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;
77 * This event offers a new class a chance to taste all preexisting providers.
80 g_load_class(void *arg, int flag)
83 struct g_class *mp2, *mp;
85 struct g_provider *pp;
88 if (flag == EV_CANCEL) /* XXX: can't happen ? */
100 g_trace(G_T_TOPOLOGY, "g_load_class(%s)", mp->name);
101 KASSERT(mp->name != NULL && *mp->name != '\0',
102 ("GEOM class has no name"));
103 LIST_FOREACH(mp2, &g_classes, class) {
105 printf("The GEOM class %s is already loaded.\n",
110 } else if (strcmp(mp2->name, mp->name) == 0) {
111 printf("A GEOM class %s is already loaded.\n",
119 LIST_INIT(&mp->geom);
120 LIST_INSERT_HEAD(&g_classes, mp, class);
121 if (mp->init != NULL)
123 if (mp->taste == NULL)
125 LIST_FOREACH(mp2, &g_classes, class) {
128 LIST_FOREACH(gp, &mp2->geom, geom) {
129 LIST_FOREACH(pp, &gp->provider, provider) {
130 mp->taste(mp, pp, 0);
138 g_unload_class(struct g_class *mp)
141 struct g_provider *pp;
142 struct g_consumer *cp;
146 g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name);
149 LIST_FOREACH(gp, &mp->geom, geom) {
150 /* We refuse to unload if anything is open */
151 LIST_FOREACH(pp, &gp->provider, provider)
152 if (pp->acr || pp->acw || pp->ace) {
156 LIST_FOREACH(cp, &gp->consumer, consumer)
157 if (cp->acr || cp->acw || cp->ace) {
161 /* If the geom is withering, wait for it to finish. */
162 if (gp->flags & G_GEOM_WITHER) {
163 g_topology_sleep(mp, 1);
169 * We allow unloading if we have no geoms, or a class
170 * method we can use to get rid of them.
172 if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) {
177 /* Bar new entries */
181 LIST_FOREACH(gp, &mp->geom, geom) {
182 error = mp->destroy_geom(NULL, mp, gp);
188 /* Wait for withering to finish. */
190 gp = LIST_FIRST(&mp->geom);
193 KASSERT(gp->flags & G_GEOM_WITHER,
194 ("Non-withering geom in class %s", mp->name));
195 g_topology_sleep(mp, 1);
198 if (mp->fini != NULL)
200 LIST_REMOVE(mp, class);
207 g_modevent(module_t mod, int type, void *data)
211 static int g_ignition;
215 if (mp->version != G_VERSION) {
216 printf("GEOM class %s has Wrong version %x\n",
217 mp->name, mp->version);
227 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", mp->name);
228 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
231 * Once the system is not cold, MOD_LOAD calls will be
232 * from the userland and the g_event thread will be able
233 * to acknowledge their completion.
237 error = g_post_event(g_load_class, hh, M_WAITOK, NULL);
239 error = g_waitfor_event(g_load_class, hh, M_WAITOK,
247 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", mp->name);
249 error = g_unload_class(mp);
252 KASSERT(LIST_EMPTY(&mp->geom),
253 ("Unloaded class (%s) still has geom", mp->name));
261 g_retaste_event(void *arg, int flag)
263 struct g_class *cp, *mp;
264 struct g_geom *gp, *gp2;
266 struct g_provider *pp;
269 if (flag == EV_CANCEL) /* XXX: can't happen ? */
281 g_trace(G_T_TOPOLOGY, "g_retaste(%s)", mp->name);
283 LIST_FOREACH(cp, &g_classes, class) {
284 LIST_FOREACH(gp, &cp->geom, geom) {
285 LIST_FOREACH(pp, &gp->provider, provider) {
286 if (pp->acr || pp->acw || pp->ace)
288 LIST_FOREACH(gp2, &mp->geom, geom) {
289 if (!strcmp(pp->name, gp2->name))
293 g_wither_geom(gp2, ENXIO);
294 mp->taste(mp, pp, 0);
302 g_retaste(struct g_class *mp)
307 if (mp->taste == NULL)
310 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
315 error = g_post_event(g_retaste_event, hh, M_WAITOK, NULL);
317 error = g_waitfor_event(g_retaste_event, hh, M_WAITOK, NULL);
327 g_new_geomf(struct g_class *mp, const char *fmt, ...)
