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/sysctl.h> 42 #include <sys/kthread.h> 43 #include <sys/malloc.h> 44 #include <geom/geom.h> 45 #include <geom/multipath/g_multipath.h> 46 47 48 SYSCTL_DECL(_kern_geom); 49 SYSCTL_NODE(_kern_geom, OID_AUTO, multipath, CTLFLAG_RW, 0, 50 "GEOM_MULTIPATH tunables"); 51 static u_int g_multipath_debug = 0; 52 SYSCTL_UINT(_kern_geom_multipath, OID_AUTO, debug, CTLFLAG_RW, 53 &g_multipath_debug, 0, "Debug level"); 54 55 static enum { 56 GKT_NIL, 57 GKT_RUN, 58 GKT_DIE 59 } g_multipath_kt_state; 60 static struct bio_queue_head gmtbq; 61 static struct mtx gmtbq_mtx; 62 63 static void g_multipath_orphan(struct g_consumer *); 64 static void g_multipath_start(struct bio *); 65 static void g_multipath_done(struct bio *); 66 static void g_multipath_done_error(struct bio *); 67 static void g_multipath_kt(void *); 68 69 static int g_multipath_destroy(struct g_geom *); 70 static int 71 g_multipath_destroy_geom(struct gctl_req *, struct g_class *, struct g_geom *); 72 73 static struct g_geom *g_multipath_find_geom(struct g_class *, const char *); 74 static int g_multipath_rotate(struct g_geom *); 75 76 static g_taste_t g_multipath_taste; 77 static g_ctl_req_t g_multipath_config; 78 static g_init_t g_multipath_init; 79 static g_fini_t g_multipath_fini; 80 81 struct g_class g_multipath_class = { 82 .name = G_MULTIPATH_CLASS_NAME, 83 .version = G_VERSION, 84 .ctlreq = g_multipath_config, 85 .taste = g_multipath_taste, 86 .destroy_geom = g_multipath_destroy_geom, 87 .init = g_multipath_init, 88 .fini = g_multipath_fini 89 }; 90 91 #define MP_BAD 0x1 92 #define MP_POSTED 0x2 93 94 static void 95 g_mpd(void *arg, int flags __unused) 96 { 97 struct g_consumer *cp; 98 99 g_topology_assert(); 100 cp = arg; 101 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 102 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 103 if (cp->provider) { 104 printf("GEOM_MULTIPATH: %s removed from %s\n", 105 cp->provider->name, cp->geom->name); 106 g_detach(cp); 107 } 108 g_destroy_consumer(cp); 109 } 110 111 static void 112 g_multipath_orphan(struct g_consumer *cp) 113 { 114 if ((cp->index & MP_POSTED) == 0) { 115 cp->index |= MP_POSTED; 116 printf("GEOM_MULTIPATH: %s orphaned in %s\n", 117 cp->provider->name, cp->geom->name); 118 g_mpd(cp, 0); 119 } 120 } 121 122 static void 123 g_multipath_start(struct bio *bp) 124 { 125 struct g_multipath_softc *sc; 126 struct g_geom *gp; 127 struct g_consumer *cp; 128 struct bio *cbp; 129 130 gp = bp->bio_to->geom; 131 sc = gp->softc; 132 KASSERT(sc != NULL, ("NULL sc")); 133 cp = sc->cp_active; 134 if (cp == NULL) { 135 g_io_deliver(bp, ENXIO); 136 return; 137 } 138 cbp = g_clone_bio(bp); 139 if (cbp == NULL) { 140 g_io_deliver(bp, ENOMEM); 141 return; 142 } 143 cbp->bio_done = g_multipath_done; 144 g_io_request(cbp, cp); 145 } 146 147 static void 148 g_multipath_done(struct bio *bp) 149 { 150 if (bp->bio_error == ENXIO || bp->bio_error == EIO) { 151 mtx_lock(&gmtbq_mtx); 152 bioq_insert_tail(&gmtbq, bp); 153 wakeup(&g_multipath_kt_state); 154 mtx_unlock(&gmtbq_mtx); 155 } else { 156 g_std_done(bp); 157 } 158 } 159 160 static void 161 g_multipath_done_error(struct bio *bp) 162 { 163 struct bio *pbp; 164 struct g_geom *gp; 165 struct g_multipath_softc *sc; 166 struct g_consumer *cp; 167 struct g_provider *pp; 168 169 /* 170 * If we had a failure, we have to check first to see 171 * whether the consumer it failed on was the currently 172 * active consumer (i.e., this is the first in perhaps 173 * a number of failures). If so, we then switch consumers 174 * to the next available consumer. 