The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_dev.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2002 Poul-Henning Kamp
    5  * Copyright (c) 2002 Networks Associates Technology, Inc.
    6  * All rights reserved.
    7  *
    8  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    9  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   10  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   11  * DARPA CHATS research program.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. The names of the authors may not be used to endorse or promote
   22  *    products derived from this software without specific prior written
   23  *    permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/kernel.h>
   45 #include <sys/conf.h>
   46 #include <sys/ctype.h>
   47 #include <sys/bio.h>
   48 #include <sys/bus.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/proc.h>
   52 #include <sys/errno.h>
   53 #include <sys/time.h>
   54 #include <sys/disk.h>
   55 #include <sys/fcntl.h>
   56 #include <sys/limits.h>
   57 #include <sys/sysctl.h>
   58 #include <geom/geom.h>
   59 #include <geom/geom_int.h>
   60 #include <machine/stdarg.h>
   61 
   62 struct g_dev_softc {
   63         struct mtx       sc_mtx;
   64         struct cdev     *sc_dev;
   65         struct cdev     *sc_alias;
   66         int              sc_open;
   67         u_int            sc_active;
   68 #define SC_A_DESTROY    (1 << 31)
   69 #define SC_A_OPEN       (1 << 30)
   70 #define SC_A_ACTIVE     (SC_A_OPEN - 1)
   71 };
   72 
   73 static d_open_t         g_dev_open;
   74 static d_close_t        g_dev_close;
   75 static d_strategy_t     g_dev_strategy;
   76 static d_ioctl_t        g_dev_ioctl;
   77 
   78 static struct cdevsw g_dev_cdevsw = {
   79         .d_version =    D_VERSION,
   80         .d_open =       g_dev_open,
   81         .d_close =      g_dev_close,
   82         .d_read =       physread,
   83         .d_write =      physwrite,
   84         .d_ioctl =      g_dev_ioctl,
   85         .d_strategy =   g_dev_strategy,
   86         .d_name =       "g_dev",
   87         .d_flags =      D_DISK | D_TRACKCLOSE,
   88 };
   89 
   90 static g_init_t g_dev_init;
   91 static g_fini_t g_dev_fini;
   92 static g_taste_t g_dev_taste;
   93 static g_orphan_t g_dev_orphan;
   94 static g_attrchanged_t g_dev_attrchanged;
   95 
   96 static struct g_class g_dev_class       = {
   97         .name = "DEV",
   98         .version = G_VERSION,
   99         .init = g_dev_init,
  100         .fini = g_dev_fini,
  101         .taste = g_dev_taste,
  102         .orphan = g_dev_orphan,
  103         .attrchanged = g_dev_attrchanged
  104 };
  105 
  106 /*
  107  * We target 262144 (8 x 32768) sectors by default as this significantly
  108  * increases the throughput on commonly used SSD's with a marginal
  109  * increase in non-interruptible request latency.
