1 /*- 2 * Copyright (c) 2004 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 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bio.h> 32 #include <sys/conf.h> 33 #include <sys/kernel.h> 34 #include <sys/kthread.h> 35 #include <sys/fcntl.h> 36 #include <sys/linker.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/limits.h> 42 #include <sys/queue.h> 43 #include <sys/sysctl.h> 44 #include <sys/signalvar.h> 45 #include <sys/time.h> 46 #include <machine/atomic.h> 47 48 #include <geom/geom.h> 49 #include <geom/gate/g_gate.h> 50 51 static MALLOC_DEFINE(M_GATE, "gg data", "GEOM Gate Data"); 52 53 SYSCTL_DECL(_kern_geom); 54 SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, "GEOM_GATE stuff"); 55 static u_int g_gate_debug = 0; 56 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 57 "Debug level"); 58 59 static int g_gate_destroy_geom(struct gctl_req *, struct g_class *, 60 struct g_geom *); 61 struct g_class g_gate_class = { 62 .name = G_GATE_CLASS_NAME, 63 .destroy_geom = g_gate_destroy_geom 64 }; 65 66 static dev_t status_dev; 67 static d_ioctl_t g_gate_ioctl; 68 static struct cdevsw g_gate_cdevsw = { 69 .d_version = D_VERSION, 70 .d_ioctl = g_gate_ioctl, 71 .d_name = G_GATE_CTL_NAME 72 }; 73 74 75 static LIST_HEAD(, g_gate_softc) g_gate_list = 76 LIST_HEAD_INITIALIZER(&g_gate_list); 77 static struct mtx g_gate_list_mtx; 78 79 80 static void 81 g_gate_wither(struct g_gate_softc *sc) 82 { 83 84 atomic_set_32(&sc->sc_flags, G_GATE_FLAG_DESTROY); 85 } 86 87 static int 88 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 89 { 90 struct g_provider *pp; 91 struct bio *bp; 92 93 g_topology_assert(); 94 mtx_assert(&g_gate_list_mtx, MA_OWNED); 95 pp = sc->sc_provider; 96 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 97 mtx_unlock(&g_gate_list_mtx); 98 return (EBUSY); 99 } 100 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 101 g_gate_wither(sc); 102 LIST_REMOVE(sc, sc_next); 103 } 104 mtx_unlock(&g_gate_list_mtx); 105 mtx_lock(&sc->sc_inqueue_mtx); 106 wakeup(sc); 107 mtx_unlock(&sc->sc_inqueue_mtx); 108 if (sc->sc_ref > 0) { 109 G_GATE_DEBUG(1, "Cannot destroy %s yet.", sc->sc_name); 110 return (0); 111 } 112 callout_drain(&sc->sc_callout); 113 mtx_lock(&sc->sc_inqueue_mtx); 114 for (;;) { 115 bp = bioq_first(&sc->sc_inqueue); 116 if (bp != NULL) { 117 bioq_remove(&sc->sc_inqueue, bp); 118 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 119 G_GATE_LOGREQ(1, bp, "Request canceled."); 120 g_io_deliver(bp, ENXIO); 121 } else { 122 break; 123 } 124 } 125 mtx_destroy(&sc->sc_inqueue_mtx); 126 mtx_lock(&sc->sc_outqueue_mtx); 127 for (;;) { 128 bp = bioq_first(&sc->sc_outqueue); 129 if (bp != NULL) { 130 bioq_remove(&sc->sc_outqueue, bp); 131 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 132 G_GATE_LOGREQ(1, bp, "Request canceled."); 133 g_io_deliver(bp, ENXIO); 134 } else { 135 break; 136 } 137 } 138 mtx_destroy(&sc->sc_outqueue_mtx); 139 G_GATE_DEBUG(0, "Device %s destroyed.", sc->sc_name); 140 pp->geom->softc = NULL; 141 g_wither_geom(pp->geom, ENXIO); 142 sc->sc_provider = NULL; 143 free(sc, M_GATE); 144 return (0); 145 } 146 147 static void 148 g_gate_destroy_it(void *arg, int flag __unused) 149 { 150 struct g_gate_softc *sc; 