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/8.3/sys/geom/gate/g_gate.c 223602 2011-06-27 18:56:43Z trociny $"); 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(1, "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 case BIO_FLUSH: 182 /* XXX: Hack to allow read-only mounts. */ 183 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 184 g_io_deliver(bp, EPERM); 185 return; 186 } 187 break; 188 case BIO_GETATTR: 189 default: 190 G_GATE_LOGREQ(2, bp, "Ignoring request."); 191 g_io_deliver(bp, EOPNOTSUPP); 192 return; 193 } 194 195 mtx_lock(&sc->sc_queue_mtx); 196 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 197 mtx_unlock(&sc->sc_queue_mtx); 198 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 199 g_io_deliver(bp, ENOMEM); 200 return; 201 } 202 203 bp->bio_driver1 = (void *)sc->sc_seq; 204 sc->sc_seq++; 205 sc->sc_queue_count++; 206 207 bioq_insert_tail(&sc->sc_inqueue, bp); 208 wakeup(sc); 209 210 mtx_unlock(&sc->sc_queue_mtx); 211 } 212 213 static struct g_gate_softc * 214 g_gate_hold(int unit, const char *name) 215 { 216 struct g_gate_softc *sc = NULL; 217 218 mtx_lock(&g_gate_units_lock); 219 if (unit >= 0 && unit < g_gate_maxunits) 220 sc = g_gate_units[unit]; 221 else if (unit == G_GATE_NAME_GIVEN) { 222 KASSERT(name != NULL, ("name is NULL")); 223 for (unit = 0; unit < g_gate_maxunits; unit++) { 224 if (g_gate_units[unit] == NULL) 225 continue; 226 if (strcmp(name, 227 g_gate_units[unit]->sc_provider->name) != 0) { 228 continue; 229 } 230 sc = g_gate_units[unit]; 231 break; 232 } 233 } 234 if (sc != NULL) 235 sc->sc_ref++; 236 mtx_unlock(&g_gate_units_lock); 237 return (sc); 238 } 239 240 static void 241 g_gate_release(struct g_gate_softc *sc) 242 { 243 244 g_topology_assert_not(); 245 mtx_lock(&g_gate_units_lock); 246 sc->sc_ref--; 247 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 248 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 249 wakeup(&sc->sc_ref); 250 mtx_unlock(&g_gate_units_lock); 251 } 252 253 static int 254 g_gate_getunit(int unit, int *errorp) 255 { 256 257 mtx_assert(&g_gate_units_lock, MA_OWNED); 258 if (unit >= 0) { 259 if (unit >= g_gate_maxunits) 260 *errorp = EINVAL; 261 else if (g_gate_units[unit] == NULL) 262 return (unit); 263 else 264 *errorp = EEXIST; 265 } else { 266 for (unit = 0; unit < g_gate_maxunits; unit++) { 267 if (g_gate_units[unit] == NULL) 268 return (unit); 269 } 270 *errorp = ENFILE; 271 } 272 return (-1); 273 } 274 275 static void 276 g_gate_guard(void *arg) 277 { 278 struct g_gate_softc *sc; 279 struct bintime curtime; 280 struct bio *bp, *bp2; 281 282 sc = arg; 283 binuptime(&curtime); 284 g_gate_hold(sc->sc_unit, NULL); 285 mtx_lock(&sc->sc_queue_mtx); 286 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 287 if (curtime.sec - bp->bio_t0.sec < 5) 288 continue; 289 bioq_remove(&sc->sc_inqueue, bp); 290 sc->sc_queue_count--; 291 G_GATE_LOGREQ(1, bp, "Request timeout."); 292 g_io_deliver(bp, EIO); 293 } 294 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 295 if (curtime.sec - bp->bio_t0.sec < 5) 296 continue; 297 bioq_remove(&sc->sc_outqueue, bp); 298 sc->sc_queue_count--; 299 G_GATE_LOGREQ(1, bp, "Request timeout."); 300 g_io_deliver(bp, EIO); 301 } 302 mtx_unlock(&sc->sc_queue_mtx); 303 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 304 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 305 g_gate_guard, sc); 306 } 307 g_gate_release(sc); 308 } 309 310 static void 311 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 312 struct g_consumer *cp, struct g_provider *pp) 313 { 314 struct g_gate_softc *sc; 315 316 sc = gp->softc; 317 if (sc == NULL || pp != NULL || cp != NULL) 318 return; 319 g_gate_hold(sc->sc_unit, NULL); 320 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 321 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 322 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 323 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 324 "write-only"); 325 } else { 326 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 327 "read-write"); 328 } 329 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 330 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 331 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 