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/11.1/sys/geom/gate/g_gate.c 306764 2016-10-06 15:35:36Z 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 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RWTUN, &g_gate_debug, 0, 66 "Debug level"); 67 static u_int g_gate_maxunits = 256; 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 bio_queue_head queue; 93 struct g_provider *pp; 94 struct g_consumer *cp; 95 struct g_geom *gp; 96 struct bio *bp; 97 98 g_topology_assert(); 99 mtx_assert(&g_gate_units_lock, MA_OWNED); 100 pp = sc->sc_provider; 101 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 102 mtx_unlock(&g_gate_units_lock); 103 return (EBUSY); 104 } 105 mtx_unlock(&g_gate_units_lock); 106 mtx_lock(&sc->sc_queue_mtx); 107 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 108 sc->sc_flags |= G_GATE_FLAG_DESTROY; 109 wakeup(sc); 110 mtx_unlock(&sc->sc_queue_mtx); 111 gp = pp->geom; 112 g_wither_provider(pp, ENXIO); 113 callout_drain(&sc->sc_callout); 114 bioq_init(&queue); 115 mtx_lock(&sc->sc_queue_mtx); 116 while ((bp = bioq_takefirst(&sc->sc_inqueue)) != NULL) { 117 sc->sc_queue_count--; 118 bioq_insert_tail(&queue, bp); 119 } 120 while ((bp = bioq_takefirst(&sc->sc_outqueue)) != NULL) { 121 sc->sc_queue_count--; 122 bioq_insert_tail(&queue, bp); 123 } 124 mtx_unlock(&sc->sc_queue_mtx); 125 g_topology_unlock(); 126 while ((bp = bioq_takefirst(&queue)) != NULL) { 127 G_GATE_LOGREQ(1, bp, "Request canceled."); 128 g_io_deliver(bp, ENXIO); 129 } 130 mtx_lock(&g_gate_units_lock); 131 /* One reference is ours. */ 132 sc->sc_ref--; 133 while (sc->sc_ref > 0) 134 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 135 g_gate_units[sc->sc_unit] = NULL; 136 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 137 g_gate_nunits--; 138 mtx_unlock(&g_gate_units_lock); 139 mtx_destroy(&sc->sc_queue_mtx); 140 g_topology_lock(); 141 if ((cp = sc->sc_readcons) != NULL) { 142 sc->sc_readcons = NULL; 143 (void)g_access(cp, -1, 0, 0); 144 g_detach(cp); 145 g_destroy_consumer(cp); 146 } 147 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name); 148 gp->softc = NULL; 149 g_wither_geom(gp, ENXIO); 150 sc->sc_provider = NULL; 151 free(sc, M_GATE); 152 return (0); 153 } 154 155 static int 156 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 157 { 158 struct g_gate_softc *sc; 159 160 if (dr <= 0 && dw <= 0 && de <= 0) 161 return (0); 162 sc = pp->geom->softc; 163 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 164 return (ENXIO); 165 /* XXX: Hack to allow read-only mounts. */ 166 #if 0 167 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 168 return (EPERM); 169 #endif 170 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 171 return (EPERM); 172 return (0); 173 } 174 175 static void 176 g_gate_queue_io(struct bio *bp) 177 { 178 struct g_gate_softc *sc; 179 180 sc = bp->bio_to->geom->softc; 181 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 182 g_io_deliver(bp, ENXIO); 183 return; 184 } 185 186 mtx_lock(&sc->sc_queue_mtx); 187 188 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 189 mtx_unlock(&sc->sc_queue_mtx); 190 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 191 g_io_deliver(bp, ENOMEM); 192 return; 193 } 194 195 bp->bio_driver1 = (void *)sc->sc_seq; 196 sc->sc_seq++; 197 sc->sc_queue_count++; 198 199 bioq_insert_tail(&sc->sc_inqueue, bp); 200 wakeup(sc); 201 202 mtx_unlock(&sc->sc_queue_mtx); 203 } 204 205 static void 206 g_gate_done(struct bio *cbp) 207 { 208 struct bio *pbp; 209 210 pbp = cbp->bio_parent; 211 if (cbp->bio_error == 0) { 212 pbp->bio_completed = cbp->bio_completed; 213 g_destroy_bio(cbp); 214 pbp->bio_inbed++; 215 g_io_deliver(pbp, 0); 216 } else { 217 /* If direct read failed, pass it through userland daemon. */ 218 g_destroy_bio(cbp); 219 pbp->bio_children--; 220 g_gate_queue_io(pbp); 221 } 222 } 223 224 static void 225 g_gate_start(struct bio *pbp) 226 { 