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 | CTLFLAG_MPSAFE, 0,
  51     "GEOM_NOP stuff");
  52 static u_int g_nop_debug = 0;
  53 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
  54     "Debug level");
  55
  56 static int g_nop_destroy(struct g_geom *gp, boolean_t force);
  57 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
  58     struct g_geom *gp);
  59 static void g_nop_config(struct gctl_req *req, struct g_class *mp,
  60     const char *verb);
  61 static g_access_t g_nop_access;
  62 static g_dumpconf_t g_nop_dumpconf;
  63 static g_orphan_t g_nop_orphan;
  64 static g_provgone_t g_nop_providergone;
  65 static g_resize_t g_nop_resize;
  66 static g_start_t g_nop_start;
  67
  68 struct g_class g_nop_class = {
  69         .name = G_NOP_CLASS_NAME,
  70         .version = G_VERSION,
  71         .ctlreq = g_nop_config,
  72         .destroy_geom = g_nop_destroy_geom,
  73         .access = g_nop_access,
  74         .dumpconf = g_nop_dumpconf,
  75         .orphan = g_nop_orphan,
  76         .providergone = g_nop_providergone,
  77         .resize = g_nop_resize,
  78         .start = g_nop_start,
  79 };
  80
  81 struct g_nop_delay {
  82         struct callout                   dl_cal;
  83         struct bio                      *dl_bio;
  84         TAILQ_ENTRY(g_nop_delay)         dl_next;
  85 };
  86
  87 static bool
  88 g_nop_verify_nprefix(const char *name)
  89 {
  90         int i;
  91
  92         for (i = 0; i < strlen(name); i++) {
  93                 if (isalpha(name[i]) == 0 && isdigit(name[i]) == 0) {
  94                         return (false);
  95                 }
  96         }
  97
  98         return (true);
  99 }
 100
 101 static void
 102 g_nop_orphan(struct g_consumer *cp)
 103 {
 104
 105         g_topology_assert();
 106         g_nop_destroy(cp->geom, 1);
 107 }
 108
 109 static void
 110 g_nop_resize(struct g_consumer *cp)
 111 {
 112         struct g_nop_softc *sc;
 113         struct g_geom *gp;
 114         struct g_provider *pp;
 115         off_t size;
 116
 117         g_topology_assert();
 118
 119         gp = cp->geom;
 120         sc = gp->softc;
 121
 122         if (sc->sc_explicitsize != 0)
 123                 return;
 124         if (cp->provider->mediasize < sc->sc_offset) {
 125                 g_nop_destroy(gp, 1);
 126                 return;
 127         }
 128         size = cp->provider->mediasize - sc->sc_offset;
 129         LIST_FOREACH(pp, &gp->provider, provider)
 130                 g_resize_provider(pp, size);
 131 }
 132
 133 static int
 134 g_nop_dumper(void *priv, void *virtual, vm_offset_t physical, off_t offset,
 135     size_t length)
 136 {
 137
 138         return (0);
 139 }
 140
 141 static void
 142 g_nop_kerneldump(struct bio *bp, struct g_nop_softc *sc)
 143 {
 144         struct g_kerneldump *gkd;
 145         struct g_geom *gp;
 146         struct g_provider *pp;
 147
 148         gkd = (struct g_kerneldump *)bp->bio_data;
 149         gp = bp->bio_to->geom;
 150         g_trace(G_T_TOPOLOGY, "%s(%s, %jd, %jd)", __func__, gp->name,
 151             (intmax_t)gkd->offset, (intmax_t)gkd->length);
 152
 153         pp = LIST_FIRST(&gp->provider);
 154
 155         gkd->di.dumper = g_nop_dumper;
 156         gkd->di.priv = sc;
 157         gkd->di.blocksize = pp->sectorsize;
 158         gkd->di.maxiosize = DFLTPHYS;
 159         gkd->di.mediaoffset = sc->sc_offset + gkd->offset;
 160         if (gkd->offset > sc->sc_explicitsize) {
 161                 g_io_deliver(bp, ENODEV);
 162                 return;
 163         }
 164         if (gkd->offset + gkd->length > sc->sc_explicitsize)
 165                 gkd->length = sc->sc_explicitsize - gkd->offset;
 166         gkd->di.mediasize = gkd->length;
 167         g_io_deliver(bp, 0);
 168 }
 169
 170 static void
 171 g_nop_pass(struct bio *cbp, struct g_geom *gp)
 172 {
 173
 174         G_NOP_LOGREQ(cbp, "Sending request.");
 175         g_io_request(cbp, LIST_FIRST(&gp->consumer));
 176 }
 177
 178 static void
 179 g_nop_pass_timeout(void *data)
 180 {
 181         struct g_nop_softc *sc;
 182         struct g_geom *gp;
 183         struct g_nop_delay *gndelay;
 184
 185         gndelay = (struct g_nop_delay *)data;
 186
 187         gp = gndelay->dl_bio->bio_to->geom;
 188         sc = gp->softc;
 189
 190         mtx_lock(&sc->sc_lock);
 191         TAILQ_REMOVE(&sc->sc_head_delay, gndelay, dl_next);
 192         mtx_unlock(&sc->sc_lock);
 193
 194         g_nop_pass(gndelay->dl_bio, gp);
 195
 196         g_free(data);
 197 }
 198
 199 static void
