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) 2004-2005 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: releng/6.0/sys/geom/gate/g_gate.c 147887 2005-07-10 21:10:20Z pjd $ 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 .version = G_VERSION, 64 .destroy_geom = g_gate_destroy_geom 65 }; 66 67 static struct cdev *status_dev; 68 static d_ioctl_t g_gate_ioctl; 69 static struct cdevsw g_gate_cdevsw = { 70 .d_version = D_VERSION, 71 .d_ioctl = g_gate_ioctl, 72 .d_name = G_GATE_CTL_NAME 73 }; 74 75 76 static LIST_HEAD(, g_gate_softc) g_gate_list = 77 LIST_HEAD_INITIALIZER(&g_gate_list); 78 static struct mtx g_gate_list_mtx; 79 80 81 static void 82 g_gate_wither(struct g_gate_softc *sc) 83 { 84 85 atomic_set_32(&sc->sc_flags, G_GATE_FLAG_DESTROY); 86 } 87 88 static int 89 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 90 { 91 struct g_provider *pp; 92 struct bio *bp; 93 94 g_topology_assert(); 95 mtx_assert(&g_gate_list_mtx, MA_OWNED); 96 pp = sc->sc_provider; 97 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 98 mtx_unlock(&g_gate_list_mtx); 99 return (EBUSY); 100 } 101 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 102 g_gate_wither(sc); 103 LIST_REMOVE(sc, sc_next); 104 } 105 mtx_unlock(&g_gate_list_mtx); 106 mtx_lock(&sc->sc_queue_mtx); 107 wakeup(sc); 108 mtx_unlock(&sc->sc_queue_mtx); 109 if (sc->sc_ref > 0) { 110 G_GATE_DEBUG(1, "Cannot destroy %s yet.", sc->sc_name); 111 return (0); 112 } 113 callout_drain(&sc->sc_callout); 114 mtx_lock(&sc->sc_queue_mtx); 115 for (;;) { 116 bp = bioq_first(&sc->sc_inqueue); 117 if (bp != NULL) { 118 bioq_remove(&sc->sc_inqueue, 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 for (;;) { 127 bp = bioq_first(&sc->sc_outqueue); 128 if (bp != NULL) { 129 bioq_remove(&sc->sc_outqueue, bp); 130 sc->sc_queue_count--; 131 G_GATE_LOGREQ(1, bp, "Request canceled."); 132 g_io_deliver(bp, ENXIO); 133 } else { 134 break; 135 } 136 } 137 mtx_destroy(&sc->sc_queue_mtx); 138 G_GATE_DEBUG(0, "Device %s destroyed.", sc->sc_name); 139 pp->geom->softc = NULL; 140 g_wither_geom(pp->geom, ENXIO); 141 sc->sc_provider = NULL; 142 free(sc, M_GATE); 143 return (0); 144 } 145 146 static void 147 g_gate_destroy_it(void *arg, int flag __unused) 148 { 149 struct g_gate_softc *sc; 150 151 g_topology_assert(); 152 sc = arg; 153 mtx_lock(&g_gate_list_mtx); 154 g_gate_destroy(sc, 1); 155 } 156 157 static int 158 g_gate_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 159 { 160 161 g_topology_assert(); 162 mtx_lock(&g_gate_list_mtx); 163 return (g_gate_destroy(gp->softc, 0)); 164 } 165 166 static int 167 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 168 { 169 struct g_gate_softc *sc; 170 171 if (dr <= 0 && dw <= 0 && de <= 0) 172 return (0); 173 sc = pp->geom->softc; 174 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 175 return (ENXIO); 176 /* XXX: Hack to allow read-only mounts. */ 177 #if 0 178 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 179 return (EPERM); 180 #endif 181 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 182 return (EPERM); 183 return (0); 184 } 185 186 static void 187 g_gate_start(struct bio *bp) 188 { 189 struct g_gate_softc *sc; 190 191 sc = bp->bio_to->geom->softc; 192 