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 * 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("$FreeBSD$"); 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/geom_dbg.h> 58 #include <geom/gate/g_gate.h> 59 60 FEATURE(geom_gate, "GEOM Gate module"); 61 62 static MALLOC_DEFINE(M_GATE, "gg_data", "GEOM Gate Data"); 63 64 SYSCTL_DECL(_kern_geom); 65 static SYSCTL_NODE(_kern_geom, OID_AUTO, gate, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 66 "GEOM_GATE configuration"); 67 static int g_gate_debug = 0; 68 SYSCTL_INT(_kern_geom_gate, OID_AUTO, debug, CTLFLAG_RWTUN, &g_gate_debug, 0, 69 "Debug level"); 70 static u_int g_gate_maxunits = 256; 71 SYSCTL_UINT(_kern_geom_gate, OID_AUTO, maxunits, CTLFLAG_RDTUN, 72 &g_gate_maxunits, 0, "Maximum number of ggate devices"); 73 74 struct g_class g_gate_class = { 75 .name = G_GATE_CLASS_NAME, 76 .version = G_VERSION, 77 }; 78 79 static struct cdev *status_dev; 80 static d_ioctl_t g_gate_ioctl; 81 static struct cdevsw g_gate_cdevsw = { 82 .d_version = D_VERSION, 83 .d_ioctl = g_gate_ioctl, 84 .d_name = G_GATE_CTL_NAME 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 void 92 g_gate_detach(void *arg, int flags __unused) 93 { 94 struct g_consumer *cp = arg; 95 96 g_topology_assert(); 97 G_GATE_DEBUG(1, "Destroying read consumer on provider %s orphan.", 98 cp->provider->name); 99 (void)g_access(cp, -1, 0, 0); 100 g_detach(cp); 101 g_destroy_consumer(cp); 102 } 103 104 static int 105 g_gate_destroy(struct g_gate_softc *sc, boolean_t force) 106 { 107 struct bio_queue_head queue; 108 struct g_provider *pp; 109 struct g_consumer *cp; 110 struct g_geom *gp; 111 struct bio *bp; 112 113 g_topology_assert(); 114 mtx_assert(&g_gate_units_lock, MA_OWNED); 115 pp = sc->sc_provider; 116 if (!force && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 117 mtx_unlock(&g_gate_units_lock); 118 return (EBUSY); 119 } 120 mtx_unlock(&g_gate_units_lock); 121 mtx_lock(&sc->sc_queue_mtx); 122 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) 123 sc->sc_flags |= G_GATE_FLAG_DESTROY; 124 wakeup(sc); 125 mtx_unlock(&sc->sc_queue_mtx); 126 gp = pp->geom; 127 g_wither_provider(pp, ENXIO); 128 callout_drain(&sc->sc_callout); 129 bioq_init(&queue); 130 mtx_lock(&sc->sc_queue_mtx); 131 while ((bp = bioq_takefirst(&sc->sc_inqueue)) != NULL) { 132 sc->sc_queue_count--; 133 bioq_insert_tail(&queue, bp); 134 } 135 while ((bp = bioq_takefirst(&sc->sc_outqueue)) != NULL) { 136 sc->sc_queue_count--; 137 bioq_insert_tail(&queue, bp); 138 } 139 mtx_unlock(&sc->sc_queue_mtx); 140 g_topology_unlock(); 141 while ((bp = bioq_takefirst(&queue)) != NULL) { 142 G_GATE_LOGREQ(1, bp, "Request canceled."); 143 g_io_deliver(bp, ENXIO); 144 } 145 mtx_lock(&g_gate_units_lock); 146 /* One reference is ours. */ 147 sc->sc_ref--; 148 while (sc->sc_ref > 0) 149 msleep(&sc->sc_ref, &g_gate_units_lock, 0, "gg:destroy", 0); 150 g_gate_units[sc->sc_unit] = NULL; 151 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 152 g_gate_nunits--; 153 mtx_unlock(&g_gate_units_lock); 154 mtx_destroy(&sc->sc_queue_mtx); 155 mtx_destroy(&sc->sc_read_mtx); 156 g_topology_lock(); 157 if ((cp = sc->sc_readcons) != NULL) { 158 sc->sc_readcons = NULL; 159 (void)g_access(cp, -1, 0, 0); 160 g_detach(cp); 161 g_destroy_consumer(cp); 162 } 163 