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 * 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: releng/8.1/sys/geom/gate/g_gate.c 209487 2010-06-23 23:03:25Z pjd $"); 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 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 57 58 SYSCTL_DECL(_kern_geom); 59 SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, "GEOM_GATE stuff"); 60 static int g_gate_debug = 0; 61 TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug); 62 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 63 "Debug level"); 64 static u_int g_gate_maxunits = 256; 65 TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits); 66 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN, 67 &g_gate_maxunits, 0, "Maximum number of ggate devices"); 68 69 struct g_class g_gate_class = { 70 .name = G_GATE_CLASS_NAME, 71 .version = G_VERSION, 72 }; 73 74 static struct cdev *status_dev; 75 static d_ioctl_t g_gate_ioctl; 76 static struct cdevsw g_gate_cdevsw = { 77 .d_version = D_VERSION, 78 .d_ioctl = g_gate_ioctl, 79 .d_name = G_GATE_CTL_NAME 80 }; 81 82 83 static struct g_gate_softc **g_gate_units; 84 static u_int g_gate_nunits; 85 static struct mtx g_gate_units_lock; 86 87 static int 88 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 89 { 90 struct g_provider *pp; 91 struct g_geom *gp; 92 struct bio *bp; 93 94 g_topology_assert(); 95 mtx_assert(&g_gate_units_lock, MA_OWNED); 96 pp = sc->sc_provider; 97 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 98 mtx_unlock(&g_gate_units_lock); 99 return (EBUSY); 100 } 101 mtx_unlock(&g_gate_units_lock); 102 mtx_lock(&sc->sc_queue_mtx); 103 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 104 sc->sc_flags |= G_GATE_FLAG_DESTROY; 105 wakeup(sc); 106 mtx_unlock(&sc->sc_queue_mtx); 107 gp = pp->geom; 108 pp->flags |= G_PF_WITHER; 109 g_orphan_provider(pp, ENXIO); 110 callout_drain(&sc->sc_callout); 111 mtx_lock(&sc->sc_queue_mtx); 112 while ((bp = bioq_first(&sc->sc_inqueue)) != NULL) { 113 bioq_remove(&sc->sc_inqueue, bp); 114 sc->sc_queue_count--; 115 G_GATE_LOGREQ(1, bp, "Request canceled."); 116 g_io_deliver(bp, ENXIO); 117 } 118 while ((bp = bioq_first(&sc->sc_outqueue)) != NULL) { 119 bioq_remove(&sc->sc_outqueue, bp); 120 sc->sc_queue_count--; 121 G_GATE_LOGREQ(1, bp, "Request canceled."); 122 g_io_deliver(bp, ENXIO); 123 } 124 mtx_unlock(&sc->sc_queue_mtx); 125 g_topology_unlock(); 126 mtx_lock(&g_gate_units_lock); 127 /* One reference is ours. */ 128 sc->sc_ref--; 129 while (sc->sc_ref > 0) 130 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 131 g_gate_units[sc->sc_unit] = NULL; 132 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 133 g_gate_nunits--; 134 mtx_unlock(&g_gate_units_lock); 135 mtx_destroy(&sc->sc_queue_mtx); 136 g_topology_lock(); 137 G_GATE_DEBUG(0, "Device %s destroyed.", gp->name); 138 gp->softc = NULL; 139 g_wither_geom(gp, ENXIO); 140 sc->sc_provider = NULL; 141 free(sc, M_GATE); 142 return (0); 143 } 144 145 static int 146 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 147 { 148 struct g_gate_softc *sc; 149 150 if (dr <= 0 && dw <= 0 && de <= 0) 151 return (0); 152 sc = pp->geom->softc; 153 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 154 return (ENXIO); 155 /* XXX: Hack to allow read-only mounts. */ 156 #if 0 157 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 158 return (EPERM); 159 #endif 160 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 161 return (EPERM); 162 return (0); 163 } 164 165 static void 166 g_gate_start(struct bio *bp) 167 { 168 struct