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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * Copyright (c) 2009-2010 The FreeBSD Foundation 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Pawel Jakub Dawidek 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD: releng/12.0/sys/geom/gate/g_gate.c 336237 2018-07-13 07:08:06Z trociny $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bio.h> 39 #include <sys/conf.h> 40 #include <sys/kernel.h> 41 #include <sys/kthread.h> 42 #include <sys/fcntl.h> 43 #include <sys/linker.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mutex.h> 47 #include <sys/proc.h> 48 #include <sys/limits.h> 49 #include <sys/queue.h> 50 #include <sys/sbuf.h> 51 #include <sys/sysctl.h> 52 #include <sys/signalvar.h> 53 #include <sys/time.h> 54 #include <machine/atomic.h> 55 56 #include <geom/geom.h> 57 #include <geom/gate/g_gate.h> 58 59 FEATURE(geom_gate, "GEOM Gate module"); 60 61 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 62 63 SYSCTL_DECL(_kern_geom); 64 static SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW, 0, 65 "GEOM_GATE configuration"); 66 static int g_gate_debug = 0; 67 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RWTUN, &g_gate_debug, 0, 68 "Debug level"); 69 static u_int g_gate_maxunits = 256; 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 bio_queue_head queue; 95 struct g_provider *pp; 96 struct g_consumer *cp; 97 struct g_geom *gp; 98 struct bio *bp; 99 100 g_topology_assert(); 101 mtx_assert(&g_gate_units_lock, MA_OWNED); 102 pp = sc->sc_provider; 103 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 104 mtx_unlock(&g_gate_units_lock); 105 return (EBUSY); 106 } 107 mtx_unlock(&g_gate_units_lock); 108 mtx_lock(&sc->sc_queue_mtx); 109 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 110 sc->sc_flags |= G_GATE_FLAG_DESTROY; 111 wakeup(sc); 112 mtx_unlock(&sc->sc_queue_mtx); 113 gp = pp->geom; 114 g_wither_provider(pp, ENXIO); 115 callout_drain(&sc->sc_callout); 116 bioq_init(&queue); 117 mtx_lock(&sc->sc_queue_mtx); 118 while ((bp = bioq_takefirst(&sc->sc_inqueue)) != NULL) { 119 sc->sc_queue_count--; 120 bioq_insert_tail(&queue, bp); 121 } 122 while ((bp = bioq_takefirst(&sc->sc_outqueue)) != NULL) { 123 sc->sc_queue_count--; 124 bioq_insert_tail(&queue, bp); 125 } 126 mtx_unlock(&sc->sc_queue_mtx); 127 g_topology_unlock(); 128 while ((bp = bioq_takefirst(&queue)) != NULL) { 129 G_GATE_LOGREQ(1, bp, "Request canceled."); 130 g_io_deliver(bp, ENXIO); 131 } 132 mtx_lock(&g_gate_units_lock); 133 /* One reference is ours. */ 134 sc->sc_ref--; 135 while (sc->sc_ref > 0) 136 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 137 g_gate_units[sc->sc_unit] = NULL; 138 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 139 g_gate_nunits--; 140 mtx_unlock(&g_gate_units_lock); 141 mtx_destroy(&sc->sc_queue_mtx); 142 g_topology_lock(); 143 if ((cp = sc->sc_readcons) != NULL) { 144 sc->sc_readcons = NULL; 145 (void)g_access(cp, -1, 0, 0); 146 g_detach(cp); 147 g_destroy_consumer(cp); 148 } 149 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name); 150 gp->softc = NULL; 151 g_wither_geom(gp, ENXIO); 152 sc->sc_provider = NULL; 153 free(sc, M_GATE); 154 return (0); 155 } 156 157 static int 158 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 159 { 160 struct g_gate_softc *sc; 161 162 if (dr <= 0 && dw <= 0 && de <= 0) 163 return (0); 164 sc = pp->geom->softc; 165 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 166 return (ENXIO); 167 /* XXX: Hack to allow read-only