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
36#include <sys/cdefs.h>
| 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
36#include <sys/cdefs.h>
|
38
39#include "opt_geom.h"
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/fcntl.h>
48#include <sys/malloc.h>
49#include <sys/sysctl.h>
50#include <sys/devicestat.h>
51#include <machine/md_var.h>
52
53#include <sys/lock.h>
54#include <sys/mutex.h>
55#include <geom/geom.h>
56#include <geom/geom_disk.h>
57#include <geom/geom_int.h>
58
59static struct mtx g_disk_done_mtx;
60
61static g_access_t g_disk_access;
62static g_init_t g_disk_init;
63static g_fini_t g_disk_fini;
64static g_start_t g_disk_start;
65static g_ioctl_t g_disk_ioctl;
66static g_dumpconf_t g_disk_dumpconf;
67
68static struct g_class g_disk_class = {
69 .name = "DISK",
70 .version = G_VERSION,
71 .init = g_disk_init,
72 .fini = g_disk_fini,
73 .start = g_disk_start,
74 .access = g_disk_access,
75 .ioctl = g_disk_ioctl,
76 .dumpconf = g_disk_dumpconf,
77};
78
79static void
80g_disk_init(struct g_class *mp __unused)
81{
82
83 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
84}
85
86static void
87g_disk_fini(struct g_class *mp __unused)
88{
89
90 mtx_destroy(&g_disk_done_mtx);
91}
92
93DECLARE_GEOM_CLASS(g_disk_class, g_disk);
94
95static void __inline
96g_disk_lock_giant(struct disk *dp)
97{
98 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
99 mtx_lock(&Giant);
100}
101
102static void __inline
103g_disk_unlock_giant(struct disk *dp)
104{
105 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
106 mtx_unlock(&Giant);
107}
108
109static int
110g_disk_access(struct g_provider *pp, int r, int w, int e)
111{
112 struct disk *dp;
113 int error;
114
115 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
116 pp->name, r, w, e);
117 g_topology_assert();
118 dp = pp->geom->softc;
119 if (dp == NULL || dp->d_destroyed) {
120 /*
121 * Allow decreasing access count even if disk is not
122 * avaliable anymore.
123 */
124 if (r <= 0 && w <= 0 && e <= 0)
125 return (0);
126 return (ENXIO);
127 }
128 r += pp->acr;
129 w += pp->acw;
130 e += pp->ace;
131 error = 0;
132 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
133 if (dp->d_open != NULL) {
134 g_disk_lock_giant(dp);
135 error = dp->d_open(dp);
| 38
39#include "opt_geom.h"
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/fcntl.h>
48#include <sys/malloc.h>
49#include <sys/sysctl.h>
50#include <sys/devicestat.h>
51#include <machine/md_var.h>
52
53#include <sys/lock.h>
54#include <sys/mutex.h>
55#include <geom/geom.h>
56#include <geom/geom_disk.h>
57#include <geom/geom_int.h>
58
59static struct mtx g_disk_done_mtx;
60
61static g_access_t g_disk_access;
62static g_init_t g_disk_init;
63static g_fini_t g_disk_fini;
64static g_start_t g_disk_start;
65static g_ioctl_t g_disk_ioctl;
66static g_dumpconf_t g_disk_dumpconf;
67
68static struct g_class g_disk_class = {
69 .name = "DISK",
70 .version = G_VERSION,
71 .init = g_disk_init,
72 .fini = g_disk_fini,
73 .start = g_disk_start,
74 .access = g_disk_access,
75 .ioctl = g_disk_ioctl,
76 .dumpconf = g_disk_dumpconf,
77};
78
79static void
80g_disk_init(struct g_class *mp __unused)
81{
82
83 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
84}
85
86static void
87g_disk_fini(struct g_class *mp __unused)
88{
89
90 mtx_destroy(&g_disk_done_mtx);
91}
92
93DECLARE_GEOM_CLASS(g_disk_class, g_disk);
94
95static void __inline
96g_disk_lock_giant(struct disk *dp)
97{
98 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
99 mtx_lock(&Giant);
100}
101
102static void __inline
103g_disk_unlock_giant(struct disk *dp)
104{
105 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
106 mtx_unlock(&Giant);
107}
108
109static int
110g_disk_access(struct g_provider *pp, int r, int w, int e)
111{
112 struct disk *dp;
113 int error;
114
115 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
116 pp->name, r, w, e);
117 g_topology_assert();
118 dp = pp->geom->softc;
119 if (dp == NULL || dp->d_destroyed) {
120 /*
121 * Allow decreasing access count even if disk is not
122 * avaliable anymore.
