FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_disk.c
1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
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.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
21 * permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: releng/5.0/sys/geom/geom_disk.c 108141 2002-12-20 21:52:03Z phk $
36 */
37
38 #include "opt_geom.h"
39 #ifndef NO_GEOM
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/bio.h>
46 #include <sys/conf.h>
47 #include <sys/disk.h>
48 #include <sys/diskslice.h>
49 #include <sys/disklabel.h>
50 #include <sys/malloc.h>
51 #include <sys/sysctl.h>
52 #include <sys/stdint.h>
53 #include <machine/md_var.h>
54
55
56 #include <sys/lock.h>
57 #include <sys/mutex.h>
58 #include <geom/geom.h>
59
60 static g_access_t g_disk_access;
61
62 struct g_class g_disk_class = {
63 "DISK",
64 NULL,
65 NULL,
66 G_CLASS_INITIALIZER
67 };
68
69 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
70
71 static int
72 g_disk_access(struct g_provider *pp, int r, int w, int e)
73 {
74 struct disk *dp;
75 dev_t dev;
76 int error;
77
78 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
79 pp->name, r, w, e);
80 g_topology_assert();
81 r += pp->acr;
82 w += pp->acw;
83 e += pp->ace;
84 dp = pp->geom->softc;
85 dev = dp->d_dev;
86 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
87 mtx_lock(&Giant);
88 error = devsw(dev)->d_open(dev, 3, 0, NULL);
89 if (error != 0)
90 printf("Opened disk %s -> %d\n", pp->name, error);
91 mtx_unlock(&Giant);
92 pp->mediasize = dp->d_mediasize;
93 pp->sectorsize = dp->d_sectorsize;
94 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
95 mtx_lock(&Giant);
96 error = devsw(dev)->d_close(dev, 3, 0, NULL);
97 if (error != 0)
98 printf("Closed disk %s -> %d\n", pp->name, error);
99 mtx_unlock(&Giant);
100 } else {
101 error = 0;
102 }
103 return (error);
104 }
105
106 static void
107 g_disk_kerneldump(struct bio *bp, struct disk *dp)
108 {
109 int error;
110 struct g_kerneldump *gkd;
111 struct dumperinfo di;
112 struct g_geom *gp;
113
114 gkd = (struct g_kerneldump*)bp->bio_data;
115 gp = bp->bio_to->geom;
116 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
117 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
118 di.dumper = (dumper_t *)dp->d_devsw->d_dump;
119 di.priv = dp->d_dev;
120 di.blocksize = dp->d_sectorsize;
121 di.mediaoffset = gkd->offset;
122 di.mediasize = gkd->length;
123 error = set_dumper(&di);
124 g_io_deliver(bp, error);
125 }
126
127 static void
128 g_disk_done(struct bio *bp)
129 {
130
131 mtx_unlock(&Giant);
132 bp->bio_completed = bp->bio_length - bp->bio_resid;
133 g_std_done(bp);
134 mtx_lock(&Giant);
135 }
136
137 static void
138 g_disk_start(struct bio *bp)
139 {
140 struct bio *bp2;
141 dev_t dev;
142 struct disk *dp;
143 struct g_ioctl *gio;
144 int error;
145
146 dp = bp->bio_to->geom->softc;
147 dev = dp->d_dev;
148 error = EJUSTRETURN;
149 switch(bp->bio_cmd) {
150 case BIO_DELETE:
151 if (!(devsw(dev)->d_flags & D_CANFREE)) {
152 error = 0;
153 break;
154 }
155 /* fall-through */
156 case BIO_READ:
157 case BIO_WRITE:
158 bp2 = g_clone_bio(bp);
159 bp2->bio_done = g_disk_done;
160 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
161 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
162 bp2->bio_bcount = bp2->bio_length;
163 bp2->bio_dev = dev;
164 mtx_lock(&Giant);
165 devsw(dev)->d_strategy(bp2);
166 mtx_unlock(&Giant);
167 break;
168 case BIO_GETATTR:
169 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
170 break;
171 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
172 break;
173 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
174 break;
