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 FEATURE(geom_gate, "GEOM Gate module"); 57 58 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 59 60 SYSCTL_DECL(_kern_geom); 61 SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, "GEOM_GATE stuff"); 62 static int g_gate_debug = 0; 63 TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug); 64 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 65 "Debug level"); 66 static u_int g_gate_maxunits = 256; 67 TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits); 68 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN, 69 &g_gate_maxunits, 0, "Maximum number of ggate devices"); 70 71 struct g_class g_gate_class = { 72 .name = G_GATE_CLASS_NAME, 73 .version = G_VERSION, 74 }; 75 76 static struct cdev *status_dev; 77 static d_ioctl_t g_gate_ioctl; 78 static struct cdevsw g_gate_cdevsw = { 79 .d_version = D_VERSION, 80 .d_ioctl = g_gate_ioctl, 81 .d_name = G_GATE_CTL_NAME 82 }; 83 84 85 static struct g_gate_softc **g_gate_units; 86 static u_int g_gate_nunits; 87 static struct mtx g_gate_units_lock; 88 89 static int 90 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 91 { 92 struct g_provider *pp; 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 G_GATE_DEBUG(0, "Device %s destroyed.", gp->name); 140 gp->softc = NULL; 141 g_wither_geom(gp, ENXIO); 142 sc->sc_provider = NULL; 143 free(sc, M_GATE); 144 return (0); 145 } 146 147 static int 148 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 149 { 150 struct g_gate_softc *sc; 151 152 if (dr <= 0 && dw <= 0 && de <= 0) 153 return (0); 154 sc = pp->geom->softc; 155 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 156 return (ENXIO); 157 /* XXX: Hack to allow read-only mounts. */ 158 #if 0 159 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 160 return (EPERM); 161 #endif 162 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 163 return (EPERM); 164 return (0); 165 } 166 167 static void 168 g_gate_start(struct bio *bp) 169 { 170 struct g_gate_softc *sc; 171 172 sc = bp->bio_to->geom->softc; 173 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 174 g_io_deliver(bp, ENXIO); 175 return; 176 } 177 G_GATE_LOGREQ(2, bp, "Request received."); 178 switch (bp->bio_cmd) { 179 case BIO_READ: 180 break; 181 case BIO_DELETE: 182 case BIO_WRITE: 183 /* XXX: Hack to allow read-only mounts. */ 184 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 185 g_io_deliver(bp, EPERM); 186 return; 187 } 188 break; 189 case BIO_GETATTR: 190 default: 191 G_GATE_LOGREQ(2, bp, "Ignoring request."); 192 g_io_deliver(bp, EOPNOTSUPP); 193 return; 194 } 195 196 mtx_lock(&sc->sc_queue_mtx); 197 if (sc->sc_queue_count > sc->sc_queue_size) { 198 mtx_unlock(&sc->sc_queue_mtx); 199 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 200 g_io_deliver(bp, ENOMEM); 201 return; 202 } 203 204 bp->bio_driver1 = (void *)sc->sc_seq; 205 sc->sc_seq++; 206 sc->sc_queue_count++; 207 208 bioq_insert_tail(&sc->sc_inqueue, bp); 209 wakeup(sc); 210 211 mtx_unlock(&sc->sc_queue_mtx); 212 } 213 214 static struct g_gate_softc * 215 g_gate_hold(int unit, const char *name) 216 { 217 struct g_gate_softc *sc = NULL; 218 219 mtx_lock(&g_gate_units_lock); 220 if (unit >= 0 && unit < g_gate_maxunits) 221 sc = g_gate_units[unit]; 222 else if (unit == G_GATE_NAME_GIVEN) { 223 KASSERT(name != NULL, ("name is NULL")); 224 for (unit = 0; unit < g_gate_maxunits; unit++) { 225 if (g_gate_units[unit] == NULL) 226 continue; 227 if (strcmp(name, 228 g_gate_units[unit]->sc_provider->name) != 0) { 229 continue; 230 } 231 sc = g_gate_units[unit]; 232 break; 233 } 234 } 235 if (sc != NULL) 236 sc->sc_ref++; 237 mtx_unlock(&g_gate_units_lock); 238 return (sc); 239 } 240 241 static void 242 g_gate_release(struct g_gate_softc *sc) 243 { 244 245 g_topology_assert_not(); 246 mtx_lock(&g_gate_units_lock); 247 sc->sc_ref--; 248 