 200 g_nop_start(struct bio *bp)
 201 {
 202         struct g_nop_softc *sc;
 203         struct g_geom *gp;
 204         struct g_provider *pp;
 205         struct bio *cbp;
 206         u_int failprob, delayprob, delaytime;
 207
 208         failprob = delayprob = delaytime = 0;
 209
 210         gp = bp->bio_to->geom;
 211         sc = gp->softc;
 212
 213         G_NOP_LOGREQ(bp, "Request received.");
 214         mtx_lock(&sc->sc_lock);
 215         switch (bp->bio_cmd) {
 216         case BIO_READ:
 217                 sc->sc_reads++;
 218                 sc->sc_readbytes += bp->bio_length;
 219                 if (sc->sc_count_until_fail != 0) {
 220                         sc->sc_count_until_fail -= 1;
 221                 } else {
 222                         failprob = sc->sc_rfailprob;
 223                         delayprob = sc->sc_rdelayprob;
 224                         delaytime = sc->sc_delaymsec;
 225                 }
 226                 break;
 227         case BIO_WRITE:
 228                 sc->sc_writes++;
 229                 sc->sc_wrotebytes += bp->bio_length;
 230                 if (sc->sc_count_until_fail != 0) {
 231                         sc->sc_count_until_fail -= 1;
 232                 } else {
 233                         failprob = sc->sc_wfailprob;
 234                         delayprob = sc->sc_wdelayprob;
 235                         delaytime = sc->sc_delaymsec;
 236                 }
 237                 break;
 238         case BIO_DELETE:
 239                 sc->sc_deletes++;
 240                 break;
 241         case BIO_GETATTR:
 242                 sc->sc_getattrs++;
 243                 if (sc->sc_physpath &&
 244                     g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath))
 245                         ;
 246                 else if (strcmp(bp->bio_attribute, "GEOM::kerneldump") == 0)
 247                         g_nop_kerneldump(bp, sc);
 248                 else
 249                         /*
 250                          * Fallthrough to forwarding the GETATTR down to the
 251                          * lower level device.
 252                          */
 253                         break;
 254                 mtx_unlock(&sc->sc_lock);
 255                 return;
 256         case BIO_FLUSH:
 257                 sc->sc_flushes++;
 258                 break;
 259         case BIO_SPEEDUP:
 260                 sc->sc_speedups++;
 261                 break;
 262         case BIO_CMD0:
 263                 sc->sc_cmd0s++;
 264                 break;
 265         case BIO_CMD1:
 266                 sc->sc_cmd1s++;
 267                 break;
 268         case BIO_CMD2:
 269                 sc->sc_cmd2s++;
 270                 break;
 271         }
 272         mtx_unlock(&sc->sc_lock);
 273
 274         if (failprob > 0) {
 275                 u_int rval;
 276
 277                 rval = arc4random() % 100;
 278                 if (rval < failprob) {
 279                         G_NOP_LOGREQLVL(1, bp, "Returning error=%d.", sc->sc_error);
 280                         g_io_deliver(bp, sc->sc_error);
 281                         return;
 282                 }
 283         }
 284
 285         cbp = g_clone_bio(bp);
 286         if (cbp == NULL) {
 287                 g_io_deliver(bp, ENOMEM);
 288                 return;
 289         }
 290         cbp->bio_done = g_std_done;
 291         cbp->bio_offset = bp->bio_offset + sc->sc_offset;
 292         pp = LIST_FIRST(&gp->provider);
 293         KASSERT(pp != NULL, ("NULL pp"));
 294         cbp->bio_to = pp;
 295
 296         if (delayprob > 0) {
 297                 struct g_nop_delay *gndelay;
 298                 u_int rval;
 299
 300                 rval = arc4random() % 100;
 301                 if (rval < delayprob) {
 302                         gndelay = g_malloc(sizeof(*gndelay), M_NOWAIT | M_ZERO);
 303                         if (gndelay != NULL) {
 304                                 callout_init(&gndelay->dl_cal, 1);
 305
 306                                 gndelay->dl_bio = cbp;
 307
 308                                 mtx_lock(&sc->sc_lock);
 309                                 TAILQ_INSERT_TAIL(&sc->sc_head_delay, gndelay,
 310                                     dl_next);
 311                                 mtx_unlock(&sc->sc_lock);
 312
 313                                 callout_reset(&gndelay->dl_cal,
 314                                     MSEC_2_TICKS(delaytime), g_nop_pass_timeout,
 315                                     gndelay);
 316                                 return;
