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/8.1/sys/geom/nop/g_nop.c 162153 2006-09-08 13:46:18Z pjd $"); 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/sysctl.h> 38 #include <sys/malloc.h> 39 #include <geom/geom.h> 40 #include <geom/nop/g_nop.h> 41 42 43 SYSCTL_DECL(_kern_geom); 44 SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff"); 45 static u_int g_nop_debug = 0; 46 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0, 47 "Debug level"); 48 49 static int g_nop_destroy(struct g_geom *gp, boolean_t force); 50 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, 51 struct g_geom *gp); 52 static void g_nop_config(struct gctl_req *req, struct g_class *mp, 53 const char *verb); 54 static void g_nop_dumpconf(struct sbuf *sb, const char *indent, 55 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 56 57 struct g_class g_nop_class = { 58 .name = G_NOP_CLASS_NAME, 59 .version = G_VERSION, 60 .ctlreq = g_nop_config, 61 .destroy_geom = g_nop_destroy_geom 62 }; 63 64 65 static void 66 g_nop_orphan(struct g_consumer *cp) 67 { 68 69 g_topology_assert(); 70 g_nop_destroy(cp->geom, 1); 71 } 72 73 static void 74 g_nop_start(struct bio *bp) 75 { 76 struct g_nop_softc *sc; 77 struct g_geom *gp; 78 struct g_provider *pp; 79 struct bio *cbp; 80 u_int failprob = 0; 81 82 gp = bp->bio_to->geom; 83 sc = gp->softc; 84 G_NOP_LOGREQ(bp, "Request received."); 85 switch (bp->bio_cmd) { 86 case BIO_READ: 87 sc->sc_reads++; 88 sc->sc_readbytes += bp->bio_length; 89 failprob = sc->sc_rfailprob; 90 break; 91 case BIO_WRITE: 92 sc->sc_writes++; 93 sc->sc_wrotebytes += bp->bio_length; 94 failprob = sc->sc_wfailprob; 95 break; 96 } 97 if (failprob > 0) { 98 u_int rval; 99 100 rval = arc4random() % 100; 101 if (rval < failprob) { 102 G_NOP_LOGREQ(bp, "Returning error=%d.", sc->sc_error); 103 g_io_deliver(bp, sc->sc_error); 104 return; 105 } 106 } 107 cbp = g_clone_bio(bp); 108 if (cbp == NULL) { 109 g_io_deliver(bp, ENOMEM); 110 return; 111 } 112 cbp->bio_done = g_std_done; 113 cbp->bio_offset = bp->bio_offset + sc->sc_offset; 114 cbp->bio_data = bp->bio_data; 115 cbp->bio_length = bp->bio_length; 116 pp = LIST_FIRST(&gp->provider); 117 KASSERT(pp != NULL, ("NULL pp")); 118 cbp->bio_to = pp; 119 G_NOP_LOGREQ(cbp, "Sending request."); 120 g_io_request(cbp, LIST_FIRST(&gp->consumer)); 121 } 122 123 static int 124 g_nop_access(struct g_provider *pp, int dr, int dw, int de) 125 { 126 struct g_geom *gp; 127 struct g_consumer *cp; 128 int error; 129 130 gp = pp->geom; 131 cp = LIST_FIRST(&gp->consumer); 132 error = g_access(cp, dr, dw, de); 133 134 return (error); 135 } 136 137 static int 138 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp, 139 int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size, 140 u_int secsize) 141 { 142 struct g_nop_softc *sc; 143 struct g_geom *gp; 144 struct g_provider *newpp; 145 struct g_consumer *cp; 146 char name[64]; 147 int error; 148 149 g_topology_assert(); 150 151 gp = NULL; 152 newpp = NULL; 153 cp = NULL; 154 155 if ((offset % pp->sectorsize) != 0) { 156 gctl_error(req, "Invalid offset for provider %s.", pp->name); 157 return (EINVAL); 158 } 159 if ((size % pp->sectorsize) != 0) { 160 gctl_error(req, "Invalid size for provider %s.", pp->name); 161 return (EINVAL); 162 } 163 if (offset >= pp->mediasize) { 164 gctl_error(req, "Invalid offset for provider %s.", pp->name); 165 return (EINVAL); 166 } 167 if (size == 0) 168 size = pp->mediasize - offset; 169 if (offset + size > pp->mediasize) { 170 gctl_error(req, "Invalid size for provider %s.", pp->name); 171 return (EINVAL); 172 } 173 if (secsize == 0) 174 secsize = pp->sectorsize; 175 else if ((secsize % pp->sectorsize) != 0) { 176 gctl_error(req, "Invalid secsize for provider %s.", pp->name); 177 return (EINVAL); 178 } 179 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX); 180 LIST_FOREACH(gp, &mp->geom, geom) { 