The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: releng/11.2/sys/geom/geom_subr.c 332095 2018-04-06 12:13:32Z avg $");
   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         struct g_provider       *pp;
   73         off_t                   size;
   74         int                     error;
   75         int                     post;
   76 };
   77 
   78 /*
   79  * This event offers a new class a chance to taste all preexisting providers.
   80  */
   81 static void
   82 g_load_class(void *arg, int flag)
   83 {
   84         struct g_hh00 *hh;
   85         struct g_class *mp2, *mp;
   86         struct g_geom *gp;
   87         struct g_provider *pp;
   88 
   89         g_topology_assert();
   90         if (flag == EV_CANCEL)  /* XXX: can't happen ? */
   91                 return;
   92         if (g_shutdown)
   93                 return;
   94 
   95         hh = arg;
   96         mp = hh->mp;
   97         hh->error = 0;
   98         if (hh->post) {
   99                 g_free(hh);
  100                 hh = NULL;
  101         }
  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) {
  106                 if (mp2 == mp) {
  107                         printf("The GEOM class %s is already loaded.\n",
  108                             mp2->name);
  109                         if (hh != NULL)
  110                                 hh->error = EEXIST;
  111                         return;
  112                 } else if (strcmp(mp2->name, mp->name) == 0) {
  113                         printf("A GEOM class %s is already loaded.\n",
  114                             mp2->name);
  115                         if (hh != NULL)
  116                                 hh->error = EEXIST;
  117                         return;
  118                 }
  119         }
  120 
  121         LIST_INIT(&mp->geom);
  122         LIST_INSERT_HEAD(&g_classes, mp, class);
  123         if (mp->init != NULL)
  124                 mp->init(mp);
  125         if (mp->taste == NULL)
  126                 return;
  127         LIST_FOREACH(mp2, &g_classes, class) {
  128                 if (mp == mp2)
  129                         continue;
  130                 LIST_FOREACH(gp, &mp2->geom, geom) {
  131                         LIST_FOREACH(pp, &gp->provider, provider) {
  132                                 mp->taste(mp, pp, 0);
  133                                 g_topology_assert();
  134                         }
  135                 }
  136         }
  137 }
  138 
  139 static int
  140 g_unload_class(struct g_class *mp)
  141 {
  142         struct g_geom *gp;
  143         struct g_provider *pp;
  144         struct g_consumer *cp;
  145         int error;
  146 
  147         g_topology_lock();
  148         g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name);
  149 retry:
  150         G_VALID_CLASS(mp);
  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) {
  155                                 g_topology_unlock();
  156                                 return (EBUSY);
  157                         }
  158                 LIST_FOREACH(cp, &gp->consumer, consumer)
  159                         if (cp->acr || cp->acw || cp->ace) {
  160                                 g_topology_unlock();
  161                                 return (EBUSY);
  162                         }
  163                 /* If the geom is withering, wait for it to finish. */
  164                 if (gp->flags & G_GEOM_WITHER) {
  165                         g_topology_sleep(mp, 1);
  166                         goto retry;
  167                 }
  168         }
  169 
  170         /*
  171          * We allow unloading if we have no geoms, or a class
  172          * method we can use to get rid of them.
  173          */
  174         if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) {
  175                 g_topology_unlock();
  176                 return (EOPNOTSUPP);
  177         }
  178 
  179         /* Bar new entries */
  180         mp->taste = NULL;
  181         mp->config = NULL;
  182 
  183         LIST_FOREACH(gp, &mp->geom, geom) {
  184                 error = mp->destroy_geom(NULL, mp, gp);
  185                 if (error != 0) {
  186                         g_topology_unlock();
  187                         return (error);
  188                 }
  189         }
  190         /* Wait for withering to finish. */
  191         for (;;) {
  192                 gp = LIST_FIRST(&mp->geom);
  193                 if (gp == NULL)
  194                         break;
  195                 KASSERT(gp->flags & G_GEOM_WITHER,
  196                    ("Non-withering geom in class %s", mp->name));
  197                 g_topology_sleep(mp, 1);
  198         }
  199         G_VALID_CLASS(mp);
  200         if (mp->fini != NULL)
  201                 mp->fini(mp);
  202         LIST_REMOVE(mp, class);
  203         g_topology_unlock();
  204 
  205         return (0);
  206 }
  207 
  208 int
  209 g_modevent(module_t mod, int type, void *data)
  210 {
  211         struct g_hh00 *hh;
  212         int error;
  213         static int g_ignition;
  214         struct g_class *mp;
  215 
  216         mp = data;
  217         if (mp->version != G_VERSION) {
  218                 printf("GEOM class %s has Wrong version %x\n",
  219                     mp->name, mp->version);
  220                 return (EINVAL);
  221         }
  222         if (!g_ignition) {
  223                 g_ignition++;
  224                 g_init();
  225         }
  226         error = EOPNOTSUPP;
  227         switch (type) {
  228         case MOD_LOAD:
  229                 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", mp->name);
  230                 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
  231                 hh->mp = mp;
  232                 /*
  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.
  236                  */
  237                 if (cold) {
  238                         hh->post = 1;
  239                         error = g_post_event(g_load_class, hh, M_WAITOK, NULL);
  240                 } else {
  241                         error = g_waitfor_event(g_load_class, hh, M_WAITOK,
  242                             NULL);
  243                         if (error == 0)
  244                                 error = hh->error;
  245                         g_free(hh);
  246                 }
  247                 break;
  248         case MOD_UNLOAD:
  249                 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", mp->name);
  250                 error = g_unload_class(mp);
  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 *mp, *mp2;
  264         struct g_geom *gp;
  265         struct g_hh00 *hh;
  266         struct g_provider *pp;
  267         struct g_consumer *cp;
  268 
  269         g_topology_assert();
  270         if (flag == EV_CANCEL)  /* XXX: can't happen ? */
  271                 return;
  272         if (g_shutdown || g_notaste)
  273                 return;
  274 
  275         hh = arg;
  276         mp = hh->mp;
  277         hh->error = 0;
  278         if (hh->post) {
  279                 g_free(hh);
  280                 hh = NULL;
  281         }
  282         g_trace(G_T_TOPOLOGY, "g_retaste(%s)", mp->name);
  283 
  284         LIST_FOREACH(mp2, &g_classes, class) {
  285                 LIST_FOREACH(gp, &mp2->geom, geom) {
  286                         LIST_FOREACH(pp, &gp->provider, provider) {
  287                                 if (pp->acr || pp->acw || pp->ace)
  288                                         continue;
  289                                 LIST_FOREACH(cp, &pp->consumers, consumers) {
  290                                         if (cp->geom->class == mp &&
  291                                             (cp->flags & G_CF_ORPHAN) == 0)
  292                                                 break;
  293                                 }
  294                                 if (cp != NULL) {
  295                                         cp->flags |= G_CF_ORPHAN;
  296                                         g_wither_geom(cp->geom, ENXIO);
  297                                 }
  298                                 mp->taste(mp, pp, 0);
  299                                 g_topology_assert();
  300                         }
  301                 }
  302         }
  303 }
  304 
  305 int
  306 g_retaste(struct g_class *mp)
  307 {
  308         struct g_hh00 *hh;
  309         int error;
  310 
  311         if (mp->taste == NULL)
  312                 return (EINVAL);
  313 
  314         hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
  315         hh->mp = mp;
  316 
  317         if (cold) {
  318                 hh->post = 1;
  319                 error = g_post_event(g_retaste_event, hh, M_WAITOK, NULL);
  320         } else {
  321                 error = g_waitfor_event(g_retaste_event, hh, M_WAITOK, NULL);
  322                 if (error == 0)
  323                         error = hh->error;
  324                 g_free(hh);
  325         }
  326 
  327         return (error);
  328 }
  329 
  330 struct g_geom *
  331 g_new_geomf(struct g_class *mp, const char *fmt, ...)
