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) 2004-2006 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/10.0/sys/geom/gate/g_gate.c 248720 2013-03-26 05:42:12Z mav $"); 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/sbuf.h> 49 #include <sys/sysctl.h> 50 #include <sys/signalvar.h> 51 #include <sys/time.h> 52 #include <machine/atomic.h> 53 54 #include <geom/geom.h> 55 #include <geom/gate/g_gate.h> 56 57 FEATURE(geom_gate, "GEOM Gate module"); 58 59 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 60 61 SYSCTL_DECL(_kern_geom); 62 static SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, 63 "GEOM_GATE configuration"); 64 static int g_gate_debug = 0; 65 TUNABLE_INT("kern.geom.gate.debug", &g_gate_debug); 66 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RW, &g_gate_debug, 0, 67 "Debug level"); 68 static u_int g_gate_maxunits = 256; 69 TUNABLE_INT("kern.geom.gate.maxunits", &g_gate_maxunits); 70 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN, 71 &g_gate_maxunits, 0, "Maximum number of ggate devices"); 72 73 struct g_class g_gate_class = { 74 .name = G_GATE_CLASS_NAME, 75 .version = G_VERSION, 76 }; 77 78 static struct cdev *status_dev; 79 static d_ioctl_t g_gate_ioctl; 80 static struct cdevsw g_gate_cdevsw = { 81 .d_version = D_VERSION, 82 .d_ioctl = g_gate_ioctl, 83 .d_name = G_GATE_CTL_NAME 84 }; 85 86 87 static struct g_gate_softc **g_gate_units; 88 static u_int g_gate_nunits; 89 static struct mtx g_gate_units_lock; 90 91 static int 92 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 93 { 94 struct g_provider *pp; 95 struct g_consumer *cp; 96 struct g_geom *gp; 97 struct bio *bp; 98 99 g_topology_assert(); 100 mtx_assert(&g_gate_units_lock, MA_OWNED); 101 pp = sc->sc_provider; 102 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 103 mtx_unlock(&g_gate_units_lock); 104 return (EBUSY); 105 } 106 mtx_unlock(&g_gate_units_lock); 107 mtx_lock(&sc->sc_queue_mtx); 108 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 109 sc->sc_flags |= G_GATE_FLAG_DESTROY; 110 wakeup(sc); 111 mtx_unlock(&sc->sc_queue_mtx); 112 gp = pp->geom; 113 pp->flags |= G_PF_WITHER; 114 g_orphan_provider(pp, ENXIO); 115 callout_drain(&sc->sc_callout); 116 mtx_lock(&sc->sc_queue_mtx); 117 while ((bp = bioq_first(&sc->sc_inqueue)) != 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 } 123 while ((bp = bioq_first(&sc->sc_outqueue)) != NULL) { 124 bioq_remove(&sc->sc_outqueue, bp); 125 sc->sc_queue_count--; 126 G_GATE_LOGREQ(1, bp, "Request canceled."); 127 g_io_deliver(bp, ENXIO); 128 } 129 mtx_unlock(&sc->sc_queue_mtx); 130 g_topology_unlock(); 131 mtx_lock(&g_gate_units_lock); 132 /* One reference is ours. */ 133 sc->sc_ref--; 134 while (sc->sc_ref > 0) 135 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 136 g_gate_units[sc->sc_unit] = NULL; 137 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 138 g_gate_nunits--; 139 mtx_unlock(&g_gate_units_lock); 140 mtx_destroy(&sc->sc_queue_mtx); 141 g_topology_lock(); 142 if ((cp = sc->sc_readcons) != NULL) { 143 sc->sc_readcons = NULL; 144 (void)g_access(cp, -1, 0, 0); 145 g_detach(cp); 146 g_destroy_consumer(cp); 147 } 148 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name); 149 gp->softc = NULL; 150 g_wither_geom(gp, ENXIO); 151 sc->sc_provider = NULL; 152 free(sc, M_GATE); 153 return (0); 154 } 155 156 static int 157 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 158 { 159 struct g_gate_softc *sc; 160 161 if (dr <= 0 && dw <= 0 && de <= 0) 162 return (0); 163 sc = pp->geom->softc; 164 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 165 return (ENXIO); 166 /* XXX: Hack to allow read-only mounts. */ 167 #if 0 168 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 169 return (EPERM); 170 #endif 171 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 172 return (EPERM); 173 return (0); 174 } 175 176 static void 177 g_gate_queue_io(struct bio *bp) 178 { 179 struct g_gate_softc *sc; 180 181 sc = bp->bio_to->geom->softc; 182 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 183 g_io_deliver(bp, ENXIO); 184 return; 185 } 186 187 mtx_lock(&sc->sc_queue_mtx); 188 189 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 190 mtx_unlock(&sc->sc_queue_mtx); 191 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 192 g_io_deliver(bp, ENOMEM); 193 return; 194 } 195 196 bp->bio_driver1 = (void *)sc->sc_seq; 197 sc->sc_seq++; 198 sc->sc_queue_count++; 199 200 bioq_insert_tail(&sc->sc_inqueue, bp); 201 wakeup(sc); 202 203 mtx_unlock(&sc->sc_queue_mtx); 204 } 205 206 static void 207 g_gate_done(struct bio *cbp) 208 { 209 struct bio *pbp; 210 211 pbp = cbp->bio_parent; 212 if (cbp->bio_error == 0) { 213 pbp->bio_completed = cbp->bio_completed; 214 g_destroy_bio(cbp); 215 pbp->bio_inbed++; 216 g_io_deliver(pbp, 0); 217 } else { 218 /* If direct read failed, pass it through userland daemon. */ 219 g_destroy_bio(cbp); 220 pbp->bio_children--; 221 g_gate_queue_io(pbp); 222 } 223 } 224 225 static void 226 g_gate_start(struct bio *pbp) 227 { 228 struct g_gate_softc *sc; 229 230 sc = pbp->bio_to->geom->softc; 231 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 232 g_io_deliver(pbp, ENXIO); 233 return; 234 } 235 G_GATE_LOGREQ(2, pbp, "Request received."); 236 switch (pbp->bio_cmd) { 237 case BIO_READ: 238 if (sc->sc_readcons != NULL) { 239 struct bio *cbp; 240 241 cbp = g_clone_bio(pbp); 242 if (cbp == NULL) { 243 g_io_deliver(pbp, ENOMEM); 244 return; 245 } 246 cbp->bio_done = g_gate_done; 247 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset; 248 cbp->bio_to = sc->sc_readcons->provider; 249 g_io_request(cbp, sc->sc_readcons); 250 return; 251 } 252 break; 253 case BIO_DELETE: 254 case BIO_WRITE: 255 case BIO_FLUSH: 256 /* XXX: Hack to allow read-only mounts. */ 257 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 258 g_io_deliver(pbp, EPERM); 259 return; 260 } 261 break; 262 case BIO_GETATTR: 263 default: 264 G_GATE_LOGREQ(2, pbp, "Ignoring request."); 265 g_io_deliver(pbp, EOPNOTSUPP); 266 return; 267 } 268 269 g_gate_queue_io(pbp); 270 } 271 272 static struct g_gate_softc * 273 g_gate_hold(int unit, const char *name) 274 { 275 struct g_gate_softc *sc = NULL; 276 277 mtx_lock(&g_gate_units_lock); 278 if (unit >= 0 && unit < g_gate_maxunits) 279 sc = g_gate_units[unit]; 280 else if (unit == G_GATE_NAME_GIVEN) { 281 KASSERT(name != NULL, ("name is NULL")); 282 for (unit = 0; unit < g_gate_maxunits; unit++) { 283 if (g_gate_units[unit] == NULL) 284 continue; 285 if (strcmp(name, 286 g_gate_units[unit]->sc_provider->name) != 0) { 287 continue; 288 } 289 sc = g_gate_units[unit]; 290 break; 291 } 292 } 293 if (sc != NULL) 294 sc->sc_ref++; 295 mtx_unlock(&g_gate_units_lock); 296 return (sc); 297 } 298 299 static void 300 g_gate_release(struct g_gate_softc *sc) 301 { 302 303 g_topology_assert_not(); 304 mtx_lock(&g_gate_units_lock); 305 sc->sc_ref--; 306 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 307 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 308 wakeup(&sc->sc_ref); 