1 /*- 2 * Copyright (c) 2006-2007 Matthew Jacob <mjacob@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 /* 27 * Based upon work by Pawel Jakub Dawidek <pjd@FreeBSD.org> for all of the 28 * fine geom examples, and by Poul Henning Kamp <phk@FreeBSD.org> for GEOM 29 * itself, all of which is most gratefully acknowledged. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/bio.h> 41 #include <sys/sbuf.h> 42 #include <sys/sysctl.h> 43 #include <sys/kthread.h> 44 #include <sys/malloc.h> 45 #include <geom/geom.h> 46 #include <geom/multipath/g_multipath.h> 47 48 FEATURE(geom_multipath, "GEOM multipath support"); 49 50 SYSCTL_DECL(_kern_geom); 51 static SYSCTL_NODE(_kern_geom, OID_AUTO, multipath, CTLFLAG_RW, 0, 52 "GEOM_MULTIPATH tunables"); 53 static u_int g_multipath_debug = 0; 54 SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, debug, CTLFLAG_RW, 55 &g_multipath_debug, 0, "Debug level"); 56 57 static enum { 58 GKT_NIL, 59 GKT_RUN, 60 GKT_DIE 61 } g_multipath_kt_state; 62 static struct bio_queue_head gmtbq; 63 static struct mtx gmtbq_mtx; 64 65 static void g_multipath_orphan(struct g_consumer *); 66 static void g_multipath_start(struct bio *); 67 static void g_multipath_done(struct bio *); 68 static void g_multipath_done_error(struct bio *); 69 static void g_multipath_kt(void *); 70 71 static int g_multipath_destroy(struct g_geom *); 72 static int 73 g_multipath_destroy_geom(struct gctl_req *, struct g_class *, struct g_geom *); 74 75 static struct g_geom *g_multipath_find_geom(struct g_class *, const char *); 76 static int g_multipath_rotate(struct g_geom *); 77 78 static g_taste_t g_multipath_taste; 79 static g_ctl_req_t g_multipath_config; 80 static g_init_t g_multipath_init; 81 static g_fini_t g_multipath_fini; 82 83 struct g_class g_multipath_class = { 84 .name = G_MULTIPATH_CLASS_NAME, 85 .version = G_VERSION, 86 .ctlreq = g_multipath_config, 87 .taste = g_multipath_taste, 88 .destroy_geom = g_multipath_destroy_geom, 89 .init = g_multipath_init, 90 .fini = g_multipath_fini 91 }; 92 93 #define MP_BAD 0x1 94 #define MP_POSTED 0x2 95 96 static void 97 g_mpd(void *arg, int flags __unused) 98 { 99 struct g_consumer *cp; 100 101 g_topology_assert(); 102 cp = arg; 103 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 104 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 105 if (cp->provider) { 106 printf("GEOM_MULTIPATH: %s removed from %s\n", 107 cp->provider->name, cp->geom->name); 108 g_detach(cp); 109 } 110 g_destroy_consumer(cp); 111 } 112 113 static void 114 g_multipath_orphan(struct g_consumer *cp) 115 { 116 if ((cp->index & MP_POSTED) == 0) { 117 cp->index |= MP_POSTED; 118 printf("GEOM_MULTIPATH: %s orphaned in %s\n", 119 cp->provider->name, cp->geom->name); 120 g_mpd(cp, 0); 121 } 122 } 123 124 static void 125 g_multipath_start(struct bio *bp) 126 { 127 struct g_multipath_softc *sc; 128 struct g_geom *gp; 129 struct g_consumer *cp; 130 struct bio *cbp; 131 132 gp = bp->bio_to->geom; 133 sc = gp->softc; 134 KASSERT(sc != NULL, ("NULL sc")); 135 cp = sc->cp_active; 136 if (cp == NULL) { 137 g_io_deliver(bp, ENXIO); 138 return; 139 } 140 cbp = g_clone_bio(bp); 141 if (cbp == NULL) { 142 g_io_deliver(bp, ENOMEM); 143 return; 144 } 145 cbp->bio_done = g_multipath_done; 146 g_io_request(cbp, cp); 