2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
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.
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.
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
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
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/devicestat.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/sysctl.h>
49 #include <sys/kthread.h>
51 #include <sys/mutex.h>
52 #include <sys/errno.h>
54 #include <geom/geom.h>
55 #include <geom/geom_int.h>
56 #include <machine/stdarg.h>
66 struct class_list_head g_classes = LIST_HEAD_INITIALIZER(g_classes);
67 static struct g_tailq_head geoms = TAILQ_HEAD_INITIALIZER(geoms);
68 char *g_wait_event, *g_wait_up, *g_wait_down, *g_wait_sim;
72 struct g_provider *pp;
79 * This event offers a new class a chance to taste all preexisting providers.
82 g_load_class(void *arg, int flag)
85 struct g_class *mp2, *mp;
87 struct g_provider *pp;
90 if (flag == EV_CANCEL) /* XXX: can't happen ? */
102 g_trace(G_T_TOPOLOGY, "g_load_class(%s)", mp->name);
103 KASSERT(mp->name != NULL && *mp->name != '\0',
104 ("GEOM class has no name"));
105 LIST_FOREACH(mp2, &g_classes, class) {
107 printf("The GEOM class %s is already loaded.\n",
112 } else if (strcmp(mp2->name, mp->name) == 0) {
113 printf("A GEOM class %s is already loaded.\n",
121 LIST_INIT(&mp->geom);
122 LIST_INSERT_HEAD(&g_classes, mp, class);
123 if (mp->init != NULL)
125 if (mp->taste == NULL)
127 LIST_FOREACH(mp2, &g_classes, class) {
130 LIST_FOREACH(gp, &mp2->geom, geom) {
131 LIST_FOREACH(pp, &gp->provider, provider) {
132 mp->taste(mp, pp, 0);
140 g_unload_class(struct g_class *mp)
143 struct g_provider *pp;
144 struct g_consumer *cp;
148 g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name);
151 LIST_FOREACH(gp, &mp->geom, geom) {
152 /* We refuse to unload if anything is open */
153 LIST_FOREACH(pp, &gp->provider, provider)
154 if (pp->acr || pp->acw || pp->ace) {
158 LIST_FOREACH(cp, &gp->consumer, consumer)
159 if (cp->acr || cp->acw || cp->ace) {
163 /* If the geom is withering, wait for it to finish. */
164 if (gp->flags & G_GEOM_WITHER) {
165 g_topology_sleep(mp, 1);
171 * We allow unloading if we have no geoms, or a class
172 * method we can use to get rid of them.
174 if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) {
179 /* Bar new entries */
183 LIST_FOREACH(gp, &mp->geom, geom) {
184 error = mp->destroy_geom(NULL, mp, gp);
190 /* Wait for withering to finish. */
192 gp = LIST_FIRST(&mp->geom);
195 KASSERT(gp->flags & G_GEOM_WITHER,
196 ("Non-withering geom in class %s", mp->name));
197 g_topology_sleep(mp, 1);
200 if (mp->fini != NULL)
202 LIST_REMOVE(mp, class);
209 g_modevent(module_t mod, int type, void *data)
213 static int g_ignition;
217 if (mp->version != G_VERSION) {
218 printf("GEOM class %s has Wrong version %x\n",
219 mp->name, mp->version);
229 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", mp->name);
230 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
233 * Once the system is not cold, MOD_LOAD calls will be
234 * from the userland and the g_event thread will be able
235 * to acknowledge their completion.
239 error = g_post_event(g_load_class, hh, M_WAITOK, NULL);
241 error = g_waitfor_event(g_load_class, hh, M_WAITOK,
249 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", mp->name);
251 error = g_unload_class(mp);
254 KASSERT(LIST_EMPTY(&mp->geom),
255 ("Unloaded class (%s) still has geom", mp->name));
263 g_retaste_event(void *arg, int flag)
265 struct g_class *mp, *mp2;
268 struct g_provider *pp;
269 struct g_consumer *cp;
272 if (flag == EV_CANCEL) /* XXX: can't happen ? */
274 if (g_shutdown || g_notaste)
284 g_trace(G_T_TOPOLOGY, "g_retaste(%s)", mp->name);
286 LIST_FOREACH(mp2, &g_classes, class) {
287 LIST_FOREACH(gp, &mp2->geom, geom) {
288 LIST_FOREACH(pp, &gp->provider, provider) {
289 if (pp->acr || pp->acw || pp->ace)
291 LIST_FOREACH(cp, &pp->consumers, consumers) {
292 if (cp->geom->class == mp &&
293 (cp->flags & G_CF_ORPHAN) == 0)
297 cp->flags |= G_CF_ORPHAN;
298 g_wither_geom(cp->geom, ENXIO);
300 mp->taste(mp, pp, 0);
308 g_retaste(struct g_class *mp)
313 if (mp->taste == NULL)
316 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
321 error = g_post_event(g_retaste_event, hh, M_WAITOK, NULL);
323 error = g_waitfor_event(g_retaste_event, hh, M_WAITOK, NULL);
333 g_new_geomf(struct g_class *mp, const char *fmt, ...)