309 mtx_unlock(&g_gate_units_lock); 310 } 311 312 static int 313 g_gate_getunit(int unit, int *errorp) 314 { 315 316 mtx_assert(&g_gate_units_lock, MA_OWNED); 317 if (unit >= 0) { 318 if (unit >= g_gate_maxunits) 319 *errorp = EINVAL; 320 else if (g_gate_units[unit] == NULL) 321 return (unit); 322 else 323 *errorp = EEXIST; 324 } else { 325 for (unit = 0; unit < g_gate_maxunits; unit++) { 326 if (g_gate_units[unit] == NULL) 327 return (unit); 328 } 329 *errorp = ENFILE; 330 } 331 return (-1); 332 } 333 334 static void 335 g_gate_guard(void *arg) 336 { 337 struct g_gate_softc *sc; 338 struct bintime curtime; 339 struct bio *bp, *bp2; 340 341 sc = arg; 342 binuptime(&curtime); 343 g_gate_hold(sc->sc_unit, NULL); 344 mtx_lock(&sc->sc_queue_mtx); 345 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 346 if (curtime.sec - bp->bio_t0.sec < 5) 347 continue; 348 bioq_remove(&sc->sc_inqueue, bp); 349 sc->sc_queue_count--; 350 G_GATE_LOGREQ(1, bp, "Request timeout."); 351 g_io_deliver(bp, EIO); 352 } 353 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 354 if (curtime.sec - bp->bio_t0.sec < 5) 355 continue; 356 bioq_remove(&sc->sc_outqueue, bp); 357 sc->sc_queue_count--; 358 G_GATE_LOGREQ(1, bp, "Request timeout."); 359 g_io_deliver(bp, EIO); 360 } 361 mtx_unlock(&sc->sc_queue_mtx); 362 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 363 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 364 g_gate_guard, sc); 365 } 366 g_gate_release(sc); 367 } 368 369 static void 370 g_gate_orphan(struct g_consumer *cp) 371 { 372 struct g_gate_softc *sc; 373 struct g_geom *gp; 374 375 g_topology_assert(); 376 gp = cp->geom; 377 sc = gp->softc; 378 if (sc == NULL) 379 return; 380 KASSERT(cp == sc->sc_readcons, ("cp=%p sc_readcons=%p", cp, 381 sc->sc_readcons)); 382 sc->sc_readcons = NULL; 383 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.", 384 cp->provider->name); 385 (void)g_access(cp, -1, 0, 0); 386 g_detach(cp); 387 g_destroy_consumer(cp); 388 } 389 390 static void 391 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 392 struct g_consumer *cp, struct g_provider *pp) 393 { 394 struct g_gate_softc *sc; 395 396 sc = gp->softc; 397 if (sc == NULL || pp != NULL || cp != NULL) 398 return; 399 sc = g_gate_hold(sc->sc_unit, NULL); 400 if (sc == NULL) 401 return; 402 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 403 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 404 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 405 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 406 "write-only"); 407 } else { 408 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 409 "read-write"); 410 } 411 if (sc->sc_readcons != NULL) { 412 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n", 413 indent, (intmax_t)sc->sc_readoffset); 414 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n", 415 indent, sc->sc_readcons->provider->name); 416 } 417 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 418 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 419 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 420 sc->sc_queue_count); 421 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 422 sc->sc_queue_size); 423 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 424 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 425 g_topology_unlock(); 426 g_gate_release(sc); 427 g_topology_lock(); 428 } 429 430 static int 431 g_gate_create(struct g_gate_ctl_create *ggio) 432 { 433 struct g_gate_softc *sc; 434 struct g_geom *gp; 435 struct g_provider *pp, *ropp; 436 struct g_consumer *cp; 437 char name[NAME_MAX]; 438 int error = 0, unit; 439 440 if (ggio->gctl_mediasize <= 0) { 441 G_GATE_DEBUG(1, "Invalid media size."); 442 return (EINVAL); 443 } 444 if (ggio->gctl_sectorsize <= 0) { 445 G_GATE_DEBUG(1, "Invalid sector size."); 446 return (EINVAL); 447 } 448 if (!powerof2(ggio->gctl_sectorsize)) { 449 G_GATE_DEBUG(1, "Invalid sector size."); 450 return (EINVAL); 451 } 452 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 453 G_GATE_DEBUG(1, "Invalid media size."); 454 return (EINVAL); 455 } 456 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 457 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 458 G_GATE_DEBUG(1, "Invalid flags."); 459 return (EINVAL); 460 } 461 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 462 ggio->gctl_unit != G_GATE_NAME_GIVEN && 463 ggio->gctl_unit < 0) { 464 G_GATE_DEBUG(1, "Invalid unit number."); 465 return (EINVAL); 466 } 467 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 468 ggio->gctl_name[0] == '\0') { 469 G_GATE_DEBUG(1, "No device name."); 470 return (EINVAL); 471 } 472 473 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 474 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 475 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 476 sc->sc_seq = 1; 477 bioq_init(&sc->sc_inqueue); 478 bioq_init(&sc->sc_outqueue); 479 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 480 sc->sc_queue_count = 0; 481 sc->sc_queue_size = ggio->gctl_maxcount; 482 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 483 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 484 sc->sc_timeout = ggio->gctl_timeout; 485 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 486 487 mtx_lock(&g_gate_units_lock); 488 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 489 if (sc->sc_unit < 0) 490 goto fail1; 491 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 492 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 493 else { 494 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 495 sc->sc_unit); 496 } 497 /* Check for name collision. */ 498 for (unit = 0; unit < g_gate_maxunits; unit++) { 499 if (g_gate_units[unit] == NULL) 500 continue; 501 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 502 continue; 503 error = EEXIST; 504 goto fail1; 505 } 506 sc->sc_name = name; 507 g_gate_units[sc->sc_unit] = sc; 508 g_gate_nunits++; 509 mtx_unlock(&g_gate_units_lock); 510 511 g_topology_lock(); 512 513 if (ggio->gctl_readprov[0] == '\0') { 514 ropp = NULL; 515 } else { 516 ropp = g_provider_by_name(ggio->gctl_readprov); 517 if (ropp == NULL) { 518 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 519 ggio->gctl_readprov); 520 error = EINVAL; 521 goto fail2; 522 } 523 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) { 524 G_GATE_DEBUG(1, "Invalid read offset."); 525 error = EINVAL; 526 goto fail2; 527 } 528 if (ggio->gctl_mediasize + ggio->gctl_readoffset > 529 ropp->mediasize) { 530 G_GATE_DEBUG(1, "Invalid read offset or media size."); 531 error = EINVAL; 532 goto fail2; 533 } 534 } 535 536 gp = g_new_geomf(&g_gate_class, "%s", name); 537 gp->start = g_gate_start; 538 gp->access = g_gate_access; 539 gp->orphan = g_gate_orphan; 540 gp->dumpconf = g_gate_dumpconf; 541 gp->softc = sc; 542 543 if (ropp != NULL) { 544 cp = g_new_consumer(gp); 545 error = g_attach(cp, ropp); 546 if (error != 0) { 547 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name); 548 goto fail3; 549 } 550 error = g_access(cp, 1, 0, 0); 551 if (error != 0) { 552 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name); 553 g_detach(cp); 554 goto fail3; 555 } 556 sc->sc_readcons = cp; 557 sc->sc_readoffset = ggio->gctl_readoffset; 558 } 559 560 ggio->gctl_unit = sc->sc_unit; 561 562 pp = g_new_providerf(gp, "%s", name); 563 pp->mediasize = ggio->gctl_mediasize; 564 pp->sectorsize = ggio->gctl_sectorsize; 565 sc->sc_provider = pp; 566 g_error_provider(pp, 0); 567 568 g_topology_unlock(); 569 mtx_lock(&g_gate_units_lock); 570 sc->sc_name = sc->sc_provider->name; 571 mtx_unlock(&g_gate_units_lock); 572 G_GATE_DEBUG(1, "Device %s created.", gp->name); 573 574 if (sc->sc_timeout > 0) { 575 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 576 g_gate_guard, sc); 577 } 578 return (0); 579 fail3: 580 g_destroy_consumer(cp); 581 g_destroy_geom(gp); 582 fail2: 583 g_topology_unlock(); 584 mtx_lock(&g_gate_units_lock); 585 g_gate_units[sc->sc_unit] = NULL; 586 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 587 g_gate_nunits--; 588 fail1: 589 mtx_unlock(&g_gate_units_lock); 590 mtx_destroy(&sc->sc_queue_mtx); 591 free(sc, M_GATE); 592 return (error); 593 } 594 595 static int 596 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio) 597 { 598 struct g_provider *pp; 599 struct g_consumer *cp; 600 int error; 601 602 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) { 603 if (ggio->gctl_mediasize <= 0) { 604 G_GATE_DEBUG(1, "Invalid media size."); 605 return (EINVAL); 606 } 607 pp = sc->sc_provider; 608 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) { 609 G_GATE_DEBUG(1, "Invalid media size."); 610 return (EINVAL); 611 } 612 /* TODO */ 613 return (EOPNOTSUPP); 614 } 615 616 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0) 617 (void)strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 618 619 cp = NULL; 620 621 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 622 g_topology_lock(); 623 if (sc->sc_readcons != NULL) { 624 cp = sc->sc_readcons; 625 sc->sc_readcons = NULL; 626 (void)g_access(cp, -1, 0, 0); 627 g_detach(cp); 628 g_destroy_consumer(cp); 629 } 630 if (ggio->gctl_readprov[0] != '\0') { 631 pp = g_provider_by_name(ggio->gctl_readprov); 632 if (pp == NULL) { 633 g_topology_unlock(); 634 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 635 ggio->gctl_readprov); 636 return (EINVAL); 637 } 638 cp = g_new_consumer(sc->sc_provider->geom); 639 error = g_attach(cp, pp); 640 if (error != 0) { 641 G_GATE_DEBUG(1, "Unable to attach to %s.", 642 pp->name); 643 } else { 644 error = g_access(cp, 1, 0, 0); 645 if (error != 0) { 646 G_GATE_DEBUG(1, "Unable to access %s.", 647 pp->name); 648 g_detach(cp); 649 } 650 } 651 if (error != 0) { 652 g_destroy_consumer(cp); 653 g_topology_unlock(); 654 return (error); 655 } 656 } 657 } else { 658 cp = sc->sc_readcons; 659 } 660 661 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) { 662 if (cp == NULL) { 663 G_GATE_DEBUG(1, "No read provider."); 664 return (EINVAL); 665 } 666 pp = sc->sc_provider; 667 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) { 668 G_GATE_DEBUG(1, "Invalid read offset."); 669 return (EINVAL); 670 } 671 if (pp->mediasize + ggio->gctl_readoffset > 672 cp->provider->mediasize) { 673 G_GATE_DEBUG(1, "Invalid read offset or media size."); 674 return (EINVAL); 675 } 676 sc->sc_readoffset = ggio->gctl_readoffset; 677 } 678 679 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 680 sc->sc_readcons = cp; 681 g_topology_unlock(); 682 } 683 684 return (0); 685 } 686 687 #define G_GATE_CHECK_VERSION(ggio) do { \ 688 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 689 printf("Version mismatch %d != %d.