The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_subr.c

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    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: stable/8/sys/geom/geom_subr.c 266035 2014-05-14 15:33:51Z bdrewery $");
   38 
   39 #include "opt_ddb.h"
   40 
   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>
   46 #include <sys/bio.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/proc.h>
   49 #include <sys/kthread.h>
   50 #include <sys/lock.h>
   51 #include <sys/mutex.h>
   52 #include <sys/errno.h>
   53 #include <sys/sbuf.h>
   54 #include <geom/geom.h>
   55 #include <geom/geom_int.h>
   56 #include <machine/stdarg.h>
   57 
   58 #ifdef DDB
   59 #include <ddb/ddb.h>
   60 #endif
   61 
   62 #ifdef KDB
   63 #include <sys/kdb.h>
   64 #endif
   65 
   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;
   69 
   70 struct g_hh00 {
   71         struct g_class  *mp;
   72         int             error;
   73         int             post;
   74 };
   75 
   76 /*
   77  * This event offers a new class a chance to taste all preexisting providers.
   78  */
   79 static void
   80 g_load_class(void *arg, int flag)
   81 {
   82         struct g_hh00 *hh;
   83         struct g_class *mp2, *mp;
   84         struct g_geom *gp;
   85         struct g_provider *pp;
   86 
   87         g_topology_assert();
   88         if (flag == EV_CANCEL)  /* XXX: can't happen ? */
   89                 return;
   90         if (g_shutdown)
   91                 return;
   92 
   93         hh = arg;
   94         mp = hh->mp;
   95         hh->error = 0;
   96         if (hh->post) {
   97                 g_free(hh);
   98                 hh = NULL;
   99         }
  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) {
  104                 if (mp2 == mp) {
  105                         printf("The GEOM class %s is already loaded.\n",
  106                             mp2->name);
  107                         if (hh != NULL)
  108                                 hh->error = EEXIST;
  109                         return;
  110                 } else if (strcmp(mp2->name, mp->name) == 0) {
  111                         printf("A GEOM class %s is already loaded.\n",
  112                             mp2->name);
  113                         if (hh != NULL)
  114                                 hh->error = EEXIST;
  115                         return;
  116                 }
  117         }
  118 
  119         LIST_INIT(&mp->geom);
  120         LIST_INSERT_HEAD(&g_classes, mp, class);
  121         if (mp->init != NULL)
  122                 mp->init(mp);
  123         if (mp->taste == NULL)
  124                 return;
  125         LIST_FOREACH(mp2, &g_classes, class) {
  126                 if (mp == mp2)
  127                         continue;
  128                 LIST_FOREACH(gp, &mp2->geom, geom) {
  129                         LIST_FOREACH(pp, &gp->provider, provider) {
  130                                 mp->taste(mp, pp, 0);
  131                                 g_topology_assert();
  132                         }
  133                 }
  134         }
  135 }
  136 
  137 static int
  138 g_unload_class(struct g_class *mp)
  139 {
  140         struct g_geom *gp;
  141         struct g_provider *pp;
  142         struct g_consumer *cp;
  143         int error;
  144 
  145         g_topology_lock();
  146         g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name);
  147 retry:
  148         G_VALID_CLASS(mp);
  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) {
  153                                 g_topology_unlock();
  154                                 return (EBUSY);
  155                         }
  156                 LIST_FOREACH(cp, &gp->consumer, consumer)
  157                         if (cp->acr || cp->acw || cp->ace) {
  158                                 g_topology_unlock();
  159                                 return (EBUSY);
  160                         }
  161                 /* If the geom is withering, wait for it to finish. */
  162                 if (gp->flags & G_GEOM_WITHER) {
  163                         g_topology_sleep(mp, 1);
  164                         goto retry;
  165                 }
  166         }
  167 
  168         /*
  169          * We allow unloading if we have no geoms, or a class
  170          * method we can use to get rid of them.