123 */
124 if (r <= 0 && w <= 0 && e <= 0)
125 return (0);
126 return (ENXIO);
127 }
128 r += pp->acr;
129 w += pp->acw;
130 e += pp->ace;
131 error = 0;
132 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
133 if (dp->d_open != NULL) {
134 g_disk_lock_giant(dp);
135 error = dp->d_open(dp);
|
137 printf("Opened disk %s -> %d\n",
138 pp->name, error);
139 g_disk_unlock_giant(dp);
140 }
141 pp->mediasize = dp->d_mediasize;
142 pp->sectorsize = dp->d_sectorsize;
143 dp->d_flags |= DISKFLAG_OPEN;
144 if (dp->d_maxsize == 0) {
145 printf("WARNING: Disk drive %s%d has no d_maxsize\n",
146 dp->d_name, dp->d_unit);
147 dp->d_maxsize = DFLTPHYS;
148 }
149 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
150 if (dp->d_close != NULL) {
151 g_disk_lock_giant(dp);
152 error = dp->d_close(dp);
153 if (error != 0)
154 printf("Closed disk %s -> %d\n",
155 pp->name, error);
156 g_disk_unlock_giant(dp);
157 }
158 dp->d_flags &= ~DISKFLAG_OPEN;
159 }
160 return (error);
161}
162
163static void
164g_disk_kerneldump(struct bio *bp, struct disk *dp)
165{
166 int error;
167 struct g_kerneldump *gkd;
168 struct dumperinfo di;
169 struct g_geom *gp;
170
171 gkd = (struct g_kerneldump*)bp->bio_data;
172 gp = bp->bio_to->geom;
173 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
174 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
175 if (dp->d_dump == NULL) {
176 g_io_deliver(bp, ENODEV);
177 return;
178 }
179 di.dumper = dp->d_dump;
180 di.priv = dp;
181 di.blocksize = dp->d_sectorsize;
182 di.mediaoffset = gkd->offset;
183 if ((gkd->offset + gkd->length) > dp->d_mediasize)
184 gkd->length = dp->d_mediasize - gkd->offset;
185 di.mediasize = gkd->length;
186 error = set_dumper(&di);
187 g_io_deliver(bp, error);
188}
189
190static void
191g_disk_done(struct bio *bp)
192{
193 struct bio *bp2;
194 struct disk *dp;
195
196 /* See "notes" for why we need a mutex here */
197 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
198 mtx_lock(&g_disk_done_mtx);
199 bp->bio_completed = bp->bio_length - bp->bio_resid;
200
201 bp2 = bp->bio_parent;
202 if (bp2->bio_error == 0)
203 bp2->bio_error = bp->bio_error;
204 bp2->bio_completed += bp->bio_completed;
205 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) &&
206 (dp = bp2->bio_to->geom->softc)) {
207 devstat_end_transaction_bio(dp->d_devstat, bp);
208 }
209 g_destroy_bio(bp);
210 bp2->bio_inbed++;
211 if (bp2->bio_children == bp2->bio_inbed) {
212 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
213 g_io_deliver(bp2, bp2->bio_error);
214 }
215 mtx_unlock(&g_disk_done_mtx);
216}
217
218static int
219g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
220{
221 struct g_geom *gp;
222 struct disk *dp;
223 int error;
224
225 gp = pp->geom;
226 dp = gp->softc;
227
228 if (dp->d_ioctl == NULL)
229 return (ENOIOCTL);
230 g_disk_lock_giant(dp);
231 error = dp->d_ioctl(dp, cmd, data, fflag, td);
232 g_disk_unlock_giant(dp);
233 return(error);
234}
235
236static void
237g_disk_start(struct bio *bp)
238{
239 struct bio *bp2, *bp3;
240 struct disk *dp;
241 int error;
242 off_t off;
243
244 dp = bp->bio_to->geom->softc;
245 if (dp == NULL || dp->d_destroyed) {
246 g_io_deliver(bp, ENXIO);
247 return;
248 }
249 error = EJUSTRETURN;
250 switch(bp->bio_cmd) {
251 case BIO_DELETE:
252 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
253 error = 0;
254 break;
255 }
256 /* fall-through */
257 case BIO_READ:
258 case BIO_WRITE:
259 off = 0;
260 bp3 = NULL;
261 bp2 = g_clone_bio(bp);
262 if (bp2 == NULL) {
263 error = ENOMEM;
264 break;
265 }
266 do {
267 bp2->bio_offset += off;
268 bp2->bio_length -= off;
269 bp2->bio_data += off;
270 if (bp2->bio_length > dp->d_maxsize) {
271 /*
272 * XXX: If we have a stripesize we should really
273 * use it here.
