sys/geom/nop/g_nop.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   5  * Copyright (c) 2019 Mariusz Zaborski <oshogbo@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/ctype.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/module.h>
  38 #include <sys/lock.h>
  39 #include <sys/mutex.h>
  40 #include <sys/bio.h>
  41 #include <sys/sbuf.h>
  42 #include <sys/sysctl.h>
  43 #include <sys/malloc.h>
  44 #include <geom/geom.h>
  45 #include <geom/geom_dbg.h>
  46 #include <geom/nop/g_nop.h>
  47
  48
  49 SYSCTL_DECL(_kern_geom);
  50 static SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff");
  51 static u_int g_nop_debug = 0;
  52 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
  53     "Debug level");
  54
  55 static int g_nop_destroy(struct g_geom *gp, boolean_t force);
  56 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
  57     struct g_geom *gp);
  58 static void g_nop_config(struct gctl_req *req, struct g_class *mp,
  59     const char *verb);
  60 static g_access_t g_nop_access;
  61 static g_dumpconf_t g_nop_dumpconf;
  62 static g_orphan_t g_nop_orphan;
  63 static g_provgone_t g_nop_providergone;
  64 static g_resize_t g_nop_resize;
  65 static g_start_t g_nop_start;
  66
  67 struct g_class g_nop_class = {
  68         .name = G_NOP_CLASS_NAME,
  69         .version = G_VERSION,
  70         .ctlreq = g_nop_config,
  71         .destroy_geom = g_nop_destroy_geom,
  72         .access = g_nop_access,
  73         .dumpconf = g_nop_dumpconf,
  74         .orphan = g_nop_orphan,
  75         .providergone = g_nop_providergone,
  76         .resize = g_nop_resize,
  77         .start = g_nop_start,
  78 };
  79
  80 struct g_nop_delay {
  81         struct callout                   dl_cal;
  82         struct bio                      *dl_bio;
  83         TAILQ_ENTRY(g_nop_delay)         dl_next;
  84 };
  85
  86 static bool
  87 g_nop_verify_nprefix(const char *name)
  88 {
  89         int i;
  90
  91         for (i = 0; i < strlen(name); i++) {
  92                 if (isalpha(name[i]) == 0 && isdigit(name[i]) == 0) {
  93                         return (false);
  94                 }
  95         }
  96
  97         return (true);
  98 }
  99
 100 static void
 101 g_nop_orphan(struct g_consumer *cp)
 102 {
 103
 104         g_topology_assert();
 105         g_nop_destroy(cp->geom, 1);
 106 }
 107
 108 static void
 109 g_nop_resize(struct g_consumer *cp)
 110 {
 111         struct g_nop_softc *sc;
 112         struct g_geom *gp;
 113         struct g_provider *pp;
 114         off_t size;
 115
 116         g_topology_assert();
 117
 118         gp = cp->geom;
 119         sc = gp->softc;
 120
 121         if (sc->sc_explicitsize != 0)
 122                 return;
 123         if (cp->provider->mediasize < sc->sc_offset) {
 124                 g_nop_destroy(gp, 1);
 125                 return;
 126         }
 127         size = cp->provider->mediasize - sc->sc_offset;
 128         LIST_FOREACH(pp, &gp->provider, provider)
 129                 g_resize_provider(pp, size);
 130 }
 131
 132 static int
 133 g_nop_dumper(void *priv, void *virtual, vm_offset_t physical, off_t offset,
 134     size_t length)
 135 {
 136
 137         return (0);
 138 }
 139
 140 static void
 141 g_nop_kerneldump(struct bio *bp, struct g_nop_softc *sc)
 142 {
 143         struct g_kerneldump *gkd;
 144         struct g_geom *gp;
 145         struct g_provider *pp;
 146
 147         gkd = (struct g_kerneldump *)bp->bio_data;
 148         gp = bp->bio_to->geom;
 149         g_trace(G_T_TOPOLOGY, "%s(%s, %jd, %jd)", __func__, gp->name,