 317                         }
 318                 }
 319         }
 320
 321         g_nop_pass(cbp, gp);
 322 }
 323
 324 static int
 325 g_nop_access(struct g_provider *pp, int dr, int dw, int de)
 326 {
 327         struct g_geom *gp;
 328         struct g_consumer *cp;
 329         int error;
 330
 331         gp = pp->geom;
 332         cp = LIST_FIRST(&gp->consumer);
 333         error = g_access(cp, dr, dw, de);
 334
 335         return (error);
 336 }
 337
 338 static int
 339 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
 340     const char *gnopname, int ioerror, u_int count_until_fail,
 341     u_int rfailprob, u_int wfailprob, u_int delaymsec, u_int rdelayprob,
 342     u_int wdelayprob, off_t offset, off_t size, u_int secsize, off_t stripesize,
 343     off_t stripeoffset, const char *physpath)
 344 {
 345         struct g_nop_softc *sc;
 346         struct g_geom *gp;
 347         struct g_provider *newpp;
 348         struct g_consumer *cp;
 349         struct g_geom_alias *gap;
 350         char name[64];
 351         int error, n;
 352         off_t explicitsize;
 353
 354         g_topology_assert();
 355
 356         gp = NULL;
 357         newpp = NULL;
 358         cp = NULL;
 359
 360         if ((offset % pp->sectorsize) != 0) {
 361                 gctl_error(req, "Invalid offset for provider %s.", pp->name);
 362                 return (EINVAL);
 363         }
 364         if ((size % pp->sectorsize) != 0) {
 365                 gctl_error(req, "Invalid size for provider %s.", pp->name);
 366                 return (EINVAL);
 367         }
 368         if (offset >= pp->mediasize) {
 369                 gctl_error(req, "Invalid offset for provider %s.", pp->name);
 370                 return (EINVAL);
 371         }
 372         explicitsize = size;
 373         if (size == 0)
 374                 size = pp->mediasize - offset;
 375         if (offset + size > pp->mediasize) {
 376                 gctl_error(req, "Invalid size for provider %s.", pp->name);
 377                 return (EINVAL);
 378         }
 379         if (secsize == 0)
 380                 secsize = pp->sectorsize;
 381         else if ((secsize % pp->sectorsize) != 0) {
 382                 gctl_error(req, "Invalid secsize for provider %s.", pp->name);
 383                 return (EINVAL);
 384         }
 385         if (secsize > MAXPHYS) {
 386                 gctl_error(req, "secsize is too big.");
 387                 return (EINVAL);
 388         }
 389         size -= size % secsize;
 390         if ((stripesize % pp->sectorsize) != 0) {
 391                 gctl_error(req, "Invalid stripesize for provider %s.", pp->name);
 392                 return (EINVAL);
 393         }
 394         if ((stripeoffset % pp->sectorsize) != 0) {
 395                 gctl_error(req, "Invalid stripeoffset for provider %s.", pp->name);
 396                 return (EINVAL);
 397         }
 398         if (stripesize != 0 && stripeoffset >= stripesize) {
 399                 gctl_error(req, "stripeoffset is too big.");
 400                 return (EINVAL);
 401         }
 402         if (gnopname != NULL && !g_nop_verify_nprefix(gnopname)) {
 403                 gctl_error(req, "Name %s is invalid.", gnopname);
 404                 return (EINVAL);
 405         }
 406
 407         if (gnopname != NULL) {
 408                 n = snprintf(name, sizeof(name), "%s%s", gnopname,
 409                     G_NOP_SUFFIX);
 410         } else {
 411                 n = snprintf(name, sizeof(name), "%s%s", pp->name,
 412                     G_NOP_SUFFIX);
 413         }
 414         if (n <= 0 || n >= sizeof(name)) {
 415                 gctl_error(req, "Invalid provider name.");
 416                 return (EINVAL);
 417         }
 418         LIST_FOREACH(gp, &mp->geom, geom) {
 419                 if (strcmp(gp->name, name) == 0) {
 420                         gctl_error(req, "Provider %s already exists.", name);
 421                         return (EEXIST);
 422                 }
 423         }
 424         gp = g_new_geomf(mp, "%s", name);
 425         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 426         sc->sc_offset = offset;
 427         sc->sc_explicitsize = explicitsize;
 428         sc->sc_stripesize = stripesize;
 429         sc->sc_stripeoffset = stripeoffset;
 430         if (physpath && strcmp(physpath, G_NOP_PHYSPATH_PASSTHROUGH)) {
 431                 sc->sc_physpath = strndup(physpath, MAXPATHLEN, M_GEOM);
 432         } else
 433                 sc->sc_physpath = NULL;
 434         sc->sc_error = ioerror;
