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/10.0/sys/geom/nop/g_nop.c 258505 2013-11-23 23:54:38Z mjg $"); 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 switch (bp->bio_cmd) { 111 case BIO_READ: 112 sc->sc_reads++; 113 sc->sc_readbytes += bp->bio_length; 114 failprob = sc->sc_rfailprob; 115 break; 116 case BIO_WRITE: 117 sc->sc_writes++; 118 sc->sc_wrotebytes += bp->bio_length; 119 failprob = sc->sc_wfailprob; 120 break; 121 } 122 if (failprob > 0) { 123 u_int rval; 124 125 rval = arc4random() % 100; 126 if (rval < failprob) { 127 G_NOP_LOGREQLVL(1, bp, "Returning error=%d.", sc->sc_error); 128 g_io_deliver(bp, sc->sc_error); 129 return; 130 } 131 } 132 cbp = g_clone_bio(bp); 133 if (cbp == NULL) { 134 g_io_deliver(bp, ENOMEM); 135 return; 136 } 137 cbp->bio_done = g_std_done; 138 cbp->bio_offset = bp->bio_offset + sc->sc_offset; 139 pp = LIST_FIRST(&gp->provider); 140 KASSERT(pp != NULL, ("NULL pp")); 141 cbp->bio_to = pp; 142 G_NOP_LOGREQ(cbp, "Sending request."); 143 g_io_request(cbp, LIST_FIRST(&gp->consumer)); 144 } 145 146 static int 147 g_nop_access(struct g_provider *pp, int dr, int dw, int de) 148 { 149 struct g_geom *gp; 150 struct g_consumer *cp; 151 int error; 152 153 gp = pp->geom; 154 cp = LIST_FIRST(&gp->consumer); 155 error = g_access(cp, dr, dw, de); 156 157 return (error); 158 } 159 160 static int 161 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp, 162 int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size, 163 u_int secsize) 164 { 165 struct g_nop_softc *sc; 166 struct g_geom *gp; 167 struct g_provider *newpp; 168 struct g_consumer *cp; 169 char name[64]; 170 int error; 171 off_t explicitsize; 172 173 g_topology_assert(); 174 175 gp = NULL; 176 newpp = NULL; 177 cp = NULL; 178 179 if ((offset % pp->sectorsize) != 0) { 180 gctl_error(req, "Invalid offset for provider %s.", pp->name); 181 return (EINVAL); 182 } 183 if ((size % pp->sectorsize) != 0) { 184 gctl_error(req, "Invalid size for provider %s.", pp->name); 185 return (EINVAL); 186 } 187 if (offset >= pp->mediasize) { 188 gctl_error(req, "Invalid offset for provider %s.", pp->name); 189 return (EINVAL); 190 } 191 explicitsize = size; 192 if (size == 0) 193 size = pp->mediasize - offset; 194 if (offset + size > pp->mediasize) { 195 gctl_error(req, "Invalid size for provider %s.", pp->name); 196 return (EINVAL); 197 } 198 if (secsize == 0) 199 secsize = pp->sectorsize; 200 else if ((secsize % pp->sectorsize) != 0) { 201 gctl_error(req, "Invalid secsize for provider %s.", pp->name); 202 return (EINVAL); 203 } 204 if (secsize > MAXPHYS) { 205 gctl_error(req, "secsize is too big."); 206 return (EINVAL); 207 } 208 size -= size % secsize; 209 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX); 210 LIST_FOREACH(gp, &mp->geom, geom) { 211 if (strcmp(gp->name, name) == 0) { 212 gctl_error(req, "Provider %s already exists.", name); 213 return (EEXIST); 214 } 215 } 216 gp = g_new_geomf(mp, "%s", name); 217 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 218 sc->sc_offset = offset; 219 sc->sc_explicitsize = explicitsize; 220 sc->sc_error = ioerror; 221 sc->sc_rfailprob = rfailprob; 222 sc->sc_wfailprob = wfailprob; 223 sc->sc_reads = 0; 224 sc->sc_writes = 0; 225 sc->sc_readbytes = 0; 226 sc->sc_wrotebytes = 0; 227 gp->softc = sc; 228 gp->start = g_nop_start; 229 gp->orphan = g_nop_orphan; 230 gp->resize = g_nop_resize; 231 gp->access = g_nop_access; 232 gp->dumpconf = g_nop_dumpconf; 233 234 newpp = g_new_providerf(gp, "%s", gp->name); 235 newpp->mediasize = size; 236 newpp->sectorsize = secsize; 237 238 cp = g_new_consumer(gp); 239 error = g_attach(cp, pp); 240 if (error != 0) { 241 gctl_error(req, "Cannot attach to provider %s.", pp->name); 242 goto fail; 243 } 244 245 newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED; 246 g_error_provider(newpp, 0); 247 G_NOP_DEBUG(0, "Device %s created.", gp->name); 248 return (0); 249 fail: 250 if (cp->provider != NULL) 251 g_detach(cp); 252 g_destroy_consumer(cp); 253 g_destroy_provider(newpp); 254 g_free(gp->softc); 255 g_destroy_geom(gp); 256 return (error); 257 } 258 259 static int 260 g_nop_destroy(struct g_geom *gp, boolean_t force) 261 { 262 struct g_provider *pp; 263 264 g_topology_assert(); 265 if (gp->softc == NULL) 266 return (ENXIO); 267 pp = LIST_FIRST(&gp->provider); 268 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 269 if (force) { 270 G_NOP_DEBUG(0, "Device %s is still open, so it " 271 "can't be definitely removed.", pp->name); 272 } else { 273 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).", 274 pp->name, pp->acr, pp->acw, pp->ace); 275 return (EBUSY); 276 } 277 } else { 278 G_NOP_DEBUG(0, "Device %s removed.", gp->name); 279 } 280 g_free(gp->softc); 281 gp->softc = NULL; 282 g_wither_geom(gp, ENXIO); 283 284 return (0); 285 } 286 287 static int 288 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 289 { 290 291 return (g_nop_destroy(gp, 0)); 292 } 293 294 static void 295 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp) 296 { 297 struct g_provider *pp; 298 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size; 299 const char *name; 300 char param[16]; 301 int i, *nargs; 302 303 g_topology_assert(); 304 305 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 306 if (nargs == NULL) { 307 gctl_error(req, "No '%s' argument", "nargs"); 308 return; 309 } 310 if (*nargs <= 0) { 311 gctl_error(req, "Missing device(s)."); 312 return; 313 } 314 error = gctl_get_paraml(req, "error", sizeof(*error)); 315 if (error == NULL) { 316 gctl_error(req, "No '%s' argument", "error"); 317 return; 318 } 319 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 320 if (rfailprob == NULL) { 321 gctl_error(req, "No '%s' argument", "rfailprob"); 322 return; 323 } 324 if (*rfailprob < -1 || *rfailprob > 100) { 325 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 326 return; 327 } 328 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 329 if (wfailprob == NULL) { 330 gctl_error(req, "No '%s' argument", "wfailprob"); 331 return; 332 } 333 if (*wfailprob < -1 || *wfailprob > 100) { 334 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 335 return; 336 } 337 offset = gctl_get_paraml(req, "offset", sizeof(*offset)); 338 if (offset == NULL) { 339 gctl_error(req, "No '%s' argument", "offset"); 340 return; 341 } 342 if (*offset < 0) { 343 gctl_error(req, "Invalid '%s' argument", "offset"); 344 return; 345 } 346 size = gctl_get_paraml(req, "size", sizeof(*size)); 347 if (size == NULL) { 348 gctl_error(req, "No '%s' argument", "size"); 349 return; 350 } 351 if (*size < 0) { 352 gctl_error(req, "Invalid '%s' argument", "size"); 353 return; 354 } 355 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize)); 356 if (secsize == NULL) { 357 gctl_error(req, "No '%s' argument", "secsize"); 358 return; 359 } 360 if (*secsize < 0) { 361 gctl_error(req, "Invalid '%s' argument", "secsize"); 362 return; 363 } 364 365 for (i = 0; i < *nargs; i++) { 366 snprintf(param, sizeof(param), "arg%d", i); 367 name = gctl_get_asciiparam(req, param); 368 if (name == NULL) { 369 gctl_error(req, "No 'arg%d' argument", i); 370 return; 371 } 372 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 373 name += strlen("/dev/"); 374 pp = g_provider_by_name(name); 375 if (pp == NULL) { 376 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 377 gctl_error(req, "Provider %s is invalid.", name); 378 return; 379 } 380 if (g_nop_create(req, mp, pp, 381 *error == -1 ? EIO : (int)*error, 382 *rfailprob == -1 ? 