Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/geom/gate/g_gate.c
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1 /*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * Copyright (c) 2009-2010 The FreeBSD Foundation 4 * All rights reserved. 5 * 6 * Portions of this software were developed by Pawel Jakub Dawidek 7 * under sponsorship from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/bio.h> 37 #include <sys/conf.h> 38 #include <sys/kernel.h> 39 #include <sys/kthread.h> 40 #include <sys/fcntl.h> 41 #include <sys/linker.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mutex.h> 45 #include <sys/proc.h> 46 #include <sys/limits.h> 47 #include <sys/queue.h> 48 #include <sys/sysctl.h> 49 #include <sys/signalvar.h> 50 #include <sys/time.h> 51 #include <machine/atomic.h> 52 53 #include <geom/geom.h> 54 #include <geom/gate/g_gate.h> 55 56 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 57 58 SYSCTL_DECL(_kern_geom); 59 static SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, 60 "GEOM_GATE configuration"); 61 static int g_gate_debug = 0; 62 TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug); 63 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 64 "Debug level"); 65 static u_int g_gate_maxunits = 256; 66 TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits); 67 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN, 68 &g_gate_maxunits, 0, "Maximum number of ggate devices"); 69 70 struct g_class g_gate_class = { 71 .name = G_GATE_CLASS_NAME, 72 .version = G_VERSION, 73 }; 74 75 static struct cdev *status_dev; 76 static d_ioctl_t g_gate_ioctl; 77 static struct cdevsw g_gate_cdevsw = { 78 .d_version = D_VERSION, 79 .d_ioctl = g_gate_ioctl, 80 .d_name = G_GATE_CTL_NAME 81 }; 82 83 84 static struct g_gate_softc **g_gate_units; 85 static u_int g_gate_nunits; 86 static struct mtx g_gate_units_lock; 87 88 static int 89 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 90 { 91 struct g_provider *pp; 92 struct g_consumer *cp; 93 struct g_geom *gp; 94 struct bio *bp; 95 96 g_topology_assert(); 97 mtx_assert(&g_gate_units_lock, MA_OWNED); 98 pp = sc->sc_provider; 99 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 100 mtx_unlock(&g_gate_units_lock); 101 return (EBUSY); 102 } 103 mtx_unlock(&g_gate_units_lock); 104 mtx_lock(&sc->sc_queue_mtx); 105 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 106 sc->sc_flags |= G_GATE_FLAG_DESTROY; 107 wakeup(sc); 108 mtx_unlock(&sc->sc_queue_mtx); 109 gp = pp->geom; 110 pp->flags |= G_PF_WITHER; 111 g_orphan_provider(pp, ENXIO); 112 callout_drain(&sc->sc_callout); 113 mtx_lock(&sc->sc_queue_mtx); 114 while ((bp = bioq_first(&sc->sc_inqueue)) != NULL) { 115 bioq_remove(&sc->sc_inqueue, bp); 116 sc->sc_queue_count--; 117 G_GATE_LOGREQ(1, bp, "Request canceled."); 118 g_io_deliver(bp, ENXIO); 119 } 120 while ((bp = bioq_first(&sc->sc_outqueue)) != NULL) { 121 bioq_remove(&sc->sc_outqueue, bp); 122 sc->sc_queue_count--; 123 G_GATE_LOGREQ(1, bp, "Request canceled."); 124 g_io_deliver(bp, ENXIO); 125 } 126 mtx_unlock(&sc->sc_queue_mtx); 127 g_topology_unlock(); 128 mtx_lock(&g_gate_units_lock); 129 /* One reference is ours. */ 130 sc->sc_ref--; 131 while (sc->sc_ref > 0) 132 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 133 g_gate_units[sc->sc_unit] = NULL; 134 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 135 g_gate_nunits--; 136 mtx_unlock(&g_gate_units_lock); 137 mtx_destroy(&sc->sc_queue_mtx); 138 g_topology_lock(); 139 if ((cp = sc->sc_readcons) != NULL) { 140 sc->sc_readcons = NULL; 141 (void)g_access(cp, -1, 0, 