1 /*- 2 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/limits.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/bio.h> 38 #include <sys/sysctl.h> 39 #include <sys/malloc.h> 40 #include <sys/bitstring.h> 41 #include <vm/uma.h> 42 #include <machine/atomic.h> 43 #include <geom/geom.h> 44 #include <sys/proc.h> 45 #include <sys/kthread.h> 46 #include <geom/mirror/g_mirror.h> 47 48 49 static MALLOC_DEFINE(M_MIRROR, "mirror data", "GEOM_MIRROR Data"); 50 51 SYSCTL_DECL(_kern_geom); 52 SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, "GEOM_MIRROR stuff"); 53 u_int g_mirror_debug = 0; 54 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 55 "Debug level"); 56 static u_int g_mirror_sync_block_size = 131072; 57 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_block_size, CTLFLAG_RW, 58 &g_mirror_sync_block_size, 0, "Synchronization block size"); 59 static u_int g_mirror_timeout = 8; 60 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 61 0, "Time to wait on all mirror components"); 62 static u_int g_mirror_reqs_per_sync = 5; 63 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, reqs_per_sync, CTLFLAG_RW, 64 &g_mirror_reqs_per_sync, 0, 65 "Number of regular I/O requests per synchronization request"); 66 static u_int g_mirror_syncs_per_sec = 100; 67 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, syncs_per_sec, CTLFLAG_RW, 68 &g_mirror_syncs_per_sec, 0, 69 "Number of synchronizations requests per second"); 70 71 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 72 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 73 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 74 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 75 } while (0) 76 77 78 static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 79 struct g_geom *gp); 80 static g_taste_t g_mirror_taste; 81 82 struct g_class g_mirror_class = { 83 .name = G_MIRROR_CLASS_NAME, 84 .ctlreq = g_mirror_config, 85 .taste = g_mirror_taste, 86 .destroy_geom = g_mirror_destroy_geom 87 }; 88 89 90 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 91 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 92 static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 93 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 94 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 95 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 96 97 98 static const char * 99 g_mirror_disk_state2str(int state) 100 { 101 102 switch (state) { 103 case G_MIRROR_DISK_STATE_NONE: 104 return ("NONE"); 105 case G_MIRROR_DISK_STATE_NEW: 106 return ("NEW"); 107 case G_MIRROR_DISK_STATE_ACTIVE: 108 return ("ACTIVE"); 109 case G_MIRROR_DISK_STATE_STALE: 110 return ("STALE"); 111 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 112 return ("SYNCHRONIZING"); 113 case G_MIRROR_DISK_STATE_DISCONNECTED: 114 return ("DISCONNECTED"); 115 case G_MIRROR_DISK_STATE_DESTROY: 116 return ("DESTROY"); 117 default: 118 return ("INVALID"); 119 } 120 } 121 122 static const char * 123 g_mirror_device_state2str(int state) 124 { 125 126 switch (state) { 127 case G_MIRROR_DEVICE_STATE_STARTING: 128 return ("STARTING"); 129 case G_MIRROR_DEVICE_STATE_RUNNING: 130 return ("RUNNING"); 131 default: 132 return ("INVALID"); 133 } 134 } 135 136 static const char * 137 g_mirror_get_diskname(struct g_mirror_disk *disk) 138 { 139 140 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 141 return ("[unknown]"); 142 return (disk->d_name); 143 } 144 145 /* 146 * --- Events handling functions --- 147 * Events in geom_mirror are used to maintain disks and device status 148 * from one thread to simplify locking. 149 */ 150 static void 151 g_mirror_event_free(struct g_mirror_event *ep) 152 { 153 154 free(ep, M_MIRROR); 155 } 156 157 int 158 g_mirror_event_send(void *arg, int state, int flags) 159 { 160 struct g_mirror_softc *sc; 161 struct g_mirror_disk *disk; 162 struct g_mirror_event *ep; 163 int error; 164 165 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 166 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 167 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 168 disk = NULL; 169 sc = arg; 170 } else { 171 disk = arg; 172 sc = disk->d_softc; 173 } 174 ep->e_disk = disk; 175 ep->e_state = state; 176 ep->e_flags = flags; 177 ep->e_error = 0; 178 mtx_lock(&sc->sc_events_mtx); 179 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 180 mtx_unlock(&sc->sc_events_mtx); 181 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 182 mtx_lock(&sc->sc_queue_mtx); 183 wakeup(sc); 184 mtx_unlock(&sc->sc_queue_mtx); 185 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 186 return (0); 187 g_topology_assert(); 188 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 189 g_topology_unlock(); 190 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 191 mtx_lock(&sc->sc_events_mtx); 192 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 193 hz * 5); 194 } 195 /* Don't even try to use 'sc' here, because it could be already dead. */ 196 g_topology_lock(); 197 error = ep->e_error; 198 g_mirror_event_free(ep); 199 return (error); 200 } 201 202 static struct g_mirror_event * 203 g_mirror_event_get(struct g_mirror_softc *sc) 204 { 205 struct g_mirror_event *ep; 206 207 mtx_lock(&sc->sc_events_mtx); 208 ep = TAILQ_FIRST(&sc->sc_events); 209 if (ep != NULL) 210 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 211 mtx_unlock(&sc->sc_events_mtx); 212 return (ep); 213 } 214 215 static void 216 g_mirror_event_cancel(struct g_mirror_disk *disk) 217 { 218 struct g_mirror_softc *sc; 219 struct g_mirror_event *ep, *tmpep; 220 221 g_topology_assert(); 222 223 sc = disk->d_softc; 224 mtx_lock(&sc->sc_events_mtx); 225 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 226 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 227 continue; 228 if (ep->e_disk != disk) 229 continue; 230 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 231 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 232 g_mirror_event_free(ep); 233 else { 234 ep->e_error = ECANCELED; 235 wakeup(ep); 236 } 237 } 238 mtx_unlock(&sc->sc_events_mtx); 239 } 240 241 /* 242 * Return the number of disks in given state. 243 * If state is equal to -1, count all connected disks. 244 */ 245 u_int 246 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 247 { 248 struct g_mirror_disk *disk; 249 u_int n = 0; 250 251 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 252 if (state == -1 || disk->d_state == state) 253 n++; 254 } 255 return (n); 256 } 257 258 /* 259 * Find a disk in mirror by its disk ID. 260 */ 261 static struct g_mirror_disk * 262 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 263 { 264 struct g_mirror_disk *disk; 265 266 g_topology_assert(); 267 268 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 269 if (disk->d_id == id) 270 return (disk); 271 } 272 return (NULL); 273 } 274 275 static u_int 276 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 277 { 278 struct bio *bp; 279 u_int nreqs = 0; 280 281 mtx_lock(&sc->sc_queue_mtx); 282 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 283 if (bp->bio_from == cp) 284 nreqs++; 285 } 286 mtx_unlock(&sc->sc_queue_mtx); 287 return (nreqs); 288 } 289 290 static void 291 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 292 { 293 294 g_topology_assert(); 295 296 cp->private = NULL; 297 if (cp->nstart != cp->nend) { 298 G_MIRROR_DEBUG(2, 299 "I/O requests for %s exist, can't destroy it now.", 300 cp->provider->name); 301 return; 302 } 303 if (g_mirror_nrequests(sc, cp) > 0) { 304 G_MIRROR_DEBUG(2, 305 "I/O requests for %s in queue, can't destroy it now.", 306 cp->provider->name); 