0 : (u_int)*rfailprob, 383 *wfailprob == -1 ? 0 : (u_int)*wfailprob, 384 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) { 385 return; 386 } 387 } 388 } 389 390 static void 391 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp) 392 { 393 struct g_nop_softc *sc; 394 struct g_provider *pp; 395 intmax_t *error, *rfailprob, *wfailprob; 396 const char *name; 397 char param[16]; 398 int i, *nargs; 399 400 g_topology_assert(); 401 402 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 403 if (nargs == NULL) { 404 gctl_error(req, "No '%s' argument", "nargs"); 405 return; 406 } 407 if (*nargs <= 0) { 408 gctl_error(req, "Missing device(s)."); 409 return; 410 } 411 error = gctl_get_paraml(req, "error", sizeof(*error)); 412 if (error == NULL) { 413 gctl_error(req, "No '%s' argument", "error"); 414 return; 415 } 416 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 417 if (rfailprob == NULL) { 418 gctl_error(req, "No '%s' argument", "rfailprob"); 419 return; 420 } 421 if (*rfailprob < -1 || *rfailprob > 100) { 422 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 423 return; 424 } 425 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 426 if (wfailprob == NULL) { 427 gctl_error(req, "No '%s' argument", "wfailprob"); 428 return; 429 } 430 if (*wfailprob < -1 || *wfailprob > 100) { 431 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 432 return; 433 } 434 435 for (i = 0; i < *nargs; i++) { 436 snprintf(param, sizeof(param), "arg%d", i); 437 name = gctl_get_asciiparam(req, param); 438 if (name == NULL) { 439 gctl_error(req, "No 'arg%d' argument", i); 440 return; 441 } 442 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 443 name += strlen("/dev/"); 444 pp = g_provider_by_name(name); 445 if (pp == NULL || pp->geom->class != mp) { 446 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 447 gctl_error(req, "Provider %s is invalid.", name); 448 return; 449 } 450 sc = pp->geom->softc; 451 if (*error != -1) 452 sc->sc_error = (int)*error; 453 if (*rfailprob != -1) 454 sc->sc_rfailprob = (u_int)*rfailprob; 455 if (*wfailprob != -1) 456 sc->sc_wfailprob = (u_int)*wfailprob; 457 } 458 } 459 460 static struct g_geom * 461 g_nop_find_geom(struct g_class *mp, const char *name) 462 { 463 struct g_geom *gp; 464 465 LIST_FOREACH(gp, &mp->geom, geom) { 466 if (strcmp(gp->name, name) == 0) 467 return (gp); 468 } 469 return (NULL); 470 } 471 472 static void 473 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp) 474 { 475 int *nargs, *force, error, i; 476 struct g_geom *gp; 477 const char *name; 478 char param[16]; 479 480 g_topology_assert(); 481 482 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 483 if (nargs == NULL) { 484 gctl_error(req, "No '%s' argument", "nargs"); 485 return; 486 } 487 if (*nargs <= 0) { 488 gctl_error(req, "Missing device(s)."); 489 return; 490 } 491 force = gctl_get_paraml(req, "force", sizeof(*force)); 492 if (force == NULL) { 493 gctl_error(req, "No 'force' argument"); 494 return; 495 } 496 497 for (i = 0; i < *nargs; i++) { 498 snprintf(param, sizeof(param), "arg%d", i); 