274 */
275 bp2->bio_length = dp->d_maxsize;
276 off += dp->d_maxsize;
277 /*
278 * To avoid a race, we need to grab the next bio
279 * before we schedule this one. See "notes".
280 */
281 bp3 = g_clone_bio(bp);
282 if (bp3 == NULL)
283 bp->bio_error = ENOMEM;
284 }
285 bp2->bio_done = g_disk_done;
286 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
287 bp2->bio_bcount = bp2->bio_length;
288 bp2->bio_disk = dp;
289 devstat_start_transaction_bio(dp->d_devstat, bp2);
290 g_disk_lock_giant(dp);
291 dp->d_strategy(bp2);
292 g_disk_unlock_giant(dp);
293 bp2 = bp3;
294 bp3 = NULL;
295 } while (bp2 != NULL);
296 break;
297 case BIO_GETATTR:
298 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
299 break;
300 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
301 break;
302 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
303 break;
304 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
305 g_disk_kerneldump(bp, dp);
306 else
307 error = ENOIOCTL;
308 break;
309 case BIO_FLUSH:
310 g_trace(G_T_TOPOLOGY, "g_disk_flushcache(%s)",
311 bp->bio_to->name);
312 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
313 g_io_deliver(bp, ENODEV);
314 return;
315 }
316 bp2 = g_clone_bio(bp);
317 if (bp2 == NULL) {
318 g_io_deliver(bp, ENOMEM);
319 return;
320 }
321 bp2->bio_done = g_disk_done;
322 bp2->bio_disk = dp;
323 g_disk_lock_giant(dp);
324 dp->d_strategy(bp2);
325 g_disk_unlock_giant(dp);
326 break;
327 default:
328 error = EOPNOTSUPP;
329 break;
330 }
331 if (error != EJUSTRETURN)
332 g_io_deliver(bp, error);
333 return;
334}
335
336static void
337g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
338{
339 struct disk *dp;
340
341 dp = gp->softc;
342 if (dp == NULL)
343 return;
344 if (indent == NULL) {
345 sbuf_printf(sb, " hd %u", dp->d_fwheads);
346 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
347 return;
348 }
349 if (pp != NULL) {
350 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
351 indent, dp->d_fwheads);
352 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
353 indent, dp->d_fwsectors);
354 }
355}
356
357static void
358g_disk_create(void *arg, int flag)
359{
360 struct g_geom *gp;
361 struct g_provider *pp;
362 struct disk *dp;
363
364 if (flag == EV_CANCEL)
365 return;
366 g_topology_assert();
367 dp = arg;
368 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
369 gp->softc = dp;
370 pp = g_new_providerf(gp, "%s", gp->name);
371 pp->mediasize = dp->d_mediasize;
372 pp->sectorsize = dp->d_sectorsize;
373 if (dp->d_flags & DISKFLAG_CANDELETE)
374 pp->flags |= G_PF_CANDELETE;
375 pp->stripeoffset = dp->d_stripeoffset;
376 pp->stripesize = dp->d_stripesize;
377 if (bootverbose)
378 printf("GEOM: new disk %s\n", gp->name);
379 dp->d_geom = gp;
380 g_error_provider(pp, 0);
381}
382
383static void
384g_disk_destroy(void *ptr, int flag)
385{
386 struct disk *dp;
387 struct g_geom *gp;
388
389 g_topology_assert();
390 dp = ptr;
391 gp = dp->d_geom;
392 if (gp != NULL) {