181 if (strcmp(gp->name, name) == 0) { 182 gctl_error(req, "Provider %s already exists.", name); 183 return (EEXIST); 184 } 185 } 186 gp = g_new_geomf(mp, name); 187 if (gp == NULL) { 188 gctl_error(req, "Cannot create geom %s.", name); 189 return (ENOMEM); 190 } 191 sc = g_malloc(sizeof(*sc), M_WAITOK); 192 sc->sc_offset = offset; 193 sc->sc_error = ioerror; 194 sc->sc_rfailprob = rfailprob; 195 sc->sc_wfailprob = wfailprob; 196 sc->sc_reads = 0; 197 sc->sc_writes = 0; 198 sc->sc_readbytes = 0; 199 sc->sc_wrotebytes = 0; 200 gp->softc = sc; 201 gp->start = g_nop_start; 202 gp->orphan = g_nop_orphan; 203 gp->access = g_nop_access; 204 gp->dumpconf = g_nop_dumpconf; 205 206 newpp = g_new_providerf(gp, gp->name); 207 if (newpp == NULL) { 208 gctl_error(req, "Cannot create provider %s.", name); 209 error = ENOMEM; 210 goto fail; 211 } 212 newpp->mediasize = size; 213 newpp->sectorsize = secsize; 214 215 cp = g_new_consumer(gp); 216 if (cp == NULL) { 217 gctl_error(req, "Cannot create consumer for %s.", gp->name); 218 error = ENOMEM; 219 goto fail; 220 } 221 error = g_attach(cp, pp); 222 if (error != 0) { 223 gctl_error(req, "Cannot attach to provider %s.", pp->name); 224 goto fail; 225 } 226 227 g_error_provider(newpp, 0); 228 G_NOP_DEBUG(0, "Device %s created.", gp->name); 229 return (0); 230 fail: 231 if (cp != NULL) { 232 if (cp->provider != NULL) 233 g_detach(cp); 234 g_destroy_consumer(cp); 235 } 236 if (newpp != NULL) 237 g_destroy_provider(newpp); 238 if (gp != NULL) { 239 if (gp->softc != NULL) 240 g_free(gp->softc); 241 g_destroy_geom(gp); 242 } 243 return (error); 244 } 245 246 static int 247 g_nop_destroy(struct g_geom *gp, boolean_t force) 248 { 249 struct g_provider *pp; 250 251 g_topology_assert(); 252 if (gp->softc == NULL) 253 return (ENXIO); 254 pp = LIST_FIRST(&gp->provider); 255 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 256 if (force) { 257 G_NOP_DEBUG(0, "Device %s is still open, so it " 258 "can't be definitely removed.", pp->name); 259 } else { 260 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).", 261 pp->name, pp->acr, pp->acw, pp->ace); 262 return (EBUSY); 263 } 264 } else { 265 G_NOP_DEBUG(0, "Device %s removed.", gp->name); 266 } 267 g_free(gp->softc); 268 gp->softc = NULL; 269 g_wither_geom(gp, ENXIO); 270 271 return (0); 272 } 273 274 static int 275 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 276 { 277 278 return (g_nop_destroy(gp, 0)); 279 } 280 281 static void 282 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp) 283 { 284 struct g_provider *pp; 285 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size; 286 const char *name; 287 char param[16]; 288 int i, *nargs; 289 290 g_topology_assert(); 291 292 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 293 if (nargs == NULL) { 294 gctl_error(req, "No '%s' argument", "nargs"); 295 return; 296 } 297 if (*nargs <= 0) { 298 gctl_error(req, "Missing device(s)."); 299 return; 300 } 301 error = gctl_get_paraml(req, "error", sizeof(*error)); 302 if (error == NULL) { 303 gctl_error(req, "No '%s' argument", "error"); 304 return; 305 } 306 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 307 if (rfailprob == NULL) { 308 gctl_error(req, "No '%s' argument", "rfailprob"); 309 return; 310 } 311 if (*rfailprob < -1 || *rfailprob > 100) { 312 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 313 return; 314 } 315 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 316 if (wfailprob == NULL) { 317 gctl_error(req, "No '%s' argument", "wfailprob"); 318 return; 319 } 320 if (*wfailprob < -1 || *wfailprob > 100) { 321 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 322 return; 323 } 324 offset = gctl_get_paraml(req, "offset", sizeof(*offset)); 325 if (offset == NULL) { 326 gctl_error(req, "No '%s' argument", "offset"); 327 return; 328 } 329 if (*offset < 0) { 330 