147 } 148 149 static void 150 g_multipath_done(struct bio *bp) 151 { 152 if (bp->bio_error == ENXIO || bp->bio_error == EIO) { 153 mtx_lock(&gmtbq_mtx); 154 bioq_insert_tail(&gmtbq, bp); 155 wakeup(&g_multipath_kt_state); 156 mtx_unlock(&gmtbq_mtx); 157 } else { 158 g_std_done(bp); 159 } 160 } 161 162 static void 163 g_multipath_done_error(struct bio *bp) 164 { 165 struct bio *pbp; 166 struct g_geom *gp; 167 struct g_multipath_softc *sc; 168 struct g_consumer *cp; 169 struct g_provider *pp; 170 171 /* 172 * If we had a failure, we have to check first to see 173 * whether the consumer it failed on was the currently 174 * active consumer (i.e., this is the first in perhaps 175 * a number of failures). If so, we then switch consumers 176 * to the next available consumer. 177 */ 178 179 g_topology_lock(); 180 pbp = bp->bio_parent; 181 gp = pbp->bio_to->geom; 182 sc = gp->softc; 183 cp = bp->bio_from; 184 pp = cp->provider; 185 186 cp->index |= MP_BAD; 187 if (cp->nend == cp->nstart && pp->nend == pp->nstart) { 188 cp->index |= MP_POSTED; 189 g_post_event(g_mpd, cp, M_NOWAIT, NULL); 190 } 191 if (cp == sc->cp_active) { 192 struct g_consumer *lcp; 193 printf("GEOM_MULTIPATH: %s failed in %s\n", 194 pp->name, sc->sc_name); 195 sc->cp_active = NULL; 196 LIST_FOREACH(lcp, &gp->consumer, consumer) { 197 if ((lcp->index & MP_BAD) == 0) { 198 sc->cp_active = lcp; 199 break; 200 } 201 } 202 if (sc->cp_active == NULL || sc->cp_active->provider == NULL) { 203 printf("GEOM_MULTIPATH: out of providers for %s\n", 204 sc->sc_name); 205 g_topology_unlock(); 206 return; 207 } else { 208 printf("GEOM_MULTIPATH: %s now active path in %s\n", 209 sc->cp_active->provider->name, sc->sc_name); 210 } 211 } 212 g_topology_unlock(); 213 214 /* 215 * If we can fruitfully restart the I/O, do so. 216 */ 217 if (sc->cp_active) { 218 g_destroy_bio(bp); 219 pbp->bio_children--; 220 g_multipath_start(pbp); 221 } else { 222 g_std_done(bp); 223 } 224 } 225 226 static void 227 g_multipath_kt(void *arg) 228 { 229 230 g_multipath_kt_state = GKT_RUN; 231 mtx_lock(&gmtbq_mtx); 232 while (g_multipath_kt_state == GKT_RUN) { 233 for (;;) { 234 struct bio *bp; 235 236 bp = bioq_takefirst(&gmtbq); 237 if (bp == NULL) 238 break; 239 mtx_unlock(&gmtbq_mtx); 240 g_multipath_done_error(bp); 241 mtx_lock(&gmtbq_mtx); 242 } 243 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 244 "gkt:wait", hz / 10); 245 } 246 mtx_unlock(&gmtbq_mtx); 247 wakeup(&g_multipath_kt_state); 248 kproc_exit(0); 249 } 250 251 252 static int 253 g_multipath_access(struct g_provider *pp, int dr, int dw, int de) 254 { 255 struct g_geom *gp; 256 struct g_consumer *cp, *badcp = NULL; 257 int error; 258 259 gp = pp->geom; 260 261 LIST_FOREACH(cp, &gp->consumer, consumer) { 262 error = g_access(cp, dr, dw, de); 263 if (error) { 264 badcp = cp; 265 goto fail; 266 } 267 } 268 return (0); 269 270 fail: 271 LIST_FOREACH(cp, &gp->consumer, consumer) { 272 if (cp == badcp) 273 break; 274 (void) g_access(cp, -dr, -dw, -de); 275 } 276 return (error); 277 } 278 279 static struct g_geom * 280 g_multipath_create(struct g_class *mp, struct g_multipath_metadata *md) 281 { 282 struct g_multipath_softc *sc; 283 struct g_geom *gp; 284 struct g_provider *pp; 285 286 g_topology_assert(); 287 288 