 435         sc->sc_count_until_fail = count_until_fail;
 436         sc->sc_rfailprob = rfailprob;
 437         sc->sc_wfailprob = wfailprob;
 438         sc->sc_delaymsec = delaymsec;
 439         sc->sc_rdelayprob = rdelayprob;
 440         sc->sc_wdelayprob = wdelayprob;
 441         sc->sc_reads = 0;
 442         sc->sc_writes = 0;
 443         sc->sc_deletes = 0;
 444         sc->sc_getattrs = 0;
 445         sc->sc_flushes = 0;
 446         sc->sc_speedups = 0;
 447         sc->sc_cmd0s = 0;
 448         sc->sc_cmd1s = 0;
 449         sc->sc_cmd2s = 0;
 450         sc->sc_readbytes = 0;
 451         sc->sc_wrotebytes = 0;
 452         TAILQ_INIT(&sc->sc_head_delay);
 453         mtx_init(&sc->sc_lock, "gnop lock", NULL, MTX_DEF);
 454         gp->softc = sc;
 455
 456         newpp = g_new_providerf(gp, "%s", gp->name);
 457         newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
 458         newpp->mediasize = size;
 459         newpp->sectorsize = secsize;
 460         newpp->stripesize = stripesize;
 461         newpp->stripeoffset = stripeoffset;
 462         LIST_FOREACH(gap, &pp->aliases, ga_next)
 463                 g_provider_add_alias(newpp, "%s%s", gap->ga_alias, G_NOP_SUFFIX);
 464
 465         cp = g_new_consumer(gp);
 466         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 467         error = g_attach(cp, pp);
 468         if (error != 0) {
 469                 gctl_error(req, "Cannot attach to provider %s.", pp->name);
 470                 goto fail;
 471         }
 472
 473         newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED;
 474         g_error_provider(newpp, 0);
 475         G_NOP_DEBUG(0, "Device %s created.", gp->name);
 476         return (0);
 477 fail:
 478         if (cp->provider != NULL)
 479                 g_detach(cp);
 480         g_destroy_consumer(cp);
 481         g_destroy_provider(newpp);
 482         mtx_destroy(&sc->sc_lock);
 483         free(sc->sc_physpath, M_GEOM);
 484         g_free(gp->softc);
 485         g_destroy_geom(gp);
 486         return (error);
 487 }
 488
 489 static void
 490 g_nop_providergone(struct g_provider *pp)
 491 {
 492         struct g_geom *gp = pp->geom;
 493         struct g_nop_softc *sc = gp->softc;
 494
 495         KASSERT(TAILQ_EMPTY(&sc->sc_head_delay),
 496             ("delayed request list is not empty"));
 497
 498         gp->softc = NULL;
 499         free(sc->sc_physpath, M_GEOM);
 500         mtx_destroy(&sc->sc_lock);
 501         g_free(sc);
 502 }
 503
 504 static int
 505 g_nop_destroy(struct g_geom *gp, boolean_t force)
 506 {
 507         struct g_nop_softc *sc;
 508         struct g_provider *pp;
 509
 510         g_topology_assert();
 511         sc = gp->softc;
 512         if (sc == NULL)
 513                 return (ENXIO);
 514         pp = LIST_FIRST(&gp->provider);
 515         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 516                 if (force) {
 517                         G_NOP_DEBUG(0, "Device %s is still open, so it "
 518                             "can't be definitely removed.", pp->name);
 519                 } else {
 520                         G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
 521                             pp->name, pp->acr, pp->acw, pp->ace);
 522                         return (EBUSY);
 523                 }
 524         } else {
 525                 G_NOP_DEBUG(0, "Device %s removed.", gp->name);
 526         }
 527
 528         g_wither_geom(gp, ENXIO);
 529
 530         return (0);
 531 }
 532
 533 static int
 534 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
 535 {
 536
 537         return (g_nop_destroy(gp, 0));
 538 }
 539
 540 static void
 541 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
 542 {
 543         struct g_provider *pp;
 544         intmax_t *val, error, rfailprob, wfailprob, count_until_fail, offset,
 545             secsize, size, stripesize, stripeoffset, delaymsec,
 546             rdelayprob, wdelayprob;
 547         const char *name, *physpath, *gnopname;
 548         char param[16];
 549         int i, *nargs;
 550
 551         g_topology_assert();
 552
 553         error = -1;
 554         rfailprob = -1;
 555         wfailprob = -1;
 556         count_until_fail = -1;
 557         offset = 0;
 558         secsize = 0;
 559         size = 0;
 560         stripesize = 0;
 561         stripeoffset = 0;
 562         delaymsec = -1;
 563         rdelayprob = -1;
 564         wdelayprob = -1;
 565
 566         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 567         if (nargs == NULL) {