499 name = gctl_get_asciiparam(req, param); 500 if (name == NULL) { 501 gctl_error(req, "No 'arg%d' argument", i); 502 return; 503 } 504 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 505 name += strlen("/dev/"); 506 gp = g_nop_find_geom(mp, name); 507 if (gp == NULL) { 508 G_NOP_DEBUG(1, "Device %s is invalid.", name); 509 gctl_error(req, "Device %s is invalid.", name); 510 return; 511 } 512 error = g_nop_destroy(gp, *force); 513 if (error != 0) { 514 gctl_error(req, "Cannot destroy device %s (error=%d).", 515 gp->name, error); 516 return; 517 } 518 } 519 } 520 521 static void 522 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp) 523 { 524 struct g_nop_softc *sc; 525 struct g_provider *pp; 526 const char *name; 527 char param[16]; 528 int i, *nargs; 529 530 g_topology_assert(); 531 532 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 533 if (nargs == NULL) { 534 gctl_error(req, "No '%s' argument", "nargs"); 535 return; 536 } 537 if (*nargs <= 0) { 538 gctl_error(req, "Missing device(s)."); 539 return; 540 } 541 542 for (i = 0; i < *nargs; i++) { 543 snprintf(param, sizeof(param), "arg%d", i); 544 name = gctl_get_asciiparam(req, param); 545 if (name == NULL) { 546 gctl_error(req, "No 'arg%d' argument", i); 547 return; 548 } 549 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 550 name += strlen("/dev/"); 551 pp = g_provider_by_name(name); 552 if (pp == NULL || pp->geom->class != mp) { 553 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 554 gctl_error(req, "Provider %s is invalid.", name); 555 return; 556 } 557 sc = pp->geom->softc; 558 sc->sc_reads = 0; 559 sc->sc_writes = 0; 560 sc->sc_readbytes = 0; 561 sc->sc_wrotebytes = 0; 562 } 563 } 564 565 static void 566 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb) 567 { 568 uint32_t *version; 569 570 g_topology_assert(); 571 572 version = gctl_get_paraml(req, "version", sizeof(*version)); 573 if (version == NULL) { 574 gctl_error(req, "No '%s' argument.", "version"); 575 return; 576 } 577 if (*version != G_NOP_VERSION) { 578 gctl_error(req, "Userland and kernel parts are out of sync."); 579 return; 580 } 581 582 if (strcmp(verb, "create") == 0) { 583 g_nop_ctl_create(req, mp); 584 return; 585 } else if (strcmp(verb, "configure") == 0) { 586 g_nop_ctl_configure(req, mp); 587 return; 588 } else if (strcmp(verb, "destroy") == 0) { 589 g_nop_ctl_destroy(req, mp); 590 return; 591 } else if (strcmp(verb, "reset") == 0) { 592 g_nop_ctl_reset(req, mp); 593 return; 594 } 595 596 gctl_error(req, "Unknown verb."); 597 } 598 599 static void 600 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 601 struct g_consumer *cp, struct g_provider *pp) 602 { 603 struct g_nop_softc *sc; 604 605 if (pp != NULL || cp != NULL) 606 return; 607 sc = gp->softc; 608 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent, 609 (intmax_t)sc->sc_offset); 610 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent, 611 sc->sc_rfailprob); 612 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent, 613 sc->sc_wfailprob); 614 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error); 615 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads); 616 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes); 617 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent, 618 sc->sc_readbytes); 619 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent, 620 sc->sc_wrotebytes); 621 } 622 623 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
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