LIST_FOREACH(gp, &mp->geom, geom) { 289 if (strcmp(gp->name, md->md_name) == 0) { 290 printf("GEOM_MULTIPATH: name %s already exists\n", 291 md->md_name); 292 return (NULL); 293 } 294 } 295 296 gp = g_new_geomf(mp, md->md_name); 297 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 298 gp->softc = sc; 299 gp->start = g_multipath_start; 300 gp->orphan = g_multipath_orphan; 301 gp->access = g_multipath_access; 302 memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid)); 303 memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name)); 304 305 pp = g_new_providerf(gp, "multipath/%s", md->md_name); 306 /* limit the provider to not have it stomp on metadata */ 307 pp->mediasize = md->md_size - md->md_sectorsize; 308 pp->sectorsize = md->md_sectorsize; 309 sc->pp = pp; 310 g_error_provider(pp, 0); 311 return (gp); 312 } 313 314 static int 315 g_multipath_add_disk(struct g_geom *gp, struct g_provider *pp) 316 { 317 struct g_multipath_softc *sc; 318 struct g_consumer *cp, *nxtcp; 319 int error; 320 321 g_topology_assert(); 322 323 sc = gp->softc; 324 KASSERT(sc, ("no softc")); 325 326 /* 327 * Make sure that the passed provider isn't already attached 328 */ 329 LIST_FOREACH(cp, &gp->consumer, consumer) { 330 if (cp->provider == pp) 331 break; 332 } 333 if (cp) { 334 printf("GEOM_MULTIPATH: provider %s already attached to %s\n", 335 pp->name, gp->name); 336 return (EEXIST); 337 } 338 nxtcp = LIST_FIRST(&gp->consumer); 339 cp = g_new_consumer(gp); 340 error = g_attach(cp, pp); 341 if (error != 0) { 342 printf("GEOM_MULTIPATH: cannot attach %s to %s", 343 pp->name, sc->sc_name); 344 g_destroy_consumer(cp); 345 return (error); 346 } 347 cp->private = sc; 348 cp->index = 0; 349 350 /* 351 * Set access permissions on new consumer to match other consumers 352 */ 353 if (nxtcp && (nxtcp->acr + nxtcp->acw + nxtcp->ace)) { 354 error = g_access(cp, nxtcp->acr, nxtcp->acw, nxtcp->ace); 355 if (error) { 356 printf("GEOM_MULTIPATH: cannot set access in " 357 "attaching %s to %s/%s (%d)\n", 358 pp->name, sc->sc_name, sc->sc_uuid, error); 359 g_detach(cp); 360 g_destroy_consumer(cp); 361 return (error); 362 } 363 } 364 printf("GEOM_MULTIPATH: adding %s to %s/%s\n", 365 pp->name, sc->sc_name, sc->sc_uuid); 366 if (sc->cp_active == NULL) { 367 sc->cp_active = cp; 368 printf("GEOM_MULTIPATH: %s now active path in %s\n", 369 pp->name, sc->sc_name); 370 } 371 return (0); 372 } 373 374 static int 375 g_multipath_destroy(struct g_geom *gp) 376 { 377 struct g_provider *pp; 378 379 g_topology_assert(); 380 if (gp->softc == NULL) 381 return (ENXIO); 382 pp = LIST_FIRST(&gp->provider); 383 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) 384 return (EBUSY); 385 printf("GEOM_MULTIPATH: destroying %s\n", gp->name); 386 g_free(gp->softc); 387 gp->softc = NULL; 388 g_wither_geom(gp, ENXIO); 389 return (0); 390 } 391 392 static int 393 g_multipath_destroy_geom(struct gctl_req *req, struct g_class *mp, 394 struct g_geom *gp) 395 { 396 397 return (g_multipath_destroy(gp)); 398 } 399 400 static int 401 g_multipath_rotate(struct g_geom *gp) 402 { 403 struct g_consumer *lcp; 404 struct g_multipath_softc *sc = gp->softc; 405 406 g_topology_assert(); 407 if (sc == NULL) 408 return (ENXIO); 409 LIST_FOREACH(lcp, &gp->consumer, consumer) { 410 