Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/gate/g_gate.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("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bio.h> 33 #include <sys/conf.h> 34 #include <sys/kernel.h> 35 #include <sys/kthread.h> 36 #include <sys/fcntl.h> 37 #include <sys/linker.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/mutex.h> 41 #include <sys/proc.h> 42 #include <sys/limits.h> 43 #include <sys/queue.h> 44 #include <sys/sysctl.h> 45 #include <sys/signalvar.h> 46 #include <sys/time.h> 47 #include <machine/atomic.h> 48 49 #include <geom/geom.h> 50 #include <geom/gate/g_gate.h> 51 52 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 53 54 SYSCTL_DECL(_kern_geom); 55 SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, "GEOM_GATE stuff"); 56 static u_int g_gate_debug = 0; 57 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 58 "Debug level"); 59 60 struct g_class g_gate_class = { 61 .name = G_GATE_CLASS_NAME, 62 .version = G_VERSION, 63 }; 64 65 static struct cdev *status_dev; 66 static d_ioctl_t g_gate_ioctl; 67 static struct cdevsw g_gate_cdevsw = { 68 .d_version = D_VERSION, 69 .d_ioctl = g_gate_ioctl, 70 .d_name = G_GATE_CTL_NAME 71 }; 72 73 74 static LIST_HEAD(, g_gate_softc) g_gate_list = 75 LIST_HEAD_INITIALIZER(&g_gate_list); 76 static struct mtx g_gate_list_mtx; 77 78 79 static int 80 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 81 { 82 struct g_provider *pp; 83 struct g_geom *gp; 84 struct bio *bp; 85 86 g_topology_assert(); 87 mtx_assert(&g_gate_list_mtx, MA_OWNED); 88 pp = sc->sc_provider; 89 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 90 mtx_unlock(&g_gate_list_mtx); 91 return (EBUSY); 92 } 93 mtx_unlock(&g_gate_list_mtx); 94 mtx_lock(&sc->sc_queue_mtx); 95 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 96 sc->sc_flags |= G_GATE_FLAG_DESTROY; 97 wakeup(sc); 98 mtx_unlock(&sc->sc_queue_mtx); 99 gp = pp->geom; 100 pp->flags |= G_PF_WITHER; 101 g_orphan_provider(pp, ENXIO); 102 callout_drain(&sc->sc_callout); 103 mtx_lock(&sc->sc_queue_mtx); 104 for (;;) { 105 bp = bioq_first(&sc->sc_inqueue); 106 if (bp != NULL) { 107 bioq_remove(&sc->sc_inqueue, bp); 108 sc->sc_queue_count--; 109 G_GATE_LOGREQ(1, bp, "Request canceled."); 110 g_io_deliver(bp, ENXIO); 111 } else { 112 break; 113 } 114 } 115 for (;;) { 116 bp = bioq_first(&sc->sc_outqueue); 117 if (bp != NULL) { 118 bioq_remove(&sc->sc_outqueue, bp); 119 sc->sc_queue_count--; 120 G_GATE_LOGREQ(1, bp, "Request canceled."); 121 g_io_deliver(bp, ENXIO); 122 } else { 123 break; 124 } 125 } 126 mtx_unlock(&sc->sc_queue_mtx); 127 g_topology_unlock(); 128 mtx_lock(&g_gate_list_mtx); 129 /* One reference is ours. */ 130 sc->sc_ref--; 131 while (sc->sc_ref > 0) { 132 msleep(&sc->sc_ref, &g_gate_list_mtx, 0, "gg:destroy", 0); 133 } 134 LIST_REMOVE(sc, sc_next); 135 mtx_unlock(&g_gate_list_mtx); 136 mtx_destroy(&sc->sc_queue_mtx); 137 g_topology_lock(); 138 G_GATE_DEBUG(0, "Device %s destroyed.", gp->name); 139 gp->softc = NULL; 140 g_wither_geom(gp, ENXIO); 141 sc->sc_provider = NULL; 142 free(sc, M_GATE); 143 return (0); 144 } 145 146 static int 147 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 148 { 149 struct g_gate_softc *sc; 150 151 if (dr <= 0 && dw <= 0 && de <= 0) 152 return (0); 153 sc = pp->geom->softc; 154 