335 sb = sbuf_new_auto();
337 sbuf_vprintf(sb, fmt, ap);
340 gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO);
341 gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
344 LIST_INIT(&gp->consumer);
345 LIST_INIT(&gp->provider);
346 LIST_INSERT_HEAD(&mp->geom, gp, geom);
347 TAILQ_INSERT_HEAD(&geoms, gp, geoms);
348 strcpy(gp->name, sbuf_data(sb));
350 /* Fill in defaults from class */
351 gp->start = mp->start;
352 gp->spoiled = mp->spoiled;
353 gp->dumpconf = mp->dumpconf;
354 gp->access = mp->access;
355 gp->orphan = mp->orphan;
356 gp->ioctl = mp->ioctl;
361 g_destroy_geom(struct g_geom *gp)
366 g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name);
367 KASSERT(LIST_EMPTY(&gp->consumer),
368 ("g_destroy_geom(%s) with consumer(s) [%p]",
369 gp->name, LIST_FIRST(&gp->consumer)));
370 KASSERT(LIST_EMPTY(&gp->provider),
371 ("g_destroy_geom(%s) with provider(s) [%p]",
372 gp->name, LIST_FIRST(&gp->provider)));
374 LIST_REMOVE(gp, geom);
375 TAILQ_REMOVE(&geoms, gp, geoms);
381 * This function is called (repeatedly) until the geom has withered away.
384 g_wither_geom(struct g_geom *gp, int error)
386 struct g_provider *pp;
390 g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name);
391 if (!(gp->flags & G_GEOM_WITHER)) {
392 gp->flags |= G_GEOM_WITHER;
393 LIST_FOREACH(pp, &gp->provider, provider)
394 if (!(pp->flags & G_PF_ORPHAN))
395 g_orphan_provider(pp, error);
401 * Convenience function to destroy a particular provider.
404 g_wither_provider(struct g_provider *pp, int error)
407 pp->flags |= G_PF_WITHER;
408 if (!(pp->flags & G_PF_ORPHAN))
409 g_orphan_provider(pp, error);
413 * This function is called (repeatedly) until the has withered away.
416 g_wither_geom_close(struct g_geom *gp, int error)
418 struct g_consumer *cp;
422 g_trace(G_T_TOPOLOGY, "g_wither_geom_close(%p(%s))", gp, gp->name);
423 LIST_FOREACH(cp, &gp->consumer, consumer)
424 if (cp->acr || cp->acw || cp->ace)
425 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
426 g_wither_geom(gp, error);
430 * This function is called (repeatedly) until we cant wash away more
431 * withered bits at present. Return value contains two bits. Bit 0
432 * set means "withering stuff we can't wash now", bit 1 means "call
433 * me again, there may be stuff I didn't get the first time around.
439 struct g_geom *gp, *gp2;
440 struct g_provider *pp, *pp2;
441 struct g_consumer *cp, *cp2;
446 LIST_FOREACH(mp, &g_classes, class) {
447 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
448 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
449 if (!(pp->flags & G_PF_WITHER))
451 if (LIST_EMPTY(&pp->consumers))
452 g_destroy_provider(pp);
456 if (!(gp->flags & G_GEOM_WITHER))
458 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
459 if (LIST_EMPTY(&pp->consumers))
460 g_destroy_provider(pp);
464 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) {
465 if (cp->acr || cp->acw || cp->ace) {
469 if (cp->provider != NULL)
471 g_destroy_consumer(cp);
474 if (LIST_EMPTY(&gp->provider) &&
475 LIST_EMPTY(&gp->consumer))
485 g_new_consumer(struct g_geom *gp)
487 struct g_consumer *cp;
491 KASSERT(!(gp->flags & G_GEOM_WITHER),
492 ("g_new_consumer on WITHERing geom(%s) (class %s)",
493 gp->name, gp->class->name));
494 KASSERT(gp->orphan != NULL,
495 ("g_new_consumer on geom(%s) (class %s) without orphan",
496 gp->name, gp->class->name));
498 cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO);
500 cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED,
501 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
502 LIST_INSERT_HEAD(&gp->consumer, cp, consumer);
507 g_destroy_consumer(struct g_consumer *cp)
512 G_VALID_CONSUMER(cp);
513 g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp);
514 KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached"));
515 KASSERT (cp->acr == 0, ("g_destroy_consumer with acr"));
516 KASSERT (cp->acw == 0, ("g_destroy_consumer with acw"));
517 KASSERT (cp->ace == 0, ("g_destroy_consumer with ace"));
520 LIST_REMOVE(cp, consumer);
521 devstat_remove_entry(cp->stat);
523 if (gp->flags & G_GEOM_WITHER)
528 g_new_provider_event(void *arg, int flag)
531 struct g_provider *pp;
532 struct g_consumer *cp;
535 if (flag == EV_CANCEL)
540 G_VALID_PROVIDER(pp);
541 KASSERT(!(pp->flags & G_PF_WITHER),
542 ("g_new_provider_event but withered"));
543 LIST_FOREACH(mp, &g_classes, class) {
544 if (mp->taste == NULL)
546 LIST_FOREACH(cp, &pp->consumers, consumers)
547 if (cp->geom->class == mp)
551 mp->taste(mp, pp, 0);
558 g_new_providerf(struct g_geom *gp, const char *fmt, ...)
