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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: releng/9.0/sys/geom/geom_disk.c 223921 2011-07-11 05:22:31Z ae $");
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/ctype.h>
47 #include <sys/fcntl.h>
48 #include <sys/malloc.h>
49 #include <sys/sbuf.h>
50 #include <sys/sysctl.h>
51 #include <sys/devicestat.h>
52 #include <machine/md_var.h>
53
54 #include <sys/lock.h>
55 #include <sys/mutex.h>
56 #include <geom/geom.h>
57 #include <geom/geom_disk.h>
58 #include <geom/geom_int.h>
59
60 #include <dev/led/led.h>
61
62 struct g_disk_softc {
63 struct disk *dp;
64 struct sysctl_ctx_list sysctl_ctx;
65 struct sysctl_oid *sysctl_tree;
66 char led[64];
67 uint32_t state;
68 };
69
70 static struct mtx g_disk_done_mtx;
71
72 static g_access_t g_disk_access;
73 static g_init_t g_disk_init;
74 static g_fini_t g_disk_fini;
75 static g_start_t g_disk_start;
76 static g_ioctl_t g_disk_ioctl;
77 static g_dumpconf_t g_disk_dumpconf;
78
79 static struct g_class g_disk_class = {
80 .name = "DISK",
81 .version = G_VERSION,
82 .init = g_disk_init,
83 .fini = g_disk_fini,
84 .start = g_disk_start,
85 .access = g_disk_access,
86 .ioctl = g_disk_ioctl,
87 .dumpconf = g_disk_dumpconf,
88 };
89
90 SYSCTL_DECL(_kern_geom);
91 SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, "GEOM_DISK stuff");
92
93 static void
94 g_disk_init(struct g_class *mp __unused)
95 {
96
97 mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
98 }
99
100 static void
101 g_disk_fini(struct g_class *mp __unused)
102 {
103
104 mtx_destroy(&g_disk_done_mtx);
105 }
106
107 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
108
109 static void __inline
110 g_disk_lock_giant(struct disk *dp)
111 {
112 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
113 mtx_lock(&Giant);
114 }
115
116 static void __inline
117 g_disk_unlock_giant(struct disk *dp)
118 {
119 if (dp->d_flags & DISKFLAG_NEEDSGIANT)
120 mtx_unlock(&Giant);
121 }
122
123 static int
124 g_disk_access(struct g_provider *pp, int r, int w, int e)
125 {
126 struct disk *dp;
127 struct g_disk_softc *sc;
128 int error;
129
130 g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
131 pp->name, r, w, e);
132 g_topology_assert();
133 sc = pp->geom->softc;
134 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
135 /*
136 * Allow decreasing access count even if disk is not
137 * avaliable anymore.
138 */
139 if (r <= 0 && w <= 0 && e <= 0)
140 return (0);
141 return (ENXIO);
142 }
143 r += pp->acr;
144 w += pp->acw;
145 e += pp->ace;
146 error = 0;
147 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
148 if (dp->d_open != NULL) {
149 g_disk_lock_giant(dp);
150 error = dp->d_open(dp);
151 if (bootverbose && error != 0)
152 printf("Opened disk %s -> %d\n",
153 pp->name, error);
154 g_disk_unlock_giant(dp);
155 }
156 pp->mediasize = dp->d_mediasize;
157 pp->sectorsize = dp->d_sectorsize;
158 if (dp->d_flags & DISKFLAG_CANDELETE)
159 pp->flags |= G_PF_CANDELETE;
160 else
161 pp->flags &= ~G_PF_CANDELETE;
162 pp->stripeoffset = dp->d_stripeoffset;
163 pp->stripesize = dp->d_stripesize;
164 dp->d_flags |= DISKFLAG_OPEN;
165 if (dp->d_maxsize == 0) {
166 printf("WARNING: Disk drive %s%d has no d_maxsize\n",
167 dp->d_name, dp->d_unit);
168 dp->d_maxsize = DFLTPHYS;
169 }
170 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
171 if (dp->d_close != NULL) {
172 g_disk_lock_giant(dp);
173 error = dp->d_close(dp);
174 if (error != 0)
175 printf("Closed disk %s -> %d\n",
176 pp->name, error);
177 g_disk_unlock_giant(dp);
178 }
179 sc->state = G_STATE_ACTIVE;
180 if (sc->led[0] != 0)
181 led_set(sc->led, "");