G_GATE_DEBUG(1, "Device %s destroyed.", gp->name); 164 gp->softc = NULL; 165 g_wither_geom(gp, ENXIO); 166 sc->sc_provider = NULL; 167 free(sc, M_GATE); 168 return (0); 169 } 170 171 static int 172 g_gate_access(struct g_provider *pp, int dr, int dw, int de) 173 { 174 struct g_gate_softc *sc; 175 176 if (dr <= 0 && dw <= 0 && de <= 0) 177 return (0); 178 sc = pp->geom->softc; 179 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 180 return (ENXIO); 181 /* XXX: Hack to allow read-only mounts. */ 182 #if 0 183 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0 && dw > 0) 184 return (EPERM); 185 #endif 186 if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0 && dr > 0) 187 return (EPERM); 188 return (0); 189 } 190 191 static void 192 g_gate_queue_io(struct bio *bp) 193 { 194 struct g_gate_softc *sc; 195 196 sc = bp->bio_to->geom->softc; 197 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 198 g_io_deliver(bp, ENXIO); 199 return; 200 } 201 202 mtx_lock(&sc->sc_queue_mtx); 203 204 if (sc->sc_queue_size > 0 && sc->sc_queue_count > sc->sc_queue_size) { 205 mtx_unlock(&sc->sc_queue_mtx); 206 G_GATE_LOGREQ(1, bp, "Queue full, request canceled."); 207 g_io_deliver(bp, ENOMEM); 208 return; 209 } 210 211 bp->bio_driver1 = (void *)sc->sc_seq; 212 sc->sc_seq++; 213 sc->sc_queue_count++; 214 215 bioq_insert_tail(&sc->sc_inqueue, bp); 216 wakeup(sc); 217 218 mtx_unlock(&sc->sc_queue_mtx); 219 } 220 221 static void 222 g_gate_done(struct bio *cbp) 223 { 224 struct g_gate_softc *sc; 225 struct bio *pbp; 226 struct g_consumer *cp; 227 228 cp = cbp->bio_from; 229 pbp = cbp->bio_parent; 230 if (cbp->bio_error == 0) { 231 pbp->bio_completed = cbp->bio_completed; 232 g_destroy_bio(cbp); 233 pbp->bio_inbed++; 234 g_io_deliver(pbp, 0); 235 } else { 236 /* If direct read failed, pass it through userland daemon. */ 237 g_destroy_bio(cbp); 238 pbp->bio_children--; 239 g_gate_queue_io(pbp); 240 } 241 242 sc = cp->geom->softc; 243 mtx_lock(&sc->sc_read_mtx); 244 if (--cp->index == 0 && sc->sc_readcons != cp) 245 g_post_event(g_gate_detach, cp, M_NOWAIT, NULL); 246 mtx_unlock(&sc->sc_read_mtx); 247 } 248 249 static void 250 g_gate_start(struct bio *pbp) 251 { 252 struct g_gate_softc *sc; 253 struct g_consumer *cp; 254 struct bio *cbp; 255 256 sc = pbp->bio_to->geom->softc; 257 if (sc == NULL || (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 258 g_io_deliver(pbp, ENXIO); 259 return; 260 } 261 G_GATE_LOGREQ(2, pbp, "Request received."); 262 switch (pbp->bio_cmd) { 263 case BIO_READ: 264 if (sc->sc_readcons == NULL) 265 break; 266 cbp = g_clone_bio(pbp); 267 if (cbp == NULL) { 268 g_io_deliver(pbp, ENOMEM); 269 return; 270 } 271 mtx_lock(&sc->sc_read_mtx); 272 if ((cp = sc->sc_readcons) == NULL) { 273 mtx_unlock(&sc->sc_read_mtx); 274 g_destroy_bio(cbp); 275 pbp->bio_children--; 276 break; 277 } 278 cp->index++; 279 cbp->bio_offset = pbp->bio_offset + sc->sc_readoffset; 280 mtx_unlock(&sc->sc_read_mtx); 281 cbp->bio_done = g_gate_done; 282 g_io_request(cbp, cp); 283 return; 284 case BIO_DELETE: 285 case BIO_WRITE: 286 case BIO_FLUSH: 287 case BIO_SPEEDUP: 288 /* XXX: Hack to allow read-only mounts. */ 289 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 290 g_io_deliver(pbp, EPERM); 291 return; 292 } 293 break; 294 case BIO_GETATTR: 295 default: 296 