227 struct g_gate_softc *sc; 228 229 sc = pbp->bio_to->geom->softc; 230 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 231 g_io_deliver(pbp, ENXIO); 232 return; 233 } 234 G_GATE_LOGREQ(2, pbp, "Request received."); 235 switch (pbp->bio_cmd) { 236 case BIO_READ: 237 if (sc->sc_readcons != NULL) { 238 struct bio *cbp; 239 240 cbp = g_clone_bio(pbp); 241 if (cbp == NULL) { 242 g_io_deliver(pbp, ENOMEM); 243 return; 244 } 245 cbp->bio_done = g_gate_done; 246 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset; 247 cbp->bio_to = sc->sc_readcons->provider; 248 g_io_request(cbp, sc->sc_readcons); 249 return; 250 } 251 break; 252 case BIO_DELETE: 253 case BIO_WRITE: 254 case BIO_FLUSH: 255 /* XXX: Hack to allow read-only mounts. */ 256 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 257 g_io_deliver(pbp, EPERM); 258 return; 259 } 260 break; 261 case BIO_GETATTR: 262 default: 263 G_GATE_LOGREQ(2, pbp, "Ignoring request."); 264 g_io_deliver(pbp, EOPNOTSUPP); 265 return; 266 } 267 268 g_gate_queue_io(pbp); 269 } 270 271 static struct g_gate_softc * 272 g_gate_hold(int unit, const char *name) 273 { 274 struct g_gate_softc *sc = NULL; 275 276 mtx_lock(&g_gate_units_lock); 277 if (unit >= 0 && unit < g_gate_maxunits) 278 sc = g_gate_units[unit]; 279 else if (unit == G_GATE_NAME_GIVEN) { 280 KASSERT(name != NULL, ("name is NULL")); 281 for (unit = 0; unit < g_gate_maxunits; unit++) { 282 if (g_gate_units[unit] == NULL) 283 continue; 284 if (strcmp(name, 285 g_gate_units[unit]->sc_provider->name) != 0) { 286 continue; 287 } 288 sc = g_gate_units[unit]; 289 break; 290 } 291 } 292 if (sc != NULL) 293 sc->sc_ref++; 294 mtx_unlock(&g_gate_units_lock); 295 return (sc); 296 } 297 298 static void 299 g_gate_release(struct g_gate_softc *sc) 300 { 301 302 g_topology_assert_not(); 303 mtx_lock(&g_gate_units_lock); 304 sc->sc_ref--; 305 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 306 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 307 wakeup(&sc->sc_ref); 308 mtx_unlock(&g_gate_units_lock); 309 } 310 311 static int 312 g_gate_getunit(int unit, int *errorp) 313 { 314 315 mtx_assert(&g_gate_units_lock, MA_OWNED); 316 if (unit >= 0) { 317 if (unit >= g_gate_maxunits) 318 *errorp = EINVAL; 319 else if (g_gate_units[unit] == NULL) 320 return (unit); 321 else 322 *errorp = EEXIST; 323 } else { 324 for (unit = 0; unit < g_gate_maxunits; unit++) { 325 if (g_gate_units[unit] == NULL) 326 return (unit); 327 } 328 *errorp = ENFILE; 329 } 330 return (-1); 331 } 332 333 static void 334 g_gate_guard(void *arg) 335 { 336 struct bio_queue_head queue; 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 bioq_init(&queue); 345 mtx_lock(&sc->sc_queue_mtx); 346 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 347 if (curtime.sec - bp->bio_t0.sec < 5) 348 continue; 349 bioq_remove(&sc->sc_inqueue, bp); 350 sc->sc_queue_count--; 351 bioq_insert_tail(&queue, bp); 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 bioq_insert_tail(&queue, bp); 359 } 360 mtx_unlock(&sc->sc_queue_mtx); 361 while ((bp = bioq_takefirst(&queue)) != NULL) { 362 G_GATE_LOGREQ(1, bp, "Request timeout."); 363 g_io_deliver(bp, EIO); 364 } 365 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 366 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 367 g_gate_guard, sc); 368 } 369 g_gate_release(sc); 370 } 371 372 static void 373 g_gate_orphan(struct g_consumer *cp) 374 { 375 struct g_gate_softc *sc; 376 struct g_geom *gp; 377 378 g_topology_assert(); 379 gp = cp->geom; 380 sc = gp->softc; 381 if (sc == NULL) 382 return; 383 KASSERT(cp == sc->sc_readcons, ("cp=%p sc_readcons=%p", cp, 384 sc->sc_readcons)); 385 sc->sc_readcons = NULL; 386 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.", 387 cp->provider->name); 388 (void)g_access(cp, -1, 0, 0); 389 g_detach(cp); 390 g_destroy_consumer(cp); 391 } 392 393 static void 394 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 