560 struct g_provider *pp;
566 KASSERT(gp->access != NULL,
567 ("new provider on geom(%s) without ->access (class %s)",
568 gp->name, gp->class->name));
569 KASSERT(gp->start != NULL,
570 ("new provider on geom(%s) without ->start (class %s)",
571 gp->name, gp->class->name));
572 KASSERT(!(gp->flags & G_GEOM_WITHER),
573 ("new provider on WITHERing geom(%s) (class %s)",
574 gp->name, gp->class->name));
575 sb = sbuf_new_auto();
577 sbuf_vprintf(sb, fmt, ap);
580 pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
581 pp->name = (char *)(pp + 1);
582 strcpy(pp->name, sbuf_data(sb));
584 LIST_INIT(&pp->consumers);
587 pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED,
588 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
589 LIST_INSERT_HEAD(&gp->provider, pp, provider);
590 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, gp, NULL);
595 g_error_provider(struct g_provider *pp, int error)
598 /* G_VALID_PROVIDER(pp); We may not have g_topology */
603 #define _PATH_DEV "/dev/"
607 g_provider_by_name(char const *arg)
611 struct g_provider *pp;
613 if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
614 arg += sizeof(_PATH_DEV) - 1;
616 LIST_FOREACH(cp, &g_classes, class) {
617 LIST_FOREACH(gp, &cp->geom, geom) {
618 LIST_FOREACH(pp, &gp->provider, provider) {
619 if (!strcmp(arg, pp->name))
629 g_destroy_provider(struct g_provider *pp)
634 G_VALID_PROVIDER(pp);
635 KASSERT(LIST_EMPTY(&pp->consumers),
636 ("g_destroy_provider but attached"));
637 KASSERT (pp->acr == 0, ("g_destroy_provider with acr"));
638 KASSERT (pp->acw == 0, ("g_destroy_provider with acw"));
639 KASSERT (pp->ace == 0, ("g_destroy_provider with ace"));
641 LIST_REMOVE(pp, provider);
643 devstat_remove_entry(pp->stat);
645 if ((gp->flags & G_GEOM_WITHER))
650 * We keep the "geoms" list sorted by topological order (== increasing
651 * numerical rank) at all times.
652 * When an attach is done, the attaching geoms rank is invalidated
653 * and it is moved to the tail of the list.
654 * All geoms later in the sequence has their ranks reevaluated in
655 * sequence. If we cannot assign rank to a geom because it's
656 * prerequisites do not have rank, we move that element to the tail
657 * of the sequence with invalid rank as well.
658 * At some point we encounter our original geom and if we stil fail
659 * to assign it a rank, there must be a loop and we fail back to
660 * g_attach() which detach again and calls redo_rank again
661 * to fix up the damage.
662 * It would be much simpler code wise to do it recursively, but we
663 * can't risk that on the kernel stack.