  332 {
  333         struct g_geom *gp;
  334         va_list ap;
  335         struct sbuf *sb;
  336 
  337         g_topology_assert();
  338         G_VALID_CLASS(mp);
  339         sb = sbuf_new_auto();
  340         va_start(ap, fmt);
  341         sbuf_vprintf(sb, fmt, ap);
  342         va_end(ap);
  343         sbuf_finish(sb);
  344         gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO);
  345         gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
  346         gp->class = mp;
  347         gp->rank = 1;
  348         LIST_INIT(&gp->consumer);
  349         LIST_INIT(&gp->provider);
  350         LIST_INSERT_HEAD(&mp->geom, gp, geom);
  351         TAILQ_INSERT_HEAD(&geoms, gp, geoms);
  352         strcpy(gp->name, sbuf_data(sb));
  353         sbuf_delete(sb);
  354         /* Fill in defaults from class */
  355         gp->start = mp->start;
  356         gp->spoiled = mp->spoiled;
  357         gp->attrchanged = mp->attrchanged;
  358         gp->providergone = mp->providergone;
  359         gp->dumpconf = mp->dumpconf;
  360         gp->access = mp->access;
  361         gp->orphan = mp->orphan;
  362         gp->ioctl = mp->ioctl;
  363         gp->resize = mp->resize;
  364         return (gp);
  365 }
  366 
  367 void
  368 g_destroy_geom(struct g_geom *gp)
  369 {
  370 
  371         g_topology_assert();
  372         G_VALID_GEOM(gp);
  373         g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name);
  374         KASSERT(LIST_EMPTY(&gp->consumer),
  375             ("g_destroy_geom(%s) with consumer(s) [%p]",
  376             gp->name, LIST_FIRST(&gp->consumer)));
  377         KASSERT(LIST_EMPTY(&gp->provider),
  378             ("g_destroy_geom(%s) with provider(s) [%p]",
  379             gp->name, LIST_FIRST(&gp->provider)));
  380         g_cancel_event(gp);
  381         LIST_REMOVE(gp, geom);
  382         TAILQ_REMOVE(&geoms, gp, geoms);
  383         g_free(gp->name);
  384         g_free(gp);
  385 }
  386 
  387 /*
  388  * This function is called (repeatedly) until the geom has withered away.
  389  */
  390 void
  391 g_wither_geom(struct g_geom *gp, int error)
  392 {
  393         struct g_provider *pp;
  394 
  395         g_topology_assert();
  396         G_VALID_GEOM(gp);
  397         g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name);
  398         if (!(gp->flags & G_GEOM_WITHER)) {
  399                 gp->flags |= G_GEOM_WITHER;
  400                 LIST_FOREACH(pp, &gp->provider, provider)
  401                         if (!(pp->flags & G_PF_ORPHAN))
  402                                 g_orphan_provider(pp, error);
  403         }
  404         g_do_wither();
  405 }
  406 
  407 /*
  408  * Convenience function to destroy a particular provider.
  409  */
  410 void
  411 g_wither_provider(struct g_provider *pp, int error)
  412 {
  413 
  414         pp->flags |= G_PF_WITHER;
  415         if (!(pp->flags & G_PF_ORPHAN))
  416                 g_orphan_provider(pp, error);
  417 }
  418 
  419 /*
  420  * This function is called (repeatedly) until the has withered away.
  421  */
  422 void
  423 g_wither_geom_close(struct g_geom *gp, int error)
  424 {
  425         struct g_consumer *cp;
  426 
  427         g_topology_assert();
  428         G_VALID_GEOM(gp);
  429         g_trace(G_T_TOPOLOGY, "g_wither_geom_close(%p(%s))", gp, gp->name);
  430         LIST_FOREACH(cp, &gp->consumer, consumer)
  431                 if (cp->acr || cp->acw || cp->ace)
  432                         g_access(cp, -cp->acr, -cp->acw, -cp->ace);
  433         g_wither_geom(gp, error);
  434 }
  435 
  436 /*
  437  * This function is called (repeatedly) until we cant wash away more
  438  * withered bits at present.
  439  */
  440 void
  441 g_wither_washer()
  442 {
  443         struct g_class *mp;
  444         struct g_geom *gp, *gp2;
  445         struct g_provider *pp, *pp2;
  446         struct g_consumer *cp, *cp2;
  447 
  448         g_topology_assert();
  449         LIST_FOREACH(mp, &g_classes, class) {
  450                 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
  451                         LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
  452                                 if (!(pp->flags & G_PF_WITHER))
  453                                         continue;
  454                                 if (LIST_EMPTY(&pp->consumers))
  455                                         g_destroy_provider(pp);
  456                         }
  457                         if (!(gp->flags & G_GEOM_WITHER))
  458                                 continue;
  459                         LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) {
  460                                 if (LIST_EMPTY(&pp->consumers))
  461                                         g_destroy_provider(pp);
  462                         }
  463                         LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) {
  464                                 if (cp->acr || cp->acw || cp->ace)
  465                                         continue;
  466                                 if (cp->provider != NULL)
  467                                         g_detach(cp);
  468                                 g_destroy_consumer(cp);
  469                         }
  470                         if (LIST_EMPTY(&gp->provider) &&
  471                             LIST_EMPTY(&gp->consumer))
  472                                 g_destroy_geom(gp);
  473                 }
  474         }
  475 }
  476 
  477 struct g_consumer *
  478 g_new_consumer(struct g_geom *gp)
  479 {
  480         struct g_consumer *cp;
  481 
  482         g_topology_assert();
  483         G_VALID_GEOM(gp);
  484         KASSERT(!(gp->flags & G_GEOM_WITHER),
  485             ("g_new_consumer on WITHERing geom(%s) (class %s)",
  486             gp->name, gp->class->name));
  487         KASSERT(gp->orphan != NULL,
  488             ("g_new_consumer on geom(%s) (class %s) without orphan",
  489             gp->name, gp->class->name));
  490 
  491         cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO);
  492         cp->geom = gp;
  493         cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED,
  494             DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
  495         LIST_INSERT_HEAD(&gp->consumer, cp, consumer);
  496         return(cp);
  497 }
  498 
  499 void
  500 g_destroy_consumer(struct g_consumer *cp)
  501 {
  502         struct g_geom *gp;
  503 
  504         g_topology_assert();
  505         G_VALID_CONSUMER(cp);
  506         g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp);
  507         KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached"));
  508         KASSERT (cp->acr == 0, ("g_destroy_consumer with acr"));
  509         KASSERT (cp->acw == 0, ("g_destroy_consumer with acw"));
  510         KASSERT (cp->ace == 0, ("g_destroy_consumer with ace"));
  511         g_cancel_event(cp);
  512         gp = cp->geom;
  513         LIST_REMOVE(cp, consumer);
  514         devstat_remove_entry(cp->stat);
  515         g_free(cp);
  516         if (gp->flags & G_GEOM_WITHER)
  517                 g_do_wither();
  518 }
  519 
  520 static void
  521 g_new_provider_event(void *arg, int flag)
  522 {
  523         struct g_class *mp;
  524         struct g_provider *pp;
  525         struct g_consumer *cp, *next_cp;
  526 
  527         g_topology_assert();
  528         if (flag == EV_CANCEL)
  529                 return;
  530         if (g_shutdown)
  531                 return;
  532         pp = arg;
  533         G_VALID_PROVIDER(pp);
  534         KASSERT(!(pp->flags & G_PF_WITHER),
  535             ("g_new_provider_event but withered"));
  536         LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, next_cp) {
  537                 if ((cp->flags & G_CF_ORPHAN) == 0 &&
  538                     cp->geom->attrchanged != NULL)
  539                         cp->geom->attrchanged(cp, "GEOM::media");
  540         }
  541         if (g_notaste)
  542                 return;
  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                             (cp->flags & G_CF_ORPHAN) == 0)
  549                                 break;
  550                 if (cp != NULL)
  551                         continue;
  552                 mp->taste(mp, pp, 0);
  553                 g_topology_assert();
  554         }
  555 }
  556 
  557 
  558 struct g_provider *
  559 g_new_providerf(struct g_geom *gp, const char *fmt, ...)
