1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011-2013 Alexander Motin <mav@FreeBSD.org> 5 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 /* 30 * Based upon work by Pawel Jakub Dawidek <pjd@FreeBSD.org> for all of the 31 * fine geom examples, and by Poul Henning Kamp <phk@FreeBSD.org> for GEOM 32 * itself, all of which is most gratefully acknowledged. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/limits.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/bio.h> 45 #include <sys/sbuf.h> 46 #include <sys/sdt.h> 47 #include <sys/sysctl.h> 48 #include <sys/kthread.h> 49 #include <sys/malloc.h> 50 #include <geom/geom.h> 51 #include <geom/multipath/g_multipath.h> 52 53 FEATURE(geom_multipath, "GEOM multipath support"); 54 55 SYSCTL_DECL(_kern_geom); 56 static SYSCTL_NODE(_kern_geom, OID_AUTO, multipath, 57 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 58 "GEOM_MULTIPATH tunables"); 59 static u_int g_multipath_debug = 0; 60 SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, debug, CTLFLAG_RW, 61 &g_multipath_debug, 0, "Debug level"); 62 static u_int g_multipath_exclusive = 1; 63 SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, exclusive, CTLFLAG_RW, 64 &g_multipath_exclusive, 0, "Exclusively open providers"); 65 66 SDT_PROVIDER_DECLARE(geom); 67 SDT_PROBE_DEFINE2(geom, multipath, config, restore, "char*", "char*"); 68 SDT_PROBE_DEFINE2(geom, multipath, config, remove, "char*", "char*"); 69 SDT_PROBE_DEFINE2(geom, multipath, config, disconnect, "char*", "char*"); 70 SDT_PROBE_DEFINE3(geom, multipath, config, fail, "char*", "char*", "int"); 71 SDT_PROBE_DEFINE2(geom, multipath, config, taste, "char*", "char*"); 72 SDT_PROBE_DEFINE2(geom, multipath, io, restart, "struct bio*", "struct bio*"); 73 74 static enum { 75 GKT_NIL, 76 GKT_RUN, 77 GKT_DIE 78 } g_multipath_kt_state; 79 static struct bio_queue_head gmtbq; 80 static struct mtx gmtbq_mtx; 81 82 static int g_multipath_read_metadata(struct g_consumer *cp, 83 struct g_multipath_metadata *md); 84 static int g_multipath_write_metadata(struct g_consumer *cp, 85 struct g_multipath_metadata *md); 86 87 static void g_multipath_orphan(struct g_consumer *); 88 static void g_multipath_resize(struct g_consumer *); 89 static void g_multipath_start(struct bio *); 90 static void g_multipath_done(struct bio *); 91 static void g_multipath_done_error(struct bio *); 92 static void g_multipath_kt(void *); 93 94 static int g_multipath_destroy(struct g_geom *); 95 static int 96 g_multipath_destroy_geom(struct gctl_req *, struct g_class *, struct g_geom *); 97 98 static struct g_geom *g_multipath_find_geom(struct g_class *, const char *); 99 static int g_multipath_rotate(struct g_geom *); 100 101 static g_taste_t g_multipath_taste; 102 static g_ctl_req_t g_multipath_config; 103 static g_init_t g_multipath_init; 104 static g_fini_t g_multipath_fini; 105 static g_dumpconf_t g_multipath_dumpconf; 106 107 struct g_class g_multipath_class = { 108 .name = G_MULTIPATH_CLASS_NAME, 109 .version = G_VERSION, 110 .ctlreq = g_multipath_config, 111 .taste = g_multipath_taste, 112 .destroy_geom = g_multipath_destroy_geom, 113 .init = g_multipath_init, 114 .fini = g_multipath_fini 115 }; 116 117 #define MP_FAIL 0x00000001 118 #define MP_LOST 0x00000002 119 #define MP_NEW 0x00000004 120 #define MP_POSTED 0x00000008 121 #define MP_BAD (MP_FAIL | MP_LOST | MP_NEW) 122 #define MP_WITHER 0x00000010 123 #define MP_IDLE 0x00000020 124 #define MP_IDLE_MASK 0xffffffe0 125 126 static int 127 g_multipath_good(struct g_geom *gp) 128 { 129 struct g_consumer *cp; 130 int n = 0; 131 132 LIST_FOREACH(cp, &gp->consumer, consumer) { 133 if ((cp->index & MP_BAD) == 0) 134 n++; 135 } 136 return (n); 137 } 138 139 static void 140 g_multipath_fault(struct g_consumer *cp, int cause) 141 { 142 struct g_multipath_softc *sc; 143 struct g_consumer *lcp; 144 struct g_geom *gp; 145 146 gp = cp->geom; 147 sc = gp->softc; 148 cp->index |= cause; 149 if (g_multipath_good(gp) == 0 && sc->sc_ndisks > 0) { 150 LIST_FOREACH(lcp, &gp->consumer, consumer) { 151 if (lcp->provider == NULL || 152 (lcp->index & (MP_LOST | MP_NEW))) 153 continue; 154 if (sc->sc_ndisks > 1 && lcp == cp) 155 continue; 156 printf("GEOM_MULTIPATH: " 157 "all paths in %s were marked FAIL, restore %s\n", 158 sc->sc_name, lcp->provider->name); 159 SDT_PROBE2(geom, multipath, config, restore, 160 sc->sc_name, lcp->provider->name); 161 lcp->index &= ~MP_FAIL; 162 } 163 } 164 if (cp != sc->sc_active) 165 return; 166 sc->sc_active = NULL; 167 LIST_FOREACH(lcp, &gp->consumer, consumer) { 168 if ((lcp->index & MP_BAD) == 0) { 169 sc->sc_active = lcp; 170 break; 171 } 172 } 173 if (sc->sc_active == NULL) { 174 printf("GEOM_MULTIPATH: out of providers for %s\n", 175 sc->sc_name); 176 } else if (sc->sc_active_active != 1) { 177 printf("GEOM_MULTIPATH: %s is now active path in %s\n", 178 sc->sc_active->provider->name, sc->sc_name); 179 } 180 } 181 182 static struct g_consumer * 183 g_multipath_choose(struct g_geom *gp, struct bio *bp) 184 { 185 struct g_multipath_softc *sc; 186 struct g_consumer *best, *cp; 187 188 sc = gp->softc; 189 if (sc->sc_active_active == 0 || 190 (sc->sc_active_active == 2 && bp->bio_cmd != BIO_READ)) 191 return (sc->sc_active); 192 best = NULL; 193 LIST_FOREACH(cp, &gp->consumer, consumer) { 194 if (cp->index & MP_BAD) 195 continue; 196 cp->index += MP_IDLE; 197 