341 sb = sbuf_new_auto();
343 sbuf_vprintf(sb, fmt, ap);
346 gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO);
347 gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
350 LIST_INIT(&gp->consumer);
351 LIST_INIT(&gp->provider);
352 LIST_INSERT_HEAD(&mp->geom, gp, geom);
353 TAILQ_INSERT_HEAD(&geoms, gp, geoms);
354 strcpy(gp->name, sbuf_data(sb));
356 /* Fill in defaults from class */
357 gp->start = mp->start;
358 gp->spoiled = mp->spoiled;
359 gp->attrchanged = mp->attrchanged;
360 gp->providergone = mp->providergone;
361 gp->dumpconf = mp->dumpconf;
362 gp->access = mp->access;
363 gp->orphan = mp->orphan;
364 gp->ioctl = mp->ioctl;
365 gp->resize = mp->resize;
370 g_destroy_geom(struct g_geom *gp)
375 g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name);
376 KASSERT(LIST_EMPTY(&gp->consumer),
377 ("g_destroy_geom(%s) with consumer(s) [%p]",
378 gp->name, LIST_FIRST(&gp->consumer)));
379 KASSERT(LIST_EMPTY(&gp->provider),
380 ("g_destroy_geom(%s) with provider(s) [%p]",
381 gp->name, LIST_FIRST(&gp->provider)));
383 LIST_REMOVE(gp, geom);
384 TAILQ_REMOVE(&geoms, gp, geoms);
390 * This function is called (repeatedly) until the geom has withered away.
393 g_wither_geom(struct g_geom *gp, int error)
395 struct g_provider *pp;
399 g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name);
400 if (!(gp->flags & G_GEOM_WITHER)) {
401 gp->flags |= G_GEOM_WITHER;
402 LIST_FOREACH(pp, &gp->provider, provider)
403 if (!(pp->flags & G_PF_ORPHAN))
404 g_orphan_provider(pp, error);
410 * Convenience function to destroy a particular provider.
413 g_wither_provider(struct g_provider *pp, int error)
416 pp->flags |= G_PF_WITHER;
417 if (!(pp->flags & G_PF_ORPHAN))
418 g_orphan_provider(pp, error);
422 * This function is called (repeatedly) until the has withered away.
425 g_wither_geom_close(struct g_geom *gp, int error)
427 struct g_consumer *cp;
431 g_trace(G_T_TOPOLOGY, "g_wither_geom_close(%p(%s))", gp, gp->name);
432 LIST_FOREACH(cp, &gp->consumer, consumer)
433 if (cp->acr || cp->acw || cp->ace)
434 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
435 g_wither_geom(gp, error);
439 * This function is called (repeatedly) until we cant wash away more
440 * withered bits at present.