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 155 return (ENXIO); 156 /* XXX: Hack to allow read-only mounts. */ 157 #if 0 158 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 159 return (EPERM); 160 #endif 161 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 162 return (EPERM); 163 return (0); 164 } 165 166 static void 167 g_gate_start(struct bio *bp) 168 { 169 struct g_gate_softc *sc; 170 171 sc = bp->bio_to->geom->softc; 172 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 173 g_io_deliver(bp, ENXIO); 174 return; 175 } 176 G_GATE_LOGREQ(2, bp, "Request received."); 177 switch (bp->bio_cmd) { 178 case BIO_READ: 179 break; 180 case BIO_DELETE: 181 case BIO_WRITE: 182 /* XXX: Hack to allow read-only mounts. */ 183 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 184 g_io_deliver(bp, EPERM); 185 return; 186 } 187 break; 188 case BIO_GETATTR: 189 default: 190 G_GATE_LOGREQ(2, bp, "Ignoring request."); 191 g_io_deliver(bp, EOPNOTSUPP); 192 return; 193 } 194 195 mtx_lock(&sc->sc_queue_mtx); 196 if (sc->sc_queue_count > sc->sc_queue_size) { 197 mtx_unlock(&sc->sc_queue_mtx); 198 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 199 g_io_deliver(bp, EIO); 200 return; 201 } 202 203 bp->bio_driver1 = (void *)sc->sc_seq; 204 sc->sc_seq++; 205 sc->sc_queue_count++; 206 207 bioq_insert_tail(&sc->sc_inqueue, bp); 208 wakeup(sc); 209 210 mtx_unlock(&sc->sc_queue_mtx); 211 } 212 213 static struct g_gate_softc * 214 g_gate_hold(u_int unit) 215 { 216 struct g_gate_softc *sc; 217 218 mtx_lock(&g_gate_list_mtx); 219 LIST_FOREACH(sc, &g_gate_list, sc_next) { 220 if (sc->sc_unit == unit) 221 break; 222 } 223 if (sc != NULL) 224 sc->sc_ref++; 225 mtx_unlock(&g_gate_list_mtx); 226 return (sc); 227 } 228 229 static void 230 g_gate_release(struct g_gate_softc *sc) 231 { 232 233 g_topology_assert_not(); 234 mtx_lock(&g_gate_list_mtx); 235 sc->sc_ref--; 236 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 237 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 238 wakeup(&sc->sc_ref); 239 mtx_unlock(&g_gate_list_mtx); 240 } else { 241 mtx_unlock(&g_gate_list_mtx); 242 } 243 } 244 245 static int 246 g_gate_getunit(int unit) 247 { 248 struct g_gate_softc *sc; 249 250 mtx_assert(&g_gate_list_mtx, MA_OWNED); 251 if (unit >= 0) { 252 LIST_FOREACH(sc, &g_gate_list, sc_next) { 253 if (sc->sc_unit == unit) 254 return (-1); 255 } 256 } else { 257 unit = 0; 258 once_again: 259 LIST_FOREACH(sc, &g_gate_list, sc_next) { 260 if (sc->sc_unit == unit) { 261 if (++unit > 666) 262 return (-1); 263 goto once_again; 264 } 265 } 266 } 267 return (unit); 268 } 269 270 static void 271 g_gate_guard(void *arg) 272 { 273 struct g_gate_softc *sc; 274 struct bintime curtime; 275 struct bio *bp, *bp2; 276 277 sc = arg; 278 binuptime(&curtime); 279 g_gate_hold(sc->sc_unit); 280 mtx_lock(&sc->sc_queue_mtx); 281 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 282 if (curtime.sec - bp->bio_t0.sec < 5) 283 continue; 284 bioq_remove(&sc->sc_inqueue, bp); 285 sc->sc_queue_count--; 286 G_GATE_LOGREQ(1, bp, "Request timeout."); 287 g_io_deliver(bp, EIO); 288 } 289 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 290 if (curtime.sec - bp->bio_t0.sec < 5) 291 continue; 292 bioq_remove(&sc->sc_outqueue, bp); 293 sc->sc_queue_count--; 294 G_GATE_LOGREQ(1, bp, "Request timeout."); 295 g_io_deliver(bp, EIO); 296 } 