mounts. */ 168 #if 0 169 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 170 return (EPERM); 171 #endif 172 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 173 return (EPERM); 174 return (0); 175 } 176 177 static void 178 g_gate_queue_io(struct bio *bp) 179 { 180 struct g_gate_softc *sc; 181 182 sc = bp->bio_to->geom->softc; 183 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 184 g_io_deliver(bp, ENXIO); 185 return; 186 } 187 188 mtx_lock(&sc->sc_queue_mtx); 189 190 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 191 mtx_unlock(&sc->sc_queue_mtx); 192 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 193 g_io_deliver(bp, ENOMEM); 194 return; 195 } 196 197 bp->bio_driver1 = (void *)sc->sc_seq; 198 sc->sc_seq++; 199 sc->sc_queue_count++; 200 201 bioq_insert_tail(&sc->sc_inqueue, bp); 202 wakeup(sc); 203 204 mtx_unlock(&sc->sc_queue_mtx); 205 } 206 207 static void 208 g_gate_done(struct bio *cbp) 209 { 210 struct bio *pbp; 211 212 pbp = cbp->bio_parent; 213 if (cbp->bio_error == 0) { 214 pbp->bio_completed = cbp->bio_completed; 215 g_destroy_bio(cbp); 216 pbp->bio_inbed++; 217 g_io_deliver(pbp, 0); 218 } else { 219 /* If direct read failed, pass it through userland daemon. */ 220 g_destroy_bio(cbp); 221 pbp->bio_children--; 222 g_gate_queue_io(pbp); 223 } 224 } 225 226 static void 227 g_gate_start(struct bio *pbp) 228 { 229 struct g_gate_softc *sc; 230 231 sc = pbp->bio_to->geom->softc; 232 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 233 g_io_deliver(pbp, ENXIO); 234 return; 235 } 236 G_GATE_LOGREQ(2, pbp, "Request received."); 237 switch (pbp->bio_cmd) { 238 case BIO_READ: 239 if (sc->sc_readcons != NULL) { 240 struct bio *cbp; 241 242 cbp = g_clone_bio(pbp); 243 if (cbp == NULL) { 244 g_io_deliver(pbp, ENOMEM); 245 return; 246 } 247 cbp->bio_done = g_gate_done; 248 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset; 249 cbp->bio_to = sc->sc_readcons->provider; 250 g_io_request(cbp, sc->sc_readcons); 251 return; 252 } 253 break; 254 case BIO_DELETE: 255 case BIO_WRITE: 256 case BIO_FLUSH: 257 /* XXX: Hack to allow read-only mounts. */ 258 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 259 g_io_deliver(pbp, EPERM); 260 return; 261 } 262 break; 263 case BIO_GETATTR: 264 default: 265 G_GATE_LOGREQ(2, pbp, "Ignoring request."); 266 g_io_deliver(pbp, EOPNOTSUPP); 267 return; 268 } 269 270 g_gate_queue_io(pbp); 271 } 272 273 static struct g_gate_softc * 274 g_gate_hold(int unit, const char *name) 275 { 276 struct g_gate_softc *sc = NULL; 277 278 mtx_lock(&g_gate_units_lock); 279 if (unit >= 0 && unit < g_gate_maxunits) 280 sc = g_gate_units[unit]; 281 else if (unit == G_GATE_NAME_GIVEN) { 282 KASSERT(name != NULL, ("name is NULL")); 283 for (unit = 0; unit < g_gate_maxunits; unit++) { 284 if (g_gate_units[unit] == NULL) 285 continue; 286 if (strcmp(name, 287 g_gate_units[unit]->sc_provider->name) != 0) { 288 continue; 289 } 290 sc = g_gate_units[unit]; 291 break; 292 } 293 } 294 if (sc != NULL) 295 sc->sc_ref++; 296 mtx_unlock(&g_gate_units_lock); 297 return (sc); 298 } 299 300 static void 301 g_gate_release(struct g_gate_softc *sc) 302 { 303 304 g_topology_assert_not(); 305 mtx_lock(&g_gate_units_lock); 306 sc->sc_ref--; 307 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 308 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 309 wakeup(&sc->sc_ref); 310 mtx_unlock(&g_gate_units_lock); 311 } 312 313 static int 314 g_gate_getunit(int unit, int *errorp) 315 { 316 317 mtx_assert(&g_gate_units_lock, MA_OWNED); 318 if (unit >= 0) { 319 if (unit >= g_gate_maxunits) 320 *errorp = EINVAL; 321 else if (g_gate_units[unit] == NULL) 322 return (unit); 323 else 324 *errorp = EEXIST; 325 } else { 326 for (unit = 0; unit < g_gate_maxunits; unit++) { 327 if (g_gate_units[unit] == NULL) 328 return (unit); 329 } 330 *errorp = ENFILE; 331 } 332 return (-1); 333 } 334 335 static void 336 g_gate_guard(void *arg) 337 { 338 struct bio_queue_head queue; 339 struct g_gate_softc *sc; 340 struct bintime curtime; 341 struct bio *bp, *bp2; 342 343 sc = arg; 344 binuptime(&curtime); 345 g_gate_hold(sc->sc_unit, NULL); 346 bioq_init(&queue); 347 mtx_lock(&sc->sc_queue_mtx); 348 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 349 if (curtime.sec - bp->bio_t0.sec < 5) 350 continue; 351 bioq_remove(&sc->sc_inqueue, bp); 352 sc->sc_queue_count--; 353 bioq_insert_tail(&queue, bp); 354 } 355 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 356 if (curtime.sec - bp->bio_t0.sec < 5) 357 continue; 358 bioq_remove(&sc->sc_outqueue, bp); 359 sc->sc_queue_count--; 360 bioq_insert_tail(&queue, bp); 361 } 362 mtx_unlock(&sc->sc_queue_mtx); 363 while ((bp = bioq_takefirst(&queue)) != NULL) { 364 G_GATE_LOGREQ(1, bp, "Request timeout."); 365 g_io_deliver(bp, EIO); 366 } 367 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 368 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 369 g_gate_guard, sc); 370 } 371 g_gate_release(sc); 372 } 373 374 static void 375 g_gate_orphan(struct g_consumer *cp) 376 { 377 struct g_gate_softc *sc; 378 struct g_geom *gp; 379 380 g_topology_assert(); 381 gp = cp->geom; 382 sc = gp->softc; 383 if (sc == NULL) 384 return; 385 KASSERT(cp == sc->sc_readcons, ("cp=%p sc_readcons=%p", cp, 386 sc->sc_readcons)); 387 sc->sc_readcons = NULL; 388 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.", 389 cp->provider->name); 390 (void)g_access(cp, -1, 0, 0); 391 g_detach(cp); 392 g_destroy_consumer(cp); 393 } 394 395 static void 396 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 397 struct g_consumer *cp, struct g_provider *pp) 398 { 399 struct g_gate_softc *sc; 400 401 sc = gp->softc; 402 if (sc == NULL || pp != NULL || cp != NULL) 403 return; 404 sc = g_gate_hold(sc->sc_unit, NULL); 405 if (sc == NULL) 406 return; 407 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 408 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 409 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 410 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 411 "write-only"); 412 } else { 413 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 414 "read-write"); 415 } 416 if (sc->sc_readcons != NULL) { 417 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n", 418 indent, (intmax_t)sc->sc_readoffset); 419 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n", 420 indent, sc->sc_readcons->provider->name); 421 } 422 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 423 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 424 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 425 sc->sc_queue_count); 426 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 427 sc->sc_queue_size); 428 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 429 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 430 g_topology_unlock(); 431 g_gate_release(sc); 432 g_topology_lock(); 433 } 434 435 static int 436 g_gate_create(struct g_gate_ctl_create *ggio) 437 { 438 struct g_gate_softc *sc; 439 struct g_geom *gp; 440 struct g_provider *pp, *ropp; 441 struct g_consumer *cp; 442 char name[NAME_MAX]; 