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 193 g_io_deliver(bp, ENXIO); 194 return; 195 } 196 G_GATE_LOGREQ(2, bp, "Request received."); 197 switch (bp->bio_cmd) { 198 case BIO_READ: 199 break; 200 case BIO_DELETE: 201 case BIO_WRITE: 202 /* XXX: Hack to allow read-only mounts. */ 203 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 204 g_io_deliver(bp, EPERM); 205 return; 206 } 207 break; 208 case BIO_GETATTR: 209 default: 210 G_GATE_LOGREQ(2, bp, "Ignoring request."); 211 g_io_deliver(bp, EOPNOTSUPP); 212 return; 213 } 214 215 mtx_lock(&sc->sc_queue_mtx); 216 if (sc->sc_queue_count > sc->sc_queue_size) { 217 mtx_unlock(&sc->sc_queue_mtx); 218 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 219 g_io_deliver(bp, EIO); 220 return; 221 } 222 223 bp->bio_driver1 = (void *)sc->sc_seq; 224 sc->sc_seq++; 225 sc->sc_queue_count++; 226 227 bioq_insert_tail(&sc->sc_inqueue, bp); 228 wakeup(sc); 229 230 mtx_unlock(&sc->sc_queue_mtx); 231 } 232 233 static struct g_gate_softc * 234 g_gate_find(u_int unit) 235 { 236 struct g_gate_softc *sc; 237 238 LIST_FOREACH(sc, &g_gate_list, sc_next) { 239 if (sc->sc_unit == unit) 240 break; 241 } 242 return (sc); 243 } 244 245 static struct g_gate_softc * 246 g_gate_hold(u_int unit) 247 { 248 struct g_gate_softc *sc; 249 250 mtx_lock(&g_gate_list_mtx); 251 sc = g_gate_find(unit); 252 if (sc != NULL) { 253 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 254 sc = NULL; 255 else 256 sc->sc_ref++; 257 } 258 mtx_unlock(&g_gate_list_mtx); 259 return (sc); 260 } 261 262 static void 263 g_gate_release(struct g_gate_softc *sc) 264 { 265 266 g_topology_assert_not(); 267 mtx_lock(&g_gate_list_mtx); 268 sc->sc_ref--; 269 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 270 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 271 mtx_unlock(&g_gate_list_mtx); 272 g_waitfor_event(g_gate_destroy_it, sc, M_WAITOK, NULL); 273 } else { 274 mtx_unlock(&g_gate_list_mtx); 275 } 276 } 277 278 static int 279 g_gate_getunit(int unit) 280 { 281 struct g_gate_softc *sc; 282 283 mtx_assert(&g_gate_list_mtx, MA_OWNED); 284 if (unit >= 0) { 285 LIST_FOREACH(sc, &g_gate_list, sc_next) { 286 if (sc->sc_unit == unit) 287 return (-1); 288 } 289 } else { 290 unit = 0; 291 once_again: 292 LIST_FOREACH(sc, &g_gate_list, sc_next) { 293 if (sc->sc_unit == unit) { 294 if (++unit > 666) 295 return (-1); 296 goto once_again; 297 } 298 } 299 } 300 return (unit); 301 } 302 303 static void 304 g_gate_guard(void *arg) 305 { 306 struct g_gate_softc *sc; 307 struct bintime curtime; 308 struct bio *bp, *bp2; 309 310 sc = arg; 311 binuptime(&curtime); 312 g_gate_hold(sc->sc_unit); 313 mtx_lock(&sc->sc_queue_mtx); 314 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 315 if (curtime.sec - bp->bio_t0.sec < 5) 316 continue; 317 bioq_remove(&sc->sc_inqueue, bp); 318 sc->sc_queue_count--; 319 G_GATE_LOGREQ(1, bp, "Request timeout."); 320 g_io_deliver(bp, EIO); 321 } 322 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 323 if (curtime.sec - bp->bio_t0.sec < 5) 324 continue; 325 bioq_remove(&sc->sc_outqueue, bp); 326 sc->sc_queue_count--; 327 G_GATE_LOGREQ(1, bp, "Request timeout."); 328 g_io_deliver(bp, EIO); 329 } 330 mtx_unlock(&sc->sc_queue_mtx); 331 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 332 