446 struct g_geom *gp, *gp2;
447 struct g_provider *pp, *pp2;
448 struct g_consumer *cp, *cp2;
451 LIST_FOREACH(mp, &g_classes, class) {
452 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
453 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
454 if (!(pp->flags & G_PF_WITHER))
456 if (LIST_EMPTY(&pp->consumers))
457 g_destroy_provider(pp);
459 if (!(gp->flags & G_GEOM_WITHER))
461 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
462 if (LIST_EMPTY(&pp->consumers))
463 g_destroy_provider(pp);
465 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) {
466 if (cp->acr || cp->acw || cp->ace)
468 if (cp->provider != NULL)
470 g_destroy_consumer(cp);
472 if (LIST_EMPTY(&gp->provider) &&
473 LIST_EMPTY(&gp->consumer))
480 g_new_consumer(struct g_geom *gp)
482 struct g_consumer *cp;
486 KASSERT(!(gp->flags & G_GEOM_WITHER),
487 ("g_new_consumer on WITHERing geom(%s) (class %s)",
488 gp->name, gp->class->name));
489 KASSERT(gp->orphan != NULL,
490 ("g_new_consumer on geom(%s) (class %s) without orphan",
491 gp->name, gp->class->name));
493 cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO);
495 cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED,
496 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
497 LIST_INSERT_HEAD(&gp->consumer, cp, consumer);
502 g_destroy_consumer(struct g_consumer *cp)
507 G_VALID_CONSUMER(cp);
508 g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp);
509 KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached"));
510 KASSERT (cp->acr == 0, ("g_destroy_consumer with acr"));
511 KASSERT (cp->acw == 0, ("g_destroy_consumer with acw"));
512 KASSERT (cp->ace == 0, ("g_destroy_consumer with ace"));
515 LIST_REMOVE(cp, consumer);
516 devstat_remove_entry(cp->stat);
518 if (gp->flags & G_GEOM_WITHER)
523 g_new_provider_event(void *arg, int flag)
526 struct g_provider *pp;
527 struct g_consumer *cp, *next_cp;
530 if (flag == EV_CANCEL)
535 G_VALID_PROVIDER(pp);
536 KASSERT(!(pp->flags & G_PF_WITHER),
537 ("g_new_provider_event but withered"));
538 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, next_cp) {
539 if ((cp->flags & G_CF_ORPHAN) == 0 &&
540 cp->geom->attrchanged != NULL)
541 cp->geom->attrchanged(cp, "GEOM::media");
545 LIST_FOREACH(mp, &g_classes, class) {
546 if (mp->taste == NULL)
548 LIST_FOREACH(cp, &pp->consumers, consumers)
549 if (cp->geom->class == mp &&
550 (cp->flags & G_CF_ORPHAN) == 0)
554 mp->taste(mp, pp, 0);
561 g_new_providerf(struct g_geom *gp, const char *fmt, ...)
563 struct g_provider *pp;
569 KASSERT(gp->access != NULL,
570 ("new provider on geom(%s) without ->access (class %s)",
571 gp->name, gp->class->name));
572 KASSERT(gp->start != NULL,
573 ("new provider on geom(%s) without ->start (class %s)",
574 gp->name, gp->class->name));
575 KASSERT(!(gp->flags & G_GEOM_WITHER),
576 ("new provider on WITHERing geom(%s) (class %s)",
577 gp->name, gp->class->name));
578 sb = sbuf_new_auto();
580 sbuf_vprintf(sb, fmt, ap);
583 pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
584 pp->name = (char *)(pp + 1);
585 strcpy(pp->name, sbuf_data(sb));
587 LIST_INIT(&pp->consumers);
590 pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED,
591 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
592 LIST_INSERT_HEAD(&gp->provider, pp, provider);
593 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, gp, NULL);
598 g_error_provider(struct g_provider *pp, int error)
601 /* G_VALID_PROVIDER(pp); We may not have g_topology */
606 g_resize_provider_event(void *arg, int flag)
611 struct g_provider *pp;
612 struct g_consumer *cp, *cp2;
624 G_VALID_PROVIDER(pp);
625 g_trace(G_T_TOPOLOGY, "g_resize_provider_event(%p)", pp);
627 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) {
629 if (gp->resize == NULL && size < pp->mediasize) {
630 cp->flags |= G_CF_ORPHAN;
631 cp->geom->orphan(cp);
635 pp->mediasize = size;
637 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) {
639 if (gp->resize != NULL)
644 * After resizing, the previously invalid GEOM class metadata
645 * might become valid. This means we should retaste.
647 LIST_FOREACH(mp, &g_classes, class) {
648 if (mp->taste == NULL)
650 LIST_FOREACH(cp, &pp->consumers, consumers)
651 if (cp->geom->class == mp &&
652 (cp->flags & G_CF_ORPHAN) == 0)
656 mp->taste(mp, pp, 0);
662 g_resize_provider(struct g_provider *pp, off_t size)
666 G_VALID_PROVIDER(pp);
668 if (size == pp->mediasize)
671 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
674 g_post_event(g_resize_provider_event, hh, M_WAITOK, NULL);
678 #define _PATH_DEV "/dev/"
682 g_provider_by_name(char const *arg)
686 struct g_provider *pp, *wpp;
688 if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
689 arg += sizeof(_PATH_DEV) - 1;
692 LIST_FOREACH(cp, &g_classes, class) {
693 LIST_FOREACH(gp, &cp->geom, geom) {
694 LIST_FOREACH(pp, &gp->provider, provider) {
695 if (strcmp(arg, pp->name) != 0)
697 if ((gp->flags & G_GEOM_WITHER) == 0 &&
698 (pp->flags & G_PF_WITHER) == 0)
710 g_destroy_provider(struct g_provider *pp)
715 G_VALID_PROVIDER(pp);
716 KASSERT(LIST_EMPTY(&pp->consumers),
717 ("g_destroy_provider but attached"));
718 KASSERT (pp->acr == 0, ("g_destroy_provider with acr"));
719 KASSERT (pp->acw == 0, ("g_destroy_provider with acw"));
720 KASSERT (pp->ace == 0, ("g_destroy_provider with ace"));
722 LIST_REMOVE(pp, provider);
724 devstat_remove_entry(pp->stat);
726 * If a callback was provided, send notification that the provider
729 if (gp->providergone != NULL)
730 gp->providergone(pp);
733 if ((gp->flags & G_GEOM_WITHER))
738 * We keep the "geoms" list sorted by topological order (== increasing
739 * numerical rank) at all times.