0); 142 g_detach(cp); 143 g_destroy_consumer(cp); 144 } 145 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name); 146 gp->softc = NULL; 147 g_wither_geom(gp, ENXIO); 148 sc->sc_provider = NULL; 149 free(sc, M_GATE); 150 return (0); 151 } 152 153 static int 154 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 155 { 156 struct g_gate_softc *sc; 157 158 if (dr <= 0 && dw <= 0 && de <= 0) 159 return (0); 160 sc = pp->geom->softc; 161 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 162 return (ENXIO); 163 /* XXX: Hack to allow read-only mounts. */ 164 #if 0 165 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 166 return (EPERM); 167 #endif 168 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 169 return (EPERM); 170 return (0); 171 } 172 173 static void 174 g_gate_queue_io(struct bio *bp) 175 { 176 struct g_gate_softc *sc; 177 178 sc = bp->bio_to->geom->softc; 179 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 180 g_io_deliver(bp, ENXIO); 181 return; 182 } 183 184 mtx_lock(&sc->sc_queue_mtx); 185 186 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 187 mtx_unlock(&sc->sc_queue_mtx); 188 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 189 g_io_deliver(bp, ENOMEM); 190 return; 191 } 192 193 bp->bio_driver1 = (void *)sc->sc_seq; 194 sc->sc_seq++; 195 sc->sc_queue_count++; 196 197 bioq_insert_tail(&sc->sc_inqueue, bp); 198 wakeup(sc); 199 200 mtx_unlock(&sc->sc_queue_mtx); 201 } 202 203 static void 204 g_gate_done(struct bio *cbp) 205 { 206 struct bio *pbp; 207 208 pbp = cbp->bio_parent; 209 if (cbp->bio_error == 0) { 210 pbp->bio_completed = cbp->bio_completed; 211 g_destroy_bio(cbp); 212 pbp->bio_inbed++; 213 g_io_deliver(pbp, 0); 214 } else { 215 /* If direct read failed, pass it through userland daemon. */ 216 g_destroy_bio(cbp); 217 pbp->bio_children--; 218 g_gate_queue_io(pbp); 219 } 220 } 221 222 static void 223 g_gate_start(struct bio *pbp) 224 { 225 struct g_gate_softc *sc; 226 227 sc = pbp->bio_to->geom->softc; 228 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 229 g_io_deliver(pbp, ENXIO); 230 return; 231 } 232 G_GATE_LOGREQ(2, pbp, "Request received."); 233 switch (pbp->bio_cmd) { 234 case BIO_READ: 235 if (sc->sc_readcons != NULL) { 236 struct bio *cbp; 237 238 cbp = g_clone_bio(pbp); 239 if (cbp == NULL) { 240 g_io_deliver(pbp, ENOMEM); 241 return; 242 } 243 cbp->bio_done = g_gate_done; 244 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset; 245 cbp->bio_to = sc->sc_readcons->provider; 246 g_io_request(cbp, sc->sc_readcons); 247 return; 248 } 249 break; 250 case BIO_DELETE: 251 case BIO_WRITE: 252 case BIO_FLUSH: 253 /* XXX: Hack to allow read-only mounts. */ 254 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 255 g_io_deliver(pbp, EPERM); 256 return; 257 } 258 break; 259 case BIO_GETATTR: 260 default: 261 G_GATE_LOGREQ(2, pbp, "Ignoring request."); 262 g_io_deliver(pbp, EOPNOTSUPP); 263 return; 264 } 265 266 g_gate_queue_io(pbp); 267 } 268 269 static struct g_gate_softc * 270 g_gate_hold(int unit, const char *name) 271 { 272 struct g_gate_softc *sc = NULL; 273 274 mtx_lock(&g_gate_units_lock); 275 if (unit >= 0 && unit < g_gate_maxunits) 276 sc = g_gate_units[unit]; 277 else if (unit == G_GATE_NAME_GIVEN) { 278 KASSERT(name != NULL, ("name is NULL")); 279 for (unit = 0; unit < g_gate_maxunits; unit++) { 280 if (g_gate_units[unit] == NULL) 281 continue; 282 if (strcmp(name, 283 g_gate_units[unit]->sc_provider->name) != 0) { 284 continue; 285 } 286 sc = g_gate_units[unit]; 287 break; 288 } 289 } 290 if (sc != NULL) 291 sc->sc_ref++; 292 