  110  */
  111 static uint64_t g_dev_del_max_sectors = 262144;
  112 SYSCTL_DECL(_kern_geom);
  113 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff");
  114 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW,
  115     &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single "
  116     "delete request sent to the provider. Larger requests are chunked "
  117     "so they can be interrupted. (0 = disable chunking)");
  118 
  119 static char *dumpdev = NULL;
  120 static void
  121 g_dev_init(struct g_class *mp)
  122 {
  123 
  124         dumpdev = kern_getenv("dumpdev");
  125 }
  126 
  127 static void
  128 g_dev_fini(struct g_class *mp)
  129 {
  130 
  131         freeenv(dumpdev);
  132         dumpdev = NULL;
  133 }
  134 
  135 static int
  136 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda,
  137     struct thread *td)
  138 {
  139         struct g_kerneldump kd;
  140         struct g_consumer *cp;
  141         int error, len;
  142 
  143         if (dev == NULL || kda == NULL)
  144                 return (clear_dumper(td));
  145 
  146         cp = dev->si_drv2;
  147         len = sizeof(kd);
  148         memset(&kd, 0, len);
  149         kd.offset = 0;
  150         kd.length = OFF_MAX;
  151         error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd);
  152         if (error != 0)
  153                 return (error);
  154 
  155         error = set_dumper(&kd.di, devtoname(dev), td, kda->kda_compression,
  156             kda->kda_encryption, kda->kda_key, kda->kda_encryptedkeysize,
  157             kda->kda_encryptedkey);
  158         if (error == 0)
  159                 dev->si_flags |= SI_DUMPDEV;
  160 
  161         return (error);
  162 }
  163 
  164 static int
  165 init_dumpdev(struct cdev *dev)
  166 {
  167         struct diocskerneldump_arg kda;
  168         struct g_consumer *cp;
  169         const char *devprefix = "/dev/", *devname;
  170         int error;
  171         size_t len;
  172 
  173         bzero(&kda, sizeof(kda));
  174         kda.kda_enable = 1;
  175 
  176         if (dumpdev == NULL)
  177                 return (0);
  178 
  179         len = strlen(devprefix);
  180         devname = devtoname(dev);
  181         if (strcmp(devname, dumpdev) != 0 &&
  182            (strncmp(dumpdev, devprefix, len) != 0 ||
  183             strcmp(devname, dumpdev + len) != 0))
  184                 return (0);
  185 
  186         cp = (struct g_consumer *)dev->si_drv2;
  187         error = g_access(cp, 1, 0, 0);
  188         if (error != 0)
  189                 return (error);
  190 
  191         error = g_dev_setdumpdev(dev, &kda, curthread);
  192         if (error == 0) {
  193                 freeenv(dumpdev);
  194                 dumpdev = NULL;
  195         }
  196 
  197         (void)g_access(cp, -1, 0, 0);
  198 
  199         return (error);
  200 }
  201 
  202 static void
  203 g_dev_destroy(void *arg, int flags __unused)
  204 {
  205         struct g_consumer *cp;
  206         struct g_geom *gp;
  207         struct g_dev_softc *sc;
  208         char buf[SPECNAMELEN + 6];
  209 
  210         g_topology_assert();
  211         cp = arg;
  212         gp = cp->geom;
  213         sc = cp->private;
  214         g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name);
  215         snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
  216         devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK);
  217         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
  218                 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
  219         g_detach(cp);
  220         g_destroy_consumer(cp);
  221         g_destroy_geom(gp);
  222         mtx_destroy(&sc->sc_mtx);
  223         g_free(sc);
  224 }
  225 
  226 void
  227 g_dev_print(void)
  228 {
  229         struct g_geom *gp;
  230         char const *p = "";
  231 
  232         LIST_FOREACH(gp, &g_dev_class.geom, geom) {
  233                 printf("%s%s", p, gp->name);
  234                 p = " ";
  235         }
  236         printf("\n");
  237 }
  238 
  239 static void
  240 g_dev_set_physpath(struct g_consumer *cp)
  241 {
  242         struct g_dev_softc *sc;
  243         char *physpath;
  244         int error, physpath_len;
  245 
  246         if (g_access(cp, 1, 0, 0) != 0)
  247                 return;
  248 
  249         sc = cp->private;
  250         physpath_len = MAXPATHLEN;
  251         physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
  252         error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
  253         g_access(cp, -1, 0, 0);
  254         if (error == 0 && strlen(physpath) != 0) {
  255                 struct cdev *dev, *old_alias_dev;
  256                 struct cdev **alias_devp;
  257 
  258                 dev = sc->sc_dev;
  259                 old_alias_dev = sc->sc_alias;
  260                 alias_devp = (struct cdev **)&sc->sc_alias;
  261                 make_dev_physpath_alias(MAKEDEV_WAITOK | MAKEDEV_CHECKNAME,
  262                     alias_devp, dev, old_alias_dev, physpath);
  263         } else if (sc->sc_alias) {
  264                 destroy_dev((struct cdev *)sc->sc_alias);
  265                 sc->sc_alias = NULL;
  266         }
  267         g_free(physpath);
  268 }
  269 
  270 static void
  271 g_dev_set_media(struct g_consumer *cp)