151 152 g_topology_assert(); 153 sc = arg; 154 mtx_lock(&g_gate_list_mtx); 155 g_gate_destroy(sc, 1); 156 } 157 158 static int 159 g_gate_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 160 { 161 162 g_topology_assert(); 163 mtx_lock(&g_gate_list_mtx); 164 return (g_gate_destroy(gp->softc, 0)); 165 } 166 167 static int 168 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 169 { 170 struct g_gate_softc *sc; 171 172 if (dr <= 0 && dw <= 0 && de <= 0) 173 return (0); 174 sc = pp->geom->softc; 175 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 176 return (ENXIO); 177 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 178 return (EPERM); 179 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 180 return (EPERM); 181 return (0); 182 } 183 184 static void 185 g_gate_start(struct bio *bp) 186 { 187 struct g_gate_softc *sc; 188 uint32_t qcount; 189 190 sc = bp->bio_to->geom->softc; 191 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 192 g_io_deliver(bp, ENXIO); 193 return; 194 } 195 G_GATE_LOGREQ(2, bp, "Request received."); 196 switch (bp->bio_cmd) { 197 case BIO_READ: 198 case BIO_DELETE: 199 case BIO_WRITE: 200 break; 201 case BIO_GETATTR: 202 default: 203 G_GATE_LOGREQ(2, bp, "Ignoring request."); 204 g_io_deliver(bp, EOPNOTSUPP); 205 return; 206 } 207 208 atomic_store_rel_32(&qcount, sc->sc_queue_count); 209 if (qcount > sc->sc_queue_size) { 210 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 211 g_io_deliver(bp, EIO); 212 return; 213 } 214 atomic_add_acq_32(&sc->sc_queue_count, 1); 215 bp->bio_driver1 = (void *)sc->sc_seq; 216 sc->sc_seq++; 217 218 mtx_lock(&sc->sc_inqueue_mtx); 219 bioq_disksort(&sc->sc_inqueue, bp); 220 wakeup(sc); 221 mtx_unlock(&sc->sc_inqueue_mtx); 222 } 223 224 static struct g_gate_softc * 225 g_gate_find(u_int unit) 226 { 227 struct g_gate_softc *sc; 228 229 mtx_assert(&g_gate_list_mtx, MA_OWNED); 230 LIST_FOREACH(sc, &g_gate_list, sc_next) { 231 if (sc->sc_unit == unit) 232 break; 233 } 234 return (sc); 235 } 236 237 static struct g_gate_softc * 238 g_gate_hold(u_int unit) 239 { 240 struct g_gate_softc *sc; 241 242 mtx_lock(&g_gate_list_mtx); 243 sc = g_gate_find(unit); 244 if (sc != NULL) { 245 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 246 sc = NULL; 247 else 248 sc->sc_ref++; 249 } 250 mtx_unlock(&g_gate_list_mtx); 251 return (sc); 252 } 253 254 static void 255 g_gate_release(struct g_gate_softc *sc) 256 { 257 258 g_topology_assert_not(); 259 mtx_lock(&g_gate_list_mtx); 260 sc->sc_ref--; 261 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 262 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 263 mtx_unlock(&g_gate_list_mtx); 264 g_waitfor_event(g_gate_destroy_it, sc, M_WAITOK, NULL); 265 } else { 266 mtx_unlock(&g_gate_list_mtx); 267 } 268 } 269 270 static int 271 g_gate_getunit(int unit) 272 { 273 struct g_gate_softc *sc; 274 275 mtx_assert(&g_gate_list_mtx, MA_OWNED); 276 if (unit >= 0) { 277 LIST_FOREACH(sc, &g_gate_list, sc_next) { 278 if (sc->sc_unit == unit) 279 return (-1); 280 } 281 } else { 282 unit = 0; 283 once_again: 284 LIST_FOREACH(sc, &g_gate_list, sc_next) { 285 if (sc->sc_unit == unit) { 286 if (++unit > 666) 287 return (-1); 288 goto once_again; 289 } 290 } 291 } 292 