\n", \ 690 ggio->gctl_version, G_GATE_VERSION); \ 691 return (EINVAL); \ 692 } \ 693 } while (0) 694 static int 695 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 696 { 697 struct g_gate_softc *sc; 698 struct bio *bp; 699 int error = 0; 700 701 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 702 flags, td); 703 704 switch (cmd) { 705 case G_GATE_CMD_CREATE: 706 { 707 struct g_gate_ctl_create *ggio = (void *)addr; 708 709 G_GATE_CHECK_VERSION(ggio); 710 error = g_gate_create(ggio); 711 /* 712 * Reset TDP_GEOM flag. 713 * There are pending events for sure, because we just created 714 * new provider and other classes want to taste it, but we 715 * cannot answer on I/O requests until we're here. 716 */ 717 td->td_pflags &= ~TDP_GEOM; 718 return (error); 719 } 720 case G_GATE_CMD_MODIFY: 721 { 722 struct g_gate_ctl_modify *ggio = (void *)addr; 723 724 G_GATE_CHECK_VERSION(ggio); 725 sc = g_gate_hold(ggio->gctl_unit, NULL); 726 if (sc == NULL) 727 return (ENXIO); 728 error = g_gate_modify(sc, ggio); 729 g_gate_release(sc); 730 return (error); 731 } 732 case G_GATE_CMD_DESTROY: 733 { 734 struct g_gate_ctl_destroy *ggio = (void *)addr; 735 736 G_GATE_CHECK_VERSION(ggio); 737 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 738 if (sc == NULL) 739 return (ENXIO); 740 g_topology_lock(); 741 mtx_lock(&g_gate_units_lock); 742 error = g_gate_destroy(sc, ggio->gctl_force); 743 g_topology_unlock(); 744 if (error != 0) 745 g_gate_release(sc); 746 return (error); 747 } 748 case G_GATE_CMD_CANCEL: 749 { 750 struct g_gate_ctl_cancel *ggio = (void *)addr; 751 struct bio *tbp, *lbp; 752 753 G_GATE_CHECK_VERSION(ggio); 754 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 755 if (sc == NULL) 756 return (ENXIO); 757 lbp = NULL; 758 mtx_lock(&sc->sc_queue_mtx); 759 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 760 if (ggio->gctl_seq == 0 || 761 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 762 G_GATE_LOGREQ(1, bp, "Request canceled."); 763 bioq_remove(&sc->sc_outqueue, bp); 764 /* 765 * Be sure to put requests back onto incoming 766 * queue in the proper order. 767 */ 768 if (lbp == NULL) 769 bioq_insert_head(&sc->sc_inqueue, bp); 770 else { 771 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 772 lbp, bp, bio_queue); 773 } 774 lbp = bp; 775 /* 776 * If only one request was canceled, leave now. 777 */ 778 if (ggio->gctl_seq != 0) 779 break; 780 } 781 } 782 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 783 ggio->gctl_unit = sc->sc_unit; 784 mtx_unlock(&sc->sc_queue_mtx); 785 g_gate_release(sc); 786 return (error); 787 } 788 case G_GATE_CMD_START: 789 { 790 struct g_gate_ctl_io *ggio = (void *)addr; 791 792 G_GATE_CHECK_VERSION(ggio); 793 sc = g_gate_hold(ggio->gctl_unit, NULL); 794 if (sc == NULL) 795 return (ENXIO); 796 error = 0; 797 for (;;) { 798 mtx_lock(&sc->sc_queue_mtx); 799 bp = bioq_first(&sc->sc_inqueue); 800 if (bp != NULL) 801 break; 802 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 803 ggio->gctl_error = ECANCELED; 804 mtx_unlock(&sc->sc_queue_mtx); 805 goto start_end; 806 } 807 if (msleep(sc, &sc->sc_queue_mtx, 808 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 809 ggio->gctl_error = ECANCELED; 810 goto start_end; 811 } 812 } 813 ggio->gctl_cmd = bp->bio_cmd; 814 if (bp->bio_cmd == BIO_WRITE && 815 bp->bio_length > ggio->gctl_length) { 816 