if ((lcp->index & MP_BAD) == 0) { 411 if (sc->cp_active != lcp) { 412 break; 413 } 414 } 415 } 416 if (lcp) { 417 sc->cp_active = lcp; 418 printf("GEOM_MULTIPATH: %s now active path in %s\n", 419 lcp->provider->name, sc->sc_name); 420 } 421 return (0); 422 } 423 424 static void 425 g_multipath_init(struct g_class *mp) 426 { 427 bioq_init(&gmtbq); 428 mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF); 429 if (kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt") == 0) 430 g_multipath_kt_state = GKT_RUN; 431 } 432 433 static void 434 g_multipath_fini(struct g_class *mp) 435 { 436 if (g_multipath_kt_state == GKT_RUN) { 437 mtx_lock(&gmtbq_mtx); 438 g_multipath_kt_state = GKT_DIE; 439 wakeup(&g_multipath_kt_state); 440 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 441 "gmp:fini", 0); 442 mtx_unlock(&gmtbq_mtx); 443 } 444 } 445 446 static int 447 g_multipath_read_metadata(struct g_consumer *cp, 448 struct g_multipath_metadata *md) 449 { 450 struct g_provider *pp; 451 u_char *buf; 452 int error; 453 454 g_topology_assert(); 455 error = g_access(cp, 1, 0, 0); 456 if (error != 0) 457 return (error); 458 pp = cp->provider; 459 g_topology_unlock(); 460 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, 461 pp->sectorsize, &error); 462 g_topology_lock(); 463 g_access(cp, -1, 0, 0); 464 if (buf == NULL) 465 return (error); 466 multipath_metadata_decode(buf, md); 467 g_free(buf); 468 return (0); 469 } 470 471 static struct g_geom * 472 g_multipath_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 473 { 474 struct g_multipath_metadata md; 475 struct g_multipath_softc *sc; 476 struct g_consumer *cp; 477 struct g_geom *gp, *gp1; 478 int error, isnew; 479 480 g_topology_assert(); 481 482 gp = g_new_geomf(mp, "multipath:taste"); 483 gp->start = g_multipath_start; 484 gp->access = g_multipath_access; 485 gp->orphan = g_multipath_orphan; 486 cp = g_new_consumer(gp); 487 g_attach(cp, pp); 488 error = g_multipath_read_metadata(cp, &md); 489 g_detach(cp); 490 g_destroy_consumer(cp); 491 g_destroy_geom(gp); 492 if (error != 0) 493 return (NULL); 494 gp = NULL; 495 496 if (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) { 497 if (g_multipath_debug) 498 printf("%s is not MULTIPATH\n", pp->name); 499 return (NULL); 500 } 501 if (md.md_version != G_MULTIPATH_VERSION) { 502 printf("%s has version %d multipath id- this module is version " 503 " %d: rejecting\n", pp->name, md.md_version, 504 G_MULTIPATH_VERSION); 505 return (NULL); 506 } 507 if (g_multipath_debug) 508 printf("MULTIPATH: %s/%s\n", md.md_name, md.md_uuid); 509 510 /* 511 * Let's check if such a device already is present. We check against 512 * uuid alone first because that's the true distinguishor. If that 513 * passes, then we check for name conflicts. If there are conflicts, 514 * modify the name. 515 * 516 * The whole purpose of this is to solve the problem that people don't 517 * pick good unique names, but good unique names (like uuids) are a 518 * pain to use. So, we allow people to build GEOMs with friendly names 519 * and uuids, and modify the names in case there's a collision. 