 568                 gctl_error(req, "No '%s' argument", "nargs");
 569                 return;
 570         }
 571         if (*nargs <= 0) {
 572                 gctl_error(req, "Missing device(s).");
 573                 return;
 574         }
 575         val = gctl_get_paraml_opt(req, "error", sizeof(*val));
 576         if (val != NULL) {
 577                 error = *val;
 578         }
 579         val = gctl_get_paraml_opt(req, "rfailprob", sizeof(*val));
 580         if (val != NULL) {
 581                 rfailprob = *val;
 582                 if (rfailprob < -1 || rfailprob > 100) {
 583                         gctl_error(req, "Invalid '%s' argument", "rfailprob");
 584                         return;
 585                 }
 586         }
 587         val = gctl_get_paraml_opt(req, "wfailprob", sizeof(*val));
 588         if (val != NULL) {
 589                 wfailprob = *val;
 590                 if (wfailprob < -1 || wfailprob > 100) {
 591                         gctl_error(req, "Invalid '%s' argument", "wfailprob");
 592                         return;
 593                 }
 594         }
 595         val = gctl_get_paraml_opt(req, "delaymsec", sizeof(*val));
 596         if (val != NULL) {
 597                 delaymsec = *val;
 598                 if (delaymsec < 1 && delaymsec != -1) {
 599                         gctl_error(req, "Invalid '%s' argument", "delaymsec");
 600                         return;
 601                 }
 602         }
 603         val = gctl_get_paraml_opt(req, "rdelayprob", sizeof(*val));
 604         if (val != NULL) {
 605                 rdelayprob = *val;
 606                 if (rdelayprob < -1 || rdelayprob > 100) {
 607                         gctl_error(req, "Invalid '%s' argument", "rdelayprob");
 608                         return;
 609                 }
 610         }
 611         val = gctl_get_paraml_opt(req, "wdelayprob", sizeof(*val));
 612         if (val != NULL) {
 613                 wdelayprob = *val;
 614                 if (wdelayprob < -1 || wdelayprob > 100) {
 615                         gctl_error(req, "Invalid '%s' argument", "wdelayprob");
 616                         return;
 617                 }
 618         }
 619         val = gctl_get_paraml_opt(req, "count_until_fail", sizeof(*val));
 620         if (val != NULL) {
 621                 count_until_fail = *val;
 622                 if (count_until_fail < -1) {
 623                         gctl_error(req, "Invalid '%s' argument",
 624                             "count_until_fail");
 625                         return;
 626                 }
 627         }
 628         val = gctl_get_paraml_opt(req, "offset", sizeof(*val));
 629         if (val != NULL) {
 630                 offset = *val;
 631                 if (offset < 0) {
 632                         gctl_error(req, "Invalid '%s' argument", "offset");
 633                         return;
 634                 }
 635         }
 636         val = gctl_get_paraml_opt(req, "size", sizeof(*val));
 637         if (val != NULL) {
 638                 size = *val;
 639                 if (size < 0) {
 640                         gctl_error(req, "Invalid '%s' argument", "size");
 641                         return;
 642                 }
 643         }
 644         val = gctl_get_paraml_opt(req, "secsize", sizeof(*val));
 645         if (val != NULL) {
 646                 secsize = *val;
 647                 if (secsize < 0) {
 648                         gctl_error(req, "Invalid '%s' argument", "secsize");
 649                         return;
 650                 }
 651         }
 652         val = gctl_get_paraml_opt(req, "stripesize", sizeof(*val));
 653         if (val != NULL) {
 654                 stripesize = *val;
 655                 if (stripesize < 0) {
 656                         gctl_error(req, "Invalid '%s' argument", "stripesize");
 657                         return;
 658                 }
 659         }
 660         val = gctl_get_paraml_opt(req, "stripeoffset", sizeof(*val));
 661         if (val != NULL) {
 662                 stripeoffset = *val;
 663                 if (stripeoffset < 0) {
 664                         gctl_error(req, "Invalid '%s' argument",
 665                             "stripeoffset");
 666                         return;
 667                 }
 668         }
 669         physpath = gctl_get_asciiparam(req, "physpath");
 670         gnopname = gctl_get_asciiparam(req, "gnopname");
 671
 672         for (i = 0; i < *nargs; i++) {
 673                 snprintf(param, sizeof(param), "arg%d", i);