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 249 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 250 wakeup(&sc->sc_ref); 251 mtx_unlock(&g_gate_units_lock); 252 } 253 254 static int 255 g_gate_getunit(int unit, int *errorp) 256 { 257 258 mtx_assert(&g_gate_units_lock, MA_OWNED); 259 if (unit >= 0) { 260 if (unit >= g_gate_maxunits) 261 *errorp = EINVAL; 262 else if (g_gate_units[unit] == NULL) 263 return (unit); 264 else 265 *errorp = EEXIST; 266 } else { 267 for (unit = 0; unit < g_gate_maxunits; unit++) { 268 if (g_gate_units[unit] == NULL) 269 return (unit); 270 } 271 *errorp = ENFILE; 272 } 273 return (-1); 274 } 275 276 static void 277 g_gate_guard(void *arg) 278 { 279 struct g_gate_softc *sc; 280 struct bintime curtime; 281 struct bio *bp, *bp2; 282 283 sc = arg; 284 binuptime(&curtime); 285 g_gate_hold(sc->sc_unit, NULL); 286 mtx_lock(&sc->sc_queue_mtx); 287 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 288 if (curtime.sec - bp->bio_t0.sec < 5) 289 continue; 290 bioq_remove(&sc->sc_inqueue, bp); 291 sc->sc_queue_count--; 292 G_GATE_LOGREQ(1, bp, "Request timeout."); 293 g_io_deliver(bp, EIO); 294 } 295 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 296 if (curtime.sec - bp->bio_t0.sec < 5) 297 continue; 298 bioq_remove(&sc->sc_outqueue, bp); 299 sc->sc_queue_count--; 300 G_GATE_LOGREQ(1, bp, "Request timeout."); 301 g_io_deliver(bp, EIO); 302 } 303 mtx_unlock(&sc->sc_queue_mtx); 304 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 305 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 306 g_gate_guard, sc); 307 } 308 g_gate_release(sc); 309 } 310 311 static void 312 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 313 struct g_consumer *cp, struct g_provider *pp) 314 { 315 struct g_gate_softc *sc; 316 317 sc = gp->softc; 318 if (sc == NULL || pp != NULL || cp != NULL) 319 return; 320 g_gate_hold(sc->sc_unit, NULL); 321 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 322 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 323 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 324 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 325 "write-only"); 326 } else { 327 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 328 "read-write"); 329 } 330 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 331 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 332 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 333 sc->sc_queue_count); 334 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 335 sc->sc_queue_size); 336 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 337 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 338 g_topology_unlock(); 339 g_gate_release(sc); 340 g_topology_lock(); 341 } 342 343 static int 344 g_gate_create(struct g_gate_ctl_create *ggio) 345 { 346 struct g_gate_softc *sc; 347 struct g_geom *gp; 348 struct g_provider *pp; 349 char name[NAME_MAX]; 350 int error = 0, unit; 351 352 if (ggio->gctl_mediasize == 0) { 353 G_GATE_DEBUG(1, "Invalid media size."); 354 return (EINVAL); 355 } 356 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 357 G_GATE_DEBUG(1, "Invalid sector size."); 358 return (EINVAL); 359 } 360 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 361 G_GATE_DEBUG(1, "Invalid media size."); 362 return (EINVAL); 363 } 364 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 365 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 366 G_GATE_DEBUG(1, "Invalid flags."); 367 return (EINVAL); 368 } 369 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 370 ggio->gctl_unit != G_GATE_NAME_GIVEN && 371 ggio->gctl_unit < 0) { 372 G_GATE_DEBUG(1, "Invalid unit number."); 373 return (EINVAL); 374 } 375 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 376 ggio->gctl_name[0] == '\0') { 377 G_GATE_DEBUG(1, "No device name."); 378 return (EINVAL); 379 } 380 381 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 