  171          */
  172         if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) {
  173                 g_topology_unlock();
  174                 return (EOPNOTSUPP);
  175         }
  176 
  177         /* Bar new entries */
  178         mp->taste = NULL;
  179         mp->config = NULL;
  180 
  181         LIST_FOREACH(gp, &mp->geom, geom) {
  182                 error = mp->destroy_geom(NULL, mp, gp);
  183                 if (error != 0) {
  184                         g_topology_unlock();
  185                         return (error);
  186                 }
  187         }
  188         /* Wait for withering to finish. */
  189         for (;;) {
  190                 gp = LIST_FIRST(&mp->geom);
  191                 if (gp == NULL)
  192                         break;
  193                 KASSERT(gp->flags & G_GEOM_WITHER,
  194                    ("Non-withering geom in class %s", mp->name));
  195                 g_topology_sleep(mp, 1);
  196         }
  197         G_VALID_CLASS(mp);
  198         if (mp->fini != NULL)
  199                 mp->fini(mp);
  200         LIST_REMOVE(mp, class);
  201         g_topology_unlock();
  202 
  203         return (0);
  204 }
  205 
  206 int
  207 g_modevent(module_t mod, int type, void *data)
  208 {
  209         struct g_hh00 *hh;
  210         int error;
  211         static int g_ignition;
  212         struct g_class *mp;
  213 
  214         mp = data;
  215         if (mp->version != G_VERSION) {
  216                 printf("GEOM class %s has Wrong version %x\n",
  217                     mp->name, mp->version);
  218                 return (EINVAL);
  219         }
  220         if (!g_ignition) {
  221                 g_ignition++;
  222                 g_init();
  223         }
  224         error = EOPNOTSUPP;
  225         switch (type) {
  226         case MOD_LOAD:
  227                 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", mp->name);
  228                 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
  229                 hh->mp = mp;
  230                 /*
  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.
  234                  */
  235                 if (cold) {
  236                         hh->post = 1;
  237                         error = g_post_event(g_load_class, hh, M_WAITOK, NULL);
  238                 } else {
  239                         error = g_waitfor_event(g_load_class, hh, M_WAITOK,
  240                             NULL);
  241                         if (error == 0)
  242                                 error = hh->error;
  243                         g_free(hh);
  244                 }
  245                 break;
  246         case MOD_UNLOAD:
  247                 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", mp->name);
  248                 DROP_GIANT();
  249                 error = g_unload_class(mp);
  250                 PICKUP_GIANT();
  251                 if (error == 0) {
  252                         KASSERT(LIST_EMPTY(&mp->geom),
  253                             ("Unloaded class (%s) still has geom", mp->name));
  254                 }
  255                 break;
  256         }
  257         return (error);
  258 }
  259 
  260 static void
  261 g_retaste_event(void *arg, int flag)
  262 {
  263         struct g_class *cp, *mp;
  264         struct g_geom *gp, *gp2;
  265         struct g_hh00 *hh;
  266         struct g_provider *pp;
  267 
  268         g_topology_assert();
  269         if (flag == EV_CANCEL)  /* XXX: can't happen ? */
  270                 return;
  271         if (g_shutdown)
  272                 return;
  273 
  274         hh = arg;
  275         mp = hh->mp;
  276         hh->error = 0;
  277         if (hh->post) {
  278                 g_free(hh);
  279                 hh = NULL;
  280         }
  281         g_trace(G_T_TOPOLOGY, "g_retaste(%s)", mp->name);
  282 
  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)
  287                                         continue;
  288                                 LIST_FOREACH(gp2, &mp->geom, geom) {
  289                                         if (!strcmp(pp->name, gp2->name))
  290                                                 break;
  291                                 }
  292                                 if (gp2 != NULL)
  293                                         g_wither_geom(gp2, ENXIO);
  294                                 mp->taste(mp, pp, 0);
  295                                 g_topology_assert();
  296                         }
  297                 }
  298         }
  299 }
  300 
  301 int
  302 g_retaste(struct g_class *mp)
  303 {
  304         struct g_hh00 *hh;
  305         int error;
  306 
  307         if (mp->taste == NULL)
  308                 return (EINVAL);
  309 
  310         hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
  311         hh->mp = mp;
  312 
  313         if (cold) {
  314                 hh->post = 1;
  315                 error = g_post_event(g_retaste_event, hh, M_WAITOK, NULL);
  316         } else {
  317                 error = g_waitfor_event(g_retaste_event, hh, M_WAITOK, NULL);
  318                 if (error == 0)
  319                         error = hh->error;
  320                 g_free(hh);
  321         }
  322 
  323         return (error);
  324 }
  325 
  326 struct g_geom *
  327 g_new_geomf(struct g_class *mp, const char *fmt, ...)
