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: head/sys/geom/geom_dev.c 94287 2002-04-09 15:43:32Z phk $
|
| 35 * $FreeBSD: head/sys/geom/geom_dev.c 95038 2002-04-19 09:24:12Z phk $ |
36 */
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/malloc.h>
41#include <sys/kernel.h>
42#include <sys/conf.h>
43#include <sys/bio.h>
44#include <sys/lock.h>
45#include <sys/mutex.h>
46#include <sys/errno.h>
47#include <sys/time.h>
48#include <sys/disk.h>
49#include <sys/fcntl.h>
50#include <geom/geom.h>
|
| 51#include <machine/limits.h> |
52
53#define CDEV_MAJOR 4
54
55static d_open_t g_dev_open;
56static d_close_t g_dev_close;
57static d_strategy_t g_dev_strategy;
58static d_ioctl_t g_dev_ioctl;
59static d_psize_t g_dev_psize;
60
61static struct cdevsw g_dev_cdevsw = {
62 /* open */ g_dev_open,
63 /* close */ g_dev_close,
64 /* read */ physread,
65 /* write */ physwrite,
66 /* ioctl */ g_dev_ioctl,
67 /* poll */ nopoll,
68 /* mmap */ nommap,
69 /* strategy */ g_dev_strategy,
70 /* name */ "g_dev",
71 /* maj */ CDEV_MAJOR,
72 /* dump */ nodump,
73 /* psize */ g_dev_psize,
74 /* flags */ D_DISK | D_CANFREE | D_TRACKCLOSE,
75};
76
77static g_taste_t g_dev_taste;
78static g_orphan_t g_dev_orphan;
79
80static struct g_class g_dev_class = {
81 "DEV-class",
82 g_dev_taste,
83 NULL,
84 G_CLASS_INITSTUFF
85};
86
87static void
88g_dev_clone(void *arg, char *name, int namelen, dev_t *dev)
89{
90 struct g_geom *gp;
91
92 if (*dev != NODEV)
93 return;
94
95 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s)", name);
96 g_rattle();
97
98 /* XXX: can I drop Giant here ??? */
99 /* g_topology_lock(); */
100 LIST_FOREACH(gp, &g_dev_class.geom, geom) {
101 if (strcmp(gp->name, name))
102 continue;
103 *dev = gp->softc;
104 g_trace(G_T_TOPOLOGY, "g_dev_clone(%s) = %p", name, *dev);
105 return;
106 }
107 /* g_topology_unlock(); */
108 return;
109}
110
111static void
112g_dev_register_cloner(void *foo __unused)
113{
114 static int once;
115
116 if (!once) {
117 if (!once)
118 EVENTHANDLER_REGISTER(dev_clone, g_dev_clone, 0, 1000);
119 once++;
120 }
121}
122
123SYSINIT(geomdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE,g_dev_register_cloner,NULL);
124
125static struct g_geom *
126g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
127{
128 struct g_geom *gp;
129 struct g_consumer *cp;
130 static int unit;
131 u_int secsize;
132 off_t mediasize;
133 int error, j;
134 dev_t dev;
135
136 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
137 g_topology_assert();
138 LIST_FOREACH(cp, &pp->consumers, consumers)
139 if (cp->geom->class == mp)
140 return (NULL);
141 gp = g_new_geomf(mp, pp->name);
142 gp->orphan = g_dev_orphan;
143 cp = g_new_consumer(gp);
144 g_attach(cp, pp);
145 error = g_access_rel(cp, 1, 0, 0);
146 g_topology_unlock();
147 if (!error) {
148 j = sizeof secsize;
149 error = g_io_getattr("GEOM::sectorsize", cp, &j, &secsize);
150 if (error) {
151 secsize = 512;
152 printf("g_dev_taste: error %d Sectors are %d bytes\n",
153 error, secsize);
154 }
155 j = sizeof mediasize;
156 error = g_io_getattr("GEOM::mediasize", cp, &j, &mediasize);