307 return; 308 } 309 G_MIRROR_DEBUG(2, "Consumer %s destroyed.", cp->provider->name); 310 g_detach(cp); 311 g_destroy_consumer(cp); 312 } 313 314 static int 315 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 316 { 317 int error; 318 319 g_topology_assert(); 320 KASSERT(disk->d_consumer == NULL, 321 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 322 323 disk->d_consumer = g_new_consumer(disk->d_softc->sc_geom); 324 disk->d_consumer->private = disk; 325 error = g_attach(disk->d_consumer, pp); 326 if (error != 0) 327 return (error); 328 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 329 return (0); 330 } 331 332 static void 333 g_mirror_disconnect_disk(struct g_mirror_disk *disk) 334 { 335 struct g_consumer *cp; 336 337 g_topology_assert(); 338 339 cp = disk->d_consumer; 340 if (cp == NULL) 341 return; 342 if (cp->provider != NULL) { 343 G_MIRROR_DEBUG(2, "Disk %s disconnected.", 344 g_mirror_get_diskname(disk)); 345 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) { 346 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 347 cp->provider->name, -cp->acr, -cp->acw, -cp->ace, 348 0); 349 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 350 } 351 g_mirror_kill_consumer(disk->d_softc, cp); 352 } else { 353 g_destroy_consumer(cp); 354 } 355 } 356 357 /* 358 * Initialize disk. This means allocate memory, create consumer, attach it 359 * to the provider and open access (r1w1e1) to it. 360 */ 361 static struct g_mirror_disk * 362 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 363 struct g_mirror_metadata *md, int *errorp) 364 { 365 struct g_mirror_disk *disk; 366 int error; 367 368 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 369 if (disk == NULL) { 370 error = ENOMEM; 371 goto fail; 372 } 373 disk->d_softc = sc; 374 error = g_mirror_connect_disk(disk, pp); 375 if (error != 0) 376 goto fail; 377 disk->d_id = md->md_did; 378 disk->d_state = G_MIRROR_DISK_STATE_NONE; 379 disk->d_priority = md->md_priority; 380 disk->d_delay.sec = 0; 381 disk->d_delay.frac = 0; 382 binuptime(&disk->d_last_used); 383 disk->d_flags = md->md_dflags; 384 disk->d_sync.ds_consumer = NULL; 385 disk->d_sync.ds_offset = md->md_sync_offset; 386 disk->d_sync.ds_offset_done = md->md_sync_offset; 387 disk->d_sync.ds_syncid = md->md_syncid; 388 if (errorp != NULL) 389 *errorp = 0; 390 return (disk); 391 fail: 392 if (errorp != NULL) 393 *errorp = error; 394 if (disk != NULL) { 395 g_mirror_disconnect_disk(disk); 396 free(disk, M_MIRROR); 397 } 398 return (NULL); 399 } 400 401 /* 402 * Free the disk. 403 */ 404 static void 405 g_mirror_free_disk(struct g_mirror_disk *disk) 406 { 407 408 g_topology_assert(); 409 410 g_mirror_disconnect_disk(disk); 411 free(disk, M_MIRROR); 412 } 413 414 static void 415 g_mirror_destroy_disk(struct g_mirror_disk *disk) 416 { 417 struct g_mirror_softc *sc; 418 419 g_topology_assert(); 420 421 LIST_REMOVE(disk, d_next); 422 g_mirror_event_cancel(disk); 423 sc = disk->d_softc; 424 if (sc->sc_hint == disk) 425 sc->sc_hint = NULL; 426 switch (disk->d_state) { 427 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 428 g_mirror_sync_stop(disk, 1); 429 /* FALLTHROUGH */ 430 case G_MIRROR_DISK_STATE_NEW: 431 case G_MIRROR_DISK_STATE_STALE: 432 case G_MIRROR_DISK_STATE_ACTIVE: 433 g_mirror_free_disk(disk); 434 break; 435 default: 436 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 437 g_mirror_get_diskname(disk), 438 g_mirror_disk_state2str(disk->d_state))); 439 } 440 } 441 442 static void 443 g_mirror_destroy_device(struct g_mirror_softc *sc) 444 { 445 struct g_mirror_disk *disk; 446 struct g_mirror_event *ep; 447 struct g_geom *gp; 448 struct g_consumer *cp; 449 450 g_topology_assert(); 451 452 gp = sc->sc_geom; 453 if (sc->sc_provider != NULL) 454 g_mirror_destroy_provider(sc); 455 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 456 disk = LIST_FIRST(&sc->sc_disks)) { 457 g_mirror_destroy_disk(disk); 458 } 459 while ((ep = g_mirror_event_get(sc)) != NULL) { 460 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 461 g_mirror_event_free(ep); 462 else { 463 ep->e_error = ECANCELED; 464 ep->e_flags |= G_MIRROR_EVENT_DONE; 465 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 466 mtx_lock(&sc->sc_events_mtx); 467 wakeup(ep); 468 mtx_unlock(&sc->sc_events_mtx); 469 } 470 } 471 callout_drain(&sc->sc_callout); 472 gp->softc = NULL; 473 uma_zdestroy(sc->sc_sync.ds_zone); 474 while ((cp = LIST_FIRST(&sc->sc_sync.ds_geom->consumer)) != NULL) { 475 if (cp->provider != NULL) { 476 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 477 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 478 g_detach(cp); 479 } 480 g_destroy_consumer(cp); 481 } 482 sc->sc_sync.ds_geom->softc = NULL; 483 g_destroy_geom(sc->sc_sync.ds_geom); 484 mtx_destroy(&sc->sc_queue_mtx); 485 mtx_destroy(&sc->sc_events_mtx); 486 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 487 g_wither_geom(gp, ENXIO); 488 } 489 490 static void 491 g_mirror_orphan(struct g_consumer *cp) 492 { 493 struct g_mirror_disk *disk; 494 495 g_topology_assert(); 496 497 disk = cp->private; 498 if (disk == NULL) 499 return; 500 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 501 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 502 G_MIRROR_EVENT_DONTWAIT); 503 } 504 505 static void 506 g_mirror_spoiled(struct g_consumer *cp) 507 { 508 struct g_mirror_disk *disk; 509 510 g_topology_assert(); 511 512 disk = cp->private; 513 if (disk == NULL) 514 return; 515 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 516 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 517 G_MIRROR_EVENT_DONTWAIT); 518 } 519 520 /* 521 * Function should return the next active disk on the list. 522 * It is possible that it will be the same disk as given. 523 * If there are no active disks on list, NULL is returned. 524 */ 525 static __inline struct g_mirror_disk * 526 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 527 { 528 struct g_mirror_disk *dp; 529 530 for (dp = LIST_NEXT(disk, d_next); dp != disk; 531 dp = LIST_NEXT(dp, d_next)) { 532 if (dp == NULL) 533 dp = LIST_FIRST(&sc->sc_disks); 534 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 535 break; 536 } 537 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 538 return (NULL); 539 return (dp); 540 } 541 542 static struct g_mirror_disk * 543 g_mirror_get_disk(struct g_mirror_softc *sc) 544 { 545 struct g_mirror_disk *disk; 546 547 if (sc->sc_hint == NULL) { 548 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 549 if (sc->sc_hint == NULL) 550 return (NULL); 551 } 552 disk = sc->sc_hint; 553 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 554 disk = g_mirror_find_next(sc, disk); 555 if (disk == NULL) 556 return (NULL); 557 } 558 sc->sc_hint = g_mirror_find_next(sc, disk); 559 return (disk); 560 } 561 562 static int 563 g_mirror_clear_metadata(struct g_mirror_disk *disk) 564 { 565 struct g_mirror_softc *sc; 566 struct g_consumer *cp; 567 off_t offset, length; 568 u_char *sector; 569 int close = 0, error = 0; 570 571 g_topology_assert(); 572 573 sc = disk->d_softc; 574 cp = disk->d_consumer; 575 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 576 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 577 length = cp->provider->sectorsize; 578 offset = cp->provider->mediasize - length; 579 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 580 /* 581 * Open consumer if it wasn't opened and remember to close it. 582 */ 583 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 584 error = g_access(cp, 0, 1, 1); 585 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 586 cp->provider->name, 