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(1, "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_size > 0 && 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_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 sc->sc_name = name; 420 g_gate_units[sc->sc_unit] = sc; 421 g_gate_nunits++; 422 mtx_unlock(&g_gate_units_lock); 423 424 ggio->gctl_unit = sc->sc_unit; 425 426 g_topology_lock(); 427 gp = g_new_geomf(&g_gate_class, "%s", name); 428 gp->start = g_gate_start; 429 gp->access = g_gate_access; 430 gp->dumpconf = g_gate_dumpconf; 431 gp->softc = sc; 432 pp = g_new_providerf(gp, "%s", name); 433 pp->mediasize = ggio->gctl_mediasize; 434 pp->sectorsize = ggio->gctl_sectorsize; 435 sc->sc_provider = pp; 436 g_error_provider(pp, 0); 437 g_topology_unlock(); 438 mtx_lock(&g_gate_units_lock); 439 sc->sc_name = sc->sc_provider->name; 440 mtx_unlock(&g_gate_units_lock); 441 G_GATE_DEBUG(1, "Device %s created.", gp->name); 442 443 if (sc->sc_timeout > 0) { 444 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 445 g_gate_guard, sc); 446 } 447 return (0); 448 } 449 450 #define G_GATE_CHECK_VERSION(ggio) do { \ 451 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 452 printf("Version mismatch %d != %d.\n", \ 453 ggio->gctl_version, G_GATE_VERSION); \ 454 return (EINVAL); \ 455 } \ 456 } while (0) 457 static int 458 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 459 { 460 struct g_gate_softc *sc; 461 struct bio *bp; 462 int error = 0; 463 464 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 465 flags, td); 466 467 switch (cmd) { 468 case G_GATE_CMD_CREATE: 469 { 470 struct g_gate_ctl_create *ggio = (void *)addr; 471 472 G_GATE_CHECK_VERSION(ggio); 473 error = g_gate_create(ggio); 474 /* 475 * Reset TDP_GEOM flag. 476 * There are pending events for sure, because we just created 477 * new provider and other classes want to taste it, but we 478 * cannot answer on I/O requests until we're here. 479 */ 480 td->td_pflags &= ~TDP_GEOM; 481 return (error); 482 } 483 case G_GATE_CMD_DESTROY: 484 { 485 struct g_gate_ctl_destroy *ggio = (void *)addr; 486 487 G_GATE_CHECK_VERSION(ggio); 488 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 489 if (sc == NULL) 490 return (ENXIO); 491 g_topology_lock(); 492 mtx_lock(&g_gate_units_lock); 493 error = g_gate_destroy(sc, ggio->gctl_force); 494 g_topology_unlock(); 495 if (error != 0) 496 g_gate_release(sc); 497 return (error); 498 } 499 case G_GATE_CMD_CANCEL: 500 { 501 struct g_gate_ctl_cancel *ggio = (void *)addr; 502 struct bio *tbp, *lbp; 503 504 G_GATE_CHECK_VERSION(ggio); 505 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 506 if (sc == NULL) 507 return (ENXIO); 508 lbp = NULL; 509 mtx_lock(&sc->sc_queue_mtx); 510 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 511 if (ggio->gctl_seq == 0 || 512 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 513 G_GATE_LOGREQ(1, bp, "Request canceled."); 514 bioq_remove(&sc->sc_outqueue, bp); 515 /* 516 * Be sure to put requests back onto incoming 517 * queue in the proper order. 518 */ 519 if (lbp == NULL) 520 bioq_insert_head(&sc->sc_inqueue, bp); 521 else { 522 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 523 lbp, bp, bio_queue); 524 } 525 lbp = bp; 526 /* 527 * If only one request was canceled, leave now. 528 */ 529 if (ggio->gctl_seq != 0) 530 break; 531 } 532 } 533 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 534 ggio->gctl_unit = sc->sc_unit; 535 mtx_unlock(&sc->sc_queue_mtx); 536 g_gate_release(sc); 537 return (error); 538 } 539 case G_GATE_CMD_START: 540 { 541 struct g_gate_ctl_io *ggio = (void *)addr; 542 543 G_GATE_CHECK_VERSION(ggio); 544 sc = g_gate_hold(ggio->gctl_unit, NULL); 545 if (sc == NULL) 546 return (ENXIO); 547 error = 0; 548 for (;;) { 549 mtx_lock(&sc->sc_queue_mtx); 550 bp = bioq_first(&sc->sc_inqueue); 