Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/nop/g_nop.c
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1 /*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/10.2/sys/geom/nop/g_nop.c 260385 2014-01-07 01:32:23Z scottl $"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/lock.h> 35 #include <sys/mutex.h> 36 #include <sys/bio.h> 37 #include <sys/sbuf.h> 38 #include <sys/sysctl.h> 39 #include <sys/malloc.h> 40 #include <geom/geom.h> 41 #include <geom/nop/g_nop.h> 42 43 44 SYSCTL_DECL(_kern_geom); 45 static SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff"); 46 static u_int g_nop_debug = 0; 47 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0, 48 "Debug level"); 49 50 static int g_nop_destroy(struct g_geom *gp, boolean_t force); 51 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, 52 struct g_geom *gp); 53 static void g_nop_config(struct gctl_req *req, struct g_class *mp, 54 const char *verb); 55 static void g_nop_dumpconf(struct sbuf *sb, const char *indent, 56 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 57 58 struct g_class g_nop_class = { 59 .name = G_NOP_CLASS_NAME, 60 .version = G_VERSION, 61 .ctlreq = g_nop_config, 62 .destroy_geom = g_nop_destroy_geom 63 }; 64 65 66 static void 67 g_nop_orphan(struct g_consumer *cp) 68 { 69 70 g_topology_assert(); 71 g_nop_destroy(cp->geom, 1); 72 } 73 74 static void 75 g_nop_resize(struct g_consumer *cp) 76 { 77 struct g_nop_softc *sc; 78 struct g_geom *gp; 79 struct g_provider *pp; 80 off_t size; 81 82 g_topology_assert(); 83 84 gp = cp->geom; 85 sc = gp->softc; 86 87 if (sc->sc_explicitsize != 0) 88 return; 89 if (cp->provider->mediasize < sc->sc_offset) { 90 g_nop_destroy(gp, 1); 91 return; 92 } 93 size = cp->provider->mediasize - sc->sc_offset; 94 LIST_FOREACH(pp, &gp->provider, provider) 95 g_resize_provider(pp, size); 96 } 97 98 static void 99 g_nop_start(struct bio *bp) 100 { 101 struct g_nop_softc *sc; 102 struct g_geom *gp; 103 struct g_provider *pp; 104 struct bio *cbp; 105 u_int failprob = 0; 106 107 gp = bp->bio_to->geom; 108 sc = gp->softc; 109 G_NOP_LOGREQ(bp, "Request received."); 110 mtx_lock(&sc->sc_lock); 111 switch (bp->bio_cmd) { 112 case BIO_READ: 113 sc->sc_reads++; 114 sc->sc_readbytes += bp->bio_length; 115 failprob = sc->sc_rfailprob; 116 break; 117 case BIO_WRITE: 118 sc->sc_writes++; 119 sc->sc_wrotebytes += bp->bio_length; 120 failprob = sc->sc_wfailprob; 121 break; 122 } 123 mtx_unlock(&sc->sc_lock); 124 if (failprob > 0) { 125 u_int rval; 126 127 rval = arc4random() % 100; 128 if (rval < failprob) { 129 G_NOP_LOGREQLVL(1, bp, "Returning error=%d.", sc->sc_error); 130 g_io_deliver(bp, sc->sc_error); 131 return; 132 } 133 } 134 cbp = g_clone_bio(bp); 135 if (cbp == NULL) { 136 g_io_deliver(bp, ENOMEM); 137 return; 138 } 139 cbp->bio_done = g_std_done; 140 cbp->bio_offset = bp->bio_offset + sc->sc_offset; 141 pp = LIST_FIRST(&gp->provider); 142 KASSERT(pp != NULL, ("NULL pp")); 143 cbp->bio_to = pp; 144 G_NOP_LOGREQ(cbp, "Sending request."); 145 g_io_request(cbp, LIST_FIRST(&gp->consumer)); 146 } 147 148 static int 149 g_nop_access(struct g_provider *pp, int dr, int dw, int de) 150 { 151 struct g_geom *gp; 152 struct g_consumer *cp; 153 int error; 154 155 gp = pp->geom; 156 cp = LIST_FIRST(&gp->consumer); 157 error = g_access(cp, dr, dw, de); 158 159 return (error); 160 } 161 162 static int 163 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp, 164 int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size, 165 u_int secsize) 166 { 167 struct g_nop_softc *sc; 168 struct g_geom *gp; 169 struct g_provider *newpp; 170 struct g_consumer *cp; 171 char name[64]; 172 int error; 173 off_t explicitsize; 174 175 g_topology_assert(); 176 177 gp = NULL; 178 newpp = NULL; 179 cp = NULL; 180 181 if ((offset % pp->sectorsize) != 0) { 182 gctl_error(req, "Invalid offset for provider %s.", pp->name); 183 return (EINVAL); 184 } 185 if ((size % pp->sectorsize) != 0) { 186 gctl_error(req, "Invalid size for provider %s.", pp->name); 187 return (EINVAL); 188 } 189 if (offset >= pp->mediasize) { 190 gctl_error(req, "Invalid