393 gp->softc = NULL;
394 g_wither_geom(gp, ENXIO);
395 }
396 g_free(dp);
397}
398
399struct disk *
400disk_alloc()
401{
402 struct disk *dp;
403
404 dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO);
405 return (dp);
406}
407
408void
409disk_create(struct disk *dp, int version)
410{
411 if (version != DISK_VERSION_00) {
412 printf("WARNING: Attempt to add disk %s%d %s",
413 dp->d_name, dp->d_unit,
414 " using incompatible ABI version of disk(9)\n");
415 printf("WARNING: Ignoring disk %s%d\n",
416 dp->d_name, dp->d_unit);
417 return;
418 }
419 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
420 KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
421 KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
422 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
423 if (dp->d_devstat == NULL)
424 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
425 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
426 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
427 dp->d_geom = NULL;
428 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
429}
430
431void
432disk_destroy(struct disk *dp)
433{
434
435 g_cancel_event(dp);
436 dp->d_destroyed = 1;
437 if (dp->d_devstat != NULL)
438 devstat_remove_entry(dp->d_devstat);
439 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
440}
441
442void
443disk_gone(struct disk *dp)
444{
445 struct g_geom *gp;
446 struct g_provider *pp;
447
448 gp = dp->d_geom;
449 if (gp != NULL)
450 LIST_FOREACH(pp, &gp->provider, provider)
451 g_wither_provider(pp, ENXIO);
452}
453
454static void
455g_kern_disks(void *p, int flag __unused)
456{
457 struct sbuf *sb;
458 struct g_geom *gp;
459 char *sp;
460
461 sb = p;
462 sp = "";
463 g_topology_assert();
464 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
465 sbuf_printf(sb, "%s%s", sp, gp->name);
466 sp = " ";
467 }
468 sbuf_finish(sb);
469}
470
471static int
472sysctl_disks(SYSCTL_HANDLER_ARGS)
473{
474 int error;
475 struct sbuf *sb;
476
477 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
478 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
479 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
480 sbuf_delete(sb);
481 return error;
482}
483
484SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
485 sysctl_disks, "A", "names of available disks");
486
| 137 printf("Opened disk %s -> %d\n",
138 pp->name, error);
139 g_disk_unlock_giant(dp);
140 }
141 pp->mediasize = dp->d_mediasize;
142 pp->sectorsize = dp->d_sectorsize;
143 dp->d_flags |= DISKFLAG_OPEN;
144 if (dp->d_maxsize == 0) {
145 printf("WARNING: Disk drive %s%d has no d_maxsize\n",
146 dp->d_name, dp->d_unit);
147 dp->d_maxsize = DFLTPHYS;
148 }
149 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
150 if (dp->d_close != NULL) {
151 g_disk_lock_giant(dp);
152 error = dp->d_close(dp);
153 if (error != 0)
154 printf("Closed disk %s -> %d\n",
155 pp->name, error);
156 g_disk_unlock_giant(dp);
157 }
158 dp->d_flags &= ~DISKFLAG_OPEN;
159 }