182 dp->d_flags &= ~DISKFLAG_OPEN;
183 }
184 return (error);
185 }
186
187 static void
188 g_disk_kerneldump(struct bio *bp, struct disk *dp)
189 {
190 struct g_kerneldump *gkd;
191 struct g_geom *gp;
192
193 gkd = (struct g_kerneldump*)bp->bio_data;
194 gp = bp->bio_to->geom;
195 g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
196 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
197 if (dp->d_dump == NULL) {
198 g_io_deliver(bp, ENODEV);
199 return;
200 }
201 gkd->di.dumper = dp->d_dump;
202 gkd->di.priv = dp;
203 gkd->di.blocksize = dp->d_sectorsize;
204 gkd->di.maxiosize = dp->d_maxsize;
205 gkd->di.mediaoffset = gkd->offset;
206 if ((gkd->offset + gkd->length) > dp->d_mediasize)
207 gkd->length = dp->d_mediasize - gkd->offset;
208 gkd->di.mediasize = gkd->length;
209 g_io_deliver(bp, 0);
210 }
211
212 static void
213 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
214 {
215 const char *cmd;
216
217 memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
218 if (sc->led[0] != 0) {
219 switch (sc->state) {
220 case G_STATE_FAILED:
221 cmd = "1";
222 break;
223 case G_STATE_REBUILD:
224 cmd = "f5";
225 break;
226 case G_STATE_RESYNC:
227 cmd = "f1";
228 break;
229 default:
230 cmd = "";
231 break;
232 }
233 led_set(sc->led, cmd);
234 }
235 g_io_deliver(bp, 0);
236 }
237
238 static void
239 g_disk_done(struct bio *bp)
240 {
241 struct bio *bp2;
242 struct disk *dp;
243 struct g_disk_softc *sc;
244
245 /* See "notes" for why we need a mutex here */
246 /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
247 mtx_lock(&g_disk_done_mtx);
248 bp->bio_completed = bp->bio_length - bp->bio_resid;
249
250 bp2 = bp->bio_parent;
251 if (bp2->bio_error == 0)
252 bp2->bio_error = bp->bio_error;
253 bp2->bio_completed += bp->bio_completed;
254 if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) &&
255 (sc = bp2->bio_to->geom->softc) &&
256 (dp = sc->dp)) {
257 devstat_end_transaction_bio(dp->d_devstat, bp);
258 }
259 g_destroy_bio(bp);
260 bp2->bio_inbed++;
261 if (bp2->bio_children == bp2->bio_inbed) {
262 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
263 g_io_deliver(bp2, bp2->bio_error);
264 }
265 mtx_unlock(&g_disk_done_mtx);
266 }
267
268 static int
269 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
270 {
271 struct g_geom *gp;
272 struct disk *dp;
273 struct g_disk_softc *sc;
274 int error;
275
276 gp = pp->geom;
277 sc = gp->softc;
278 dp = sc->dp;
279
280 if (dp->d_ioctl == NULL)
281 return (ENOIOCTL);
282 g_disk_lock_giant(dp);
283 error = dp->d_ioctl(dp, cmd, data, fflag, td);
284 g_disk_unlock_giant(dp);
285 return(error);
286 }
287
288 static void
289 g_disk_start(struct bio *bp)
290 {
291 struct bio *bp2, *bp3;
292 struct disk *dp;
293 struct g_disk_softc *sc;
294 int error;
295 off_t off;
296
297 sc = bp->bio_to->geom->softc;
298 if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
299 g_io_deliver(bp, ENXIO);
300 return;
301 }
302 error = EJUSTRETURN;
303 switch(bp->bio_cmd) {
304 case BIO_DELETE:
305 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
306 error = 0;
307 break;
308 }
309 /* fall-through */
310 case BIO_READ:
311 case BIO_WRITE:
312 off = 0;
313 bp3 = NULL;
314 bp2 = g_clone_bio(bp);
315 if (bp2 == NULL) {
316 error = ENOMEM;
317 break;
318 }
319 do {
320 bp2->bio_offset += off;
321 bp2->bio_length -= off;
322 bp2->bio_data += off;
323 if (bp2->bio_length > dp->d_maxsize) {
324 /*
325 * XXX: If we have a stripesize we should really
326 * use it here.
327 */
328 bp2->bio_length = dp->d_maxsize;
329 off += dp->d_maxsize;
330 /*
331 * To avoid a race, we need to grab the next bio
332 * before we schedule this one. See "notes".