0, 1, 1, error); 587 if (error == 0) 588 close = 1; 589 #ifdef INVARIANTS 590 } else { 591 KASSERT(cp->acw > 0 && cp->ace > 0, 592 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 593 cp->acr, cp->acw, cp->ace)); 594 #endif 595 } 596 if (error == 0) { 597 g_topology_unlock(); 598 error = g_write_data(cp, offset, sector, length); 599 g_topology_lock(); 600 } 601 free(sector, M_MIRROR); 602 if (close) { 603 g_access(cp, 0, -1, -1); 604 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 605 cp->provider->name, 0, -1, -1, 0); 606 } 607 if (error != 0) { 608 G_MIRROR_DEBUG(0, "Cannot clear metadata on disk %s.", 609 g_mirror_get_diskname(disk)); 610 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 611 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 612 G_MIRROR_EVENT_DONTWAIT); 613 return (error); 614 } 615 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 616 g_mirror_get_diskname(disk)); 617 return (0); 618 } 619 620 void 621 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 622 struct g_mirror_metadata *md) 623 { 624 625 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 626 md->md_version = G_MIRROR_VERSION; 627 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 628 md->md_mid = sc->sc_id; 629 md->md_all = sc->sc_ndisks; 630 md->md_slice = sc->sc_slice; 631 md->md_balance = sc->sc_balance; 632 md->md_mediasize = sc->sc_mediasize; 633 md->md_sectorsize = sc->sc_sectorsize; 634 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 635 if (disk == NULL) { 636 md->md_did = arc4random(); 637 md->md_priority = 0; 638 md->md_syncid = 0; 639 md->md_dflags = 0; 640 md->md_sync_offset = 0; 641 } else { 642 md->md_did = disk->d_id; 643 md->md_priority = disk->d_priority; 644 md->md_syncid = disk->d_sync.ds_syncid; 645 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 646 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 647 md->md_sync_offset = disk->d_sync.ds_offset_done; 648 else 649 md->md_sync_offset = 0; 650 } 651 } 652 653 void 654 g_mirror_update_metadata(struct g_mirror_disk *disk) 655 { 656 struct g_mirror_softc *sc; 657 struct g_mirror_metadata md; 658 struct g_consumer *cp; 659 off_t offset, length; 660 u_char *sector; 661 int close = 0, error = 0; 662 663 g_topology_assert(); 664 665 sc = disk->d_softc; 666 cp = disk->d_consumer; 667 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 668 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 669 length = cp->provider->sectorsize; 670 offset = cp->provider->mediasize - length; 671 sector = malloc((size_t)length, M_MIRROR, M_WAITOK); 672 /* 673 * Open consumer if it wasn't opened and remember to close it. 674 */ 675 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 676 error = g_access(cp, 0, 1, 1); 677 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 678 cp->provider->name, 0, 1, 1, error); 679 if (error == 0) 680 close = 1; 681 #ifdef INVARIANTS 682 } else { 683 KASSERT(cp->acw > 0 && cp->ace > 0, 684 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 685 cp->acr, cp->acw, cp->ace)); 686 #endif 687 } 688 if (error == 0) { 689 g_mirror_fill_metadata(sc, disk, &md); 690 mirror_metadata_encode(&md, sector); 691 g_topology_unlock(); 692 error = g_write_data(cp, offset, sector, length); 693 g_topology_lock(); 694 } 695 free(sector, M_MIRROR); 696 if (close) { 697 g_access(cp, 0, -1, -1); 698 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 699 cp->provider->name, 0, -1, -1, 0); 700 } 701 if (error != 0) { 702 G_MIRROR_DEBUG(0, 703 "Cannot update metadata on disk %s (error=%d).", 704 g_mirror_get_diskname(disk), error); 705 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 706 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 707 G_MIRROR_EVENT_DONTWAIT); 708 return; 709 } 710 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 711 g_mirror_get_diskname(disk)); 712 } 713 714 static void 715 g_mirror_bump_syncid(struct g_mirror_softc *sc) 716 { 717 struct g_mirror_disk *disk; 718 719 g_topology_assert(); 720 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 721 ("%s called with no active disks (device=%s).", __func__, 722 sc->sc_name)); 723 724 sc->sc_syncid++; 725 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 726 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 727 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 728 disk->d_sync.ds_syncid = sc->sc_syncid; 729 g_mirror_update_metadata(disk); 730 } 731 } 732 } 733 734 static __inline int 735 bintime_cmp(struct bintime *bt1, struct bintime *bt2) 736 { 737 738 if (bt1->sec < bt2->sec) 739 return (-1); 740 else if (bt1->sec > bt2->sec) 741 return (1); 742 if (bt1->frac < bt2->frac) 743 return (-1); 744 else if (bt1->frac > bt2->frac) 745 return (1); 746 return (0); 747 } 748 749 static void 750 g_mirror_update_delay(struct g_mirror_disk *disk, struct bio *bp) 751 { 752 753 if (disk->d_softc->sc_balance != G_MIRROR_BALANCE_LOAD) 754 return; 755 binuptime(&disk->d_delay); 756 bintime_sub(&disk->d_delay, &bp->bio_t0); 757 } 758 759 static void 760 g_mirror_done(struct bio *bp) 761 { 762 struct g_mirror_softc *sc; 763 764 sc = bp->bio_from->geom->softc; 765 bp->bio_flags = BIO_FLAG1; 766 mtx_lock(&sc->sc_queue_mtx); 767 bioq_disksort(&sc->sc_queue, bp); 768 wakeup(sc); 769 mtx_unlock(&sc->sc_queue_mtx); 770 } 771 772 static void 773 g_mirror_regular_request(struct bio *bp) 774 { 775 struct g_mirror_softc *sc; 776 struct g_mirror_disk *disk; 777 struct bio *pbp; 778 779 g_topology_assert_not(); 780 781 pbp = bp->bio_parent; 782 sc = pbp->bio_to->geom->softc; 783 disk = bp->bio_from->private; 784 if (disk == NULL) { 785 g_topology_lock(); 786 g_mirror_kill_consumer(sc, bp->bio_from); 787 g_topology_unlock(); 788 } else { 789 g_mirror_update_delay(disk, bp); 790 } 791 792 pbp->bio_inbed++; 793 KASSERT(pbp->bio_inbed <= pbp->bio_children, 794 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 795 pbp->bio_children)); 796 if (bp->bio_error == 0 && pbp->bio_error == 0) { 797 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 798 g_destroy_bio(bp); 799 if (pbp->bio_children == pbp->bio_inbed) { 800 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 801 pbp->bio_completed = pbp->bio_length; 802 g_io_deliver(pbp, pbp->bio_error); 803 } 804 return; 805 } else if (bp->bio_error != 0) { 806 if (pbp->bio_error == 0) 807 pbp->bio_error = bp->bio_error; 808 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 809 bp->bio_error); 810 if (disk != NULL) { 811 sc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 812 g_mirror_event_send(disk, 813 G_MIRROR_DISK_STATE_DISCONNECTED, 814 G_MIRROR_EVENT_DONTWAIT); 815 } 816 switch (pbp->bio_cmd) { 817 case BIO_DELETE: 818 case BIO_WRITE: 819 pbp->bio_inbed--; 820 pbp->bio_children--; 821 break; 822 } 823 } 824 g_destroy_bio(bp); 825 826 switch (pbp->bio_cmd) { 827 case BIO_READ: 828 if (pbp->bio_children == pbp->bio_inbed) { 829 pbp->bio_error = 0; 830 mtx_lock(&sc->sc_queue_mtx); 831 bioq_disksort(&sc->sc_queue, pbp); 832 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 833 wakeup(sc); 834 mtx_unlock(&sc->sc_queue_mtx); 835 } 836 break; 837 case BIO_DELETE: 838 case BIO_WRITE: 839 if (pbp->bio_children == 0) { 840 /* 841 * All requests failed. 