  328 {
  329         struct g_geom *gp;
  330         va_list ap;
  331         struct sbuf *sb;
  332 
  333         g_topology_assert();
  334         G_VALID_CLASS(mp);
  335         sb = sbuf_new_auto();
  336         va_start(ap, fmt);
  337         sbuf_vprintf(sb, fmt, ap);
  338         va_end(ap);
  339         sbuf_finish(sb);
  340         gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO);
  341         gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
  342         gp->class = mp;
  343         gp->rank = 1;
  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));
  349         sbuf_delete(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;
  357         return (gp);
  358 }
  359 
  360 void
  361 g_destroy_geom(struct g_geom *gp)
  362 {
  363 
  364         g_topology_assert();
  365         G_VALID_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)));
  373         g_cancel_event(gp);
  374         LIST_REMOVE(gp, geom);
  375         TAILQ_REMOVE(&geoms, gp, geoms);
  376         g_free(gp->name);
  377         g_free(gp);
  378 }
  379 
  380 /*
  381  * This function is called (repeatedly) until the geom has withered away.
  382  */
  383 void
  384 g_wither_geom(struct g_geom *gp, int error)
  385 {
  386         struct g_provider *pp;
  387 
  388         g_topology_assert();
  389         G_VALID_GEOM(gp);
  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);
  396         }
  397         g_do_wither();
  398 }
  399 
  400 /*
  401  * Convenience function to destroy a particular provider.
  402  */
  403 void
  404 g_wither_provider(struct g_provider *pp, int error)
  405 {
  406 
  407         pp->flags |= G_PF_WITHER;
  408         if (!(pp->flags & G_PF_ORPHAN))
  409                 g_orphan_provider(pp, error);
  410 }
  411 
  412 /*
  413  * This function is called (repeatedly) until the has withered away.
  414  */
  415 void
  416 g_wither_geom_close(struct g_geom *gp, int error)
  417 {
  418         struct g_consumer *cp;
  419 
  420         g_topology_assert();
  421         G_VALID_GEOM(gp);
  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);
  427 }
  428 
  429 /*
  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.
  434  */
  435 int
  436 g_wither_washer()
  437 {
  438         struct g_class *mp;
  439         struct g_geom *gp, *gp2;
  440         struct g_provider *pp, *pp2;
  441         struct g_consumer *cp, *cp2;
  442         int result;
  443 
  444         result = 0;
  445         g_topology_assert();
  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))
  450                                         continue;
  451                                 if (LIST_EMPTY(&pp->consumers))
  452                                         g_destroy_provider(pp);
  453                                 else
  454                                         result |= 1;
  455                         }
  456                         if (!(gp->flags & G_GEOM_WITHER))
  457                                 continue;
  458                         LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
  459                                 if (LIST_EMPTY(&pp->consumers))
  460                                         g_destroy_provider(pp);
  461                                 else
  462                                         result |= 1;
  463                         }
  464                         LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) {
  465                                 if (cp->acr || cp->acw || cp->ace) {
  466                                         result |= 1;
  467                                         continue;
  468                                 }
  469                                 if (cp->provider != NULL)
  470                                         g_detach(cp);
  471                                 g_destroy_consumer(cp);
  472                                 result |= 2;
  473                         }
  474                         if (LIST_EMPTY(&gp->provider) &&
  475                             LIST_EMPTY(&gp->consumer))
  476                                 g_destroy_geom(gp);
  477                         else
  478                                 result |= 1;
  479                 }
  480         }
  481         return (result);
  482 }
  483 
  484 struct g_consumer *
  485 g_new_consumer(struct g_geom *gp)
  486 {
  487         struct g_consumer *cp;
  488 
  489         g_topology_assert();
  490         G_VALID_GEOM(gp);
  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));
  497 
  498         cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO);
  499         cp->geom = gp;
  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);
  503         return(cp);
  504 }
  505 
  506 void
  507 g_destroy_consumer(struct g_consumer *cp)
  508 {
  509         struct g_geom *gp;
  510 
  511         g_topology_assert();
  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"));
  518         g_cancel_event(cp);
  519         gp = cp->geom;
  520         LIST_REMOVE(cp, consumer);
  521         devstat_remove_entry(cp->stat);
  522         g_free(cp);
  523         if (gp->flags & G_GEOM_WITHER)
  524                 g_do_wither();
  525 }
  526 
  527 static void
  528 g_new_provider_event(void *arg, int flag)
  529 {
  530         struct g_class *mp;
  531         struct g_provider *pp;
  532         struct g_consumer *cp;
  533 
  534         g_topology_assert();
  535         if (flag == EV_CANCEL)
  536                 return;
  537         if (g_shutdown)
  538                 return;
  539         pp = arg;
  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)
  545                         continue;
  546                 LIST_FOREACH(cp, &pp->consumers, consumers)
  547                         if (cp->geom->class == mp)
  548                                 break;
  549                 if (cp != NULL)
  550                         continue;
  551                 mp->taste(mp, pp, 0);
  552                 g_topology_assert();
  553         }
  554 }
  555 
  556 
  557 struct g_provider *
  558 g_new_providerf(struct g_geom *gp, const char *fmt, ...)