if (best == NULL || cp->private < best->private || 198 (cp->private == best->private && cp->index > best->index)) 199 best = cp; 200 } 201 if (best != NULL) 202 best->index &= ~MP_IDLE_MASK; 203 return (best); 204 } 205 206 static void 207 g_mpd(void *arg, int flags __unused) 208 { 209 struct g_geom *gp; 210 struct g_multipath_softc *sc; 211 struct g_consumer *cp; 212 int w; 213 214 g_topology_assert(); 215 cp = arg; 216 gp = cp->geom; 217 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) { 218 w = cp->acw; 219 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 220 if (w > 0 && cp->provider != NULL && 221 (cp->provider->geom->flags & G_GEOM_WITHER) == 0) { 222 cp->index |= MP_WITHER; 223 g_post_event(g_mpd, cp, M_WAITOK, NULL); 224 return; 225 } 226 } 227 sc = gp->softc; 228 mtx_lock(&sc->sc_mtx); 229 if (cp->provider) { 230 printf("GEOM_MULTIPATH: %s removed from %s\n", 231 cp->provider->name, gp->name); 232 SDT_PROBE2(geom, multipath, config, remove, 233 gp->name, cp->provider->name); 234 g_detach(cp); 235 } 236 g_destroy_consumer(cp); 237 mtx_unlock(&sc->sc_mtx); 238 if (LIST_EMPTY(&gp->consumer)) 239 g_multipath_destroy(gp); 240 } 241 242 static void 243 g_multipath_orphan(struct g_consumer *cp) 244 { 245 struct g_multipath_softc *sc; 246 uintptr_t *cnt; 247 248 g_topology_assert(); 249 printf("GEOM_MULTIPATH: %s in %s was disconnected\n", 250 cp->provider->name, cp->geom->name); 251 SDT_PROBE2(geom, multipath, config, disconnect, 252 cp->geom->name, cp->provider->name); 253 sc = cp->geom->softc; 254 cnt = (uintptr_t *)&cp->private; 255 mtx_lock(&sc->sc_mtx); 256 sc->sc_ndisks--; 257 g_multipath_fault(cp, MP_LOST); 258 if (*cnt == 0 && (cp->index & MP_POSTED) == 0) { 259 cp->index |= MP_POSTED; 260 mtx_unlock(&sc->sc_mtx); 261 g_mpd(cp, 0); 262 } else 263 mtx_unlock(&sc->sc_mtx); 264 } 265 266 static void 267 g_multipath_resize(struct g_consumer *cp) 268 { 269 struct g_multipath_softc *sc; 270 struct g_geom *gp; 271 struct g_consumer *cp1; 272 struct g_provider *pp; 273 struct g_multipath_metadata md; 274 off_t size, psize, ssize; 275 int error; 276 277 g_topology_assert(); 278 279 gp = cp->geom; 280 pp = cp->provider; 281 sc = gp->softc; 282 283 if (sc->sc_stopping) 284 return; 285 286 if (pp->mediasize < sc->sc_size) { 287 size = pp->mediasize; 288 ssize = pp->sectorsize; 289 } else { 290 size = ssize = OFF_MAX; 291 mtx_lock(&sc->sc_mtx); 292 LIST_FOREACH(cp1, &gp->consumer, consumer) { 293 pp = cp1->provider; 294 if (pp == NULL) 295 continue; 296 if (pp->mediasize < size) { 297 size = pp->mediasize; 298 ssize = pp->sectorsize; 299 } 300 } 301 mtx_unlock(&sc->sc_mtx); 302 if (size == OFF_MAX || size == sc->sc_size) 303 return; 304 } 305 psize = size - ((sc->sc_uuid[0] != 0) ? ssize : 0); 306 printf("GEOM_MULTIPATH: %s size changed from %jd to %jd\n", 307 sc->sc_name, sc->sc_pp->mediasize, psize); 308 if (sc->sc_uuid[0] != 0 && size < sc->sc_size) { 309 error = g_multipath_read_metadata(cp, &md); 310 if (error || 311 (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) || 312 (memcmp(md.md_uuid, sc->sc_uuid, sizeof(sc->sc_uuid)) != 0) || 313 (strcmp(md.md_name, sc->sc_name) != 0) || 314 (md.md_size != 0 && md.md_size != size) || 315 (md.md_sectorsize != 0 && md.md_sectorsize != ssize)) { 316 g_multipath_destroy(gp); 317 return; 318 } 319 } 320 sc->sc_size = size; 321 g_resize_provider(sc->sc_pp, psize); 322 323 if (sc->sc_uuid[0] != 0) { 324 pp = cp->provider; 325 strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic)); 326 memcpy(md.md_uuid, sc->sc_uuid, sizeof (sc->sc_uuid)); 327 strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name)); 328 md.md_version = G_MULTIPATH_VERSION; 329 md.md_size = size; 330 md.md_sectorsize = ssize; 331 md.md_active_active = sc->sc_active_active; 332 error = g_multipath_write_metadata(cp, &md); 333 if (error != 0) 334 printf("GEOM_MULTIPATH: Can't update metadata on %s " 335 "(%d)\n", pp->name, error); 336 } 337 } 338 339 static void 340 g_multipath_start(struct bio *bp) 341 { 342 struct g_multipath_softc *sc; 343 struct g_geom *gp; 344 struct g_consumer *cp; 345 struct bio *cbp; 346 uintptr_t *cnt; 347 348 gp = bp->bio_to->geom; 349 sc = gp->softc; 350 KASSERT(sc != NULL, ("NULL sc")); 351 cbp = g_clone_bio(bp); 352 if (cbp == NULL) { 353 g_io_deliver(bp, ENOMEM); 354 return; 355 } 356 mtx_lock(&sc->sc_mtx); 357 cp = g_multipath_choose(gp, bp); 358 if (cp == NULL) { 359 mtx_unlock(&sc->sc_mtx); 360 g_destroy_bio(cbp); 361 g_io_deliver(bp, ENXIO); 362 return; 363 } 364 if ((uintptr_t)bp->bio_driver1 < sc->sc_ndisks) 365 bp->bio_driver1 = (void *)(uintptr_t)sc->sc_ndisks; 366 cnt = (uintptr_t *)&cp->private; 367 (*cnt)++; 368 mtx_unlock(&sc->sc_mtx); 369 cbp->bio_done = g_multipath_done; 370 g_io_request(cbp, cp); 371 } 372 373 static void 374 g_multipath_done(struct bio *bp) 375 { 376 struct g_multipath_softc *sc; 377 struct g_consumer *cp; 378 uintptr_t *cnt; 379 380 if (bp->bio_error == ENXIO || bp->bio_error == EIO) { 381 mtx_lock(&gmtbq_mtx); 382 bioq_insert_tail(&gmtbq, bp); 383 mtx_unlock(&gmtbq_mtx); 384 wakeup(&g_multipath_kt_state); 385 } else { 386 cp = bp->bio_from; 387 sc = cp->geom->softc; 388 cnt = (uintptr_t *)&cp->private; 389 mtx_lock(&sc->sc_mtx); 390 (*cnt)--; 391 if (*cnt == 0 && (cp->index & MP_LOST)) { 392 if (g_post_event(g_mpd, cp, M_NOWAIT, NULL) == 0) 393 cp->index |= MP_POSTED; 394 mtx_unlock(&sc->sc_mtx); 395 } else 396 mtx_unlock(&sc->sc_mtx); 397 if (bp->bio_error == 0 && 398 bp->bio_cmd == BIO_GETATTR && 399 !strcmp(bp->bio_attribute, "GEOM::physpath")) 400 { 401 strlcat(bp->bio_data, "/mp", bp->bio_length); 402 } 403 g_std_done(bp); 404 } 405 } 406 407 static void 408 g_multipath_done_error(struct bio *bp) 409 { 410 struct bio *pbp; 411 struct g_geom *gp; 412 struct g_multipath_softc *sc; 413 struct g_consumer *cp; 414 struct g_provider *pp; 415 uintptr_t *cnt; 416 417 /* 418 * If we had a failure, we have to check first to see 419 * whether the consumer it failed on was the currently 420 * active consumer (i.e., this is the first in perhaps 421 * a number of failures). If so, we then switch consumers 422 * to the next available consumer. 