Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/geom/nop/g_nop.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/8.3/sys/geom/nop/g_nop.c 220407 2011-04-07 05:58:21Z ae $"); 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 if (secsize > MAXPHYS) { 180 gctl_error(req, "secsize is too big."); 181 return (EINVAL); 182 } 183 size -= size % secsize; 184 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX); 185 LIST_FOREACH(gp, &mp->geom, geom) { 186 if (strcmp(gp->name, name) == 0) { 187 gctl_error(req, "Provider %s already exists.", name); 188 return (EEXIST); 189 } 190 } 191 gp = g_new_geomf(mp, name); 192 sc = g_malloc(sizeof(*sc), M_WAITOK); 193 sc->sc_offset = offset; 194 sc->sc_error = ioerror; 195 sc->sc_rfailprob = rfailprob; 196 sc->sc_wfailprob = wfailprob; 197 sc->sc_reads = 0; 198 sc->sc_writes = 0; 199 sc->sc_readbytes = 0; 200 sc->sc_wrotebytes = 0; 201 gp->softc = sc; 202 gp->start = g_nop_start; 203 gp->orphan = g_nop_orphan; 204 gp->access = g_nop_access; 205 gp->dumpconf = g_nop_dumpconf; 206 207 newpp = g_new_providerf(gp, gp->name); 208 newpp->mediasize = size; 209 newpp->sectorsize = secsize; 210 211 cp = g_new_consumer(gp); 212 error = g_attach(cp, pp); 213 if (error != 0) { 214 gctl_error(req, "Cannot attach to provider %s.", pp->name); 215 goto fail; 216 } 217 218 g_error_provider(newpp, 0); 219 G_NOP_DEBUG(0, "Device %s created.", gp->name); 220 return (0); 221 fail: 222 if (cp->provider != NULL) 223 g_detach(cp); 224 g_destroy_consumer(cp); 225 g_destroy_provider(newpp); 226 g_free(gp->softc); 227 g_destroy_geom(gp); 228 return (error); 229 } 230 231 static int 232 g_nop_destroy(struct g_geom *gp, boolean_t force) 233 { 234 struct g_provider *pp; 235 236 g_topology_assert(); 237 if (gp->softc == NULL) 238 return (ENXIO); 239 pp = LIST_FIRST(&gp->provider); 240 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 241 if (force) { 242 G_NOP_DEBUG(0, "Device %s is still open, so it " 243 "can't be definitely removed.", pp->name); 244 } else { 245 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).", 246 pp->name, pp->acr, pp->acw, pp->ace); 247 return (EBUSY); 248 } 249 } else { 250 G_NOP_DEBUG(0, "Device %s removed.", gp->name); 251 } 252 g_free(gp->softc); 253 gp->softc = NULL; 254 g_wither_geom(gp, ENXIO); 255 256 return (0); 257 } 258 259 static int 260 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 261 { 262 263 return (g_nop_destroy(gp, 0)); 264 } 265 266 static void 267 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp) 268 { 269 struct g_provider *pp; 270 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size; 271 const char *name; 272 char param[16]; 273 int i, *nargs; 274 275 g_topology_assert(); 276 277 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 278 if (nargs == NULL) { 279 gctl_error(req, "No '%s' argument", "nargs"); 280 return; 281 } 282 if (*nargs <= 0) { 283 gctl_error(req, "Missing device(s)."); 284 return; 285 } 286 error = gctl_get_paraml(req, "error", sizeof(*error)); 287 if (error == NULL) { 288 gctl_error(req, "No '%s' argument", "error"); 289 return; 290 } 291 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 292 if (rfailprob == NULL) { 293 gctl_error(req, "No '%s' argument", "rfailprob"); 294 return; 295 } 296 if (*rfailprob < -1 || *rfailprob > 100) { 297 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 298 return; 299 } 300 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 301 if (wfailprob == NULL) { 302 gctl_error(req, "No '%s' argument", "wfailprob"); 303 return; 304 } 305 if (*wfailprob < -1 || *wfailprob > 100) { 306 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 307 return; 308 } 309 offset = gctl_get_paraml(req, "offset", sizeof(*offset)); 310 if (offset == NULL) { 311 gctl_error(req, "No '%s' argument", "offset"); 312 return; 313 } 314 if (*offset < 0) { 315 gctl_error(req, "Invalid '%s' argument", "offset"); 316 return; 317 } 318 size = gctl_get_paraml(req, "size", sizeof(*size)); 319 if (size == NULL) { 320 gctl_error(req, "No '%s' argument", "size"); 321 return; 322 } 323 if (*size < 0) { 324 gctl_error(req, "Invalid '%s' argument", "size"); 325 return; 326 } 327 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize)); 328 if (secsize == NULL) { 329 gctl_error(req, "No '%s' argument", "secsize"); 330 return; 331 } 332 if (*secsize < 0) { 333 gctl_error(req, "Invalid '%s' argument", "secsize"); 334 return; 335 } 336 337 for (i = 0; i < *nargs; i++) { 338 snprintf(param, sizeof(param), "arg%d", i); 339 name = gctl_get_asciiparam(req, param); 340 if (name == NULL) { 341 gctl_error(req, "No 'arg%d' argument", i); 342 return; 343 } 344 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 345 name += strlen("/dev/"); 346 pp = g_provider_by_name(name); 347 if (pp == NULL) { 348 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 349 gctl_error(req, "Provider %s is invalid.", name); 350 return; 351 } 352 if (g_nop_create(req, mp, pp, 353 *error == -1 ? EIO : (int)*error, 354 *rfailprob == -1 ? 0 : (u_int)*rfailprob, 355 *wfailprob == -1 ? 0 : (u_int)*wfailprob, 356 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) { 357 return; 358 } 359 } 360 } 361 362 static void 363 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp) 364 { 365 struct g_nop_softc *sc; 366 struct g_provider *pp; 367 intmax_t *error, *rfailprob, *wfailprob; 368 const char *name; 369 char param[16]; 370 int i, *nargs; 371 372 g_topology_assert(); 373 374 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 375 if (nargs == NULL) { 376 gctl_error(req, "No '%s' argument", "nargs"); 377 return; 378 } 379 if (*nargs <= 0) { 380 gctl_error(req, "Missing device(s)."); 381 return; 382 } 383 error = gctl_get_paraml(req, "error", sizeof(*error)); 384 if (error == NULL) { 385 gctl_error(req, "No '%s' argument", "error"); 386 return; 387 } 388 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); 389 if (rfailprob == NULL) { 390 gctl_error(req, "No '%s' argument", "rfailprob"); 391 return; 392 } 393 if (*rfailprob < -1 || *rfailprob > 100) { 394 gctl_error(req, "Invalid '%s' argument", "rfailprob"); 395 return; 396 } 397 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); 398 if (wfailprob == NULL) { 399 gctl_error(req, "No '%s' argument", "wfailprob"); 400 return; 401 } 402 if (*wfailprob < -1 || *wfailprob > 100) { 403 gctl_error(req, "Invalid '%s' argument", "wfailprob"); 404 return; 405 } 406 407 for (i = 0; i < *nargs; i++) { 408 snprintf(param, sizeof(param), "arg%d", i); 409 name = gctl_get_asciiparam(req, param); 410 if (name == NULL) { 411 gctl_error(req, "No 'arg%d' argument", i); 412 return; 413 } 414 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 415 name += strlen("/dev/"); 416 pp = g_provider_by_name(name); 417 if (pp == NULL || pp->geom->class != mp) { 418 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 419 gctl_error(req, "Provider %s is invalid.", name); 420 return; 421 } 422 sc = pp->geom->softc; 423 if (*error != -1) 424 sc->sc_error = (int)*error; 425 if (*rfailprob != -1) 426 sc->sc_rfailprob = (u_int)*rfailprob; 427 if (*wfailprob != -1) 428 sc->sc_wfailprob = (u_int)*wfailprob; 429 } 430 } 431 432 static struct g_geom * 433 g_nop_find_geom(struct g_class *mp, const char *name) 434 { 435 struct g_geom *gp; 436 437 LIST_FOREACH(gp, &mp->geom, geom) { 438 if (strcmp(gp->name, name) == 0) 439 return (gp); 440 } 441 return (NULL); 442 } 443 444 static void 445 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp) 446 { 447 int *nargs, *force, error, i; 448 struct g_geom *gp; 449 const char *name; 450 char param[16]; 451 452 g_topology_assert(); 453 454 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 455 if (nargs == NULL) { 456 gctl_error(req, "No '%s' argument", "nargs"); 