g_gate_softc *sc; 169 170 sc = bp->bio_to->geom->softc; 171 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 172 g_io_deliver(bp, ENXIO); 173 return; 174 } 175 G_GATE_LOGREQ(2, bp, "Request received."); 176 switch (bp->bio_cmd) { 177 case BIO_READ: 178 break; 179 case BIO_DELETE: 180 case BIO_WRITE: 181 /* XXX: Hack to allow read-only mounts. */ 182 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 183 g_io_deliver(bp, EPERM); 184 return; 185 } 186 break; 187 case BIO_GETATTR: 188 default: 189 G_GATE_LOGREQ(2, bp, "Ignoring request."); 190 g_io_deliver(bp, EOPNOTSUPP); 191 return; 192 } 193 194 mtx_lock(&sc->sc_queue_mtx); 195 if (sc->sc_queue_count > sc->sc_queue_size) { 196 mtx_unlock(&sc->sc_queue_mtx); 197 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 198 g_io_deliver(bp, ENOMEM); 199 return; 200 } 201 202 bp->bio_driver1 = (void *)sc->sc_seq; 203 sc->sc_seq++; 204 sc->sc_queue_count++; 205 206 bioq_insert_tail(&sc->sc_inqueue, bp); 207 wakeup(sc); 208 209 mtx_unlock(&sc->sc_queue_mtx); 210 } 211 212 static struct g_gate_softc * 213 g_gate_hold(int unit, const char *name) 214 { 215 struct g_gate_softc *sc = NULL; 216 217 mtx_lock(&g_gate_units_lock); 218 if (unit >= 0 && unit < g_gate_maxunits) 219 sc = g_gate_units[unit]; 220 else if (unit == G_GATE_NAME_GIVEN) { 221 KASSERT(name != NULL, ("name is NULL")); 222 for (unit = 0; unit < g_gate_maxunits; unit++) { 223 if (g_gate_units[unit] == NULL) 224 continue; 225 if (strcmp(name, 226 g_gate_units[unit]->sc_provider->name) != 0) { 227 continue; 228 } 229 sc = g_gate_units[unit]; 230 break; 231 } 232 } 233 if (sc != NULL) 234 sc->sc_ref++; 235 mtx_unlock(&g_gate_units_lock); 236 return (sc); 237 } 238 239 static void 240 g_gate_release(struct g_gate_softc *sc) 241 { 242 243 g_topology_assert_not(); 244 mtx_lock(&g_gate_units_lock); 245 sc->sc_ref--; 246 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 247 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 248 wakeup(&sc->sc_ref); 249 mtx_unlock(&g_gate_units_lock); 250 } 251 252 static int 253 g_gate_getunit(int unit, int *errorp) 254 { 255 256 mtx_assert(&g_gate_units_lock, MA_OWNED); 257 if (unit >= 0) { 258 if (unit >= g_gate_maxunits) 259 *errorp = EINVAL; 260 else if (g_gate_units[unit] == NULL) 261 return (unit); 262 else 263 *errorp = EEXIST; 264 } else { 265 for (unit = 0; unit < g_gate_maxunits; unit++) { 266 if (g_gate_units[unit] == NULL) 267 return (unit); 268 } 269 *errorp = ENFILE; 270 } 271 return (-1); 272 } 273 274 static void 275 g_gate_guard(void *arg) 276 { 277 struct g_gate_softc *sc; 278 struct bintime curtime; 279 struct bio *bp, *bp2; 280 281 sc = arg; 282 binuptime(&curtime); 283 g_gate_hold(sc->sc_unit, NULL); 284 mtx_lock(&sc->sc_queue_mtx); 285 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 286 if (curtime.sec - bp->bio_t0.sec < 5) 287 continue; 288 bioq_remove(&sc->sc_inqueue, bp); 289 sc->sc_queue_count--; 290 G_GATE_LOGREQ(1, bp, "Request timeout."); 291 g_io_deliver(bp, EIO); 292 } 293 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 294 if (curtime.sec - bp->bio_t0.sec < 5) 295 continue; 296 bioq_remove(&sc->sc_outqueue, bp); 297 sc->sc_queue_count--; 298 G_GATE_LOGREQ(1, bp, "Request timeout."); 299 g_io_deliver(bp, EIO); 300 } 301 mtx_unlock(&sc->sc_queue_mtx); 302 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 303 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 304 g_gate_guard, sc); 305 } 306 g_gate_release(sc); 307 } 308 309 static void 310 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 311 struct g_consumer *cp, struct