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 g_std_done(bp); 398 } 399 } 400 401 static void 402 g_multipath_done_error(struct bio *bp) 403 { 404 struct bio *pbp; 405 struct g_geom *gp; 406 struct g_multipath_softc *sc; 407 struct g_consumer *cp; 408 struct g_provider *pp; 409 uintptr_t *cnt; 410 411 /* 412 * If we had a failure, we have to check first to see 413 * whether the consumer it failed on was the currently 414 * active consumer (i.e., this is the first in perhaps 415 * a number of failures). If so, we then switch consumers 416 * to the next available consumer. 417 */ 418 419 pbp = bp->bio_parent; 420 gp = pbp->bio_to->geom; 421 sc = gp->softc; 422 cp = bp->bio_from; 423 pp = cp->provider; 424 cnt = (uintptr_t *)&cp->private; 425 426 mtx_lock(&sc->sc_mtx); 427 if ((cp->index & MP_FAIL) == 0) { 428 printf("GEOM_MULTIPATH: Error %d, %s in %s marked FAIL\n", 429 bp->bio_error, pp->name, sc->sc_name); 430 SDT_PROBE3(geom, multipath, config, fail, 431 sc->sc_name, pp->name, bp->bio_error); 432 g_multipath_fault(cp, MP_FAIL); 433 } 434 (*cnt)--; 435 if (*cnt == 0 && (cp->index & (MP_LOST | MP_POSTED)) == MP_LOST) { 436 cp->index |= MP_POSTED; 437 mtx_unlock(&sc->sc_mtx); 438 g_post_event(g_mpd, cp, M_WAITOK, NULL); 439 } else 440 mtx_unlock(&sc->sc_mtx); 441 442 /* 443 * If we can fruitfully restart the I/O, do so. 444 */ 445 if (pbp->bio_children < (uintptr_t)pbp->bio_driver1) { 446 pbp->bio_inbed++; 447 SDT_PROBE2(geom, multipath, io, restart, bp, pbp); 448 g_destroy_bio(bp); 449 g_multipath_start(pbp); 450 } else { 451 g_std_done(bp); 452 } 453 } 454 455 static void 456 g_multipath_kt(void *arg) 457 { 458 459 g_multipath_kt_state = GKT_RUN; 460 mtx_lock(&gmtbq_mtx); 461 while (g_multipath_kt_state == GKT_RUN) { 462 for (;;) { 463 struct bio *bp; 464 465 bp = bioq_takefirst(&gmtbq); 466 if (bp == NULL) 467 break; 468 mtx_unlock(&gmtbq_mtx); 469 g_multipath_done_error(bp); 470 mtx_lock(&gmtbq_mtx); 471 } 472 if (g_multipath_kt_state != GKT_RUN) 473 break; 474 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 475 "gkt:wait", 0); 476 } 477 mtx_unlock(&gmtbq_mtx); 478 wakeup(&g_multipath_kt_state); 479 kproc_exit(0); 480 } 481 482 483 static int 484 g_multipath_access(struct g_provider *pp, int dr, int dw, int de) 485 { 486 struct g_geom *gp; 487 struct g_consumer *cp, *badcp = NULL; 488 struct g_multipath_softc *sc; 489 int error; 490 491 gp = pp->geom; 492 493 /* Error used if we have no valid consumers. */ 494 error = (dr > 0 || dw > 0 || de > 0) ? ENXIO : 0; 495 496 LIST_FOREACH(cp, &gp->consumer, consumer) { 497 if (cp->index & MP_WITHER) 498 continue; 499 500 error = g_access(cp, dr, dw, de); 501 if (error) { 502 badcp = cp; 503 goto fail; 504 } 505 } 506 507 if (error != 0) 508 return (error); 509 510 sc = gp->softc; 511 sc->sc_opened += dr + dw + de; 512 if (sc->sc_stopping && sc->sc_opened == 0) 513 g_multipath_destroy(gp); 514 515 return (0); 516 517 fail: 518 LIST_FOREACH(cp, &gp->consumer, consumer) { 519 if (cp == badcp) 520 break; 521 if (cp->index & MP_WITHER) 522 continue; 523 524 (void) g_access(cp, -dr, -dw, -de); 525 } 526 return (error); 527 } 528 529 static struct g_geom * 530 g_multipath_create(struct g_class *mp, struct g_multipath_metadata *md) 531 { 532 struct g_multipath_softc *sc; 533 struct g_geom *gp; 534 struct g_provider *pp; 535 536 g_topology_assert(); 537 538 LIST_FOREACH(gp, &mp->geom, geom) { 539 sc = gp->softc; 540 if (sc == NULL || sc->sc_stopping) 541 continue; 542 if (strcmp(gp->name, md->md_name) == 0) { 543 printf("GEOM_MULTIPATH: name %s already exists\n", 544 md->md_name); 545 return (NULL); 546 } 547 } 548 549 gp = g_new_geomf(mp, "%s", md->md_name); 550 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 551 mtx_init(&sc->sc_mtx, "multipath", NULL, MTX_DEF); 552 memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid)); 553 memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name)); 554 sc->sc_active_active = md->md_active_active; 555 sc->sc_size = md->md_size; 556 gp->softc = sc; 557 gp->start = g_multipath_start; 558 gp->orphan = g_multipath_orphan; 559 gp->resize = g_multipath_resize; 560 gp->access = g_multipath_access; 561 gp->dumpconf = g_multipath_dumpconf; 562 563 pp = g_new_providerf(gp, "multipath/%s", md->md_name); 564 pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 565 if (md->md_size != 0) { 566 pp->mediasize = md->md_size - 567 ((md->md_uuid[0] != 0) ? md->md_sectorsize : 0); 568 pp->sectorsize = md->md_sectorsize; 569 } 570 sc->sc_pp = pp; 571 g_error_provider(pp, 0); 572 printf("GEOM_MULTIPATH: %s created\n", gp->name); 573 return (gp); 574 } 575 576 static int 577 g_multipath_add_disk(struct g_geom *gp, struct g_provider *pp) 578 { 579 struct g_multipath_softc *sc; 580 struct g_consumer *cp, *nxtcp; 581 int error, acr, acw, ace; 582 583 g_topology_assert(); 584 585 sc = gp->softc; 586 KASSERT(sc, ("no softc")); 587 588 /* 589 * Make sure that the passed provider isn't already attached 590 */ 591 LIST_FOREACH(cp, &gp->consumer, consumer) { 592 if (cp->provider == pp) 593 break; 594 } 595 if (cp) { 596 printf("GEOM_MULTIPATH: provider %s already attached to %s\n", 597 pp->name, gp->name); 598 return (EEXIST); 599 } 600 nxtcp = LIST_FIRST(&gp->consumer); 601 cp = g_new_consumer(gp); 602 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 603 cp->private = NULL; 604 cp->index = MP_NEW; 605 error = g_attach(cp, pp); 606 if (error != 0) { 607 printf("GEOM_MULTIPATH: cannot attach %s to %s", 608 pp->name, sc->sc_name); 609 g_destroy_consumer(cp); 610 return (error); 611 } 612 613 /* 614 * Set access permissions on new consumer to match other consumers 615 */ 616 if (sc->sc_pp) { 617 acr = sc->sc_pp->acr; 618 acw = sc->sc_pp->acw; 619 ace = sc->sc_pp->ace; 620 } else 621 acr = acw = ace = 0; 622 if (g_multipath_exclusive) { 623 acr++; 624 acw++; 625 ace++; 626 } 627 error = g_access(cp, acr, acw, ace); 628 if (error) { 629 printf("GEOM_MULTIPATH: cannot set access in " 630 "attaching %s to %s (%d)\n", 631 pp->name, sc->sc_name, error); 632 g_detach(cp); 633 g_destroy_consumer(cp); 634 return (error); 635 } 636 if (sc->sc_size == 0) { 637 sc->sc_size = pp->mediasize - 638 ((sc->sc_uuid[0] != 0) ? pp->sectorsize : 0); 639 sc->sc_pp->mediasize = sc->sc_size; 640 sc->sc_pp->sectorsize = pp->sectorsize; 641 } 642 if (sc->sc_pp->stripesize == 0 && sc->sc_pp->stripeoffset == 0) { 643 sc->sc_pp->stripesize = pp->stripesize; 644 sc->sc_pp->stripeoffset = pp->stripeoffset; 645 } 646 sc->sc_pp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED; 647 mtx_lock(&sc->sc_mtx); 648 cp->index = 0; 649 sc->sc_ndisks++; 650 mtx_unlock(&sc->sc_mtx); 651 printf("GEOM_MULTIPATH: %s added to %s\n", 652 pp->name, sc->sc_name); 653 if (sc->sc_active == NULL) { 654 sc->sc_active = cp; 655 if (sc->sc_active_active != 1) 656 printf("GEOM_MULTIPATH: %s is now active path in %s\n", 657 pp->name, sc->sc_name); 658 } 659 return (0); 660 } 661 662 static int 663 g_multipath_destroy(struct g_geom *gp) 664 { 665 struct g_multipath_softc *sc; 666 struct g_consumer *cp, *cp1; 667 668 g_topology_assert(); 669 if (gp->softc == NULL) 670 return (ENXIO); 671 sc = gp->softc; 672 if (!sc->sc_stopping) { 673 printf("GEOM_MULTIPATH: destroying %s\n", gp->name); 674 sc->sc_stopping = 1; 675 } 676 if (sc->sc_opened != 0) { 677 g_wither_provider(sc->sc_pp, ENXIO); 678 sc->sc_pp = NULL; 679 return (EINPROGRESS); 680 } 681 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp1) { 682 mtx_lock(&sc->sc_mtx); 683 if ((cp->index & MP_POSTED) == 0) { 684 cp->index |= MP_POSTED; 685 mtx_unlock(&sc->sc_mtx); 686 g_mpd(cp, 0); 687 if (cp1 == NULL) 688 return(0); /* Recursion happened. */ 689 } else 690 mtx_unlock(&sc->sc_mtx); 691 } 692 if (!LIST_EMPTY(&gp->consumer)) 693 return (EINPROGRESS); 694 mtx_destroy(&sc->sc_mtx); 695 g_free(gp->softc); 696 gp->softc = NULL; 697 printf("GEOM_MULTIPATH: %s destroyed\n", gp->name); 698 g_wither_geom(gp, ENXIO); 699 return (0); 700 } 701 702 static int 703 g_multipath_destroy_geom(struct gctl_req *req, struct g_class *mp, 704 struct g_geom *gp) 705 { 706 707 return (g_multipath_destroy(gp)); 708 } 709 710 static int 711 g_multipath_rotate(struct g_geom *gp) 712 { 713 struct g_consumer *lcp, *first_good_cp = NULL; 714 struct g_multipath_softc *sc = gp->softc; 715 int active_cp_seen = 0; 716 717 g_topology_assert(); 718 if (sc == NULL) 719 return (ENXIO); 720 LIST_FOREACH(lcp, &gp->consumer, consumer) { 721 if ((lcp->index & MP_BAD) == 0) { 722 if (first_good_cp == NULL) 723 first_good_cp = lcp; 724 if (active_cp_seen) 725 break; 726 } 727 if (sc->sc_active == lcp) 728 active_cp_seen = 1; 729 } 730 if (lcp == NULL) 731 lcp = first_good_cp; 732 if (lcp && lcp != sc->sc_active) { 733 sc->sc_active = lcp; 734 if (sc->sc_active_active != 1) 735 printf("GEOM_MULTIPATH: %s is now active path in %s\n", 736 lcp->provider->name, sc->sc_name); 737 } 738 return (0); 739 } 740 741 static void 742 g_multipath_init(struct g_class *mp) 743 { 744 bioq_init(&gmtbq); 745 mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF); 746 kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt"); 747 } 748 749 static void 750 g_multipath_fini(struct g_class *mp) 751 { 752 if (g_multipath_kt_state == GKT_RUN) { 