mtx_unlock(&g_gate_units_lock); 293 return (sc); 294 } 295 296 static void 297 g_gate_release(struct g_gate_softc *sc) 298 { 299 300 g_topology_assert_not(); 301 mtx_lock(&g_gate_units_lock); 302 sc->sc_ref--; 303 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 304 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 305 wakeup(&sc->sc_ref); 306 mtx_unlock(&g_gate_units_lock); 307 } 308 309 static int 310 g_gate_getunit(int unit, int *errorp) 311 { 312 313 mtx_assert(&g_gate_units_lock, MA_OWNED); 314 if (unit >= 0) { 315 if (unit >= g_gate_maxunits) 316 *errorp = EINVAL; 317 else if (g_gate_units[unit] == NULL) 318 return (unit); 319 else 320 *errorp = EEXIST; 321 } else { 322 for (unit = 0; unit < g_gate_maxunits; unit++) { 323 if (g_gate_units[unit] == NULL) 324 return (unit); 325 } 326 *errorp = ENFILE; 327 } 328 return (-1); 329 } 330 331 static void 332 g_gate_guard(void *arg) 333 { 334 struct g_gate_softc *sc; 335 struct bintime curtime; 336 struct bio *bp, *bp2; 337 338 sc = arg; 339 binuptime(&curtime); 340 g_gate_hold(sc->sc_unit, NULL); 341 mtx_lock(&sc->sc_queue_mtx); 342 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 343 if (curtime.sec - bp->bio_t0.sec < 5) 344 continue; 345 bioq_remove(&sc->sc_inqueue, bp); 346 sc->sc_queue_count--; 347 G_GATE_LOGREQ(1, bp, "Request timeout."); 348 g_io_deliver(bp, EIO); 349 } 350 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 351 if (curtime.sec - bp->bio_t0.sec < 5) 352 continue; 353 bioq_remove(&sc->sc_outqueue, bp); 354 sc->sc_queue_count--; 355 G_GATE_LOGREQ(1, bp, "Request timeout."); 356 g_io_deliver(bp, EIO); 357 } 358 mtx_unlock(&sc->sc_queue_mtx); 359 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 360 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 361 g_gate_guard, sc); 362 } 363 g_gate_release(sc); 364 } 365 366 static void 367 g_gate_orphan(struct g_consumer *cp) 368 { 369 struct g_gate_softc *sc; 370 struct g_geom *gp; 371 372 g_topology_assert(); 373 gp = cp->geom; 374 sc = gp->softc; 375 if (sc == NULL) 376 return; 377 KASSERT(cp == sc->sc_readcons, ("cp=%p sc_readcons=%p", cp, 378 sc->sc_readcons)); 379 sc->sc_readcons = NULL; 380 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.", 381 cp->provider->name); 382 (void)g_access(cp, -1, 0, 0); 383 g_detach(cp); 384 g_destroy_consumer(cp); 385 } 386 387 static void 388 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 389 struct g_consumer *cp, struct g_provider *pp) 390 { 391 struct g_gate_softc *sc; 392 393 sc = gp->softc; 394 if (sc == NULL || pp != NULL || cp != NULL) 395 return; 396 sc = g_gate_hold(sc->sc_unit, NULL); 397 if (sc == NULL) 398 return; 399 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 400 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 401 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 402 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 403 "write-only"); 404 } else { 405 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 406 "read-write"); 407 } 408 if (sc->sc_readcons != NULL) { 409 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n", 410 indent, (intmax_t)sc->sc_readoffset); 411 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n", 412 indent, sc->sc_readcons->provider->name); 413 } 414 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 415 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 416 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 417 sc->sc_queue_count); 418 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 419 sc->sc_queue_size); 420 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 