842 */ 843 } else if (pbp->bio_inbed < pbp->bio_children) { 844 /* Do nothing. */ 845 break; 846 } else if (pbp->bio_children == pbp->bio_inbed) { 847 /* Some requests succeeded. */ 848 pbp->bio_error = 0; 849 pbp->bio_completed = pbp->bio_length; 850 } 851 g_io_deliver(pbp, pbp->bio_error); 852 break; 853 default: 854 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 855 break; 856 } 857 } 858 859 static void 860 g_mirror_sync_done(struct bio *bp) 861 { 862 struct g_mirror_softc *sc; 863 864 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 865 sc = bp->bio_from->geom->softc; 866 bp->bio_flags = BIO_FLAG2; 867 mtx_lock(&sc->sc_queue_mtx); 868 bioq_disksort(&sc->sc_queue, bp); 869 wakeup(sc); 870 mtx_unlock(&sc->sc_queue_mtx); 871 } 872 873 static void 874 g_mirror_start(struct bio *bp) 875 { 876 struct g_mirror_softc *sc; 877 878 sc = bp->bio_to->geom->softc; 879 /* 880 * If sc == NULL or there are no valid disks, provider's error 881 * should be set and g_mirror_start() should not be called at all. 882 */ 883 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 884 ("Provider's error should be set (error=%d)(mirror=%s).", 885 bp->bio_to->error, bp->bio_to->name)); 886 G_MIRROR_LOGREQ(3, bp, "Request received."); 887 888 switch (bp->bio_cmd) { 889 case BIO_READ: 890 case BIO_WRITE: 891 case BIO_DELETE: 892 break; 893 case BIO_GETATTR: 894 default: 895 g_io_deliver(bp, EOPNOTSUPP); 896 return; 897 } 898 mtx_lock(&sc->sc_queue_mtx); 899 bioq_disksort(&sc->sc_queue, bp); 900 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 901 wakeup(sc); 902 mtx_unlock(&sc->sc_queue_mtx); 903 } 904 905 /* 906 * Send one synchronization request. 907 */ 908 static void 909 g_mirror_sync_one(struct g_mirror_disk *disk) 910 { 911 struct g_mirror_softc *sc; 912 struct bio *bp; 913 914 sc = disk->d_softc; 915 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 916 ("Disk %s is not marked for synchronization.", 917 g_mirror_get_diskname(disk))); 918 919 bp = g_new_bio(); 920 if (bp == NULL) 921 return; 922 bp->bio_parent = NULL; 923 bp->bio_cmd = BIO_READ; 924 bp->bio_offset = disk->d_sync.ds_offset; 925 bp->bio_length = MIN(sc->sc_sync.ds_block, 926 sc->sc_mediasize - bp->bio_offset); 927 bp->bio_flags = 0; 928 bp->bio_done = g_mirror_sync_done; 929 bp->bio_data = uma_zalloc(sc->sc_sync.ds_zone, M_NOWAIT | M_ZERO); 930 if (bp->bio_data == NULL) { 931 g_destroy_bio(bp); 932 return; 933 } 934 disk->d_sync.ds_offset += bp->bio_length; 935 bp->bio_to = sc->sc_provider; 936 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 937 g_io_request(bp, disk->d_sync.ds_consumer); 938 } 939 940 static void 941 g_mirror_sync_request(struct bio *bp) 942 { 943 struct g_mirror_softc *sc; 944 struct g_mirror_disk *disk; 945 946 sc = bp->bio_from->geom->softc; 947 disk = bp->bio_from->private; 948 if (disk == NULL) { 949 g_topology_lock(); 950 g_mirror_kill_consumer(sc, bp->bio_from); 951 g_topology_unlock(); 952 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 953 g_destroy_bio(bp); 954 return; 955 } 956 957 /* 958 * Synchronization request. 959 */ 960 switch (bp->bio_cmd) { 961 case BIO_READ: 962 { 963 struct g_consumer *cp; 964 965 if (bp->bio_error != 0) { 966 G_MIRROR_LOGREQ(0, bp, 967 "Synchronization request failed (error=%d).", 968 bp->bio_error); 969 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 970 g_destroy_bio(bp); 971 return; 972 } 973 bp->bio_cmd = BIO_WRITE; 974 bp->bio_flags = 0; 975 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 976 cp = disk->d_consumer; 977 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 978 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 979 cp->acr, cp->acw, cp->ace)); 980 g_io_request(bp, cp); 981 return; 982 } 983 case BIO_WRITE: 984 uma_zfree(sc->sc_sync.ds_zone, bp->bio_data); 985 if (bp->bio_error != 0) { 986 G_MIRROR_LOGREQ(0, bp, 987 "Synchronization request failed (error=%d).", 988 bp->bio_error); 989 g_destroy_bio(bp); 990 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_IMMEDIATELY; 991 g_mirror_event_send(disk, 992 G_MIRROR_DISK_STATE_DISCONNECTED, 993 G_MIRROR_EVENT_DONTWAIT); 994 return; 995 } 996 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 997 g_destroy_bio(bp); 998 disk->d_sync.ds_offset_done = bp->bio_offset + bp->bio_length; 999 if (bp->bio_offset + bp->bio_length == 1000 sc->sc_provider->mediasize) { 1001 /* 1002 * Disk up-to-date, activate it. 1003 */ 1004 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1005 G_MIRROR_EVENT_DONTWAIT); 1006 return; 1007 } else if ((disk->d_sync.ds_offset_done % 1008 (sc->sc_sync.ds_block * 100)) == 0) { 1009 /* 1010 * Update offset_done on every 100 blocks. 1011 * XXX: This should be configurable. 1012 */ 1013 g_topology_lock(); 1014 g_mirror_update_metadata(disk); 1015 g_topology_unlock(); 1016 } 1017 return; 1018 default: 1019 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1020 bp->bio_cmd, sc->sc_name)); 1021 break; 1022 } 1023 } 1024 1025 static void 1026 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1027 { 1028 struct g_mirror_disk *disk; 1029 struct g_consumer *cp; 1030 struct bio *cbp; 1031 1032 disk = g_mirror_get_disk(sc); 1033 if (disk == NULL) { 1034 if (bp->bio_error == 0) 1035 bp->bio_error = ENXIO; 1036 g_io_deliver(bp, bp->bio_error); 1037 return; 1038 } 1039 cbp = g_clone_bio(bp); 1040 if (cbp == NULL) { 1041 if (bp->bio_error == 0) 1042 bp->bio_error = ENOMEM; 1043 g_io_deliver(bp, bp->bio_error); 1044 return; 1045 } 1046 /* 1047 * Fill in the component buf structure. 1048 */ 1049 cp = disk->d_consumer; 1050 cbp->bio_done = g_mirror_done; 1051 cbp->bio_to = cp->provider; 1052 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1053 KASSERT(cp->acr > 0 && cp->ace > 0, 1054 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1055 cp->acw, cp->ace)); 1056 g_io_request(cbp, cp); 1057 } 1058 1059 static void 1060 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1061 { 1062 struct g_mirror_disk *disk, *dp; 1063 struct g_consumer *cp; 1064 struct bio *cbp; 1065 struct bintime curtime; 1066 1067 binuptime(&curtime); 1068 /* 1069 * Find a disk which the smallest load. 1070 */ 1071 disk = NULL; 1072 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1073 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1074 continue; 1075 /* If disk wasn't used for more than 2 sec, use it. */ 1076 if (curtime.sec - dp->d_last_used.sec >= 2) { 1077 disk = dp; 1078 break; 1079 } 1080 if (disk == NULL || 1081 bintime_cmp(&dp->d_delay, &disk->d_delay) < 0) { 1082 disk = dp; 1083 } 1084 } 1085 cbp = g_clone_bio(bp); 1086 if (cbp == NULL) { 1087 if (bp->bio_error == 0) 1088 bp->bio_error = ENOMEM; 1089 g_io_deliver(bp, bp->bio_error); 1090 return; 1091 } 1092 /* 1093 * Fill in the component buf structure. 1094 */ 1095 cp = disk->d_consumer; 1096 cbp->bio_done = g_mirror_done; 1097 cbp->bio_to = cp->provider; 1098 binuptime(&disk->d_last_used); 1099 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1100 KASSERT(cp->acr > 0 && cp->ace > 0, 1101 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1102 cp->acw, cp->ace)); 1103 g_io_request(cbp, cp); 1104 } 1105 1106 static void 1107 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1108 { 1109 struct bio_queue_head queue; 1110 struct g_mirror_disk *disk; 1111 struct g_consumer *cp; 1112 struct bio *cbp; 1113 off_t left, mod, offset, slice; 1114 u_char *data; 1115 u_int ndisks; 1116 1117 if (bp->bio_length <= sc->sc_slice) { 1118 g_mirror_request_round_robin(sc, bp); 1119 return; 1120 } 1121 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1122 slice = bp->bio_length / ndisks; 1123 mod = slice % sc->sc_provider->sectorsize; 1124 if (mod != 0) 1125 slice += sc->sc_provider->sectorsize - mod; 1126 /* 1127 * Allocate all bios before sending any request, so we can 1128 * return ENOMEM in nice and clean way. 1129 */ 1130 left = bp->bio_length; 1131 offset = bp->bio_offset; 1132 data = bp->bio_data; 1133 bioq_init(&queue); 1134 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1135 