667 redo_rank(struct g_geom *gp)
669 struct g_consumer *cp;
670 struct g_geom *gp1, *gp2;
676 /* Invalidate this geoms rank and move it to the tail */
677 gp1 = TAILQ_NEXT(gp, geoms);
680 TAILQ_REMOVE(&geoms, gp, geoms);
681 TAILQ_INSERT_TAIL(&geoms, gp, geoms);
686 /* re-rank the rest of the sequence */
687 for (; gp1 != NULL; gp1 = gp2) {
690 LIST_FOREACH(cp, &gp1->consumer, consumer) {
691 if (cp->provider == NULL)
693 n = cp->provider->geom->rank;
701 gp2 = TAILQ_NEXT(gp1, geoms);
703 /* got a rank, moving on */
707 /* no rank to original geom means loop */
711 /* no rank, put it at the end move on */
712 TAILQ_REMOVE(&geoms, gp1, geoms);
713 TAILQ_INSERT_TAIL(&geoms, gp1, geoms);
719 g_attach(struct g_consumer *cp, struct g_provider *pp)
724 G_VALID_CONSUMER(cp);
725 G_VALID_PROVIDER(pp);
726 KASSERT(cp->provider == NULL, ("attach but attached"));
728 LIST_INSERT_HEAD(&pp->consumers, cp, consumers);
729 error = redo_rank(cp->geom);
731 LIST_REMOVE(cp, consumers);
739 g_detach(struct g_consumer *cp)
741 struct g_provider *pp;
744 G_VALID_CONSUMER(cp);
745 g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp);
746 KASSERT(cp->provider != NULL, ("detach but not attached"));
747 KASSERT(cp->acr == 0, ("detach but nonzero acr"));
748 KASSERT(cp->acw == 0, ("detach but nonzero acw"));
749 KASSERT(cp->ace == 0, ("detach but nonzero ace"));
750 KASSERT(cp->nstart == cp->nend,
751 ("detach with active requests"));
753 LIST_REMOVE(cp, consumers);
755 if (pp->geom->flags & G_GEOM_WITHER)
757 else if (pp->flags & G_PF_WITHER)
765 * Access-check with delta values. The question asked is "can provider
766 * "cp" change the access counters by the relative amounts dc[rwe] ?"
770 g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
772 struct g_provider *pp;
777 G_VALID_CONSUMER(cp);
779 KASSERT(pp != NULL, ("access but not attached"));
780 G_VALID_PROVIDER(pp);
782 g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
783 cp, pp->name, dcr, dcw, dce);
785 KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr"));
786 KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw"));
787 KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace"));
788 KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request"));
789 KASSERT(pp->geom->access != NULL, ("NULL geom->access"));
792 * If our class cares about being spoiled, and we have been, we
793 * are probably just ahead of the event telling us that. Fail
794 * now rather than having to unravel this later.
796 if (cp->geom->spoiled != NULL && cp->spoiled &&
797 (dcr > 0 || dcw > 0 || dce > 0))
801 * Figure out what counts the provider would have had, if this
802 * consumer had (r0w0e0) at this time.
804 pr = pp->acr - cp->acr;
805 pw = pp->acw - cp->acw;
806 pe = pp->ace - cp->ace;
809 "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)",
811 cp->acr, cp->acw, cp->ace,
812 pp->acr, pp->acw, pp->ace,
815 /* If foot-shooting is enabled, any open on rank#1 is OK */
816 if ((g_debugflags & 16) && pp->geom->rank == 1)
818 /* If we try exclusive but already write: fail */
819 else if (dce > 0 && pw > 0)
821 /* If we try write but already exclusive: fail */
822 else if (dcw > 0 && pe > 0)
824 /* If we try to open more but provider is error'ed: fail */
825 else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0)
830 error = pp->geom->access(pp, dcr, dcw, dce);
831 KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0,
832 ("Geom provider %s::%s dcr=%d dcw=%d dce=%d error=%d failed "
833 "closing ->access()", pp->geom->class->name, pp->name, dcr, dcw,
837 * If we open first write, spoil any partner consumers.