  560 {
  561         struct g_provider *pp;
  562         struct sbuf *sb;
  563         va_list ap;
  564 
  565         g_topology_assert();
  566         G_VALID_GEOM(gp);
  567         KASSERT(gp->access != NULL,
  568             ("new provider on geom(%s) without ->access (class %s)",
  569             gp->name, gp->class->name));
  570         KASSERT(gp->start != NULL,
  571             ("new provider on geom(%s) without ->start (class %s)",
  572             gp->name, gp->class->name));
  573         KASSERT(!(gp->flags & G_GEOM_WITHER),
  574             ("new provider on WITHERing geom(%s) (class %s)",
  575             gp->name, gp->class->name));
  576         sb = sbuf_new_auto();
  577         va_start(ap, fmt);
  578         sbuf_vprintf(sb, fmt, ap);
  579         va_end(ap);
  580         sbuf_finish(sb);
  581         pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO);
  582         pp->name = (char *)(pp + 1);
  583         strcpy(pp->name, sbuf_data(sb));
  584         sbuf_delete(sb);
  585         LIST_INIT(&pp->consumers);
  586         pp->error = ENXIO;
  587         pp->geom = gp;
  588         pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED,
  589             DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
  590         LIST_INSERT_HEAD(&gp->provider, pp, provider);
  591         g_post_event(g_new_provider_event, pp, M_WAITOK, pp, gp, NULL);
  592         return (pp);
  593 }
  594 
  595 void
  596 g_error_provider(struct g_provider *pp, int error)
  597 {
  598 
  599         /* G_VALID_PROVIDER(pp);  We may not have g_topology */
  600         pp->error = error;
  601 }
  602 
  603 static void
  604 g_resize_provider_event(void *arg, int flag)
  605 {
  606         struct g_hh00 *hh;
  607         struct g_class *mp;
  608         struct g_geom *gp;
  609         struct g_provider *pp;
  610         struct g_consumer *cp, *cp2;
  611         off_t size;
  612 
  613         g_topology_assert();
  614         if (g_shutdown)
  615                 return;
  616 
  617         hh = arg;
  618         pp = hh->pp;
  619         size = hh->size;
  620         g_free(hh);
  621 
  622         G_VALID_PROVIDER(pp);
  623         KASSERT(!(pp->flags & G_PF_WITHER),
  624             ("g_resize_provider_event but withered"));
  625         g_trace(G_T_TOPOLOGY, "g_resize_provider_event(%p)", pp);
  626 
  627         LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) {
  628                 gp = cp->geom;
  629                 if (gp->resize == NULL && size < pp->mediasize) {
  630                         cp->flags |= G_CF_ORPHAN;
  631                         cp->geom->orphan(cp);
  632                 }
  633         }
  634 
  635         pp->mediasize = size;
  636         
  637         LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) {
  638                 gp = cp->geom;
  639                 if ((gp->flags & G_GEOM_WITHER) == 0 && gp->resize != NULL)
  640                         gp->resize(cp);
  641         }
  642 
  643         /*
  644          * After resizing, the previously invalid GEOM class metadata
  645          * might become valid.  This means we should retaste.
  646          */
  647         LIST_FOREACH(mp, &g_classes, class) {
  648                 if (mp->taste == NULL)
  649                         continue;
  650                 LIST_FOREACH(cp, &pp->consumers, consumers)
  651                         if (cp->geom->class == mp &&
  652                             (cp->flags & G_CF_ORPHAN) == 0)
  653                                 break;
  654                 if (cp != NULL)
  655                         continue;
  656                 mp->taste(mp, pp, 0);
  657                 g_topology_assert();
  658         }
  659 }
  660 
  661 void
  662 g_resize_provider(struct g_provider *pp, off_t size)
  663 {
  664         struct g_hh00 *hh;
  665 
  666         G_VALID_PROVIDER(pp);
  667         if (pp->flags & G_PF_WITHER)
  668                 return;
  669 
  670         if (size == pp->mediasize)
  671                 return;
  672 
  673         hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO);
  674         hh->pp = pp;
  675         hh->size = size;
  676         g_post_event(g_resize_provider_event, hh, M_WAITOK, NULL);
  677 }
  678 
  679 #ifndef _PATH_DEV
  680 #define _PATH_DEV       "/dev/"
  681 #endif
  682 
  683 struct g_provider *
  684 g_provider_by_name(char const *arg)
  685 {
  686         struct g_class *cp;
  687         struct g_geom *gp;
  688         struct g_provider *pp, *wpp;
  689 
  690         if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
  691                 arg += sizeof(_PATH_DEV) - 1;
  692 
  693         wpp = NULL;
  694         LIST_FOREACH(cp, &g_classes, class) {
  695                 LIST_FOREACH(gp, &cp->geom, geom) {
  696                         LIST_FOREACH(pp, &gp->provider, provider) {
  697                                 if (strcmp(arg, pp->name) != 0)
  698                                         continue;
  699                                 if ((gp->flags & G_GEOM_WITHER) == 0 &&
  700                                     (pp->flags & G_PF_WITHER) == 0)
  701                                         return (pp);
  702                                 else
  703                                         wpp = pp;
  704                         }
  705                 }
  706         }
  707 
  708         return (wpp);
  709 }
  710 
  711 void
  712 g_destroy_provider(struct g_provider *pp)
  713 {
  714         struct g_geom *gp;
  715 
  716         g_topology_assert();
  717         G_VALID_PROVIDER(pp);
  718         KASSERT(LIST_EMPTY(&pp->consumers),
  719             ("g_destroy_provider but attached"));
  720         KASSERT (pp->acr == 0, ("g_destroy_provider with acr"));
  721         KASSERT (pp->acw == 0, ("g_destroy_provider with acw"));
  722         KASSERT (pp->ace == 0, ("g_destroy_provider with ace"));
  723         g_cancel_event(pp);
  724         LIST_REMOVE(pp, provider);
  725         gp = pp->geom;
  726         devstat_remove_entry(pp->stat);
  727         /*
  728          * If a callback was provided, send notification that the provider
  729          * is now gone.