  559 {
  560         struct g_provider *pp;
  561         struct sbuf *sb;
  562         va_list ap;
  563 
  564         g_topology_assert();
  565         G_VALID_GEOM(gp);
  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();
  576         va_start(ap, fmt);
  577         sbuf_vprintf(sb, fmt, ap);
  578         va_end(ap);
  579         sbuf_finish(sb);
  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));
  583         sbuf_delete(sb);
  584         LIST_INIT(&pp->consumers);
  585         pp->error = ENXIO;
  586         pp->geom = gp;
  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);
  591         return (pp);
  592 }
  593 
  594 void
  595 g_error_provider(struct g_provider *pp, int error)
  596 {
  597 
  598         /* G_VALID_PROVIDER(pp);  We may not have g_topology */
  599         pp->error = error;
  600 }
  601 
  602 #ifndef _PATH_DEV
  603 #define _PATH_DEV       "/dev/"
  604 #endif
  605 
  606 struct g_provider *
  607 g_provider_by_name(char const *arg)
  608 {
  609         struct g_class *cp;
  610         struct g_geom *gp;
  611         struct g_provider *pp;
  612 
  613         if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
  614                 arg += sizeof(_PATH_DEV) - 1;
  615 
  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))
  620                                         return (pp);
  621                         }
  622                 }
  623         }
  624 
  625         return (NULL);
  626 }
  627 
  628 void
  629 g_destroy_provider(struct g_provider *pp)
  630 {
  631         struct g_geom *gp;
  632 
  633         g_topology_assert();
  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"));
  640         g_cancel_event(pp);
  641         LIST_REMOVE(pp, provider);
  642         gp = pp->geom;
  643         devstat_remove_entry(pp->stat);
  644         g_free(pp);
  645         if ((gp->flags & G_GEOM_WITHER))
  646                 g_do_wither();
  647 }
  648 
  649 /*
  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.
  664  */
  665 
  666 static int
  667 redo_rank(struct g_geom *gp)
  668 {
  669         struct g_consumer *cp;
  670         struct g_geom *gp1, *gp2;
  671         int n, m;
  672 
  673         g_topology_assert();
  674         G_VALID_GEOM(gp);
  675 
  676         /* Invalidate this geoms rank and move it to the tail */
  677         gp1 = TAILQ_NEXT(gp, geoms);
  678         if (gp1 != NULL) {
  679                 gp->rank = 0;
  680                 TAILQ_REMOVE(&geoms, gp, geoms);
  681                 TAILQ_INSERT_TAIL(&geoms, gp, geoms);
  682         } else {
  683                 gp1 = gp;
  684         }
  685 
  686         /* re-rank the rest of the sequence */
  687         for (; gp1 != NULL; gp1 = gp2) {
  688                 gp1->rank = 0;
  689                 m = 1;
  690                 LIST_FOREACH(cp, &gp1->consumer, consumer) {
  691                         if (cp->provider == NULL)
  692                                 continue;
  693                         n = cp->provider->geom->rank;
  694                         if (n == 0) {
  695                                 m = 0;
  696                                 break;
  697                         } else if (n >= m)
  698                                 m = n + 1;
  699                 }
  700                 gp1->rank = m;
  701                 gp2 = TAILQ_NEXT(gp1, geoms);
  702 
  703                 /* got a rank, moving on */
  704                 if (m != 0)
  705                         continue;
  706 
  707                 /* no rank to original geom means loop */
  708                 if (gp == gp1) 
  709                         return (ELOOP);
  710 
  711                 /* no rank, put it at the end move on */
  712                 TAILQ_REMOVE(&geoms, gp1, geoms);
  713                 TAILQ_INSERT_TAIL(&geoms, gp1, geoms);
  714         }
  715         return (0);
  716 }
  717 
  718 int
  719 g_attach(struct g_consumer *cp, struct g_provider *pp)
  720 {
  721         int error;
  722 
  723         g_topology_assert();
  724         G_VALID_CONSUMER(cp);
  725         G_VALID_PROVIDER(pp);
  726         KASSERT(cp->provider == NULL, ("attach but attached"));
  727         cp->provider = pp;
  728         LIST_INSERT_HEAD(&pp->consumers, cp, consumers);
  729         error = redo_rank(cp->geom);
  730         if (error) {
  731                 LIST_REMOVE(cp, consumers);
  732                 cp->provider = NULL;
  733                 redo_rank(cp->geom);
  734         }
  735         return (error);
  736 }
  737 
  738 void
  739 g_detach(struct g_consumer *cp)
  740 {
  741         struct g_provider *pp;
  742 
  743         g_topology_assert();
  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"));
  752         pp = cp->provider;
  753         LIST_REMOVE(cp, consumers);
  754         cp->provider = NULL;
  755         if (pp->geom->flags & G_GEOM_WITHER)
  756                 g_do_wither();
  757         else if (pp->flags & G_PF_WITHER)
  758                 g_do_wither();
  759         redo_rank(cp->geom);
  760 }
  761 
  762 /*
  763  * g_access()
  764  *
  765  * Access-check with delta values.  The question asked is "can provider
  766  * "cp" change the access counters by the relative amounts dc[rwe] ?"