443 int error = 0, unit; 444 445 if (ggio->gctl_mediasize <= 0) { 446 G_GATE_DEBUG(1, "Invalid media size."); 447 return (EINVAL); 448 } 449 if (ggio->gctl_sectorsize <= 0) { 450 G_GATE_DEBUG(1, "Invalid sector size."); 451 return (EINVAL); 452 } 453 if (!powerof2(ggio->gctl_sectorsize)) { 454 G_GATE_DEBUG(1, "Invalid sector size."); 455 return (EINVAL); 456 } 457 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 458 G_GATE_DEBUG(1, "Invalid media size."); 459 return (EINVAL); 460 } 461 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 462 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 463 G_GATE_DEBUG(1, "Invalid flags."); 464 return (EINVAL); 465 } 466 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 467 ggio->gctl_unit != G_GATE_NAME_GIVEN && 468 ggio->gctl_unit < 0) { 469 G_GATE_DEBUG(1, "Invalid unit number."); 470 return (EINVAL); 471 } 472 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 473 ggio->gctl_name[0] == '\0') { 474 G_GATE_DEBUG(1, "No device name."); 475 return (EINVAL); 476 } 477 478 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 479 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 480 strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 481 sc->sc_seq = 1; 482 bioq_init(&sc->sc_inqueue); 483 bioq_init(&sc->sc_outqueue); 484 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 485 sc->sc_queue_count = 0; 486 sc->sc_queue_size = ggio->gctl_maxcount; 487 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 488 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 489 sc->sc_timeout = ggio->gctl_timeout; 490 callout_init(&sc->sc_callout, 1); 491 492 mtx_lock(&g_gate_units_lock); 493 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 494 if (sc->sc_unit < 0) 495 goto fail1; 496 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 497 snprintf(name, sizeof(name), "%s", ggio->gctl_name); 498 else { 499 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 500 sc->sc_unit); 501 } 502 /* Check for name collision. */ 503 for (unit = 0; unit < g_gate_maxunits; unit++) { 504 if (g_gate_units[unit] == NULL) 505 continue; 506 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 507 continue; 508 error = EEXIST; 509 goto fail1; 510 } 511 sc->sc_name = name; 512 g_gate_units[sc->sc_unit] = sc; 513 g_gate_nunits++; 514 mtx_unlock(&g_gate_units_lock); 515 516 g_topology_lock(); 517 518 if (ggio->gctl_readprov[0] == '\0') { 519 ropp = NULL; 520 } else { 521 ropp = g_provider_by_name(ggio->gctl_readprov); 522 if (ropp == NULL) { 523 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 524 ggio->gctl_readprov); 525 error = EINVAL; 526 goto fail2; 527 } 528 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) { 529 G_GATE_DEBUG(1, "Invalid read offset."); 530 error = EINVAL; 531 goto fail2; 532 } 533 if (ggio->gctl_mediasize + ggio->gctl_readoffset > 534 ropp->mediasize) { 535 G_GATE_DEBUG(1, "Invalid read offset or media size."); 536 error = EINVAL; 537 goto fail2; 538 } 539 } 540 541 gp = g_new_geomf(&g_gate_class, "%s", name); 542 gp->start = g_gate_start; 543 gp->access = g_gate_access; 544 gp->orphan = g_gate_orphan; 545 gp->dumpconf = g_gate_dumpconf; 546 gp->softc = sc; 547 548 if (ropp != NULL) { 549 cp = g_new_consumer(gp); 550 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 551 error = g_attach(cp, ropp); 552 if (error != 0) { 553 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name); 554 goto fail3; 555 } 556 error = g_access(cp, 1, 0, 0); 557 if (error != 0) { 558 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name); 