421 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 422 g_topology_unlock(); 423 g_gate_release(sc); 424 g_topology_lock(); 425 } 426 427 static int 428 g_gate_create(struct g_gate_ctl_create *ggio) 429 { 430 struct g_gate_softc *sc; 431 struct g_geom *gp; 432 struct g_provider *pp, *ropp; 433 struct g_consumer *cp; 434 char name[NAME_MAX]; 435 int error = 0, unit; 436 437 if (ggio->gctl_mediasize <= 0) { 438 G_GATE_DEBUG(1, "Invalid media size."); 439 return (EINVAL); 440 } 441 if (ggio->gctl_sectorsize <= 0) { 442 G_GATE_DEBUG(1, "Invalid sector size."); 443 return (EINVAL); 444 } 445 if (!powerof2(ggio->gctl_sectorsize)) { 446 G_GATE_DEBUG(1, "Invalid sector size."); 447 return (EINVAL); 448 } 449 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 450 G_GATE_DEBUG(1, "Invalid media size."); 451 return (EINVAL); 452 } 453 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 454 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 455 G_GATE_DEBUG(1, "Invalid flags."); 456 return (EINVAL); 457 } 458 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 459 ggio->gctl_unit != G_GATE_NAME_GIVEN && 460 ggio->gctl_unit < 0) { 461 G_GATE_DEBUG(1, "Invalid unit number."); 462 return (EINVAL); 463 } 464 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 465 ggio->gctl_name[0] == '\0') { 466 G_GATE_DEBUG(1, "No device name."); 467 return (EINVAL); 468 } 469 470 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 471 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 472 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 473 sc->sc_seq = 1; 474 bioq_init(&sc->sc_inqueue); 475 bioq_init(&sc->sc_outqueue); 476 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 477 sc->sc_queue_count = 0; 478 sc->sc_queue_size = ggio->gctl_maxcount; 479 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 480 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 481 sc->sc_timeout = ggio->gctl_timeout; 482 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 483 484 mtx_lock(&g_gate_units_lock); 485 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 486 if (sc->sc_unit < 0) 487 goto fail1; 488 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 489 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 490 else { 491 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 492 sc->sc_unit); 493 } 494 /* Check for name collision. */ 495 for (unit = 0; unit < g_gate_maxunits; unit++) { 496 if (g_gate_units[unit] == NULL) 497 continue; 498 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 499 continue; 500 error = EEXIST; 501 goto fail1; 502 } 503 sc->sc_name = name; 504 g_gate_units[sc->sc_unit] = sc; 505 g_gate_nunits++; 506 mtx_unlock(&g_gate_units_lock); 507 508 g_topology_lock(); 509 510 if (ggio->gctl_readprov[0] == '\0') { 511 ropp = NULL; 512 } else { 513 ropp = g_provider_by_name(ggio->gctl_readprov); 514 if (ropp == NULL) { 515 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 516 ggio->gctl_readprov); 517 error = EINVAL; 518 goto fail2; 519 } 520 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) { 521 G_GATE_DEBUG(1, "Invalid read offset."); 522 error = EINVAL; 523 goto fail2; 524 } 525 if (ggio->gctl_mediasize + ggio->gctl_readoffset > 526 ropp->mediasize) { 527 G_GATE_DEBUG(1, "Invalid read offset or media size."); 528 error = EINVAL; 529 goto fail2; 530 } 531 } 532 533 gp = g_new_geomf(&g_gate_class, "%s", name); 534 gp->start = g_gate_start; 535 gp->access = g_gate_access; 536 gp->orphan = g_gate_orphan; 537 gp->dumpconf = g_gate_dumpconf; 538 gp->softc = sc; 539 540 if (ropp != NULL) { 541 cp = g_new_consumer(gp); 542 error = g_attach(cp, ropp); 543 if (error != 0) { 544 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name); 545 goto fail3; 546 } 547 error = g_access(cp, 1, 0, 0); 548 if (error != 0) { 549 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name); 550 g_detach(cp); 551 goto fail3; 552 } 553 sc->sc_readcons = cp; 554 sc->sc_readoffset = ggio->gctl_readoffset; 555 } 556 557 ggio->gctl_unit = sc->sc_unit; 558 559 pp = g_new_providerf(gp, "%s", name); 560 pp->mediasize = ggio->gctl_mediasize; 561 pp->sectorsize = ggio->gctl_sectorsize; 562 sc->sc_provider = pp; 563 g_error_provider(pp, 0); 564 565 g_topology_unlock(); 566 mtx_lock(&g_gate_units_lock); 567 sc->sc_name = sc->sc_provider->name; 568 mtx_unlock(&g_gate_units_lock); 569 G_GATE_DEBUG(1, "Device %s created.", gp->name); 570 571 if (sc->sc_timeout > 0) { 572 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 573 g_gate_guard, sc); 574 } 575 return (0); 576 fail3: 577 g_destroy_consumer(cp); 578 g_destroy_geom(gp); 579 fail2: 580 g_topology_unlock(); 581 mtx_lock(&g_gate_units_lock); 582 g_gate_units[sc->sc_unit] = NULL; 583 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 584 g_gate_nunits--; 585 fail1: 586 mtx_unlock(&g_gate_units_lock); 587 mtx_destroy(&sc->sc_queue_mtx); 588 free(sc, M_GATE); 589 return (error); 590 } 591 592 static int 593 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio) 594 { 595 struct g_provider *pp; 596 struct g_consumer *cp; 597 int error; 598 599 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) { 600 if (ggio->gctl_mediasize <= 0) { 601 G_GATE_DEBUG(1, "Invalid media size."); 602 return (EINVAL); 603 } 604 pp = sc->sc_provider; 605 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) { 606 G_GATE_DEBUG(1, "Invalid media size."); 607 return (EINVAL); 608 } 609 /* TODO */ 610 return (EOPNOTSUPP); 611 } 612 613 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0) 614 (void)strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 615 616 cp = NULL; 617 618 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 619 g_topology_lock(); 620 if (sc->sc_readcons != NULL) { 621 cp = sc->sc_readcons; 622 sc->sc_readcons = NULL; 623 (void)g_access(cp, -1, 0, 0); 624 g_detach(cp); 625 g_destroy_consumer(cp); 626 } 627 if (ggio->gctl_readprov[0] != '\0') { 628 pp = g_provider_by_name(ggio->gctl_readprov); 629 if (pp == NULL) { 630 g_topology_unlock(); 631 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 632 ggio->gctl_readprov); 633 return (EINVAL); 634 } 635 cp = g_new_consumer(sc->sc_provider->geom); 636 error = g_attach(cp, pp); 637 if (error != 0) { 638 G_GATE_DEBUG(1, "Unable to attach to %s.", 639 pp->name); 640 } else { 641 error = g_access(cp, 1, 0, 0); 642 if (error != 0) { 643 G_GATE_DEBUG(1, "Unable to access %s.", 644 pp->name); 645 g_detach(cp); 646 } 647 } 648 if (error != 0) { 649 g_destroy_consumer(cp); 650 g_topology_unlock(); 651 return (error); 652 } 653 } 654 } else { 655 cp = sc->sc_readcons; 656 } 657 658 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) { 659 if (cp == NULL) { 660 G_GATE_DEBUG(1, "No read provider."); 661 return (EINVAL); 662 } 663 pp = sc->sc_provider; 664 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) { 665 G_GATE_DEBUG(1, "Invalid read offset."); 666 return (EINVAL); 667 } 668 if (pp->mediasize + ggio->gctl_readoffset > 669 cp->provider->mediasize) { 670 G_GATE_DEBUG(1, "Invalid read offset or media size."); 671 return (EINVAL); 672 } 673 sc->sc_readoffset = ggio->gctl_readoffset; 674 } 675 676 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 677 sc->sc_readcons = cp; 678 g_topology_unlock(); 679 } 680 681 return (0); 682 } 683 684 #define G_GATE_CHECK_VERSION(ggio) do { \ 685 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 686 printf("Version mismatch %d != %d.