753 mtx_lock(&gmtbq_mtx); 754 g_multipath_kt_state = GKT_DIE; 755 wakeup(&g_multipath_kt_state); 756 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 757 "gmp:fini", 0); 758 mtx_unlock(&gmtbq_mtx); 759 } 760 } 761 762 static int 763 g_multipath_read_metadata(struct g_consumer *cp, 764 struct g_multipath_metadata *md) 765 { 766 struct g_provider *pp; 767 u_char *buf; 768 int error; 769 770 g_topology_assert(); 771 error = g_access(cp, 1, 0, 0); 772 if (error != 0) 773 return (error); 774 pp = cp->provider; 775 g_topology_unlock(); 776 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, 777 pp->sectorsize, &error); 778 g_topology_lock(); 779 g_access(cp, -1, 0, 0); 780 if (buf == NULL) 781 return (error); 782 multipath_metadata_decode(buf, md); 783 g_free(buf); 784 return (0); 785 } 786 787 static int 788 g_multipath_write_metadata(struct g_consumer *cp, 789 struct g_multipath_metadata *md) 790 { 791 struct g_provider *pp; 792 u_char *buf; 793 int error; 794 795 g_topology_assert(); 796 error = g_access(cp, 1, 1, 1); 797 if (error != 0) 798 return (error); 799 pp = cp->provider; 800 g_topology_unlock(); 801 buf = g_malloc(pp->sectorsize, M_WAITOK | M_ZERO); 802 multipath_metadata_encode(md, buf); 803 error = g_write_data(cp, pp->mediasize - pp->sectorsize, 804 buf, pp->sectorsize); 805 g_topology_lock(); 806 g_access(cp, -1, -1, -1); 807 g_free(buf); 808 return (error); 809 } 810 811 static struct g_geom * 812 g_multipath_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 813 { 814 struct g_multipath_metadata md; 815 struct g_multipath_softc *sc; 816 struct g_consumer *cp; 817 struct g_geom *gp, *gp1; 818 int error, isnew; 819 820 g_topology_assert(); 821 822 gp = g_new_geomf(mp, "multipath:taste"); 823 gp->start = g_multipath_start; 824 gp->access = g_multipath_access; 825 gp->orphan = g_multipath_orphan; 826 cp = g_new_consumer(gp); 827 g_attach(cp, pp); 828 error = g_multipath_read_metadata(cp, &md); 829 g_detach(cp); 830 g_destroy_consumer(cp); 831 g_destroy_geom(gp); 832 if (error != 0) 833 return (NULL); 834 gp = NULL; 835 836 if (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) { 837 if (g_multipath_debug) 838 printf("%s is not MULTIPATH\n", pp->name); 839 return (NULL); 840 } 841 if (md.md_version != G_MULTIPATH_VERSION) { 842 printf("%s has version %d multipath id- this module is version " 843 " %d: rejecting\n", pp->name, md.md_version, 844 G_MULTIPATH_VERSION); 845 return (NULL); 846 } 847 if (md.md_size != 0 && md.md_size != pp->mediasize) 848 return (NULL); 849 if (md.md_sectorsize != 0 && md.md_sectorsize != pp->sectorsize) 850 return (NULL); 851 if (g_multipath_debug) 852 printf("MULTIPATH: %s/%s\n", md.md_name, md.md_uuid); 853 SDT_PROBE2(geom, multipath, config, taste, md.md_name, md.md_uuid); 854 855 /* 856 * Let's check if such a device already is present. We check against 857 * uuid alone first because that's the true distinguishor. If that 858 * passes, then we check for name conflicts. If there are conflicts, 859 * modify the name. 860 * 861 * The whole purpose of this is to solve the problem that people don't 862 * pick good unique names, but good unique names (like uuids) are a 863 * pain to use. So, we allow people to build GEOMs with friendly names 864 * and uuids, and modify the names in case there's a collision. 