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1136 continue; 1137 cbp = g_clone_bio(bp); 1138 if (cbp == NULL) { 1139 for (cbp = bioq_first(&queue); cbp != NULL; 1140 cbp = bioq_first(&queue)) { 1141 bioq_remove(&queue, cbp); 1142 g_destroy_bio(cbp); 1143 } 1144 if (bp->bio_error == 0) 1145 bp->bio_error = ENOMEM; 1146 g_io_deliver(bp, bp->bio_error); 1147 return; 1148 } 1149 bioq_insert_tail(&queue, cbp); 1150 cbp->bio_done = g_mirror_done; 1151 cbp->bio_caller1 = disk; 1152 cbp->bio_to = disk->d_consumer->provider; 1153 cbp->bio_offset = offset; 1154 cbp->bio_data = data; 1155 cbp->bio_length = MIN(left, slice); 1156 left -= cbp->bio_length; 1157 if (left == 0) 1158 break; 1159 offset += cbp->bio_length; 1160 data += cbp->bio_length; 1161 } 1162 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1163 bioq_remove(&queue, cbp); 1164 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1165 disk = cbp->bio_caller1; 1166 cbp->bio_caller1 = NULL; 1167 cp = disk->d_consumer; 1168 KASSERT(cp->acr > 0 && cp->ace > 0, 1169 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1170 cp->acr, cp->acw, cp->ace)); 1171 g_io_request(cbp, disk->d_consumer); 1172 } 1173 } 1174 1175 static void 1176 g_mirror_register_request(struct bio *bp) 1177 { 1178 struct g_mirror_softc *sc; 1179 1180 sc = bp->bio_to->geom->softc; 1181 switch (bp->bio_cmd) { 1182 case BIO_READ: 1183 switch (sc->sc_balance) { 1184 case G_MIRROR_BALANCE_ROUND_ROBIN: 1185 g_mirror_request_round_robin(sc, bp); 1186 break; 1187 case G_MIRROR_BALANCE_LOAD: 1188 g_mirror_request_load(sc, bp); 1189 break; 1190 case G_MIRROR_BALANCE_SPLIT: 1191 g_mirror_request_split(sc, bp); 1192 break; 1193 } 1194 return; 1195 case BIO_WRITE: 1196 case BIO_DELETE: 1197 { 1198 struct g_mirror_disk *disk; 1199 struct bio_queue_head queue; 1200 struct g_consumer *cp; 1201 struct bio *cbp; 1202 1203 /* 1204 * Allocate all bios before sending any request, so we can 1205 * return ENOMEM in nice and clean way. 1206 */ 1207 bioq_init(&queue); 1208 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1209 switch (disk->d_state) { 1210 case G_MIRROR_DISK_STATE_ACTIVE: 1211 break; 1212 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1213 if (bp->bio_offset >= disk->d_sync.ds_offset) 1214 continue; 1215 break; 1216 default: 1217 continue; 1218 } 1219 cbp = g_clone_bio(bp); 1220 if (cbp == NULL) { 1221 for (cbp = bioq_first(&queue); cbp != NULL; 1222 cbp = bioq_first(&queue)) { 1223 bioq_remove(&queue, cbp); 1224 g_destroy_bio(cbp); 1225 } 1226 if (bp->bio_error == 0) 1227 bp->bio_error = ENOMEM; 1228 g_io_deliver(bp, bp->bio_error); 1229 return; 1230 } 1231 bioq_insert_tail(&queue, cbp); 1232 } 1233 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1234 switch (disk->d_state) { 1235 case G_MIRROR_DISK_STATE_ACTIVE: 1236 break; 1237 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1238 if (bp->bio_offset >= disk->d_sync.ds_offset) 1239 continue; 1240 break; 1241 default: 1242 continue; 1243 } 1244 cbp = bioq_first(&queue); 1245 KASSERT(cbp != NULL, ("NULL cbp! (device %s).", 1246 sc->sc_name)); 1247 bioq_remove(&queue, cbp); 1248 cp = disk->d_consumer; 1249 cbp->bio_done = g_mirror_done; 1250 cbp->bio_to = cp->provider; 1251 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1252 KASSERT(cp->acw > 0 && cp->ace > 0, 1253 ("Consumer %s not opened (r%dw%de%d).", 1254 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1255 g_io_request(cbp, cp); 1256 } 1257 /* 1258 * Bump syncid on first write. 1259 */ 1260 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) { 1261 sc->sc_bump_syncid = 0; 1262 g_topology_lock(); 1263 g_mirror_bump_syncid(sc); 1264 g_topology_unlock(); 1265 } 1266 return; 1267 } 1268 default: 1269 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1270 bp->bio_cmd, sc->sc_name)); 1271 break; 1272 } 1273 } 1274 1275 /* 1276 * Worker thread. 1277 */ 1278 static void 1279 g_mirror_worker(void *arg) 1280 { 1281 struct g_mirror_softc *sc; 1282 struct g_mirror_disk *disk; 1283 struct g_mirror_event *ep; 1284 struct bio *bp; 1285 u_int nreqs; 1286 1287 sc = arg; 1288 curthread->td_base_pri = PRIBIO; 1289 1290 nreqs = 0; 1291 for (;;) { 1292 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1293 /* 1294 * First take a look at events. 1295 * This is important to handle events before any I/O requests. 1296 */ 1297 ep = g_mirror_event_get(sc); 1298 if (ep != NULL) { 1299 g_topology_lock(); 1300 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1301 /* Update only device status. */ 1302 G_MIRROR_DEBUG(3, 1303 "Running event for device %s.", 1304 sc->sc_name); 1305 ep->e_error = 0; 1306 g_mirror_update_device(sc, 1); 1307 } else { 1308 /* Update disk status. */ 1309 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1310 g_mirror_get_diskname(ep->e_disk)); 1311 ep->e_error = g_mirror_update_disk(ep->e_disk, 1312 ep->e_state); 1313 if (ep->e_error == 0) 1314 g_mirror_update_device(sc, 0); 1315 } 1316 g_topology_unlock(); 1317 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1318 KASSERT(ep->e_error == 0, 1319 ("Error cannot be handled.")); 1320 g_mirror_event_free(ep); 1321 } else { 1322 ep->e_flags |= G_MIRROR_EVENT_DONE; 1323 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1324 ep); 1325 mtx_lock(&sc->sc_events_mtx); 1326 wakeup(ep); 1327 mtx_unlock(&sc->sc_events_mtx); 1328 } 1329 if ((sc->sc_flags & 1330 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1331 end: 1332 if ((sc->sc_flags & 1333 G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1334 G_MIRROR_DEBUG(4, "%s: Waking up %p.", 1335 __func__, &sc->sc_worker); 1336 wakeup(&sc->sc_worker); 1337 sc->sc_worker = NULL; 1338 } else { 1339 g_topology_lock(); 1340 g_mirror_destroy_device(sc); 1341 g_topology_unlock(); 1342 free(sc, M_MIRROR); 1343 } 1344 kthread_exit(0); 1345 } 1346 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1347 continue; 1348 } 1349 /* 1350 * Now I/O requests. 1351 */ 1352 /* Get first request from the queue. */ 1353 mtx_lock(&sc->sc_queue_mtx); 1354 bp = bioq_first(&sc->sc_queue); 1355 if (bp == NULL) { 1356 if ((sc->sc_flags & 1357 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1358 mtx_unlock(&sc->sc_queue_mtx); 1359 goto end; 1360 } 1361 } 1362 if (sc->sc_sync.ds_ndisks > 0 && 1363 (bp == NULL || nreqs > g_mirror_reqs_per_sync)) { 1364 mtx_unlock(&sc->sc_queue_mtx); 1365 /* 1366 * It is time for synchronization... 1367 */ 1368 nreqs = 0; 1369 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1370 if (disk->d_state != 1371 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 1372 continue; 1373 } 1374 if (disk->d_sync.ds_offset >= 1375 sc->sc_provider->mediasize) { 1376 continue; 1377 } 1378 if (disk->d_sync.ds_offset > 1379 disk->d_sync.ds_offset_done) { 1380 continue; 1381 } 1382 g_mirror_sync_one(disk); 1383 } 1384 G_MIRROR_DEBUG(5, "%s: I'm here 2.", __func__); 1385 goto sleep; 1386 } 1387 if (bp == NULL) { 1388 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 0); 1389 G_MIRROR_DEBUG(5, "%s: I'm here 3.", __func__); 1390 continue; 1391 } 1392 nreqs++; 1393 bioq_remove(&sc->sc_queue, bp); 1394 mtx_unlock(&sc->sc_queue_mtx); 1395 1396 if ((bp->bio_flags & BIO_FLAG1) != 0) { 1397 g_mirror_regular_request(bp); 1398 } else if ((bp->bio_flags & BIO_FLAG2) != 0) { 1399 u_int timeout, sps; 1400 1401 g_mirror_sync_request(bp); 1402 sleep: 1403 sps = atomic_load_acq_int(&g_mirror_syncs_per_sec); 1404 if (sps == 0) { 1405 G_MIRROR_DEBUG(5, "%s: I'm here 5.", __func__); 1406 continue; 1407 } 1408 mtx_lock(&sc->sc_queue_mtx); 1409 if (bioq_first(&sc->sc_queue) != NULL) { 1410 mtx_unlock(&sc->sc_queue_mtx); 1411 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1412 continue; 1413 } 1414 timeout = hz / sps; 1415 if (timeout == 0) 1416 timeout = 1; 1417 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w2", 1418 timeout); 1419 } else { 1420 g_mirror_register_request(bp); 1421 } 1422 G_MIRROR_DEBUG(5, "%s: I'm here 6.", __func__); 1423 } 1424 } 1425 1426 /* 1427 * Open disk's consumer if needed. 