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>
34 #include <machine/thread.h>
35 #include <sys/thread2.h>
38 #include <sys/disklabel.h>
39 #include <sys/devicestat.h>
40 #include <sys/device.h>
42 #include <sys/devfs.h>
43 #include <sys/ioccom.h>
44 #include <sys/malloc.h>
45 #include <dev/disk/dm/dm.h>
47 #include "netbsd-dm.h"
49 extern struct dev_ops dm_ops;
51 struct devfs_bitmap dm_minor_bitmap;
52 uint64_t dm_dev_counter;
54 static dm_dev_t *dm_dev_lookup_name(const char *);
55 static dm_dev_t *dm_dev_lookup_uuid(const char *);
56 static dm_dev_t *dm_dev_lookup_minor(int);
58 static struct dm_dev_head dm_dev_list =
59 TAILQ_HEAD_INITIALIZER(dm_dev_list);
61 struct lock dm_dev_mutex;
63 /* dm_dev_mutex must be held by caller before using disable_dev. */
65 disable_dev(dm_dev_t * dmv)
67 KKASSERT(lockstatus(&dm_dev_mutex, curthread) == LK_EXCLUSIVE);
69 TAILQ_REMOVE(&dm_dev_list, dmv, next_devlist);
71 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
72 while (dmv->ref_cnt != 0)
73 cv_wait(&dmv->dev_cv, &dmv->dev_mtx);
74 lockmgr(&dmv->dev_mtx, LK_RELEASE);
77 * Generic function used to lookup dm_dev_t. Calling with dm_dev_name
78 * and dm_dev_uuid NULL is allowed.
81 dm_dev_lookup(const char *dm_dev_name, const char *dm_dev_uuid,
87 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
89 /* KKASSERT(dm_dev_name != NULL && dm_dev_uuid != NULL && dm_dev_minor
92 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL) {
94 lockmgr(&dm_dev_mutex, LK_RELEASE);
97 if (dm_dev_name != NULL)
98 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL) {
100 lockmgr(&dm_dev_mutex, LK_RELEASE);
103 if (dm_dev_uuid != NULL)
104 if ((dmv = dm_dev_lookup_uuid(dm_dev_uuid)) != NULL) {
106 lockmgr(&dm_dev_mutex, LK_RELEASE);
109 lockmgr(&dm_dev_mutex, LK_RELEASE);
115 * Lookup device with its minor number.
118 dm_dev_lookup_minor(int dm_dev_minor)
122 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
123 if (dm_dev_minor == dmv->minor)
130 * Lookup device with it's device name.
133 dm_dev_lookup_name(const char *dm_dev_name)
137 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
138 if (strcmp(dm_dev_name, dmv->name) == 0)
145 * Lookup device with it's device uuid. Used mostly by LVM2tools.
148 dm_dev_lookup_uuid(const char *dm_dev_uuid)
152 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
153 if (strcmp(dm_dev_uuid, dmv->uuid) == 0)
160 * Insert new device to the global list of devices.
163 dm_dev_insert(dm_dev_t * dev)
171 KKASSERT(dev != NULL);
172 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
173 if (((dmv = dm_dev_lookup_uuid(dev->uuid)) == NULL) &&
174 ((dmv = dm_dev_lookup_name(dev->name)) == NULL) &&
175 ((dmv = dm_dev_lookup_minor(dev->minor)) == NULL)) {
177 TAILQ_INSERT_TAIL(&dm_dev_list, dev, next_devlist);
182 lockmgr(&dm_dev_mutex, LK_RELEASE);
187 * Remove device selected with dm_dev from global list of devices.