395 struct g_consumer *cp, struct g_provider *pp) 396 { 397 struct g_gate_softc *sc; 398 399 sc = gp->softc; 400 if (sc == NULL || pp != NULL || cp != NULL) 401 return; 402 sc = g_gate_hold(sc->sc_unit, NULL); 403 if (sc == NULL) 404 return; 405 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 406 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 407 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 408 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 409 "write-only"); 410 } else { 411 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 412 "read-write"); 413 } 414 if (sc->sc_readcons != NULL) { 415 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n", 416 indent, (intmax_t)sc->sc_readoffset); 417 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n", 418 indent, sc->sc_readcons->provider->name); 419 } 420 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 421 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 422 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 423 sc->sc_queue_count); 424 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 425 sc->sc_queue_size); 426 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 427 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 428 g_topology_unlock(); 429 g_gate_release(sc); 430 g_topology_lock(); 431 } 432 433 static int 434 g_gate_create(struct g_gate_ctl_create *ggio) 435 { 436 struct g_gate_softc *sc; 437 struct g_geom *gp; 438 struct g_provider *pp, *ropp; 439 struct g_consumer *cp; 440 char name[NAME_MAX]; 441 int error = 0, unit; 442 443 if (ggio->gctl_mediasize <= 0) { 444 G_GATE_DEBUG(1, "Invalid media size."); 445 return (EINVAL); 446 } 447 if (ggio->gctl_sectorsize <= 0) { 448 G_GATE_DEBUG(1, "Invalid sector size."); 449 return (EINVAL); 450 } 451 if (!powerof2(ggio->gctl_sectorsize)) { 452 G_GATE_DEBUG(1, "Invalid sector size."); 453 return (EINVAL); 454 } 455 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 456 G_GATE_DEBUG(1, "Invalid media size."); 457 return (EINVAL); 458 } 459 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 460 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 461 G_GATE_DEBUG(1, "Invalid flags."); 462 return (EINVAL); 463 } 464 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 465 ggio->gctl_unit != G_GATE_NAME_GIVEN && 466 ggio->gctl_unit < 0) { 467 G_GATE_DEBUG(1, "Invalid unit number."); 468 return (EINVAL); 469 } 470 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 471 ggio->gctl_name[0] == '\0') { 472 G_GATE_DEBUG(1, "No device name."); 473 return (EINVAL); 474 } 475 476 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 477 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 478 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 479 sc->sc_seq = 1; 480 bioq_init(&sc->sc_inqueue); 481 bioq_init(&sc->sc_outqueue); 482 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 483 sc->sc_queue_count = 0; 484 sc->sc_queue_size = ggio->gctl_maxcount; 485 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 486 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 487 sc->sc_timeout = ggio->gctl_timeout; 488 callout_init(&sc->sc_callout, 1); 489 490 mtx_lock(&g_gate_units_lock); 491 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 492 if (sc->sc_unit < 0) 493 goto fail1; 494 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 495 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 496 else { 497 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 498 sc->sc_unit); 499 } 500 /* Check for name collision. */ 501 for (unit = 0; unit < g_gate_maxunits; unit++) { 502 if (g_gate_units[unit] == NULL) 503 continue; 504 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 505 continue; 506 error = EEXIST; 507 goto fail1; 508 } 509 sc->sc_name = name; 510 g_gate_units[sc->sc_unit] = sc; 511 g_gate_nunits++; 512 mtx_unlock(&g_gate_units_lock); 513 514 g_topology_lock(); 