175 */ 176 177 g_topology_lock(); 178 pbp = bp->bio_parent; 179 gp = pbp->bio_to->geom; 180 sc = gp->softc; 181 cp = bp->bio_from; 182 pp = cp->provider; 183 184 cp->index |= MP_BAD; 185 if (cp->nend == cp->nstart && pp->nend == pp->nstart) { 186 cp->index |= MP_POSTED; 187 g_post_event(g_mpd, cp, M_NOWAIT, NULL); 188 } 189 if (cp == sc->cp_active) { 190 struct g_consumer *lcp; 191 printf("GEOM_MULTIPATH: %s failed in %s\n", 192 pp->name, sc->sc_name); 193 sc->cp_active = NULL; 194 LIST_FOREACH(lcp, &gp->consumer, consumer) { 195 if ((lcp->index & MP_BAD) == 0) { 196 sc->cp_active = lcp; 197 break; 198 } 199 } 200 if (sc->cp_active == NULL || sc->cp_active->provider == NULL) { 201 printf("GEOM_MULTIPATH: out of providers for %s\n", 202 sc->sc_name); 203 g_topology_unlock(); 204 return; 205 } else { 206 printf("GEOM_MULTIPATH: %s now active path in %s\n", 207 sc->cp_active->provider->name, sc->sc_name); 208 } 209 } 210 g_topology_unlock(); 211 212 /* 213 * If we can fruitfully restart the I/O, do so. 214 */ 215 if (sc->cp_active) { 216 g_destroy_bio(bp); 217 pbp->bio_children--; 218 g_multipath_start(pbp); 219 } else { 220 g_std_done(bp); 221 } 222 } 223 224 static void 225 g_multipath_kt(void *arg) 226 { 227 228 g_multipath_kt_state = GKT_RUN; 229 mtx_lock(&gmtbq_mtx); 230 while (g_multipath_kt_state == GKT_RUN) { 231 for (;;) { 232 struct bio *bp; 233 234 bp = bioq_takefirst(&gmtbq); 235 if (bp == NULL) 236 break; 237 mtx_unlock(&gmtbq_mtx); 238 g_multipath_done_error(bp); 239 mtx_lock(&gmtbq_mtx); 240 } 241 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 242 "gkt:wait", hz / 10); 243 } 244 mtx_unlock(&gmtbq_mtx); 245 wakeup(&g_multipath_kt_state); 246 kproc_exit(0); 247 } 248 249 250 static int 251 g_multipath_access(struct g_provider *pp, int dr, int dw, int de) 252 { 253 struct g_geom *gp; 254 struct g_consumer *cp, *badcp = NULL; 255 int error; 256 257 gp = pp->geom; 258 259 LIST_FOREACH(cp, &gp->consumer, consumer) { 260 error = g_access(cp, dr, dw, de); 261 if (error) { 262 badcp = cp; 263 goto fail; 264 } 265 } 266 return (0); 267 268 fail: 269 LIST_FOREACH(cp, &gp->consumer, consumer) { 270 if (cp == badcp) 271 break; 272 (void) g_access(cp, -dr, -dw, -de); 273 } 274 return (error); 275 } 276 277 static struct g_geom * 278 g_multipath_create(struct g_class *mp, struct g_multipath_metadata *md) 279 { 280 struct g_multipath_softc *sc; 281 struct g_geom *gp; 282 struct g_provider *pp; 283 284 g_topology_assert(); 285 286 LIST_FOREACH(gp, &mp->geom, geom) { 287 if (strcmp(gp->name, md->md_name) == 0) { 288 printf("GEOM_MULTIPATH: name %s already exists\n", 289 md->md_name); 290 return (NULL); 291 } 292 } 293 294 gp = g_new_geomf(mp, md->md_name); 295 if (gp == NULL) 296 goto fail; 297 298 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 299 gp->softc = sc; 300 gp->start = g_multipath_start; 301 gp->orphan = g_multipath_orphan; 302 gp->access = g_multipath_access; 303 memcpy(sc->sc_uuid, md->md_uuid, sizeof (sc->sc_uuid)); 304 memcpy(sc->sc_name, md->md_name, sizeof (sc->sc_name)); 305 306 pp = g_new_providerf(gp, "multipath/%s", md->md_name); 307 if (pp == NULL) 308 goto fail; 309 /* limit the provider to not have it stomp on metadata */ 310 pp->mediasize = md->md_size - md->md_sectorsize; 311 pp->sectorsize = md->md_sectorsize; 312 sc->pp = pp; 313 g_error_provider(pp, 0); 314 return (gp); 315 fail: 316 if (gp != NULL) { 317 if (gp->softc != NULL) 318 g_free(gp->softc); 319 g_destroy_geom(gp); 320 } 321 return (NULL); 322 } 323 324 static int 325 g_multipath_add_disk(struct g_geom *gp, struct g_provider *pp) 326 { 327 struct g_multipath_softc *sc; 328 struct g_consumer *cp, *nxtcp; 329 int error; 330 331 g_topology_assert(); 332 333 sc = gp->softc; 334 KASSERT(sc, ("no softc")); 335 336 /* 337 * Make sure that the passed provider isn't already attached 338 */ 339 LIST_FOREACH(cp, &gp->consumer, consumer) { 340 if (cp->provider == pp) 341 break; 342 } 343 if (cp) { 344 printf("GEOM_MULTIPATH: provider %s already attached to %s\n", 345 pp->name, gp->name); 346 return (EEXIST); 347 } 348 nxtcp = LIST_FIRST(&gp->consumer); 349 cp = g_new_consumer(gp); 350 if (cp == NULL) 351 return (ENOMEM); 352 error = g_attach(cp, pp); 353 if (error != 0) { 354 printf("GEOM_MULTIPATH: cannot attach %s to %s", 355 pp->name, sc->sc_name); 356 g_destroy_consumer(cp); 357 return (error); 358 } 359 cp->private = sc; 360 cp->index = 0; 361 362 /* 363 * Set access permissions on new consumer to match other consumers 364 */ 365 if (nxtcp && (nxtcp->acr + nxtcp->acw + nxtcp->ace)) { 366 error = g_access(cp, nxtcp->acr, nxtcp->acw, nxtcp->ace); 367 if (error) { 368 printf("GEOM_MULTIPATH: cannot set access in " 369 "attaching %s to %s/%s (%d)\n", 370 pp->name, sc->sc_name, sc->sc_uuid, error); 371 g_detach(cp); 372 g_destroy_consumer(cp); 373 return (error); 374 } 375 } 376 printf("GEOM_MULTIPATH: adding %s to %s/%s\n", 377 pp->name, sc->sc_name, sc->sc_uuid); 378 if (sc->cp_active == NULL) { 379 sc->cp_active = cp; 380 printf("GEOM_MULTIPATH: %s now active path in %s\n", 381 pp->name, sc->sc_name); 382 } 383 return (0); 384 } 385 386 static int 387 g_multipath_destroy(struct g_geom *gp) 388 { 389 struct g_provider *pp; 390 391 g_topology_assert(); 392 if (gp->softc == NULL) 393 return (ENXIO); 394 pp = LIST_FIRST(&gp->provider); 395 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) 396 return (EBUSY); 397 printf("GEOM_MULTIPATH: destroying %s\n", gp->name); 398 g_free(gp->softc); 399 gp->softc = NULL; 400 g_wither_geom(gp, ENXIO); 401 return (0); 402 } 403 404 static int 405 g_multipath_destroy_geom(struct gctl_req *req, struct g_class *mp, 406 struct g_geom *gp) 407 { 408 409 return (g_multipath_destroy(gp)); 410 } 411 412 static int 413 g_multipath_rotate(struct g_geom *gp) 414 { 415 struct g_consumer *lcp; 416 struct g_multipath_softc *sc = gp->softc; 417 418 g_topology_assert(); 419 if (sc == NULL) 420 return (ENXIO); 421 LIST_FOREACH(lcp, &gp->consumer, consumer) { 422 if ((lcp->index & MP_BAD) == 0) { 423 if (sc->cp_active != lcp) { 424 break; 425 } 426 } 427 } 428 if (lcp) { 429 sc->cp_active = lcp; 430 printf("GEOM_MULTIPATH: %s now active path in %s\n", 431 lcp->provider->name, sc->sc_name); 432 } 433 return (0); 434 } 435 436 static void 437 g_multipath_init(struct g_class *mp) 438 { 439 bioq_init(&gmtbq); 440 mtx_init(&gmtbq_mtx, "gmtbq", NULL, MTX_DEF); 441 if (kproc_create(g_multipath_kt, mp, NULL, 0, 0, "g_mp_kt") == 0) 442 g_multipath_kt_state = GKT_RUN; 443 } 444 445 static void 446 g_multipath_fini(struct g_class *mp) 447 { 448 if (g_multipath_kt_state == GKT_RUN) { 449 mtx_lock(&gmtbq_mtx); 450 g_multipath_kt_state = GKT_DIE; 451 wakeup(&g_multipath_kt_state); 452 msleep(&g_multipath_kt_state, &gmtbq_mtx, PRIBIO, 453 "gmp:fini", 0); 454 mtx_unlock(&gmtbq_mtx); 455 } 456 } 457 458 static int 459 g_multipath_read_metadata(struct g_consumer *cp, 460 struct g_multipath_metadata *md) 461 { 462 struct g_provider *pp; 463 u_char *buf; 464 int error; 465 466 g_topology_assert(); 467 error = g_access(cp, 1, 0, 0); 468 if (error != 0) 469 return (error); 470 pp = cp->provider; 471 g_topology_unlock(); 472 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, 473 pp->sectorsize, &error); 474 g_topology_lock(); 475 g_access(cp, -1, 0, 0); 476 if (buf == NULL) 477 return (error); 478 multipath_metadata_decode(buf, md); 479 g_free(buf); 480 return (0); 481 } 482 483 static struct g_geom * 484 g_multipath_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 485 { 486 struct g_multipath_metadata md; 487 struct g_multipath_softc *sc; 488 struct g_consumer *cp; 489 struct g_geom *gp, *gp1; 490 int error, isnew; 491 492 g_topology_assert(); 493 494 gp = g_new_geomf(mp, "multipath:taste"); 495 gp->start = g_multipath_start; 496 gp->access = g_multipath_access; 497 gp->orphan = g_multipath_orphan; 498 cp = g_new_consumer(gp); 499 g_attach(cp, pp); 500 error = g_multipath_read_metadata(cp, &md); 501 g_detach(cp); 502 g_destroy_consumer(cp); 503 g_destroy_geom(gp); 504 if (error != 0) 505 return (NULL); 506 gp = NULL; 507 508 if (strcmp(md.md_magic, G_MULTIPATH_MAGIC) != 0) { 509 if (g_multipath_debug) 510 printf("%s is not MULTIPATH\n", pp->name); 511 return (NULL); 512 } 513 if (md.md_version != G_MULTIPATH_VERSION) { 514 printf("%s has version %d multipath id- this module is version " 515 " %d: rejecting\n", pp->name, md.md_version, 516 G_MULTIPATH_VERSION); 517 return (NULL); 518 } 519 if (g_multipath_debug) 520 printf("MULTIPATH: %s/%s\n", md.md_name, md.md_uuid); 521 522 /* 523 * Let's check if such a device already is present. We check against 524 * uuid alone first because that's the true distinguishor. If that 525 * passes, then we check for name conflicts. If there are conflicts, 526 * modify the name. 527 * 528 * The whole purpose of this is to solve the problem that people don't 529 * pick good unique names, but good unique names (like uuids) are a 530 * pain to use. So, we allow people to build GEOMs with friendly names 531 * and uuids, and modify the names in case there's a collision. 