 150             (intmax_t)gkd->offset, (intmax_t)gkd->length);
 151
 152         pp = LIST_FIRST(&gp->provider);
 153
 154         gkd->di.dumper = g_nop_dumper;
 155         gkd->di.priv = sc;
 156         gkd->di.blocksize = pp->sectorsize;
 157         gkd->di.maxiosize = DFLTPHYS;
 158         gkd->di.mediaoffset = sc->sc_offset + gkd->offset;
 159         if (gkd->offset > sc->sc_explicitsize) {
 160                 g_io_deliver(bp, ENODEV);
 161                 return;
 162         }
 163         if (gkd->offset + gkd->length > sc->sc_explicitsize)
 164                 gkd->length = sc->sc_explicitsize - gkd->offset;
 165         gkd->di.mediasize = gkd->length;
 166         g_io_deliver(bp, 0);
 167 }
 168
 169 static void
 170 g_nop_pass(struct bio *cbp, struct g_geom *gp)
 171 {
 172
 173         G_NOP_LOGREQ(cbp, "Sending request.");
 174         g_io_request(cbp, LIST_FIRST(&gp->consumer));
 175 }
 176
 177 static void
 178 g_nop_pass_timeout(void *data)
 179 {
 180         struct g_nop_softc *sc;
 181         struct g_geom *gp;
 182         struct g_nop_delay *gndelay;
 183
 184         gndelay = (struct g_nop_delay *)data;
 185
 186         gp = gndelay->dl_bio->bio_to->geom;
 187         sc = gp->softc;
 188
 189         mtx_lock(&sc->sc_lock);
 190         TAILQ_REMOVE(&sc->sc_head_delay, gndelay, dl_next);
 191         mtx_unlock(&sc->sc_lock);
 192
 193         g_nop_pass(gndelay->dl_bio, gp);
 194
 195         g_free(data);
 196 }
 197
 198 static void
 199 g_nop_start(struct bio *bp)
 200 {
 201         struct g_nop_softc *sc;
 202         struct g_geom *gp;
 203         struct g_provider *pp;
 204         struct bio *cbp;
 205         u_int failprob, delayprob, delaytime;
 206
 207         failprob = delayprob = delaytime = 0;
 208
 209         gp = bp->bio_to->geom;
 210         sc = gp->softc;
 211
 212         G_NOP_LOGREQ(bp, "Request received.");
 213         mtx_lock(&sc->sc_lock);
 214         switch (bp->bio_cmd) {
 215         case BIO_READ:
 216                 sc->sc_reads++;
 217                 sc->sc_readbytes += bp->bio_length;
 218                 if (sc->sc_count_until_fail != 0) {
 219                         sc->sc_count_until_fail -= 1;
 220                 } else {
 221                         failprob = sc->sc_rfailprob;
 222                         delayprob = sc->sc_rdelayprob;
 223                         delaytime = sc->sc_delaymsec;
 224                 }
 225                 break;
 226         case BIO_WRITE:
 227                 sc->sc_writes++;
 228                 sc->sc_wrotebytes += bp->bio_length;
 229                 if (sc->sc_count_until_fail != 0) {
 230                         sc->sc_count_until_fail -= 1;
 231                 } else {
 232                         failprob = sc->sc_wfailprob;
 233                         delayprob = sc->sc_wdelayprob;
 234                         delaytime = sc->sc_delaymsec;
 235                 }
 236                 break;
 237         case BIO_DELETE:
 238                 sc->sc_deletes++;
 239                 break;
 240         case BIO_GETATTR:
 241                 sc->sc_getattrs++;
 242                 if (sc->sc_physpath &&
 243                     g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath))
 244                         ;
 245                 else if (strcmp(bp->bio_attribute, "GEOM::kerneldump") == 0)
 246                         g_nop_kerneldump(bp, sc);
 247                 else
 248                         /*
 249                          * Fallthrough to forwarding the GETATTR down to the
 250                          * lower level device.