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 333 g_gate_guard, sc); 334 } 335 g_gate_release(sc); 336 } 337 338 static void 339 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 340 struct g_consumer *cp, struct g_provider *pp) 341 { 342 struct g_gate_softc *sc; 343 344 sc = gp->softc; 345 if (sc == NULL || pp != NULL || cp != NULL) 346 return; 347 g_gate_hold(sc->sc_unit); 348 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 349 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 350 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 351 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 352 "write-only"); 353 } else { 354 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 355 "read-write"); 356 } 357 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 358 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 359 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 360 sc->sc_queue_count); 361 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 362 sc->sc_queue_size); 363 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 364 g_topology_unlock(); 365 g_gate_release(sc); 366 g_topology_lock(); 367 } 368 369 static int 370 g_gate_create(struct g_gate_ctl_create *ggio) 371 { 372 struct g_gate_softc *sc; 373 struct g_geom *gp; 374 struct g_provider *pp; 375 376 if (ggio->gctl_mediasize == 0) { 377 G_GATE_DEBUG(1, "Invalid media size."); 378 return (EINVAL); 379 } 380 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 381 G_GATE_DEBUG(1, "Invalid sector size."); 382 return (EINVAL); 383 } 384 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 385 G_GATE_DEBUG(1, "Invalid media size."); 386 return (EINVAL); 387 } 388 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 389 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 390 G_GATE_DEBUG(1, "Invalid flags."); 391 return (EINVAL); 392 } 393 if (ggio->gctl_unit < -1) { 394 G_GATE_DEBUG(1, "Invalid unit number."); 395 return (EINVAL); 396 } 397 398 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 399 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 400 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 401 sc->sc_seq = 0; 402 bioq_init(&sc->sc_inqueue); 403 bioq_init(&sc->sc_outqueue); 404 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 405 sc->sc_queue_count = 0; 406 sc->sc_queue_size = ggio->gctl_maxcount; 407 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 408 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 409 sc->sc_timeout = ggio->gctl_timeout; 410 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 411 mtx_lock(&g_gate_list_mtx); 412 ggio->gctl_unit = g_gate_getunit(ggio->gctl_unit); 413 if (ggio->gctl_unit == -1) { 414 mtx_unlock(&g_gate_list_mtx); 415 mtx_destroy(&sc->sc_queue_mtx); 416 free(sc, M_GATE); 417 return (EBUSY); 418 } 419 sc->sc_unit = ggio->gctl_unit; 420 LIST_INSERT_HEAD(&g_gate_list, sc, sc_next); 421 mtx_unlock(&g_gate_list_mtx); 422 423 g_topology_lock(); 424 gp = g_new_geomf(&g_gate_class, "%s%d", G_GATE_PROVIDER_NAME, 425 sc->sc_unit); 426 gp->start = g_gate_start; 427 gp->access = g_gate_access; 428 gp->dumpconf = g_gate_dumpconf; 429 gp->softc = sc; 430 pp = g_new_providerf(gp, "%s%d", G_GATE_PROVIDER_NAME, sc->sc_unit); 431 pp->mediasize = ggio->gctl_mediasize; 432 pp->sectorsize = ggio->gctl_sectorsize; 433 sc->sc_provider = pp; 434 g_error_provider(pp, 0); 435 g_topology_unlock(); 436 437 if (sc->sc_timeout > 0) { 438 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 439 g_gate_guard, sc); 440 } 441 return (0); 442 } 443 444 #define G_GATE_CHECK_VERSION(ggio) do { \ 445 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 446 printf("Version mismatch %d != %d.