  730          */
  731         if (gp->providergone != NULL)
  732                 gp->providergone(pp);
  733 
  734         g_free(pp);
  735         if ((gp->flags & G_GEOM_WITHER))
  736                 g_do_wither();
  737 }
  738 
  739 /*
  740  * We keep the "geoms" list sorted by topological order (== increasing
  741  * numerical rank) at all times.
  742  * When an attach is done, the attaching geoms rank is invalidated
  743  * and it is moved to the tail of the list.
  744  * All geoms later in the sequence has their ranks reevaluated in
  745  * sequence.  If we cannot assign rank to a geom because it's
  746  * prerequisites do not have rank, we move that element to the tail
  747  * of the sequence with invalid rank as well.
  748  * At some point we encounter our original geom and if we stil fail
  749  * to assign it a rank, there must be a loop and we fail back to
  750  * g_attach() which detach again and calls redo_rank again
  751  * to fix up the damage.
  752  * It would be much simpler code wise to do it recursively, but we
  753  * can't risk that on the kernel stack.
  754  */
  755 
  756 static int
  757 redo_rank(struct g_geom *gp)
  758 {
  759         struct g_consumer *cp;
  760         struct g_geom *gp1, *gp2;
  761         int n, m;
  762 
  763         g_topology_assert();
  764         G_VALID_GEOM(gp);
  765 
  766         /* Invalidate this geoms rank and move it to the tail */
  767         gp1 = TAILQ_NEXT(gp, geoms);
  768         if (gp1 != NULL) {
  769                 gp->rank = 0;
  770                 TAILQ_REMOVE(&geoms, gp, geoms);
  771                 TAILQ_INSERT_TAIL(&geoms, gp, geoms);
  772         } else {
  773                 gp1 = gp;
  774         }
  775 
  776         /* re-rank the rest of the sequence */
  777         for (; gp1 != NULL; gp1 = gp2) {
  778                 gp1->rank = 0;
  779                 m = 1;
  780                 LIST_FOREACH(cp, &gp1->consumer, consumer) {
  781                         if (cp->provider == NULL)
  782                                 continue;
  783                         n = cp->provider->geom->rank;
  784                         if (n == 0) {
  785                                 m = 0;
  786                                 break;
  787                         } else if (n >= m)
  788                                 m = n + 1;
  789                 }
  790                 gp1->rank = m;
  791                 gp2 = TAILQ_NEXT(gp1, geoms);
  792 
  793                 /* got a rank, moving on */
  794                 if (m != 0)
  795                         continue;
  796 
  797                 /* no rank to original geom means loop */
  798                 if (gp == gp1) 
  799                         return (ELOOP);
  800 
  801                 /* no rank, put it at the end move on */
  802                 TAILQ_REMOVE(&geoms, gp1, geoms);
  803                 TAILQ_INSERT_TAIL(&geoms, gp1, geoms);
  804         }
  805         return (0);
  806 }
  807 
  808 int
  809 g_attach(struct g_consumer *cp, struct g_provider *pp)
  810 {
  811         int error;
  812 
  813         g_topology_assert();
  814         G_VALID_CONSUMER(cp);
  815         G_VALID_PROVIDER(pp);
  816         g_trace(G_T_TOPOLOGY, "g_attach(%p, %p)", cp, pp);
  817         KASSERT(cp->provider == NULL, ("attach but attached"));
  818         cp->provider = pp;
  819         cp->flags &= ~G_CF_ORPHAN;
  820         LIST_INSERT_HEAD(&pp->consumers, cp, consumers);
  821         error = redo_rank(cp->geom);
  822         if (error) {
  823                 LIST_REMOVE(cp, consumers);
  824                 cp->provider = NULL;
  825                 redo_rank(cp->geom);
  826         }
  827         return (error);
  828 }
  829 
  830 void
  831 g_detach(struct g_consumer *cp)
  832 {
  833         struct g_provider *pp;
  834 
  835         g_topology_assert();
  836         G_VALID_CONSUMER(cp);
  837         g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp);
  838         KASSERT(cp->provider != NULL, ("detach but not attached"));
  839         KASSERT(cp->acr == 0, ("detach but nonzero acr"));
  840         KASSERT(cp->acw == 0, ("detach but nonzero acw"));
  841         KASSERT(cp->ace == 0, ("detach but nonzero ace"));
  842         KASSERT(cp->nstart == cp->nend,
  843             ("detach with active requests"));
  844         pp = cp->provider;
  845         LIST_REMOVE(cp, consumers);
  846         cp->provider = NULL;
  847         if ((cp->geom->flags & G_GEOM_WITHER) ||
  848             (pp->geom->flags & G_GEOM_WITHER) ||
  849             (pp->flags & G_PF_WITHER))
  850                 g_do_wither();
  851         redo_rank(cp->geom);
  852 }
  853 
  854 /*
  855  * g_access()
  856  *
  857  * Access-check with delta values.  The question asked is "can provider
  858  * "cp" change the access counters by the relative amounts dc[rwe] ?"
  859  */
  860 
  861 int
  862 g_access(struct g_consumer *cp, int dcr, int dcw, int dce)
  863 {
  864         struct g_provider *pp;
  865         struct g_geom *gp;
  866         int pw, pe;
  867 #ifdef INVARIANTS
  868         int sr, sw, se;
  869 #endif
  870         int error;
  871 
  872         g_topology_assert();
  873         G_VALID_CONSUMER(cp);
  874         pp = cp->provider;
  875         KASSERT(pp != NULL, ("access but not attached"));
  876         G_VALID_PROVIDER(pp);
  877         gp = pp->geom;
  878 
  879         g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)",
  880             cp, pp->name, dcr, dcw, dce);
  881 
  882         KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr"));
  883         KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw"));
  884         KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace"));
  885         KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request"));
  886         KASSERT(gp->access != NULL, ("NULL geom->access"));
  887 
  888         /*
  889          * If our class cares about being spoiled, and we have been, we
  890          * are probably just ahead of the event telling us that.  Fail
  891          * now rather than having to unravel this later.