 674                 name = gctl_get_asciiparam(req, param);
 675                 if (name == NULL) {
 676                         gctl_error(req, "No 'arg%d' argument", i);
 677                         return;
 678                 }
 679                 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
 680                         name += strlen(_PATH_DEV);
 681                 pp = g_provider_by_name(name);
 682                 if (pp == NULL) {
 683                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 684                         gctl_error(req, "Provider %s is invalid.", name);
 685                         return;
 686                 }
 687                 if (g_nop_create(req, mp, pp,
 688                     gnopname,
 689                     error == -1 ? EIO : (int)error,
 690                     count_until_fail == -1 ? 0 : (u_int)count_until_fail,
 691                     rfailprob == -1 ? 0 : (u_int)rfailprob,
 692                     wfailprob == -1 ? 0 : (u_int)wfailprob,
 693                     delaymsec == -1 ? 1 : (u_int)delaymsec,
 694                     rdelayprob == -1 ? 0 : (u_int)rdelayprob,
 695                     wdelayprob == -1 ? 0 : (u_int)wdelayprob,
 696                     (off_t)offset, (off_t)size, (u_int)secsize,
 697                     (off_t)stripesize, (off_t)stripeoffset,
 698                     physpath) != 0) {
 699                         return;
 700                 }
 701         }
 702 }
 703
 704 static void
 705 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
 706 {
 707         struct g_nop_softc *sc;
 708         struct g_provider *pp;
 709         intmax_t *val, delaymsec, error, rdelayprob, rfailprob, wdelayprob,
 710             wfailprob, count_until_fail;
 711         const char *name;
 712         char param[16];
 713         int i, *nargs;
 714
 715         g_topology_assert();
 716
 717         count_until_fail = -1;
 718         delaymsec = -1;
 719         error = -1;
 720         rdelayprob = -1;
 721         rfailprob = -1;
 722         wdelayprob = -1;
 723         wfailprob = -1;
 724
 725         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 726         if (nargs == NULL) {
 727                 gctl_error(req, "No '%s' argument", "nargs");
 728                 return;
 729         }
 730         if (*nargs <= 0) {
 731                 gctl_error(req, "Missing device(s).");
 732                 return;
 733         }
 734         val = gctl_get_paraml_opt(req, "error", sizeof(*val));
 735         if (val != NULL) {
 736                 error = *val;
 737         }
 738         val = gctl_get_paraml_opt(req, "count_until_fail", sizeof(*val));
 739         if (val != NULL) {
 740                 count_until_fail = *val;
 741         }
 742         val = gctl_get_paraml_opt(req, "rfailprob", sizeof(*val));
 743         if (val != NULL) {
 744                 rfailprob = *val;
 745                 if (rfailprob < -1 || rfailprob > 100) {
 746                         gctl_error(req, "Invalid '%s' argument", "rfailprob");
 747                         return;
 748                 }
 749         }
 750         val = gctl_get_paraml_opt(req, "wfailprob", sizeof(*val));
 751         if (val != NULL) {
 752                 wfailprob = *val;
 753                 if (wfailprob < -1 || wfailprob > 100) {
 754                         gctl_error(req, "Invalid '%s' argument", "wfailprob");
 755                         return;
 756                 }
 757         }
 758         val = gctl_get_paraml_opt(req, "delaymsec", sizeof(*val));
 759         if (val != NULL) {
 760                 delaymsec = *val;
 761                 if (delaymsec < 1 && delaymsec != -1) {
 762                         gctl_error(req, "Invalid '%s' argument", "delaymsec");
 763                         return;
 764                 }
 765         }
 766         val = gctl_get_paraml_opt(req, "rdelayprob", sizeof(*val));
 767         if (val != NULL) {
 768                 rdelayprob = *val;
 769                 if (rdelayprob < -1 || rdelayprob > 100) {
 770                         gctl_error(req, "Invalid '%s' argument", "rdelayprob");
 771                         return;
 772                 }
 773         }
 774         val = gctl_get_paraml_opt(req, "wdelayprob", sizeof(*val));
 775         if (val != NULL) {
 776                 wdelayprob = *val;
 777                 if (wdelayprob < -1 || wdelayprob > 100) {
 778                         gctl_error(req, "Invalid '%s' argument", "wdelayprob");
 779                         return;
 780                 }