g_provider *pp) 312 { 313 struct g_gate_softc *sc; 314 315 sc = gp->softc; 316 if (sc == NULL || pp != NULL || cp != NULL) 317 return; 318 g_gate_hold(sc->sc_unit, NULL); 319 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 320 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 321 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 322 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 323 "write-only"); 324 } else { 325 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 326 "read-write"); 327 } 328 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 329 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 330 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 331 sc->sc_queue_count); 332 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 333 sc->sc_queue_size); 334 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 335 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 336 g_topology_unlock(); 337 g_gate_release(sc); 338 g_topology_lock(); 339 } 340 341 static int 342 g_gate_create(struct g_gate_ctl_create *ggio) 343 { 344 struct g_gate_softc *sc; 345 struct g_geom *gp; 346 struct g_provider *pp; 347 char name[NAME_MAX]; 348 int error = 0, unit; 349 350 if (ggio->gctl_mediasize == 0) { 351 G_GATE_DEBUG(1, "Invalid media size."); 352 return (EINVAL); 353 } 354 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 355 G_GATE_DEBUG(1, "Invalid sector size."); 356 return (EINVAL); 357 } 358 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 359 G_GATE_DEBUG(1, "Invalid media size."); 360 return (EINVAL); 361 } 362 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 363 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 364 G_GATE_DEBUG(1, "Invalid flags."); 365 return (EINVAL); 366 } 367 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 368 ggio->gctl_unit != G_GATE_NAME_GIVEN && 369 ggio->gctl_unit < 0) { 370 G_GATE_DEBUG(1, "Invalid unit number."); 371 return (EINVAL); 372 } 373 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 374 ggio->gctl_name[0] == '\0') { 375 G_GATE_DEBUG(1, "No device name."); 376 return (EINVAL); 377 } 378 379 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 380 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 381 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 382 sc->sc_seq = 1; 383 bioq_init(&sc->sc_inqueue); 384 bioq_init(&sc->sc_outqueue); 385 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 386 sc->sc_queue_count = 0; 387 sc->sc_queue_size = ggio->gctl_maxcount; 388 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 389 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 390 sc->sc_timeout = ggio->gctl_timeout; 391 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 392 mtx_lock(&g_gate_units_lock); 393 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 394 if (sc->sc_unit < 0) { 395 mtx_unlock(&g_gate_units_lock); 396 mtx_destroy(&sc->sc_queue_mtx); 397 free(sc, M_GATE); 398 return (error); 399 } 400 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 401 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 402 else { 403 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 404 sc->sc_unit); 405 } 406 /* Check for name collision. */ 407 for (unit = 0; unit < g_gate_maxunits; unit++) { 408 if (g_gate_units[unit] == NULL) 409 continue; 410 if (strcmp(name, g_gate_units[unit]->sc_provider->name) != 0) 411 continue; 412 mtx_unlock(&g_gate_units_lock); 413 mtx_destroy(&sc->sc_queue_mtx); 414 free(sc, M_GATE); 415 return (EEXIST); 416 } 417 g_gate_units[sc->sc_unit] = sc; 418 g_gate_nunits++; 419 