  767  */
  768 
  769 int
  770 g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
  771 {
  772         struct g_provider *pp;
  773         int pr,pw,pe;
  774         int error;
  775 
  776         g_topology_assert();
  777         G_VALID_CONSUMER(cp);
  778         pp = cp->provider;
  779         KASSERT(pp != NULL, ("access but not attached"));
  780         G_VALID_PROVIDER(pp);
  781 
  782         g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
  783             cp, pp->name, dcr, dcw, dce);
  784 
  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"));
  790 
  791         /*
  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.
  795          */
  796         if (cp->geom->spoiled != NULL && cp->spoiled &&
  797             (dcr > 0 || dcw > 0 || dce > 0))
  798                 return (ENXIO);
  799 
  800         /*
  801          * Figure out what counts the provider would have had, if this
  802          * consumer had (r0w0e0) at this time.
  803          */
  804         pr = pp->acr - cp->acr;
  805         pw = pp->acw - cp->acw;
  806         pe = pp->ace - cp->ace;
  807 
  808         g_trace(G_T_ACCESS,
  809     "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)",
  810             dcr, dcw, dce,
  811             cp->acr, cp->acw, cp->ace,
  812             pp->acr, pp->acw, pp->ace,
  813             pp, pp->name);
  814 
  815         /* If foot-shooting is enabled, any open on rank#1 is OK */
  816         if ((g_debugflags & 16) && pp->geom->rank == 1)
  817                 ;
  818         /* If we try exclusive but already write: fail */
  819         else if (dce > 0 && pw > 0)
  820                 return (EPERM);
  821         /* If we try write but already exclusive: fail */
  822         else if (dcw > 0 && pe > 0)
  823                 return (EPERM);
  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)
  826                 return (pp->error);
  827 
  828         /* Ok then... */
  829 
  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,
  834             dce, error));
  835         if (!error) {
  836                 /*
  837                  * If we open first write, spoil any partner consumers.
  838                  * If we close last write and provider is not errored,
  839                  * trigger re-taste.
  840                  */
  841                 if (pp->acw == 0 && dcw != 0)
  842                         g_spoil(pp, cp);
  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, 
  846                             pp, NULL);
  847 
  848                 pp->acr += dcr;
  849                 pp->acw += dcw;
  850                 pp->ace += dce;
  851                 cp->acr += dcr;
  852                 cp->acw += dcw;
  853                 cp->ace += dce;
  854                 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)
  855                         KASSERT(pp->sectorsize > 0,
  856                             ("Provider %s lacks sectorsize", pp->name));
  857         }
  858         return (error);
  859 }
  860 
  861 int
  862 g_handleattr_int(struct bio *bp, const char *attribute, int val)
  863 {
  864 
  865         return (g_handleattr(bp, attribute, &val, sizeof val));
  866 }
  867 
  868 int
  869 g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val)
  870 {
  871 
  872         return (g_handleattr(bp, attribute, &val, sizeof val));
  873 }
  874 
  875 int
  876 g_handleattr_str(struct bio *bp, const char *attribute, const char *str)
  877 {
  878 
  879         return (g_handleattr(bp, attribute, str, 0));
  880 }
  881 
  882 int
  883 g_handleattr(struct bio *bp, const char *attribute, const void *val, int len)
  884 {
  885         int error = 0;
  886 
  887         if (strcmp(bp->bio_attribute, attribute))
  888                 return (0);
  889         if (len == 0) {
  890                 bzero(bp->bio_data, bp->bio_length);
  891                 if (strlcpy(bp->bio_data, val, bp->bio_length) >=
  892                     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));
  896                         error = EFAULT;
  897                 }
  898         } else if (bp->bio_length == len) {
  899                 bcopy(val, bp->bio_data, len);
  900         } else {
  901                 printf("%s: %s bio_length %jd len %d -> EFAULT\n", __func__,
  902                     bp->bio_to->name, (intmax_t)bp->bio_length, len);
  903                 error = EFAULT;
  904         }
  905         if (error == 0)