520 */ 521 sc = NULL; 522 LIST_FOREACH(gp, &mp->geom, geom) { 523 sc = gp->softc; 524 if (sc == NULL) 525 continue; 526 if (strncmp(md.md_uuid, sc->sc_uuid, sizeof(md.md_uuid)) == 0) 527 break; 528 } 529 530 LIST_FOREACH(gp1, &mp->geom, geom) { 531 if (gp1 == gp) 532 continue; 533 sc = gp1->softc; 534 if (sc == NULL) 535 continue; 536 if (strncmp(md.md_name, sc->sc_name, sizeof(md.md_name)) == 0) 537 break; 538 } 539 540 /* 541 * If gp is NULL, we had no extant MULTIPATH geom with this uuid. 542 * 543 * If gp1 is *not* NULL, that means we have a MULTIPATH geom extant 544 * with the same name (but a different UUID). 545 * 546 * If gp is NULL, then modify the name with a random number and 547 * complain, but allow the creation of the geom to continue. 548 * 549 * If gp is *not* NULL, just use the geom's name as we're attaching 550 * this disk to the (previously generated) name. 551 */ 552 553 if (gp1) { 554 sc = gp1->softc; 555 if (gp == NULL) { 556 char buf[16]; 557 u_long rand = random(); 558 559 snprintf(buf, sizeof (buf), "%s-%lu", md.md_name, rand); 560 printf("GEOM_MULTIPATH: geom %s/%s exists already\n", 561 sc->sc_name, sc->sc_uuid); 562 printf("GEOM_MULTIPATH: %s will be (temporarily) %s\n", 563 md.md_uuid, buf); 564 strlcpy(md.md_name, buf, sizeof(md.md_name)); 565 } else { 566 strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name)); 567 } 568 } 569 570 if (gp == NULL) { 571 gp = g_multipath_create(mp, &md); 572 if (gp == NULL) { 573 printf("GEOM_MULTIPATH: cannot create geom %s/%s\n", 574 md.md_name, md.md_uuid); 575 return (NULL); 576 } 577 isnew = 1; 578 } else { 579 isnew = 0; 580 } 581 582 sc = gp->softc; 583 KASSERT(sc != NULL, ("sc is NULL")); 584 error = g_multipath_add_disk(gp, pp); 585 if (error != 0) { 586 if (isnew) 587 g_multipath_destroy(gp); 588 return (NULL); 589 } 590 return (gp); 591 } 592 593 static void 594 g_multipath_ctl_add(struct gctl_req *req, struct g_class *mp) 595 { 596 struct g_geom *gp; 597 struct g_consumer *cp; 598 struct g_provider *pp, *pp0; 599 const char *name, *mpname; 600 static const char devpf[6] = "/dev/"; 601 602 g_topology_assert(); 603 604 mpname = gctl_get_asciiparam(req, "arg0"); 605 if (mpname == NULL) { 606 gctl_error(req, "No 'arg0' argument"); 607 return; 608 } 609 gp = g_multipath_find_geom(mp, mpname); 610 if (gp == NULL) { 611 gctl_error(req, "Device %s is invalid", mpname); 612 return; 613 } 614 615 name = gctl_get_asciiparam(req, "arg1"); 616 if (name == NULL) { 617 gctl_error(req, "No 'arg1' argument"); 618 return; 619 } 620 if (strncmp(name, devpf, 5) == 0) 621 name += 5; 622 pp = g_provider_by_name(name); 623 if (pp == NULL) { 624 gctl_error(req, "Provider %s is invalid", name); 625 return; 626 } 627 628 /* 629 * Check to make sure parameters match, if we already have one. 630 */ 631 cp = LIST_FIRST(&gp->consumer); 632 if (cp) { 633 pp0 = cp->provider; 634 } else { 635 pp0 = NULL; 636 } 637 if (pp0) { 638 if (pp0 == pp) { 639 gctl_error(req, "providers %s and %s are the same", 640 pp0->name, pp->name); 641 return; 642 } 643 if (pp0->mediasize != pp->mediasize) { 644 gctl_error(req, "Provider %s is %jd; Provider %s is %jd", 645 pp0->name, (intmax_t) pp0->mediasize, 646 pp->name, (intmax_t) pp->mediasize); 647 return; 648 } 649 if (pp0->sectorsize != pp->sectorsize) { 650 gctl_error(req, "Provider %s has sectorsize %u; Provider %s " 651 "has sectorsize %u", pp0->name, pp0->sectorsize, 652 