515 516 if (ggio->gctl_readprov[0] == '\0') { 517 ropp = NULL; 518 } else { 519 ropp = g_provider_by_name(ggio->gctl_readprov); 520 if (ropp == NULL) { 521 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 522 ggio->gctl_readprov); 523 error = EINVAL; 524 goto fail2; 525 } 526 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) { 527 G_GATE_DEBUG(1, "Invalid read offset."); 528 error = EINVAL; 529 goto fail2; 530 } 531 if (ggio->gctl_mediasize + ggio->gctl_readoffset > 532 ropp->mediasize) { 533 G_GATE_DEBUG(1, "Invalid read offset or media size."); 534 error = EINVAL; 535 goto fail2; 536 } 537 } 538 539 gp = g_new_geomf(&g_gate_class, "%s", name); 540 gp->start = g_gate_start; 541 gp->access = g_gate_access; 542 gp->orphan = g_gate_orphan; 543 gp->dumpconf = g_gate_dumpconf; 544 gp->softc = sc; 545 546 if (ropp != NULL) { 547 cp = g_new_consumer(gp); 548 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 549 error = g_attach(cp, ropp); 550 if (error != 0) { 551 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name); 552 goto fail3; 553 } 554 error = g_access(cp, 1, 0, 0); 555 if (error != 0) { 556 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name); 557 g_detach(cp); 558 goto fail3; 559 } 560 sc->sc_readcons = cp; 561 sc->sc_readoffset = ggio->gctl_readoffset; 562 } 563 564 ggio->gctl_unit = sc->sc_unit; 565 566 pp = g_new_providerf(gp, "%s", name); 567 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 568 pp->mediasize = ggio->gctl_mediasize; 569 pp->sectorsize = ggio->gctl_sectorsize; 570 sc->sc_provider = pp; 571 g_error_provider(pp, 0); 572 573 g_topology_unlock(); 574 mtx_lock(&g_gate_units_lock); 575 sc->sc_name = sc->sc_provider->name; 576 mtx_unlock(&g_gate_units_lock); 577 G_GATE_DEBUG(1, "Device %s created.", gp->name); 578 579 if (sc->sc_timeout > 0) { 580 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 581 g_gate_guard, sc); 582 } 583 return (0); 584 fail3: 585 g_destroy_consumer(cp); 586 g_destroy_geom(gp); 587 fail2: 588 g_topology_unlock(); 589 mtx_lock(&g_gate_units_lock); 590 g_gate_units[sc->sc_unit] = NULL; 591 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 592 g_gate_nunits--; 593 fail1: 594 mtx_unlock(&g_gate_units_lock); 595 mtx_destroy(&sc->sc_queue_mtx); 596 free(sc, M_GATE); 597 return (error); 598 } 599 600 static int 601 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio) 602 { 603 struct g_provider *pp; 604 struct g_consumer *cp; 605 int error; 606 607 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) { 608 if (ggio->gctl_mediasize <= 0) { 609 G_GATE_DEBUG(1, "Invalid media size."); 610 return (EINVAL); 611 } 612 pp = sc->sc_provider; 613 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) { 614 G_GATE_DEBUG(1, "Invalid media size."); 615 return (EINVAL); 616 } 617 /* TODO */ 618 return (EOPNOTSUPP); 619 } 620 621 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0) 622 (void)strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 623 624 cp = NULL; 625 626 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 627 g_topology_lock(); 628 if (sc->sc_readcons != NULL) { 629 cp = sc->sc_readcons; 630 sc->sc_readcons = NULL; 631 (void)g_access(cp, -1, 0, 0); 632 g_detach(cp); 633 g_destroy_consumer(cp); 634 } 635 if (ggio->gctl_readprov[0] != '\0') { 636 pp = g_provider_by_name(ggio->gctl_readprov); 637 if (pp == NULL) { 638 g_topology_unlock(); 639 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 640 ggio->gctl_readprov); 641 return (EINVAL); 642 } 643 cp = g_new_consumer(sc->sc_provider->geom); 644 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 645 error = g_attach(cp, pp); 646 if (error != 0) { 647 G_GATE_DEBUG(1, "Unable to attach to %s.", 648 pp->name); 649 } else { 650 error = g_access(cp, 1, 0, 0); 651 if (error != 0) { 652 G_GATE_DEBUG(1, "Unable to access %s.", 653 pp->name); 654 g_detach(cp); 655 } 656 } 657 if (error != 0) { 