  272 {
  273         struct g_dev_softc *sc;
  274         struct cdev *dev;
  275         char buf[SPECNAMELEN + 6];
  276 
  277         sc = cp->private;
  278         dev = sc->sc_dev;
  279         snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
  280         devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK);
  281         devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK);
  282         dev = sc->sc_alias;
  283         if (dev != NULL) {
  284                 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
  285                 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK);
  286                 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK);
  287         }
  288 }
  289 
  290 static void
  291 g_dev_attrchanged(struct g_consumer *cp, const char *attr)
  292 {
  293 
  294         if (strcmp(attr, "GEOM::media") == 0) {
  295                 g_dev_set_media(cp);
  296                 return;
  297         }
  298 
  299         if (strcmp(attr, "GEOM::physpath") == 0) {
  300                 g_dev_set_physpath(cp);
  301                 return;
  302         }
  303 }
  304 
  305 struct g_provider *
  306 g_dev_getprovider(struct cdev *dev)
  307 {
  308         struct g_consumer *cp;
  309 
  310         g_topology_assert();
  311         if (dev == NULL)
  312                 return (NULL);
  313         if (dev->si_devsw != &g_dev_cdevsw)
  314                 return (NULL);
  315         cp = dev->si_drv2;
  316         return (cp->provider);
  317 }
  318 
  319 static struct g_geom *
  320 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
  321 {
  322         struct g_geom *gp;
  323         struct g_geom_alias *gap;
  324         struct g_consumer *cp;
  325         struct g_dev_softc *sc;
  326         int error;
  327         struct cdev *dev, *adev;
  328         char buf[SPECNAMELEN + 6];
  329         struct make_dev_args args;
  330 
  331         g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
  332         g_topology_assert();
  333         gp = g_new_geomf(mp, "%s", pp->name);
  334         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  335         mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF);
  336         cp = g_new_consumer(gp);
  337         cp->private = sc;
  338         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
  339         error = g_attach(cp, pp);
  340         KASSERT(error == 0,
  341             ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
  342 
  343         make_dev_args_init(&args);
  344         args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
  345         args.mda_devsw = &g_dev_cdevsw;
  346         args.mda_cr = NULL;
  347         args.mda_uid = UID_ROOT;
  348         args.mda_gid = GID_OPERATOR;
  349         args.mda_mode = 0640;
  350         args.mda_si_drv1 = sc;
  351         args.mda_si_drv2 = cp;
  352         error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name);
  353         if (error != 0) {
  354                 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
  355                     __func__, gp->name, error);
  356                 g_detach(cp);
  357                 g_destroy_consumer(cp);
  358                 g_destroy_geom(gp);
  359                 mtx_destroy(&sc->sc_mtx);
  360                 g_free(sc);
  361                 return (NULL);
  362         }
  363         dev = sc->sc_dev;
  364         dev->si_flags |= SI_UNMAPPED;
  365         dev->si_iosize_max = MAXPHYS;
  366         error = init_dumpdev(dev);
  367         if (error != 0)
  368                 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n",
  369                     __func__, gp->name, error);
  370 
  371         g_dev_attrchanged(cp, "GEOM::physpath");
  372         snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
  373         devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK);
  374         /*
  375          * Now add all the aliases for this drive
  376          */
  377         LIST_FOREACH(gap, &pp->geom->aliases, ga_next) {
  378                 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev,
  379                     "%s", gap->ga_alias);
  380                 if (error) {
  381                         printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n",
  382                             __func__, gap->ga_alias, error);
  383                         continue;
  384                 }
  385                 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias);
  386                 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK);
  387         }
  388 
  389         return (gp);
  390 }
  391 
  392 static int
  393 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
  394 {
  395         struct g_consumer *cp;
  396         struct g_dev_softc *sc;
  397         int error, r, w, e;
  398 
  399         cp = dev->si_drv2;
  400         g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
  401             cp->geom->name, flags, fmt, td);
  402 
  403         r = flags & FREAD ? 1 : 0;
  404         w = flags & FWRITE ? 1 : 0;
  405 #ifdef notyet
  406         e = flags & O_EXCL ? 1 : 0;
  407 #else
  408         e = 0;
  409 #endif
  410 
  411         /*
  412          * This happens on attempt to open a device node with O_EXEC.