559 g_detach(cp); 560 goto fail3; 561 } 562 sc->sc_readcons = cp; 563 sc->sc_readoffset = ggio->gctl_readoffset; 564 } 565 566 ggio->gctl_unit = sc->sc_unit; 567 568 pp = g_new_providerf(gp, "%s", name); 569 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 570 pp->mediasize = ggio->gctl_mediasize; 571 pp->sectorsize = ggio->gctl_sectorsize; 572 sc->sc_provider = pp; 573 g_error_provider(pp, 0); 574 575 g_topology_unlock(); 576 mtx_lock(&g_gate_units_lock); 577 sc->sc_name = sc->sc_provider->name; 578 mtx_unlock(&g_gate_units_lock); 579 G_GATE_DEBUG(1, "Device %s created.", gp->name); 580 581 if (sc->sc_timeout > 0) { 582 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 583 g_gate_guard, sc); 584 } 585 return (0); 586 fail3: 587 g_destroy_consumer(cp); 588 g_destroy_geom(gp); 589 fail2: 590 g_topology_unlock(); 591 mtx_lock(&g_gate_units_lock); 592 g_gate_units[sc->sc_unit] = NULL; 593 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 594 g_gate_nunits--; 595 fail1: 596 mtx_unlock(&g_gate_units_lock); 597 mtx_destroy(&sc->sc_queue_mtx); 598 free(sc, M_GATE); 599 return (error); 600 } 601 602 static int 603 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio) 604 { 605 struct g_provider *pp; 606 struct g_consumer *cp; 607 int error; 608 609 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) { 610 if (ggio->gctl_mediasize <= 0) { 611 G_GATE_DEBUG(1, "Invalid media size."); 612 return (EINVAL); 613 } 614 pp = sc->sc_provider; 615 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) { 616 G_GATE_DEBUG(1, "Invalid media size."); 617 return (EINVAL); 618 } 619 g_resize_provider(pp, ggio->gctl_mediasize); 620 return (0); 621 } 622 623 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0) 624 (void)strlcpy(sc->sc_info, ggio->gctl_info, sizeof(sc->sc_info)); 625 626 cp = NULL; 627 628 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 629 g_topology_lock(); 630 if (sc->sc_readcons != NULL) { 631 cp = sc->sc_readcons; 632 sc->sc_readcons = NULL; 633 (void)g_access(cp, -1, 0, 0); 634 g_detach(cp); 635 g_destroy_consumer(cp); 636 } 637 if (ggio->gctl_readprov[0] != '\0') { 638 pp = g_provider_by_name(ggio->gctl_readprov); 639 if (pp == NULL) { 640 g_topology_unlock(); 641 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 642 ggio->gctl_readprov); 643 return (EINVAL); 644 } 645 cp = g_new_consumer(sc->sc_provider->geom); 646 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 647 error = g_attach(cp, pp); 648 if (error != 0) { 649 G_GATE_DEBUG(1, "Unable to attach to %s.", 650 pp->name); 651 } else { 652 error = g_access(cp, 1, 0, 0); 653 if (error != 0) { 654 G_GATE_DEBUG(1, "Unable to access %s.", 655 pp->name); 656 g_detach(cp); 657 } 658 } 659 if (error != 0) { 660 g_destroy_consumer(cp); 661 g_topology_unlock(); 662 return (error); 663 } 664 } 665 } else { 666 cp = sc->sc_readcons; 667 } 668 669 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) { 670 if (cp == NULL) { 671 G_GATE_DEBUG(1, "No read provider."); 672 return (EINVAL); 673 } 674 pp = sc->sc_provider; 675 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) { 676 G_GATE_DEBUG(1, "Invalid read offset."); 677 return (EINVAL); 678 } 679 if (pp->mediasize + ggio->gctl_readoffset > 680 cp->provider->mediasize) { 681 G_GATE_DEBUG(1, "Invalid read offset or media size."); 682 return (EINVAL); 683 } 684 sc->sc_readoffset = ggio->gctl_readoffset; 685 } 686 687 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 688 sc->sc_readcons = cp; 689 g_topology_unlock(); 690 } 691 692 return (0); 693 } 694 695 #define G_GATE_CHECK_VERSION(ggio) do { \ 696 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 697 printf("Version mismatch %d != %d.