mtx_unlock(&g_gate_units_lock); 420 421 ggio->gctl_unit = sc->sc_unit; 422 423 g_topology_lock(); 424 gp = g_new_geomf(&g_gate_class, "%s", name); 425 gp->start = g_gate_start; 426 gp->access = g_gate_access; 427 gp->dumpconf = g_gate_dumpconf; 428 gp->softc = sc; 429 pp = g_new_providerf(gp, "%s", name); 430 pp->mediasize = ggio->gctl_mediasize; 431 pp->sectorsize = ggio->gctl_sectorsize; 432 sc->sc_provider = pp; 433 g_error_provider(pp, 0); 434 g_topology_unlock(); 435 436 if (sc->sc_timeout > 0) { 437 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 438 g_gate_guard, sc); 439 } 440 return (0); 441 } 442 443 #define G_GATE_CHECK_VERSION(ggio) do { \ 444 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 445 printf("Version mismatch %d != %d.\n", \ 446 ggio->gctl_version, G_GATE_VERSION); \ 447 return (EINVAL); \ 448 } \ 449 } while (0) 450 static int 451 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 452 { 453 struct g_gate_softc *sc; 454 struct bio *bp; 455 int error = 0; 456 457 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 458 flags, td); 459 460 switch (cmd) { 461 case G_GATE_CMD_CREATE: 462 { 463 struct g_gate_ctl_create *ggio = (void *)addr; 464 465 G_GATE_CHECK_VERSION(ggio); 466 error = g_gate_create(ggio); 467 /* 468 * Reset TDP_GEOM flag. 469 * There are pending events for sure, because we just created 470 * new provider and other classes want to taste it, but we 471 * cannot answer on I/O requests until we're here. 472 */ 473 td->td_pflags &= ~TDP_GEOM; 474 return (error); 475 } 476 case G_GATE_CMD_DESTROY: 477 { 478 struct g_gate_ctl_destroy *ggio = (void *)addr; 479 480 G_GATE_CHECK_VERSION(ggio); 481 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 482 if (sc == NULL) 483 return (ENXIO); 484 g_topology_lock(); 485 mtx_lock(&g_gate_units_lock); 486 error = g_gate_destroy(sc, ggio->gctl_force); 487 g_topology_unlock(); 488 if (error != 0) 489 g_gate_release(sc); 490 return (error); 491 } 492 case G_GATE_CMD_CANCEL: 493 { 494 struct g_gate_ctl_cancel *ggio = (void *)addr; 495 struct bio *tbp, *lbp; 496 497 G_GATE_CHECK_VERSION(ggio); 498 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 499 if (sc == NULL) 500 return (ENXIO); 501 lbp = NULL; 502 mtx_lock(&sc->sc_queue_mtx); 503 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 504 if (ggio->gctl_seq == 0 || 505 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 506 G_GATE_LOGREQ(1, bp, "Request canceled."); 507 bioq_remove(&sc->sc_outqueue, bp); 508 /* 509 * Be sure to put requests back onto incoming 510 * queue in the proper order. 511 */ 512 if (lbp == NULL) 513 bioq_insert_head(&sc->sc_inqueue, bp); 514 else { 515 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 516 lbp, bp, bio_queue); 517 } 518 lbp = bp; 519 /* 520 * If only one request was canceled, leave now. 521 */ 522 if (ggio->gctl_seq != 0) 523 break; 524 } 525 } 526 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 527 ggio->gctl_unit = sc->sc_unit; 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_hold(ggio->gctl_unit, NULL); 538 if (sc == NULL) 539 return (ENXIO); 540 error = 0; 541 for (;;) { 542 mtx_lock(&sc->sc_queue_mtx); 543 bp = bioq_first(&sc->sc_inqueue); 544 if (bp != NULL) 545 break; 546 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 547 ggio->gctl_error = ECANCELED; 548 mtx_unlock(&sc->sc_queue_mtx); 549 goto start_end; 550 } 551 if (msleep(sc, &sc->sc_queue_mtx, 552 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 553 ggio->gctl_error = ECANCELED; 554 goto start_end; 555 } 556 } 557 ggio->gctl_cmd = bp->bio_cmd; 