 781         }
 782
 783         for (i = 0; i < *nargs; i++) {
 784                 snprintf(param, sizeof(param), "arg%d", i);
 785                 name = gctl_get_asciiparam(req, param);
 786                 if (name == NULL) {
 787                         gctl_error(req, "No 'arg%d' argument", i);
 788                         return;
 789                 }
 790                 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
 791                         name += strlen(_PATH_DEV);
 792                 pp = g_provider_by_name(name);
 793                 if (pp == NULL || pp->geom->class != mp) {
 794                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 795                         gctl_error(req, "Provider %s is invalid.", name);
 796                         return;
 797                 }
 798                 sc = pp->geom->softc;
 799                 if (error != -1)
 800                         sc->sc_error = (int)error;
 801                 if (rfailprob != -1)
 802                         sc->sc_rfailprob = (u_int)rfailprob;
 803                 if (wfailprob != -1)
 804                         sc->sc_wfailprob = (u_int)wfailprob;
 805                 if (rdelayprob != -1)
 806                         sc->sc_rdelayprob = (u_int)rdelayprob;
 807                 if (wdelayprob != -1)
 808                         sc->sc_wdelayprob = (u_int)wdelayprob;
 809                 if (delaymsec != -1)
 810                         sc->sc_delaymsec = (u_int)delaymsec;
 811                 if (count_until_fail != -1)
 812                         sc->sc_count_until_fail = (u_int)count_until_fail;
 813         }
 814 }
 815
 816 static struct g_geom *
 817 g_nop_find_geom(struct g_class *mp, const char *name)
 818 {
 819         struct g_geom *gp;
 820
 821         LIST_FOREACH(gp, &mp->geom, geom) {
 822                 if (strcmp(gp->name, name) == 0)
 823                         return (gp);
 824         }
 825         return (NULL);
 826 }
 827
 828 static void
 829 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
 830 {
 831         int *nargs, *force, error, i;
 832         struct g_geom *gp;
 833         const char *name;
 834         char param[16];
 835
 836         g_topology_assert();
 837
 838         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 839         if (nargs == NULL) {
 840                 gctl_error(req, "No '%s' argument", "nargs");
 841                 return;
 842         }
 843         if (*nargs <= 0) {
 844                 gctl_error(req, "Missing device(s).");
 845                 return;
 846         }
 847         force = gctl_get_paraml(req, "force", sizeof(*force));
 848         if (force == NULL) {
 849                 gctl_error(req, "No 'force' argument");
 850                 return;
 851         }
 852
 853         for (i = 0; i < *nargs; i++) {
 854                 snprintf(param, sizeof(param), "arg%d", i);
 855                 name = gctl_get_asciiparam(req, param);
 856                 if (name == NULL) {
 857                         gctl_error(req, "No 'arg%d' argument", i);
 858                         return;
 859                 }
 860                 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
 861                         name += strlen(_PATH_DEV);
 862                 gp = g_nop_find_geom(mp, name);
 863                 if (gp == NULL) {
 864                         G_NOP_DEBUG(1, "Device %s is invalid.", name);
 865                         gctl_error(req, "Device %s is invalid.", name);
 866                         return;
 867                 }
 868                 error = g_nop_destroy(gp, *force);
 869                 if (error != 0) {
 870                         gctl_error(req, "Cannot destroy device %s (error=%d).",
 871                             gp->name, error);
 872                         return;
 873                 }
 874         }
 875 }
 876
 877 static void
 878 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp)
 879 {
 880         struct g_nop_softc *sc;
 881         struct g_provider *pp;
 882         const char *name;
 883         char param[16];
 884         int i, *nargs;
 885
 886         g_topology_assert();
 887
 888         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 889         if (nargs == NULL) {
 890                 gctl_error(req, "No '%s' argument", "nargs");
 891                 return;
 892         }
 893         if (*nargs <= 0) {
 894                 gctl_error(req, "Missing device(s).");
 895                 return;
 896         }
 897
 898         for (i = 0; i < *nargs; i++) {
