev_name)
122{
123 dm_dev_t *dmv;
124 int dlen;
125 int slen;
126
127 slen = strlen(dm_dev_name);
128
129 if (slen == 0)
130 return NULL;
131
132 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
133
134 dlen = strlen(dmv->name);
135
136 if (slen != dlen)
137 continue;
138
139 if (strncmp(dm_dev_name, dmv->name, slen) == 0)
140 return dmv;
141 }
142
143 return NULL;
144}
145/*
146 * Lookup device with its device uuid. Used mostly by LVM2tools.
147 */
148static dm_dev_t *
149dm_dev_lookup_uuid(const char *dm_dev_uuid)
150{
151 dm_dev_t *dmv;
152 size_t len;
153
154 len = 0;
155 len = strlen(dm_dev_uuid);
156
157 if (len == 0)
158 return NULL;
159
160 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
161
162 if (strlen(dmv->uuid) != len)
163 continue;
164
165 if (strncmp(dm_dev_uuid, dmv->uuid, strlen(dmv->uuid)) == 0)
166 return dmv;
167 }
168
169 return NULL;
170}
171/*
172 * Insert new device to the global list of devices.
173 */
174int
175dm_dev_insert(dm_dev_t * dev)
176{
177 dm_dev_t *dmv;
178 int r;
179
180 dmv = NULL;
181 r = 0;
182
183 KASSERT(dev != NULL);
184 mutex_enter(&dm_dev_mutex);
185 if (((dmv = dm_dev_lookup_uuid(dev->uuid)) == NULL) &&
186 ((dmv = dm_dev_lookup_name(dev->name)) == NULL) &&
187 ((dmv = dm_dev_lookup_minor(dev->minor)) == NULL)) {
188
189 TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist);
190
191 } else
192 r = EEXIST;
193
194 mutex_exit(&dm_dev_mutex);
195 return r;
196}
197#ifdef notyet
198/*
199 * Lookup device with its minor number.
200 */
201int
202dm_dev_test_minor(int dm_dev_minor)
203{
204 dm_dev_t *dmv;
205
206 mutex_enter(&dm_dev_mutex);
207 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
208 if (dm_dev_minor == dmv->minor) {
209 mutex_exit(&dm_dev_mutex);
210 return 1;
211 }
212 }
213 mutex_exit(&dm_dev_mutex);
214
215 return 0;
216}
217#endif
218
219/*
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.
222 *
223 * TODO: This is a hack autoconf should be more flexible.
224 */
225dm_dev_t *
226dm_dev_detach(device_t devt)
227{
228 dm_dev_t *dmv;
229
230 mutex_enter(&dm_dev_mutex);
231 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
232 if (devt == dmv->devt) {
233 disable_dev(dmv);
234 return dmv;
235 }
236 }
237 mutex_exit(&dm_dev_mutex);
238
239 return NULL;
240}
241/*
242 * Remove device selected with dm_dev from global list of devices.
243 */
244dm_dev_t *
245dm_dev_rem(const char *dm_dev_name, const char *dm_dev_uuid,
246 int dm_dev_minor)
247{
248 dm_dev_t *dmv;
249 dmv = NULL;
250
251 mutex_enter(&dm_dev_mutex);
252
253 if (dm_dev_minor > 0)
254 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
255 disable_dev(dmv);
256 return dmv;
257 }
258 if (dm_dev_name != NULL)
259 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
260 disable_dev(dmv);
261 return dmv;
262 }
263 if (dm_dev_uuid != NULL)
264 if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL) {
265 disable_dev(dmv);
266 return dmv;
267 }
268 mutex_exit(&dm_dev_mutex);
269
270 return NULL;
271}
272/*
273 * Destroy all devices created in device-mapper. Remove all tables
274 * free all allocated memmory.
275 */
276int
277dm_dev_destroy(void)
278{
279 dm_dev_t *dmv;
280 mutex_enter(&dm_dev_mutex);
281
282 while (TAILQ_FIRST(&dm_dev_list) != NULL) {
283
284 dmv = TAILQ_FIRST(&dm_dev_list);
285
286 TAILQ_REMOVE(&dm_dev_list, TAILQ_FIRST(&dm_dev_list),
287 next_devlist);
288
289 mutex_enter(&dmv->dev_mtx);
290
291 while (dmv->ref_cnt != 0)
292 cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
293
294 /* Destroy active table first. */
295 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
296
297 /* Destroy inactive table if exits, too. */
298 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
299
300 dm_table_head_destroy(&dmv->table_head);
301
302 mutex_exit(&dmv->dev_mtx);
303 mutex_destroy(&dmv->dev_mtx);
304 cv_destroy(&dmv->dev_cv);
305
306 (void) kmem_free(dmv, sizeof(dm_dev_t));
307 }
308 mutex_exit(&dm_dev_mutex);
309
310 mutex_destroy(&dm_dev_mutex);
311 return 0;
312}
313/*
314 * Allocate new device entry.
315 */
316dm_dev_t *
317dm_dev_alloc(void)
318{
319 dm_dev_t *dmv;
320
321 dmv = kmem_zalloc(sizeof(dm_dev_t), KM_SLEEP);
322
323 if (dmv != NULL)
324 dmv->diskp = kmem_zalloc(sizeof(struct disk), KM_SLEEP);
325
326 return dmv;
327}
328/*
329 * Freed device entry.
330 */
331int
332dm_dev_free(dm_dev_t * dmv)
333{
334 KASSERT(dmv != NULL);
335
336 mutex_destroy(&dmv->dev_mtx);
337 mutex_destroy(&dmv->diskp_mtx);
338 cv_destroy(&dmv->dev_cv);
339
340 if (dmv->diskp != NULL)
341 (void) kmem_free(dmv->diskp, sizeof(struct disk));
342
343 (void) kmem_free(dmv, sizeof(dm_dev_t));
344
345 return 0;
346}
347
348void
349dm_dev_busy(dm_dev_t * dmv)
350{
351 mutex_enter(&dmv->dev_mtx);
352 dmv->ref_cnt++;
353 mutex_exit(&dmv->dev_mtx);
354}
355
356void
357dm_dev_unbusy(dm_dev_t * dmv)
358{
359 KASSERT(dmv->ref_cnt != 0);
360
361 mutex_enter(&dmv->dev_mtx);
362 if (--dmv->ref_cnt == 0)
363 cv_broadcast(&dmv->dev_cv);
364 mutex_exit(&dmv->dev_mtx);
365}
366/*
367 * Return prop_array of dm_targer_list dictionaries.
368 */
369prop_array_t
370dm_dev_prop_list(void)
371{
372 dm_dev_t *dmv;
373 prop_array_t dev_array;
374 prop_dictionary_t dev_dict;
375
376 dev_array = prop_array_create();
377
378 mutex_enter(&dm_dev_mutex);
379
380 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
381 dev_dict = prop_dictionary_create();
382
383 prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmv->name);
384 prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmv->minor);
385
386 prop_array_add(dev_array, dev_dict);
387 prop_object_release(dev_dict);
388 }
389
390 mutex_exit(&dm_dev_mutex);
391 return dev_array;
392}
393/*
394 * Initialize global device mutex.
395 */
396int
397dm_dev_init(void)
398{
399 TAILQ_INIT(&dm_dev_list); /* initialize global dev list */
400 mutex_init(&dm_dev_mutex, MUTEX_DEFAULT, IPL_NONE);
401 return 0;
402}
403