740 * When an attach is done, the attaching geoms rank is invalidated
741 * and it is moved to the tail of the list.
742 * All geoms later in the sequence has their ranks reevaluated in
743 * sequence. If we cannot assign rank to a geom because it's
744 * prerequisites do not have rank, we move that element to the tail
745 * of the sequence with invalid rank as well.
746 * At some point we encounter our original geom and if we stil fail
747 * to assign it a rank, there must be a loop and we fail back to
748 * g_attach() which detach again and calls redo_rank again
749 * to fix up the damage.
750 * It would be much simpler code wise to do it recursively, but we
751 * can't risk that on the kernel stack.
755 redo_rank(struct g_geom *gp)
757 struct g_consumer *cp;
758 struct g_geom *gp1, *gp2;
764 /* Invalidate this geoms rank and move it to the tail */
765 gp1 = TAILQ_NEXT(gp, geoms);
768 TAILQ_REMOVE(&geoms, gp, geoms);
769 TAILQ_INSERT_TAIL(&geoms, gp, geoms);
774 /* re-rank the rest of the sequence */
775 for (; gp1 != NULL; gp1 = gp2) {
778 LIST_FOREACH(cp, &gp1->consumer, consumer) {
779 if (cp->provider == NULL)
781 n = cp->provider->geom->rank;
789 gp2 = TAILQ_NEXT(gp1, geoms);
791 /* got a rank, moving on */
795 /* no rank to original geom means loop */
799 /* no rank, put it at the end move on */
800 TAILQ_REMOVE(&geoms, gp1, geoms);
801 TAILQ_INSERT_TAIL(&geoms, gp1, geoms);
807 g_attach(struct g_consumer *cp, struct g_provider *pp)
812 G_VALID_CONSUMER(cp);
813 G_VALID_PROVIDER(pp);
814 g_trace(G_T_TOPOLOGY, "g_attach(%p, %p)", cp, pp);
815 KASSERT(cp->provider == NULL, ("attach but attached"));
817 LIST_INSERT_HEAD(&pp->consumers, cp, consumers);
818 error = redo_rank(cp->geom);
820 LIST_REMOVE(cp, consumers);
828 g_detach(struct g_consumer *cp)
830 struct g_provider *pp;
833 G_VALID_CONSUMER(cp);
834 g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp);
835 KASSERT(cp->provider != NULL, ("detach but not attached"));
836 KASSERT(cp->acr == 0, ("detach but nonzero acr"));
837 KASSERT(cp->acw == 0, ("detach but nonzero acw"));
838 KASSERT(cp->ace == 0, ("detach but nonzero ace"));
839 KASSERT(cp->nstart == cp->nend,
840 ("detach with active requests"));
842 LIST_REMOVE(cp, consumers);
844 if ((cp->geom->flags & G_GEOM_WITHER) ||
845 (pp->geom->flags & G_GEOM_WITHER) ||
846 (pp->flags & G_PF_WITHER))
854 * Access-check with delta values. The question asked is "can provider
855 * "cp" change the access counters by the relative amounts dc[rwe] ?"
859 g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
861 struct g_provider *pp;
870 G_VALID_CONSUMER(cp);
872 KASSERT(pp != NULL, ("access but not attached"));
873 G_VALID_PROVIDER(pp);
876 g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
877 cp, pp->name, dcr, dcw, dce);
879 KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr"));
880 KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw"));
881 KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace"));
882 KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request"));
883 KASSERT(gp->access != NULL, ("NULL geom->access"));
886 * If our class cares about being spoiled, and we have been, we
887 * are probably just ahead of the event telling us that. Fail
888 * now rather than having to unravel this later.
890 if (cp->geom->spoiled != NULL && (cp->flags & G_CF_SPOILED) &&
891 (dcr > 0 || dcw > 0 || dce > 0))
895 * A number of GEOM classes either need to perform an I/O on the first
896 * open or to acquire a different subsystem's lock. To do that they
897 * may have to drop the topology lock.