 899                 snprintf(param, sizeof(param), "arg%d", i);
 900                 name = gctl_get_asciiparam(req, param);
 901                 if (name == NULL) {
 902                         gctl_error(req, "No 'arg%d' argument", i);
 903                         return;
 904                 }
 905                 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
 906                         name += strlen(_PATH_DEV);
 907                 pp = g_provider_by_name(name);
 908                 if (pp == NULL || pp->geom->class != mp) {
 909                         G_NOP_DEBUG(1, "Provider %s is invalid.", name);
 910                         gctl_error(req, "Provider %s is invalid.", name);
 911                         return;
 912                 }
 913                 sc = pp->geom->softc;
 914                 sc->sc_reads = 0;
 915                 sc->sc_writes = 0;
 916                 sc->sc_deletes = 0;
 917                 sc->sc_getattrs = 0;
 918                 sc->sc_flushes = 0;
 919                 sc->sc_speedups = 0;
 920                 sc->sc_cmd0s = 0;
 921                 sc->sc_cmd1s = 0;
 922                 sc->sc_cmd2s = 0;
 923                 sc->sc_readbytes = 0;
 924                 sc->sc_wrotebytes = 0;
 925         }
 926 }
 927
 928 static void
 929 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 930 {
 931         uint32_t *version;
 932
 933         g_topology_assert();
 934
 935         version = gctl_get_paraml(req, "version", sizeof(*version));
 936         if (version == NULL) {
 937                 gctl_error(req, "No '%s' argument.", "version");
 938                 return;
 939         }
 940         if (*version != G_NOP_VERSION) {
 941                 gctl_error(req, "Userland and kernel parts are out of sync.");
 942                 return;
 943         }
 944
 945         if (strcmp(verb, "create") == 0) {
 946                 g_nop_ctl_create(req, mp);
 947                 return;
 948         } else if (strcmp(verb, "configure") == 0) {
 949                 g_nop_ctl_configure(req, mp);
 950                 return;
 951         } else if (strcmp(verb, "destroy") == 0) {
 952                 g_nop_ctl_destroy(req, mp);
 953                 return;
 954         } else if (strcmp(verb, "reset") == 0) {
 955                 g_nop_ctl_reset(req, mp);
 956                 return;
 957         }
 958
 959         gctl_error(req, "Unknown verb.");
 960 }
 961
 962 static void
 963 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 964     struct g_consumer *cp, struct g_provider *pp)
 965 {
 966         struct g_nop_softc *sc;
 967
 968         if (pp != NULL || cp != NULL)
 969                 return;
 970         sc = gp->softc;
 971         sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
 972             (intmax_t)sc->sc_offset);
 973         sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent,
 974             sc->sc_rfailprob);
 975         sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent,
 976             sc->sc_wfailprob);
 977         sbuf_printf(sb, "%s<ReadDelayedProb>%u</ReadDelayedProb>\n", indent,
 978             sc->sc_rdelayprob);
 979         sbuf_printf(sb, "%s<WriteDelayedProb>%u</WriteDelayedProb>\n", indent,
 980             sc->sc_wdelayprob);
 981         sbuf_printf(sb, "%s<Delay>%d</Delay>\n", indent, sc->sc_delaymsec);
 982         sbuf_printf(sb, "%s<CountUntilFail>%u</CountUntilFail>\n", indent,
 983             sc->sc_count_until_fail);
 984         sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
 985         sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
 986         sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
 987         sbuf_printf(sb, "%s<Deletes>%ju</Deletes>\n", indent, sc->sc_deletes);
 988         sbuf_printf(sb, "%s<Getattrs>%ju</Getattrs>\n", indent, sc->sc_getattrs);
 989         sbuf_printf(sb, "%s<Flushes>%ju</Flushes>\n", indent, sc->sc_flushes);
 990         sbuf_printf(sb, "%s<Speedups>%ju</Speedups>\n", indent, sc->sc_speedups);
 991         sbuf_printf(sb, "%s<Cmd0s>%ju</Cmd0s>\n", indent, sc->sc_cmd0s);
 992         sbuf_printf(sb, "%s<Cmd1s>%ju</Cmd1s>\n", indent, sc->sc_cmd1s);
 993         sbuf_printf(sb, "%s<Cmd2s>%ju</Cmd2s>\n", indent, sc->sc_cmd2s);
 994         sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
 995             sc->sc_readbytes);
 996         sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
 997             sc->sc_wrotebytes);
 998 }
 999
1000 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
1001 MODULE_VERSION(geom_nop, 0);