\n", \ 698 ggio->gctl_version, G_GATE_VERSION); \ 699 return (EINVAL); \ 700 } \ 701 } while (0) 702 static int 703 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 704 { 705 struct g_gate_softc *sc; 706 struct bio *bp; 707 int error = 0; 708 709 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 710 flags, td); 711 712 switch (cmd) { 713 case G_GATE_CMD_CREATE: 714 { 715 struct g_gate_ctl_create *ggio = (void *)addr; 716 717 G_GATE_CHECK_VERSION(ggio); 718 error = g_gate_create(ggio); 719 /* 720 * Reset TDP_GEOM flag. 721 * There are pending events for sure, because we just created 722 * new provider and other classes want to taste it, but we 723 * cannot answer on I/O requests until we're here. 724 */ 725 td->td_pflags &= ~TDP_GEOM; 726 return (error); 727 } 728 case G_GATE_CMD_MODIFY: 729 { 730 struct g_gate_ctl_modify *ggio = (void *)addr; 731 732 G_GATE_CHECK_VERSION(ggio); 733 sc = g_gate_hold(ggio->gctl_unit, NULL); 734 if (sc == NULL) 735 return (ENXIO); 736 error = g_gate_modify(sc, ggio); 737 g_gate_release(sc); 738 return (error); 739 } 740 case G_GATE_CMD_DESTROY: 741 { 742 struct g_gate_ctl_destroy *ggio = (void *)addr; 743 744 G_GATE_CHECK_VERSION(ggio); 745 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 746 if (sc == NULL) 747 return (ENXIO); 748 g_topology_lock(); 749 mtx_lock(&g_gate_units_lock); 750 error = g_gate_destroy(sc, ggio->gctl_force); 751 g_topology_unlock(); 752 if (error != 0) 753 g_gate_release(sc); 754 return (error); 755 } 756 case G_GATE_CMD_CANCEL: 757 { 758 struct g_gate_ctl_cancel *ggio = (void *)addr; 759 struct bio *tbp, *lbp; 760 761 G_GATE_CHECK_VERSION(ggio); 762 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 763 if (sc == NULL) 764 return (ENXIO); 765 lbp = NULL; 766 mtx_lock(&sc->sc_queue_mtx); 767 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 768 if (ggio->gctl_seq == 0 || 769 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 770 G_GATE_LOGREQ(1, bp, "Request canceled."); 771 bioq_remove(&sc->sc_outqueue, bp); 772 /* 773 * Be sure to put requests back onto incoming 774 * queue in the proper order. 775 */ 776 if (lbp == NULL) 777 bioq_insert_head(&sc->sc_inqueue, bp); 778 else { 779 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 780 lbp, bp, bio_queue); 781 } 782 lbp = bp; 783 /* 784 * If only one request was canceled, leave now. 785 */ 786 if (ggio->gctl_seq != 0) 787 break; 788 } 789 } 790 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 791 ggio->gctl_unit = sc->sc_unit; 792 mtx_unlock(&sc->sc_queue_mtx); 793 g_gate_release(sc); 794 return (error); 795 } 796 case G_GATE_CMD_START: 797 { 798 struct g_gate_ctl_io *ggio = (void *)addr; 799 800 G_GATE_CHECK_VERSION(ggio); 801 sc = g_gate_hold(ggio->gctl_unit, NULL); 802 if (sc == NULL) 803 return (ENXIO); 804 error = 0; 805 for (;;) { 806 mtx_lock(&sc->sc_queue_mtx); 807 bp = bioq_first(&sc->sc_inqueue); 808 if (bp != NULL) 809 break; 810 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 811 ggio->gctl_error = ECANCELED; 812 mtx_unlock(&sc->sc_queue_mtx); 813 goto start_end; 814 } 815 if (msleep(sc, &sc->sc_queue_mtx, 816 PPAUSE | PDROP | PCATCH, "ggwait", 0) != 0) { 817 ggio->gctl_error = ECANCELED; 818 goto start_end; 819 } 820 } 821 ggio->gctl_cmd = bp->bio_cmd; 822 if (bp->bio_cmd == BIO_WRITE && 823 bp->bio_length > ggio->gctl_length) { 824 