865 */ 866 sc = NULL; 867 LIST_FOREACH(gp, &mp->geom, geom) { 868 sc = gp->softc; 869 if (sc == NULL || sc->sc_stopping) 870 continue; 871 if (strncmp(md.md_uuid, sc->sc_uuid, sizeof(md.md_uuid)) == 0) 872 break; 873 } 874 875 LIST_FOREACH(gp1, &mp->geom, geom) { 876 if (gp1 == gp) 877 continue; 878 sc = gp1->softc; 879 if (sc == NULL || sc->sc_stopping) 880 continue; 881 if (strncmp(md.md_name, sc->sc_name, sizeof(md.md_name)) == 0) 882 break; 883 } 884 885 /* 886 * If gp is NULL, we had no extant MULTIPATH geom with this uuid. 887 * 888 * If gp1 is *not* NULL, that means we have a MULTIPATH geom extant 889 * with the same name (but a different UUID). 890 * 891 * If gp is NULL, then modify the name with a random number and 892 * complain, but allow the creation of the geom to continue. 893 * 894 * If gp is *not* NULL, just use the geom's name as we're attaching 895 * this disk to the (previously generated) name. 896 */ 897 898 if (gp1) { 899 sc = gp1->softc; 900 if (gp == NULL) { 901 char buf[16]; 902 u_long rand = random(); 903 904 snprintf(buf, sizeof (buf), "%s-%lu", md.md_name, rand); 905 printf("GEOM_MULTIPATH: geom %s/%s exists already\n", 906 sc->sc_name, sc->sc_uuid); 907 printf("GEOM_MULTIPATH: %s will be (temporarily) %s\n", 908 md.md_uuid, buf); 909 strlcpy(md.md_name, buf, sizeof(md.md_name)); 910 } else { 911 strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name)); 912 } 913 } 914 915 if (gp == NULL) { 916 gp = g_multipath_create(mp, &md); 917 if (gp == NULL) { 918 printf("GEOM_MULTIPATH: cannot create geom %s/%s\n", 919 md.md_name, md.md_uuid); 920 return (NULL); 921 } 922 isnew = 1; 923 } else { 924 isnew = 0; 925 } 926 927 sc = gp->softc; 928 KASSERT(sc != NULL, ("sc is NULL")); 929 error = g_multipath_add_disk(gp, pp); 930 if (error != 0) { 931 if (isnew) 932 g_multipath_destroy(gp); 933 return (NULL); 934 } 935 return (gp); 936 } 937 938 static void 939 g_multipath_ctl_add_name(struct gctl_req *req, struct g_class *mp, 940 const char *name) 941 { 942 struct g_multipath_softc *sc; 943 struct g_geom *gp; 944 struct g_consumer *cp; 945 struct g_provider *pp; 946 const char *mpname; 947 static const char devpf[6] = _PATH_DEV; 948 int error; 949 950 g_topology_assert(); 951 952 mpname = gctl_get_asciiparam(req, "arg0"); 953 if (mpname == NULL) { 954 gctl_error(req, "No 'arg0' argument"); 955 return; 956 } 957 gp = g_multipath_find_geom(mp, mpname); 958 if (gp == NULL) { 959 gctl_error(req, "Device %s is invalid", mpname); 960 return; 961 } 962 sc = gp->softc; 963 964 if (strncmp(name, devpf, 5) == 0) 965 name += 5; 966 pp = g_provider_by_name(name); 967 if (pp == NULL) { 968 gctl_error(req, "Provider %s is invalid", name); 969 return; 970 } 971 972 /* 973 * Check to make sure parameters match. 