551 if (bp != NULL) 552 break; 553 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 554 ggio->gctl_error = ECANCELED; 555 mtx_unlock(&sc->sc_queue_mtx); 556 goto start_end; 557 } 558 if (msleep(sc, &sc->sc_queue_mtx, 559 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 560 ggio->gctl_error = ECANCELED; 561 goto start_end; 562 } 563 } 564 ggio->gctl_cmd = bp->bio_cmd; 565 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 566 bp->bio_length > ggio->gctl_length) { 567 mtx_unlock(&sc->sc_queue_mtx); 568 ggio->gctl_length = bp->bio_length; 569 ggio->gctl_error = ENOMEM; 570 goto start_end; 571 } 572 bioq_remove(&sc->sc_inqueue, bp); 573 bioq_insert_tail(&sc->sc_outqueue, bp); 574 mtx_unlock(&sc->sc_queue_mtx); 575 576 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 577 ggio->gctl_offset = bp->bio_offset; 578 ggio->gctl_length = bp->bio_length; 579 580 switch (bp->bio_cmd) { 581 case BIO_READ: 582 case BIO_DELETE: 583 break; 584 case BIO_WRITE: 585 error = copyout(bp->bio_data, ggio->gctl_data, 586 bp->bio_length); 587 if (error != 0) { 588 mtx_lock(&sc->sc_queue_mtx); 589 bioq_remove(&sc->sc_outqueue, bp); 590 bioq_insert_head(&sc->sc_inqueue, bp); 591 mtx_unlock(&sc->sc_queue_mtx); 592 goto start_end; 593 } 594 break; 595 } 596 start_end: 597 g_gate_release(sc); 598 return (error); 599 } 600 case G_GATE_CMD_DONE: 601 { 602 struct g_gate_ctl_io *ggio = (void *)addr; 603 604 G_GATE_CHECK_VERSION(ggio); 605 sc = g_gate_hold(ggio->gctl_unit, NULL); 606 if (sc == NULL) 607 return (ENOENT); 608 error = 0; 609 mtx_lock(&sc->sc_queue_mtx); 610 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 611 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 612 break; 613 } 614 if (bp != NULL) { 615 bioq_remove(&sc->sc_outqueue, bp); 616 sc->sc_queue_count--; 617 } 618 mtx_unlock(&sc->sc_queue_mtx); 619 if (bp == NULL) { 620 /* 621 * Request was probably canceled. 622 */ 623 goto done_end; 624 } 625 if (ggio->gctl_error == EAGAIN) { 626 bp->bio_error = 0; 627 G_GATE_LOGREQ(1, bp, "Request desisted."); 628 mtx_lock(&sc->sc_queue_mtx); 629 sc->sc_queue_count++; 630 bioq_insert_head(&sc->sc_inqueue, bp); 631 wakeup(sc); 632 mtx_unlock(&sc->sc_queue_mtx); 633 } else { 634 bp->bio_error = ggio->gctl_error; 635 if (bp->bio_error == 0) { 636 bp->bio_completed = bp->bio_length; 637 switch (bp->bio_cmd) { 638 case BIO_READ: 639 error = copyin(ggio->gctl_data, 640 bp->bio_data, bp->bio_length); 641 if (error != 0) 642 bp->bio_error = error; 643 break; 644 case BIO_DELETE: 645 case BIO_WRITE: 646 break; 647 } 648 } 649 G_GATE_LOGREQ(2, bp, "Request done."); 650 g_io_deliver(bp, bp->bio_error); 651 } 652 done_end: 653 g_gate_release(sc); 654 return (error); 655 } 656 } 657 return (ENOIOCTL); 658 } 659 660 static void 661 g_gate_device(void) 662 { 663 664 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 665 G_GATE_CTL_NAME); 666 } 667 668 static int 669 g_gate_modevent(module_t mod, int type, void *data) 670 { 671 int error = 0; 672 673 switch (type) { 674 case MOD_LOAD: 675 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 676 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 677 M_GATE, M_WAITOK | M_ZERO); 678 g_gate_nunits = 0; 679 g_gate_device(); 680 break; 681 case MOD_UNLOAD: 682 mtx_lock(&g_gate_units_lock); 683 if (g_gate_nunits > 0) { 684 mtx_unlock(&g_gate_units_lock); 685 error = EBUSY; 686 break; 687 } 688 mtx_unlock(&g_gate_units_lock); 689 mtx_destroy(&g_gate_units_lock); 690 if (status_dev != 0) 691 destroy_dev(status_dev); 692 free(g_gate_units, M_GATE); 693 break; 694 default: 695 return (EOPNOTSUPP); 696 break; 697 } 698 699 return (error); 700 } 701 static moduledata_t g_gate_module = { 702 G_GATE_MOD_NAME, 703 g_gate_modevent, 704 NULL 705 }; 706 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 707 DECLARE_GEOM_CLASS(g_gate_class, g_gate); 708