  906                 bp->bio_completed = bp->bio_length;
  907         g_io_deliver(bp, error);
  908         return (1);
  909 }
  910 
  911 int
  912 g_std_access(struct g_provider *pp,
  913         int dr __unused, int dw __unused, int de __unused)
  914 {
  915 
  916         g_topology_assert();
  917         G_VALID_PROVIDER(pp);
  918         return (0);
  919 }
  920 
  921 void
  922 g_std_done(struct bio *bp)
  923 {
  924         struct bio *bp2;
  925 
  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;
  930         g_destroy_bio(bp);
  931         bp2->bio_inbed++;
  932         if (bp2->bio_children == bp2->bio_inbed)
  933                 g_io_deliver(bp2, bp2->bio_error);
  934 }
  935 
  936 /* XXX: maybe this is only g_slice_spoiled */
  937 
  938 void
  939 g_std_spoiled(struct g_consumer *cp)
  940 {
  941         struct g_geom *gp;
  942         struct g_provider *pp;
  943 
  944         g_topology_assert();
  945         G_VALID_CONSUMER(cp);
  946         g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
  947         g_detach(cp);
  948         gp = cp->geom;
  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))
  953                 g_destroy_geom(gp);
  954         else
  955                 gp->flags |= G_GEOM_WITHER;
  956 }
  957 
  958 /*
  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.
  967  */
  968 
  969 static void
  970 g_spoil_event(void *arg, int flag)
  971 {
  972         struct g_provider *pp;
  973         struct g_consumer *cp, *cp2;
  974 
  975         g_topology_assert();
  976         if (flag == EV_CANCEL)
  977                 return;
  978         pp = arg;
  979         G_VALID_PROVIDER(pp);
  980         for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) {
  981                 cp2 = LIST_NEXT(cp, consumers);
  982                 if (!cp->spoiled)
  983                         continue;
  984                 cp->spoiled = 0;
  985                 if (cp->geom->spoiled == NULL)
  986                         continue;
  987                 cp->geom->spoiled(cp);
  988                 g_topology_assert();
  989         }
  990 }
  991 
  992 void
  993 g_spoil(struct g_provider *pp, struct g_consumer *cp)
  994 {
  995         struct g_consumer *cp2;
  996 
  997         g_topology_assert();
  998         G_VALID_PROVIDER(pp);
  999         G_VALID_CONSUMER(cp);
 1000 
 1001         LIST_FOREACH(cp2, &pp->consumers, consumers) {
 1002                 if (cp2 == cp)
 1003                         continue;
 1004 /*
 1005                 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr));
 1006                 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw));
 1007 */
 1008                 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace));
 1009                 cp2->spoiled++;
 1010         }
 1011         g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL);
 1012 }
 1013 
 1014 int
 1015 g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
 1016 {
 1017         int error, i;
 1018 
 1019         i = len;
 1020         error = g_io_getattr(attr, cp, &i, var);
 1021         if (error)
 1022                 return (error);
 1023         if (i != len)
 1024                 return (EINVAL);
 1025         return (0);
 1026 }
 1027 
 1028 static int
 1029 g_get_device_prefix_len(const char *name)
 1030 {
 1031         int len;
 1032 
 1033         if (strncmp(name, "ada", 3) == 0)
 1034                 len = 3;
 1035         else if (strncmp(name, "ad", 2) == 0)
 1036                 len = 2;
 1037         else
 1038                 return (0);
 1039         if (name[len] < '' || name[len] > '9')
 1040                 return (0);
 1041         do {
 1042                 len++;
 1043         } while (name[len] >= '' && name[len] <= '9');
 1044         return (len);
 1045 }
 1046 
 1047 int
 1048 g_compare_names(const char *namea, const char *nameb)
 1049 {
 1050         int deva, devb;
 1051 
 1052         if (strcmp(namea, nameb) == 0)
 1053                 return (1);
 1054         deva = g_get_device_prefix_len(namea);
 1055         if (deva == 0)
 1056                 return (0);
 1057         devb = g_get_device_prefix_len(nameb);
 1058         if (devb == 0)
 1059                 return (0);
 1060         if (strcmp(namea + deva, nameb + devb) == 0)
 1061                 return (1);
 1062         return (0);
 1063 }
 1064 
 1065 #if defined(DIAGNOSTIC) || defined(DDB)
 1066 /*
 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.