658 g_destroy_consumer(cp); 659 g_topology_unlock(); 660 return (error); 661 } 662 } 663 } else { 664 cp = sc->sc_readcons; 665 } 666 667 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) { 668 if (cp == NULL) { 669 G_GATE_DEBUG(1, "No read provider."); 670 return (EINVAL); 671 } 672 pp = sc->sc_provider; 673 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) { 674 G_GATE_DEBUG(1, "Invalid read offset."); 675 return (EINVAL); 676 } 677 if (pp->mediasize + ggio->gctl_readoffset > 678 cp->provider->mediasize) { 679 G_GATE_DEBUG(1, "Invalid read offset or media size."); 680 return (EINVAL); 681 } 682 sc->sc_readoffset = ggio->gctl_readoffset; 683 } 684 685 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 686 sc->sc_readcons = cp; 687 g_topology_unlock(); 688 } 689 690 return (0); 691 } 692 693 #define G_GATE_CHECK_VERSION(ggio) do { \ 694 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 695 printf("Version mismatch %d != %d.\n", \ 696 ggio->gctl_version, G_GATE_VERSION); \ 697 return (EINVAL); \ 698 } \ 699 } while (0) 700 static int 701 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 702 { 703 struct g_gate_softc *sc; 704 struct bio *bp; 705 int error = 0; 706 707 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 708 flags, td); 709 710 switch (cmd) { 711 case G_GATE_CMD_CREATE: 712 { 713 struct g_gate_ctl_create *ggio = (void *)addr; 714 715 G_GATE_CHECK_VERSION(ggio); 716 error = g_gate_create(ggio); 717 /* 718 * Reset TDP_GEOM flag. 719 * There are pending events for sure, because we just created 720 * new provider and other classes want to taste it, but we 721 * cannot answer on I/O requests until we're here. 722 */ 723 td->td_pflags &= ~TDP_GEOM; 724 return (error); 725 } 726 case G_GATE_CMD_MODIFY: 727 { 728 struct g_gate_ctl_modify *ggio = (void *)addr; 729 730 G_GATE_CHECK_VERSION(ggio); 731 sc = g_gate_hold(ggio->gctl_unit, NULL); 732 if (sc == NULL) 733 return (ENXIO); 734 error = g_gate_modify(sc, ggio); 735 g_gate_release(sc); 736 return (error); 737 } 738 case G_GATE_CMD_DESTROY: 739 { 740 struct g_gate_ctl_destroy *ggio = (void *)addr; 741 742 G_GATE_CHECK_VERSION(ggio); 743 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 744 if (sc == NULL) 745 return (ENXIO); 746 g_topology_lock(); 747 mtx_lock(&g_gate_units_lock); 748 error = g_gate_destroy(sc, ggio->gctl_force); 749 g_topology_unlock(); 750 if (error != 0) 751 g_gate_release(sc); 752 return (error); 753 } 754 case G_GATE_CMD_CANCEL: 755 { 756 struct g_gate_ctl_cancel *ggio = (void *)addr; 757 struct bio *tbp, *lbp; 758 759 G_GATE_CHECK_VERSION(ggio); 760 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 761 if (sc == NULL) 762 return (ENXIO); 763 lbp = NULL; 764 mtx_lock(&sc->sc_queue_mtx); 765 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 766 if (ggio->gctl_seq == 0 || 767 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 768 G_GATE_LOGREQ(1, bp, "Request canceled."); 769 bioq_remove(&sc->sc_outqueue, bp); 770 /* 771 * Be sure to put requests back onto incoming 772 * queue in the proper order. 773 */ 774 if (lbp == NULL) 775 bioq_insert_head(&sc->sc_inqueue, bp); 776 else { 777 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 778 lbp, bp, bio_queue); 779 } 780 lbp = bp; 781 /* 782 * If only one request was canceled, leave now. 783 */ 784 if (ggio->gctl_seq != 0) 785 break; 786 } 787 } 788 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 789 ggio->gctl_unit = sc->sc_unit; 790 mtx_unlock(&sc->sc_queue_mtx); 791 g_gate_release(sc); 792 return (error); 793 } 794 case G_GATE_CMD_START: 795 { 796 struct g_gate_ctl_io *ggio = (void *)addr; 797 798 G_GATE_CHECK_VERSION(ggio); 799 sc = g_gate_hold(ggio->gctl_unit, NULL); 800 if (sc == NULL) 801 return (ENXIO); 802 error = 0; 803 for (;;) { 804 mtx_lock(&sc->sc_queue_mtx); 805 bp = bioq_first(&sc->sc_inqueue); 806 if (bp != NULL) 807 break; 808 