1428 */ 1429 static void 1430 g_mirror_update_access(struct g_mirror_disk *disk) 1431 { 1432 struct g_provider *pp; 1433 struct g_consumer *cp; 1434 int acr, acw, ace, cpw, error; 1435 1436 g_topology_assert(); 1437 1438 cp = disk->d_consumer; 1439 pp = disk->d_softc->sc_provider; 1440 if (pp == NULL) { 1441 acr = -cp->acr; 1442 acw = -cp->acw; 1443 ace = -cp->ace; 1444 } else { 1445 acr = pp->acr - cp->acr; 1446 acw = pp->acw - cp->acw; 1447 ace = pp->ace - cp->ace; 1448 /* Grab an extra "exclusive" bit. */ 1449 if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0) 1450 ace++; 1451 } 1452 if (acr == 0 && acw == 0 && ace == 0) 1453 return; 1454 cpw = cp->acw; 1455 error = g_access(cp, acr, acw, ace); 1456 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, acr, 1457 acw, ace, error); 1458 if (error != 0) { 1459 disk->d_softc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1460 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1461 G_MIRROR_EVENT_DONTWAIT); 1462 return; 1463 } 1464 if (cpw == 0 && cp->acw > 0) { 1465 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1466 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1467 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1468 } else if (cpw > 0 && cp->acw == 0) { 1469 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1470 g_mirror_get_diskname(disk), disk->d_softc->sc_name); 1471 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1472 } 1473 } 1474 1475 static void 1476 g_mirror_sync_start(struct g_mirror_disk *disk) 1477 { 1478 struct g_mirror_softc *sc; 1479 struct g_consumer *cp; 1480 int error; 1481 1482 g_topology_assert(); 1483 1484 sc = disk->d_softc; 1485 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1486 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1487 sc->sc_state)); 1488 cp = disk->d_consumer; 1489 KASSERT(cp->acr == 0 && cp->acw == 0 && cp->ace == 0, 1490 ("Consumer %s already opened.", cp->provider->name)); 1491 1492 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1493 g_mirror_get_diskname(disk)); 1494 error = g_access(cp, 0, 1, 1); 1495 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, 1, 1496 1, error); 1497 if (error != 0) { 1498 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 1499 G_MIRROR_EVENT_DONTWAIT); 1500 return; 1501 } 1502 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1503 KASSERT(disk->d_sync.ds_consumer == NULL, 1504 ("Sync consumer already exists (device=%s, disk=%s).", 1505 sc->sc_name, g_mirror_get_diskname(disk))); 1506 disk->d_sync.ds_consumer = g_new_consumer(sc->sc_sync.ds_geom); 1507 disk->d_sync.ds_consumer->private = disk; 1508 error = g_attach(disk->d_sync.ds_consumer, disk->d_softc->sc_provider); 1509 KASSERT(error == 0, ("Cannot attach to %s (error=%d).", 1510 disk->d_softc->sc_name, error)); 1511 error = g_access(disk->d_sync.ds_consumer, 1, 0, 0); 1512 KASSERT(error == 0, ("Cannot open %s (error=%d).", 1513 disk->d_softc->sc_name, error)); 1514 sc->sc_sync.ds_ndisks++; 1515 } 1516 1517 /* 1518 * Stop synchronization process. 1519 * type: 0 - synchronization finished 1520 * 1 - synchronization stopped 1521 */ 1522 static void 1523 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1524 { 1525 struct g_consumer *cp; 1526 1527 g_topology_assert(); 1528 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1529 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1530 g_mirror_disk_state2str(disk->d_state))); 1531 if (disk->d_sync.ds_consumer == NULL) 1532 return; 1533 1534 if (type == 0) { 1535 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 1536 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1537 } else /* if (type == 1) */ { 1538 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 1539 disk->d_softc->sc_name, g_mirror_get_diskname(disk)); 1540 } 1541 cp = disk->d_sync.ds_consumer; 1542 g_access(cp, -1, 0, 0); 1543 g_mirror_kill_consumer(disk->d_softc, cp); 1544 disk->d_sync.ds_consumer = NULL; 1545 disk->d_softc->sc_sync.ds_ndisks--; 1546 cp = disk->d_consumer; 1547 KASSERT(cp->acr == 0 && cp->acw == 1 && cp->ace == 1, 1548 ("Consumer %s not opened.", cp->provider->name)); 1549 g_access(cp, 0, -1, -1); 1550 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", cp->provider->name, 0, -1, 1551 -1, 0); 1552 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1553 } 1554 1555 static void 1556 g_mirror_launch_provider(struct g_mirror_softc *sc) 1557 { 1558 struct g_mirror_disk *disk; 1559 struct g_provider *pp; 1560 1561 g_topology_assert(); 1562 1563 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 1564 pp->mediasize = sc->sc_mediasize; 1565 pp->sectorsize = sc->sc_sectorsize; 1566 sc->sc_provider = pp; 1567 g_error_provider(pp, 0); 1568 G_MIRROR_DEBUG(0, "Device %s: provider %s launched.", sc->sc_name, 1569 pp->name); 1570 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1571 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1572 g_mirror_sync_start(disk); 1573 } 1574 } 1575 1576 static void 1577 g_mirror_destroy_provider(struct g_mirror_softc *sc) 1578 { 1579 struct g_mirror_disk *disk; 1580 struct bio *bp; 1581 1582 g_topology_assert(); 1583 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 1584 sc->sc_name)); 1585 1586 g_error_provider(sc->sc_provider, ENXIO); 1587 mtx_lock(&sc->sc_queue_mtx); 1588 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 1589 bioq_remove(&sc->sc_queue, bp); 1590 g_io_deliver(bp, ENXIO); 1591 } 1592 mtx_unlock(&sc->sc_queue_mtx); 1593 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 1594 sc->sc_provider->name); 1595 sc->sc_provider->flags |= G_PF_WITHER; 1596 g_orphan_provider(sc->sc_provider, ENXIO); 1597 sc->sc_provider = NULL; 1598 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1599 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 1600 g_mirror_sync_stop(disk, 1); 1601 } 1602 } 1603 1604 static void 1605 g_mirror_go(void *arg) 1606 { 1607 struct g_mirror_softc *sc; 1608 1609 sc = arg; 1610 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 1611 g_mirror_event_send(sc, 0, 1612 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 1613 } 1614 1615 static u_int 1616 g_mirror_determine_state(struct g_mirror_disk *disk) 1617 { 1618 struct g_mirror_softc *sc; 1619 u_int state; 1620 1621 sc = disk->d_softc; 1622 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 1623 if ((disk->d_flags & 1624 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1625 /* Disk does not need synchronization. */ 1626 state = G_MIRROR_DISK_STATE_ACTIVE; 1627 } else { 1628 if ((sc->sc_flags & 1629 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1630 (disk->d_flags & 1631 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1632 /* 1633 * We can start synchronization from 1634 * the stored offset. 1635 */ 1636 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1637 } else { 1638 state = G_MIRROR_DISK_STATE_STALE; 1639 } 1640 } 1641 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 1642 /* 1643 * Reset all synchronization data for this disk, 1644 * because if it even was synchronized, it was 1645 * synchronized to disks with different syncid. 