332 sc->sc_queue_count); 333 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 334 sc->sc_queue_size); 335 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 336 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 337 g_topology_unlock(); 338 g_gate_release(sc); 339 g_topology_lock(); 340 } 341 342 static int 343 g_gate_create(struct g_gate_ctl_create *ggio) 344 { 345 struct g_gate_softc *sc; 346 struct g_geom *gp; 347 struct g_provider *pp; 348 char name[NAME_MAX]; 349 int error = 0, unit; 350 351 if (ggio->gctl_mediasize == 0) { 352 G_GATE_DEBUG(1, "Invalid media size."); 353 return (EINVAL); 354 } 355 if (ggio->gctl_sectorsize > 0 && !powerof2(ggio->gctl_sectorsize)) { 356 G_GATE_DEBUG(1, "Invalid sector size."); 357 return (EINVAL); 358 } 359 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 360 G_GATE_DEBUG(1, "Invalid media size."); 361 return (EINVAL); 362 } 363 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 364 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 365 G_GATE_DEBUG(1, "Invalid flags."); 366 return (EINVAL); 367 } 368 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 369 ggio->gctl_unit != G_GATE_NAME_GIVEN && 370 ggio->gctl_unit < 0) { 371 G_GATE_DEBUG(1, "Invalid unit number."); 372 return (EINVAL); 373 } 374 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 375 ggio->gctl_name[0] == '\0') { 376 G_GATE_DEBUG(1, "No device name."); 377 return (EINVAL); 378 } 379 380 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 381 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 382 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 383 sc->sc_seq = 1; 384 bioq_init(&sc->sc_inqueue); 385 bioq_init(&sc->sc_outqueue); 386 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 387 sc->sc_queue_count = 0; 388 sc->sc_queue_size = ggio->gctl_maxcount; 389 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 390 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 391 sc->sc_timeout = ggio->gctl_timeout; 392 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 393 mtx_lock(&g_gate_units_lock); 394 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 395 if (sc->sc_unit < 0) { 396 mtx_unlock(&g_gate_units_lock); 397 mtx_destroy(&sc->sc_queue_mtx); 398 free(sc, M_GATE); 399 return (error); 400 } 401 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 402 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 403 else { 404 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 405 sc->sc_unit); 406 } 407 /* Check for name collision. */ 408 for (unit = 0; unit < g_gate_maxunits; unit++) { 409 if (g_gate_units[unit] == NULL) 410 continue; 411 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 412 continue; 413 mtx_unlock(&g_gate_units_lock); 414 mtx_destroy(&sc->sc_queue_mtx); 415 free(sc, M_GATE); 416 return (EEXIST); 417 } 418 sc->sc_name = name; 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 mtx_lock(&g_gate_units_lock); 438 sc->sc_name = sc->sc_provider->name; 439 mtx_unlock(&g_gate_units_lock); 440 G_GATE_DEBUG(1, "Device %s created.", gp->name); 441 442 if (sc->sc_timeout > 0) { 443 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 444 g_gate_guard, sc); 445 } 446 return (0); 447 } 448 449 #define G_GATE_CHECK_VERSION(ggio) do { \ 450 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 451 printf("Version mismatch %d != %d.\n", \ 452 ggio->gctl_version, G_GATE_VERSION); \ 453 return (EINVAL); \ 454 } \ 455 } while (0) 456 static int 457 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 458 { 459 struct g_gate_softc *sc; 460 struct bio *bp; 461 int error = 0; 462 463 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 464 flags, td); 465 466 switch (cmd) { 467 case G_GATE_CMD_CREATE: 468 { 469 struct g_gate_ctl_create *ggio = (void *)addr; 470 471 G_GATE_CHECK_VERSION(ggio); 472 error = g_gate_create(ggio); 473 /* 474 * Reset TDP_GEOM flag. 475 * There are pending events for sure, because we just created 476 * new provider and other classes want to taste it, but we 477 * cannot answer on I/O requests until we're here. 478 */ 479 td->td_pflags &= ~TDP_GEOM; 480 return (error); 481 } 482 case G_GATE_CMD_DESTROY: 483 { 484 struct g_gate_ctl_destroy *ggio = (void *)addr; 485 486 G_GATE_CHECK_VERSION(ggio); 487 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 488 if (sc == NULL) 489 return (ENXIO); 490 g_topology_lock(); 491 mtx_lock(&g_gate_units_lock); 492 error = g_gate_destroy(sc, ggio->gctl_force); 493 g_topology_unlock(); 494 if (error != 0) 495 g_gate_release(sc); 496 return (error); 497 } 498 case G_GATE_CMD_CANCEL: 499 { 500 struct g_gate_ctl_cancel *ggio = (void *)addr; 501 struct bio *tbp, *lbp; 502 503 G_GATE_CHECK_VERSION(ggio); 504 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 505 if (sc == NULL) 506 return (ENXIO); 507 lbp = NULL; 508 mtx_lock(&sc->sc_queue_mtx); 509 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 510 if (ggio->gctl_seq == 0 || 511 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 512 G_GATE_LOGREQ(1, bp, "Request canceled."); 513 bioq_remove(&sc->sc_outqueue, bp); 514 /* 515 * Be sure to put requests back onto incoming 516 * queue in the proper order. 517 */ 518 if (lbp == NULL) 519 bioq_insert_head(&sc->sc_inqueue, bp); 520 else { 521 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 522 lbp, bp, bio_queue); 523 } 524 lbp = bp; 525 /* 526 * If only one request was canceled, leave now. 527 */ 528 if (ggio->gctl_seq != 0) 529 break; 530 } 531 } 532 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 533 ggio->gctl_unit = sc->sc_unit; 534 mtx_unlock(&sc->sc_queue_mtx); 535 g_gate_release(sc); 536 return (error); 537 } 538 case G_GATE_CMD_START: 539 { 540 struct g_gate_ctl_io *ggio = (void *)addr; 541 542 G_GATE_CHECK_VERSION(ggio); 543 sc = g_gate_hold(ggio->gctl_unit, NULL); 544 if (sc == NULL) 545 return (ENXIO); 546 error = 0; 547 for (;;) { 548 mtx_lock(&sc->sc_queue_mtx); 549 bp = bioq_first(&sc->sc_inqueue); 550 if (bp != NULL) 551 break; 552 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 553 ggio->gctl_error = ECANCELED; 554 mtx_unlock(&sc->sc_queue_mtx); 555 goto start_end; 556 } 557 if (msleep(sc, &sc->sc_queue_mtx, 558 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 559 ggio->gctl_error = ECANCELED; 560 goto start_end; 561 } 562 } 563 ggio->gctl_cmd = bp->bio_cmd; 564 if ((bp->bio_cmd == BIO_DELETE || bp->bio_cmd == BIO_WRITE) && 565 bp->bio_length > ggio->gctl_length) { 566 mtx_unlock(&sc->sc_queue_mtx); 567 ggio->gctl_length = bp->bio_length; 568 ggio->gctl_error = ENOMEM; 569 goto start_end; 570 } 571 bioq_remove(&sc->sc_inqueue, bp); 572 bioq_insert_tail(&sc->sc_outqueue, bp); 573 mtx_unlock(&sc->sc_queue_mtx); 574 575 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 576 ggio->gctl_offset = bp->bio_offset; 577 ggio->gctl_length = bp->bio_length; 578 579 switch (bp->bio_cmd) { 580 case BIO_READ: 581 case BIO_DELETE: 582 case BIO_FLUSH: 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 case BIO_FLUSH: 647 break; 648 } 649 } 650 G_GATE_LOGREQ(2, bp, "Request done."); 651 g_io_deliver(bp, bp->bio_error); 652 } 653 done_end: 654 g_gate_release(sc); 655 return (error); 656 } 657 } 658 return (ENOIOCTL); 659 } 660 661 static void 662 g_gate_device(void) 663 { 664 665 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 666 G_GATE_CTL_NAME); 667 } 668 669 static int 670 g_gate_modevent(module_t mod, int type, void *data) 671 { 672 int error = 0; 673 674 switch (type) { 675 case MOD_LOAD: 676 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 677 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 678 M_GATE, M_WAITOK | M_ZERO); 679 g_gate_nunits = 0; 680 g_gate_device(); 681 break; 682 case MOD_UNLOAD: 683 mtx_lock(&g_gate_units_lock); 684 if (g_gate_nunits > 0) { 685 mtx_unlock(&g_gate_units_lock); 686 error = EBUSY; 687 break; 688 } 689 mtx_unlock(&g_gate_units_lock); 690 mtx_destroy(&g_gate_units_lock); 691 if (status_dev != 0) 692 destroy_dev(status_dev); 693 free(g_gate_units, M_GATE); 694 break; 695 default: 696 return (EOPNOTSUPP); 697 break; 698 } 699 700 return (error); 701 } 702 static moduledata_t g_gate_module = { 703 G_GATE_MOD_NAME, 704 g_gate_modevent, 705 NULL 706 }; 707 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 708 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
Cache object: 3cc03c30d75fe0cd90c1259c0d661519
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