 251                          */
 252                         break;
 253                 mtx_unlock(&sc->sc_lock);
 254                 return;
 255         case BIO_FLUSH:
 256                 sc->sc_flushes++;
 257                 break;
 258         case BIO_SPEEDUP:
 259                 sc->sc_speedups++;
 260                 break;
 261         case BIO_CMD0:
 262                 sc->sc_cmd0s++;
 263                 break;
 264         case BIO_CMD1:
 265                 sc->sc_cmd1s++;
 266                 break;
 267         case BIO_CMD2:
 268                 sc->sc_cmd2s++;
 269                 break;
 270         }
 271         mtx_unlock(&sc->sc_lock);
 272
 273         if (failprob > 0) {
 274                 u_int rval;
 275
 276                 rval = arc4random() % 100;
 277                 if (rval < failprob) {
 278                         G_NOP_LOGREQLVL(1, bp, "Returning error=%d.", sc->sc_error);
 279                         g_io_deliver(bp, sc->sc_error);
 280                         return;
 281                 }
 282         }
 283
 284         cbp = g_clone_bio(bp);
 285         if (cbp == NULL) {
 286                 g_io_deliver(bp, ENOMEM);
 287                 return;
 288         }
 289         cbp->bio_done = g_std_done;
 290         cbp->bio_offset = bp->bio_offset + sc->sc_offset;
 291         pp = LIST_FIRST(&gp->provider);
 292         KASSERT(pp != NULL, ("NULL pp"));
 293         cbp->bio_to = pp;
 294
 295         if (delayprob > 0) {
 296                 struct g_nop_delay *gndelay;
 297                 u_int rval;
 298
 299                 rval = arc4random() % 100;
 300                 if (rval < delayprob) {
 301                         gndelay = g_malloc(sizeof(*gndelay), M_NOWAIT | M_ZERO);
 302                         if (gndelay != NULL) {
 303                                 callout_init(&gndelay->dl_cal, 1);
 304
 305                                 gndelay->dl_bio = cbp;
 306
 307                                 mtx_lock(&sc->sc_lock);
 308                                 TAILQ_INSERT_TAIL(&sc->sc_head_delay, gndelay,
 309                                     dl_next);
 310                                 mtx_unlock(&sc->sc_lock);
 311
 312                                 callout_reset(&gndelay->dl_cal,
 313                                     MSEC_2_TICKS(delaytime), g_nop_pass_timeout,
 314                                     gndelay);
 315                                 return;
 316                         }
 317                 }
 318         }
 319
 320         g_nop_pass(cbp, gp);
 321 }
 322
 323 static int
 324 g_nop_access(struct g_provider *pp, int dr, int dw, int de)
 325 {
 326         struct g_geom *gp;
 327         struct g_consumer *cp;
 328         int error;
 329
 330         gp = pp->geom;
 331         cp = LIST_FIRST(&gp->consumer);
 332         error = g_access(cp, dr, dw, de);
 333
 334         return (error);
 335 }
 336
 337 static int
 338 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 339     const char *gnopname, int ioerror, u_int count_until_fail,
 340     u_int rfailprob, u_int wfailprob, u_int delaymsec, u_int rdelayprob,
 341     u_int wdelayprob, off_t offset, off_t size, u_int secsize, off_t stripesize,
 342     off_t stripeoffset, const char *physpath)
 343 {
 344         struct g_nop_softc *sc;
 345         struct g_geom *gp;
 346         struct g_provider *newpp;
 347         struct g_consumer *cp;
 348         char name[64];
 349         int error, n;
 350         off_t explicitsize;
 351
 352         g_topology_assert();
 353
 354         gp = NULL;
 355         newpp = NULL;
 356         cp = NULL;
 357
 358         if ((offset % pp->sectorsize) != 0) {
 359                 gctl_error(req, "Invalid offset for provider %s.", pp->name);
 360                 return (EINVAL);
 361         }
 362         if ((size % pp->sectorsize) != 0) {
 363                 gctl_error(req, "Invalid size for provider %s.", pp->name);
 364                 return (EINVAL);
 365         }
 366         if (offset >= pp->mediasize) {
 367                 gctl_error(req, "Invalid offset for provider %s.", pp->name);
 368                 return (EINVAL);
 369         }
 370         explicitsize = size;
 371         if (size == 0)
 372                 size = pp->mediasize - offset;
 373         if (offset + size > pp->mediasize) {
 374                 gctl_error(req, "Invalid size for provider %s.", pp->name);
 375                 return (EINVAL);
 376         }
 377         if (secsize == 0)
 378                 secsize = pp->sectorsize;
 379         else if ((secsize % pp->sectorsize) != 0) {
 380                 gctl_error(req, "Invalid secsize for provider %s.", pp->name);
 381                 return (EINVAL);
 382         }
 383         if (secsize > MAXPHYS) {
 384                 gctl_error(req, "secsize is too big.");
 385                 return (EINVAL);
 386         }
 387         size -= size % secsize;