532 */ 533 sc = NULL; 534 LIST_FOREACH(gp, &mp->geom, geom) { 535 sc = gp->softc; 536 if (sc == NULL) 537 continue; 538 if (strncmp(md.md_uuid, sc->sc_uuid, sizeof(md.md_uuid)) == 0) 539 break; 540 } 541 542 LIST_FOREACH(gp1, &mp->geom, geom) { 543 if (gp1 == gp) 544 continue; 545 sc = gp1->softc; 546 if (sc == NULL) 547 continue; 548 if (strncmp(md.md_name, sc->sc_name, sizeof(md.md_name)) == 0) 549 break; 550 } 551 552 /* 553 * If gp is NULL, we had no extant MULTIPATH geom with this uuid. 554 * 555 * If gp1 is *not* NULL, that means we have a MULTIPATH geom extant 556 * with the same name (but a different UUID). 557 * 558 * If gp is NULL, then modify the name with a random number and 559 * complain, but allow the creation of the geom to continue. 560 * 561 * If gp is *not* NULL, just use the geom's name as we're attaching 562 * this disk to the (previously generated) name. 563 */ 564 565 if (gp1) { 566 sc = gp1->softc; 567 if (gp == NULL) { 568 char buf[16]; 569 u_long rand = random(); 570 571 snprintf(buf, sizeof (buf), "%s-%lu", md.md_name, rand); 572 printf("GEOM_MULTIPATH: geom %s/%s exists already\n", 573 sc->sc_name, sc->sc_uuid); 574 printf("GEOM_MULTIPATH: %s will be (temporarily) %s\n", 575 md.md_uuid, buf); 576 strlcpy(md.md_name, buf, sizeof(md.md_name)); 577 } else { 578 strlcpy(md.md_name, sc->sc_name, sizeof(md.md_name)); 579 } 580 } 581 582 if (gp == NULL) { 583 gp = g_multipath_create(mp, &md); 584 if (gp == NULL) { 585 printf("GEOM_MULTIPATH: cannot create geom %s/%s\n", 586 md.md_name, md.md_uuid); 587 return (NULL); 588 } 589 isnew = 1; 590 } else { 591 isnew = 0; 592 } 593 594 sc = gp->softc; 595 KASSERT(sc != NULL, ("sc is NULL")); 596 error = g_multipath_add_disk(gp, pp); 597 if (error != 0) { 598 if (isnew) 599 g_multipath_destroy(gp); 600 return (NULL); 601 } 602 return (gp); 603 } 604 605 static void 606 g_multipath_ctl_add(struct gctl_req *req, struct g_class *mp) 607 { 608 struct g_geom *gp; 609 struct g_consumer *cp; 610 struct g_provider *pp, *pp0; 611 const char *name, *mpname; 612 static const char devpf[6] = "/dev/"; 613 614 g_topology_assert(); 615 616 mpname = gctl_get_asciiparam(req, "arg0"); 617 if (mpname == NULL) { 618 gctl_error(req, "No 'arg0' argument"); 619 return; 620 } 621 gp = g_multipath_find_geom(mp, mpname); 622 if (gp == NULL) { 623 gctl_error(req, "Device %s is invalid", mpname); 624 return; 625 } 626 627 name = gctl_get_asciiparam(req, "arg1"); 628 if (name == NULL) { 629 gctl_error(req, "No 'arg1' argument"); 630 return; 631 } 632 if (strncmp(name, devpf, 5) == 0) 633 name += 5; 634 pp = g_provider_by_name(name); 635 if (pp == NULL) { 636 gctl_error(req, "Provider %s is invalid", name); 637 return; 638 } 639 640 /* 641 * Check to make sure parameters match, if we already have one. 642 */ 643 cp = LIST_FIRST(&gp->consumer); 644 if (cp) { 645 pp0 = cp->provider; 646 } else { 647 pp0 = NULL; 648 } 649 if (pp0) { 650 if (pp0 == pp) { 651 gctl_error(req, "providers %s and %s are the same", 652 pp0->name, pp->name); 653 return; 654 } 655 if (pp0->mediasize != pp->mediasize) { 656 gctl_error(req, "Provider %s is %jd; Provider %s is %jd", 657 pp0->name, (intmax_t) pp0->mediasize, 658 pp->name, (intmax_t) pp->mediasize); 659 return; 660 } 661 if (pp0->sectorsize != pp->sectorsize) { 662 gctl_error(req, "Provider %s has sectorsize %u; Provider %s " 663 "has sectorsize %u", pp0->name, pp0->sectorsize, 664 pp->name, pp->sectorsize); 665 return; 666 } 