423 */ 424 425 pbp = bp->bio_parent; 426 gp = pbp->bio_to->geom; 427 sc = gp->softc; 428 cp = bp->bio_from; 429 pp = cp->provider; 430 cnt = (uintptr_t *)&cp->private; 431 432 mtx_lock(&sc->sc_mtx); 433 if ((cp->index & MP_FAIL) == 0) { 434 printf("GEOM_MULTIPATH: Error %d, %s in %s marked FAIL\n", 435 bp->bio_error, pp->name, sc->sc_name); 436 SDT_PROBE3(geom, multipath, config, fail, 437 sc->sc_name, pp->name, bp->bio_error); 438 g_multipath_fault(cp, MP_FAIL); 439 } 440 (*cnt)--; 441 if (*cnt == 0 && (cp->index & (MP_LOST | MP_POSTED)) == MP_LOST) { 442 cp->index |= MP_POSTED; 443 mtx_unlock(&sc->sc_mtx); 444 g_post_event(g_mpd, cp, M_WAITOK, NULL); 445 } else 446 mtx_unlock(&sc->sc_mtx); 447 448 /* 449 * If we can fruitfully restart the I/O, do so. 450 */ 451 if (pbp->bio_children < (uintptr_t)pbp->bio_driver1) { 452 pbp->bio_inbed++; 453 SDT_PROBE2(geom, multipath, io, restart, bp, pbp); 454 g_destroy_bio(bp); 455 g_multipath_start(pbp); 456 } else { 457 g_std_done(bp); 458 } 459 } 460 461 static void 462 g_multipath_kt(void *arg) 463 { 464 465 g_multipath_kt_state = GKT_RUN; 466 mtx_lock(&gmtbq_mtx); 467 while (g_multipath_kt_state == GKT_RUN) { 468 for (;;) { 469 struct bio *bp; 470 471 bp = bioq_takefirst(&gmtbq); 472 if (bp == NULL) 473 break; 474 mtx_unlock(&gmtbq_mtx); 475 g_multipath_done_error(bp); 476 mtx_lock(&gmtbq_mtx); 477 } 478 if (g_multipath_kt_state != GKT_RUN) 479 break; 480 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 481 "gkt:wait", 0); 482 } 483 mtx_unlock(&gmtbq_mtx); 484 wakeup(&g_multipath_kt_state); 485 kproc_exit(0); 486 } 487 488 static int 489 g_multipath_access(struct g_provider *pp, int dr, int dw, int de) 490 { 491 struct g_geom *gp; 492 struct g_consumer *cp, *badcp = NULL; 493 struct g_multipath_softc *sc; 494 int error; 495 496 gp = pp->geom; 497 498 /* Error used if we have no valid consumers. */ 499 error = (dr > 0 || dw > 0 || de > 0) ? ENXIO : 0; 500 501 LIST_FOREACH(cp, &gp->consumer, consumer) { 502 if (cp->index & MP_WITHER) 503 continue; 504 505 error = g_access(cp, dr, dw, de); 506 if (error) { 507 badcp = cp; 508 goto fail; 509 } 510 } 511 512 if (error != 0) 513 return (error); 514 515 sc = gp->softc; 516 sc->sc_opened += dr + dw + de; 517 if (sc->sc_stopping && sc->sc_opened == 0) 518 g_multipath_destroy(gp); 519 520 return (0); 521 522 fail: 523 LIST_FOREACH(cp, &gp->consumer, consumer) { 524 if (cp == badcp) 525 break; 526 if (cp->index & MP_WITHER) 527 continue; 528 529 (void) g_access(cp, -dr, -dw, -de); 530 } 531 return (error); 532 } 533 534 static struct g_geom * 535 g_multipath_create(struct g_class *mp, struct g_multipath_metadata *md) 536 { 537 struct g_multipath_softc *sc; 538 struct g_geom *gp; 539 struct g_provider *pp; 540 541 g_topology_assert(); 542 543 LIST_FOREACH(gp, &mp->geom, geom) { 544 sc = gp->softc; 545 if (sc == NULL || sc->sc_stopping) 546 continue; 547 if (strcmp(gp->name, md->md_name) == 0) { 548 printf("GEOM_MULTIPATH: name %s already exists\n", 549 md->md_name); 550 return (NULL); 551 } 552 } 553 554 gp = g_new_geomf(mp, "%s", md->md_name); 555 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 556 mtx_init(&sc->sc_mtx, "multipath", NULL, MTX_DEF); 557 memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid)); 558 memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name)); 559 sc->sc_active_active = md->md_active_active; 560 sc->sc_size = md->md_size; 561 gp->softc = sc; 562 gp->start = g_multipath_start; 563 gp->orphan = g_multipath_orphan; 564 gp->resize = g_multipath_resize; 565 gp->access = g_multipath_access; 566 gp->dumpconf = g_multipath_dumpconf; 567 568 pp = g_new_providerf(gp, "multipath/%s", md->md_name); 569 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 570 if (md->md_size != 0) { 571 pp->mediasize = md->md_size - 572 ((md->md_uuid[0] != 0) ? md->md_sectorsize : 0); 573 pp->sectorsize = md->md_sectorsize; 574 } 575 sc->sc_pp = pp; 576 g_error_provider(pp, 0); 577 printf("GEOM_MULTIPATH: %s created\n", gp->name); 578 return (gp); 579 } 580 581 static int 582 g_multipath_add_disk(struct g_geom *gp, struct g_provider *pp) 583 { 584 struct g_multipath_softc *sc; 585 struct g_consumer *cp; 586 int error, acr, acw, ace; 587 588 g_topology_assert(); 589 590 sc = gp->softc; 591 KASSERT(sc, ("no softc")); 592 593 /* 594 * Make sure that the passed provider isn't already attached 595 */ 596 LIST_FOREACH(cp, &gp->consumer, consumer) { 597 if (cp->provider == pp) 598 break; 599 } 600 if (cp) { 601 printf("GEOM_MULTIPATH: provider %s already attached to %s\n", 602 pp->name, gp->name); 603 