gctl_error(req, "Invalid '%s' argument", "offset"); 331 return; 332 } 333 size = gctl_get_paraml(req, "size", sizeof(*size)); 334 if (size == NULL) { 335 gctl_error(req, "No '%s' argument", "size"); 336 return; 337 } 338 if (*size < 0) { 339 gctl_error(req, "Invalid '%s' argument", "size"); 340 return; 341 } 342 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize)); 343 if (secsize == NULL) { 344 gctl_error(req, "No '%s' argument", "secsize"); 345 return; 346 } 347 if (*secsize < 0) { 348 gctl_error(req, "Invalid '%s' argument", "secsize"); 349 return; 350 } 351 352 for (i = 0; i < *nargs; i++) { 353 snprintf(param, sizeof(param), "arg%d", i); 354 name = gctl_get_asciiparam(req, param); 355 if (name == NULL) { 356 gctl_error(req, "No 'arg%d' argument", i); 357 return; 358 } 359 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 360 name += strlen("/dev/"); 361 pp = g_provider_by_name(name); 362 if (pp == NULL) { 363 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 364 gctl_error(req, "Provider %s is invalid.", name); 365 return; 366 } 367 if (g_nop_create(req, mp, pp, 368 *error == -1 ? EIO : (int)*error, 369 *rfailprob == -1 ? 0 : (u_int)*rfailprob, 370 *wfailprob == -1 ? 0 : (u_int)*wfailprob, 371 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) { 372 return; 373 } 374 } 375 } 376 377 static void 378 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp) 379 { 380 struct g_nop_softc *sc; 381 struct g_provider *pp; 382 intmax_t *error, *rfailprob, *wfailprob; 383 const char *name; 384 char param[16]; 385 int i, *nargs; 386 387 g_topology_assert(); 388 389 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 390 if (nargs == NULL) { 391 gctl_error(req, "No '%s' argument", "nargs"); 392 return; 393 } 394 if (*nargs <= 0) { 395 gctl_error(req, "Missing device(s)."); 396 return; 397 } 398 error = gctl_get_paraml(req, "error", sizeof(*error)); 399 if (error == NULL) { 400 gctl_error(req, "No '%s' argument", "error"); 401 return; 402 } 403 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 404 if (rfailprob == NULL) { 405 gctl_error(req, "No '%s' argument", "rfailprob"); 406 return; 407 } 408 if (*rfailprob < -1 || *rfailprob > 100) { 409 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 410 return; 411 } 412 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 413 if (wfailprob == NULL) { 414 gctl_error(req, "No '%s' argument", "wfailprob"); 415 return; 416 } 417 if (*wfailprob < -1 || *wfailprob > 100) { 418 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 419 return; 420 } 421 422 for (i = 0; i < *nargs; i++) { 423 snprintf(param, sizeof(param), "arg%d", i); 424 name = gctl_get_asciiparam(req, param); 425 if (name == NULL) { 426 gctl_error(req, "No 'arg%d' argument", i); 427 return; 428 } 429 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 430 name += strlen("/dev/"); 431 pp = g_provider_by_name(name); 432 if (pp == NULL || pp->geom->class != mp) { 433 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 434 gctl_error(req, "Provider %s is invalid.", name); 435 return; 436 } 437 sc = pp->geom->softc; 438 if (*error != -1) 439 sc->sc_error = (int)*error; 440 if (*rfailprob != -1) 441 sc->sc_rfailprob = (u_int)*rfailprob; 442 if (*wfailprob != -1) 443 sc->sc_wfailprob = (u_int)*wfailprob; 444 } 445 } 446 447 static struct g_geom * 448 g_nop_find_geom(struct g_class *mp, const char *name) 449 { 450 struct g_geom *gp; 451 452 LIST_FOREACH(gp, &mp->geom, geom) { 453 if (strcmp(gp->name, name) == 0) 454 return (gp); 455 } 456 return (NULL); 457 } 458 459 static void 460 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp) 461 { 462 int *nargs, *force, error, i; 463 struct g_geom *gp; 464 const char *name; 465 char param[16]; 466 467 g_topology_assert(); 468 469 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 470 if (nargs == NULL) { 471 gctl_error(req, "No '%s' argument", "nargs"); 472 return; 473 } 474 if (*nargs <= 0) { 475 gctl_error(req, "Missing device(s)."); 476 return; 477 } 478 force = gctl_get_paraml(req, "force", sizeof(*force)); 479 if (force == NULL) { 480 gctl_error(req, "No 'force' argument"); 481 return; 482 } 483 484 for (i = 0; i < *nargs; i++) { 485 snprintf(param, sizeof(param), "arg%d", i); 486 name = gctl_get_asciiparam(req, param); 487 if (name == NULL) { 488 gctl_error(req, "No 'arg%d' argument", i); 489 return; 490 } 491 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 492 name += strlen("/dev/"); 493 gp = g_nop_find_geom(mp, name); 494 if (gp == NULL) { 495 G_NOP_DEBUG(1, "Device %s is invalid.", name); 496 gctl_error(req, "Device %s is invalid.", name); 497 return; 498 } 499 error = g_nop_destroy(gp, *force); 500 if (error != 0) { 501 gctl_error(req, "Cannot destroy device %s (error=%d).", 502 gp->name, error); 503 return; 504 } 505 } 506 } 507 508 static void 509 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp) 510 { 511 struct g_nop_softc *sc; 512 struct g_provider *pp; 513 const char *name; 514 char param[16]; 515 int i, *nargs; 516 517 g_topology_assert(); 518 519 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 520 if (nargs == NULL) { 521 gctl_error(req, "No '%s' argument", "nargs"); 522 return; 523 } 524 if (*nargs <= 0) { 525 gctl_error(req, "Missing device(s)."); 526 return; 527 } 528 529 for (i = 0; i < *nargs; i++) { 530 snprintf(param, sizeof(param), "arg%d", i); 531 name = gctl_get_asciiparam(req, param); 532 if (name == NULL) { 533 gctl_error(req, "No 'arg%d' argument", i); 534 return; 535 } 536 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 537 name += strlen("/dev/"); 538 pp = g_provider_by_name(name); 539 if (pp == NULL || pp->geom->class != mp) { 540 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 541 gctl_error(req, "Provider %s is invalid.", name); 542 return; 543 } 544 sc = pp->geom->softc; 545 sc->sc_reads = 0; 546 sc->sc_writes = 0; 547 sc->sc_readbytes = 0; 548 sc->sc_wrotebytes = 0; 549 } 550 } 551 552 static void 553 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb) 554 { 555 uint32_t *version; 556 557 g_topology_assert(); 558 559 version = gctl_get_paraml(req, "version", sizeof(*version)); 560 if (version == NULL) { 561 gctl_error(req, "No '%s' argument.", "version"); 562 return; 563 } 564 if (*version != G_NOP_VERSION) { 565 gctl_error(req, "Userland and kernel parts are out of sync."); 566 return; 567 } 568 569 if (strcmp(verb, "create") == 0) { 570 g_nop_ctl_create(req, mp); 571 return; 572 } else if (strcmp(verb, "configure") == 0) { 573 g_nop_ctl_configure(req, mp); 574 return; 575 } else if (strcmp(verb, "destroy") == 0) { 576 g_nop_ctl_destroy(req, mp); 577 return; 578 } else if (strcmp(verb, "reset") == 0) { 579 g_nop_ctl_reset(req, mp); 580 return; 581 } 582 583 gctl_error(req, "Unknown verb."); 584 } 585 586 static void 587 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 588 struct g_consumer *cp, struct g_provider *pp) 589 { 590 struct g_nop_softc *sc; 591 592 if (pp != NULL || cp != NULL) 593 return; 594 sc = gp->softc; 595 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent, 596 (intmax_t)sc->sc_offset); 597 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent, 598 sc->sc_rfailprob); 599 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent, 600 sc->sc_wfailprob); 601 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error); 602 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads); 603 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes); 604 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent, 605 sc->sc_readbytes); 606 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent, 607 sc->sc_wrotebytes); 608 } 609 610 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
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