\n", \ 447 ggio->gctl_version, G_GATE_VERSION); \ 448 return (EINVAL); \ 449 } \ 450 } while (0) 451 static int 452 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 453 { 454 struct g_gate_softc *sc; 455 struct bio *bp; 456 int error = 0; 457 458 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 459 flags, td); 460 461 switch (cmd) { 462 case G_GATE_CMD_CREATE: 463 { 464 struct g_gate_ctl_create *ggio = (void *)addr; 465 466 G_GATE_CHECK_VERSION(ggio); 467 error = g_gate_create(ggio); 468 /* 469 * Reset TDP_GEOM flag. 470 * There are pending events for sure, because we just created 471 * new provider and other classes want to taste it, but we 472 * cannot answer on I/O requests until we're here. 473 */ 474 td->td_pflags &= ~TDP_GEOM; 475 return (error); 476 } 477 case G_GATE_CMD_DESTROY: 478 { 479 struct g_gate_ctl_destroy *ggio = (void *)addr; 480 481 G_GATE_CHECK_VERSION(ggio); 482 sc = g_gate_hold(ggio->gctl_unit); 483 if (sc == NULL) 484 return (ENXIO); 485 g_topology_lock(); 486 mtx_lock(&g_gate_list_mtx); 487 error = g_gate_destroy(sc, ggio->gctl_force); 488 if (error == 0) 489 g_gate_wither(sc); 490 g_topology_unlock(); 491 g_gate_release(sc); 492 return (error); 493 } 494 case G_GATE_CMD_CANCEL: 495 { 496 struct g_gate_ctl_cancel *ggio = (void *)addr; 497 struct bio *tbp, *lbp; 498 499 G_GATE_CHECK_VERSION(ggio); 500 sc = g_gate_hold(ggio->gctl_unit); 501 if (sc == NULL) 502 return (ENXIO); 503 lbp = NULL; 504 mtx_lock(&sc->sc_queue_mtx); 505 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 506 if (ggio->gctl_seq == 0 || 507 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 508 G_GATE_LOGREQ(1, bp, "Request canceled."); 509 bioq_remove(&sc->sc_outqueue, bp); 510 /* 511 * Be sure to put requests back onto incoming 512 * queue in the proper order. 513 */ 514 if (lbp == NULL) 515 bioq_insert_head(&sc->sc_inqueue, bp); 516 else { 517 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 518 lbp, bp, bio_queue); 519 } 520 lbp = bp; 521 /* 522 * If only one request was canceled, leave now. 523 */ 524 if (ggio->gctl_seq != 0) 525 break; 526 } 527 } 528 mtx_unlock(&sc->sc_queue_mtx); 529 g_gate_release(sc); 530 return (error); 531 } 532 case G_GATE_CMD_START: 533 { 534 struct g_gate_ctl_io *ggio = (void *)addr; 535 536 G_GATE_CHECK_VERSION(ggio); 537 sc = g_gate_find(ggio->gctl_unit); 538 if (sc == NULL) 539 return (ENXIO); 540 for (;;) { 541 mtx_lock(&sc->sc_queue_mtx); 542 bp = bioq_first(&sc->sc_inqueue); 543 if (bp != NULL) 544 break; 545 if (msleep(sc, &sc->sc_queue_mtx, 546 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 547 ggio->gctl_error = ECANCELED; 548 return (0); 549 } 550 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 551 ggio->gctl_error = ECANCELED; 552 return (0); 553 } 554 } 555 ggio->gctl_cmd = bp->bio_cmd; 556 