return (EEXIST); 604 } 605 cp = g_new_consumer(gp); 606 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 607 cp->private = NULL; 608 cp->index = MP_NEW; 609 error = g_attach(cp, pp); 610 if (error != 0) { 611 printf("GEOM_MULTIPATH: cannot attach %s to %s", 612 pp->name, sc->sc_name); 613 g_destroy_consumer(cp); 614 return (error); 615 } 616 617 /* 618 * Set access permissions on new consumer to match other consumers 619 */ 620 if (sc->sc_pp) { 621 acr = sc->sc_pp->acr; 622 acw = sc->sc_pp->acw; 623 ace = sc->sc_pp->ace; 624 } else 625 acr = acw = ace = 0; 626 if (g_multipath_exclusive) { 627 acr++; 628 acw++; 629 ace++; 630 } 631 error = g_access(cp, acr, acw, ace); 632 if (error) { 633 printf("GEOM_MULTIPATH: cannot set access in " 634 "attaching %s to %s (%d)\n", 635 pp->name, sc->sc_name, error); 636 g_detach(cp); 637 g_destroy_consumer(cp); 638 return (error); 639 } 640 if (sc->sc_size == 0) { 641 sc->sc_size = pp->mediasize - 642 ((sc->sc_uuid[0] != 0) ? pp->sectorsize : 0); 643 sc->sc_pp->mediasize = sc->sc_size; 644 sc->sc_pp->sectorsize = pp->sectorsize; 645 } 646 if (sc->sc_pp->stripesize == 0 && sc->sc_pp->stripeoffset == 0) { 647 sc->sc_pp->stripesize = pp->stripesize; 648 sc->sc_pp->stripeoffset = pp->stripeoffset; 649 } 650 sc->sc_pp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED; 651 mtx_lock(&sc->sc_mtx); 652 cp->index = 0; 653 sc->sc_ndisks++; 654 mtx_unlock(&sc->sc_mtx); 655 printf("GEOM_MULTIPATH: %s added to %s\n", 656 pp->name, sc->sc_name); 657 if (sc->sc_active == NULL) { 658 sc->sc_active = cp; 659 if (sc->sc_active_active != 1) 660 printf("GEOM_MULTIPATH: %s is now active path in %s\n", 661 pp->name, sc->sc_name); 662 } 663 return (0); 664 } 665 666 static int 667 g_multipath_destroy(struct g_geom *gp) 668 { 669 struct g_multipath_softc *sc; 670 struct g_consumer *cp, *cp1; 671 672 g_topology_assert(); 673 if (gp->softc == NULL) 674 return (ENXIO); 675 sc = gp->softc; 676 if (!sc->sc_stopping) { 677 printf("GEOM_MULTIPATH: destroying %s\n", gp->name); 678 sc->sc_stopping = 1; 679 } 680 if (sc->sc_opened != 0) { 681 g_wither_provider(sc->sc_pp, ENXIO); 682 sc->sc_pp = NULL; 683 return (EINPROGRESS); 684 } 685 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) { 686 mtx_lock(&sc->sc_mtx); 687 if ((cp->index & MP_POSTED) == 0) { 688 cp->index |= MP_POSTED; 689 mtx_unlock(&sc->sc_mtx); 690 g_mpd(cp, 0); 691 if (cp1 == NULL) 692 return(0); /* Recursion happened. */ 693 } else 694 mtx_unlock(&sc->sc_mtx); 695 } 696 if (!LIST_EMPTY(&gp->consumer)) 697 return (EINPROGRESS); 698 mtx_destroy(&sc->sc_mtx); 699 g_free(gp->softc); 700 gp->softc = NULL; 701 printf("GEOM_MULTIPATH: %s destroyed\n", gp->name); 702 g_wither_geom(gp, ENXIO); 703 return (0); 704 } 705 706 static int 707 g_multipath_destroy_geom(struct gctl_req *req, struct g_class *mp, 708 struct g_geom *gp) 709 { 710 711 return (g_multipath_destroy(gp)); 712 } 713 714 static int 715 g_multipath_rotate(struct g_geom *gp) 716 { 717 struct g_consumer *lcp, *first_good_cp = NULL; 718 struct g_multipath_softc *sc = gp->softc; 719 int active_cp_seen = 0; 720 721 g_topology_assert(); 722 if (sc == NULL) 723 return (ENXIO); 724 LIST_FOREACH(lcp, &gp->consumer, consumer) { 725 if ((lcp->index & MP_BAD) == 0) { 726 if (first_good_cp == NULL) 727 first_good_cp = lcp; 728 if (active_cp_seen) 729 break; 730 } 731 if (sc->sc_active == lcp) 732 active_cp_seen = 1; 733 } 734 if (lcp == NULL) 735 lcp = first_good_cp; 736 if (lcp && lcp != sc->sc_active) { 737 sc->sc_active = lcp; 738 if (sc->sc_active_active != 1) 739 printf("GEOM_MULTIPATH: %s is now active path in %s\n", 740 lcp->provider->name, sc->sc_name); 741 } 742 return (0); 743 } 744 745 static void 746 g_multipath_init(struct g_class *mp) 747 { 748 bioq_init(&gmtbq); 749 mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF); 750 kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt"); 751 } 752 753 static void 754 g_multipath_fini(struct g_class *mp) 755 { 756 if (g_multipath_kt_state == GKT_RUN) { 757 mtx_lock(&gmtbq_mtx); 758 g_multipath_kt_state = GKT_DIE; 759 wakeup(&g_multipath_kt_state); 760 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 761 "gmp:fini", 0); 762 mtx_unlock(&gmtbq_mtx); 763 } 764 } 765 766 static int 767 g_multipath_read_metadata(struct g_consumer *cp, 768 struct g_multipath_metadata *md) 769 { 770 struct g_provider *pp; 771 u_char *buf; 772 int error; 773 774 g_topology_assert(); 775 error = g_access(cp, 1, 0, 0); 776 if (error != 0) 777 return (error); 778 pp = cp->provider; 779 g_topology_unlock(); 780 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, 781 pp->sectorsize, &error); 782 g_topology_lock(); 783 g_access(cp, -1, 0, 0); 784 if (buf == NULL) 785 return (error); 786 multipath_metadata_decode(buf, md); 787 g_free(buf); 788 return (0); 789 } 790 791 static int 792 g_multipath_write_metadata(struct g_consumer *cp, 793 struct g_multipath_metadata *md) 794 { 795 struct g_provider *pp; 796 u_char *buf; 797 int error; 798 799 g_topology_assert(); 800 error = g_access(cp, 1, 1, 1); 801 if (error != 0) 802 return (error); 803 pp = cp->provider; 804 g_topology_unlock(); 805 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 806 multipath_metadata_encode(md, buf); 807 error = g_write_data(cp, pp->mediasize - pp->sectorsize, 808 buf, pp->sectorsize); 809 g_topology_lock(); 810 g_access(cp, -1, -1, -1); 