  892          */
  893         if (cp->geom->spoiled != NULL && (cp->flags & G_CF_SPOILED) &&
  894             (dcr > 0 || dcw > 0 || dce > 0))
  895                 return (ENXIO);
  896 
  897         /*
  898          * A number of GEOM classes either need to perform an I/O on the first
  899          * open or to acquire a different subsystem's lock.  To do that they
  900          * may have to drop the topology lock.
  901          * Other GEOM classes perform special actions when opening a lower rank
  902          * geom for the first time.  As a result, more than one thread may
  903          * end up performing the special actions.
  904          * So, we prevent concurrent "first" opens by marking the consumer with
  905          * special flag.
  906          *
  907          * Note that if the geom's access method never drops the topology lock,
  908          * then we will never see G_GEOM_IN_ACCESS here.
  909          */
  910         while ((gp->flags & G_GEOM_IN_ACCESS) != 0) {
  911                 g_trace(G_T_ACCESS,
  912                     "%s: race on geom %s via provider %s and consumer of %s",
  913                     __func__, gp->name, pp->name, cp->geom->name);
  914                 gp->flags |= G_GEOM_ACCESS_WAIT;
  915                 g_topology_sleep(gp, 0);
  916         }
  917 
  918         /*
  919          * Figure out what counts the provider would have had, if this
  920          * consumer had (r0w0e0) at this time.
  921          */
  922         pw = pp->acw - cp->acw;
  923         pe = pp->ace - cp->ace;
  924 
  925         g_trace(G_T_ACCESS,
  926     "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)",
  927             dcr, dcw, dce,
  928             cp->acr, cp->acw, cp->ace,
  929             pp->acr, pp->acw, pp->ace,
  930             pp, pp->name);
  931 
  932         /* If foot-shooting is enabled, any open on rank#1 is OK */
  933         if ((g_debugflags & 16) && gp->rank == 1)
  934                 ;
  935         /* If we try exclusive but already write: fail */
  936         else if (dce > 0 && pw > 0)
  937                 return (EPERM);
  938         /* If we try write but already exclusive: fail */
  939         else if (dcw > 0 && pe > 0)
  940                 return (EPERM);
  941         /* If we try to open more but provider is error'ed: fail */
  942         else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0) {
  943                 printf("%s(%d): provider %s has error %d set\n",
  944                     __func__, __LINE__, pp->name, pp->error);
  945                 return (pp->error);
  946         }
  947 
  948         /* Ok then... */
  949 
  950 #ifdef INVARIANTS
  951         sr = cp->acr;
  952         sw = cp->acw;
  953         se = cp->ace;
  954 #endif
  955         gp->flags |= G_GEOM_IN_ACCESS;
  956         error = gp->access(pp, dcr, dcw, dce);
  957         KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0,
  958             ("Geom provider %s::%s dcr=%d dcw=%d dce=%d error=%d failed "
  959             "closing ->access()", gp->class->name, pp->name, dcr, dcw,
  960             dce, error));
  961 
  962         g_topology_assert();
  963         gp->flags &= ~G_GEOM_IN_ACCESS;
  964         KASSERT(cp->acr == sr && cp->acw == sw && cp->ace == se,
  965             ("Access counts changed during geom->access"));
  966         if ((gp->flags & G_GEOM_ACCESS_WAIT) != 0) {
  967                 gp->flags &= ~G_GEOM_ACCESS_WAIT;
  968                 wakeup(gp);
  969         }
  970 
  971         if (!error) {
  972                 /*
  973                  * If we open first write, spoil any partner consumers.
  974                  * If we close last write and provider is not errored,
  975                  * trigger re-taste.
  976                  */
  977                 if (pp->acw == 0 && dcw != 0)
  978                         g_spoil(pp, cp);
  979                 else if (pp->acw != 0 && pp->acw == -dcw && pp->error == 0 &&
  980                     !(gp->flags & G_GEOM_WITHER))
  981                         g_post_event(g_new_provider_event, pp, M_WAITOK, 
  982                             pp, NULL);
  983 
  984                 pp->acr += dcr;
  985                 pp->acw += dcw;
  986                 pp->ace += dce;
  987                 cp->acr += dcr;
  988                 cp->acw += dcw;
  989                 cp->ace += dce;
  990                 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)
  991                         KASSERT(pp->sectorsize > 0,
  992                             ("Provider %s lacks sectorsize", pp->name));
  993                 if ((cp->geom->flags & G_GEOM_WITHER) &&
  994                     cp->acr == 0 && cp->acw == 0 && cp->ace == 0)
  995                         g_do_wither();
  996         }
  997         return (error);
  998 }
  999 
 1000 int
 1001 g_handleattr_int(struct bio *bp, const char *attribute, int val)
 1002 {
 1003 
 1004         return (g_handleattr(bp, attribute, &val, sizeof val));
 1005 }
 1006 
 1007 int
 1008 g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val)
 1009 {
 1010 
 1011         return (g_handleattr(bp, attribute, &val, sizeof val));
 1012 }
 1013 
 1014 int
 1015 g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val)
 1016 {
 1017 
 1018         return (g_handleattr(bp, attribute, &val, sizeof val));
 1019 }
 1020 
 1021 int
 1022 g_handleattr_str(struct bio *bp, const char *attribute, const char *str)
 1023 {
 1024 
 1025         return (g_handleattr(bp, attribute, str, 0));
 1026 }
 1027 
 1028 int
 1029 g_handleattr(struct bio *bp, const char *attribute, const void *val, int len)
 1030 {
 1031         int error = 0;
 1032 
 1033         if (strcmp(bp->bio_attribute, attribute))
 1034                 return (0);
 1035         if (len == 0) {
 1036                 bzero(bp->bio_data, bp->bio_length);
 1037                 if (strlcpy(bp->bio_data, val, bp->bio_length) >=
 1038                     bp->bio_length) {
 1039                         printf("%s: %s bio_length %jd len %zu -> EFAULT\n",
 1040                             __func__, bp->bio_to->name,
 1041                             (intmax_t)bp->bio_length, strlen(val));
 1042                         error = EFAULT;
 1043                 }
 1044         } else if (bp->bio_length == len) {
 1045                 bcopy(val, bp->bio_data, len);
 1046         } else {
 1047                 printf("%s: %s bio_length %jd len %d -> EFAULT\n", __func__,
 1048                     bp->bio_to->name, (intmax_t)bp->bio_length, len);
 1049                 error = EFAULT;
 1050         }
 1051         if (error == 0)
 1052                 bp->bio_completed = bp->bio_length;
 1053         g_io_deliver(bp, error);
 1054         return (1);
 1055 }
 1056 
 1057 int
 1058 g_std_access(struct g_provider *pp,
 1059         int dr __unused, int dw __unused, int de __unused)
 1060 {
 1061 
 1062         g_topology_assert();
 1063         G_VALID_PROVIDER(pp);
 1064         return (0);
 1065 }
 1066 
 1067 void
 1068 g_std_done(struct bio *bp)
 1069 {
 1070         struct bio *bp2;
 1071 
 1072         bp2 = bp->bio_parent;
 1073         if (bp2->bio_error == 0)
 1074                 bp2->bio_error = bp->bio_error;
 1075         bp2->bio_completed += bp->bio_completed;
 1076         g_destroy_bio(bp);
 1077         bp2->bio_inbed++;
 1078         if (bp2->bio_children == bp2->bio_inbed)
 1079                 g_io_deliver(bp2, bp2->bio_error);
 1080 }
 1081 
 1082 /* XXX: maybe this is only g_slice_spoiled */
 1083 
 1084 void
 1085 g_std_spoiled(struct g_consumer *cp)
 1086 {
 1087         struct g_geom *gp;
 1088         struct g_provider *pp;
 1089 
 1090         g_topology_assert();
 1091         G_VALID_CONSUMER(cp);
 1092         g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp);
 1093         cp->flags |= G_CF_ORPHAN;
 1094         g_detach(cp);
 1095         gp = cp->geom;
 1096         LIST_FOREACH(pp, &gp->provider, provider)
 1097                 g_orphan_provider(pp, ENXIO);
 1098         g_destroy_consumer(cp);
 1099         if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer))
 1100                 g_destroy_geom(gp);
 1101         else
 1102                 gp->flags |= G_GEOM_WITHER;
 1103 }
 1104 
 1105 /*
 1106  * Spoiling happens when a provider is opened for writing, but consumers
 1107  * which are configured by in-band data are attached (slicers for instance).