offset for provider %s.", pp->name); 191 return (EINVAL); 192 } 193 explicitsize = size; 194 if (size == 0) 195 size = pp->mediasize - offset; 196 if (offset + size > pp->mediasize) { 197 gctl_error(req, "Invalid size for provider %s.", pp->name); 198 return (EINVAL); 199 } 200 if (secsize == 0) 201 secsize = pp->sectorsize; 202 else if ((secsize % pp->sectorsize) != 0) { 203 gctl_error(req, "Invalid secsize for provider %s.", pp->name); 204 return (EINVAL); 205 } 206 if (secsize > MAXPHYS) { 207 gctl_error(req, "secsize is too big."); 208 return (EINVAL); 209 } 210 size -= size % secsize; 211 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX); 212 LIST_FOREACH(gp, &mp->geom, geom) { 213 if (strcmp(gp->name, name) == 0) { 214 gctl_error(req, "Provider %s already exists.", name); 215 return (EEXIST); 216 } 217 } 218 gp = g_new_geomf(mp, "%s", name); 219 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 220 sc->sc_offset = offset; 221 sc->sc_explicitsize = explicitsize; 222 sc->sc_error = ioerror; 223 sc->sc_rfailprob = rfailprob; 224 sc->sc_wfailprob = wfailprob; 225 sc->sc_reads = 0; 226 sc->sc_writes = 0; 227 sc->sc_readbytes = 0; 228 sc->sc_wrotebytes = 0; 229 mtx_init(&sc->sc_lock, "gnop lock", NULL, MTX_DEF); 230 gp->softc = sc; 231 gp->start = g_nop_start; 232 gp->orphan = g_nop_orphan; 233 gp->resize = g_nop_resize; 234 gp->access = g_nop_access; 235 gp->dumpconf = g_nop_dumpconf; 236 237 newpp = g_new_providerf(gp, "%s", gp->name); 238 newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 239 newpp->mediasize = size; 240 newpp->sectorsize = secsize; 241 242 cp = g_new_consumer(gp); 243 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 244 error = g_attach(cp, pp); 245 if (error != 0) { 246 gctl_error(req, "Cannot attach to provider %s.", pp->name); 247 goto fail; 248 } 249 250 newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED; 251 g_error_provider(newpp, 0); 252 G_NOP_DEBUG(0, "Device %s created.", gp->name); 253 return (0); 254 fail: 255 if (cp->provider != NULL) 256 g_detach(cp); 257 g_destroy_consumer(cp); 258 g_destroy_provider(newpp); 259 mtx_destroy(&sc->sc_lock); 260 g_free(gp->softc); 261 g_destroy_geom(gp); 262 return (error); 263 } 264 265 static int 266 g_nop_destroy(struct g_geom *gp, boolean_t force) 267 { 268 struct g_nop_softc *sc; 269 struct g_provider *pp; 270 271 g_topology_assert(); 272 sc = gp->softc; 273 if (sc == NULL) 274 return (ENXIO); 275 pp = LIST_FIRST(&gp->provider); 276 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 277 if (force) { 278 G_NOP_DEBUG(0, "Device %s is still open, so it " 279 "can't be definitely removed.", pp->name); 280 } else { 281 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).", 282 pp->name, pp->acr, pp->acw, pp->ace); 283 return (EBUSY); 284 } 285 } else { 286 G_NOP_DEBUG(0, "Device %s removed.", gp->name); 287 } 288 gp->softc = NULL; 289 mtx_destroy(&sc->sc_lock); 290 g_free(sc); 291 g_wither_geom(gp, ENXIO); 292 293 return (0); 294 } 295 296 static int 297 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 298 { 299 300 return (g_nop_destroy(gp, 0)); 301 } 302 303 static void 304 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp) 305 { 306 struct g_provider *pp; 307 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size; 308 const char *name; 309 char param[16]; 310 int i, *nargs; 311 312 g_topology_assert(); 313 314 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 315 if (nargs == NULL) { 316 gctl_error(req, "No '%s' argument", "nargs"); 317 return; 318 } 319 if (*nargs <= 0) { 320 gctl_error(req, "Missing device(s)."); 321 return; 322 } 323 error = gctl_get_paraml(req, "error", sizeof(*error)); 324 if (error == NULL) { 325 gctl_error(req, "No '%s' argument", "error"); 326 return; 327 } 328 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 329 if (rfailprob == NULL) { 330 gctl_error(req, "No '%s' argument", "rfailprob"); 331 return; 332 } 333 if (*rfailprob < -1 || *rfailprob > 100) { 334 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 335 return; 336 } 337 