297 mtx_unlock(&sc->sc_queue_mtx); 298 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 299 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 300 g_gate_guard, sc); 301 } 302 g_gate_release(sc); 303 } 304 305 static void 306 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 307 struct g_consumer *cp, struct g_provider *pp) 308 { 309 struct g_gate_softc *sc; 310 311 sc = gp->softc; 312 if (sc == NULL || pp != NULL || cp != NULL) 313 return; 314 g_gate_hold(sc->sc_unit); 315 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 316 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 317 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 318 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 319 "write-only"); 320 } else { 321 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 322 "read-write"); 323 } 324 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 325 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 326 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 327 sc->sc_queue_count); 328 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 329 sc->sc_queue_size); 330 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 331 g_topology_unlock(); 332 g_gate_release(sc); 333 g_topology_lock(); 334 } 335 336 static int 337 g_gate_create(struct g_gate_ctl_create *ggio) 338 { 339 struct g_gate_softc *sc; 340 struct g_geom *gp; 341 struct g_provider *pp; 342 343 if (ggio->gctl_mediasize == 0) { 344 G_GATE_DEBUG(1, "Invalid media size."); 345 return (EINVAL); 346 } 347 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 348 G_GATE_DEBUG(1, "Invalid sector size."); 349 return (EINVAL); 350 } 351 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 352 G_GATE_DEBUG(1, "Invalid media size."); 353 return (EINVAL); 354 } 355 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 356 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 357 G_GATE_DEBUG(1, "Invalid flags."); 358 return (EINVAL); 359 } 360 if (ggio->gctl_unit < -1) { 361 G_GATE_DEBUG(1, "Invalid unit number."); 362 return (EINVAL); 363 } 364 365 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 366 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 367 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 368 sc->sc_seq = 0; 369 bioq_init(&sc->sc_inqueue); 370 bioq_init(&sc->sc_outqueue); 371 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 372 sc->sc_queue_count = 0; 373 sc->sc_queue_size = ggio->gctl_maxcount; 374 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 375 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 376 sc->sc_timeout = ggio->gctl_timeout; 377 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 378 mtx_lock(&g_gate_list_mtx); 379 ggio->gctl_unit = g_gate_getunit(ggio->gctl_unit); 380 if (ggio->gctl_unit == -1) { 381 mtx_unlock(&g_gate_list_mtx); 382 mtx_destroy(&sc->sc_queue_mtx); 383 free(sc, M_GATE); 384 return (EBUSY); 385 } 386 sc->sc_unit = ggio->gctl_unit; 387 LIST_INSERT_HEAD(&g_gate_list, sc, sc_next); 388 mtx_unlock(&g_gate_list_mtx); 389 390 g_topology_lock(); 391 gp = g_new_geomf(&g_gate_class, "%s%d", G_GATE_PROVIDER_NAME, 392 sc->sc_unit); 393 gp->start = g_gate_start; 394 gp->access = g_gate_access; 395 gp->dumpconf = g_gate_dumpconf; 396 gp->softc = sc; 397 pp = g_new_providerf(gp, "%s%d", G_GATE_PROVIDER_NAME, sc->sc_unit); 398 pp->mediasize = ggio->gctl_mediasize; 399 pp->sectorsize = ggio->gctl_sectorsize; 400 sc->sc_provider = pp; 401 g_error_provider(pp, 0); 402 g_topology_unlock(); 403 404 if (sc->sc_timeout > 0) { 405 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 406 g_gate_guard, sc); 407 } 408 return (0); 409 } 410 411 #define G_GATE_CHECK_VERSION(ggio) do { \ 412 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 413 printf("Version mismatch %d != %d.