 1108  * Since the write might potentially change the in-band data, such consumers
 1109  * need to re-evaluate their existence after the writing session closes.
 1110  * We do this by (offering to) tear them down when the open for write happens
 1111  * in return for a re-taste when it closes again.
 1112  * Together with the fact that such consumers grab an 'e' bit whenever they
 1113  * are open, regardless of mode, this ends up DTRT.
 1114  */
 1115 
 1116 static void
 1117 g_spoil_event(void *arg, int flag)
 1118 {
 1119         struct g_provider *pp;
 1120         struct g_consumer *cp, *cp2;
 1121 
 1122         g_topology_assert();
 1123         if (flag == EV_CANCEL)
 1124                 return;
 1125         pp = arg;
 1126         G_VALID_PROVIDER(pp);
 1127         g_trace(G_T_TOPOLOGY, "%s %p(%s:%s:%s)", __func__, pp,
 1128             pp->geom->class->name, pp->geom->name, pp->name);
 1129         for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) {
 1130                 cp2 = LIST_NEXT(cp, consumers);
 1131                 if ((cp->flags & G_CF_SPOILED) == 0)
 1132                         continue;
 1133                 cp->flags &= ~G_CF_SPOILED;
 1134                 if (cp->geom->spoiled == NULL)
 1135                         continue;
 1136                 cp->geom->spoiled(cp);
 1137                 g_topology_assert();
 1138         }
 1139 }
 1140 
 1141 void
 1142 g_spoil(struct g_provider *pp, struct g_consumer *cp)
 1143 {
 1144         struct g_consumer *cp2;
 1145 
 1146         g_topology_assert();
 1147         G_VALID_PROVIDER(pp);
 1148         G_VALID_CONSUMER(cp);
 1149 
 1150         LIST_FOREACH(cp2, &pp->consumers, consumers) {
 1151                 if (cp2 == cp)
 1152                         continue;
 1153 /*
 1154                 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr));
 1155                 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw));
 1156 */
 1157                 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace));
 1158                 cp2->flags |= G_CF_SPOILED;
 1159         }
 1160         g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL);
 1161 }
 1162 
 1163 static void
 1164 g_media_changed_event(void *arg, int flag)
 1165 {
 1166         struct g_provider *pp;
 1167         int retaste;
 1168 
 1169         g_topology_assert();
 1170         if (flag == EV_CANCEL)
 1171                 return;
 1172         pp = arg;
 1173         G_VALID_PROVIDER(pp);
 1174 
 1175         /*
 1176          * If provider was not open for writing, queue retaste after spoiling.
 1177          * If it was, retaste will happen automatically on close.
 1178          */
 1179         retaste = (pp->acw == 0 && pp->error == 0 &&
 1180             !(pp->geom->flags & G_GEOM_WITHER));
 1181         g_spoil_event(arg, flag);
 1182         if (retaste)
 1183                 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, NULL);
 1184 }
 1185 
 1186 int
 1187 g_media_changed(struct g_provider *pp, int flag)
 1188 {
 1189         struct g_consumer *cp;
 1190 
 1191         LIST_FOREACH(cp, &pp->consumers, consumers)
 1192                 cp->flags |= G_CF_SPOILED;
 1193         return (g_post_event(g_media_changed_event, pp, flag, pp, NULL));
 1194 }
 1195 
 1196 int
 1197 g_media_gone(struct g_provider *pp, int flag)
 1198 {
 1199         struct g_consumer *cp;
 1200 
 1201         LIST_FOREACH(cp, &pp->consumers, consumers)
 1202                 cp->flags |= G_CF_SPOILED;
 1203         return (g_post_event(g_spoil_event, pp, flag, pp, NULL));
 1204 }
 1205 
 1206 int
 1207 g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len)
 1208 {
 1209         int error, i;
 1210 
 1211         i = len;
 1212         error = g_io_getattr(attr, cp, &i, var);
 1213         if (error)
 1214                 return (error);
 1215         if (i != len)
 1216                 return (EINVAL);
 1217         return (0);
 1218 }
 1219 
 1220 static int
 1221 g_get_device_prefix_len(const char *name)
 1222 {
 1223         int len;
 1224 
 1225         if (strncmp(name, "ada", 3) == 0)
 1226                 len = 3;
 1227         else if (strncmp(name, "ad", 2) == 0)
 1228                 len = 2;
 1229         else
 1230                 return (0);
 1231         if (name[len] < '' || name[len] > '9')
 1232                 return (0);
 1233         do {
 1234                 len++;
 1235         } while (name[len] >= '' && name[len] <= '9');
 1236         return (len);
 1237 }
 1238 
 1239 int
 1240 g_compare_names(const char *namea, const char *nameb)
 1241 {
 1242         int deva, devb;
 1243 
 1244         if (strcmp(namea, nameb) == 0)
 1245                 return (1);
 1246         deva = g_get_device_prefix_len(namea);
 1247         if (deva == 0)
 1248                 return (0);
 1249         devb = g_get_device_prefix_len(nameb);
 1250         if (devb == 0)
 1251                 return (0);
 1252         if (strcmp(namea + deva, nameb + devb) == 0)
 1253                 return (1);
 1254         return (0);
 1255 }
 1256 
 1257 #if defined(DIAGNOSTIC) || defined(DDB)
 1258 /*
 1259  * This function walks the mesh and returns a non-zero integer if it
 1260  * finds the argument pointer is an object. The return value indicates
 1261  * which type of object it is believed to be. If topology is not locked,
 1262  * this function is potentially dangerous, but we don't assert that the
 1263  * topology lock is held when called from debugger.