838 * If we close last write and provider is not errored,
841 if (pp->acw == 0 && dcw != 0)
843 else if (pp->acw != 0 && pp->acw == -dcw && pp->error == 0 &&
844 !(pp->geom->flags & G_GEOM_WITHER))
845 g_post_event(g_new_provider_event, pp, M_WAITOK,
854 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)
855 KASSERT(pp->sectorsize > 0,
856 ("Provider %s lacks sectorsize", pp->name));
862 g_handleattr_int(struct bio *bp, const char *attribute, int val)
865 return (g_handleattr(bp, attribute, &val, sizeof val));
869 g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val)
872 return (g_handleattr(bp, attribute, &val, sizeof val));
876 g_handleattr_str(struct bio *bp, const char *attribute, const char *str)
879 return (g_handleattr(bp, attribute, str, 0));
883 g_handleattr(struct bio *bp, const char *attribute, const void *val, int len)
887 if (strcmp(bp->bio_attribute, attribute))
890 bzero(bp->bio_data, bp->bio_length);
891 if (strlcpy(bp->bio_data, val, bp->bio_length) >=
893 printf("%s: %s bio_length %jd len %zu -> EFAULT\n",
894 __func__, bp->bio_to->name,
895 (intmax_t)bp->bio_length, strlen(val));
898 } else if (bp->bio_length == len) {
899 bcopy(val, bp->bio_data, len);
901 printf("%s: %s bio_length %jd len %d -> EFAULT\n", __func__,
902 bp->bio_to->name, (intmax_t)bp->bio_length, len);
906 bp->bio_completed = bp->bio_length;
907 g_io_deliver(bp, error);
912 g_std_access(struct g_provider *pp,
913 int dr __unused, int dw __unused, int de __unused)
917 G_VALID_PROVIDER(pp);
922 g_std_done(struct bio *bp)
926 bp2 = bp->bio_parent;
927 if (bp2->bio_error == 0)
928 bp2->bio_error = bp->bio_error;
929 bp2->bio_completed += bp->bio_completed;
932 if (bp2->bio_children == bp2->bio_inbed)
933 g_io_deliver(bp2, bp2->bio_error);
936 /* XXX: maybe this is only g_slice_spoiled */
939 g_std_spoiled(struct g_consumer *cp)
942 struct g_provider *pp;
945 G_VALID_CONSUMER(cp);
946 g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
949 LIST_FOREACH(pp, &gp->provider, provider)
950 g_orphan_provider(pp, ENXIO);
951 g_destroy_consumer(cp);
952 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))
955 gp->flags |= G_GEOM_WITHER;
959 * Spoiling happens when a provider is opened for writing, but consumers
960 * which are configured by in-band data are attached (slicers for instance).
961 * Since the write might potentially change the in-band data, such consumers
962 * need to re-evaluate their existence after the writing session closes.
963 * We do this by (offering to) tear them down when the open for write happens
964 * in return for a re-taste when it closes again.
965 * Together with the fact that such consumers grab an 'e' bit whenever they
966 * are open, regardless of mode, this ends up DTRT.
970 g_spoil_event(void *arg, int flag)
972 struct g_provider *pp;
973 struct g_consumer *cp, *cp2;
976 if (flag == EV_CANCEL)
979 G_VALID_PROVIDER(pp);
980 for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) {
981 cp2 = LIST_NEXT(cp, consumers);
985 if (cp->geom->spoiled == NULL)
987 cp->geom->spoiled(cp);
993 g_spoil(struct g_provider *pp, struct g_consumer *cp)
995 struct g_consumer *cp2;
998 G_VALID_PROVIDER(pp);
999 G_VALID_CONSUMER(cp);
1001 LIST_FOREACH(cp2, &pp->consumers, consumers) {
1005 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr));
1006 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw));
1008 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace));
1011 g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL);
1015 g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
1020 error = g_io_getattr(attr, cp, &i, var);
1029 g_get_device_prefix_len(const char *name)
1033 if (strncmp(name, "ada", 3) == 0)
1035 else if (strncmp(name, "ad", 2) == 0)
1039 if (name[len] < '0' || name[len] > '9')
1043 } while (name[len] >= '0' && name[len] <= '9');
1048 g_compare_names(const char *namea, const char *nameb)
1052 if (strcmp(namea, nameb) == 0)
1054 deva = g_get_device_prefix_len(namea);
1057 devb = g_get_device_prefix_len(nameb);
1060 if (strcmp(namea + deva, nameb + devb) == 0)
1065 #if defined(DIAGNOSTIC) || defined(DDB)
1067 * This function walks the mesh and returns a non-zero integer if it
1068 * finds the argument pointer is an object. The return value indicates
1069 * which type of object it is believed to be. If topology is not locked,
1070 * this function is potentially dangerous, but we don't assert that the
1071 * topology lock is held when called from debugger.