\n", \ 414 ggio->gctl_version, G_GATE_VERSION); \ 415 return (EINVAL); \ 416 } \ 417 } while (0) 418 static int 419 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 420 { 421 struct g_gate_softc *sc; 422 struct bio *bp; 423 int error = 0; 424 425 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 426 flags, td); 427 428 switch (cmd) { 429 case G_GATE_CMD_CREATE: 430 { 431 struct g_gate_ctl_create *ggio = (void *)addr; 432 433 G_GATE_CHECK_VERSION(ggio); 434 error = g_gate_create(ggio); 435 /* 436 * Reset TDP_GEOM flag. 437 * There are pending events for sure, because we just created 438 * new provider and other classes want to taste it, but we 439 * cannot answer on I/O requests until we're here. 440 */ 441 td->td_pflags &= ~TDP_GEOM; 442 return (error); 443 } 444 case G_GATE_CMD_DESTROY: 445 { 446 struct g_gate_ctl_destroy *ggio = (void *)addr; 447 448 G_GATE_CHECK_VERSION(ggio); 449 sc = g_gate_hold(ggio->gctl_unit); 450 if (sc == NULL) 451 return (ENXIO); 452 g_topology_lock(); 453 mtx_lock(&g_gate_list_mtx); 454 error = g_gate_destroy(sc, ggio->gctl_force); 455 g_topology_unlock(); 456 if (error != 0) 457 g_gate_release(sc); 458 return (error); 459 } 460 case G_GATE_CMD_CANCEL: 461 { 462 struct g_gate_ctl_cancel *ggio = (void *)addr; 463 struct bio *tbp, *lbp; 464 465 G_GATE_CHECK_VERSION(ggio); 466 sc = g_gate_hold(ggio->gctl_unit); 467 if (sc == NULL) 468 return (ENXIO); 469 lbp = NULL; 470 mtx_lock(&sc->sc_queue_mtx); 471 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 472 if (ggio->gctl_seq == 0 || 473 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 474 G_GATE_LOGREQ(1, bp, "Request canceled."); 475 bioq_remove(&sc->sc_outqueue, bp); 476 /* 477 * Be sure to put requests back onto incoming 478 * queue in the proper order. 479 */ 480 if (lbp == NULL) 481 bioq_insert_head(&sc->sc_inqueue, bp); 482 else { 483 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 484 lbp, bp, bio_queue); 485 } 486 lbp = bp; 487 /* 488 * If only one request was canceled, leave now. 489 */ 490 if (ggio->gctl_seq != 0) 491 break; 492 } 493 } 494 mtx_unlock(&sc->sc_queue_mtx); 495 g_gate_release(sc); 496 return (error); 497 } 498 case G_GATE_CMD_START: 499 { 500 struct g_gate_ctl_io *ggio = (void *)addr; 501 502 G_GATE_CHECK_VERSION(ggio); 503 sc = g_gate_hold(ggio->gctl_unit); 504 if (sc == NULL) 505 return (ENXIO); 506 error = 0; 507 for (;;) { 508 mtx_lock(&sc->sc_queue_mtx); 509 bp = bioq_first(&sc->sc_inqueue); 510 if (bp != NULL) 511 break; 512 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 513 ggio->gctl_error = ECANCELED; 514 mtx_unlock(&sc->sc_queue_mtx); 515 goto start_end; 516 } 517 if (msleep(sc, &sc->sc_queue_mtx, 518 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 519 ggio->gctl_error = ECANCELED; 520 goto start_end; 521 } 522 } 523 ggio->gctl_cmd = bp->bio_cmd; 524 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 