811 g_free(buf); 812 return (error); 813 } 814 815 static struct g_geom * 816 g_multipath_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 817 { 818 struct g_multipath_metadata md; 819 struct g_multipath_softc *sc; 820 struct g_consumer *cp; 821 struct g_geom *gp, *gp1; 822 int error, isnew; 823 824 g_topology_assert(); 825 826 gp = g_new_geomf(mp, "multipath:taste"); 827 gp->start = g_multipath_start; 828 gp->access = g_multipath_access; 829 gp->orphan = g_multipath_orphan; 830 cp = g_new_consumer(gp); 831 error = g_attach(cp, pp); 832 if (error == 0) { 833 error = g_multipath_read_metadata(cp, &md); 834 g_detach(cp); 835 } 836 g_destroy_consumer(cp); 837 g_destroy_geom(gp); 838 if (error != 0) 839 return (NULL); 840 gp = NULL; 841 842 if (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) { 843 if (g_multipath_debug) 844 printf("%s is not MULTIPATH\n", pp->name); 845 return (NULL); 846 } 847 if (md.md_version != G_MULTIPATH_VERSION) { 848 printf("%s has version %d multipath id- this module is version " 849 " %d: rejecting\n", pp->name, md.md_version, 850 G_MULTIPATH_VERSION); 851 return (NULL); 852 } 853 if (md.md_size != 0 && md.md_size != pp->mediasize) 854 return (NULL); 855 if (md.md_sectorsize != 0 && md.md_sectorsize != pp->sectorsize) 856 return (NULL); 857 if (g_multipath_debug) 858 printf("MULTIPATH: %s/%s\n", md.md_name, md.md_uuid); 859 SDT_PROBE2(geom, multipath, config, taste, md.md_name, md.md_uuid); 860 861 /* 862 * Let's check if such a device already is present. We check against 863 * uuid alone first because that's the true distinguishor. If that 864 * passes, then we check for name conflicts. If there are conflicts, 865 * modify the name. 866 * 867 * The whole purpose of this is to solve the problem that people don't 868 * pick good unique names, but good unique names (like uuids) are a 869 * pain to use. So, we allow people to build GEOMs with friendly names 870 * and uuids, and modify the names in case there's a collision. 871 */ 872 sc = NULL; 873 LIST_FOREACH(gp, &mp->geom, geom) { 874 sc = gp->softc; 875 if (sc == NULL || sc->sc_stopping) 876 continue; 877 if (strncmp(md.md_uuid, sc->sc_uuid, sizeof(md.md_uuid)) == 0) 878 break; 879 } 880 881 LIST_FOREACH(gp1, &mp->geom, geom) { 882 if (gp1 == gp) 883 continue; 884 sc = gp1->softc; 885 if (sc == NULL || sc->sc_stopping) 886 continue; 887 if (strncmp(md.md_name, sc->sc_name, sizeof(md.md_name)) == 0) 888 break; 889 } 890 891 /* 892 * If gp is NULL, we had no extant MULTIPATH geom with this uuid. 893 * 894 * If gp1 is *not* NULL, that means we have a MULTIPATH geom extant 895 * with the same name (but a different UUID). 896 * 897 * If gp is NULL, then modify the name with a random number and 898 * complain, but allow the creation of the geom to continue. 899 * 900 * If gp is *not* NULL, just use the geom's name as we're attaching 901 * this disk to the (previously generated) name. 902 */ 903 904 if (gp1) { 905 sc = gp1->softc; 906 if (gp == NULL) { 907 char buf[16]; 908 u_long rand = random(); 909 910 snprintf(buf, sizeof (buf), "%s-%lu", md.md_name, rand); 911 printf("GEOM_MULTIPATH: geom %s/%s exists already\n", 912 sc->sc_name, sc->sc_uuid); 913 printf("GEOM_MULTIPATH: %s will be (temporarily) %s\n", 914 md.md_uuid, buf); 915 strlcpy(md.md_name, buf, sizeof(md.md_name)); 916 } else { 917 strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name)); 918 } 919 } 920 921 if (gp == NULL) { 922 gp = g_multipath_create(mp, &md); 923 if (gp == NULL) { 924 printf("GEOM_MULTIPATH: cannot create geom %s/%s\n", 925 md.md_name, md.md_uuid); 926 return (NULL); 927 } 928 isnew = 1; 929 } else { 930 isnew = 0; 931 } 932 933 sc = gp->softc; 934 KASSERT(sc != NULL, ("sc is NULL")); 935 error = g_multipath_add_disk(gp, pp); 936 if (error != 0) { 937 if (isnew) 938 g_multipath_destroy(gp); 939 return (NULL); 940 } 941 return (gp); 942 } 943 944 static void 945 g_multipath_ctl_add_name(struct gctl_req *req, struct g_class *mp, 946 const char *name) 947 { 948 struct g_multipath_softc *sc; 949 struct g_geom *gp; 950 struct g_consumer *cp; 951 struct g_provider *pp; 952 const char *mpname; 953 static const char devpf[6] = _PATH_DEV; 954 int error; 955 956 g_topology_assert(); 957 958 mpname = gctl_get_asciiparam(req, "arg0"); 959 if (mpname == NULL) { 960 gctl_error(req, "No 'arg0' argument"); 961 return; 962 } 963 gp = g_multipath_find_geom(mp, mpname); 964 if (gp == NULL) { 965 gctl_error(req, "Device %s is invalid", mpname); 966 return; 967 } 968 sc = gp->softc; 969 970 if (strncmp(name, devpf, 5) == 0) 971 name += 5; 972 pp = g_provider_by_name(name); 973 if (pp == NULL) { 974 gctl_error(req, "Provider %s is invalid", name); 975 return; 976 } 977 978 /* 979 * Check to make sure parameters match. 