 1072  */
 1073 int
 1074 g_valid_obj(void const *ptr)
 1075 {
 1076         struct g_class *mp;
 1077         struct g_geom *gp;
 1078         struct g_consumer *cp;
 1079         struct g_provider *pp;
 1080 
 1081 #ifdef KDB
 1082         if (kdb_active == 0)
 1083 #endif
 1084                 g_topology_assert();
 1085 
 1086         LIST_FOREACH(mp, &g_classes, class) {
 1087                 if (ptr == mp)
 1088                         return (1);
 1089                 LIST_FOREACH(gp, &mp->geom, geom) {
 1090                         if (ptr == gp)
 1091                                 return (2);
 1092                         LIST_FOREACH(cp, &gp->consumer, consumer)
 1093                                 if (ptr == cp)
 1094                                         return (3);
 1095                         LIST_FOREACH(pp, &gp->provider, provider)
 1096                                 if (ptr == pp)
 1097                                         return (4);
 1098                 }
 1099         }
 1100         return(0);
 1101 }
 1102 #endif
 1103 
 1104 #ifdef DDB
 1105 
 1106 #define gprintf(...)    do {                                            \
 1107         db_printf("%*s", indent, "");                                   \
 1108         db_printf(__VA_ARGS__);                                         \
 1109 } while (0)
 1110 #define gprintln(...)   do {                                            \
 1111         gprintf(__VA_ARGS__);                                           \
 1112         db_printf("\n");                                                \
 1113 } while (0)
 1114 
 1115 #define ADDFLAG(obj, flag, sflag)       do {                            \
 1116         if ((obj)->flags & (flag)) {                                    \
 1117                 if (comma)                                              \
 1118                         strlcat(str, ",", size);                        \
 1119                 strlcat(str, (sflag), size);                            \
 1120                 comma = 1;                                              \
 1121         }                                                               \
 1122 } while (0)
 1123 
 1124 static char *
 1125 provider_flags_to_string(struct g_provider *pp, char *str, size_t size)
 1126 {
 1127         int comma = 0;
 1128 
 1129         bzero(str, size);
 1130         if (pp->flags == 0) {
 1131                 strlcpy(str, "NONE", size);
 1132                 return (str);
 1133         }
 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");
 1137         return (str);
 1138 }
 1139 
 1140 static char *
 1141 geom_flags_to_string(struct g_geom *gp, char *str, size_t size)
 1142 {
 1143         int comma = 0;
 1144 
 1145         bzero(str, size);
 1146         if (gp->flags == 0) {
 1147                 strlcpy(str, "NONE", size);
 1148                 return (str);
 1149         }
 1150         ADDFLAG(gp, G_GEOM_WITHER, "G_GEOM_WITHER");
 1151         return (str);
 1152 }
 1153 static void
 1154 db_show_geom_consumer(int indent, struct g_consumer *cp)
 1155 {
 1156 
 1157         if (indent == 0) {
 1158                 gprintln("consumer: %p", cp);
 1159                 gprintln("  class:    %s (%p)", cp->geom->class->name,
 1160                     cp->geom->class);
 1161                 gprintln("  geom:     %s (%p)", cp->geom->name, cp->geom);
 1162                 if (cp->provider == NULL)
 1163                         gprintln("  provider: none");
 1164                 else {
 1165                         gprintln("  provider: %s (%p)", cp->provider->name,
 1166                             cp->provider);
 1167                 }
 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);
 1172         } else {
 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);
 1176                 if (cp->spoiled)
 1177                         db_printf(", spoiled=%d", cp->spoiled);
 1178                 db_printf("\n");
 1179         }
 1180 }
 1181 
 1182 static void
 1183 db_show_geom_provider(int indent, struct g_provider *pp)
 1184 {
 1185         struct g_consumer *cp;
 1186         char flags[64];
 1187 
 1188         if (indent == 0) {
 1189                 gprintln("provider: %s (%p)", pp->name, pp);
 1190                 gprintln("  class:        %s (%p)", pp->geom->class->name,
 1191                     pp->geom->class);
 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,
 1198                     pp->ace);
 1199                 gprintln("  flags:        %s (0x%04x)",
 1200                     provider_flags_to_string(pp, flags, sizeof(flags)),
 1201                     pp->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");