333 */
334 bp3 = g_clone_bio(bp);
335 if (bp3 == NULL)
336 bp->bio_error = ENOMEM;
337 }
338 bp2->bio_done = g_disk_done;
339 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
340 bp2->bio_bcount = bp2->bio_length;
341 bp2->bio_disk = dp;
342 devstat_start_transaction_bio(dp->d_devstat, bp2);
343 g_disk_lock_giant(dp);
344 dp->d_strategy(bp2);
345 g_disk_unlock_giant(dp);
346 bp2 = bp3;
347 bp3 = NULL;
348 } while (bp2 != NULL);
349 break;
350 case BIO_GETATTR:
351 /* Give the driver a chance to override */
352 if (dp->d_getattr != NULL) {
353 if (bp->bio_disk == NULL)
354 bp->bio_disk = dp;
355 error = dp->d_getattr(bp);
356 if (error != -1)
357 break;
358 error = EJUSTRETURN;
359 }
360 if (g_handleattr_int(bp, "GEOM::candelete",
361 (dp->d_flags & DISKFLAG_CANDELETE) != 0))
362 break;
363 else if (g_handleattr_int(bp, "GEOM::fwsectors",
364 dp->d_fwsectors))
365 break;
366 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
367 break;
368 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
369 break;
370 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
371 break;
372 else if (g_handleattr(bp, "GEOM::hba_vendor",
373 &dp->d_hba_vendor, 2))
374 break;
375 else if (g_handleattr(bp, "GEOM::hba_device",
376 &dp->d_hba_device, 2))
377 break;
378 else if (g_handleattr(bp, "GEOM::hba_subvendor",
379 &dp->d_hba_subvendor, 2))
380 break;
381 else if (g_handleattr(bp, "GEOM::hba_subdevice",
382 &dp->d_hba_subdevice, 2))
383 break;
384 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
385 g_disk_kerneldump(bp, dp);
386 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
387 g_disk_setstate(bp, sc);
388 else
389 error = ENOIOCTL;
390 break;
391 case BIO_FLUSH:
392 g_trace(G_T_TOPOLOGY, "g_disk_flushcache(%s)",
393 bp->bio_to->name);
394 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
395 g_io_deliver(bp, ENODEV);
396 return;
397 }
398 bp2 = g_clone_bio(bp);
399 if (bp2 == NULL) {
400 g_io_deliver(bp, ENOMEM);
401 return;
402 }
403 bp2->bio_done = g_disk_done;
404 bp2->bio_disk = dp;
405 g_disk_lock_giant(dp);
406 dp->d_strategy(bp2);
407 g_disk_unlock_giant(dp);
408 break;
409 default:
410 error = EOPNOTSUPP;
411 break;
412 }
413 if (error != EJUSTRETURN)
414 g_io_deliver(bp, error);
415 return;
416 }
417
418 static void
419 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
420 {
421 struct disk *dp;
422 struct g_disk_softc *sc;
423
424 sc = gp->softc;
425 if (sc == NULL || (dp = sc->dp) == NULL)
426 return;
427 if (indent == NULL) {
428 sbuf_printf(sb, " hd %u", dp->d_fwheads);
429 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
430 return;
431 }
432 if (pp != NULL) {
433 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
434 indent, dp->d_fwheads);
435 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
436 indent, dp->d_fwsectors);
437 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident);
438 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
439 }
440 }
441
442 static void
443 g_disk_create(void *arg, int flag)
444 {
445 struct g_geom *gp;
446 struct g_provider *pp;
447 struct disk *dp;
448 struct g_disk_softc *sc;
449 char tmpstr[80];
450
451 if (flag == EV_CANCEL)
452 return;
453 g_topology_assert();
454 dp = arg;
455 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
456 sc->dp = dp;
457 gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
458 gp->softc = sc;
459 pp = g_new_providerf(gp, "%s", gp->name);
460 pp->mediasize = dp->d_mediasize;
461 pp->sectorsize = dp->d_sectorsize;
462 if (dp->d_flags & DISKFLAG_CANDELETE)
463 pp->flags |= G_PF_CANDELETE;
464 pp->stripeoffset = dp->d_stripeoffset;
465 pp->stripesize = dp->d_stripesize;
466 if (bootverbose)
467 printf("GEOM: new disk %s\n", gp->name);
468 sysctl_ctx_init(&sc->sysctl_ctx);
469 snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
470 sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
471 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
472 CTLFLAG_RD, 0, tmpstr);
473 if (sc->sysctl_tree != NULL) {
474 snprintf(tmpstr, sizeof(tmpstr),
475 "kern.geom.disk.%s.led", gp->name);
476 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
477 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
478 SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
479 CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
480 "LED name");
481 }
482 pp->private = sc;
483 dp->d_geom = gp;
484 g_error_provider(pp, 0);
485 }
486
487 static void
488 g_disk_destroy(void *ptr, int flag)
489 {
490 struct disk *dp;
491 struct g_geom *gp;
492 struct g_disk_softc *sc;
493
494 g_topology_assert();
495 dp = ptr;
496 gp = dp->d_geom;
497 if (gp != NULL) {
498 sc = gp->softc;
499 if (sc->sysctl_tree != NULL) {
500 sysctl_ctx_free(&sc->sysctl_ctx);
501 sc->sysctl_tree = NULL;
502 }
503 if (sc->led[0] != 0) {
504 led_set(sc->led, "");
505 sc->led[0] = 0;
506 }
507 g_free(sc);
508 gp->softc = NULL;
509 g_wither_geom(gp, ENXIO);
510 }
511 g_free(dp);
512 }
513
514 /*
515 * We only allow printable characters in disk ident,
516 * the rest is converted to 'x<HH>'.