G_GATE_LOGREQ(2, pbp, "Ignoring request."); 297 g_io_deliver(pbp, EOPNOTSUPP); 298 return; 299 } 300 301 g_gate_queue_io(pbp); 302 } 303 304 static struct g_gate_softc * 305 g_gate_hold(int unit, const char *name) 306 { 307 struct g_gate_softc *sc = NULL; 308 309 mtx_lock(&g_gate_units_lock); 310 if (unit >= 0 && unit < g_gate_maxunits) 311 sc = g_gate_units[unit]; 312 else if (unit == G_GATE_NAME_GIVEN) { 313 KASSERT(name != NULL, ("name is NULL")); 314 for (unit = 0; unit < g_gate_maxunits; unit++) { 315 if (g_gate_units[unit] == NULL) 316 continue; 317 if (strcmp(name, 318 g_gate_units[unit]->sc_provider->name) != 0) { 319 continue; 320 } 321 sc = g_gate_units[unit]; 322 break; 323 } 324 } 325 if (sc != NULL) 326 sc->sc_ref++; 327 mtx_unlock(&g_gate_units_lock); 328 return (sc); 329 } 330 331 static void 332 g_gate_release(struct g_gate_softc *sc) 333 { 334 335 g_topology_assert_not(); 336 mtx_lock(&g_gate_units_lock); 337 sc->sc_ref--; 338 KASSERT(sc->sc_ref >= 0, ("Negative sc_ref for %s.", sc->sc_name)); 339 if (sc->sc_ref == 0 && (sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) 340 wakeup(&sc->sc_ref); 341 mtx_unlock(&g_gate_units_lock); 342 } 343 344 static int 345 g_gate_getunit(int unit, int *errorp) 346 { 347 348 mtx_assert(&g_gate_units_lock, MA_OWNED); 349 if (unit >= 0) { 350 if (unit >= g_gate_maxunits) 351 *errorp = EINVAL; 352 else if (g_gate_units[unit] == NULL) 353 return (unit); 354 else 355 *errorp = EEXIST; 356 } else { 357 for (unit = 0; unit < g_gate_maxunits; unit++) { 358 if (g_gate_units[unit] == NULL) 359 return (unit); 360 } 361 *errorp = ENFILE; 362 } 363 return (-1); 364 } 365 366 static void 367 g_gate_guard(void *arg) 368 { 369 struct bio_queue_head queue; 370 struct g_gate_softc *sc; 371 struct bintime curtime; 372 struct bio *bp, *bp2; 373 374 sc = arg; 375 binuptime(&curtime); 376 g_gate_hold(sc->sc_unit, NULL); 377 bioq_init(&queue); 378 mtx_lock(&sc->sc_queue_mtx); 379 TAILQ_FOREACH_SAFE(bp, &sc->sc_inqueue.queue, bio_queue, bp2) { 380 if (curtime.sec - bp->bio_t0.sec < 5) 381 continue; 382 bioq_remove(&sc->sc_inqueue, bp); 383 sc->sc_queue_count--; 384 bioq_insert_tail(&queue, bp); 385 } 386 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, bp2) { 387 if (curtime.sec - bp->bio_t0.sec < 5) 388 continue; 389 bioq_remove(&sc->sc_outqueue, bp); 390 sc->sc_queue_count--; 391 bioq_insert_tail(&queue, bp); 392 } 393 mtx_unlock(&sc->sc_queue_mtx); 394 while ((bp = bioq_takefirst(&queue)) != NULL) { 395 G_GATE_LOGREQ(1, bp, "Request timeout."); 396 g_io_deliver(bp, EIO); 397 } 398 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) == 0) { 399 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 400 g_gate_guard, sc); 401 } 402 g_gate_release(sc); 403 } 404 405 static void 406 g_gate_orphan(struct g_consumer *cp) 407 { 408 struct g_gate_softc *sc; 409 struct g_geom *gp; 410 int done; 411 412 g_topology_assert(); 413 gp = cp->geom; 414 sc = gp->softc; 415 mtx_lock(&sc->sc_read_mtx); 416 if (sc->sc_readcons == cp) 417 sc->sc_readcons = NULL; 418 done = (cp->index == 0); 419 mtx_unlock(&sc->sc_read_mtx); 420 if (done) 421 g_gate_detach(cp, 0); 422 } 423 424 static void 425 g_gate_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 426 struct g_consumer *cp, struct g_provider *pp) 427 { 428 struct g_gate_softc *sc; 429 430 sc = gp->softc; 431 if (sc == NULL || pp != NULL || cp != NULL) 432 return; 433 sc = g_gate_hold(sc->sc_unit, NULL); 434 if (sc == NULL) 435 return; 436 if ((sc->sc_flags & G_GATE_FLAG_READONLY) != 0) { 437 sbuf_printf(sb, "%s<access>%s</access>\n", indent, "read-only"); 438 } else if ((sc->sc_flags & G_GATE_FLAG_WRITEONLY) != 0) { 439 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 440 "write-only"); 441 } else { 442 sbuf_printf(sb, "%s<access>%s</access>\n", indent, 443 "read-write"); 444 } 445 if (sc->sc_readcons != NULL) { 446 sbuf_printf(sb, "%s<read_offset>%jd</read_offset>\n", 447 indent, (intmax_t)sc->sc_readoffset); 448 sbuf_printf(sb, "%s<read_provider>%s</read_provider>\n", 449 indent, sc->sc_readcons->provider->name); 450 } 451 sbuf_printf(sb, "%s<timeout>%u</timeout>\n", indent, sc->sc_timeout); 452 sbuf_printf(sb, "%s<info>%s</info>\n", indent, sc->sc_info); 453 sbuf_printf(sb, "%s<queue_count>%u</queue_count>\n", indent, 454 sc->sc_queue_count); 455 sbuf_printf(sb, "%s<queue_size>%u</queue_size>\n", indent, 456 sc->sc_queue_size); 457 sbuf_printf(sb, "%s<ref>%u</ref>\n", indent, sc->sc_ref); 458 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, sc->sc_unit); 459 g_topology_unlock(); 460 g_gate_release(sc); 461 g_topology_lock(); 462 } 463 464 static int 465 g_gate_create(struct g_gate_ctl_create *ggio) 466 { 467 struct g_gate_softc *sc; 468 struct g_geom *gp; 469 struct g_provider *pp, *ropp; 470 struct g_consumer *cp; 471 char name[NAME_MAX + 1]; 472 char readprov[NAME_MAX + 1]; 473 int error = 0, unit; 474 475 if (ggio->gctl_mediasize <= 0) { 476 G_GATE_DEBUG(1, "Invalid media size."); 477 return (EINVAL); 478 } 479 if (ggio->gctl_sectorsize <= 0) { 480 G_GATE_DEBUG(1, "Invalid sector size."); 481 return (EINVAL); 482 } 483 if (!powerof2(ggio->gctl_sectorsize)) { 484 G_GATE_DEBUG(1, "Invalid sector size."); 485 return (EINVAL); 486 } 487 if ((ggio->gctl_mediasize % ggio->gctl_sectorsize) != 0) { 488 G_GATE_DEBUG(1, "Invalid media size."); 489 return (EINVAL); 490 } 491 if ((ggio->gctl_flags & G_GATE_FLAG_READONLY) != 0 && 492 (ggio->gctl_flags & G_GATE_FLAG_WRITEONLY) != 0) { 493 G_GATE_DEBUG(1, "Invalid flags."); 494 return (EINVAL); 495 } 496 if (ggio->gctl_unit != G_GATE_UNIT_AUTO && 497 ggio->gctl_unit != G_GATE_NAME_GIVEN && 498 ggio->gctl_unit < 0) { 499 G_GATE_DEBUG(1, "Invalid unit number."); 500 return (EINVAL); 501 } 502 if (ggio->gctl_unit == G_GATE_NAME_GIVEN && 503 ggio->gctl_name[0] == '\0') { 504 G_GATE_DEBUG(1, "No device name."); 505 return (EINVAL); 506 } 507 508 sc = malloc(sizeof(*sc), M_GATE, M_WAITOK | M_ZERO); 509 sc->sc_flags = (ggio->gctl_flags & G_GATE_USERFLAGS); 510 memset(sc->sc_info, 0, sizeof(sc->sc_info)); 511 strncpy(sc->sc_info, ggio->gctl_info, 512 MIN(sizeof(sc->sc_info) - 1, sizeof(ggio->gctl_info))); 513 sc->sc_seq = 1; 514 bioq_init(&sc->sc_inqueue); 515 bioq_init(&sc->sc_outqueue); 516 mtx_init(&sc->sc_queue_mtx, "gg:queue", NULL, MTX_DEF); 517 mtx_init(&sc->sc_read_mtx, "gg:read", NULL, MTX_DEF); 518 sc->sc_queue_count = 0; 519 sc->sc_queue_size = ggio->gctl_maxcount; 520 if (sc->sc_queue_size > G_GATE_MAX_QUEUE_SIZE) 521 sc->sc_queue_size = G_GATE_MAX_QUEUE_SIZE; 522 sc->sc_timeout = ggio->gctl_timeout; 523 callout_init(&sc->sc_callout, 1); 524 525 