 1207         } else {
 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)),
 1213                             pp->flags);
 1214                 }
 1215                 db_printf("\n");
 1216         }
 1217         if (!LIST_EMPTY(&pp->consumers)) {
 1218                 LIST_FOREACH(cp, &pp->consumers, consumers) {
 1219                         db_show_geom_consumer(indent + 2, cp);
 1220                         if (db_pager_quit)
 1221                                 break;
 1222                 }
 1223         }
 1224 }
 1225 
 1226 static void
 1227 db_show_geom_geom(int indent, struct g_geom *gp)
 1228 {
 1229         struct g_provider *pp;
 1230         struct g_consumer *cp;
 1231         char flags[64];
 1232 
 1233         if (indent == 0) {
 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");
 1243         } else {
 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)),
 1248                             gp->flags);
 1249                 }
 1250                 db_printf("\n");
 1251         }
 1252         if (!LIST_EMPTY(&gp->provider)) {
 1253                 LIST_FOREACH(pp, &gp->provider, provider) {
 1254                         db_show_geom_provider(indent + 2, pp);
 1255                         if (db_pager_quit)
 1256                                 break;
 1257                 }
 1258         }
 1259         if (!LIST_EMPTY(&gp->consumer)) {
 1260                 LIST_FOREACH(cp, &gp->consumer, consumer) {
 1261                         db_show_geom_consumer(indent + 2, cp);
 1262                         if (db_pager_quit)
 1263                                 break;
 1264                 }
 1265         }
 1266 }
 1267 
 1268 static void
 1269 db_show_geom_class(struct g_class *mp)
 1270 {
 1271         struct g_geom *gp;
 1272 
 1273         db_printf("class: %s (%p)\n", mp->name, mp);
 1274         LIST_FOREACH(gp, &mp->geom, geom) {
 1275                 db_show_geom_geom(2, gp);
 1276                 if (db_pager_quit)
 1277                         break;
 1278         }
 1279 }
 1280 
 1281 /*
 1282  * Print the GEOM topology or the given object.
 1283  */
 1284 DB_SHOW_COMMAND(geom, db_show_geom)
 1285 {
 1286         struct g_class *mp;
 1287 
 1288         if (!have_addr) {
 1289                 /* No address given, print the entire topology. */
 1290                 LIST_FOREACH(mp, &g_classes, class) {
 1291                         db_show_geom_class(mp);
 1292                         db_printf("\n");
 1293                         if (db_pager_quit)
 1294                                 break;
 1295                 }
 1296         } else {
 1297                 switch (g_valid_obj((void *)addr)) {
 1298                 case 1:
 1299                         db_show_geom_class((struct g_class *)addr);
 1300                         break;
 1301                 case 2:
 1302                         db_show_geom_geom(0, (struct g_geom *)addr);
 1303                         break;
 1304                 case 3:
 1305                         db_show_geom_consumer(0, (struct g_consumer *)addr);
 1306                         break;
 1307                 case 4:
 1308                         db_show_geom_provider(0, (struct g_provider *)addr);
 1309                         break;
 1310                 default:
 1311                         db_printf("Not a GEOM object.\n");
 1312                         break;
 1313                 }
 1314         }
 1315 }
 1316 
 1317 static void
 1318 db_print_bio_cmd(struct bio *bp)
 1319 {
 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;
 1331         }
 1332         db_printf("\n");
 1333 }
 1334 
 1335 static void
 1336 db_print_bio_flags(struct bio *bp)
 1337 {
 1338         int comma;
 1339 
 1340         comma = 0;
 1341         db_printf("  flags: ");
 1342         if (bp->bio_flags & BIO_ERROR) {
 1343                 db_printf("BIO_ERROR");
 1344                 comma = 1;
 1345         }
 1346         if (bp->bio_flags & BIO_DONE) {
 1347                 db_printf("%sBIO_DONE", (comma ? ", " : ""));
 1348                 comma = 1;
 1349         }
 1350         if (bp->bio_flags & BIO_ONQUEUE)
 1351                 db_printf("%sBIO_ONQUEUE", (comma ? ", " : ""));
 1352         db_printf("\n");
 1353 }
 1354 
 1355 /*
 1356  * Print useful information in a BIO
 1357  */
 1358 DB_SHOW_COMMAND(bio, db_show_bio)
 1359 {
 1360         struct bio *bp;
 1361 
 1362         if (have_addr) {
 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);
 1384         }
 1385 }
 1386 
 1387 #undef  gprintf
 1388 #undef  gprintln
 1389 #undef  ADDFLAG
 1390 
 1391 #endif  /* DDB */

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