\n", \ 687 ggio->gctl_version, G_GATE_VERSION); \ 688 return (EINVAL); \ 689 } \ 690 } while (0) 691 static int 692 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 693 { 694 struct g_gate_softc *sc; 695 struct bio *bp; 696 int error = 0; 697 698 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 699 flags, td); 700 701 switch (cmd) { 702 case G_GATE_CMD_CREATE: 703 { 704 struct g_gate_ctl_create *ggio = (void *)addr; 705 706 G_GATE_CHECK_VERSION(ggio); 707 error = g_gate_create(ggio); 708 /* 709 * Reset TDP_GEOM flag. 710 * There are pending events for sure, because we just created 711 * new provider and other classes want to taste it, but we 712 * cannot answer on I/O requests until we're here. 713 */ 714 td->td_pflags &= ~TDP_GEOM; 715 return (error); 716 } 717 case G_GATE_CMD_MODIFY: 718 { 719 struct g_gate_ctl_modify *ggio = (void *)addr; 720 721 G_GATE_CHECK_VERSION(ggio); 722 sc = g_gate_hold(ggio->gctl_unit, NULL); 723 if (sc == NULL) 724 return (ENXIO); 725 error = g_gate_modify(sc, ggio); 726 g_gate_release(sc); 727 return (error); 728 } 729 case G_GATE_CMD_DESTROY: 730 { 731 struct g_gate_ctl_destroy *ggio = (void *)addr; 732 733 G_GATE_CHECK_VERSION(ggio); 734 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 735 if (sc == NULL) 736 return (ENXIO); 737 g_topology_lock(); 738 mtx_lock(&g_gate_units_lock); 739 error = g_gate_destroy(sc, ggio->gctl_force); 740 g_topology_unlock(); 741 if (error != 0) 742 g_gate_release(sc); 743 return (error); 744 } 745 case G_GATE_CMD_CANCEL: 746 { 747 struct g_gate_ctl_cancel *ggio = (void *)addr; 748 struct bio *tbp, *lbp; 749 750 G_GATE_CHECK_VERSION(ggio); 751 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 752 if (sc == NULL) 753 return (ENXIO); 754 lbp = NULL; 755 mtx_lock(&sc->sc_queue_mtx); 756 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 757 if (ggio->gctl_seq == 0 || 758 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 759 G_GATE_LOGREQ(1, bp, "Request canceled."); 760 bioq_remove(&sc->sc_outqueue, bp); 761 /* 762 * Be sure to put requests back onto incoming 763 * queue in the proper order. 764 */ 765 if (lbp == NULL) 766 bioq_insert_head(&sc->sc_inqueue, bp); 767 else { 768 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 769 lbp, bp, bio_queue); 770 } 771 lbp = bp; 772 /* 773 * If only one request was canceled, leave now. 774 */ 775 if (ggio->gctl_seq != 0) 776 break; 777 } 778 } 779 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 780 ggio->gctl_unit = sc->sc_unit; 781 mtx_unlock(&sc->sc_queue_mtx); 782 g_gate_release(sc); 783 return (error); 784 } 785 case G_GATE_CMD_START: 786 { 787 struct g_gate_ctl_io *ggio = (void *)addr; 788 789 G_GATE_CHECK_VERSION(ggio); 790 sc = g_gate_hold(ggio->gctl_unit, NULL); 791 if (sc == NULL) 792 return (ENXIO); 793 error = 0; 794 for (;;) { 795 mtx_lock(&sc->sc_queue_mtx); 796 bp = bioq_first(&sc->sc_inqueue); 797 if (bp != NULL) 798 break; 799 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 800 ggio->gctl_error = ECANCELED; 801 mtx_unlock(&sc->sc_queue_mtx); 802 goto start_end; 803 } 804 if (msleep(sc, &sc->sc_queue_mtx, 805 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 806 ggio->gctl_error = ECANCELED; 807 goto start_end; 808 } 809 } 810 ggio->gctl_cmd = bp->bio_cmd; 811 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 