382 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 383 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 384 sc->sc_seq = 1; 385 bioq_init(&sc->sc_inqueue); 386 bioq_init(&sc->sc_outqueue); 387 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 388 sc->sc_queue_count = 0; 389 sc->sc_queue_size = ggio->gctl_maxcount; 390 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 391 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 392 sc->sc_timeout = ggio->gctl_timeout; 393 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 394 mtx_lock(&g_gate_units_lock); 395 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 396 if (sc->sc_unit < 0) { 397 mtx_unlock(&g_gate_units_lock); 398 mtx_destroy(&sc->sc_queue_mtx); 399 free(sc, M_GATE); 400 return (error); 401 } 402 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 403 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 404 else { 405 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 406 sc->sc_unit); 407 } 408 /* Check for name collision. */ 409 for (unit = 0; unit < g_gate_maxunits; unit++) { 410 if (g_gate_units[unit] == NULL) 411 continue; 412 if (strcmp(name, g_gate_units[unit]->sc_provider->name) != 0) 413 continue; 414 mtx_unlock(&g_gate_units_lock); 415 mtx_destroy(&sc->sc_queue_mtx); 416 free(sc, M_GATE); 417 return (EEXIST); 418 } 419 g_gate_units[sc->sc_unit] = sc; 420 g_gate_nunits++; 421 mtx_unlock(&g_gate_units_lock); 422 423 ggio->gctl_unit = sc->sc_unit; 424 425 g_topology_lock(); 426 gp = g_new_geomf(&g_gate_class, "%s", name); 427 gp->start = g_gate_start; 428 gp->access = g_gate_access; 429 gp->dumpconf = g_gate_dumpconf; 430 gp->softc = sc; 431 pp = g_new_providerf(gp, "%s", name); 432 pp->mediasize = ggio->gctl_mediasize; 433 pp->sectorsize = ggio->gctl_sectorsize; 434 sc->sc_provider = pp; 435 g_error_provider(pp, 0); 436 g_topology_unlock(); 437 438 if (sc->sc_timeout > 0) { 439 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 440 g_gate_guard, sc); 441 } 442 return (0); 443 } 444 445 #define G_GATE_CHECK_VERSION(ggio) do { \ 446 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 447 printf("Version mismatch %d != %d.\n", \ 448 ggio->gctl_version, G_GATE_VERSION); \ 449 return (EINVAL); \ 450 } \ 451 } while (0) 452 static int 453 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 454 { 455 struct g_gate_softc *sc; 456 struct bio *bp; 457 int error = 0; 458 459 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 460 flags, td); 461 462 switch (cmd) { 463 case G_GATE_CMD_CREATE: 464 { 465 struct g_gate_ctl_create *ggio = (void *)addr; 466 467 G_GATE_CHECK_VERSION(ggio); 468 error = g_gate_create(ggio); 469 /* 470 * Reset TDP_GEOM flag. 471 * There are pending events for sure, because we just created 472 * new provider and other classes want to taste it, but we 473 * cannot answer on I/O requests until we're here. 474 */ 475 td->td_pflags &= ~TDP_GEOM; 476 return (error); 477 } 478 case G_GATE_CMD_DESTROY: 479 { 480 struct g_gate_ctl_destroy *ggio = (void *)addr; 481 482 G_GATE_CHECK_VERSION(ggio); 483 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 484 if (sc == NULL) 485 return (ENXIO); 486 g_topology_lock(); 487 mtx_lock(&g_gate_units_lock); 488 error = g_gate_destroy(sc, ggio->gctl_force); 489 g_topology_unlock(); 490 if (error != 0) 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, ggio->gctl_name); 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 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 529 ggio->gctl_unit = sc->sc_unit; 530 mtx_unlock(&sc->sc_queue_mtx); 531 g_gate_release(sc); 532 return (error); 533 } 534 case G_GATE_CMD_START: 535 { 536 struct g_gate_ctl_io *ggio = (void *)addr; 537 538 G_GATE_CHECK_VERSION(ggio); 539 sc = g_gate_hold(ggio->gctl_unit, NULL); 540 if (sc == NULL) 541 return (ENXIO); 542 error = 0; 543 for (;;) { 544 mtx_lock(&sc->sc_queue_mtx); 545 