1646 */ 1647 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 1648 disk->d_sync.ds_offset = 0; 1649 disk->d_sync.ds_offset_done = 0; 1650 disk->d_sync.ds_syncid = sc->sc_syncid; 1651 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 1652 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 1653 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 1654 } else { 1655 state = G_MIRROR_DISK_STATE_STALE; 1656 } 1657 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 1658 /* 1659 * Not good, NOT GOOD! 1660 * It means that mirror was started on stale disks 1661 * and more fresh disk just arrive. 1662 * If there were writes, mirror is fucked up, sorry. 1663 * I think the best choice here is don't touch 1664 * this disk and inform the user laudly. 1665 */ 1666 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 1667 "disk (%s) arrives!! It will not be connected to the " 1668 "running device.", sc->sc_name, 1669 g_mirror_get_diskname(disk)); 1670 g_mirror_destroy_disk(disk); 1671 state = G_MIRROR_DISK_STATE_NONE; 1672 /* Return immediately, because disk was destroyed. */ 1673 return (state); 1674 } 1675 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 1676 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 1677 return (state); 1678 } 1679 1680 /* 1681 * Update device state. 1682 */ 1683 static void 1684 g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 1685 { 1686 struct g_mirror_disk *disk; 1687 u_int state; 1688 1689 g_topology_assert(); 1690 1691 switch (sc->sc_state) { 1692 case G_MIRROR_DEVICE_STATE_STARTING: 1693 { 1694 struct g_mirror_disk *pdisk; 1695 u_int dirty, ndisks, syncid; 1696 1697 KASSERT(sc->sc_provider == NULL, 1698 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 1699 /* 1700 * Are we ready? We are, if all disks are connected or 1701 * if we have any disks and 'force' is true. 1702 */ 1703 if ((force && g_mirror_ndisks(sc, -1) > 0) || 1704 sc->sc_ndisks == g_mirror_ndisks(sc, -1)) { 1705 ; 1706 } else if (g_mirror_ndisks(sc, -1) == 0) { 1707 /* 1708 * Disks went down in starting phase, so destroy 1709 * device. 1710 */ 1711 callout_drain(&sc->sc_callout); 1712 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1713 return; 1714 } else { 1715 return; 1716 } 1717 1718 /* 1719 * Activate all disks with the biggest syncid. 1720 */ 1721 if (force) { 1722 /* 1723 * If called with 'force' true, we're called from 1724 * timeout * procedure, so don't bother canceling 1725 * timeout. 1726 */ 1727 ndisks = 0; 1728 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1729 if ((disk->d_flags & 1730 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 1731 ndisks++; 1732 } 1733 } 1734 if (ndisks == 0) { 1735 /* No valid disks found, destroy device. */ 1736 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1737 return; 1738 } 1739 } else { 1740 /* Cancel timeout. */ 1741 callout_drain(&sc->sc_callout); 1742 } 1743 1744 /* 1745 * Find disk with the biggest syncid. 1746 */ 1747 syncid = 0; 1748 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1749 if (disk->d_sync.ds_syncid > syncid) 1750 syncid = disk->d_sync.ds_syncid; 1751 } 1752 1753 /* 1754 * Here we need to look for dirty disks and if all disks 1755 * with the biggest syncid are dirty, we have to choose 1756 * one with the biggest priority and rebuild the rest. 1757 */ 1758 /* 1759 * Find the number of dirty disks with the biggest syncid. 1760 * Find the number of disks with the biggest syncid. 1761 * While here, find a disk with the biggest priority. 1762 */ 1763 dirty = ndisks = 0; 1764 pdisk = NULL; 1765 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1766 if (disk->d_sync.ds_syncid != syncid) 1767 continue; 1768 if ((disk->d_flags & 1769 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1770 continue; 1771 } 1772 ndisks++; 1773 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1774 dirty++; 1775 if (pdisk == NULL || 1776 pdisk->d_priority < disk->d_priority) { 1777 pdisk = disk; 1778 } 1779 } 1780 } 1781 if (dirty == 0) { 1782 /* No dirty disks at all, great. */ 1783 } else if (dirty == ndisks) { 1784 /* 1785 * Force synchronization for all dirty disks except one 1786 * with the biggest priority. 1787 */ 1788 KASSERT(pdisk != NULL, ("pdisk == NULL")); 1789 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 1790 "master disk for synchronization.", 1791 g_mirror_get_diskname(pdisk), sc->sc_name); 1792 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1793 if (disk->d_sync.ds_syncid != syncid) 1794 continue; 1795 if ((disk->d_flags & 1796 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1797 continue; 1798 } 1799 KASSERT((disk->d_flags & 1800 G_MIRROR_DISK_FLAG_DIRTY) != 0, 1801 ("Disk %s isn't marked as dirty.", 1802 g_mirror_get_diskname(disk))); 1803 /* Skip the disk with the biggest priority. */ 1804 if (disk == pdisk) 1805 continue; 1806 disk->d_sync.ds_syncid = 0; 1807 } 1808 } else if (dirty < ndisks) { 1809 /* 1810 * Force synchronization for all dirty disks. 1811 * We have some non-dirty disks. 1812 */ 1813 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1814 if (disk->d_sync.ds_syncid != syncid) 1815 continue; 1816 if ((disk->d_flags & 1817 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 1818 continue; 1819 } 1820 if ((disk->d_flags & 1821 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1822 continue; 1823 } 1824 disk->d_sync.ds_syncid = 0; 1825 } 1826 } 1827 1828 /* Reset hint. */ 1829 sc->sc_hint = NULL; 1830 sc->sc_syncid = syncid; 1831 if (force) { 1832 /* Remember to bump syncid on first write. */ 1833 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 1834 } 1835 state = G_MIRROR_DEVICE_STATE_RUNNING; 1836 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 1837 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 1838 g_mirror_device_state2str(state)); 1839 sc->sc_state = state; 1840 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1841 state = g_mirror_determine_state(disk); 1842 g_mirror_event_send(disk, state, 1843 G_MIRROR_EVENT_DONTWAIT); 1844 if (state == G_MIRROR_DISK_STATE_STALE) { 1845 sc->sc_bump_syncid = 1846 G_MIRROR_BUMP_ON_FIRST_WRITE; 1847 } 1848 } 1849 break; 1850 } 1851 case G_MIRROR_DEVICE_STATE_RUNNING: 1852 /* 1853 * Bump syncid here, if we need to do it immediately. 1854 */ 1855 if (sc->sc_bump_syncid == G_MIRROR_BUMP_IMMEDIATELY) { 1856 sc->sc_bump_syncid = 0; 1857 g_mirror_bump_syncid(sc); 1858 } 1859 if (g_mirror_ndisks(sc, -1) == 0) { 1860 /* 1861 * No disks at all, we need to destroy device. 1862 */ 1863 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 1864 } else if (g_mirror_ndisks(sc, 1865 G_MIRROR_DISK_STATE_ACTIVE) == 0 && 1866 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 1867 /* 1868 * No active disks, destroy provider. 1869 */ 1870 if (sc->sc_provider != NULL) 1871 g_mirror_destroy_provider(sc); 1872 } else if (g_mirror_ndisks(sc, 1873 G_MIRROR_DISK_STATE_ACTIVE) > 0) { 1874 /* 1875 * We have active disks, launch provider if it doesn't 1876 * exist. 1877 */ 1878 if (sc->sc_provider == NULL) 1879 g_mirror_launch_provider(sc); 1880 } 1881 break; 1882 default: 1883 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 1884 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 1885 break; 1886 } 1887 } 1888 1889 /* 1890 * Update disk state and device state if needed. 1891 */ 1892 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 1893 "Disk %s state changed from %s to %s (device %s).", \ 1894 g_mirror_get_diskname(disk), \ 1895 g_mirror_disk_state2str(disk->d_state), \ 1896 g_mirror_disk_state2str(state), sc->sc_name) 1897 static int 1898 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 1899 { 1900 struct g_mirror_softc *sc; 1901 1902 g_topology_assert(); 1903 1904 sc = disk->d_softc; 1905 again: 1906 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 1907 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 1908 g_mirror_disk_state2str(state)); 1909 switch (state) { 1910 case G_MIRROR_DISK_STATE_NEW: 1911 /* 1912 * Possible scenarios: 1913 * 1. New disk arrive. 