898 * Other GEOM classes perform special actions when opening a lower rank
899 * geom for the first time. As a result, more than one thread may
900 * end up performing the special actions.
901 * So, we prevent concurrent "first" opens by marking the consumer with
904 * Note that if the geom's access method never drops the topology lock,
905 * then we will never see G_GEOM_IN_ACCESS here.
907 while ((gp->flags & G_GEOM_IN_ACCESS) != 0) {
909 "%s: race on geom %s via provider %s and consumer of %s",
910 __func__, gp->name, pp->name, cp->geom->name);
911 gp->flags |= G_GEOM_ACCESS_WAIT;
912 g_topology_sleep(gp, 0);
916 * Figure out what counts the provider would have had, if this
917 * consumer had (r0w0e0) at this time.
919 pw = pp->acw - cp->acw;
920 pe = pp->ace - cp->ace;
923 "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)",
925 cp->acr, cp->acw, cp->ace,
926 pp->acr, pp->acw, pp->ace,
929 /* If foot-shooting is enabled, any open on rank#1 is OK */
930 if ((g_debugflags & 16) && gp->rank == 1)
932 /* If we try exclusive but already write: fail */
933 else if (dce > 0 && pw > 0)
935 /* If we try write but already exclusive: fail */
936 else if (dcw > 0 && pe > 0)
938 /* If we try to open more but provider is error'ed: fail */
939 else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0)
949 gp->flags |= G_GEOM_IN_ACCESS;
950 error = gp->access(pp, dcr, dcw, dce);
951 KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0,
952 ("Geom provider %s::%s dcr=%d dcw=%d dce=%d error=%d failed "
953 "closing ->access()", gp->class->name, pp->name, dcr, dcw,
957 gp->flags &= ~G_GEOM_IN_ACCESS;
958 KASSERT(cp->acr == sr && cp->acw == sw && cp->ace == se,
959 ("Access counts changed during geom->access"));
960 if ((gp->flags & G_GEOM_ACCESS_WAIT) != 0) {
961 gp->flags &= ~G_GEOM_ACCESS_WAIT;
967 * If we open first write, spoil any partner consumers.
968 * If we close last write and provider is not errored,
971 if (pp->acw == 0 && dcw != 0)
973 else if (pp->acw != 0 && pp->acw == -dcw && pp->error == 0 &&
974 !(gp->flags & G_GEOM_WITHER))
975 g_post_event(g_new_provider_event, pp, M_WAITOK,
984 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)
985 KASSERT(pp->sectorsize > 0,
986 ("Provider %s lacks sectorsize", pp->name));
987 if ((cp->geom->flags & G_GEOM_WITHER) &&
988 cp->acr == 0 && cp->acw == 0 && cp->ace == 0)
995 g_handleattr_int(struct bio *bp, const char *attribute, int val)
998 return (g_handleattr(bp, attribute, &val, sizeof val));
1002 g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val)
1005 return (g_handleattr(bp, attribute, &val, sizeof val));
1009 g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val)
1012 return (g_handleattr(bp, attribute, &val, sizeof val));
1016 g_handleattr_str(struct bio *bp, const char *attribute, const char *str)
1019 return (g_handleattr(bp, attribute, str, 0));
1023 g_handleattr(struct bio *bp, const char *attribute, const void *val, int len)
1027 if (strcmp(bp->bio_attribute, attribute))
1030 bzero(bp->bio_data, bp->bio_length);
1031 if (strlcpy(bp->bio_data, val, bp->bio_length) >=
1033 printf("%s: %s bio_length %jd len %zu -> EFAULT\n",
1034 __func__, bp->bio_to->name,
1035 (intmax_t)bp->bio_length, strlen(val));
1038 } else if (bp->bio_length == len) {
1039 bcopy(val, bp->bio_data, len);
1041 printf("%s: %s bio_length %jd len %d -> EFAULT\n", __func__,
1042 bp->bio_to->name, (intmax_t)bp->bio_length, len);
1046 bp->bio_completed = bp->bio_length;
1047 g_io_deliver(bp, error);
1052 g_std_access(struct g_provider *pp,
1053 int dr __unused, int dw __unused, int de __unused)
1056 g_topology_assert();
1057 G_VALID_PROVIDER(pp);
1062 g_std_done(struct bio *bp)
1066 bp2 = bp->bio_parent;
1067 if (bp2->bio_error == 0)
1068 bp2->bio_error = bp->bio_error;
1069 bp2->bio_completed += bp->bio_completed;
1072 if (bp2->bio_children == bp2->bio_inbed)
1073 g_io_deliver(bp2, bp2->bio_error);
1076 /* XXX: maybe this is only g_slice_spoiled */
1079 g_std_spoiled(struct g_consumer *cp)
1082 struct g_provider *pp;
1084 g_topology_assert();
1085 G_VALID_CONSUMER(cp);
1086 g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
1087 cp->flags |= G_CF_ORPHAN;
1090 LIST_FOREACH(pp, &gp->provider, provider)
1091 g_orphan_provider(pp, ENXIO);
1092 g_destroy_consumer(cp);
1093 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))
1096 gp->flags |= G_GEOM_WITHER;
1100 * Spoiling happens when a provider is opened for writing, but consumers
1101 * which are configured by in-band data are attached (slicers for instance).