  413          */
  414         if (r + w + e == 0)
  415                 return (EINVAL);
  416 
  417         if (w) {
  418                 /*
  419                  * When running in very secure mode, do not allow
  420                  * opens for writing of any disks.
  421                  */
  422                 error = securelevel_ge(td->td_ucred, 2);
  423                 if (error)
  424                         return (error);
  425         }
  426         g_topology_lock();
  427         error = g_access(cp, r, w, e);
  428         g_topology_unlock();
  429         if (error == 0) {
  430                 sc = dev->si_drv1;
  431                 mtx_lock(&sc->sc_mtx);
  432                 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0)
  433                         wakeup(&sc->sc_active);
  434                 sc->sc_open += r + w + e;
  435                 if (sc->sc_open == 0)
  436                         atomic_clear_int(&sc->sc_active, SC_A_OPEN);
  437                 else
  438                         atomic_set_int(&sc->sc_active, SC_A_OPEN);
  439                 mtx_unlock(&sc->sc_mtx);
  440         }
  441         return (error);
  442 }
  443 
  444 static int
  445 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
  446 {
  447         struct g_consumer *cp;
  448         struct g_dev_softc *sc;
  449         int error, r, w, e;
  450 
  451         cp = dev->si_drv2;
  452         g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
  453             cp->geom->name, flags, fmt, td);
  454 
  455         r = flags & FREAD ? -1 : 0;
  456         w = flags & FWRITE ? -1 : 0;
  457 #ifdef notyet
  458         e = flags & O_EXCL ? -1 : 0;
  459 #else
  460         e = 0;
  461 #endif
  462 
  463         /*
  464          * The vgonel(9) - caused by eg. forced unmount of devfs - calls
  465          * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags,
  466          * which would result in zero deltas, which in turn would cause
  467          * panic in g_access(9).
  468          *
  469          * Note that we cannot zero the counters (ie. do "r = cp->acr"
  470          * etc) instead, because the consumer might be opened in another
  471          * devfs instance.
  472          */
  473         if (r + w + e == 0)
  474                 return (EINVAL);
  475 
  476         sc = dev->si_drv1;
  477         mtx_lock(&sc->sc_mtx);
  478         sc->sc_open += r + w + e;
  479         if (sc->sc_open == 0)
  480                 atomic_clear_int(&sc->sc_active, SC_A_OPEN);
  481         else
  482                 atomic_set_int(&sc->sc_active, SC_A_OPEN);
  483         while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0)
  484                 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10);
  485         mtx_unlock(&sc->sc_mtx);
  486         g_topology_lock();
  487         error = g_access(cp, r, w, e);
  488         g_topology_unlock();
  489         return (error);
  490 }
  491 
  492 static int
  493 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
  494 {
  495         struct g_consumer *cp;
  496         struct g_provider *pp;
  497         off_t offset, length, chunk, odd;
  498         int i, error;
  499 
  500         cp = dev->si_drv2;
  501         pp = cp->provider;
  502 
  503         /* If consumer or provider is dying, don't disturb. */
  504         if (cp->flags & G_CF_ORPHAN)
  505                 return (ENXIO);
  506         if (pp->error)
  507                 return (pp->error);
  508 
  509         error = 0;
  510         KASSERT(cp->acr || cp->acw,
  511             ("Consumer with zero access count in g_dev_ioctl"));
  512 
  513         i = IOCPARM_LEN(cmd);
  514         switch (cmd) {
  515         case DIOCGSECTORSIZE:
  516                 *(u_int *)data = pp->sectorsize;
  517                 if (*(u_int *)data == 0)
  518                         error = ENOENT;
  519                 break;
  520         case DIOCGMEDIASIZE:
  521                 *(off_t *)data = pp->mediasize;
  522                 if (*(off_t *)data == 0)
  523                         error = ENOENT;
  524                 break;
  525         case DIOCGFWSECTORS:
  526                 error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
  527                 if (error == 0 && *(u_int *)data == 0)
  528                         error = ENOENT;
  529                 break;
  530         case DIOCGFWHEADS:
  531                 error = g_io_getattr("GEOM::fwheads", cp, &i, data);