1074 g_valid_obj(void const *ptr)
1078 struct g_consumer *cp;
1079 struct g_provider *pp;
1082 if (kdb_active == 0)
1084 g_topology_assert();
1086 LIST_FOREACH(mp, &g_classes, class) {
1089 LIST_FOREACH(gp, &mp->geom, geom) {
1092 LIST_FOREACH(cp, &gp->consumer, consumer)
1095 LIST_FOREACH(pp, &gp->provider, provider)
1106 #define gprintf(...) do { \
1107 db_printf("%*s", indent, ""); \
1108 db_printf(__VA_ARGS__); \
1110 #define gprintln(...) do { \
1111 gprintf(__VA_ARGS__); \
1115 #define ADDFLAG(obj, flag, sflag) do { \
1116 if ((obj)->flags & (flag)) { \
1118 strlcat(str, ",", size); \
1119 strlcat(str, (sflag), size); \
1125 provider_flags_to_string(struct g_provider *pp, char *str, size_t size)
1130 if (pp->flags == 0) {
1131 strlcpy(str, "NONE", size);
1134 ADDFLAG(pp, G_PF_CANDELETE, "G_PF_CANDELETE");
1135 ADDFLAG(pp, G_PF_WITHER, "G_PF_WITHER");
1136 ADDFLAG(pp, G_PF_ORPHAN, "G_PF_ORPHAN");
1141 geom_flags_to_string(struct g_geom *gp, char *str, size_t size)
1146 if (gp->flags == 0) {
1147 strlcpy(str, "NONE", size);
1150 ADDFLAG(gp, G_GEOM_WITHER, "G_GEOM_WITHER");
1154 db_show_geom_consumer(int indent, struct g_consumer *cp)
1158 gprintln("consumer: %p", cp);
1159 gprintln(" class: %s (%p)", cp->geom->class->name,
1161 gprintln(" geom: %s (%p)", cp->geom->name, cp->geom);
1162 if (cp->provider == NULL)
1163 gprintln(" provider: none");
1165 gprintln(" provider: %s (%p)", cp->provider->name,
1168 gprintln(" access: r%dw%de%d", cp->acr, cp->acw, cp->ace);
1169 gprintln(" spoiled: %d", cp->spoiled);
1170 gprintln(" nstart: %u", cp->nstart);
1171 gprintln(" nend: %u", cp->nend);
1173 gprintf("consumer: %p (%s), access=r%dw%de%d", cp,
1174 cp->provider != NULL ? cp->provider->name : "none",
1175 cp->acr, cp->acw, cp->ace);
1177 db_printf(", spoiled=%d", cp->spoiled);
1183 db_show_geom_provider(int indent, struct g_provider *pp)
1185 struct g_consumer *cp;
1189 gprintln("provider: %s (%p)", pp->name, pp);
1190 gprintln(" class: %s (%p)", pp->geom->class->name,
1192 gprintln(" geom: %s (%p)", pp->geom->name, pp->geom);
1193 gprintln(" mediasize: %jd", (intmax_t)pp->mediasize);
1194 gprintln(" sectorsize: %u", pp->sectorsize);
1195 gprintln(" stripesize: %u", pp->stripesize);
1196 gprintln(" stripeoffset: %u", pp->stripeoffset);
1197 gprintln(" access: r%dw%de%d", pp->acr, pp->acw,
1199 gprintln(" flags: %s (0x%04x)",
1200 provider_flags_to_string(pp, flags, sizeof(flags)),
1202 gprintln(" error: %d", pp->error);
1203 gprintln(" nstart: %u", pp->nstart);
1204 gprintln(" nend: %u", pp->nend);
1205 if (LIST_EMPTY(&pp->consumers))
1206 gprintln(" consumers: none");
1208 gprintf("provider: %s (%p), access=r%dw%de%d",
1209 pp->name, pp, pp->acr, pp->acw, pp->ace);
1210 if (pp->flags != 0) {
1211 db_printf(", flags=%s (0x%04x)",
1212 provider_flags_to_string(pp, flags, sizeof(flags)),
1217 if (!LIST_EMPTY(&pp->consumers)) {
1218 LIST_FOREACH(cp, &pp->consumers, consumers) {
1219 db_show_geom_consumer(indent + 2, cp);
1227 db_show_geom_geom(int indent, struct g_geom *gp)
1229 struct g_provider *pp;
1230 struct g_consumer *cp;
1234 gprintln("geom: %s (%p)", gp->name, gp);
1235 gprintln(" class: %s (%p)", gp->class->name, gp->class);
1236 gprintln(" flags: %s (0x%04x)",
1237 geom_flags_to_string(gp, flags, sizeof(flags)), gp->flags);
1238 gprintln(" rank: %d", gp->rank);
1239 if (LIST_EMPTY(&gp->provider))
1240 gprintln(" providers: none");
1241 if (LIST_EMPTY(&gp->consumer))
1242 gprintln(" consumers: none");
1244 gprintf("geom: %s (%p), rank=%d", gp->name, gp, gp->rank);
1245 if (gp->flags != 0) {
1246 db_printf(", flags=%s (0x%04x)",
1247 geom_flags_to_string(gp, flags, sizeof(flags)),
1252 if (!LIST_EMPTY(&gp->provider)) {
1253 LIST_FOREACH(pp, &gp->provider, provider) {
1254 db_show_geom_provider(indent + 2, pp);
1259 if (!LIST_EMPTY(&gp->consumer)) {
1260 LIST_FOREACH(cp, &gp->consumer, consumer) {
1261 db_show_geom_consumer(indent + 2, cp);
1269 db_show_geom_class(struct g_class *mp)
1273 db_printf("class: %s (%p)\n", mp->name, mp);
1274 LIST_FOREACH(gp, &mp->geom, geom) {
1275 db_show_geom_geom(2, gp);
1282 * Print the GEOM topology or the given object.