mtx_lock(&g_gate_units_lock); 526 sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error); 527 if (sc->sc_unit < 0) 528 goto fail1; 529 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) { 530 memset(name, 0, sizeof(name)); 531 strncpy(name, ggio->gctl_name, 532 MIN(sizeof(name) - 1, sizeof(ggio->gctl_name))); 533 } else { 534 snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME, 535 sc->sc_unit); 536 } 537 /* Check for name collision. */ 538 for (unit = 0; unit < g_gate_maxunits; unit++) { 539 if (g_gate_units[unit] == NULL) 540 continue; 541 if (strcmp(name, g_gate_units[unit]->sc_name) != 0) 542 continue; 543 error = EEXIST; 544 goto fail1; 545 } 546 // local stack buffer 'name' assigned here temporarily only. 547 // the real provider name is assigned below. 548 sc->sc_name = name; 549 g_gate_units[sc->sc_unit] = sc; 550 g_gate_nunits++; 551 mtx_unlock(&g_gate_units_lock); 552 553 g_topology_lock(); 554 555 if (ggio->gctl_readprov[0] == '\0') { 556 ropp = NULL; 557 } else { 558 memset(readprov, 0, sizeof(readprov)); 559 strncpy(readprov, ggio->gctl_readprov, 560 MIN(sizeof(readprov) - 1, sizeof(ggio->gctl_readprov))); 561 ropp = g_provider_by_name(readprov); 562 if (ropp == NULL) { 563 G_GATE_DEBUG(1, "Provider %s doesn't exist.", readprov); 564 error = EINVAL; 565 goto fail2; 566 } 567 if ((ggio->gctl_readoffset % ggio->gctl_sectorsize) != 0) { 568 G_GATE_DEBUG(1, "Invalid read offset."); 569 error = EINVAL; 570 goto fail2; 571 } 572 if (ggio->gctl_mediasize + ggio->gctl_readoffset > 573 ropp->mediasize) { 574 G_GATE_DEBUG(1, "Invalid read offset or media size."); 575 error = EINVAL; 576 goto fail2; 577 } 578 } 579 580 gp = g_new_geomf(&g_gate_class, "%s", name); 581 gp->start = g_gate_start; 582 gp->access = g_gate_access; 583 gp->orphan = g_gate_orphan; 584 gp->dumpconf = g_gate_dumpconf; 585 gp->softc = sc; 586 587 if (ropp != NULL) { 588 cp = g_new_consumer(gp); 589 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 590 error = g_attach(cp, ropp); 591 if (error != 0) { 592 G_GATE_DEBUG(1, "Unable to attach to %s.", ropp->name); 593 goto fail3; 594 } 595 error = g_access(cp, 1, 0, 0); 596 if (error != 0) { 597 G_GATE_DEBUG(1, "Unable to access %s.", ropp->name); 598 g_detach(cp); 599 goto fail3; 600 } 601 sc->sc_readcons = cp; 602 sc->sc_readoffset = ggio->gctl_readoffset; 603 } 604 605 ggio->gctl_unit = sc->sc_unit; 606 607 pp = g_new_providerf(gp, "%s", name); 608 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 609 pp->mediasize = ggio->gctl_mediasize; 610 pp->sectorsize = ggio->gctl_sectorsize; 611 sc->sc_provider = pp; 612 g_error_provider(pp, 0); 613 614 g_topology_unlock(); 615 mtx_lock(&g_gate_units_lock); 616 sc->sc_name = sc->sc_provider->name; 617 mtx_unlock(&g_gate_units_lock); 618 G_GATE_DEBUG(1, "Device %s created.", gp->name); 619 620 if (sc->sc_timeout > 0) { 621 callout_reset(&sc->sc_callout, sc->sc_timeout * hz, 622 g_gate_guard, sc); 623 } 624 return (0); 625 fail3: 626 g_destroy_consumer(cp); 627 g_destroy_geom(gp); 628 fail2: 629 g_topology_unlock(); 630 mtx_lock(&g_gate_units_lock); 631 g_gate_units[sc->sc_unit] = NULL; 632 KASSERT(g_gate_nunits > 0, ("negative g_gate_nunits?")); 633 g_gate_nunits--; 634 fail1: 635 mtx_unlock(&g_gate_units_lock); 636 mtx_destroy(&sc->sc_queue_mtx); 637 