1102 * Since the write might potentially change the in-band data, such consumers
1103 * need to re-evaluate their existence after the writing session closes.
1104 * We do this by (offering to) tear them down when the open for write happens
1105 * in return for a re-taste when it closes again.
1106 * Together with the fact that such consumers grab an 'e' bit whenever they
1107 * are open, regardless of mode, this ends up DTRT.
1111 g_spoil_event(void *arg, int flag)
1113 struct g_provider *pp;
1114 struct g_consumer *cp, *cp2;
1116 g_topology_assert();
1117 if (flag == EV_CANCEL)
1120 G_VALID_PROVIDER(pp);
1121 g_trace(G_T_TOPOLOGY, "%s %p(%s:%s:%s)", __func__, pp,
1122 pp->geom->class->name, pp->geom->name, pp->name);
1123 for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) {
1124 cp2 = LIST_NEXT(cp, consumers);
1125 if ((cp->flags & G_CF_SPOILED) == 0)
1127 cp->flags &= ~G_CF_SPOILED;
1128 if (cp->geom->spoiled == NULL)
1130 cp->geom->spoiled(cp);
1131 g_topology_assert();
1136 g_spoil(struct g_provider *pp, struct g_consumer *cp)
1138 struct g_consumer *cp2;
1140 g_topology_assert();
1141 G_VALID_PROVIDER(pp);
1142 G_VALID_CONSUMER(cp);
1144 LIST_FOREACH(cp2, &pp->consumers, consumers) {
1148 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr));
1149 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw));
1151 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace));
1152 cp2->flags |= G_CF_SPOILED;
1154 g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL);
1158 g_media_changed_event(void *arg, int flag)
1160 struct g_provider *pp;
1163 g_topology_assert();
1164 if (flag == EV_CANCEL)
1167 G_VALID_PROVIDER(pp);
1170 * If provider was not open for writing, queue retaste after spoiling.
1171 * If it was, retaste will happen automatically on close.
1173 retaste = (pp->acw == 0 && pp->error == 0 &&
1174 !(pp->geom->flags & G_GEOM_WITHER));
1175 g_spoil_event(arg, flag);
1177 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, NULL);
1181 g_media_changed(struct g_provider *pp, int flag)
1183 struct g_consumer *cp;
1185 LIST_FOREACH(cp, &pp->consumers, consumers)
1186 cp->flags |= G_CF_SPOILED;
1187 return (g_post_event(g_media_changed_event, pp, flag, pp, NULL));
1191 g_media_gone(struct g_provider *pp, int flag)
1193 struct g_consumer *cp;
1195 LIST_FOREACH(cp, &pp->consumers, consumers)
1196 cp->flags |= G_CF_SPOILED;
1197 return (g_post_event(g_spoil_event, pp, flag, pp, NULL));
1201 g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
1206 error = g_io_getattr(attr, cp, &i, var);
1215 g_get_device_prefix_len(const char *name)
1219 if (strncmp(name, "ada", 3) == 0)
1221 else if (strncmp(name, "ad", 2) == 0)
1225 if (name[len] < '0' || name[len] > '9')
1229 } while (name[len] >= '0' && name[len] <= '9');
1234 g_compare_names(const char *namea, const char *nameb)
1238 if (strcmp(namea, nameb) == 0)
1240 deva = g_get_device_prefix_len(namea);
1243 devb = g_get_device_prefix_len(nameb);
1246 if (strcmp(namea + deva, nameb + devb) == 0)
1251 #if defined(DIAGNOSTIC) || defined(DDB)
1253 * This function walks the mesh and returns a non-zero integer if it
1254 * finds the argument pointer is an object. The return value indicates
1255 * which type of object it is believed to be. If topology is not locked,
1256 * this function is potentially dangerous, but we don't assert that the
1257 * topology lock is held when called from debugger.