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 809 ggio->gctl_error = ECANCELED; 810 mtx_unlock(&sc->sc_queue_mtx); 811 goto start_end; 812 } 813 if (msleep(sc, &sc->sc_queue_mtx, 814 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 815 ggio->gctl_error = ECANCELED; 816 goto start_end; 817 } 818 } 819 ggio->gctl_cmd = bp->bio_cmd; 820 if (bp->bio_cmd == BIO_WRITE && 821 bp->bio_length > ggio->gctl_length) { 822 mtx_unlock(&sc->sc_queue_mtx); 823 ggio->gctl_length = bp->bio_length; 824 ggio->gctl_error = ENOMEM; 825 goto start_end; 826 } 827 bioq_remove(&sc->sc_inqueue, bp); 828 bioq_insert_tail(&sc->sc_outqueue, bp); 829 mtx_unlock(&sc->sc_queue_mtx); 830 831 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 832 ggio->gctl_offset = bp->bio_offset; 833 ggio->gctl_length = bp->bio_length; 834 835 switch (bp->bio_cmd) { 836 case BIO_READ: 837 case BIO_DELETE: 838 case BIO_FLUSH: 839 break; 840 case BIO_WRITE: 841 error = copyout(bp->bio_data, ggio->gctl_data, 842 bp->bio_length); 843 if (error != 0) { 844 mtx_lock(&sc->sc_queue_mtx); 845 bioq_remove(&sc->sc_outqueue, bp); 846 bioq_insert_head(&sc->sc_inqueue, bp); 847 mtx_unlock(&sc->sc_queue_mtx); 848 goto start_end; 849 } 850 break; 851 } 852 start_end: 853 g_gate_release(sc); 854 return (error); 855 } 856 case G_GATE_CMD_DONE: 857 { 858 struct g_gate_ctl_io *ggio = (void *)addr; 859 860 G_GATE_CHECK_VERSION(ggio); 861 sc = g_gate_hold(ggio->gctl_unit, NULL); 862 if (sc == NULL) 863 return (ENOENT); 864 error = 0; 865 mtx_lock(&sc->sc_queue_mtx); 866 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 867 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 868 break; 869 } 870 if (bp != NULL) { 871 bioq_remove(&sc->sc_outqueue, bp); 872 sc->sc_queue_count--; 873 } 874 mtx_unlock(&sc->sc_queue_mtx); 875 if (bp == NULL) { 876 /* 877 * Request was probably canceled. 878 */ 879 goto done_end; 880 } 881 if (ggio->gctl_error == EAGAIN) { 882 bp->bio_error = 0; 883 G_GATE_LOGREQ(1, bp, "Request desisted."); 884 mtx_lock(&sc->sc_queue_mtx); 885 sc->sc_queue_count++; 886 bioq_insert_head(&sc->sc_inqueue, bp); 887 wakeup(sc); 888 mtx_unlock(&sc->sc_queue_mtx); 889 } else { 890 bp->bio_error = ggio->gctl_error; 891 if (bp->bio_error == 0) { 892 bp->bio_completed = bp->bio_length; 893 switch (bp->bio_cmd) { 894 case BIO_READ: 895 error = copyin(ggio->gctl_data, 896 bp->bio_data, bp->bio_length); 897 if (error != 0) 898 bp->bio_error = error; 899 break; 900 case BIO_DELETE: 901 case BIO_WRITE: 902 case BIO_FLUSH: 903 break; 904 } 905 } 906 G_GATE_LOGREQ(2, bp, "Request done."); 907 g_io_deliver(bp, bp->bio_error); 908 } 909 done_end: 910 g_gate_release(sc); 911 return (error); 912 } 913 } 914 return (ENOIOCTL); 915 } 916 917 static void 918 g_gate_device(void) 919 { 920 921 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 922 G_GATE_CTL_NAME); 923 } 924 925 static int 926 g_gate_modevent(module_t mod, int type, void *data) 927 { 928 int error = 0; 929 930 switch (type) { 931 case MOD_LOAD: 932 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 933 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 934 M_GATE, M_WAITOK | M_ZERO); 935 g_gate_nunits = 0; 936 g_gate_device(); 937 break; 938 case MOD_UNLOAD: 939 mtx_lock(&g_gate_units_lock); 940 if (g_gate_nunits > 0) { 941 mtx_unlock(&g_gate_units_lock); 942 error = EBUSY; 943 break; 944 } 945 mtx_unlock(&g_gate_units_lock); 946 mtx_destroy(&g_gate_units_lock); 947 if (status_dev != NULL) 948 destroy_dev(status_dev); 949 free(g_gate_units, M_GATE); 950 break; 951 default: 952 return (EOPNOTSUPP); 953 break; 954 } 955 956 return (error); 957 } 958 static moduledata_t g_gate_module = { 959 G_GATE_MOD_NAME, 960 g_gate_modevent, 961 NULL 962 }; 963 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 964 DECLARE_GEOM_CLASS(g_gate_class, g_gate);
Cache object: 7861e9b6e773f3d8ed37f608e0148ada
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