mtx_destroy(&sc->sc_read_mtx); 638 free(sc, M_GATE); 639 return (error); 640 } 641 642 static int 643 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio) 644 { 645 char readprov[NAME_MAX + 1]; 646 struct g_provider *pp; 647 struct g_consumer *cp; 648 int done, error; 649 650 if ((ggio->gctl_modify & GG_MODIFY_MEDIASIZE) != 0) { 651 if (ggio->gctl_mediasize <= 0) { 652 G_GATE_DEBUG(1, "Invalid media size."); 653 return (EINVAL); 654 } 655 pp = sc->sc_provider; 656 if ((ggio->gctl_mediasize % pp->sectorsize) != 0) { 657 G_GATE_DEBUG(1, "Invalid media size."); 658 return (EINVAL); 659 } 660 g_resize_provider(pp, ggio->gctl_mediasize); 661 return (0); 662 } 663 664 if ((ggio->gctl_modify & GG_MODIFY_INFO) != 0) { 665 memset(sc->sc_info, 0, sizeof(sc->sc_info)); 666 strncpy(sc->sc_info, ggio->gctl_info, 667 MIN(sizeof(sc->sc_info) - 1, sizeof(ggio->gctl_info))); 668 } 669 cp = NULL; 670 671 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 672 g_topology_lock(); 673 mtx_lock(&sc->sc_read_mtx); 674 if ((cp = sc->sc_readcons) != NULL) { 675 sc->sc_readcons = NULL; 676 done = (cp->index == 0); 677 mtx_unlock(&sc->sc_read_mtx); 678 if (done) 679 g_gate_detach(cp, 0); 680 } else 681 mtx_unlock(&sc->sc_read_mtx); 682 if (ggio->gctl_readprov[0] != '\0') { 683 memset(readprov, 0, sizeof(readprov)); 684 strncpy(readprov, ggio->gctl_readprov, 685 MIN(sizeof(readprov) - 1, 686 sizeof(ggio->gctl_readprov))); 687 pp = g_provider_by_name(readprov); 688 if (pp == NULL) { 689 g_topology_unlock(); 690 G_GATE_DEBUG(1, "Provider %s doesn't exist.", 691 readprov); 692 return (EINVAL); 693 } 694 cp = g_new_consumer(sc->sc_provider->geom); 695 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 696 error = g_attach(cp, pp); 697 if (error != 0) { 698 G_GATE_DEBUG(1, "Unable to attach to %s.", 699 pp->name); 700 } else { 701 error = g_access(cp, 1, 0, 0); 702 if (error != 0) { 703 G_GATE_DEBUG(1, "Unable to access %s.", 704 pp->name); 705 g_detach(cp); 706 } 707 } 708 if (error != 0) { 709 g_destroy_consumer(cp); 710 g_topology_unlock(); 711 return (error); 712 } 713 } 714 } else { 715 cp = sc->sc_readcons; 716 } 717 718 if ((ggio->gctl_modify & GG_MODIFY_READOFFSET) != 0) { 719 if (cp == NULL) { 720 G_GATE_DEBUG(1, "No read provider."); 721 return (EINVAL); 722 } 723 pp = sc->sc_provider; 724 if ((ggio->gctl_readoffset % pp->sectorsize) != 0) { 725 G_GATE_DEBUG(1, "Invalid read offset."); 726 return (EINVAL); 727 } 728 if (pp->mediasize + ggio->gctl_readoffset > 729 cp->provider->mediasize) { 730 G_GATE_DEBUG(1, "Invalid read offset or media size."); 731 return (EINVAL); 732 } 733 sc->sc_readoffset = ggio->gctl_readoffset; 734 } 735 736 if ((ggio->gctl_modify & GG_MODIFY_READPROV) != 0) { 737 sc->sc_readcons = cp; 738 g_topology_unlock(); 739 } 740 741 return (0); 742 } 743 744 #define G_GATE_CHECK_VERSION(ggio) do { \ 745 if ((ggio)->gctl_version != G_GATE_VERSION) { \ 746 printf("Version mismatch %d != %d.