 1264  */
 1265 int
 1266 g_valid_obj(void const *ptr)
 1267 {
 1268         struct g_class *mp;
 1269         struct g_geom *gp;
 1270         struct g_consumer *cp;
 1271         struct g_provider *pp;
 1272 
 1273 #ifdef KDB
 1274         if (kdb_active == 0)
 1275 #endif
 1276                 g_topology_assert();
 1277 
 1278         LIST_FOREACH(mp, &g_classes, class) {
 1279                 if (ptr == mp)
 1280                         return (1);
 1281                 LIST_FOREACH(gp, &mp->geom, geom) {
 1282                         if (ptr == gp)
 1283                                 return (2);
 1284                         LIST_FOREACH(cp, &gp->consumer, consumer)
 1285                                 if (ptr == cp)
 1286                                         return (3);
 1287                         LIST_FOREACH(pp, &gp->provider, provider)
 1288                                 if (ptr == pp)
 1289                                         return (4);
 1290                 }
 1291         }
 1292         return(0);
 1293 }
 1294 #endif
 1295 
 1296 #ifdef DDB
 1297 
 1298 #define gprintf(...)    do {                                            \
 1299         db_printf("%*s", indent, "");                                   \
 1300         db_printf(__VA_ARGS__);                                         \
 1301 } while (0)
 1302 #define gprintln(...)   do {                                            \
 1303         gprintf(__VA_ARGS__);                                           \
 1304         db_printf("\n");                                                \
 1305 } while (0)
 1306 
 1307 #define ADDFLAG(obj, flag, sflag)       do {                            \
 1308         if ((obj)->flags & (flag)) {                                    \
 1309                 if (comma)                                              \
 1310                         strlcat(str, ",", size);                        \
 1311                 strlcat(str, (sflag), size);                            \
 1312                 comma = 1;                                              \
 1313         }                                                               \
 1314 } while (0)
 1315 
 1316 static char *
 1317 provider_flags_to_string(struct g_provider *pp, char *str, size_t size)
 1318 {
 1319         int comma = 0;
 1320 
 1321         bzero(str, size);
 1322         if (pp->flags == 0) {
 1323                 strlcpy(str, "NONE", size);
 1324                 return (str);
 1325         }
 1326         ADDFLAG(pp, G_PF_WITHER, "G_PF_WITHER");
 1327         ADDFLAG(pp, G_PF_ORPHAN, "G_PF_ORPHAN");
 1328         return (str);
 1329 }
 1330 
 1331 static char *
 1332 geom_flags_to_string(struct g_geom *gp, char *str, size_t size)
 1333 {
 1334         int comma = 0;
 1335 
 1336         bzero(str, size);
 1337         if (gp->flags == 0) {
 1338                 strlcpy(str, "NONE", size);
 1339                 return (str);
 1340         }
 1341         ADDFLAG(gp, G_GEOM_WITHER, "G_GEOM_WITHER");
 1342         return (str);
 1343 }
 1344 static void
 1345 db_show_geom_consumer(int indent, struct g_consumer *cp)
 1346 {
 1347 
 1348         if (indent == 0) {
 1349                 gprintln("consumer: %p", cp);
 1350                 gprintln("  class:    %s (%p)", cp->geom->class->name,
 1351                     cp->geom->class);
 1352                 gprintln("  geom:     %s (%p)", cp->geom->name, cp->geom);
 1353                 if (cp->provider == NULL)
 1354                         gprintln("  provider: none");
 1355                 else {
 1356                         gprintln("  provider: %s (%p)", cp->provider->name,
 1357                             cp->provider);
 1358                 }
 1359                 gprintln("  access:   r%dw%de%d", cp->acr, cp->acw, cp->ace);
 1360                 gprintln("  flags:    0x%04x", cp->flags);
 1361                 gprintln("  nstart:   %u", cp->nstart);
 1362                 gprintln("  nend:     %u", cp->nend);
 1363         } else {
 1364                 gprintf("consumer: %p (%s), access=r%dw%de%d", cp,
 1365                     cp->provider != NULL ? cp->provider->name : "none",
 1366                     cp->acr, cp->acw, cp->ace);
 1367                 if (cp->flags)
 1368                         db_printf(", flags=0x%04x", cp->flags);
 1369                 db_printf("\n");
 1370         }
 1371 }
 1372 
 1373 static void
 1374 db_show_geom_provider(int indent, struct g_provider *pp)
 1375 {
 1376         struct g_consumer *cp;
 1377         char flags[64];
 1378 
 1379         if (indent == 0) {
 1380                 gprintln("provider: %s (%p)", pp->name, pp);
 1381                 gprintln("  class:        %s (%p)", pp->geom->class->name,
 1382                     pp->geom->class);
 1383                 gprintln("  geom:         %s (%p)", pp->geom->name, pp->geom);
 1384                 gprintln("  mediasize:    %jd", (intmax_t)pp->mediasize);
 1385                 gprintln("  sectorsize:   %u", pp->sectorsize);
 1386                 gprintln("  stripesize:   %u", pp->stripesize);
 1387                 gprintln("  stripeoffset: %u", pp->stripeoffset);
 1388                 gprintln("  access:       r%dw%de%d", pp->acr, pp->acw,
 1389                     pp->ace);
 1390                 gprintln("  flags:        %s (0x%04x)",
 1391                     provider_flags_to_string(pp, flags, sizeof(flags)),
 1392                     pp->flags);
 1393                 gprintln("  error:        %d", pp->error);
 1394                 gprintln("  nstart:       %u", pp->nstart);
 1395                 gprintln("  nend:         %u", pp->nend);
 1396                 if (LIST_EMPTY(&pp->consumers))
 1397                         gprintln("  consumers:    none");
 1398         } else {
 1399                 gprintf("provider: %s (%p), access=r%dw%de%d",
 1400                     pp->name, pp, pp->acr, pp->acw, pp->ace);
 1401                 if (pp->flags != 0) {
 1402                         db_printf(", flags=%s (0x%04x)",
 1403                             provider_flags_to_string(pp, flags, sizeof(flags)),
 1404                             pp->flags);
 1405                 }
 1406                 db_printf("\n");
 1407         }
 1408         if (!LIST_EMPTY(&pp->consumers)) {
 1409                 LIST_FOREACH(cp, &pp->consumers, consumers) {
 1410                         db_show_geom_consumer(indent + 2, cp);
 1411                         if (db_pager_quit)
 1412                                 break;
 1413                 }
 1414         }
 1415 }
 1416 
 1417 static void
 1418 db_show_geom_geom(int indent, struct g_geom *gp)
 1419 {
 1420         struct g_provider *pp;
 1421         struct g_consumer *cp;
 1422         char flags[64];
 1423 
 1424         if (indent == 0) {
 1425                 gprintln("geom: %s (%p)", gp->name, gp);
 1426                 gprintln("  class:     %s (%p)", gp->class->name, gp->class);
 1427                 gprintln("  flags:     %s (0x%04x)",
 1428                     geom_flags_to_string(gp, flags, sizeof(flags)), gp->flags);
 1429                 gprintln("  rank:      %d", gp->rank);
 1430                 if (LIST_EMPTY(&gp->provider))
 1431                         gprintln("  providers: none");
 1432                 if (LIST_EMPTY(&gp->consumer))
 1433                         gprintln("  consumers: none");
 1434         } else {
 1435                 gprintf("geom: %s (%p), rank=%d", gp->name, gp, gp->rank);
 1436                 if (gp->flags != 0) {
 1437                         db_printf(", flags=%s (0x%04x)",
 1438                             geom_flags_to_string(gp, flags, sizeof(flags)),
 1439                             gp->flags);
 1440                 }
 1441                 db_printf("\n");
 1442         }
 1443         if (!LIST_EMPTY(&gp->provider)) {
 1444                 LIST_FOREACH(pp, &gp->provider, provider) {
 1445                         db_show_geom_provider(indent + 2, pp);
 1446                         if (db_pager_quit)
 1447                                 break;
 1448                 }
 1449         }
 1450         if (!LIST_EMPTY(&gp->consumer)) {
 1451                 LIST_FOREACH(cp, &gp->consumer, consumer) {
 1452                         db_show_geom_consumer(indent + 2, cp);
 1453                         if (db_pager_quit)
 1454                                 break;
 1455                 }
 1456         }
 1457 }
 1458 
 1459 static void
 1460 db_show_geom_class(struct g_class *mp)
 1461 {
 1462         struct g_geom *gp;
 1463 
 1464         db_printf("class: %s (%p)\n", mp->name, mp);
 1465         LIST_FOREACH(gp, &mp->geom, geom) {
 1466                 db_show_geom_geom(2, gp);
 1467                 if (db_pager_quit)
 1468                         break;
 1469         }
 1470 }
 1471 
 1472 /*
 1473  * Print the GEOM topology or the given object.