457 return; 458 } 459 if (*nargs <= 0) { 460 gctl_error(req, "Missing device(s)."); 461 return; 462 } 463 force = gctl_get_paraml(req, "force", sizeof(*force)); 464 if (force == NULL) { 465 gctl_error(req, "No 'force' argument"); 466 return; 467 } 468 469 for (i = 0; i < *nargs; i++) { 470 snprintf(param, sizeof(param), "arg%d", i); 471 name = gctl_get_asciiparam(req, param); 472 if (name == NULL) { 473 gctl_error(req, "No 'arg%d' argument", i); 474 return; 475 } 476 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 477 name += strlen("/dev/"); 478 gp = g_nop_find_geom(mp, name); 479 if (gp == NULL) { 480 G_NOP_DEBUG(1, "Device %s is invalid.", name); 481 gctl_error(req, "Device %s is invalid.", name); 482 return; 483 } 484 error = g_nop_destroy(gp, *force); 485 if (error != 0) { 486 gctl_error(req, "Cannot destroy device %s (error=%d).", 487 gp->name, error); 488 return; 489 } 490 } 491 } 492 493 static void 494 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp) 495 { 496 struct g_nop_softc *sc; 497 struct g_provider *pp; 498 const char *name; 499 char param[16]; 500 int i, *nargs; 501 502 g_topology_assert(); 503 504 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 505 if (nargs == NULL) { 506 gctl_error(req, "No '%s' argument", "nargs"); 507 return; 508 } 509 if (*nargs <= 0) { 510 gctl_error(req, "Missing device(s)."); 511 return; 512 } 513 514 for (i = 0; i < *nargs; i++) { 515 snprintf(param, sizeof(param), "arg%d", i); 516 name = gctl_get_asciiparam(req, param); 517 if (name == NULL) { 518 gctl_error(req, "No 'arg%d' argument", i); 519 return; 520 } 521 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 522 name += strlen("/dev/"); 523 pp = g_provider_by_name(name); 524 if (pp == NULL || pp->geom->class != mp) { 525 G_NOP_DEBUG(1, "Provider %s is invalid.", name); 526 gctl_error(req, "Provider %s is invalid.", name); 527 return; 528 } 529 sc = pp->geom->softc; 530 sc->sc_reads = 0; 531 sc->sc_writes = 0; 532 sc->sc_readbytes = 0; 533 sc->sc_wrotebytes = 0; 534 } 535 } 536 537 static void 538 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb) 539 { 540 uint32_t *version; 541 542 g_topology_assert(); 543 544 version = gctl_get_paraml(req, "version", sizeof(*version)); 545 if (version == NULL) { 546 gctl_error(req, "No '%s' argument.", "version"); 547 return; 548 } 549 if (*version != G_NOP_VERSION) { 550 gctl_error(req, "Userland and kernel parts are out of sync."); 551 return; 552 } 553 554 if (strcmp(verb, "create") == 0) { 555 g_nop_ctl_create(req, mp); 556 return; 557 } else if (strcmp(verb, "configure") == 0) { 558 g_nop_ctl_configure(req, mp); 559 return; 560 } else if (strcmp(verb, "destroy") == 0) { 561 g_nop_ctl_destroy(req, mp); 562 return; 563 } else if (strcmp(verb, "reset") == 0) { 564 g_nop_ctl_reset(req, mp); 565 return; 566 } 567 568 gctl_error(req, "Unknown verb."); 569 } 570 571 static void 572 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 573 struct g_consumer *cp, struct g_provider *pp) 574 { 575 struct g_nop_softc *sc; 576 577 if (pp != NULL || cp != NULL) 578 return; 579 sc = gp->softc; 580 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent, 581 (intmax_t)sc->sc_offset); 582 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent, 583 sc->sc_rfailprob); 584 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent, 585 sc->sc_wfailprob); 586 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error); 587 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads); 588 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes); 589 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent, 590 sc->sc_readbytes); 591 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent, 592 sc->sc_wrotebytes); 593 } 594 595 DECLARE_GEOM_CLASS(g_nop_class, g_nop);
Cache object: 84a9092c190872df02545da0fe984c47
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]