980 */ 981 LIST_FOREACH(cp, &gp->consumer, consumer) { 982 if (cp->provider == pp) { 983 gctl_error(req, "provider %s is already there", 984 pp->name); 985 return; 986 } 987 } 988 if (sc->sc_pp->mediasize != 0 && 989 sc->sc_pp->mediasize + (sc->sc_uuid[0] != 0 ? pp->sectorsize : 0) 990 != pp->mediasize) { 991 gctl_error(req, "Providers size mismatch %jd != %jd", 992 (intmax_t) sc->sc_pp->mediasize + 993 (sc->sc_uuid[0] != 0 ? pp->sectorsize : 0), 994 (intmax_t) pp->mediasize); 995 return; 996 } 997 if (sc->sc_pp->sectorsize != 0 && 998 sc->sc_pp->sectorsize != pp->sectorsize) { 999 gctl_error(req, "Providers sectorsize mismatch %u != %u", 1000 sc->sc_pp->sectorsize, pp->sectorsize); 1001 return; 1002 } 1003 1004 error = g_multipath_add_disk(gp, pp); 1005 if (error != 0) 1006 gctl_error(req, "Provider addition error: %d", error); 1007 } 1008 1009 static void 1010 g_multipath_ctl_prefer(struct gctl_req *req, struct g_class *mp) 1011 { 1012 struct g_geom *gp; 1013 struct g_multipath_softc *sc; 1014 struct g_consumer *cp; 1015 const char *name, *mpname; 1016 static const char devpf[6] = _PATH_DEV; 1017 int *nargs; 1018 1019 g_topology_assert(); 1020 1021 mpname = gctl_get_asciiparam(req, "arg0"); 1022 if (mpname == NULL) { 1023 gctl_error(req, "No 'arg0' argument"); 1024 return; 1025 } 1026 gp = g_multipath_find_geom(mp, mpname); 1027 if (gp == NULL) { 1028 gctl_error(req, "Device %s is invalid", mpname); 1029 return; 1030 } 1031 sc = gp->softc; 1032 1033 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 1034 if (nargs == NULL) { 1035 gctl_error(req, "No 'nargs' argument"); 1036 return; 1037 } 1038 if (*nargs != 2) { 1039 gctl_error(req, "missing device"); 1040 return; 1041 } 1042 1043 name = gctl_get_asciiparam(req, "arg1"); 1044 if (name == NULL) { 1045 gctl_error(req, "No 'arg1' argument"); 1046 return; 1047 } 1048 if (strncmp(name, devpf, 5) == 0) { 1049 name += 5; 1050 } 1051 1052 LIST_FOREACH(cp, &gp->consumer, consumer) { 1053 if (cp->provider != NULL 1054 && strcmp(cp->provider->name, name) == 0) 1055 break; 1056 } 1057 1058 if (cp == NULL) { 1059 gctl_error(req, "Provider %s not found", name); 1060 return; 1061 } 1062 1063 mtx_lock(&sc->sc_mtx); 1064 1065 if (cp->index & MP_BAD) { 1066 gctl_error(req, "Consumer %s is invalid", name); 1067 mtx_unlock(&sc->sc_mtx); 1068 return; 1069 } 1070 1071 /* Here when the consumer is present and in good shape */ 1072 1073 sc->sc_active = cp; 1074 if (!sc->sc_active_active) 1075 printf("GEOM_MULTIPATH: %s now active path in %s\n", 1076 sc->sc_active->provider->name, sc->sc_name); 1077 1078 mtx_unlock(&sc->sc_mtx); 1079 } 1080 1081 static void 1082 g_multipath_ctl_add(struct gctl_req *req, struct g_class *mp) 1083 { 1084 struct g_geom *gp; 1085 const char *mpname, *name; 1086 1087 mpname = gctl_get_asciiparam(req, "arg0"); 1088 if (mpname == NULL) { 1089 gctl_error(req, "No 'arg0' argument"); 1090 return; 1091 } 1092 gp = g_multipath_find_geom(mp, mpname); 1093 if (gp == NULL) { 1094 gctl_error(req, "Device %s not found", mpname); 1095 return; 1096 } 1097 1098 name = gctl_get_asciiparam(req, "arg1"); 1099 if (name == NULL) { 1100 gctl_error(req, "No 'arg1' argument"); 1101 return; 1102 } 1103 g_multipath_ctl_add_name(req, mp, name); 1104 } 1105 1106 static void 1107 g_multipath_ctl_create(struct gctl_req *req, struct g_class *mp) 1108 { 1109 struct g_multipath_metadata md; 1110 struct g_multipath_softc *sc; 1111 struct g_geom *gp; 1112 const char *mpname, *name; 1113 char param[16]; 1114 int *nargs, i, *val; 1115 1116 g_topology_assert(); 1117 1118 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 1119 if (*nargs < 2) { 1120 gctl_error(req, "wrong number of arguments."); 1121 return; 1122 } 1123 1124 mpname = gctl_get_asciiparam(req, "arg0"); 1125 if (mpname == NULL) { 1126 gctl_error(req, "No 'arg0' argument"); 1127 return; 1128 } 1129 gp = g_multipath_find_geom(mp, mpname); 1130 if (gp != NULL) { 1131 gctl_error(req, "Device %s already exist", mpname); 1132 return; 1133 } 1134 1135 memset(&md, 0, sizeof(md)); 1136 strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic)); 1137 md.md_version = G_MULTIPATH_VERSION; 1138 strlcpy(md.md_name, mpname, sizeof(md.md_name)); 1139 md.md_size = 0; 1140 md.md_sectorsize = 0; 1141 md.md_uuid[0] = 0; 1142 md.md_active_active = 0; 1143 val = gctl_get_paraml(req, "active_active", sizeof(*val)); 1144 if (val != NULL && *val != 0) 1145 md.md_active_active = 1; 1146 val = gctl_get_paraml(req, "active_read", sizeof(*val)); 1147 if (val != NULL && *val != 0) 1148 md.md_active_active = 2; 1149 gp = g_multipath_create(mp, &md); 1150 if (gp == NULL) { 1151 gctl_error(req, "GEOM_MULTIPATH: cannot create geom %s/%s\n", 1152 md.md_name, md.md_uuid); 1153 return; 1154 } 1155 sc = gp->softc; 1156 1157 for (i = 1; i < *nargs; i++) { 1158 snprintf(param, sizeof(param), "arg%d", i); 1159 name = gctl_get_asciiparam(req, param); 1160 g_multipath_ctl_add_name(req, mp, name); 1161 } 1162 1163 if (sc->sc_ndisks != (*nargs - 1)) 1164 g_multipath_destroy(gp); 1165 } 1166 1167 static void 1168 g_multipath_ctl_configure(struct gctl_req *req, struct g_class *mp) 1169 { 1170 struct g_multipath_softc *sc; 1171 struct g_geom *gp; 1172 struct g_consumer *cp; 1173 struct g_provider *pp; 1174 struct g_multipath_metadata md; 1175 const char *name; 1176 int error, *val; 1177 1178 g_topology_assert(); 1179 1180 name = gctl_get_asciiparam(req, "arg0"); 1181 if (name == NULL) { 1182 gctl_error(req, "No 'arg0' argument"); 1183 return; 1184 } 1185 gp = g_multipath_find_geom(mp, name); 1186 if (gp == NULL) { 1187 gctl_error(req, "Device %s is invalid", name); 1188 return; 1189 } 1190 sc = gp->softc; 1191 val = gctl_get_paraml(req, "active_active", sizeof(*val)); 1192 if (val != NULL && *val != 0) 1193 sc->sc_active_active = 1; 1194 val = gctl_get_paraml(req, "active_read", sizeof(*val)); 1195 if (val != NULL && *val != 0) 1196 sc->sc_active_active = 2; 1197 val = gctl_get_paraml(req, "active_passive", sizeof(*val)); 