558 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 559 bp->bio_length > ggio->gctl_length) { 560 mtx_unlock(&sc->sc_queue_mtx); 561 ggio->gctl_length = bp->bio_length; 562 ggio->gctl_error = ENOMEM; 563 goto start_end; 564 } 565 bioq_remove(&sc->sc_inqueue, bp); 566 bioq_insert_tail(&sc->sc_outqueue, bp); 567 mtx_unlock(&sc->sc_queue_mtx); 568 569 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 570 ggio->gctl_offset = bp->bio_offset; 571 ggio->gctl_length = bp->bio_length; 572 573 switch (bp->bio_cmd) { 574 case BIO_READ: 575 case BIO_DELETE: 576 break; 577 case BIO_WRITE: 578 error = copyout(bp->bio_data, ggio->gctl_data, 579 bp->bio_length); 580 if (error != 0) { 581 mtx_lock(&sc->sc_queue_mtx); 582 bioq_remove(&sc->sc_outqueue, bp); 583 bioq_insert_head(&sc->sc_inqueue, bp); 584 mtx_unlock(&sc->sc_queue_mtx); 585 goto start_end; 586 } 587 break; 588 } 589 start_end: 590 g_gate_release(sc); 591 return (error); 592 } 593 case G_GATE_CMD_DONE: 594 { 595 struct g_gate_ctl_io *ggio = (void *)addr; 596 597 G_GATE_CHECK_VERSION(ggio); 598 sc = g_gate_hold(ggio->gctl_unit, NULL); 599 if (sc == NULL) 600 return (ENOENT); 601 error = 0; 602 mtx_lock(&sc->sc_queue_mtx); 603 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 604 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 605 break; 606 } 607 if (bp != NULL) { 608 bioq_remove(&sc->sc_outqueue, bp); 609 sc->sc_queue_count--; 610 } 611 mtx_unlock(&sc->sc_queue_mtx); 612 if (bp == NULL) { 613 /* 614 * Request was probably canceled. 615 */ 616 goto done_end; 617 } 618 if (ggio->gctl_error == EAGAIN) { 619 bp->bio_error = 0; 620 G_GATE_LOGREQ(1, bp, "Request desisted."); 621 mtx_lock(&sc->sc_queue_mtx); 622 sc->sc_queue_count++; 623 bioq_insert_head(&sc->sc_inqueue, bp); 624 wakeup(sc); 625 mtx_unlock(&sc->sc_queue_mtx); 626 } else { 627 bp->bio_error = ggio->gctl_error; 628 if (bp->bio_error == 0) { 629 bp->bio_completed = bp->bio_length; 630 switch (bp->bio_cmd) { 631 case BIO_READ: 632 error = copyin(ggio->gctl_data, 633 bp->bio_data, bp->bio_length); 634 if (error != 0) 635 bp->bio_error = error; 636 break; 637 case BIO_DELETE: 638 case BIO_WRITE: 639 break; 640 } 641 } 642 G_GATE_LOGREQ(2, bp, "Request done."); 643 g_io_deliver(bp, bp->bio_error); 644 } 645 done_end: 646 g_gate_release(sc); 647 return (error); 648 } 649 } 650 return (ENOIOCTL); 651 } 652 653 static void 654 g_gate_device(void) 655 { 656 657 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 658 G_GATE_CTL_NAME); 659 } 660 661 static int 662 g_gate_modevent(module_t mod, int type, void *data) 663 { 664 int error = 0; 665 666 switch (type) { 667 case MOD_LOAD: 668 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 669 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 670 M_GATE, M_WAITOK | M_ZERO); 671 g_gate_nunits = 0; 672 g_gate_device(); 673 break; 674 case MOD_UNLOAD: 675 mtx_lock(&g_gate_units_lock); 676 if (g_gate_nunits > 0) { 677 mtx_unlock(&g_gate_units_lock); 678 error = EBUSY; 679 break; 680 } 681 mtx_unlock(&g_gate_units_lock); 682 mtx_destroy(&g_gate_units_lock); 683 if (status_dev != 0) 684 destroy_dev(status_dev); 685 free(g_gate_units, M_GATE); 686 break; 687 default: 688 return (EOPNOTSUPP); 689 break; 690 } 691 692 return (error); 693 } 694 static moduledata_t g_gate_module = { 695 G_GATE_MOD_NAME, 696 g_gate_modevent, 697 NULL 698 }; 699 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 700 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
Cache object: 9e98845a5a9b871549dde6f4af8a002c
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