517 */
518 static void
519 g_disk_ident_adjust(char *ident, size_t size)
520 {
521 char *p, tmp[4], newid[DISK_IDENT_SIZE];
522
523 newid[0] = '\0';
524 for (p = ident; *p != '\0'; p++) {
525 if (isprint(*p)) {
526 tmp[0] = *p;
527 tmp[1] = '\0';
528 } else {
529 snprintf(tmp, sizeof(tmp), "x%02hhx",
530 *(unsigned char *)p);
531 }
532 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
533 break;
534 }
535 bzero(ident, size);
536 strlcpy(ident, newid, size);
537 }
538
539 struct disk *
540 disk_alloc()
541 {
542 struct disk *dp;
543
544 dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO);
545 return (dp);
546 }
547
548 void
549 disk_create(struct disk *dp, int version)
550 {
551 if (version != DISK_VERSION_00 && version != DISK_VERSION_01) {
552 printf("WARNING: Attempt to add disk %s%d %s",
553 dp->d_name, dp->d_unit,
554 " using incompatible ABI version of disk(9)\n");
555 printf("WARNING: Ignoring disk %s%d\n",
556 dp->d_name, dp->d_unit);
557 return;
558 }
559 KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
560 KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
561 KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
562 KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
563 if (dp->d_devstat == NULL)
564 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
565 dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
566 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
567 dp->d_geom = NULL;
568 g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
569 g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
570 }
571
572 void
573 disk_destroy(struct disk *dp)
574 {
575
576 g_cancel_event(dp);
577 dp->d_destroyed = 1;
578 if (dp->d_devstat != NULL)
579 devstat_remove_entry(dp->d_devstat);
580 g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
581 }
582
583 void
584 disk_gone(struct disk *dp)
585 {
586 struct g_geom *gp;
587 struct g_provider *pp;
588
589 gp = dp->d_geom;
590 if (gp != NULL)
591 LIST_FOREACH(pp, &gp->provider, provider)
592 g_wither_provider(pp, ENXIO);
593 }
594
595 void
596 disk_attr_changed(struct disk *dp, const char *attr, int flag)
597 {
598 struct g_geom *gp;
599 struct g_provider *pp;
600
601 gp = dp->d_geom;
602 if (gp != NULL)
603 LIST_FOREACH(pp, &gp->provider, provider)
604 (void)g_attr_changed(pp, attr, flag);
605 }
606
607 static void
608 g_kern_disks(void *p, int flag __unused)
609 {
610 struct sbuf *sb;
611 struct g_geom *gp;
612 char *sp;
613
614 sb = p;
615 sp = "";
616 g_topology_assert();
617 LIST_FOREACH(gp, &g_disk_class.geom, geom) {
618 sbuf_printf(sb, "%s%s", sp, gp->name);
619 sp = " ";
620 }
621 sbuf_finish(sb);
622 }
623
624 static int
625 sysctl_disks(SYSCTL_HANDLER_ARGS)
626 {
627 int error;
628 struct sbuf *sb;
629
630 sb = sbuf_new_auto();
631 g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
632 error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
633 sbuf_delete(sb);
634 return error;
635 }
636
637 SYSCTL_PROC(_kern, OID_AUTO, disks,
638 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
639 sysctl_disks, "A", "names of available disks");
640
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