 388         if ((stripesize % pp->sectorsize) != 0) {
 389                 gctl_error(req, "Invalid stripesize for provider %s.", pp->name);
 390                 return (EINVAL);
 391         }
 392         if ((stripeoffset % pp->sectorsize) != 0) {
 393                 gctl_error(req, "Invalid stripeoffset for provider %s.", pp->name);
 394                 return (EINVAL);
 395         }
 396         if (stripesize != 0 && stripeoffset >= stripesize) {
 397                 gctl_error(req, "stripeoffset is too big.");
 398                 return (EINVAL);
 399         }
 400         if (gnopname != NULL && !g_nop_verify_nprefix(gnopname)) {
 401                 gctl_error(req, "Name %s is invalid.", gnopname);
 402                 return (EINVAL);
 403         }
 404
 405         if (gnopname != NULL) {
 406                 n = snprintf(name, sizeof(name), "%s%s", gnopname,
 407                     G_NOP_SUFFIX);
 408         } else {
 409                 n = snprintf(name, sizeof(name), "%s%s", pp->name,
 410                     G_NOP_SUFFIX);
 411         }
 412         if (n <= 0 || n >= sizeof(name)) {
 413                 gctl_error(req, "Invalid provider name.");
 414                 return (EINVAL);
 415         }
 416         LIST_FOREACH(gp, &mp->geom, geom) {
 417                 if (strcmp(gp->name, name) == 0) {
 418                         gctl_error(req, "Provider %s already exists.", name);
 419                         return (EEXIST);
 420                 }
 421         }
 422         gp = g_new_geomf(mp, "%s", name);
 423         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 424         sc->sc_offset = offset;
 425         sc->sc_explicitsize = explicitsize;
 426         sc->sc_stripesize = stripesize;
 427         sc->sc_stripeoffset = stripeoffset;
 428         if (physpath && strcmp(physpath, G_NOP_PHYSPATH_PASSTHROUGH)) {
 429                 sc->sc_physpath = strndup(physpath, MAXPATHLEN, M_GEOM);
 430         } else
 431                 sc->sc_physpath = NULL;
 432         sc->sc_error = ioerror;
 433         sc->sc_count_until_fail = count_until_fail;
 434         sc->sc_rfailprob = rfailprob;
 435         sc->sc_wfailprob = wfailprob;
 436         sc->sc_delaymsec = delaymsec;
 437         sc->sc_rdelayprob = rdelayprob;
 438         sc->sc_wdelayprob = wdelayprob;
 439         sc->sc_reads = 0;
 440         sc->sc_writes = 0;
 441         sc->sc_deletes = 0;
 442         sc->sc_getattrs = 0;
 443         sc->sc_flushes = 0;
 444         sc->sc_speedups = 0;
 445         sc->sc_cmd0s = 0;
 446         sc->sc_cmd1s = 0;
 447         sc->sc_cmd2s = 0;
 448         sc->sc_readbytes = 0;
 449         sc->sc_wrotebytes = 0;
 450         TAILQ_INIT(&sc->sc_head_delay);
 451         mtx_init(&sc->sc_lock, "gnop lock", NULL, MTX_DEF);
 452         gp->softc = sc;
 453
 454         newpp = g_new_providerf(gp, "%s", gp->name);
 455         newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
 456         newpp->mediasize = size;
 457         newpp->sectorsize = secsize;
 458         newpp->stripesize = stripesize;
 459         newpp->stripeoffset = stripeoffset;
 460
 461         cp = g_new_consumer(gp);
 462         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 463         error = g_attach(cp, pp);
 464         if (error != 0) {
 465                 gctl_error(req, "Cannot attach to provider %s.", pp->name);
 466                 goto fail;
 467         }
 468
 469         newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED;
 470         g_error_provider(newpp, 0);
 471         G_NOP_DEBUG(0, "Device %s created.", gp->name);
 472         return (0);
 473 fail:
 474         if (cp->provider != NULL)
 475                 g_detach(cp);
 476         g_destroy_consumer(cp);
 477         g_destroy_provider(newpp);
 478         mtx_destroy(&sc->sc_lock);
 479         free(sc->sc_physpath, M_GEOM);
 480         g_free(gp->softc);
 481         g_destroy_geom(gp);
 482         return (error);
 483 }
 484
 485 static void
 486 g_nop_providergone(struct g_provider *pp)
 487 {
 488         struct g_geom *gp = pp->geom;
 489         struct g_nop_softc *sc = gp->softc;
 490
 491         KASSERT(TAILQ_EMPTY(&sc->sc_head_delay),
 492             ("delayed request list is not empty"));
 493
 494         gp->softc = NULL;
 495         free(sc->sc_physpath, M_GEOM);
 496         mtx_destroy(&sc->sc_lock);
 497         g_free(sc);
 498 }
 499
 500 static int
 501 g_nop_destroy(struct g_geom *gp, boolean_t force)
 502 {
 503         struct g_nop_softc *sc;
 504         struct g_provider *pp;
 505
 506         g_topology_assert();
 507         sc = gp->softc;
 508         if (sc == NULL)
 509                 return (ENXIO);
 510         pp = LIST_FIRST(&gp->provider);
 511         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 512                 if (force) {
 513                         G_NOP_DEBUG(0, "Device %s is still open, so it "