1198 if (val != NULL && *val != 0) 1199 sc->sc_active_active = 0; 1200 if (sc->sc_uuid[0] != 0 && sc->sc_active != NULL) { 1201 cp = sc->sc_active; 1202 pp = cp->provider; 1203 strlcpy(md.md_magic, G_MULTIPATH_MAGIC, sizeof(md.md_magic)); 1204 memcpy(md.md_uuid, sc->sc_uuid, sizeof (sc->sc_uuid)); 1205 strlcpy(md.md_name, name, sizeof(md.md_name)); 1206 md.md_version = G_MULTIPATH_VERSION; 1207 md.md_size = pp->mediasize; 1208 md.md_sectorsize = pp->sectorsize; 1209 md.md_active_active = sc->sc_active_active; 1210 error = g_multipath_write_metadata(cp, &md); 1211 if (error != 0) 1212 gctl_error(req, "Can't update metadata on %s (%d)", 1213 pp->name, error); 1214 } 1215 } 1216 1217 static void 1218 g_multipath_ctl_fail(struct gctl_req *req, struct g_class *mp, int fail) 1219 { 1220 struct g_multipath_softc *sc; 1221 struct g_geom *gp; 1222 struct g_consumer *cp; 1223 const char *mpname, *name; 1224 int found; 1225 1226 mpname = gctl_get_asciiparam(req, "arg0"); 1227 if (mpname == NULL) { 1228 gctl_error(req, "No 'arg0' argument"); 1229 return; 1230 } 1231 gp = g_multipath_find_geom(mp, mpname); 1232 if (gp == NULL) { 1233 gctl_error(req, "Device %s not found", mpname); 1234 return; 1235 } 1236 sc = gp->softc; 1237 1238 name = gctl_get_asciiparam(req, "arg1"); 1239 if (name == NULL) { 1240 gctl_error(req, "No 'arg1' argument"); 1241 return; 1242 } 1243 1244 found = 0; 1245 mtx_lock(&sc->sc_mtx); 1246 LIST_FOREACH(cp, &gp->consumer, consumer) { 1247 if (cp->provider != NULL && 1248 strcmp(cp->provider->name, name) == 0 && 1249 (cp->index & MP_LOST) == 0) { 1250 found = 1; 1251 if (!fail == !(cp->index & MP_FAIL)) 1252 continue; 1253 printf("GEOM_MULTIPATH: %s in %s is marked %s.\n", 1254 name, sc->sc_name, fail ? "FAIL" : "OK"); 1255 if (fail) { 1256 g_multipath_fault(cp, MP_FAIL); 1257 SDT_PROBE3(geom, multipath, config, fail, 1258 sc->sc_name, cp->provider->name, 0); 1259 } else { 1260 cp->index &= ~MP_FAIL; 1261 SDT_PROBE2(geom, multipath, config, restore, 1262 sc->sc_name, cp->provider->name); 1263 } 1264 } 1265 } 1266 mtx_unlock(&sc->sc_mtx); 1267 if (found == 0) 1268 gctl_error(req, "Provider %s not found", name); 1269 } 1270 1271 static void 1272 g_multipath_ctl_remove(struct gctl_req *req, struct g_class *mp) 1273 { 1274 struct g_multipath_softc *sc; 1275 struct g_geom *gp; 1276 struct g_consumer *cp, *cp1; 1277 const char *mpname, *name; 1278 uintptr_t *cnt; 1279 int found; 1280 1281 mpname = gctl_get_asciiparam(req, "arg0"); 1282 if (mpname == NULL) { 1283 gctl_error(req, "No 'arg0' argument"); 1284 return; 1285 } 1286 gp = g_multipath_find_geom(mp, mpname); 1287 if (gp == NULL) { 1288 gctl_error(req, "Device %s not found", mpname); 1289 return; 1290 } 1291 sc = gp->softc; 1292 1293 name = gctl_get_asciiparam(req, "arg1"); 1294 if (name == NULL) { 1295 gctl_error(req, "No 'arg1' argument"); 1296 return; 1297 } 1298 1299 found = 0; 1300 mtx_lock(&sc->sc_mtx); 1301 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) { 1302 if (cp->provider != NULL && 1303 strcmp(cp->provider->name, name) == 0 && 1304 (cp->index & MP_LOST) == 0) { 1305 found = 1; 1306 printf("GEOM_MULTIPATH: removing %s from %s\n", 1307 cp->provider->name, cp->geom->name); 1308 SDT_PROBE2(geom, multipath, config, remove, 1309 cp->geom->name, cp->provider->name); 1310 sc->sc_ndisks--; 1311 g_multipath_fault(cp, MP_LOST); 1312 cnt = (uintptr_t *)&cp->private; 1313 if (*cnt == 0 && (cp->index & MP_POSTED) == 0) { 1314 cp->index |= MP_POSTED; 1315 mtx_unlock(&sc->sc_mtx); 1316 g_mpd(cp, 0); 1317 if (cp1 == NULL) 1318 return; /* Recursion happened. */ 1319 mtx_lock(&sc->sc_mtx); 1320 } 1321 } 1322 } 1323 mtx_unlock(&sc->sc_mtx); 1324 if (found == 0) 1325 gctl_error(req, "Provider %s not found", name); 1326 } 1327 1328 static struct g_geom * 1329 g_multipath_find_geom(struct g_class *mp, const char *name) 1330 { 1331 struct g_geom *gp; 1332 struct g_multipath_softc *sc; 1333 1334 LIST_FOREACH(gp, &mp->geom, geom) { 1335 sc = gp->softc; 1336 if (sc == NULL || sc->sc_stopping) 1337 continue; 1338 if (strcmp(gp->name, name) == 0) 1339 return (gp); 1340 } 1341 return (NULL); 1342 } 1343 1344 static void 1345 g_multipath_ctl_stop(struct gctl_req *req, struct g_class *mp) 1346 { 1347 struct g_geom *gp; 1348 const char *name; 1349 int error; 1350 1351 g_topology_assert(); 1352 1353 name = gctl_get_asciiparam(req, "arg0"); 1354 if (name == NULL) { 1355 gctl_error(req, "No 'arg0' argument"); 1356 return; 1357 } 1358 gp = g_multipath_find_geom(mp, name); 1359 if (gp == NULL) { 1360 gctl_error(req, "Device %s is invalid", name); 1361 return; 1362 } 1363 error = g_multipath_destroy(gp); 1364 if (error != 0 && error != EINPROGRESS) 1365 gctl_error(req, "failed to stop %s (err=%d)", name, error); 1366 } 1367 1368 static void 1369 g_multipath_ctl_destroy(struct gctl_req *req, struct g_class *mp) 1370 { 1371 struct g_geom *gp; 1372 struct g_multipath_softc *sc; 1373 struct g_consumer *cp; 1374 struct g_provider *pp; 1375 const char *name; 1376 uint8_t *buf; 1377 int error; 1378 1379 g_topology_assert(); 1380 1381 name = gctl_get_asciiparam(req, "arg0"); 1382 if (name == NULL) { 1383 gctl_error(req, "No 'arg0' argument"); 1384 return; 1385 } 1386 gp = g_multipath_find_geom(mp, name); 1387 if (gp == NULL) { 1388 gctl_error(req, "Device %s is invalid", name); 1389 return; 1390 } 1391 sc = gp->softc; 