1 /* $NetBSD: dm_pdev.c,v 1.6 2010/01/04 00:19:08 haad Exp $ */
4 * Copyright (c) 2010-2011 Alex Hornung <alex@alexhornung.com>
5 * Copyright (c) 2008 The NetBSD Foundation, Inc.
8 * This code is derived from software contributed to The NetBSD Foundation
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/types.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>
42 #include <dev/disk/dm/dm.h>
44 TAILQ_HEAD(dm_pdevs, dm_pdev) dm_pdev_list;
46 static 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.
54 * needs to be called with the dm_pdev_mutex held.
57 dm_pdev_lookup_name(const char *dm_pdev_name)
61 KKASSERT(dm_pdev_name != NULL);
63 TAILQ_FOREACH(dmp, &dm_pdev_list, next_pdev) {
64 if (strcmp(dm_pdev_name, dmp->name) == 0)
72 dm_dk_lookup(const char *dev_name, struct vnode **vpp)
74 struct nlookupdata nd;
77 error = nlookup_init(&nd, dev_name, UIO_SYSSPACE, NLC_FOLLOW);
81 error = vn_open(&nd, NULL, FREAD|FWRITE, 0);
95 * Since dm can have arbitrary stacking on any number of disks and any dm
96 * volume is at least stacked onto another disk, we need to adjust the
97 * dumping offset (which is a raw offset from the beginning of the lowest
98 * physical disk) taking into account the offset of the underlying device
99 * which in turn takes into account the offset below it, etc.
101 * This function adjusts the dumping offset that is passed to the next
102 * dev_ddump() so it is correct for that underlying device.
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 TAILQ I will only increment
123 dm_pdev_insert(const char *dev_name)
129 KKASSERT(dev_name != NULL);
131 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
132 dmp = dm_pdev_lookup_name(dev_name);
136 aprint_debug("dmp_pdev_insert pdev %s already in tree\n", dev_name);
137 lockmgr(&dm_pdev_mutex, LK_RELEASE);
141 if ((dmp = dm_pdev_alloc(dev_name)) == NULL) {
142 lockmgr(&dm_pdev_mutex, LK_RELEASE);
146 error = dm_dk_lookup(dev_name, &dmp->pdev_vnode);
148 aprint_debug("dk_lookup on device: %s failed with error %d!\n",
151 lockmgr(&dm_pdev_mutex, LK_RELEASE);
156 if (dm_pdev_get_vattr(dmp, &va) == -1) {
157 aprint_debug("makeudev %s failed\n", dev_name);
159 lockmgr(&dm_pdev_mutex, LK_RELEASE);
162 ksnprintf(dmp->udev_name, sizeof(dmp->udev_name),
163 "%d:%d", va.va_rmajor, va.va_rminor);
166 * Get us the partinfo from the underlying device, it's needed for
169 bzero(&dmp->pdev_pinfo, sizeof(dmp->pdev_pinfo));
170 error = dev_dioctl(dmp->pdev_vnode->v_rdev, DIOCGPART,
171 (void *)&dmp->pdev_pinfo, 0, proc0.p_ucred, NULL, NULL);
173 struct partinfo *dpart = &dmp->pdev_pinfo;
174 aprint_debug("dmp_pdev_insert DIOCGPART "
175 "offset=%ju size=%ju blocks=%ju blksize=%d\n",
179 dpart->media_blksize);
181 kprintf("dmp_pdev_insert DIOCGPART failed %d\n", error);
184 TAILQ_INSERT_TAIL(&dm_pdev_list, dmp, next_pdev);
185 lockmgr(&dm_pdev_mutex, LK_RELEASE);
187 aprint_debug("dmp_pdev_insert pdev %s %s\n",
188 dmp->name, dmp->udev_name);
194 * Allocat new pdev structure if is not already present and
198 dm_pdev_alloc(const char *name)
202 if ((dmp = kmalloc(sizeof(dm_pdev_t), M_DM, M_WAITOK | M_ZERO)) == NULL)
205 strlcpy(dmp->name, name, MAX_DEV_NAME);
208 dmp->pdev_vnode = NULL;
213 * Destroy allocated dm_pdev.
216 dm_pdev_rem(dm_pdev_t *dmp)
220 KKASSERT(dmp != NULL);
222 if (dmp->pdev_vnode != NULL) {
223 err = vn_close(dmp->pdev_vnode, FREAD | FWRITE, NULL);
233 * This funcion is called from dm_dev_remove_ioctl.
234 * When I'm removing device from list, I have to decrement
235 * reference counter. If reference counter is 0 I will remove
236 * dmp from global list and from device list to. And I will CLOSE
241 * Decrement pdev reference counter if 0 remove it.
244 dm_pdev_decr(dm_pdev_t *dmp)
246 KKASSERT(dmp != NULL);
248 * If this was last reference remove dmp from
251 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
253 if (--dmp->ref_cnt == 0) {
254 TAILQ_REMOVE(&dm_pdev_list, dmp, next_pdev);
255 lockmgr(&dm_pdev_mutex, LK_RELEASE);
259 lockmgr(&dm_pdev_mutex, LK_RELEASE);
264 dm_pdev_get_udev(dm_pdev_t *dmp)
269 if (dmp->pdev_vnode == NULL)
272 ret = dm_pdev_get_vattr(dmp, &va);
276 ret = makeudev(va.va_rmajor, va.va_rminor);
282 dm_pdev_get_vattr(dm_pdev_t *dmp, struct vattr *vap)
286 if (dmp->pdev_vnode == NULL)
290 ret = VOP_GETATTR(dmp->pdev_vnode, vap);
298 * Initialize pdev subsystem.
303 TAILQ_INIT(&dm_pdev_list); /* initialize global pdev list */
304 lockinit(&dm_pdev_mutex, "dmpdev", 0, LK_CANRECURSE);
310 * Destroy all existing pdev's in device-mapper.
317 lockmgr(&dm_pdev_mutex, LK_EXCLUSIVE);
319 while ((dmp = TAILQ_FIRST(&dm_pdev_list)) != NULL) {
320 TAILQ_REMOVE(&dm_pdev_list, dmp, next_pdev);
323 KKASSERT(TAILQ_EMPTY(&dm_pdev_list));
325 lockmgr(&dm_pdev_mutex, LK_RELEASE);
327 lockuninit(&dm_pdev_mutex);