 514                             "can't be definitely removed.", pp->name);
 515                 } else {
 516                         G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
 517                             pp->name, pp->acr, pp->acw, pp->ace);
 518                         return (EBUSY);
 519                 }
 520         } else {
 521                 G_NOP_DEBUG(0, "Device %s removed.", gp->name);
 522         }
 523
 524         g_wither_geom(gp, ENXIO);
 525
 526         return (0);
 527 }
 528
 529 static int
 530 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
 531 {
 532
 533         return (g_nop_destroy(gp, 0));
 534 }
 535
 536 static void
 537 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
 538 {
 539         struct g_provider *pp;
 540         intmax_t *val, error, rfailprob, wfailprob, count_until_fail, offset,
 541             secsize, size, stripesize, stripeoffset, delaymsec,
 542             rdelayprob, wdelayprob;
 543         const char *name, *physpath, *gnopname;
 544         char param[16];
 545         int i, *nargs;
 546
 547         g_topology_assert();
 548
 549         error = -1;
 550         rfailprob = -1;
 551         wfailprob = -1;
 552         count_until_fail = -1;
 553         offset = 0;
 554         secsize = 0;
 555         size = 0;
 556         stripesize = 0;
 557         stripeoffset = 0;
 558         delaymsec = -1;
 559         rdelayprob = -1;
 560         wdelayprob = -1;
 561
 562         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 563         if (nargs == NULL) {
 564                 gctl_error(req, "No '%s' argument", "nargs");
 565                 return;
 566         }
 567         if (*nargs <= 0) {
 568                 gctl_error(req, "Missing device(s).");
 569                 return;
 570         }
 571         val = gctl_get_paraml_opt(req, "error", sizeof(*val));
 572         if (val != NULL) {
 573                 error = *val;
 574         }
 575         val = gctl_get_paraml_opt(req, "rfailprob", sizeof(*val));
 576         if (val != NULL) {
 577                 rfailprob = *val;
 578                 if (rfailprob < -1 || rfailprob > 100) {
 579                         gctl_error(req, "Invalid '%s' argument", "rfailprob");
 580                         return;
 581                 }
 582         }
 583         val = gctl_get_paraml_opt(req, "wfailprob", sizeof(*val));
 584         if (val != NULL) {
 585                 wfailprob = *val;
 586                 if (wfailprob < -1 || wfailprob > 100) {
 587                         gctl_error(req, "Invalid '%s' argument", "wfailprob");
 588                         return;
 589                 }
 590         }
 591         val = gctl_get_paraml_opt(req, "delaymsec", sizeof(*val));
 592         if (val != NULL) {
 593                 delaymsec = *val;
 594                 if (delaymsec < 1 && delaymsec != -1) {
 595                         gctl_error(req, "Invalid '%s' argument", "delaymsec");
 596                         return;
 597                 }
 598         }
 599         val = gctl_get_paraml_opt(req, "rdelayprob", sizeof(*val));
 600         if (val != NULL) {
 601                 rdelayprob = *val;
 602                 if (rdelayprob < -1 || rdelayprob > 100) {
 603                         gctl_error(req, "Invalid '%s' argument", "rdelayprob");
 604                         return;
 605                 }
 606         }
 607         val = gctl_get_paraml_opt(req, "wdelayprob", sizeof(*val));
 608         if (val != NULL) {
 609                 wdelayprob = *val;
 610                 if (wdelayprob < -1 || wdelayprob > 100) {
 611                         gctl_error(req, "Invalid '%s' argument", "wdelayprob");
 612                         return;
 613                 }
 614         }
 615         val = gctl_get_paraml_opt(req, "count_until_fail", sizeof(*val));
 616         if (val != NULL) {
 617                 count_until_fail = *val;
 618                 if (count_until_fail < -1) {
 619                         gctl_error(req, "Invalid '%s' argument",
 620                             "count_until_fail");
 621                         return;
 622                 }
 623         }
 624         val = gctl_get_paraml_opt(req, "offset", sizeof(*val));
 625         if (val != NULL) {
 626                 offset = *val;
 627                 if (offset < 0) {
 628                         gctl_error(req, "Invalid '%s' argument", "offset");
 629                         return;
 630                 }
 631         }
 632         val = gctl_get_paraml_opt(req, "size", sizeof(*val));
 633         if (val != NULL) {
 634                 size = *val;
 635                 if (size < 0) {
 636                         gctl_error(req, "Invalid '%s' argument", "size");
 637                         return;
 638                 }
 639         }
 640         val = gctl_get_paraml_opt(req, "secsize", sizeof(*val));
 641         if (val != NULL) {
 642                 secsize = *val;
