1 /* $NetBSD: dm_pdev.c,v 1.6 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/fcntl.h>
37 #include <sys/malloc.h>
38 #include <sys/namei.h>
39 #include <sys/vnode.h>
40 #include <sys/nlookup.h>
44 SLIST_HEAD(dm_pdevs, dm_pdev) dm_pdev_list;
46 struct lock dm_pdev_mutex;
48 static dm_pdev_t *dm_pdev_alloc(const char *);
49 static int dm_pdev_rem(dm_pdev_t *);
50 static dm_pdev_t *dm_pdev_lookup_name(const char *);
53 * Find used pdev with name == dm_pdev_name.
56 dm_pdev_lookup_name(const char *dm_pdev_name)
62 KKASSERT(dm_pdev_name != NULL);
64 slen = strlen(dm_pdev_name);
66 SLIST_FOREACH(dm_pdev, &dm_pdev_list, next_pdev) {
67 dlen = strlen(dm_pdev->name);
72 if (strncmp(dm_pdev_name, dm_pdev->name, slen) == 0)
80 dm_dk_lookup(const char *dev_name, struct vnode **vpp)
82 struct nlookupdata nd;
86 if (this is a root mount) {
87 error = vn_opendisk(dev_name, FREAD|FWRITE, vpp);
92 error = nlookup_init(&nd, dev_name, UIO_SYSSPACE, NLC_FOLLOW);
96 error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
105 dm_pdev_correct_dump_offset(dm_pdev_t *pdev, off_t offset)
109 noffset = pdev->pdev_pinfo.reserved_blocks +
110 pdev->pdev_pinfo.media_offset / pdev->pdev_pinfo.media_blksize;
111 noffset *= DEV_BSIZE;
118 * Create entry for device with name dev_name and open vnode for it.
119 * If entry already exists in global SLIST I will only increment
123 dm_pdev_insert(const char *dev_name)
128 KKASSERT(dev_name != NULL);
130 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
131 dmp = dm_pdev_lookup_name(dev_name);
135 aprint_debug("dmp_pdev_insert pdev %s already in tree\n", dev_name);
136 lockmgr(&dm_pdev_mutex, LK_RELEASE);
139 lockmgr(&dm_pdev_mutex, LK_RELEASE);
141 if ((dmp = dm_pdev_alloc(dev_name)) == NULL)
144 /* XXX: nlookup and/or vn_opendisk */
145 error = dm_dk_lookup(dev_name, &dmp->pdev_vnode);
147 aprint_debug("dk_lookup on device: %s failed with error %d!\n",
155 * Get us the partinfo from the underlying device, it's needed for
158 bzero(&dmp->pdev_pinfo, sizeof(dmp->pdev_pinfo));
159 error = dev_dioctl(dmp->pdev_vnode->v_rdev, DIOCGPART,
160 (void *)&dmp->pdev_pinfo, 0, proc0.p_ucred, NULL);
162 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
163 SLIST_INSERT_HEAD(&dm_pdev_list, dmp, next_pdev);
164 lockmgr(&dm_pdev_mutex, LK_RELEASE);
169 * Initialize pdev subsystem.
174 SLIST_INIT(&dm_pdev_list); /* initialize global pdev list */
175 lockinit(&dm_pdev_mutex, "dmpdev", 0, LK_CANRECURSE);
180 * Allocat new pdev structure if is not already present and
184 dm_pdev_alloc(const char *name)
188 if ((dmp = kmalloc(sizeof(dm_pdev_t), M_DM, M_WAITOK | M_ZERO)) == NULL)
191 strlcpy(dmp->name, name, MAX_DEV_NAME);
194 dmp->pdev_vnode = NULL;
199 * Destroy allocated dm_pdev.
202 dm_pdev_rem(dm_pdev_t * dmp)
206 KKASSERT(dmp != NULL);
208 if (dmp->pdev_vnode != NULL) {
209 err = vn_close(dmp->pdev_vnode, FREAD | FWRITE);
219 * Destroy all existing pdev's in device-mapper.
222 dm_pdev_destroy(void)
226 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
227 while (!SLIST_EMPTY(&dm_pdev_list)) { /* List Deletion. */
229 dm_pdev = SLIST_FIRST(&dm_pdev_list);
231 SLIST_REMOVE_HEAD(&dm_pdev_list, next_pdev);
233 dm_pdev_rem(dm_pdev);
235 lockmgr(&dm_pdev_mutex, LK_RELEASE);
237 lockuninit(&dm_pdev_mutex);
241 * This funcion is called from dm_dev_remove_ioctl.
242 * When I'm removing device from list, I have to decrement
243 * reference counter. If reference counter is 0 I will remove
244 * dmp from global list and from device list to. And I will CLOSE
249 * Decrement pdev reference counter if 0 remove it.
252 dm_pdev_decr(dm_pdev_t * dmp)
254 KKASSERT(dmp != NULL);
256 * If this was last reference remove dmp from
259 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
261 if (--dmp->ref_cnt == 0) {
262 SLIST_REMOVE(&dm_pdev_list, dmp, dm_pdev, next_pdev);
263 lockmgr(&dm_pdev_mutex, LK_RELEASE);
267 lockmgr(&dm_pdev_mutex, LK_RELEASE);
271 dm_pdev_dump_list(void)
275 aprint_verbose("Dumping dm_pdev_list \n");
277 SLIST_FOREACH(dmp, &dm_pdev_list, next_pdev) {
278 aprint_verbose("dm_pdev_name %s ref_cnt %d list_rf_cnt %d\n",
279 dmp->name, dmp->ref_cnt, dmp->list_ref_cnt);