pp->name, pp->sectorsize); 653 return; 654 } 655 } 656 657 /* 658 * Now add.... 659 */ 660 (void) g_multipath_add_disk(gp, pp); 661 } 662 663 static struct g_geom * 664 g_multipath_find_geom(struct g_class *mp, const char *name) 665 { 666 struct g_geom *gp; 667 668 LIST_FOREACH(gp, &mp->geom, geom) { 669 if (strcmp(gp->name, name) == 0) { 670 return (gp); 671 } 672 } 673 return (NULL); 674 } 675 676 static void 677 g_multipath_ctl_destroy(struct gctl_req *req, struct g_class *mp) 678 { 679 struct g_geom *gp; 680 const char *name; 681 int error; 682 683 g_topology_assert(); 684 685 name = gctl_get_asciiparam(req, "arg0"); 686 if (name == NULL) { 687 gctl_error(req, "No 'arg0' argument"); 688 return; 689 } 690 gp = g_multipath_find_geom(mp, name); 691 if (gp == NULL) { 692 gctl_error(req, "Device %s is invalid", name); 693 return; 694 } 695 error = g_multipath_destroy(gp); 696 if (error != 0) { 697 gctl_error(req, "failed to destroy %s (err=%d)", name, error); 698 } 699 } 700 701 static void 702 g_multipath_ctl_rotate(struct gctl_req *req, struct g_class *mp) 703 { 704 struct g_geom *gp; 705 const char *name; 706 int error; 707 708 g_topology_assert(); 709 710 name = gctl_get_asciiparam(req, "arg0"); 711 if (name == NULL) { 712 gctl_error(req, "No 'arg0' argument"); 713 return; 714 } 715 gp = g_multipath_find_geom(mp, name); 716 if (gp == NULL) { 717 gctl_error(req, "Device %s is invalid", name); 718 return; 719 } 720 error = g_multipath_rotate(gp); 721 if (error != 0) { 722 gctl_error(req, "failed to rotate %s (err=%d)", name, error); 723 } 724 } 725 726 static void 727 g_multipath_ctl_getactive(struct gctl_req *req, struct g_class *mp) 728 { 729 struct sbuf *sb; 730 struct g_geom *gp; 731 struct g_multipath_softc *sc; 732 const char *name; 733 734 sb = sbuf_new_auto(); 735 736 g_topology_assert(); 737 name = gctl_get_asciiparam(req, "arg0"); 738 if (name == NULL) { 739 gctl_error(req, "No 'arg0' argument"); 740 return; 741 } 742 gp = g_multipath_find_geom(mp, name); 743 if (gp == NULL) { 744 gctl_error(req, "Device %s is invalid", name); 745 return; 746 } 747 sc = gp->softc; 748 if (sc->cp_active && sc->cp_active->provider) { 749 sbuf_printf(sb, "%s\n", sc->cp_active->provider->name); 750 } else { 751 sbuf_printf(sb, "none\n"); 752 } 753 sbuf_finish(sb); 754 gctl_set_param_err(req, "output", sbuf_data(sb), sbuf_len(sb) + 1); 755 sbuf_delete(sb); 756 } 757 758 static void 759 g_multipath_config(struct gctl_req *req, struct g_class *mp, const char *verb) 760 { 761 uint32_t *version; 762 g_topology_assert(); 763 version = gctl_get_paraml(req, "version", sizeof(*version)); 764 if (version == NULL) { 765 gctl_error(req, "No 'version' argument"); 766 } else if (*version != G_MULTIPATH_VERSION) { 767 gctl_error(req, "Userland and kernel parts are out of sync"); 768 } else if (strcmp(verb, "add") == 0) { 769 g_multipath_ctl_add(req, mp); 770 } else if (strcmp(verb, "destroy") == 0) { 771 g_multipath_ctl_destroy(req, mp); 772 } else if (strcmp(verb, "rotate") == 0) { 773 g_multipath_ctl_rotate(req, mp); 774 } else if (strcmp(verb, "getactive") == 0) { 775 g_multipath_ctl_getactive(req, mp); 776 } else { 777 gctl_error(req, "Unknown verb %s", verb); 778 } 779 } 780 DECLARE_GEOM_CLASS(g_multipath_class, g_multipath); 781