1392 1393 if (sc->sc_uuid[0] != 0 && sc->sc_active != NULL) { 1394 cp = sc->sc_active; 1395 pp = cp->provider; 1396 error = g_access(cp, 1, 1, 1); 1397 if (error != 0) { 1398 gctl_error(req, "Can't open %s (%d)", pp->name, error); 1399 goto destroy; 1400 } 1401 g_topology_unlock(); 1402 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 1403 error = g_write_data(cp, pp->mediasize - pp->sectorsize, 1404 buf, pp->sectorsize); 1405 g_topology_lock(); 1406 g_access(cp, -1, -1, -1); 1407 if (error != 0) 1408 gctl_error(req, "Can't erase metadata on %s (%d)", 1409 pp->name, error); 1410 } 1411 1412 destroy: 1413 error = g_multipath_destroy(gp); 1414 if (error != 0 && error != EINPROGRESS) 1415 gctl_error(req, "failed to destroy %s (err=%d)", name, error); 1416 } 1417 1418 static void 1419 g_multipath_ctl_rotate(struct gctl_req *req, struct g_class *mp) 1420 { 1421 struct g_geom *gp; 1422 const char *name; 1423 int error; 1424 1425 g_topology_assert(); 1426 1427 name = gctl_get_asciiparam(req, "arg0"); 1428 if (name == NULL) { 1429 gctl_error(req, "No 'arg0' argument"); 1430 return; 1431 } 1432 gp = g_multipath_find_geom(mp, name); 1433 if (gp == NULL) { 1434 gctl_error(req, "Device %s is invalid", name); 1435 return; 1436 } 1437 error = g_multipath_rotate(gp); 1438 if (error != 0) { 1439 gctl_error(req, "failed to rotate %s (err=%d)", name, error); 1440 } 1441 } 1442 1443 static void 1444 g_multipath_ctl_getactive(struct gctl_req *req, struct g_class *mp) 1445 { 1446 struct sbuf *sb; 1447 struct g_geom *gp; 1448 struct g_multipath_softc *sc; 1449 struct g_consumer *cp; 1450 const char *name; 1451 int empty; 1452 1453 sb = sbuf_new_auto(); 1454 1455 g_topology_assert(); 1456 name = gctl_get_asciiparam(req, "arg0"); 1457 if (name == NULL) { 1458 gctl_error(req, "No 'arg0' argument"); 1459 return; 1460 } 1461 gp = g_multipath_find_geom(mp, name); 1462 if (gp == NULL) { 1463 gctl_error(req, "Device %s is invalid", name); 1464 return; 1465 } 1466 sc = gp->softc; 1467 if (sc->sc_active_active == 1) { 1468 empty = 1; 1469 LIST_FOREACH(cp, &gp->consumer, consumer) { 1470 if (cp->index & MP_BAD) 1471 continue; 1472 if (!empty) 1473 sbuf_cat(sb, " "); 1474 sbuf_cat(sb, cp->provider->name); 1475 empty = 0; 1476 } 1477 if (empty) 1478 sbuf_cat(sb, "none"); 1479 sbuf_cat(sb, "\n"); 1480 } else if (sc->sc_active && sc->sc_active->provider) { 1481 sbuf_printf(sb, "%s\n", sc->sc_active->provider->name); 1482 } else { 1483 sbuf_cat(sb, "none\n"); 1484 } 1485 sbuf_finish(sb); 1486 gctl_set_param_err(req, "output", sbuf_data(sb), sbuf_len(sb) + 1); 1487 sbuf_delete(sb); 1488 } 1489 1490 static void 1491 g_multipath_config(struct gctl_req *req, struct g_class *mp, const char *verb) 1492 { 1493 uint32_t *version; 1494 g_topology_assert(); 1495 version = gctl_get_paraml(req, "version", sizeof(*version)); 1496 if (version == NULL) { 1497 gctl_error(req, "No 'version' argument"); 1498 } else if (*version != G_MULTIPATH_VERSION) { 1499 gctl_error(req, "Userland and kernel parts are out of sync"); 1500 } else if (strcmp(verb, "add") == 0) { 1501 g_multipath_ctl_add(req, mp); 1502 } else if (strcmp(verb, "prefer") == 0) { 1503 g_multipath_ctl_prefer(req, mp); 1504 } else if (strcmp(verb, "create") == 0) { 1505 g_multipath_ctl_create(req, mp); 1506 } else if (strcmp(verb, "configure") == 0) { 1507 g_multipath_ctl_configure(req, mp); 1508 } else if (strcmp(verb, "stop") == 0) { 1509 g_multipath_ctl_stop(req, mp); 1510 } else if (strcmp(verb, "destroy") == 0) { 1511 g_multipath_ctl_destroy(req, mp); 1512 } else if (strcmp(verb, "fail") == 0) { 1513 g_multipath_ctl_fail(req, mp, 1); 1514 } else if (strcmp(verb, "restore") == 0) { 1515 g_multipath_ctl_fail(req, mp, 0); 1516 } else if (strcmp(verb, "remove") == 0) { 1517 g_multipath_ctl_remove(req, mp); 1518 } else if (strcmp(verb, "rotate") == 0) { 1519 g_multipath_ctl_rotate(req, mp); 1520 } else if (strcmp(verb, "getactive") == 0) { 1521 g_multipath_ctl_getactive(req, mp); 1522 } else { 1523 gctl_error(req, "Unknown verb %s", verb); 1524 } 1525 } 1526 1527 static void 1528 g_multipath_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1529 struct g_consumer *cp, struct g_provider *pp) 1530 { 1531 struct g_multipath_softc *sc; 1532 int good; 1533 1534 g_topology_assert(); 1535 1536 sc = gp->softc; 1537 if (sc == NULL) 1538 return; 1539 if (cp != NULL) { 1540 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1541 (cp->index & MP_NEW) ? "NEW" : 1542 (cp->index & MP_LOST) ? "LOST" : 1543 (cp->index & MP_FAIL) ? "FAIL" : 1544 (sc->sc_active_active == 1 || sc->sc_active == cp) ? 1545 "ACTIVE" : 1546 sc->sc_active_active == 2 ? "READ" : "PASSIVE"); 1547 } else { 1548 good = g_multipath_good(gp); 1549 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1550 good == 0 ? "BROKEN" : 1551 (good != sc->sc_ndisks || sc->sc_ndisks == 1) ? 1552 "DEGRADED" : "OPTIMAL"); 1553 } 1554 if (cp == NULL && pp == NULL) { 1555 sbuf_printf(sb, "%s<UUID>%s</UUID>\n", indent, sc->sc_uuid); 1556 sbuf_printf(sb, "%s<Mode>Active/%s</Mode>\n", indent, 1557 sc->sc_active_active == 2 ? "Read" : 1558 sc->sc_active_active == 1 ? "Active" : "Passive"); 1559 sbuf_printf(sb, "%s<Type>%s</Type>\n", indent, 1560 sc->sc_uuid[0] == 0 ? "MANUAL" : "AUTOMATIC"); 1561 } 1562 } 1563 1564 DECLARE_GEOM_CLASS(g_multipath_class, g_multipath); 1565 MODULE_VERSION(geom_multipath, 0); 1566