mtx_unlock(&sc->sc_queue_mtx); 825 ggio->gctl_length = bp->bio_length; 826 ggio->gctl_error = ENOMEM; 827 goto start_end; 828 } 829 bioq_remove(&sc->sc_inqueue, bp); 830 bioq_insert_tail(&sc->sc_outqueue, bp); 831 mtx_unlock(&sc->sc_queue_mtx); 832 833 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 834 ggio->gctl_offset = bp->bio_offset; 835 ggio->gctl_length = bp->bio_length; 836 837 switch (bp->bio_cmd) { 838 case BIO_READ: 839 case BIO_DELETE: 840 case BIO_FLUSH: 841 break; 842 case BIO_WRITE: 843 error = copyout(bp->bio_data, ggio->gctl_data, 844 bp->bio_length); 845 if (error != 0) { 846 mtx_lock(&sc->sc_queue_mtx); 847 bioq_remove(&sc->sc_outqueue, bp); 848 bioq_insert_head(&sc->sc_inqueue, bp); 849 mtx_unlock(&sc->sc_queue_mtx); 850 goto start_end; 851 } 852 break; 853 } 854 start_end: 855 g_gate_release(sc); 856 return (error); 857 } 858 case G_GATE_CMD_DONE: 859 { 860 struct g_gate_ctl_io *ggio = (void *)addr; 861 862 G_GATE_CHECK_VERSION(ggio); 863 sc = g_gate_hold(ggio->gctl_unit, NULL); 864 if (sc == NULL) 865 return (ENOENT); 866 error = 0; 867 mtx_lock(&sc->sc_queue_mtx); 868 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 869 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 870 break; 871 } 872 if (bp != NULL) { 873 bioq_remove(&sc->sc_outqueue, bp); 874 sc->sc_queue_count--; 875 } 876 mtx_unlock(&sc->sc_queue_mtx); 877 if (bp == NULL) { 878 /* 879 * Request was probably canceled. 880 */ 881 goto done_end; 882 } 883 if (ggio->gctl_error == EAGAIN) { 884 bp->bio_error = 0; 885 G_GATE_LOGREQ(1, bp, "Request desisted."); 886 mtx_lock(&sc->sc_queue_mtx); 887 sc->sc_queue_count++; 888 bioq_insert_head(&sc->sc_inqueue, bp); 889 wakeup(sc); 890 mtx_unlock(&sc->sc_queue_mtx); 891 } else { 892 bp->bio_error = ggio->gctl_error; 893 if (bp->bio_error == 0) { 894 bp->bio_completed = bp->bio_length; 895 switch (bp->bio_cmd) { 896 case BIO_READ: 897 error = copyin(ggio->gctl_data, 898 bp->bio_data, bp->bio_length); 899 if (error != 0) 900 bp->bio_error = error; 901 break; 902 case BIO_DELETE: 903 case BIO_WRITE: 904 case BIO_FLUSH: 905 break; 906 } 907 } 908 G_GATE_LOGREQ(2, bp, "Request done."); 909 g_io_deliver(bp, bp->bio_error); 910 } 911 done_end: 912 g_gate_release(sc); 913 return (error); 914 } 915 } 916 return (ENOIOCTL); 917 } 918 919 static void 920 g_gate_device(void) 921 { 922 923 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 924 G_GATE_CTL_NAME); 925 } 926 927 static int 928 g_gate_modevent(module_t mod, int type, void *data) 929 { 930 int error = 0; 931 932 switch (type) { 933 case MOD_LOAD: 934 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 935 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 936 M_GATE, M_WAITOK | M_ZERO); 937 g_gate_nunits = 0; 938 g_gate_device(); 939 break; 940 case MOD_UNLOAD: 941 mtx_lock(&g_gate_units_lock); 942 if (g_gate_nunits > 0) { 943 mtx_unlock(&g_gate_units_lock); 944 error = EBUSY; 945 break; 946 } 947 mtx_unlock(&g_gate_units_lock); 948 mtx_destroy(&g_gate_units_lock); 949 if (status_dev != NULL) 950 destroy_dev(status_dev); 951 free(g_gate_units, M_GATE); 952 break; 953 default: 954 return (EOPNOTSUPP); 955 break; 956 } 957 958 return (error); 959 } 960 static moduledata_t g_gate_module = { 961 G_GATE_MOD_NAME, 962 g_gate_modevent, 963 NULL 964 }; 965 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 966 DECLARE_GEOM_CLASS(g_gate_class, g_gate); 967 MODULE_VERSION(geom_gate, 0);
Cache object: e2068c6fbd52a7607aa377995aa768b1
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