525 bp->bio_length > ggio->gctl_length) { 526 mtx_unlock(&sc->sc_queue_mtx); 527 ggio->gctl_length = bp->bio_length; 528 ggio->gctl_error = ENOMEM; 529 goto start_end; 530 } 531 bioq_remove(&sc->sc_inqueue, bp); 532 bioq_insert_tail(&sc->sc_outqueue, bp); 533 mtx_unlock(&sc->sc_queue_mtx); 534 535 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 536 ggio->gctl_offset = bp->bio_offset; 537 ggio->gctl_length = bp->bio_length; 538 539 switch (bp->bio_cmd) { 540 case BIO_READ: 541 break; 542 case BIO_DELETE: 543 case BIO_WRITE: 544 error = copyout(bp->bio_data, ggio->gctl_data, 545 bp->bio_length); 546 if (error != 0) { 547 mtx_lock(&sc->sc_queue_mtx); 548 bioq_remove(&sc->sc_outqueue, bp); 549 bioq_insert_head(&sc->sc_inqueue, bp); 550 mtx_unlock(&sc->sc_queue_mtx); 551 goto start_end; 552 } 553 break; 554 } 555 start_end: 556 g_gate_release(sc); 557 return (error); 558 } 559 case G_GATE_CMD_DONE: 560 { 561 struct g_gate_ctl_io *ggio = (void *)addr; 562 563 G_GATE_CHECK_VERSION(ggio); 564 sc = g_gate_hold(ggio->gctl_unit); 565 if (sc == NULL) 566 return (ENOENT); 567 error = 0; 568 mtx_lock(&sc->sc_queue_mtx); 569 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 570 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 571 break; 572 } 573 if (bp != NULL) { 574 bioq_remove(&sc->sc_outqueue, bp); 575 sc->sc_queue_count--; 576 } 577 mtx_unlock(&sc->sc_queue_mtx); 578 if (bp == NULL) { 579 /* 580 * Request was probably canceled. 581 */ 582 goto done_end; 583 } 584 if (ggio->gctl_error == EAGAIN) { 585 bp->bio_error = 0; 586 G_GATE_LOGREQ(1, bp, "Request desisted."); 587 mtx_lock(&sc->sc_queue_mtx); 588 sc->sc_queue_count++; 589 bioq_insert_head(&sc->sc_inqueue, bp); 590 wakeup(sc); 591 mtx_unlock(&sc->sc_queue_mtx); 592 } else { 593 bp->bio_error = ggio->gctl_error; 594 if (bp->bio_error == 0) { 595 bp->bio_completed = bp->bio_length; 596 switch (bp->bio_cmd) { 597 case BIO_READ: 598 error = copyin(ggio->gctl_data, 599 bp->bio_data, bp->bio_length); 600 if (error != 0) 601 bp->bio_error = error; 602 break; 603 case BIO_DELETE: 604 case BIO_WRITE: 605 break; 606 } 607 } 608 G_GATE_LOGREQ(2, bp, "Request done."); 609 g_io_deliver(bp, bp->bio_error); 610 } 611 done_end: 612 g_gate_release(sc); 613 return (error); 614 } 615 } 616 return (ENOIOCTL); 617 } 618 619 static void 620 g_gate_device(void) 621 { 622 623 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 624 G_GATE_CTL_NAME); 625 } 626 627 static int 628 g_gate_modevent(module_t mod, int type, void *data) 629 { 630 int error = 0; 631 632 switch (type) { 633 case MOD_LOAD: 634 mtx_init(&g_gate_list_mtx, "gg_list_lock", NULL, MTX_DEF); 635 g_gate_device(); 636 break; 637 case MOD_UNLOAD: 638 mtx_lock(&g_gate_list_mtx); 639 if (!LIST_EMPTY(&g_gate_list)) { 640 mtx_unlock(&g_gate_list_mtx); 641 error = EBUSY; 642 break; 643 } 644 mtx_unlock(&g_gate_list_mtx); 645 mtx_destroy(&g_gate_list_mtx); 646 if (status_dev != 0) 647 destroy_dev(status_dev); 648 break; 649 default: 650 return (EOPNOTSUPP); 651 break; 652 } 653 654 return (error); 655 } 656 static moduledata_t g_gate_module = { 657 G_GATE_MOD_NAME, 658 g_gate_modevent, 659 NULL 660 }; 661 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 662 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
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