 643                 if (secsize < 0) {
 644                         gctl_error(req, "Invalid '%s' argument", "secsize");
 645                         return;
 646                 }
 647         }
 648         val = gctl_get_paraml_opt(req, "stripesize", sizeof(*val));
 649         if (val != NULL) {
 650                 stripesize = *val;
 651                 if (stripesize < 0) {
 652                         gctl_error(req, "Invalid '%s' argument", "stripesize");
 653                         return;
 654                 }
 655         }
 656         val = gctl_get_paraml_opt(req, "stripeoffset", sizeof(*val));
 657         if (val != NULL) {
 658                 stripeoffset = *val;
 659                 if (stripeoffset < 0) {
 660                         gctl_error(req, "Invalid '%s' argument",
 661                             "stripeoffset");
 662                         return;
 663                 }
 664         }
 665         physpath = gctl_get_asciiparam(req, "physpath");
 666         gnopname = gctl_get_asciiparam(req, "gnopname");
 667
 668         for (i = 0; i < *nargs; i++) {
 669                 snprintf(param, sizeof(param), "arg%d", i);
 670                 name = gctl_get_asciiparam(req, param);
 671                 if (name == NULL) {
 672                         gctl_error(req, "No 'arg%d' argument", i);
 673                         return;
 674                 }
 675                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 676                         name += strlen("/dev/");
 677                 pp = g_provider_by_name(name);
 678                 if (pp == NULL) {
 679                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 680                         gctl_error(req, "Provider %s is invalid.", name);
 681                         return;
 682                 }
 683                 if (g_nop_create(req, mp, pp,
 684                     gnopname,
 685                     error == -1 ? EIO : (int)error,
 686                     count_until_fail == -1 ? 0 : (u_int)count_until_fail,
 687                     rfailprob == -1 ? 0 : (u_int)rfailprob,
 688                     wfailprob == -1 ? 0 : (u_int)wfailprob,
 689                     delaymsec == -1 ? 1 : (u_int)delaymsec,
 690                     rdelayprob == -1 ? 0 : (u_int)rdelayprob,
 691                     wdelayprob == -1 ? 0 : (u_int)wdelayprob,
 692                     (off_t)offset, (off_t)size, (u_int)secsize,
 693                     (off_t)stripesize, (off_t)stripeoffset,
 694                     physpath) != 0) {
 695                         return;
 696                 }
 697         }
 698 }
 699
 700 static void
 701 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
 702 {
 703         struct g_nop_softc *sc;
 704         struct g_provider *pp;
 705         intmax_t *val, delaymsec, error, rdelayprob, rfailprob, wdelayprob,
 706             wfailprob, count_until_fail;
 707         const char *name;
 708         char param[16];
 709         int i, *nargs;
 710
 711         g_topology_assert();
 712
 713         count_until_fail = -1;
 714         delaymsec = -1;
 715         error = -1;
 716         rdelayprob = -1;
 717         rfailprob = -1;
 718         wdelayprob = -1;
 719         wfailprob = -1;
 720
 721         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 722         if (nargs == NULL) {
 723                 gctl_error(req, "No '%s' argument", "nargs");
 724                 return;
 725         }
 726         if (*nargs <= 0) {
 727                 gctl_error(req, "Missing device(s).");
 728                 return;
 729         }
 730         val = gctl_get_paraml_opt(req, "error", sizeof(*val));
 731         if (val != NULL) {
 732                 error = *val;
 733         }
 734         val = gctl_get_paraml_opt(req, "count_until_fail", sizeof(*val));
 735         if (val != NULL) {
 736                 count_until_fail = *val;
 737         }
 738         val = gctl_get_paraml_opt(req, "rfailprob", sizeof(*val));
 739         if (val != NULL) {
 740                 rfailprob = *val;
 741                 if (rfailprob < -1 || rfailprob > 100) {
 742                         gctl_error(req, "Invalid '%s' argument", "rfailprob");
 743                         return;
 744                 }
 745         }
 746         val = gctl_get_paraml_opt(req, "wfailprob", sizeof(*val));
 747         if (val != NULL) {
 748                 wfailprob = *val;
 749                 if (wfailprob < -1 || wfailprob > 100) {
 750                         gctl_error(req, "Invalid '%s' argument", "wfailprob");
 751                         return;
 752                 }
 753         }
 754         val = gctl_get_paraml_opt(req, "delaymsec", sizeof(*val));
 755         if (val != NULL) {
 756                 delaymsec = *val;
 757                 if (delaymsec < 1 && delaymsec != -1) {
 758                         gctl_error(req, "Invalid '%s' argument", "delaymsec");