157 if (error) {
158 mediasize = 0;
159 printf("g_dev_taste: error %d Mediasize is %lld bytes\n",
160 error, (long long)mediasize);
161 }
162 g_topology_lock();
163 g_access_rel(cp, -1, 0, 0);
164 g_topology_unlock();
165 } else {
166 secsize = 512;
167 mediasize = 0;
168 }
169 mtx_lock(&Giant);
170 if (mediasize != 0)
171 printf("GEOM: \"%s\" %lld bytes in %lld sectors of %u bytes\n",
172 pp->name, (long long)mediasize,
173 (long long)mediasize / secsize, secsize);
174 else
175 printf("GEOM: \"%s\" (size unavailable)\n", pp->name);
176 dev = make_dev(&g_dev_cdevsw, unit++,
177 UID_ROOT, GID_WHEEL, 0600, gp->name);
178 gp->softc = dev;
179 dev->si_drv1 = gp;
180 dev->si_drv2 = cp;
181 mtx_unlock(&Giant);
182 g_topology_lock();
183 return (gp);
184}
185
186static int
187g_dev_open(dev_t dev, int flags, int fmt, struct thread *td)
188{
189 struct g_geom *gp;
190 struct g_consumer *cp;
191 int error, r, w, e;
192
193 gp = dev->si_drv1;
194 cp = dev->si_drv2;
195 if (gp == NULL || cp == NULL)
196 return(ENXIO);
197 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
198 gp->name, flags, fmt, td);
199 DROP_GIANT();
200 g_topology_lock();
201 g_silence();
202 r = flags & FREAD ? 1 : 0;
203 w = flags & FWRITE ? 1 : 0;
204 e = flags & O_EXCL ? 1 : 0;
205 error = g_access_rel(cp, r, w, e);
206 g_topology_unlock();
207 PICKUP_GIANT();
208 g_rattle();
209 return(error);
210}
211
212static int
213g_dev_close(dev_t dev, int flags, int fmt, struct thread *td)
214{
215 struct g_geom *gp;
216 struct g_consumer *cp;
217 int error, r, w, e;
218
219 gp = dev->si_drv1;
220 cp = dev->si_drv2;
221 if (gp == NULL || cp == NULL)
222 return(ENXIO);
223 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
224 gp->name, flags, fmt, td);
225 DROP_GIANT();
226 g_topology_lock();
227 g_silence();
228 r = flags & FREAD ? -1 : 0;
229 w = flags & FWRITE ? -1 : 0;
230 e = flags & O_EXCL ? -1 : 0;
231 error = g_access_rel(cp, r, w, e);
232 g_topology_unlock();
233 PICKUP_GIANT();
234 g_rattle();
235 return (error);
236}
237
238static int
239g_dev_ioctl(dev_t dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
240{
241 struct g_geom *gp;
242 struct g_consumer *cp;
|
| 243 struct g_kerneldump kd; |
244 int i, error;
|
| 245 u_int u; |
246 struct g_ioctl *gio;
247
248 gp = dev->si_drv1;
249 cp = dev->si_drv2;
250
251 error = 0;
252 DROP_GIANT();
253
254 i = IOCPARM_LEN(cmd);
255 switch (cmd) {
256 case DIOCGSECTORSIZE:
257 error = g_io_getattr("GEOM::sectorsize", cp, &i, data);
258 break;
259 case DIOCGMEDIASIZE:
260 error = g_io_getattr("GEOM::mediasize", cp, &i, data);
261 break;
262 case DIOCGFWSECTORS:
263 error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
264 break;
265 case DIOCGFWHEADS:
266 error = g_io_getattr("GEOM::fwheads", cp, &i, data);
267 break;
268 case DIOCGFRONTSTUFF:
269 error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
270 break;
|
271 case DIOCSKERNELDUMP:
272 u = *((u_int *)data);
273 if (!u) {
274 set_dumper(NULL);
275 error = 0;
276 break;
277 }
278 kd.offset = 0;
279 kd.length = OFF_MAX;
280 i = sizeof kd;
281 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd);