  532                 if (error == 0 && *(u_int *)data == 0)
  533                         error = ENOENT;
  534                 break;
  535         case DIOCGFRONTSTUFF:
  536                 error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
  537                 break;
  538 #ifdef COMPAT_FREEBSD11
  539         case DIOCSKERNELDUMP_FREEBSD11:
  540             {
  541                 struct diocskerneldump_arg kda;
  542 
  543                 bzero(&kda, sizeof(kda));
  544                 kda.kda_encryption = KERNELDUMP_ENC_NONE;
  545                 kda.kda_enable = (uint8_t)*(u_int *)data;
  546                 if (kda.kda_enable == 0)
  547                         error = g_dev_setdumpdev(NULL, NULL, td);
  548                 else
  549                         error = g_dev_setdumpdev(dev, &kda, td);
  550                 break;
  551             }
  552 #endif
  553         case DIOCSKERNELDUMP:
  554             {
  555                 struct diocskerneldump_arg *kda;
  556                 uint8_t *encryptedkey;
  557 
  558                 kda = (struct diocskerneldump_arg *)data;
  559                 if (kda->kda_enable == 0) {
  560                         error = g_dev_setdumpdev(NULL, NULL, td);
  561                         break;
  562                 }
  563 
  564                 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) {
  565                         if (kda->kda_encryptedkeysize <= 0 ||
  566                             kda->kda_encryptedkeysize >
  567                             KERNELDUMP_ENCKEY_MAX_SIZE) {
  568                                 return (EINVAL);
  569                         }
  570                         encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP,
  571                             M_WAITOK);
  572                         error = copyin(kda->kda_encryptedkey, encryptedkey,
  573                             kda->kda_encryptedkeysize);
  574                 } else {
  575                         encryptedkey = NULL;
  576                 }
  577                 if (error == 0) {
  578                         kda->kda_encryptedkey = encryptedkey;
  579                         error = g_dev_setdumpdev(dev, kda, td);
  580                 }
  581                 if (encryptedkey != NULL) {
  582                         explicit_bzero(encryptedkey, kda->kda_encryptedkeysize);
  583                         free(encryptedkey, M_TEMP);
  584                 }
  585                 explicit_bzero(kda, sizeof(*kda));
  586                 break;
  587             }
  588         case DIOCGFLUSH:
  589                 error = g_io_flush(cp);
  590                 break;
  591         case DIOCGDELETE:
  592                 offset = ((off_t *)data)[0];
  593                 length = ((off_t *)data)[1];
  594                 if ((offset % pp->sectorsize) != 0 ||
  595                     (length % pp->sectorsize) != 0 || length <= 0) {
  596                         printf("%s: offset=%jd length=%jd\n", __func__, offset,
  597                             length);
  598                         error = EINVAL;
  599                         break;
  600                 }
  601                 while (length > 0) {
  602                         chunk = length;
  603                         if (g_dev_del_max_sectors != 0 &&
  604                             chunk > g_dev_del_max_sectors * pp->sectorsize) {
  605                                 chunk = g_dev_del_max_sectors * pp->sectorsize;
  606                                 if (pp->stripesize > 0) {
  607                                         odd = (offset + chunk +
  608                                             pp->stripeoffset) % pp->stripesize;
  609                                         if (chunk > odd)
  610                                                 chunk -= odd;
  611                                 }
  612                         }
  613                         error = g_delete_data(cp, offset, chunk);
  614                         length -= chunk;
  615                         offset += chunk;
  616                         if (error)
  617                                 break;
  618                         /*
  619                          * Since the request size can be large, the service
  620                          * time can be is likewise.  We make this ioctl
  621                          * interruptible by checking for signals for each bio.