1260 g_valid_obj(void const *ptr)
1264 struct g_consumer *cp;
1265 struct g_provider *pp;
1268 if (kdb_active == 0)
1270 g_topology_assert();
1272 LIST_FOREACH(mp, &g_classes, class) {
1275 LIST_FOREACH(gp, &mp->geom, geom) {
1278 LIST_FOREACH(cp, &gp->consumer, consumer)
1281 LIST_FOREACH(pp, &gp->provider, provider)
1292 #define gprintf(...) do { \
1293 db_printf("%*s", indent, ""); \
1294 db_printf(__VA_ARGS__); \
1296 #define gprintln(...) do { \
1297 gprintf(__VA_ARGS__); \
1301 #define ADDFLAG(obj, flag, sflag) do { \
1302 if ((obj)->flags & (flag)) { \
1304 strlcat(str, ",", size); \
1305 strlcat(str, (sflag), size); \
1311 provider_flags_to_string(struct g_provider *pp, char *str, size_t size)
1316 if (pp->flags == 0) {
1317 strlcpy(str, "NONE", size);
1320 ADDFLAG(pp, G_PF_WITHER, "G_PF_WITHER");
1321 ADDFLAG(pp, G_PF_ORPHAN, "G_PF_ORPHAN");
1326 geom_flags_to_string(struct g_geom *gp, char *str, size_t size)
1331 if (gp->flags == 0) {
1332 strlcpy(str, "NONE", size);
1335 ADDFLAG(gp, G_GEOM_WITHER, "G_GEOM_WITHER");
1339 db_show_geom_consumer(int indent, struct g_consumer *cp)
1343 gprintln("consumer: %p", cp);
1344 gprintln(" class: %s (%p)", cp->geom->class->name,
1346 gprintln(" geom: %s (%p)", cp->geom->name, cp->geom);
1347 if (cp->provider == NULL)
1348 gprintln(" provider: none");
1350 gprintln(" provider: %s (%p)", cp->provider->name,
1353 gprintln(" access: r%dw%de%d", cp->acr, cp->acw, cp->ace);
1354 gprintln(" flags: 0x%04x", cp->flags);
1355 gprintln(" nstart: %u", cp->nstart);
1356 gprintln(" nend: %u", cp->nend);
1358 gprintf("consumer: %p (%s), access=r%dw%de%d", cp,
1359 cp->provider != NULL ? cp->provider->name : "none",
1360 cp->acr, cp->acw, cp->ace);
1362 db_printf(", flags=0x%04x", cp->flags);
1368 db_show_geom_provider(int indent, struct g_provider *pp)
1370 struct g_consumer *cp;
1374 gprintln("provider: %s (%p)", pp->name, pp);
1375 gprintln(" class: %s (%p)", pp->geom->class->name,
1377 gprintln(" geom: %s (%p)", pp->geom->name, pp->geom);
1378 gprintln(" mediasize: %jd", (intmax_t)pp->mediasize);
1379 gprintln(" sectorsize: %u", pp->sectorsize);
1380 gprintln(" stripesize: %u", pp->stripesize);
1381 gprintln(" stripeoffset: %u", pp->stripeoffset);
1382 gprintln(" access: r%dw%de%d", pp->acr, pp->acw,
1384 gprintln(" flags: %s (0x%04x)",
1385 provider_flags_to_string(pp, flags, sizeof(flags)),
1387 gprintln(" error: %d", pp->error);
1388 gprintln(" nstart: %u", pp->nstart);
1389 gprintln(" nend: %u", pp->nend);
1390 if (LIST_EMPTY(&pp->consumers))
1391 gprintln(" consumers: none");
1393 gprintf("provider: %s (%p), access=r%dw%de%d",
1394 pp->name, pp, pp->acr, pp->acw, pp->ace);
1395 if (pp->flags != 0) {
1396 db_printf(", flags=%s (0x%04x)",
1397 provider_flags_to_string(pp, flags, sizeof(flags)),
1402 if (!LIST_EMPTY(&pp->consumers)) {
1403 LIST_FOREACH(cp, &pp->consumers, consumers) {
1404 db_show_geom_consumer(indent + 2, cp);
1412 db_show_geom_geom(int indent, struct g_geom *gp)
1414 struct g_provider *pp;
1415 struct g_consumer *cp;
1419 gprintln("geom: %s (%p)", gp->name, gp);
1420 gprintln(" class: %s (%p)", gp->class->name, gp->class);
1421 gprintln(" flags: %s (0x%04x)",
1422 geom_flags_to_string(gp, flags, sizeof(flags)), gp->flags);
1423 gprintln(" rank: %d", gp->rank);
1424 if (LIST_EMPTY(&gp->provider))
1425 gprintln(" providers: none");
1426 if (LIST_EMPTY(&gp->consumer))
1427 gprintln(" consumers: none");
1429 gprintf("geom: %s (%p), rank=%d", gp->name, gp, gp->rank);
1430 if (gp->flags != 0) {
1431 db_printf(", flags=%s (0x%04x)",
1432 geom_flags_to_string(gp, flags, sizeof(flags)),
1437 if (!LIST_EMPTY(&gp->provider)) {
1438 LIST_FOREACH(pp, &gp->provider, provider) {
1439 db_show_geom_provider(indent + 2, pp);
1444 if (!LIST_EMPTY(&gp->consumer)) {
1445 LIST_FOREACH(cp, &gp->consumer, consumer) {
1446 db_show_geom_consumer(indent + 2, cp);
1454 db_show_geom_class(struct g_class *mp)
1458 db_printf("class: %s (%p)\n", mp->name, mp);
1459 LIST_FOREACH(gp, &mp->geom, geom) {
1460 db_show_geom_geom(2, gp);
1467 * Print the GEOM topology or the given object.