175 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
176 g_disk_kerneldump(bp, dp);
177 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
178 bp->bio_length == sizeof *gio) {
179 gio = (struct g_ioctl *)bp->bio_data;
180 gio->func = devsw(dp->d_dev)->d_ioctl;
181 gio->dev = dp->d_dev;
182 error = EDIRIOCTL;
183 } else
184 error = ENOIOCTL;
185 break;
186 case BIO_SETATTR:
187 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
188 bp->bio_length == sizeof *gio) {
189 gio = (struct g_ioctl *)bp->bio_data;
190 gio->func = devsw(dp->d_dev)->d_ioctl;
191 gio->dev = dp->d_dev;
192 error = EDIRIOCTL;
193 } else
194 error = ENOIOCTL;
195 break;
196 default:
197 error = EOPNOTSUPP;
198 break;
199 }
200 if (error != EJUSTRETURN)
201 g_io_deliver(bp, error);
202 return;
203 }
204
205 static void
206 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
207 {
208 struct disk *dp;
209
210 dp = gp->softc;
211 if (indent == NULL) {
212 sbuf_printf(sb, " hd %u", dp->d_fwheads);
213 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
214 return;
215 }
216 if (pp != NULL) {
217 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
218 indent, dp->d_fwheads);
219 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
220 indent, dp->d_fwsectors);
221 }
222 }
223
224 static void
225 g_disk_create(void *arg)
226 {
227 struct g_geom *gp;
228 struct g_provider *pp;
229 dev_t dev;
230
231 g_topology_assert();
232 dev = arg;
233 gp = g_new_geomf(&g_disk_class, dev->si_name);
234 gp->start = g_disk_start;
235 gp->access = g_disk_access;
236 gp->softc = dev->si_disk;
237 gp->dumpconf = g_disk_dumpconf;
238 dev->si_disk->d_softc = gp;
239 pp = g_new_providerf(gp, "%s", gp->name);
240 pp->mediasize = dev->si_disk->d_mediasize;
241 pp->sectorsize = dev->si_disk->d_sectorsize;
242 g_error_provider(pp, 0);
243 if (bootverbose)
244 printf("GEOM: new disk %s\n", gp->name);
245 }
246
247
248
249 dev_t
250 disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
251 {
252 dev_t dev;
253
254 dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO);
255 dp->d_dev = dev;
256 dp->d_devsw = cdevsw;
257 dev->si_devsw = cdevsw;
258 dev->si_disk = dp;
259 dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART);
260 sprintf(dev->si_name, "%s%d", cdevsw->d_name, unit);
261 g_call_me(g_disk_create, dev);
262 return (dev);
263 }
264
265 void disk_dev_synth(dev_t dev);
266
267 void
268 disk_dev_synth(dev_t dev)
269 {
270
271 return;
272 }
273
274 void
275 disk_destroy(dev_t dev)
276 {
277 struct disk *dp;
278 struct g_geom *gp;
279
280 dp = dev->si_disk;
281 gp = dp->d_softc;
282 g_free(dev);
283 gp->flags |= G_GEOM_WITHER;
284 g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO);
285 }
286
287 void
288 disk_invalidate (struct disk *disk)
289 {
290 }
291
292 static void
293 g_kern_disks(void *p)
294 {
295 struct sbuf *sb;
296 struct g_geom *gp;
297 char *sp;
298
299 sb = p;
300 sp = "";
301 g_topology_assert();
302 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
303 sbuf_printf(sb, "%s%s", sp, gp->name);
304 sp = " ";
305 }
306 sbuf_finish(sb);
307 wakeup(sb);
308 }
309
310 static int
311 sysctl_disks(SYSCTL_HANDLER_ARGS)
312 {
313 int error;
314 struct sbuf *sb;
315
316 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
317 sbuf_clear(sb);
318 g_call_me(g_kern_disks, sb);
319 do {
320 tsleep(sb, PZERO, "kern.disks", hz);
321 } while(!sbuf_done(sb));
322 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
323 sbuf_delete(sb);
324 return error;
325 }
326
327 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
328 sysctl_disks, "A", "names of available disks");
329
330 #endif
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