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