1469 DB_SHOW_COMMAND(geom, db_show_geom)
1474 /* No address given, print the entire topology. */
1475 LIST_FOREACH(mp, &g_classes, class) {
1476 db_show_geom_class(mp);
1482 switch (g_valid_obj((void *)addr)) {
1484 db_show_geom_class((struct g_class *)addr);
1487 db_show_geom_geom(0, (struct g_geom *)addr);
1490 db_show_geom_consumer(0, (struct g_consumer *)addr);
1493 db_show_geom_provider(0, (struct g_provider *)addr);
1496 db_printf("Not a GEOM object.\n");
1503 db_print_bio_cmd(struct bio *bp)
1505 db_printf(" cmd: ");
1506 switch (bp->bio_cmd) {
1507 case BIO_READ: db_printf("BIO_READ"); break;
1508 case BIO_WRITE: db_printf("BIO_WRITE"); break;
1509 case BIO_DELETE: db_printf("BIO_DELETE"); break;
1510 case BIO_GETATTR: db_printf("BIO_GETATTR"); break;
1511 case BIO_FLUSH: db_printf("BIO_FLUSH"); break;
1512 case BIO_CMD0: db_printf("BIO_CMD0"); break;
1513 case BIO_CMD1: db_printf("BIO_CMD1"); break;
1514 case BIO_CMD2: db_printf("BIO_CMD2"); break;
1515 default: db_printf("UNKNOWN"); break;
1521 db_print_bio_flags(struct bio *bp)
1526 db_printf(" flags: ");
1527 if (bp->bio_flags & BIO_ERROR) {
1528 db_printf("BIO_ERROR");
1531 if (bp->bio_flags & BIO_DONE) {
1532 db_printf("%sBIO_DONE", (comma ? ", " : ""));
1535 if (bp->bio_flags & BIO_ONQUEUE)
1536 db_printf("%sBIO_ONQUEUE", (comma ? ", " : ""));
1541 * Print useful information in a BIO
1543 DB_SHOW_COMMAND(bio, db_show_bio)
1548 bp = (struct bio *)addr;
1549 db_printf("BIO %p\n", bp);
1550 db_print_bio_cmd(bp);
1551 db_print_bio_flags(bp);
1552 db_printf(" cflags: 0x%hhx\n", bp->bio_cflags);
1553 db_printf(" pflags: 0x%hhx\n", bp->bio_pflags);
1554 db_printf(" offset: %jd\n", (intmax_t)bp->bio_offset);
1555 db_printf(" length: %jd\n", (intmax_t)bp->bio_length);
1556 db_printf(" bcount: %ld\n", bp->bio_bcount);
1557 db_printf(" resid: %ld\n", bp->bio_resid);
1558 db_printf(" completed: %jd\n", (intmax_t)bp->bio_completed);
1559 db_printf(" children: %u\n", bp->bio_children);
1560 db_printf(" inbed: %u\n", bp->bio_inbed);
1561 db_printf(" error: %d\n", bp->bio_error);
1562 db_printf(" parent: %p\n", bp->bio_parent);
1563 db_printf(" driver1: %p\n", bp->bio_driver1);
1564 db_printf(" driver2: %p\n", bp->bio_driver2);
1565 db_printf(" caller1: %p\n", bp->bio_caller1);
1566 db_printf(" caller2: %p\n", bp->bio_caller2);
1567 db_printf(" bio_from: %p\n", bp->bio_from);
1568 db_printf(" bio_to: %p\n", bp->bio_to);