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 338 if (wfailprob == NULL) { 339 gctl_error(req, "No '%s' argument", "wfailprob"); 340 return; 341 } 342 if (*wfailprob < -1 || *wfailprob > 100) { 343 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 344 return; 345 } 346 offset = gctl_get_paraml(req, "offset", sizeof(*offset)); 347 if (offset == NULL) { 348 gctl_error(req, "No '%s' argument", "offset"); 349 return; 350 } 351 if (*offset < 0) { 352 gctl_error(req, "Invalid '%s' argument", "offset"); 353 return; 354 } 355 size = gctl_get_paraml(req, "size", sizeof(*size)); 356 if (size == NULL) { 357 gctl_error(req, "No '%s' argument", "size"); 358 return; 359 } 360 if (*size < 0) { 361 gctl_error(req, "Invalid '%s' argument", "size"); 362 return; 363 } 364 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize)); 365 if (secsize == NULL) { 366 gctl_error(req, "No '%s' argument", "secsize"); 367 return; 368 } 369 if (*secsize < 0) { 370 gctl_error(req, "Invalid '%s' argument", "secsize"); 371 return; 372 } 373 374 for (i = 0; i < *nargs; i++) { 375 snprintf(param, sizeof(param), "arg%d", i); 376 name = gctl_get_asciiparam(req, param); 377 if (name == NULL) { 378 gctl_error(req, "No 'arg%d' argument", i); 379 return; 380 } 381 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 382 name += strlen("/dev/"); 383 pp = g_provider_by_name(name); 384 if (pp == NULL) { 385 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 386 gctl_error(req, "Provider %s is invalid.", name); 387 return; 388 } 389 if (g_nop_create(req, mp, pp, 390 *error == -1 ? EIO : (int)*error, 391 *rfailprob == -1 ? 0 : (u_int)*rfailprob, 392 *wfailprob == -1 ? 0 : (u_int)*wfailprob, 393 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) { 394 return; 395 } 396 } 397 } 398 399 static void 400 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp) 401 { 402 struct g_nop_softc *sc; 403 struct g_provider *pp; 404 intmax_t *error, *rfailprob, *wfailprob; 405 const char *name; 406 char param[16]; 407 int i, *nargs; 408 409 g_topology_assert(); 410 411 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 412 if (nargs == NULL) { 413 gctl_error(req, "No '%s' argument", "nargs"); 414 return; 415 } 416 if (*nargs <= 0) { 417 gctl_error(req, "Missing device(s)."); 418 return; 419 } 420 error = gctl_get_paraml(req, "error", sizeof(*error)); 421 if (error == NULL) { 422 gctl_error(req, "No '%s' argument", "error"); 423 return; 424 } 425 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 426 if (rfailprob == NULL) { 427 gctl_error(req, "No '%s' argument", "rfailprob"); 428 return; 429 } 430 if (*rfailprob < -1 || *rfailprob > 100) { 431 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 432 return; 433 } 434 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 435 if (wfailprob == NULL) { 436 gctl_error(req, "No '%s' argument", "wfailprob"); 437 return; 438 } 439 if (*wfailprob < -1 || *wfailprob > 100) { 440 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 441 return; 442 } 443 444 for (i = 0; i < *nargs; i++) { 445 snprintf(param, sizeof(param), "arg%d", i); 446 name = gctl_get_asciiparam(req, param); 447 if (name == NULL) { 448 gctl_error(req, "No 'arg%d' argument", i); 449 return; 450 } 451 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 452 name += strlen("/dev/"); 453 pp = g_provider_by_name(name); 454 if (pp == NULL || pp->geom->class != mp) { 455 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 456 gctl_error(req, "Provider %s is invalid.", name); 457 return; 458 } 459 sc = pp->geom->softc; 460 if (*error != -1) 461 sc->sc_error = (int)*error; 462 if (*rfailprob != -1) 463 sc->sc_rfailprob = (u_int)*rfailprob; 464 if (*wfailprob != -1) 465 sc->sc_wfailprob = (u_int)*wfailprob; 466 } 467 } 468 469 static struct g_geom * 470 g_nop_find_geom(struct g_class *mp, const char *name) 471 { 472 struct g_geom *gp; 473 474 LIST_FOREACH(gp, &mp->geom, geom) { 475 if (strcmp(gp->name, name) == 0) 476 return (gp); 477 } 478 return (NULL); 479 } 480 481 static void 482 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp) 483 { 484 int *nargs, *force, error, i; 