 759                         return;
 760                 }
 761         }
 762         val = gctl_get_paraml_opt(req, "rdelayprob", sizeof(*val));
 763         if (val != NULL) {
 764                 rdelayprob = *val;
 765                 if (rdelayprob < -1 || rdelayprob > 100) {
 766                         gctl_error(req, "Invalid '%s' argument", "rdelayprob");
 767                         return;
 768                 }
 769         }
 770         val = gctl_get_paraml_opt(req, "wdelayprob", sizeof(*val));
 771         if (val != NULL) {
 772                 wdelayprob = *val;
 773                 if (wdelayprob < -1 || wdelayprob > 100) {
 774                         gctl_error(req, "Invalid '%s' argument", "wdelayprob");
 775                         return;
 776                 }
 777         }
 778
 779         for (i = 0; i < *nargs; i++) {
 780                 snprintf(param, sizeof(param), "arg%d", i);
 781                 name = gctl_get_asciiparam(req, param);
 782                 if (name == NULL) {
 783                         gctl_error(req, "No 'arg%d' argument", i);
 784                         return;
 785                 }
 786                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 787                         name += strlen("/dev/");
 788                 pp = g_provider_by_name(name);
 789                 if (pp == NULL || pp->geom->class != mp) {
 790                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 791                         gctl_error(req, "Provider %s is invalid.", name);
 792                         return;
 793                 }
 794                 sc = pp->geom->softc;
 795                 if (error != -1)
 796                         sc->sc_error = (int)error;
 797                 if (rfailprob != -1)
 798                         sc->sc_rfailprob = (u_int)rfailprob;
 799                 if (wfailprob != -1)
 800                         sc->sc_wfailprob = (u_int)wfailprob;
 801                 if (rdelayprob != -1)
 802                         sc->sc_rdelayprob = (u_int)rdelayprob;
 803                 if (wdelayprob != -1)
 804                         sc->sc_wdelayprob = (u_int)wdelayprob;
 805                 if (delaymsec != -1)
 806                         sc->sc_delaymsec = (u_int)delaymsec;
 807                 if (count_until_fail != -1)
 808                         sc->sc_count_until_fail = (u_int)count_until_fail;
 809         }
 810 }
 811
 812 static struct g_geom *
 813 g_nop_find_geom(struct g_class *mp, const char *name)
 814 {
 815         struct g_geom *gp;
 816
 817         LIST_FOREACH(gp, &mp->geom, geom) {
 818                 if (strcmp(gp->name, name) == 0)
 819                         return (gp);
 820         }
 821         return (NULL);
 822 }
 823
 824 static void
 825 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
 826 {
 827         int *nargs, *force, error, i;
 828         struct g_geom *gp;
 829         const char *name;
 830         char param[16];
 831
 832         g_topology_assert();
 833
 834         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 835         if (nargs == NULL) {
 836                 gctl_error(req, "No '%s' argument", "nargs");
 837                 return;
 838         }
 839         if (*nargs <= 0) {
 840                 gctl_error(req, "Missing device(s).");
 841                 return;
 842         }
 843         force = gctl_get_paraml(req, "force", sizeof(*force));
 844         if (force == NULL) {
 845                 gctl_error(req, "No 'force' argument");
 846                 return;
 847         }
 848
 849         for (i = 0; i < *nargs; i++) {
 850                 snprintf(param, sizeof(param), "arg%d", i);
 851                 name = gctl_get_asciiparam(req, param);
 852                 if (name == NULL) {
 853                         gctl_error(req, "No 'arg%d' argument", i);
 854                         return;
 855                 }
 856                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 857                         name += strlen("/dev/");
 858                 gp = g_nop_find_geom(mp, name);
 859                 if (gp == NULL) {
 860                         G_NOP_DEBUG(1, "Device %s is invalid.", name);
 861                         gctl_error(req, "Device %s is invalid.", name);
 862                         return;
 863                 }
 864                 error = g_nop_destroy(gp, *force);
 865                 if (error != 0) {
 866                         gctl_error(req, "Cannot destroy device %s (error=%d).",
 867                             gp->name, error);
 868                         return;
 869                 }
 870         }
 871 }
 872
 873 static void
 874 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp)
 875 {
 876         struct g_nop_softc *sc;
 877         struct g_provider *pp;
 878         const char *name;
 879         char param[16];
 880         int i, *nargs;
 881
 882         g_topology_assert();
 883