mtx_unlock(&sc->sc_queue_mtx); 817 ggio->gctl_length = bp->bio_length; 818 ggio->gctl_error = ENOMEM; 819 goto start_end; 820 } 821 bioq_remove(&sc->sc_inqueue, bp); 822 bioq_insert_tail(&sc->sc_outqueue, bp); 823 mtx_unlock(&sc->sc_queue_mtx); 824 825 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 826 ggio->gctl_offset = bp->bio_offset; 827 ggio->gctl_length = bp->bio_length; 828 829 switch (bp->bio_cmd) { 830 case BIO_READ: 831 case BIO_DELETE: 832 case BIO_FLUSH: 833 break; 834 case BIO_WRITE: 835 error = copyout(bp->bio_data, ggio->gctl_data, 836 bp->bio_length); 837 if (error != 0) { 838 mtx_lock(&sc->sc_queue_mtx); 839 bioq_remove(&sc->sc_outqueue, bp); 840 bioq_insert_head(&sc->sc_inqueue, bp); 841 mtx_unlock(&sc->sc_queue_mtx); 842 goto start_end; 843 } 844 break; 845 } 846 start_end: 847 g_gate_release(sc); 848 return (error); 849 } 850 case G_GATE_CMD_DONE: 851 { 852 struct g_gate_ctl_io *ggio = (void *)addr; 853 854 G_GATE_CHECK_VERSION(ggio); 855 sc = g_gate_hold(ggio->gctl_unit, NULL); 856 if (sc == NULL) 857 return (ENOENT); 858 error = 0; 859 mtx_lock(&sc->sc_queue_mtx); 860 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 861 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 862 break; 863 } 864 if (bp != NULL) { 865 bioq_remove(&sc->sc_outqueue, bp); 866 sc->sc_queue_count--; 867 } 868 mtx_unlock(&sc->sc_queue_mtx); 869 if (bp == NULL) { 870 /* 871 * Request was probably canceled. 872 */ 873 goto done_end; 874 } 875 if (ggio->gctl_error == EAGAIN) { 876 bp->bio_error = 0; 877 G_GATE_LOGREQ(1, bp, "Request desisted."); 878 mtx_lock(&sc->sc_queue_mtx); 879 sc->sc_queue_count++; 880 bioq_insert_head(&sc->sc_inqueue, bp); 881 wakeup(sc); 882 mtx_unlock(&sc->sc_queue_mtx); 883 } else { 884 bp->bio_error = ggio->gctl_error; 885 if (bp->bio_error == 0) { 886 bp->bio_completed = bp->bio_length; 887 switch (bp->bio_cmd) { 888 case BIO_READ: 889 error = copyin(ggio->gctl_data, 890 bp->bio_data, bp->bio_length); 891 if (error != 0) 892 bp->bio_error = error; 893 break; 894 case BIO_DELETE: 895 case BIO_WRITE: 896 case BIO_FLUSH: 897 break; 898 } 899 } 900 G_GATE_LOGREQ(2, bp, "Request done."); 901 g_io_deliver(bp, bp->bio_error); 902 } 903 done_end: 904 g_gate_release(sc); 905 return (error); 906 } 907 } 908 return (ENOIOCTL); 909 } 910 911 static void 912 g_gate_device(void) 913 { 914 915 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 916 G_GATE_CTL_NAME); 917 } 918 919 static int 920 g_gate_modevent(module_t mod, int type, void *data) 921 { 922 int error = 0; 923 924 switch (type) { 925 case MOD_LOAD: 926 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 927 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 928 M_GATE, M_WAITOK | M_ZERO); 929 g_gate_nunits = 0; 930 g_gate_device(); 931 break; 932 case MOD_UNLOAD: 933 mtx_lock(&g_gate_units_lock); 934 if (g_gate_nunits > 0) { 935 mtx_unlock(&g_gate_units_lock); 936 error = EBUSY; 937 break; 938 } 939 mtx_unlock(&g_gate_units_lock); 940 mtx_destroy(&g_gate_units_lock); 941 if (status_dev != 0) 942 destroy_dev(status_dev); 943 free(g_gate_units, M_GATE); 944 break; 945 default: 946 return (EOPNOTSUPP); 947 break; 948 } 949 950 return (error); 951 } 952 static moduledata_t g_gate_module = { 953 G_GATE_MOD_NAME, 954 g_gate_modevent, 955 NULL 956 }; 957 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 958 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
Cache object: 4f580eac33430f7be8790a401a33eb27
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