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 557 bp->bio_length > ggio->gctl_length) { 558 mtx_unlock(&sc->sc_queue_mtx); 559 ggio->gctl_length = bp->bio_length; 560 ggio->gctl_error = ENOMEM; 561 return (0); 562 } 563 bioq_remove(&sc->sc_inqueue, bp); 564 bioq_insert_tail(&sc->sc_outqueue, bp); 565 mtx_unlock(&sc->sc_queue_mtx); 566 567 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 568 ggio->gctl_offset = bp->bio_offset; 569 ggio->gctl_length = bp->bio_length; 570 571 switch (bp->bio_cmd) { 572 case BIO_READ: 573 break; 574 case BIO_DELETE: 575 case BIO_WRITE: 576 error = copyout(bp->bio_data, ggio->gctl_data, 577 bp->bio_length); 578 if (error != 0) { 579 mtx_lock(&sc->sc_queue_mtx); 580 bioq_remove(&sc->sc_outqueue, bp); 581 bioq_insert_head(&sc->sc_inqueue, bp); 582 mtx_unlock(&sc->sc_queue_mtx); 583 return (error); 584 } 585 break; 586 } 587 return (0); 588 } 589 case G_GATE_CMD_DONE: 590 { 591 struct g_gate_ctl_io *ggio = (void *)addr; 592 593 G_GATE_CHECK_VERSION(ggio); 594 sc = g_gate_find(ggio->gctl_unit); 595 if (sc == NULL) 596 return (ENOENT); 597 mtx_lock(&sc->sc_queue_mtx); 598 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 599 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 600 break; 601 } 602 if (bp != NULL) { 603 bioq_remove(&sc->sc_outqueue, bp); 604 sc->sc_queue_count--; 605 } 606 mtx_unlock(&sc->sc_queue_mtx); 607 if (bp == NULL) { 608 /* 609 * Request was probably canceled. 610 */ 611 return (0); 612 } 613 if (ggio->gctl_error == EAGAIN) { 614 bp->bio_error = 0; 615 G_GATE_LOGREQ(1, bp, "Request desisted."); 616 mtx_lock(&sc->sc_queue_mtx); 617 sc->sc_queue_count++; 618 bioq_insert_head(&sc->sc_inqueue, bp); 619 wakeup(sc); 620 mtx_unlock(&sc->sc_queue_mtx); 621 } else { 622 bp->bio_error = ggio->gctl_error; 623 if (bp->bio_error == 0) { 624 bp->bio_completed = bp->bio_length; 625 switch (bp->bio_cmd) { 626 case BIO_READ: 627 error = copyin(ggio->gctl_data, 628 bp->bio_data, bp->bio_length); 629 if (error != 0) 630 bp->bio_error = error; 631 break; 632 case BIO_DELETE: 633 case BIO_WRITE: 634 break; 635 } 636 } 637 G_GATE_LOGREQ(2, bp, "Request done."); 638 g_io_deliver(bp, bp->bio_error); 639 } 640 return (error); 641 } 642 } 643 return (ENOIOCTL); 644 } 645 646 static void 647 g_gate_device(void) 648 { 649 650 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 651 G_GATE_CTL_NAME); 652 } 653 654 static int 655 g_gate_modevent(module_t mod, int type, void *data) 656 { 657 int error = 0; 658 659 switch (type) { 660 case MOD_LOAD: 661 mtx_init(&g_gate_list_mtx, "gg_list_lock", NULL, MTX_DEF); 662 g_gate_device(); 663 break; 664 case MOD_UNLOAD: 665 mtx_lock(&g_gate_list_mtx); 666 if (!LIST_EMPTY(&g_gate_list)) { 667 mtx_unlock(&g_gate_list_mtx); 668 error = EBUSY; 669 break; 670 } 671 mtx_unlock(&g_gate_list_mtx); 672 mtx_destroy(&g_gate_list_mtx); 673 if (status_dev != 0) 674 destroy_dev(status_dev); 675 break; 676 default: 677 return (EOPNOTSUPP); 678 break; 679 } 680 681 return (error); 682 } 683 static moduledata_t g_gate_module = { 684 G_GATE_MOD_NAME, 685 g_gate_modevent, 686 NULL 687 }; 688 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 689 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
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