return (unit); 293 } 294 295 static void 296 g_gate_guard(void *arg) 297 { 298 struct g_gate_softc *sc; 299 struct bintime curtime; 300 struct bio *bp, *bp2; 301 302 sc = arg; 303 binuptime(&curtime); 304 g_gate_hold(sc->sc_unit); 305 mtx_lock(&sc->sc_inqueue_mtx); 306 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 307 if (curtime.sec - bp->bio_t0.sec < 5) 308 continue; 309 bioq_remove(&sc->sc_inqueue, bp); 310 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 311 G_GATE_LOGREQ(1, bp, "Request timeout."); 312 g_io_deliver(bp, EIO); 313 } 314 mtx_unlock(&sc->sc_inqueue_mtx); 315 mtx_lock(&sc->sc_outqueue_mtx); 316 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 317 if (curtime.sec - bp->bio_t0.sec < 5) 318 continue; 319 bioq_remove(&sc->sc_outqueue, bp); 320 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 321 G_GATE_LOGREQ(1, bp, "Request timeout."); 322 g_io_deliver(bp, EIO); 323 } 324 mtx_unlock(&sc->sc_outqueue_mtx); 325 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 326 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 327 g_gate_guard, sc); 328 } 329 g_gate_release(sc); 330 } 331 332 static void 333 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 334 struct g_consumer *cp, struct g_provider *pp) 335 { 336 struct g_gate_softc *sc; 337 338 sc = gp->softc; 339 if (sc == NULL || pp != NULL || cp != NULL) 340 return; 341 g_gate_hold(sc->sc_unit); 342 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 343 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 344 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 345 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 346 "write-only"); 347 } else { 348 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 349 "read-write"); 350 } 351 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 352 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 353 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 354 sc->sc_queue_count); 355 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 356 sc->sc_queue_size); 357 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 358 g_gate_release(sc); 359 } 360 361 static int 362 g_gate_create(struct g_gate_ctl_create *ggio) 363 { 364 struct g_gate_softc *sc; 365 struct g_geom *gp; 366 struct g_provider *pp; 367 368 if (ggio->gctl_mediasize == 0) { 369 G_GATE_DEBUG(1, "Invalid media size."); 370 return (EINVAL); 371 } 372 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 373 G_GATE_DEBUG(1, "Invalid sector size."); 374 return (EINVAL); 375 } 376 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 377 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 378 G_GATE_DEBUG(1, "Invalid flags."); 379 return (EINVAL); 380 } 381 if (ggio->gctl_unit < -1) { 382 G_GATE_DEBUG(1, "Invalid unit number."); 383 return (EINVAL); 384 } 385 386 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 387 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 388 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 389 sc->sc_seq = 0; 390 bioq_init(&sc->sc_inqueue); 391 mtx_init(&sc->sc_inqueue_mtx, "gg:inqueue", NULL, MTX_DEF); 392 bioq_init(&sc->sc_outqueue); 393 mtx_init(&sc->sc_outqueue_mtx, "gg:outqueue", NULL, MTX_DEF); 394 sc->sc_queue_count = 0; 