282 if (!error)
283 dev->si_flags |= SI_DUMPDEV;
284 break; |
285 default:
286 gio = g_malloc(sizeof *gio, M_WAITOK);
287 gio->cmd = cmd;
288 gio->data = data;
289 gio->fflag = fflag;
290 gio->td = td;
291 i = sizeof *gio;
292 if (cmd & IOC_IN)
293 error = g_io_setattr("GEOM::ioctl", cp, i, gio);
294 else
295 error = g_io_getattr("GEOM::ioctl", cp, &i, gio);
296 g_free(gio);
297 break;
298 }
299
300 if (error != 0 && cmd == DIOCGDVIRGIN) {
301 g_topology_lock();
302 gp = g_create_geomf("BSD-class", cp->provider, NULL);
303 g_topology_unlock();
304 }
305 PICKUP_GIANT();
306 g_rattle();
307 if (error == ENOIOCTL) {
308 i = IOCGROUP(cmd);
309 printf("IOCTL(0x%lx) \"%s\"", cmd, gp->name);
310 if (i > ' ' && i <= '~')
311 printf(" '%c'", (int)IOCGROUP(cmd));
312 else
313 printf(" 0x%lx", IOCGROUP(cmd));
314 printf("/%ld ", cmd & 0xff);
315 if (cmd & IOC_IN)
316 printf("I");
317 if (cmd & IOC_OUT)
318 printf("O");
319 printf("(%ld) = ENOIOCTL\n", IOCPARM_LEN(cmd));
320 error = ENOTTY;
321 }
322 return (error);
323}
324
325static int
326g_dev_psize(dev_t dev)
327{
328 struct g_consumer *cp;
329 int i, error;
330 off_t mediasize;
331
332 cp = dev->si_drv2;
333
334 i = sizeof mediasize;
335 error = g_io_getattr("GEOM::mediasize", cp, &i, &mediasize);
336 if (error)
337 return (-1);
338 return (mediasize >> DEV_BSHIFT);
339}
340
341static void
342g_dev_done(struct bio *bp2)
343{
344 struct bio *bp;
345
346 bp = bp2->bio_linkage;
347 bp->bio_error = bp2->bio_error;
348 if (bp->bio_error != 0) {
349 g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
350 bp2, bp->bio_error);
351 bp->bio_flags |= BIO_ERROR;
352 } else {
353 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %lld",
354 bp2, bp, bp->bio_resid, bp2->bio_completed);
355 }
356 bp->bio_resid = bp->bio_bcount - bp2->bio_completed;
357 g_destroy_bio(bp2);
358 mtx_lock(&Giant);
359 biodone(bp);
360 mtx_unlock(&Giant);
361}
362
363static void
364g_dev_strategy(struct bio *bp)
365{
366 struct g_geom *gp;
367 struct g_consumer *cp;
368 struct bio *bp2;
369 dev_t dev;
370
371 dev = bp->bio_dev;
372 gp = dev->si_drv1;
373 cp = dev->si_drv2;
374 bp2 = g_clone_bio(bp);
375 bp2->bio_offset = (off_t)bp->bio_blkno << DEV_BSHIFT;
376 bp2->bio_length = (off_t)bp->bio_bcount;
377 bp2->bio_done = g_dev_done;
378 g_trace(G_T_BIO,
379 "g_dev_strategy(%p/%p) offset %lld length %lld data %p cmd %d",
380 bp, bp2, bp->bio_offset, bp2->bio_length, bp2->bio_data,
381 bp2->bio_cmd);
382 g_io_request(bp2, cp);
383}
384
385
386static void
387g_dev_orphan(struct g_consumer *cp)
388{
389 struct g_geom *gp;
390 dev_t dev;
391
392 gp = cp->geom;
393 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, gp->name);
394 g_topology_assert();
395 if (cp->biocount > 0)
396 return;
397 dev = gp->softc;
|
398 if (dev->si_flags & SI_DUMPDEV)
399 set_dumper(NULL); |
400 destroy_dev(dev);
401 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
402 g_access_rel(cp, -cp->acr, -cp->acw, -cp->ace);
403 g_dettach(cp);
404 g_destroy_consumer(cp);
405 g_destroy_geom(gp);
406}
407
408DECLARE_GEOM_CLASS(g_dev_class, g_dev)
409
|