 1474  */
 1475 DB_SHOW_COMMAND(geom, db_show_geom)
 1476 {
 1477         struct g_class *mp;
 1478 
 1479         if (!have_addr) {
 1480                 /* No address given, print the entire topology. */
 1481                 LIST_FOREACH(mp, &g_classes, class) {
 1482                         db_show_geom_class(mp);
 1483                         db_printf("\n");
 1484                         if (db_pager_quit)
 1485                                 break;
 1486                 }
 1487         } else {
 1488                 switch (g_valid_obj((void *)addr)) {
 1489                 case 1:
 1490                         db_show_geom_class((struct g_class *)addr);
 1491                         break;
 1492                 case 2:
 1493                         db_show_geom_geom(0, (struct g_geom *)addr);
 1494                         break;
 1495                 case 3:
 1496                         db_show_geom_consumer(0, (struct g_consumer *)addr);
 1497                         break;
 1498                 case 4:
 1499                         db_show_geom_provider(0, (struct g_provider *)addr);
 1500                         break;
 1501                 default:
 1502                         db_printf("Not a GEOM object.\n");
 1503                         break;
 1504                 }
 1505         }
 1506 }
 1507 
 1508 static void
 1509 db_print_bio_cmd(struct bio *bp)
 1510 {
 1511         db_printf("  cmd: ");
 1512         switch (bp->bio_cmd) {
 1513         case BIO_READ: db_printf("BIO_READ"); break;
 1514         case BIO_WRITE: db_printf("BIO_WRITE"); break;
 1515         case BIO_DELETE: db_printf("BIO_DELETE"); break;
 1516         case BIO_GETATTR: db_printf("BIO_GETATTR"); break;
 1517         case BIO_FLUSH: db_printf("BIO_FLUSH"); break;
 1518         case BIO_CMD0: db_printf("BIO_CMD0"); break;
 1519         case BIO_CMD1: db_printf("BIO_CMD1"); break;
 1520         case BIO_CMD2: db_printf("BIO_CMD2"); break;
 1521         case BIO_ZONE: db_printf("BIO_ZONE"); break;
 1522         default: db_printf("UNKNOWN"); break;
 1523         }
 1524         db_printf("\n");
 1525 }
 1526 
 1527 static void
 1528 db_print_bio_flags(struct bio *bp)
 1529 {
 1530         int comma;
 1531 
 1532         comma = 0;
 1533         db_printf("  flags: ");
 1534         if (bp->bio_flags & BIO_ERROR) {
 1535                 db_printf("BIO_ERROR");
 1536                 comma = 1;
 1537         }
 1538         if (bp->bio_flags & BIO_DONE) {
 1539                 db_printf("%sBIO_DONE", (comma ? ", " : ""));
 1540                 comma = 1;
 1541         }
 1542         if (bp->bio_flags & BIO_ONQUEUE)
 1543                 db_printf("%sBIO_ONQUEUE", (comma ? ", " : ""));
 1544         db_printf("\n");
 1545 }
 1546 
 1547 /*
 1548  * Print useful information in a BIO
 1549  */
 1550 DB_SHOW_COMMAND(bio, db_show_bio)
 1551 {
 1552         struct bio *bp;
 1553 
 1554         if (have_addr) {
 1555                 bp = (struct bio *)addr;
 1556                 db_printf("BIO %p\n", bp);
 1557                 db_print_bio_cmd(bp);
 1558                 db_print_bio_flags(bp);
 1559                 db_printf("  cflags: 0x%hx\n", bp->bio_cflags);
 1560                 db_printf("  pflags: 0x%hx\n", bp->bio_pflags);
 1561                 db_printf("  offset: %jd\n", (intmax_t)bp->bio_offset);
 1562                 db_printf("  length: %jd\n", (intmax_t)bp->bio_length);
 1563                 db_printf("  bcount: %ld\n", bp->bio_bcount);
 1564                 db_printf("  resid: %ld\n", bp->bio_resid);
 1565                 db_printf("  completed: %jd\n", (intmax_t)bp->bio_completed);
 1566                 db_printf("  children: %u\n", bp->bio_children);
 1567                 db_printf("  inbed: %u\n", bp->bio_inbed);
 1568                 db_printf("  error: %d\n", bp->bio_error);
 1569                 db_printf("  parent: %p\n", bp->bio_parent);
 1570                 db_printf("  driver1: %p\n", bp->bio_driver1);
 1571                 db_printf("  driver2: %p\n", bp->bio_driver2);
 1572                 db_printf("  caller1: %p\n", bp->bio_caller1);
 1573                 db_printf("  caller2: %p\n", bp->bio_caller2);
 1574                 db_printf("  bio_from: %p\n", bp->bio_from);
 1575                 db_printf("  bio_to: %p\n", bp->bio_to);
 1576         }
 1577 }
 1578 
 1579 #undef  gprintf
 1580 #undef  gprintln
 1581 #undef  ADDFLAG
 1582 
 1583 #endif  /* DDB */

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