1284 DB_SHOW_COMMAND(geom, db_show_geom)
1289 /* No address given, print the entire topology. */
1290 LIST_FOREACH(mp, &g_classes, class) {
1291 db_show_geom_class(mp);
1297 switch (g_valid_obj((void *)addr)) {
1299 db_show_geom_class((struct g_class *)addr);
1302 db_show_geom_geom(0, (struct g_geom *)addr);
1305 db_show_geom_consumer(0, (struct g_consumer *)addr);
1308 db_show_geom_provider(0, (struct g_provider *)addr);
1311 db_printf("Not a GEOM object.\n");
1318 db_print_bio_cmd(struct bio *bp)
1320 db_printf(" cmd: ");
1321 switch (bp->bio_cmd) {
1322 case BIO_READ: db_printf("BIO_READ"); break;
1323 case BIO_WRITE: db_printf("BIO_WRITE"); break;
1324 case BIO_DELETE: db_printf("BIO_DELETE"); break;
1325 case BIO_GETATTR: db_printf("BIO_GETATTR"); break;
1326 case BIO_FLUSH: db_printf("BIO_FLUSH"); break;
1327 case BIO_CMD0: db_printf("BIO_CMD0"); break;
1328 case BIO_CMD1: db_printf("BIO_CMD1"); break;
1329 case BIO_CMD2: db_printf("BIO_CMD2"); break;
1330 default: db_printf("UNKNOWN"); break;
1336 db_print_bio_flags(struct bio *bp)
1341 db_printf(" flags: ");
1342 if (bp->bio_flags & BIO_ERROR) {
1343 db_printf("BIO_ERROR");
1346 if (bp->bio_flags & BIO_DONE) {
1347 db_printf("%sBIO_DONE", (comma ? ", " : ""));
1350 if (bp->bio_flags & BIO_ONQUEUE)
1351 db_printf("%sBIO_ONQUEUE", (comma ? ", " : ""));
1356 * Print useful information in a BIO
1358 DB_SHOW_COMMAND(bio, db_show_bio)
1363 bp = (struct bio *)addr;
1364 db_printf("BIO %p\n", bp);
1365 db_print_bio_cmd(bp);
1366 db_print_bio_flags(bp);
1367 db_printf(" cflags: 0x%hhx\n", bp->bio_cflags);
1368 db_printf(" pflags: 0x%hhx\n", bp->bio_pflags);
1369 db_printf(" offset: %jd\n", (intmax_t)bp->bio_offset);
1370 db_printf(" length: %jd\n", (intmax_t)bp->bio_length);
1371 db_printf(" bcount: %ld\n", bp->bio_bcount);
1372 db_printf(" resid: %ld\n", bp->bio_resid);
1373 db_printf(" completed: %jd\n", (intmax_t)bp->bio_completed);
1374 db_printf(" children: %u\n", bp->bio_children);
1375 db_printf(" inbed: %u\n", bp->bio_inbed);
1376 db_printf(" error: %d\n", bp->bio_error);
1377 db_printf(" parent: %p\n", bp->bio_parent);
1378 db_printf(" driver1: %p\n", bp->bio_driver1);
1379 db_printf(" driver2: %p\n", bp->bio_driver2);
1380 db_printf(" caller1: %p\n", bp->bio_caller1);
1381 db_printf(" caller2: %p\n", bp->bio_caller2);
1382 db_printf(" bio_from: %p\n", bp->bio_from);
1383 db_printf(" bio_to: %p\n", bp->bio_to);