160 return (error);
161}
162
163static void
164g_disk_kerneldump(struct bio *bp, struct disk *dp)
165{
166 int error;
167 struct g_kerneldump *gkd;
168 struct dumperinfo di;
169 struct g_geom *gp;
170
171 gkd = (struct g_kerneldump*)bp->bio_data;
172 gp = bp->bio_to->geom;
173 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
174 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
175 if (dp->d_dump == NULL) {
176 g_io_deliver(bp, ENODEV);
177 return;
178 }
179 di.dumper = dp->d_dump;
180 di.priv = dp;
181 di.blocksize = dp->d_sectorsize;
182 di.mediaoffset = gkd->offset;
183 if ((gkd->offset + gkd->length) > dp->d_mediasize)
184 gkd->length = dp->d_mediasize - gkd->offset;
185 di.mediasize = gkd->length;
186 error = set_dumper(&di);
187 g_io_deliver(bp, error);
188}
189
190static void
191g_disk_done(struct bio *bp)
192{
193 struct bio *bp2;
194 struct disk *dp;
195
196 /* See "notes" for why we need a mutex here */
197 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
198 mtx_lock(&g_disk_done_mtx);
199 bp->bio_completed = bp->bio_length - bp->bio_resid;
200
201 bp2 = bp->bio_parent;
202 if (bp2->bio_error == 0)
203 bp2->bio_error = bp->bio_error;
204 bp2->bio_completed += bp->bio_completed;
205 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) &&
206 (dp = bp2->bio_to->geom->softc)) {
207 devstat_end_transaction_bio(dp->d_devstat, bp);
208 }
209 g_destroy_bio(bp);
210 bp2->bio_inbed++;
211 if (bp2->bio_children == bp2->bio_inbed) {
212 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
213 g_io_deliver(bp2, bp2->bio_error);
214 }
215 mtx_unlock(&g_disk_done_mtx);
216}
217
218static int
219g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
220{
221 struct g_geom *gp;
222 struct disk *dp;
223 int error;
224
225 gp = pp->geom;
226 dp = gp->softc;
227
228 if (dp->d_ioctl == NULL)
229 return (ENOIOCTL);
230 g_disk_lock_giant(dp);
231 error = dp->d_ioctl(dp, cmd, data, fflag, td);
232 g_disk_unlock_giant(dp);
233 return(error);
234}
235
236static void
237g_disk_start(struct bio *bp)
238{
239 struct bio *bp2, *bp3;
240 struct disk *dp;
241 int error;
242 off_t off;
243
244 dp = bp->bio_to->geom->softc;
245 if (dp == NULL || dp->d_destroyed) {
246 g_io_deliver(bp, ENXIO);
247 return;
248 }
249 error = EJUSTRETURN;
250 switch(bp->bio_cmd) {
251 case BIO_DELETE:
252 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
253 error = 0;
254 break;
255 }
256 /* fall-through */
257 case BIO_READ:
258 case BIO_WRITE:
259 off = 0;
260 bp3 = NULL;
261 bp2 = g_clone_bio(bp);
262 if (bp2 == NULL) {
263 error = ENOMEM;
264 break;
265 }
266 do {
267 bp2->bio_offset += off;
268 bp2->bio_length -= off;
269 bp2->bio_data += off;
270 if (bp2->bio_length > dp->d_maxsize) {
271 /*
272 * XXX: If we have a stripesize we should really
273 * use it here.
274 */
275 bp2->bio_length = dp->d_maxsize;
276 off += dp->d_maxsize;
277 /*
278 * To avoid a race, we need to grab the next bio
279 * before we schedule this one. See "notes".