395 sc->sc_queue_size = ggio->gctl_maxcount; 396 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 397 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 398 sc->sc_timeout = ggio->gctl_timeout; 399 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 400 mtx_lock(&g_gate_list_mtx); 401 ggio->gctl_unit = g_gate_getunit(ggio->gctl_unit); 402 if (ggio->gctl_unit == -1) { 403 mtx_destroy(&sc->sc_inqueue_mtx); 404 mtx_destroy(&sc->sc_outqueue_mtx); 405 free(sc, M_GATE); 406 return (EBUSY); 407 } 408 sc->sc_unit = ggio->gctl_unit; 409 LIST_INSERT_HEAD(&g_gate_list, sc, sc_next); 410 mtx_unlock(&g_gate_list_mtx); 411 412 DROP_GIANT(); 413 g_topology_lock(); 414 gp = g_new_geomf(&g_gate_class, "%s%d", G_GATE_PROVIDER_NAME, 415 sc->sc_unit); 416 gp->start = g_gate_start; 417 gp->access = g_gate_access; 418 gp->dumpconf = g_gate_dumpconf; 419 gp->softc = sc; 420 pp = g_new_providerf(gp, "%s%d", G_GATE_PROVIDER_NAME, sc->sc_unit); 421 pp->mediasize = ggio->gctl_mediasize; 422 pp->sectorsize = ggio->gctl_sectorsize; 423 sc->sc_provider = pp; 424 g_error_provider(pp, 0); 425 g_topology_unlock(); 426 PICKUP_GIANT(); 427 428 if (sc->sc_timeout > 0) { 429 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 430 g_gate_guard, sc); 431 } 432 return (0); 433 } 434 435 #define G_GATE_CHECK_VERSION(ggio) do { \ 436 if ((ggio)->gctl_version != G_GATE_VERSION) \ 437 return (EINVAL); \ 438 } while (0) 439 static int 440 g_gate_ioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 441 { 442 struct g_gate_softc *sc; 443 struct bio *bp; 444 int error = 0; 445 446 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 447 flags, td); 448 449 switch (cmd) { 450 case G_GATE_CMD_CREATE: 451 { 452 struct g_gate_ctl_create *ggio = (void *)addr; 453 454 G_GATE_CHECK_VERSION(ggio); 455 return (g_gate_create(ggio)); 456 } 457 case G_GATE_CMD_DESTROY: 458 { 459 struct g_gate_ctl_destroy *ggio = (void *)addr; 460 461 G_GATE_CHECK_VERSION(ggio); 462 sc = g_gate_hold(ggio->gctl_unit); 463 if (sc == NULL) 464 return (ENXIO); 465 g_topology_lock(); 466 mtx_lock(&g_gate_list_mtx); 467 error = g_gate_destroy(sc, ggio->gctl_force); 468 if (error == 0) 469 g_gate_wither(sc); 470 g_topology_unlock(); 471 g_gate_release(sc); 472 return (error); 473 } 474 case G_GATE_CMD_START: 475 { 476 struct g_gate_ctl_io *ggio = (void *)addr; 477 478 G_GATE_CHECK_VERSION(ggio); 479 sc = g_gate_hold(ggio->gctl_unit); 480 if (sc == NULL) 481 return (ENXIO); 482 for (;;) { 483 mtx_lock(&sc->sc_inqueue_mtx); 484 bp = bioq_first(&sc->sc_inqueue); 485 if (bp != NULL) 486 break; 487 if (msleep(sc, &sc->sc_inqueue_mtx, 488 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 489 g_gate_release(sc); 490 ggio->gctl_error = ECANCELED; 491 return (0); 492 } 493 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 494 g_gate_release(sc); 495 ggio->gctl_error = ECANCELED; 496 return (0); 497 } 498 } 499 ggio->gctl_cmd = bp->bio_cmd; 500 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 501 bp->bio_length > ggio->gctl_length) { 502 mtx_unlock(&sc->sc_inqueue_mtx); 503 g_gate_release(sc); 504 ggio->gctl_length = bp->bio_length; 505 ggio->gctl_error = ENOMEM; 506 return (0); 507 } 508 bioq_remove(&sc->sc_inqueue, bp); 509 