  622                          */
  623                         if (SIGPENDING(td))
  624                                 break;
  625                 }
  626                 break;
  627         case DIOCGIDENT:
  628                 error = g_io_getattr("GEOM::ident", cp, &i, data);
  629                 break;
  630         case DIOCGPROVIDERNAME:
  631                 strlcpy(data, pp->name, i);
  632                 break;
  633         case DIOCGSTRIPESIZE:
  634                 *(off_t *)data = pp->stripesize;
  635                 break;
  636         case DIOCGSTRIPEOFFSET:
  637                 *(off_t *)data = pp->stripeoffset;
  638                 break;
  639         case DIOCGPHYSPATH:
  640                 error = g_io_getattr("GEOM::physpath", cp, &i, data);
  641                 if (error == 0 && *(char *)data == '\0')
  642                         error = ENOENT;
  643                 break;
  644         case DIOCGATTR: {
  645                 struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
  646 
  647                 if (arg->len > sizeof(arg->value)) {
  648                         error = EINVAL;
  649                         break;
  650                 }
  651                 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value);
  652                 break;
  653         }
  654         case DIOCZONECMD: {
  655                 struct disk_zone_args *zone_args =(struct disk_zone_args *)data;
  656                 struct disk_zone_rep_entry *new_entries, *old_entries;
  657                 struct disk_zone_report *rep;
  658                 size_t alloc_size;
  659 
  660                 old_entries = NULL;
  661                 new_entries = NULL;
  662                 rep = NULL;
  663                 alloc_size = 0;
  664 
  665                 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) {
  666                         rep = &zone_args->zone_params.report;
  667 #define MAXENTRIES      (MAXPHYS / sizeof(struct disk_zone_rep_entry))
  668                         if (rep->entries_allocated > MAXENTRIES)
  669                                 rep->entries_allocated = MAXENTRIES;
  670                         alloc_size = rep->entries_allocated *
  671                             sizeof(struct disk_zone_rep_entry);
  672                         if (alloc_size != 0)
  673                                 new_entries = g_malloc(alloc_size,
  674                                     M_WAITOK| M_ZERO);
  675                         old_entries = rep->entries;
  676                         rep->entries = new_entries;
  677                 }
  678                 error = g_io_zonecmd(zone_args, cp);
  679                 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES &&
  680                     alloc_size != 0 && error == 0)
  681                         error = copyout(new_entries, old_entries, alloc_size);
  682                 if (old_entries != NULL && rep != NULL)
  683                         rep->entries = old_entries;
  684                 if (new_entries != NULL)
  685                         g_free(new_entries);
  686                 break;
  687         }
  688         default:
  689                 if (pp->geom->ioctl != NULL) {
  690                         error = pp->geom->ioctl(pp, cmd, data, fflag, td);
  691                 } else {
  692                         error = ENOIOCTL;
  693                 }
  694         }
  695 
  696         return (error);
  697 }
  698 
  699 static void
  700 g_dev_done(struct bio *bp2)
  701 {
  702         struct g_consumer *cp;
  703         struct g_dev_softc *sc;
  704         struct bio *bp;
  705         int active;
  706 
  707         cp = bp2->bio_from;
  708         sc = cp->private;
  709         bp = bp2->bio_parent;
  710         bp->bio_error = bp2->bio_error;
  711         bp->bio_completed = bp2->bio_completed;
  712         bp->bio_resid = bp->bio_length - bp2->bio_completed;
  713         if (bp2->bio_cmd == BIO_ZONE)
  714                 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone));
  715 
  716         if (bp2->bio_error != 0) {
  717                 g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
  718                     bp2, bp2->bio_error);
  719                 bp->bio_flags |= BIO_ERROR;
  720         } else {
  721                 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
  722                     bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
  723         }
  724         g_destroy_bio(bp2);
  725         active = atomic_fetchadd_int(&sc->sc_active, -1) - 1;