667 } 668 669 /* 670 * Now add.... 671 */ 672 (void) g_multipath_add_disk(gp, pp); 673 } 674 675 static struct g_geom * 676 g_multipath_find_geom(struct g_class *mp, const char *name) 677 { 678 struct g_geom *gp; 679 680 LIST_FOREACH(gp, &mp->geom, geom) { 681 if (strcmp(gp->name, name) == 0) { 682 return (gp); 683 } 684 } 685 return (NULL); 686 } 687 688 static void 689 g_multipath_ctl_destroy(struct gctl_req *req, struct g_class *mp) 690 { 691 struct g_geom *gp; 692 const char *name; 693 int error; 694 695 g_topology_assert(); 696 697 name = gctl_get_asciiparam(req, "arg0"); 698 if (name == NULL) { 699 gctl_error(req, "No 'arg0' argument"); 700 return; 701 } 702 gp = g_multipath_find_geom(mp, name); 703 if (gp == NULL) { 704 gctl_error(req, "Device %s is invalid", name); 705 return; 706 } 707 error = g_multipath_destroy(gp); 708 if (error != 0) { 709 gctl_error(req, "failed to destroy %s (err=%d)", name, error); 710 } 711 } 712 713 static void 714 g_multipath_ctl_rotate(struct gctl_req *req, struct g_class *mp) 715 { 716 struct g_geom *gp; 717 const char *name; 718 int error; 719 720 g_topology_assert(); 721 722 name = gctl_get_asciiparam(req, "arg0"); 723 if (name == NULL) { 724 gctl_error(req, "No 'arg0' argument"); 725 return; 726 } 727 gp = g_multipath_find_geom(mp, name); 728 if (gp == NULL) { 729 gctl_error(req, "Device %s is invalid", name); 730 return; 731 } 732 error = g_multipath_rotate(gp); 733 if (error != 0) { 734 gctl_error(req, "failed to rotate %s (err=%d)", name, error); 735 } 736 } 737 738 static void 739 g_multipath_ctl_getactive(struct gctl_req *req, struct g_class *mp) 740 { 741 struct sbuf *sb; 742 struct g_geom *gp; 743 struct g_multipath_softc *sc; 744 const char *name; 745 746 sb = sbuf_new_auto(); 747 748 g_topology_assert(); 749 name = gctl_get_asciiparam(req, "arg0"); 750 if (name == NULL) { 751 gctl_error(req, "No 'arg0' argument"); 752 return; 753 } 754 gp = g_multipath_find_geom(mp, name); 755 if (gp == NULL) { 756 gctl_error(req, "Device %s is invalid", name); 757 return; 758 } 759 sc = gp->softc; 760 if (sc->cp_active && sc->cp_active->provider) { 761 sbuf_printf(sb, "%s\n", sc->cp_active->provider->name); 762 } else { 763 sbuf_printf(sb, "none\n"); 764 } 765 sbuf_finish(sb); 766 gctl_set_param_err(req, "output", sbuf_data(sb), sbuf_len(sb) + 1); 767 sbuf_delete(sb); 768 } 769 770 static void 771 g_multipath_config(struct gctl_req *req, struct g_class *mp, const char *verb) 772 { 773 uint32_t *version; 774 g_topology_assert(); 775 version = gctl_get_paraml(req, "version", sizeof(*version)); 776 if (version == NULL) { 777 gctl_error(req, "No 'version' argument"); 778 } else if (*version != G_MULTIPATH_VERSION) { 779 gctl_error(req, "Userland and kernel parts are out of sync"); 780 } else if (strcmp(verb, "add") == 0) { 781 g_multipath_ctl_add(req, mp); 782 } else if (strcmp(verb, "destroy") == 0) { 783 g_multipath_ctl_destroy(req, mp); 784 } else if (strcmp(verb, "rotate") == 0) { 785 g_multipath_ctl_rotate(req, mp); 786 } else if (strcmp(verb, "getactive") == 0) { 787 g_multipath_ctl_getactive(req, mp); 788 } else { 789 gctl_error(req, "Unknown verb %s", verb); 790 } 791 } 792 DECLARE_GEOM_CLASS(g_multipath_class, g_multipath); 793