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 510 mtx_unlock(&sc->sc_inqueue_mtx); 511 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 512 ggio->gctl_offset = bp->bio_offset; 513 ggio->gctl_length = bp->bio_length; 514 switch (bp->bio_cmd) { 515 case BIO_READ: 516 break; 517 case BIO_DELETE: 518 case BIO_WRITE: 519 error = copyout(bp->bio_data, ggio->gctl_data, 520 bp->bio_length); 521 if (error != 0) { 522 mtx_lock(&sc->sc_inqueue_mtx); 523 bioq_disksort(&sc->sc_inqueue, bp); 524 mtx_unlock(&sc->sc_inqueue_mtx); 525 g_gate_release(sc); 526 return (error); 527 } 528 break; 529 } 530 mtx_lock(&sc->sc_outqueue_mtx); 531 bioq_insert_tail(&sc->sc_outqueue, bp); 532 atomic_add_acq_32(&sc->sc_queue_count, 1); 533 mtx_unlock(&sc->sc_outqueue_mtx); 534 g_gate_release(sc); 535 return (0); 536 } 537 case G_GATE_CMD_DONE: 538 { 539 struct g_gate_ctl_io *ggio = (void *)addr; 540 541 G_GATE_CHECK_VERSION(ggio); 542 sc = g_gate_hold(ggio->gctl_unit); 543 if (sc == NULL) 544 return (ENOENT); 545 mtx_lock(&sc->sc_outqueue_mtx); 546 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 547 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 548 break; 549 } 550 if (bp != NULL) { 551 bioq_remove(&sc->sc_outqueue, bp); 552 atomic_subtract_rel_32(&sc->sc_queue_count, 1); 553 } 554 mtx_unlock(&sc->sc_outqueue_mtx); 555 if (bp == NULL) { 556 /* 557 * Request was probably canceled. 558 */ 559 g_gate_release(sc); 560 return (0); 561 } 562 if (ggio->gctl_error == EAGAIN) { 563 bp->bio_error = 0; 564 G_GATE_LOGREQ(1, bp, "Request desisted."); 565 atomic_add_acq_32(&sc->sc_queue_count, 1); 566 mtx_lock(&sc->sc_inqueue_mtx); 567 bioq_disksort(&sc->sc_inqueue, bp); 568 wakeup(sc); 569 mtx_unlock(&sc->sc_inqueue_mtx); 570 } else { 571 bp->bio_error = ggio->gctl_error; 572 if (bp->bio_error == 0) { 573 bp->bio_completed = bp->bio_length; 574 switch (bp->bio_cmd) { 575 case BIO_READ: 576 error = copyin(ggio->gctl_data, 577 bp->bio_data, bp->bio_length); 578 if (error != 0) 579 bp->bio_error = error; 580 break; 581 case BIO_DELETE: 582 case BIO_WRITE: 583 break; 584 } 585 } 586 G_GATE_LOGREQ(2, bp, "Request done."); 587 g_io_deliver(bp, bp->bio_error); 588 } 589 g_gate_release(sc); 590 return (error); 591 } 592 } 593 return (ENOIOCTL); 594 } 595 596 static void 597 g_gate_device(void *unused __unused) 598 { 599 600 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 601 G_GATE_CTL_NAME); 602 } 603 604 static int 605 g_gate_modevent(module_t mod, int type, void *data) 606 { 607 int error = 0; 608 609 switch (type) { 610 case MOD_LOAD: 611 mtx_init(&g_gate_list_mtx, "gg_list_lock", NULL, MTX_DEF); 612 g_gate_device(NULL); 613 break; 614 case MOD_UNLOAD: 615 mtx_lock(&g_gate_list_mtx); 616 if (!LIST_EMPTY(&g_gate_list)) { 617 mtx_unlock(&g_gate_list_mtx); 618 error = EBUSY; 619 break; 620 } 621 mtx_unlock(&g_gate_list_mtx); 622 mtx_destroy(&g_gate_list_mtx); 623 if (status_dev != 0) 624 destroy_dev(status_dev); 625 break; 626 default: 627 break; 628 } 629 630 return (error); 631 } 632 static moduledata_t g_gate_module = { 633 G_GATE_MOD_NAME, 634 g_gate_modevent, 635 NULL 636 }; 637 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 638 DECLARE_GEOM_CLASS(g_gate_class, g_gate); 639