 884         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 885         if (nargs == NULL) {
 886                 gctl_error(req, "No '%s' argument", "nargs");
 887                 return;
 888         }
 889         if (*nargs <= 0) {
 890                 gctl_error(req, "Missing device(s).");
 891                 return;
 892         }
 893
 894         for (i = 0; i < *nargs; i++) {
 895                 snprintf(param, sizeof(param), "arg%d", i);
 896                 name = gctl_get_asciiparam(req, param);
 897                 if (name == NULL) {
 898                         gctl_error(req, "No 'arg%d' argument", i);
 899                         return;
 900                 }
 901                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 902                         name += strlen("/dev/");
 903                 pp = g_provider_by_name(name);
 904                 if (pp == NULL || pp->geom->class != mp) {
 905                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 906                         gctl_error(req, "Provider %s is invalid.", name);
 907                         return;
 908                 }
 909                 sc = pp->geom->softc;
 910                 sc->sc_reads = 0;
 911                 sc->sc_writes = 0;
 912                 sc->sc_deletes = 0;
 913                 sc->sc_getattrs = 0;
 914                 sc->sc_flushes = 0;
 915                 sc->sc_speedups = 0;
 916                 sc->sc_cmd0s = 0;
 917                 sc->sc_cmd1s = 0;
 918                 sc->sc_cmd2s = 0;
 919                 sc->sc_readbytes = 0;
 920                 sc->sc_wrotebytes = 0;
 921         }
 922 }
 923
 924 static void
 925 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 926 {
 927         uint32_t *version;
 928
 929         g_topology_assert();
 930
 931         version = gctl_get_paraml(req, "version", sizeof(*version));
 932         if (version == NULL) {
 933                 gctl_error(req, "No '%s' argument.", "version");
 934                 return;
 935         }
 936         if (*version != G_NOP_VERSION) {
 937                 gctl_error(req, "Userland and kernel parts are out of sync.");
 938                 return;
 939         }
 940
 941         if (strcmp(verb, "create") == 0) {
 942                 g_nop_ctl_create(req, mp);
 943                 return;
 944         } else if (strcmp(verb, "configure") == 0) {
 945                 g_nop_ctl_configure(req, mp);
 946                 return;
 947         } else if (strcmp(verb, "destroy") == 0) {
 948                 g_nop_ctl_destroy(req, mp);
 949                 return;
 950         } else if (strcmp(verb, "reset") == 0) {
 951                 g_nop_ctl_reset(req, mp);
 952                 return;
 953         }
 954
 955         gctl_error(req, "Unknown verb.");
 956 }
 957
 958 static void
 959 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 960     struct g_consumer *cp, struct g_provider *pp)
 961 {
 962         struct g_nop_softc *sc;
 963
 964         if (pp != NULL || cp != NULL)
 965                 return;
 966         sc = gp->softc;
 967         sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
 968             (intmax_t)sc->sc_offset);
 969         sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent,
 970             sc->sc_rfailprob);
 971         sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent,
 972             sc->sc_wfailprob);
 973         sbuf_printf(sb, "%s<ReadDelayedProb>%u</ReadDelayedProb>\n", indent,
 974             sc->sc_rdelayprob);
 975         sbuf_printf(sb, "%s<WriteDelayedProb>%u</WriteDelayedProb>\n", indent,
 976             sc->sc_wdelayprob);
 977         sbuf_printf(sb, "%s<Delay>%d</Delay>\n", indent, sc->sc_delaymsec);
 978         sbuf_printf(sb, "%s<CountUntilFail>%u</CountUntilFail>\n", indent,
 979             sc->sc_count_until_fail);
 980         sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
 981         sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
 982         sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
 983         sbuf_printf(sb, "%s<Deletes>%ju</Deletes>\n", indent, sc->sc_deletes);
 984         sbuf_printf(sb, "%s<Getattrs>%ju</Getattrs>\n", indent, sc->sc_getattrs);
 985         sbuf_printf(sb, "%s<Flushes>%ju</Flushes>\n", indent, sc->sc_flushes);
 986         sbuf_printf(sb, "%s<Speedups>%ju</Speedups>\n", indent, sc->sc_speedups);
 987         sbuf_printf(sb, "%s<Cmd0s>%ju</Cmd0s>\n", indent, sc->sc_cmd0s);
 988         sbuf_printf(sb, "%s<Cmd1s>%ju</Cmd1s>\n", indent, sc->sc_cmd1s);
 989         sbuf_printf(sb, "%s<Cmd2s>%ju</Cmd2s>\n", indent, sc->sc_cmd2s);
 990         sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
 991             sc->sc_readbytes);
 992         sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
 993             sc->sc_wrotebytes);
 994 }
 995
 996 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
 997 MODULE_VERSION(geom_nop, 0);