\n", \ 747 ggio->gctl_version, G_GATE_VERSION); \ 748 return (EINVAL); \ 749 } \ 750 } while (0) 751 static int 752 g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 753 { 754 struct g_gate_softc *sc; 755 struct bio *bp; 756 int error = 0; 757 758 G_GATE_DEBUG(4, "ioctl(%s, %lx, %p, %x, %p)", devtoname(dev), cmd, addr, 759 flags, td); 760 761 switch (cmd) { 762 case G_GATE_CMD_CREATE: 763 { 764 struct g_gate_ctl_create *ggio = (void *)addr; 765 766 G_GATE_CHECK_VERSION(ggio); 767 error = g_gate_create(ggio); 768 /* 769 * Reset TDP_GEOM flag. 770 * There are pending events for sure, because we just created 771 * new provider and other classes want to taste it, but we 772 * cannot answer on I/O requests until we're here. 773 */ 774 td->td_pflags &= ~TDP_GEOM; 775 return (error); 776 } 777 case G_GATE_CMD_MODIFY: 778 { 779 struct g_gate_ctl_modify *ggio = (void *)addr; 780 781 G_GATE_CHECK_VERSION(ggio); 782 sc = g_gate_hold(ggio->gctl_unit, NULL); 783 if (sc == NULL) 784 return (ENXIO); 785 error = g_gate_modify(sc, ggio); 786 g_gate_release(sc); 787 return (error); 788 } 789 case G_GATE_CMD_DESTROY: 790 { 791 struct g_gate_ctl_destroy *ggio = (void *)addr; 792 793 G_GATE_CHECK_VERSION(ggio); 794 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 795 if (sc == NULL) 796 return (ENXIO); 797 g_topology_lock(); 798 mtx_lock(&g_gate_units_lock); 799 error = g_gate_destroy(sc, ggio->gctl_force); 800 g_topology_unlock(); 801 if (error != 0) 802 g_gate_release(sc); 803 return (error); 804 } 805 case G_GATE_CMD_CANCEL: 806 { 807 struct g_gate_ctl_cancel *ggio = (void *)addr; 808 struct bio *tbp, *lbp; 809 810 G_GATE_CHECK_VERSION(ggio); 811 sc = g_gate_hold(ggio->gctl_unit, ggio->gctl_name); 812 if (sc == NULL) 813 return (ENXIO); 814 lbp = NULL; 815 mtx_lock(&sc->sc_queue_mtx); 816 TAILQ_FOREACH_SAFE(bp, &sc->sc_outqueue.queue, bio_queue, tbp) { 817 if (ggio->gctl_seq == 0 || 818 ggio->gctl_seq == (uintptr_t)bp->bio_driver1) { 819 G_GATE_LOGREQ(1, bp, "Request canceled."); 820 bioq_remove(&sc->sc_outqueue, bp); 821 /* 822 * Be sure to put requests back onto incoming 823 * queue in the proper order. 824 */ 825 if (lbp == NULL) 826 bioq_insert_head(&sc->sc_inqueue, bp); 827 else { 828 TAILQ_INSERT_AFTER(&sc->sc_inqueue.queue, 829 lbp, bp, bio_queue); 830 } 831 lbp = bp; 832 /* 833 * If only one request was canceled, leave now. 834 */ 835 if (ggio->gctl_seq != 0) 836 break; 837 } 838 } 839 if (ggio->gctl_unit == G_GATE_NAME_GIVEN) 840 ggio->gctl_unit = sc->sc_unit; 841 mtx_unlock(&sc->sc_queue_mtx); 842 g_gate_release(sc); 843 return (error); 844 } 845 case G_GATE_CMD_START: 846 { 847 struct g_gate_ctl_io *ggio = (void *)addr; 848 849 G_GATE_CHECK_VERSION(ggio); 850 sc = g_gate_hold(ggio->gctl_unit, NULL); 851 if (sc == NULL) 852 return (ENXIO); 853 error = 0; 854 for (;;) { 855 mtx_lock(&sc->sc_queue_mtx); 856 bp = bioq_first(&sc->sc_inqueue); 857 if (bp != NULL) 858 break; 859 if ((sc->sc_flags & G_GATE_FLAG_DESTROY) != 0) { 860 ggio->gctl_error = ECANCELED; 861 mtx_unlock(&sc->sc_queue_mtx); 862 goto start_end; 863 } 864 error = msleep(sc, &sc->sc_queue_mtx, 865 PPAUSE | PDROP | PCATCH, "ggwait", 0); 866 if (error != 0) 867 goto start_end; 868 } 869 ggio->gctl_cmd = bp->bio_cmd; 870 if (bp->bio_cmd == BIO_WRITE && 871 bp->bio_length > ggio->gctl_length) { 872 mtx_unlock(&sc->sc_queue_mtx); 873 ggio->gctl_length = bp->bio_length; 874 ggio->gctl_error = ENOMEM; 875 goto start_end; 876 } 877 bioq_remove(&sc->sc_inqueue, bp); 878 bioq_insert_tail(&sc->sc_outqueue, bp); 879 mtx_unlock(&sc->sc_queue_mtx); 880 881 ggio->gctl_seq = (uintptr_t)bp->bio_driver1; 882 ggio->gctl_offset = bp->bio_offset; 883 ggio->gctl_length = bp->bio_length; 884 885 switch (bp->bio_cmd) { 886 case BIO_READ: 887 case BIO_DELETE: 888 case BIO_FLUSH: 889 case BIO_SPEEDUP: 890 break; 891 case BIO_WRITE: 892 error = copyout(bp->bio_data, ggio->gctl_data, 893 bp->bio_length); 894 if (error != 0) { 895 mtx_lock(&sc->sc_queue_mtx); 896 bioq_remove(&sc->sc_outqueue, bp); 897 bioq_insert_head(&sc->sc_inqueue, bp); 898 mtx_unlock(&sc->sc_queue_mtx); 899 goto start_end; 900 } 901 break; 902 } 903 start_end: 904 g_gate_release(sc); 905 return (error); 906 } 907 case G_GATE_CMD_DONE: 908 { 909 struct g_gate_ctl_io *ggio = (void *)addr; 910 911 G_GATE_CHECK_VERSION(ggio); 912 sc = g_gate_hold(ggio->gctl_unit, NULL); 913 if (sc == NULL) 914 return (ENOENT); 915 error = 0; 916 mtx_lock(&sc->sc_queue_mtx); 917 TAILQ_FOREACH(bp, &sc->sc_outqueue.queue, bio_queue) { 918 if (ggio->gctl_seq == (uintptr_t)bp->bio_driver1) 919 break; 920 } 921 if (bp != NULL) { 922 bioq_remove(&sc->sc_outqueue, bp); 923 sc->sc_queue_count--; 924 } 925 mtx_unlock(&sc->sc_queue_mtx); 926 if (bp == NULL) { 927 /* 928 * Request was probably canceled. 929 */ 930 goto done_end; 931 } 932 if (ggio->gctl_error == EAGAIN) { 933 bp->bio_error = 0; 934 G_GATE_LOGREQ(1, bp, "Request desisted."); 935 mtx_lock(&sc->sc_queue_mtx); 936 sc->sc_queue_count++; 937 bioq_insert_head(&sc->sc_inqueue, bp); 938 wakeup(sc); 939 mtx_unlock(&sc->sc_queue_mtx); 940 } else { 941 bp->bio_error = ggio->gctl_error; 942 if (bp->bio_error == 0) { 943 bp->bio_completed = bp->bio_length; 944 switch (bp->bio_cmd) { 945 case BIO_READ: 946 error = copyin(ggio->gctl_data, 947 bp->bio_data, bp->bio_length); 948 if (error != 0) 949 bp->bio_error = error; 950 break; 951 case BIO_DELETE: 952 case BIO_WRITE: 953 case BIO_FLUSH: 954 case BIO_SPEEDUP: 955 break; 956 } 957 } 958 G_GATE_LOGREQ(2, bp, "Request done."); 959 g_io_deliver(bp, bp->bio_error); 960 } 961 done_end: 962 g_gate_release(sc); 963 return (error); 964 } 965 } 966 return (ENOIOCTL); 967 } 968 969 static void 970 g_gate_device(void) 971 { 972 973 status_dev = make_dev(&g_gate_cdevsw, 0x0, UID_ROOT, GID_WHEEL, 0600, 974 G_GATE_CTL_NAME); 975 } 976 977 static int 978 g_gate_modevent(module_t mod, int type, void *data) 979 { 980 int error = 0; 981 982 switch (type) { 983 case MOD_LOAD: 984 mtx_init(&g_gate_units_lock, "gg_units_lock", NULL, MTX_DEF); 985 g_gate_units = malloc(g_gate_maxunits * sizeof(g_gate_units[0]), 986 M_GATE, M_WAITOK | M_ZERO); 987 g_gate_nunits = 0; 988 g_gate_device(); 989 break; 990 case MOD_UNLOAD: 991 mtx_lock(&g_gate_units_lock); 992 if (g_gate_nunits > 0) { 993 mtx_unlock(&g_gate_units_lock); 994 error = EBUSY; 995 break; 996 } 997 mtx_unlock(&g_gate_units_lock); 998 mtx_destroy(&g_gate_units_lock); 999 if (status_dev != NULL) 1000 destroy_dev(status_dev); 1001 free(g_gate_units, M_GATE); 1002 break; 1003 default: 1004 return (EOPNOTSUPP); 1005 break; 1006 } 1007 1008 return (error); 1009 } 1010 static moduledata_t g_gate_module = { 1011 G_GATE_MOD_NAME, 1012 g_gate_modevent, 1013 NULL 1014 }; 1015 DECLARE_MODULE(geom_gate, g_gate_module, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 1016 DECLARE_GEOM_CLASS(g_gate_class, g_gate); 1017 MODULE_VERSION(geom_gate, 0);
Cache object: 59077019eb11ccb612aa327dcaf94c01
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