812 bp->bio_length > ggio->gctl_length) { 813 mtx_unlock(&sc->sc_queue_mtx); 814 ggio->gctl_length = bp->bio_length; 815 ggio->gctl_error = ENOMEM; 816 goto start_end; 817 } 818 bioq_remove(&sc->sc_inqueue, bp); 819 bioq_insert_tail(&sc->sc_outqueue, bp); 820 mtx_unlock(&sc->sc_queue_mtx); 821 822 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 823 ggio->gctl_offset = bp->bio_offset; 824 ggio->gctl_length = bp->bio_length; 825 826 switch (bp->bio_cmd) { 827 case BIO_READ: 828 case BIO_DELETE: 829 case BIO_FLUSH: 830 break; 831 case BIO_WRITE: 832 error = copyout(bp->bio_data, ggio->gctl_data, 833 bp->bio_length); 834 if (error != 0) { 835 mtx_lock(&sc->sc_queue_mtx); 836 bioq_remove(&sc->sc_outqueue, bp); 837 bioq_insert_head(&sc->sc_inqueue, bp); 838 mtx_unlock(&sc->sc_queue_mtx); 839 goto start_end; 840 } 841 break; 842 } 843 start_end: 844 g_gate_release(sc); 845 return (error); 846 } 847 case G_GATE_CMD_DONE: 848 { 849 struct g_gate_ctl_io *ggio = (void *)addr; 850 851 G_GATE_CHECK_VERSION(ggio); 852 sc = g_gate_hold(ggio->gctl_unit, NULL); 853 if (sc == NULL) 854 return (ENOENT); 855 error = 0; 856 mtx_lock(&sc->sc_queue_mtx); 857 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 858 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 859 break; 860 } 861 if (bp != NULL) { 862 bioq_remove(&sc->sc_outqueue, bp); 863 sc->sc_queue_count--; 864 } 865 mtx_unlock(&sc->sc_queue_mtx); 866 if (bp == NULL) { 867 /* 868 * Request was probably canceled. 869 */ 870 goto done_end; 871 } 872 if (ggio->gctl_error == EAGAIN) { 873 bp->bio_error = 0; 874 G_GATE_LOGREQ(1, bp, "Request desisted."); 875 mtx_lock(&sc->sc_queue_mtx); 876 sc->sc_queue_count++; 877 bioq_insert_head(&sc->sc_inqueue, bp); 878 wakeup(sc); 879 mtx_unlock(&sc->sc_queue_mtx); 880 } else { 881 bp->bio_error = ggio->gctl_error; 882 if (bp->bio_error == 0) { 883 bp->bio_completed = bp->bio_length; 884 switch (bp->bio_cmd) { 885 case BIO_READ: 886 error = copyin(ggio->gctl_data, 887 bp->bio_data, bp->bio_length); 888 if (error != 0) 889 bp->bio_error = error; 890 break; 891 case BIO_DELETE: 892 case BIO_WRITE: 893 case BIO_FLUSH: 894 break; 895 } 896 } 897 G_GATE_LOGREQ(2, bp, "Request done."); 898 g_io_deliver(bp, bp->bio_error); 899 } 900 done_end: 901 g_gate_release(sc); 902 return (error); 903 } 904 } 905 return (ENOIOCTL); 906 } 907 908 static void 909 g_gate_device(void) 910 { 911 912 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 913 G_GATE_CTL_NAME); 914 } 915 916 static int 917 g_gate_modevent(module_t mod, int type, void *data) 918 { 919 int error = 0; 920 921 switch (type) { 922 case MOD_LOAD: 923 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 924 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 925 M_GATE, M_WAITOK | M_ZERO); 926 g_gate_nunits = 0; 927 g_gate_device(); 928 break; 929 case MOD_UNLOAD: 930 mtx_lock(&g_gate_units_lock); 931 if (g_gate_nunits > 0) { 932 mtx_unlock(&g_gate_units_lock); 933 error = EBUSY; 934 break; 935 } 936 mtx_unlock(&g_gate_units_lock); 937 mtx_destroy(&g_gate_units_lock); 938 if (status_dev != 0) 939 destroy_dev(status_dev); 940 free(g_gate_units, M_GATE); 941 break; 942 default: 943 return (EOPNOTSUPP); 944 break; 945 } 946 947 return (error); 948 } 949 static moduledata_t g_gate_module = { 950 G_GATE_MOD_NAME, 951 g_gate_modevent, 952 NULL 953 }; 954 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 955 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
Cache object: 69d1124811258d232d97f92e1341b757
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