280 */
281 bp3 = g_clone_bio(bp);
282 if (bp3 == NULL)
283 bp->bio_error = ENOMEM;
284 }
285 bp2->bio_done = g_disk_done;
286 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
287 bp2->bio_bcount = bp2->bio_length;
288 bp2->bio_disk = dp;
289 devstat_start_transaction_bio(dp->d_devstat, bp2);
290 g_disk_lock_giant(dp);
291 dp->d_strategy(bp2);
292 g_disk_unlock_giant(dp);
293 bp2 = bp3;
294 bp3 = NULL;
295 } while (bp2 != NULL);
296 break;
297 case BIO_GETATTR:
298 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
299 break;
300 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
301 break;
302 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
303 break;
304 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
305 g_disk_kerneldump(bp, dp);
306 else
307 error = ENOIOCTL;
308 break;
309 case BIO_FLUSH:
310 g_trace(G_T_TOPOLOGY, "g_disk_flushcache(%s)",
311 bp->bio_to->name);
312 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
313 g_io_deliver(bp, ENODEV);
314 return;
315 }
316 bp2 = g_clone_bio(bp);
317 if (bp2 == NULL) {
318 g_io_deliver(bp, ENOMEM);
319 return;
320 }
321 bp2->bio_done = g_disk_done;
322 bp2->bio_disk = dp;
323 g_disk_lock_giant(dp);
324 dp->d_strategy(bp2);
325 g_disk_unlock_giant(dp);
326 break;
327 default:
328 error = EOPNOTSUPP;
329 break;
330 }
331 if (error != EJUSTRETURN)
332 g_io_deliver(bp, error);
333 return;
334}
335
336static void
337g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
338{
339 struct disk *dp;
340
341 dp = gp->softc;
342 if (dp == NULL)
343 return;
344 if (indent == NULL) {
345 sbuf_printf(sb, " hd %u", dp->d_fwheads);
346 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
347 return;
348 }
349 if (pp != NULL) {
350 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
351 indent, dp->d_fwheads);
352 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
353 indent, dp->d_fwsectors);
354 }
355}
356
357static void
358g_disk_create(void *arg, int flag)
359{
360 struct g_geom *gp;
361 struct g_provider *pp;
362 struct disk *dp;
363
364 if (flag == EV_CANCEL)
365 return;
366 g_topology_assert();
367 dp = arg;
368 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
369 gp->softc = dp;
370 pp = g_new_providerf(gp, "%s", gp->name);
371 pp->mediasize = dp->d_mediasize;
372 pp->sectorsize = dp->d_sectorsize;
373 if (dp->d_flags & DISKFLAG_CANDELETE)
374 pp->flags |= G_PF_CANDELETE;
375 pp->stripeoffset = dp->d_stripeoffset;
376 pp->stripesize = dp->d_stripesize;
377 if (bootverbose)
378 printf("GEOM: new disk %s\n", gp->name);
379 dp->d_geom = gp;
380 g_error_provider(pp, 0);
381}
382
383static void
384g_disk_destroy(void *ptr, int flag)
385{
386 struct disk *dp;
387 struct g_geom *gp;
388
389 g_topology_assert();
390 dp = ptr;
391 gp = dp->d_geom;
392 if (gp != NULL) {
393 gp->softc = NULL;
394 g_wither_geom(gp, ENXIO);
395 }
396 g_free(dp);
397}
398
399struct disk *
400disk_alloc()
401{
402 struct disk *dp;
403
404 dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO);
405 return (dp);
406}
407
408void
409disk_create(struct disk *dp, int version)
410{
411 if (version != DISK_VERSION_00) {
412 printf("WARNING: Attempt to add disk %s%d %s",
413 dp->d_name, dp->d_unit,
414 " using incompatible ABI version of disk(9)\n");
415 printf("WARNING: Ignoring disk %s%d\n",
416 dp->d_name, dp->d_unit);
417 return;
418 }
419 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
420 KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
421 KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
422 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
423 if (dp->d_devstat == NULL)
424 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
425 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
426 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
427 dp->d_geom = NULL;
428 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
429}
430
431void
432disk_destroy(struct disk *dp)
433{
434
435 g_cancel_event(dp);
436 dp->d_destroyed = 1;
437 if (dp->d_devstat != NULL)
438 devstat_remove_entry(dp->d_devstat);
439 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
440}
441
442void
443disk_gone(struct disk *dp)
444{
445 struct g_geom *gp;
446 struct g_provider *pp;
447
448 gp = dp->d_geom;
449 if (gp != NULL)
450 LIST_FOREACH(pp, &gp->provider, provider)
451 g_wither_provider(pp, ENXIO);
452}
453
454static void
455g_kern_disks(void *p, int flag __unused)
456{
457 struct sbuf *sb;
458 struct g_geom *gp;
459 char *sp;
460
461 sb = p;
462 sp = "";
463 g_topology_assert();
464 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
465 sbuf_printf(sb, "%s%s", sp, gp->name);
466 sp = " ";
467 }
468 sbuf_finish(sb);
469}
470
471static int
472sysctl_disks(SYSCTL_HANDLER_ARGS)
473{
474 int error;
475 struct sbuf *sb;
476
477 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
478 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
479 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
480 sbuf_delete(sb);
481 return error;
482}
483
484SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
485 sysctl_disks, "A", "names of available disks");
486
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