  726         if ((active & SC_A_ACTIVE) == 0) {
  727                 if ((active & SC_A_OPEN) == 0)
  728                         wakeup(&sc->sc_active);
  729                 if (active & SC_A_DESTROY)
  730                         g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL);
  731         }
  732         biodone(bp);
  733 }
  734 
  735 static void
  736 g_dev_strategy(struct bio *bp)
  737 {
  738         struct g_consumer *cp;
  739         struct bio *bp2;
  740         struct cdev *dev;
  741         struct g_dev_softc *sc;
  742 
  743         KASSERT(bp->bio_cmd == BIO_READ ||
  744                 bp->bio_cmd == BIO_WRITE ||
  745                 bp->bio_cmd == BIO_DELETE ||
  746                 bp->bio_cmd == BIO_FLUSH ||
  747                 bp->bio_cmd == BIO_ZONE,
  748                 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
  749         dev = bp->bio_dev;
  750         cp = dev->si_drv2;
  751         KASSERT(cp->acr || cp->acw,
  752             ("Consumer with zero access count in g_dev_strategy"));
  753         biotrack(bp, __func__);
  754 #ifdef INVARIANTS
  755         if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
  756             (bp->bio_bcount % cp->provider->sectorsize) != 0) {
  757                 bp->bio_resid = bp->bio_bcount;
  758                 biofinish(bp, NULL, EINVAL);
  759                 return;
  760         }
  761 #endif
  762         sc = dev->si_drv1;
  763         KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
  764         atomic_add_int(&sc->sc_active, 1);
  765 
  766         for (;;) {
  767                 /*
  768                  * XXX: This is not an ideal solution, but I believe it to
  769                  * XXX: deadlock safely, all things considered.
  770                  */
  771                 bp2 = g_clone_bio(bp);
  772                 if (bp2 != NULL)
  773                         break;
  774                 pause("gdstrat", hz / 10);
  775         }
  776         KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
  777         bp2->bio_done = g_dev_done;
  778         g_trace(G_T_BIO,
  779             "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
  780             bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
  781             bp2->bio_data, bp2->bio_cmd);
  782         g_io_request(bp2, cp);
  783         KASSERT(cp->acr || cp->acw,
  784             ("g_dev_strategy raced with g_dev_close and lost"));
  785 
  786 }
  787 
  788 /*
  789  * g_dev_callback()
  790  *
  791  * Called by devfs when asynchronous device destruction is completed.
  792  * - Mark that we have no attached device any more.
  793  * - If there are no outstanding requests, schedule geom destruction.
  794  *   Otherwise destruction will be scheduled later by g_dev_done().
  795  */
  796 
  797 static void
  798 g_dev_callback(void *arg)
  799 {
  800         struct g_consumer *cp;
  801         struct g_dev_softc *sc;
  802         int active;
  803 
  804         cp = arg;
  805         sc = cp->private;
  806         g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
  807 
  808         sc->sc_dev = NULL;
  809         sc->sc_alias = NULL;
  810         active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY);
  811         if ((active & SC_A_ACTIVE) == 0)
  812                 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
  813 }
  814 
  815 /*
  816  * g_dev_orphan()
  817  *
  818  * Called from below when the provider orphaned us.
  819  * - Clear any dump settings.
  820  * - Request asynchronous device destruction to prevent any more requests
  821  *   from coming in.  The provider is already marked with an error, so
  822  *   anything which comes in the interim will be returned immediately.
  823  */
  824 
  825 static void
  826 g_dev_orphan(struct g_consumer *cp)
  827 {
  828         struct cdev *dev;
  829         struct g_dev_softc *sc;
  830 
  831         g_topology_assert();
  832         sc = cp->private;
  833         dev = sc->sc_dev;
  834         g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
  835 
  836         /* Reset any dump-area set on this device */
  837         if (dev->si_flags & SI_DUMPDEV)
  838                 (void)clear_dumper(curthread);
  839 
  840         /* Destroy the struct cdev *so we get no more requests */
  841         delist_dev(dev);
  842         destroy_dev_sched_cb(dev, g_dev_callback, cp);
  843 }
  844 
  845 DECLARE_GEOM_CLASS(g_dev_class, g_dev);

Cache object: 20006d2325095d604d12bfe4797ab683


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.