190 dm_dev_rem(dm_dev_t *dmv, const char *dm_dev_name, const char *dm_dev_uuid,
193 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
197 } else if (dm_dev_minor > 0) {
198 if ((dmv = dm_dev_lookup_minor(dm_dev_minor)) != NULL)
200 } else if (dm_dev_name != NULL) {
201 if ((dmv = dm_dev_lookup_name(dm_dev_name)) != NULL)
203 } else if (dm_dev_uuid != NULL) {
204 if ((dmv = dm_dev_lookup_name(dm_dev_uuid)) != NULL)
208 lockmgr(&dm_dev_mutex, LK_RELEASE);
214 dm_dev_create(dm_dev_t **dmvp, const char *name, const char *uuid, int flags)
217 char name_buf[MAXPATHLEN];
220 if ((dmv = dm_dev_alloc()) == NULL)
224 strncpy(dmv->uuid, uuid, DM_UUID_LEN);
229 strlcpy(dmv->name, name, DM_NAME_LEN);
231 dm_minor = devfs_clone_bitmap_get(&dm_minor_bitmap, 0);
233 dm_table_head_init(&dmv->table_head);
235 lockinit(&dmv->dev_mtx, "dmdev", 0, LK_CANRECURSE);
236 cv_init(&dmv->dev_cv, "dm_dev");
238 if (flags & DM_READONLY_FLAG)
239 dmv->flags |= DM_READONLY_FLAG;
241 aprint_debug("Creating device dm/%s\n", name);
242 ksnprintf(name_buf, sizeof(name_buf), "mapper/%s", dmv->name);
244 devstat_add_entry(&dmv->stats, name, 0, DEV_BSIZE,
245 DEVSTAT_NO_ORDERED_TAGS,
246 DEVSTAT_TYPE_DIRECT | DEVSTAT_TYPE_IF_OTHER,
247 DEVSTAT_PRIORITY_DISK);
249 dmv->devt = disk_create_named(name_buf, dm_minor, dmv->diskp, &dm_ops);
250 reference_dev(dmv->devt);
252 dmv->minor = minor(dmv->devt);
253 udev_dict_set_cstr(dmv->devt, "subsystem", "disk");
255 if ((r = dm_dev_insert(dmv)) != 0)
258 /* Increment device counter After creating device */
259 ++dm_dev_counter; /* XXX: was atomic 64 */
266 dm_dev_destroy(dm_dev_t *dmv)
270 /* Destroy active table first. */
271 dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
273 /* Destroy inactive table if exits, too. */
274 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
276 dm_table_head_destroy(&dmv->table_head);
278 minor = dkunit(dmv->devt);
279 disk_destroy(dmv->diskp);
280 devstat_remove_entry(&dmv->stats);
282 release_dev(dmv->devt);
283 devfs_clone_bitmap_put(&dm_minor_bitmap, minor);
285 lockuninit(&dmv->dev_mtx);
286 cv_destroy(&dmv->dev_cv);
289 (void)dm_dev_free(dmv);
291 /* Decrement device counter After removing device */
292 --dm_dev_counter; /* XXX: was atomic 64 */
298 * dm_detach is called to completely destroy & remove a dm disk device.
301 dm_dev_remove(dm_dev_t *dmv)
303 /* Remove device from list and wait for refcnt to drop to zero */
304 dm_dev_rem(dmv, NULL, NULL, -1);
306 /* Destroy and free the device */
313 dm_dev_remove_all(int gentle)
315 dm_dev_t *dmv, *dmv2;
320 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
322 TAILQ_FOREACH_MUTABLE(dmv, &dm_dev_list, next_devlist, dmv2) {
323 if (gentle && dmv->is_open) {
331 lockmgr(&dm_dev_mutex, LK_RELEASE);
337 * Allocate new device entry.
344 dmv = kmalloc(sizeof(dm_dev_t), M_DM, M_WAITOK | M_ZERO);
347 dmv->diskp = kmalloc(sizeof(struct disk), M_DM, M_WAITOK | M_ZERO);
352 * Freed device entry.
355 dm_dev_free(dm_dev_t * dmv)
357 KKASSERT(dmv != NULL);
359 if (dmv->diskp != NULL)
360 (void) kfree(dmv->diskp, M_DM);
362 (void) kfree(dmv, M_DM);
368 dm_dev_busy(dm_dev_t * dmv)
370 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
372 lockmgr(&dmv->dev_mtx, LK_RELEASE);
376 dm_dev_unbusy(dm_dev_t * dmv)
378 KKASSERT(dmv->ref_cnt != 0);
380 lockmgr(&dmv->dev_mtx, LK_EXCLUSIVE);
381 if (--dmv->ref_cnt == 0)
382 cv_broadcast(&dmv->dev_cv);
383 lockmgr(&dmv->dev_mtx, LK_RELEASE);
386 * Return prop_array of dm_targer_list dictionaries.
389 dm_dev_prop_list(void)
392 prop_array_t dev_array;
393 prop_dictionary_t dev_dict;
395 dev_array = prop_array_create();
397 lockmgr(&dm_dev_mutex, LK_EXCLUSIVE);
399 TAILQ_FOREACH(dmv, &dm_dev_list, next_devlist) {
400 dev_dict = prop_dictionary_create();
402 prop_dictionary_set_cstring(dev_dict, DM_DEV_NAME, dmv->name);
403 prop_dictionary_set_uint32(dev_dict, DM_DEV_DEV, dmv->minor);
405 prop_array_add(dev_array, dev_dict);
406 prop_object_release(dev_dict);
409 lockmgr(&dm_dev_mutex, LK_RELEASE);
413 * Initialize global device mutex.
418 TAILQ_INIT(&dm_dev_list); /* initialize global dev list */
419 lockinit(&dm_dev_mutex, "dmdevlist", 0, LK_CANRECURSE);
420 devfs_clone_bitmap_init(&dm_minor_bitmap);
425 * Destroy all devices created in device-mapper. Remove all tables
426 * free all allocated memmory.
431 /* Force removal of all devices */
432 dm_dev_remove_all(0);
434 lockuninit(&dm_dev_mutex);