bp = bioq_first(&sc->sc_inqueue); 546 if (bp != NULL) 547 break; 548 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 549 ggio->gctl_error = ECANCELED; 550 mtx_unlock(&sc->sc_queue_mtx); 551 goto start_end; 552 } 553 if (msleep(sc, &sc->sc_queue_mtx, 554 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 555 ggio->gctl_error = ECANCELED; 556 goto start_end; 557 } 558 } 559 ggio->gctl_cmd = bp->bio_cmd; 560 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 561 bp->bio_length > ggio->gctl_length) { 562 mtx_unlock(&sc->sc_queue_mtx); 563 ggio->gctl_length = bp->bio_length; 564 ggio->gctl_error = ENOMEM; 565 goto start_end; 566 } 567 bioq_remove(&sc->sc_inqueue, bp); 568 bioq_insert_tail(&sc->sc_outqueue, bp); 569 mtx_unlock(&sc->sc_queue_mtx); 570 571 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 572 ggio->gctl_offset = bp->bio_offset; 573 ggio->gctl_length = bp->bio_length; 574 575 switch (bp->bio_cmd) { 576 case BIO_READ: 577 case BIO_DELETE: 578 break; 579 case BIO_WRITE: 580 error = copyout(bp->bio_data, ggio->gctl_data, 581 bp->bio_length); 582 if (error != 0) { 583 mtx_lock(&sc->sc_queue_mtx); 584 bioq_remove(&sc->sc_outqueue, bp); 585 bioq_insert_head(&sc->sc_inqueue, bp); 586 mtx_unlock(&sc->sc_queue_mtx); 587 goto start_end; 588 } 589 break; 590 } 591 start_end: 592 g_gate_release(sc); 593 return (error); 594 } 595 case G_GATE_CMD_DONE: 596 { 597 struct g_gate_ctl_io *ggio = (void *)addr; 598 599 G_GATE_CHECK_VERSION(ggio); 600 sc = g_gate_hold(ggio->gctl_unit, NULL); 601 if (sc == NULL) 602 return (ENOENT); 603 error = 0; 604 mtx_lock(&sc->sc_queue_mtx); 605 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 606 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 607 break; 608 } 609 if (bp != NULL) { 610 bioq_remove(&sc->sc_outqueue, bp); 611 sc->sc_queue_count--; 612 } 613 mtx_unlock(&sc->sc_queue_mtx); 614 if (bp == NULL) { 615 /* 616 * Request was probably canceled. 617 */ 618 goto done_end; 619 } 620 if (ggio->gctl_error == EAGAIN) { 621 bp->bio_error = 0; 622 G_GATE_LOGREQ(1, bp, "Request desisted."); 623 mtx_lock(&sc->sc_queue_mtx); 624 sc->sc_queue_count++; 625 bioq_insert_head(&sc->sc_inqueue, bp); 626 wakeup(sc); 627 mtx_unlock(&sc->sc_queue_mtx); 628 } else { 629 bp->bio_error = ggio->gctl_error; 630 if (bp->bio_error == 0) { 631 bp->bio_completed = bp->bio_length; 632 switch (bp->bio_cmd) { 633 case BIO_READ: 634 error = copyin(ggio->gctl_data, 635 bp->bio_data, bp->bio_length); 636 if (error != 0) 637 bp->bio_error = error; 638 break; 639 case BIO_DELETE: 640 case BIO_WRITE: 641 break; 642 } 643 } 644 G_GATE_LOGREQ(2, bp, "Request done."); 645 g_io_deliver(bp, bp->bio_error); 646 } 647 done_end: 648 g_gate_release(sc); 649 return (error); 650 } 651 } 652 return (ENOIOCTL); 653 } 654 655 static void 656 g_gate_device(void) 657 { 658 659 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 660 G_GATE_CTL_NAME); 661 } 662 663 static int 664 g_gate_modevent(module_t mod, int type, void *data) 665 { 666 int error = 0; 667 668 switch (type) { 669 case MOD_LOAD: 670 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 671 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 672 M_GATE, M_WAITOK | M_ZERO); 673 g_gate_nunits = 0; 674 g_gate_device(); 675 break; 676 case MOD_UNLOAD: 677 mtx_lock(&g_gate_units_lock); 678 if (g_gate_nunits > 0) { 679 mtx_unlock(&g_gate_units_lock); 680 error = EBUSY; 681 break; 682 } 683 mtx_unlock(&g_gate_units_lock); 684 mtx_destroy(&g_gate_units_lock); 685 if (status_dev != 0) 686 destroy_dev(status_dev); 687 free(g_gate_units, M_GATE); 688 break; 689 default: 690 return (EOPNOTSUPP); 691 break; 692 } 693 694 return (error); 695 } 696 static moduledata_t g_gate_module = { 697 G_GATE_MOD_NAME, 698 g_gate_modevent, 699 NULL 700 }; 701 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 702 DECLARE_GEOM_CLASS(g_gate_class, g_gate); 703