485 struct g_geom *gp; 486 const char *name; 487 char param[16]; 488 489 g_topology_assert(); 490 491 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 492 if (nargs == NULL) { 493 gctl_error(req, "No '%s' argument", "nargs"); 494 return; 495 } 496 if (*nargs <= 0) { 497 gctl_error(req, "Missing device(s)."); 498 return; 499 } 500 force = gctl_get_paraml(req, "force", sizeof(*force)); 501 if (force == NULL) { 502 gctl_error(req, "No 'force' argument"); 503 return; 504 } 505 506 for (i = 0; i < *nargs; i++) { 507 snprintf(param, sizeof(param), "arg%d", i); 508 name = gctl_get_asciiparam(req, param); 509 if (name == NULL) { 510 gctl_error(req, "No 'arg%d' argument", i); 511 return; 512 } 513 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 514 name += strlen("/dev/"); 515 gp = g_nop_find_geom(mp, name); 516 if (gp == NULL) { 517 G_NOP_DEBUG(1, "Device %s is invalid.", name); 518 gctl_error(req, "Device %s is invalid.", name); 519 return; 520 } 521 error = g_nop_destroy(gp, *force); 522 if (error != 0) { 523 gctl_error(req, "Cannot destroy device %s (error=%d).", 524 gp->name, error); 525 return; 526 } 527 } 528 } 529 530 static void 531 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp) 532 { 533 struct g_nop_softc *sc; 534 struct g_provider *pp; 535 const char *name; 536 char param[16]; 537 int i, *nargs; 538 539 g_topology_assert(); 540 541 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 542 if (nargs == NULL) { 543 gctl_error(req, "No '%s' argument", "nargs"); 544 return; 545 } 546 if (*nargs <= 0) { 547 gctl_error(req, "Missing device(s)."); 548 return; 549 } 550 551 for (i = 0; i < *nargs; i++) { 552 snprintf(param, sizeof(param), "arg%d", i); 553 name = gctl_get_asciiparam(req, param); 554 if (name == NULL) { 555 gctl_error(req, "No 'arg%d' argument", i); 556 return; 557 } 558 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 559 name += strlen("/dev/"); 560 pp = g_provider_by_name(name); 561 if (pp == NULL || pp->geom->class != mp) { 562 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 563 gctl_error(req, "Provider %s is invalid.", name); 564 return; 565 } 566 sc = pp->geom->softc; 567 sc->sc_reads = 0; 568 sc->sc_writes = 0; 569 sc->sc_readbytes = 0; 570 sc->sc_wrotebytes = 0; 571 } 572 } 573 574 static void 575 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb) 576 { 577 uint32_t *version; 578 579 g_topology_assert(); 580 581 version = gctl_get_paraml(req, "version", sizeof(*version)); 582 if (version == NULL) { 583 gctl_error(req, "No '%s' argument.", "version"); 584 return; 585 } 586 if (*version != G_NOP_VERSION) { 587 gctl_error(req, "Userland and kernel parts are out of sync."); 588 return; 589 } 590 591 if (strcmp(verb, "create") == 0) { 592 g_nop_ctl_create(req, mp); 593 return; 594 } else if (strcmp(verb, "configure") == 0) { 595 g_nop_ctl_configure(req, mp); 596 return; 597 } else if (strcmp(verb, "destroy") == 0) { 598 g_nop_ctl_destroy(req, mp); 599 return; 600 } else if (strcmp(verb, "reset") == 0) { 601 g_nop_ctl_reset(req, mp); 602 return; 603 } 604 605 gctl_error(req, "Unknown verb."); 606 } 607 608 static void 609 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 610 struct g_consumer *cp, struct g_provider *pp) 611 { 612 struct g_nop_softc *sc; 613 614 if (pp != NULL || cp != NULL) 615 return; 616 sc = gp->softc; 617 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent, 618 (intmax_t)sc->sc_offset); 619 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent, 620 sc->sc_rfailprob); 621 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent, 622 sc->sc_wfailprob); 623 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error); 624 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads); 625 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes); 626 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent, 627 sc->sc_readbytes); 628 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent, 629 sc->sc_wrotebytes); 630 } 631 632 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
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