974 */ 975 LIST_FOREACH(cp, &gp->consumer, consumer) { 976 if (cp->provider == pp) { 977 gctl_error(req, "provider %s is already there", 978 pp->name); 979 return; 980 } 981 } 982 if (sc->sc_pp->mediasize != 0 && 983 sc->sc_pp->mediasize + (sc->sc_uuid[0] != 0 ? pp->sectorsize : 0) 984 != pp->mediasize) { 985 gctl_error(req, "Providers size mismatch %jd != %jd", 986 (intmax_t) sc->sc_pp->mediasize + 987 (sc->sc_uuid[0] != 0 ? pp->sectorsize : 0), 988 (intmax_t) pp->mediasize); 989 return; 990 } 991 if (sc->sc_pp->sectorsize != 0 && 992 sc->sc_pp->sectorsize != pp->sectorsize) { 993 gctl_error(req, "Providers sectorsize mismatch %u != %u", 994 sc->sc_pp->sectorsize, pp->sectorsize); 995 return; 996 } 997 998 error = g_multipath_add_disk(gp, pp); 999 if (error != 0) 1000 gctl_error(req, "Provider addition error: %d", error); 1001 } 1002 1003 static void 1004 g_multipath_ctl_prefer(struct gctl_req *req, struct g_class *mp) 1005 { 1006 struct g_geom *gp; 1007 struct g_multipath_softc *sc; 1008 struct g_consumer *cp; 1009 const char *name, *mpname; 1010 static const char devpf[6] = _PATH_DEV; 1011 int *nargs; 1012 1013 g_topology_assert(); 1014 1015 mpname = gctl_get_asciiparam(req, "arg0"); 1016 if (mpname == NULL) { 1017 gctl_error(req, "No 'arg0' argument"); 1018 return; 1019 } 1020 gp = g_multipath_find_geom(mp, mpname); 1021 if (gp == NULL) { 1022 gctl_error(req, "Device %s is invalid", mpname); 1023 return; 1024 } 1025 sc = gp->softc; 1026 1027 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 1028 if (nargs == NULL) { 1029 gctl_error(req, "No 'nargs' argument"); 1030 return; 1031 } 1032 if (*nargs != 2) { 1033 gctl_error(req, "missing device"); 1034 return; 1035 } 1036 1037 name = gctl_get_asciiparam(req, "arg1"); 1038 if (name == NULL) { 1039 gctl_error(req, "No 'arg1' argument"); 1040 return; 1041 } 1042 if (strncmp(name, devpf, 5) == 0) { 1043 name += 5; 1044 } 1045 1046 LIST_FOREACH(cp, &gp->consumer, consumer) { 1047 if (cp->provider != NULL 1048 && strcmp(cp->provider->name, name) == 0) 1049 break; 1050 } 1051 1052 if (cp == NULL) { 1053 gctl_error(req, "Provider %s not found", name); 1054 return; 1055 } 1056 1057 mtx_lock(&sc->sc_mtx); 1058 1059 if (cp->index & MP_BAD) { 1060 gctl_error(req, "Consumer %s is invalid", name); 1061 mtx_unlock(&sc->sc_mtx); 1062 return; 1063 } 1064 1065 /* Here when the consumer is present and in good shape */ 1066 1067 sc->sc_active = cp; 1068 if (!sc->sc_active_active) 1069 printf("GEOM_MULTIPATH: %s now active path in %s\n", 1070 sc->sc_active->provider->name, sc->sc_name); 1071 1072 mtx_unlock(&sc->sc_mtx); 1073 } 1074 1075 static void 1076 g_multipath_ctl_add(struct gctl_req *req, struct g_class *mp) 1077 { 1078 struct g_multipath_softc *sc; 1079 struct g_geom *gp; 1080 const char *mpname, *name; 1081 1082 mpname = gctl_get_asciiparam(req, "arg0"); 1083 if (mpname == NULL) { 1084 gctl_error(req, "No 'arg0' argument"); 1085 return; 1086 } 1087 gp = g_multipath_find_geom(mp, mpname); 1088 if (gp == NULL) { 1089 gctl_error(req, "Device %s not found", mpname); 1090 return; 1091 } 1092 sc = gp->softc; 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