1914 */ 1915 /* Previous state should be NONE. */ 1916 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 1917 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1918 g_mirror_disk_state2str(disk->d_state))); 1919 DISK_STATE_CHANGED(); 1920 1921 disk->d_state = state; 1922 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 1923 G_MIRROR_DEBUG(0, "Device %s: provider %s detected.", 1924 sc->sc_name, g_mirror_get_diskname(disk)); 1925 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 1926 break; 1927 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1928 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1929 g_mirror_device_state2str(sc->sc_state), 1930 g_mirror_get_diskname(disk), 1931 g_mirror_disk_state2str(disk->d_state))); 1932 state = g_mirror_determine_state(disk); 1933 if (state != G_MIRROR_DISK_STATE_NONE) 1934 goto again; 1935 break; 1936 case G_MIRROR_DISK_STATE_ACTIVE: 1937 /* 1938 * Possible scenarios: 1939 * 1. New disk does not need synchronization. 1940 * 2. Synchronization process finished successfully. 1941 */ 1942 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1943 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1944 g_mirror_device_state2str(sc->sc_state), 1945 g_mirror_get_diskname(disk), 1946 g_mirror_disk_state2str(disk->d_state))); 1947 /* Previous state should be NEW or SYNCHRONIZING. */ 1948 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 1949 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1950 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1951 g_mirror_disk_state2str(disk->d_state))); 1952 DISK_STATE_CHANGED(); 1953 1954 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 1955 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1956 else if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 1957 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 1958 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 1959 g_mirror_sync_stop(disk, 0); 1960 } 1961 disk->d_state = state; 1962 disk->d_sync.ds_offset = 0; 1963 disk->d_sync.ds_offset_done = 0; 1964 g_mirror_update_access(disk); 1965 g_mirror_update_metadata(disk); 1966 G_MIRROR_DEBUG(0, "Device %s: provider %s activated.", 1967 sc->sc_name, g_mirror_get_diskname(disk)); 1968 break; 1969 case G_MIRROR_DISK_STATE_STALE: 1970 /* 1971 * Possible scenarios: 1972 * 1. Stale disk was connected. 1973 */ 1974 /* Previous state should be NEW. */ 1975 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 1976 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 1977 g_mirror_disk_state2str(disk->d_state))); 1978 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1979 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1980 g_mirror_device_state2str(sc->sc_state), 1981 g_mirror_get_diskname(disk), 1982 g_mirror_disk_state2str(disk->d_state))); 1983 /* 1984 * STALE state is only possible if device is marked 1985 * NOAUTOSYNC. 1986 */ 1987 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 1988 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 1989 g_mirror_device_state2str(sc->sc_state), 1990 g_mirror_get_diskname(disk), 1991 g_mirror_disk_state2str(disk->d_state))); 1992 DISK_STATE_CHANGED(); 1993 1994 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1995 disk->d_state = state; 1996 g_mirror_update_metadata(disk); 1997 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 1998 sc->sc_name, g_mirror_get_diskname(disk)); 1999 break; 2000 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2001 /* 2002 * Possible scenarios: 2003 * 1. Disk which needs synchronization was connected. 2004 */ 2005 /* Previous state should be NEW. */ 2006 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2007 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2008 g_mirror_disk_state2str(disk->d_state))); 2009 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2010 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2011 g_mirror_device_state2str(sc->sc_state), 2012 g_mirror_get_diskname(disk), 2013 g_mirror_disk_state2str(disk->d_state))); 2014 DISK_STATE_CHANGED(); 2015 2016 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2017 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2018 disk->d_state = state; 2019 if (sc->sc_provider != NULL) { 2020 g_mirror_sync_start(disk); 2021 g_mirror_update_metadata(disk); 2022 } 2023 break; 2024 case G_MIRROR_DISK_STATE_DISCONNECTED: 2025 /* 2026 * Possible scenarios: 2027 * 1. Device wasn't running yet, but disk disappear. 2028 * 2. Disk was active and disapppear. 2029 * 3. Disk disappear during synchronization process. 2030 */ 2031 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2032 /* 2033 * Previous state should be ACTIVE, STALE or 2034 * SYNCHRONIZING. 2035 */ 2036 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2037 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2038 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2039 ("Wrong disk state (%s, %s).", 2040 g_mirror_get_diskname(disk), 2041 g_mirror_disk_state2str(disk->d_state))); 2042 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2043 /* Previous state should be NEW. */ 2044 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2045 ("Wrong disk state (%s, %s).", 2046 g_mirror_get_diskname(disk), 2047 g_mirror_disk_state2str(disk->d_state))); 2048 /* 2049 * Reset bumping syncid if disk disappeared in STARTING 2050 * state. 2051 */ 2052 if (sc->sc_bump_syncid == G_MIRROR_BUMP_ON_FIRST_WRITE) 2053 sc->sc_bump_syncid = 0; 2054 #ifdef INVARIANTS 2055 } else { 2056 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2057 sc->sc_name, 2058 g_mirror_device_state2str(sc->sc_state), 2059 g_mirror_get_diskname(disk), 2060 g_mirror_disk_state2str(disk->d_state))); 2061 #endif 2062 } 2063 DISK_STATE_CHANGED(); 2064 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2065 sc->sc_name, g_mirror_get_diskname(disk)); 2066 2067 g_mirror_destroy_disk(disk); 2068 break; 2069 case G_MIRROR_DISK_STATE_DESTROY: 2070 { 2071 int error; 2072 2073 error = g_mirror_clear_metadata(disk); 2074 if (error != 0) 2075 return (error); 2076 DISK_STATE_CHANGED(); 2077 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2078 sc->sc_name, g_mirror_get_diskname(disk)); 2079 2080 g_mirror_destroy_disk(disk); 2081 sc->sc_ndisks--; 2082 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2083 g_mirror_update_metadata(disk); 2084 } 2085 break; 2086 } 2087 default: 2088 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2089 break; 2090 } 2091 return (0); 2092 } 2093 #undef DISK_STATE_CHANGED 2094 2095 static int 2096 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2097 { 2098 struct g_provider *pp; 2099 u_char *buf; 2100 int error; 2101 2102 g_topology_assert(); 2103 2104 error = g_access(cp, 1, 0, 0); 2105 if (error != 0) 2106 return (error); 2107 pp = cp->provider; 2108 g_topology_unlock(); 2109 /* Metadata are stored on last sector. */ 2110 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2111 &error); 2112 g_topology_lock(); 2113 if (buf == NULL) { 2114 g_access(cp, -1, 0, 0); 2115 return (error); 2116 } 2117 if (error != 0) { 2118 g_access(cp, -1, 0, 0); 2119 g_free(buf); 2120 return (error); 2121 } 2122 error = g_access(cp, -1, 0, 0); 2123 KASSERT(error == 0, ("Cannot decrease access count for %s.", pp->name)); 2124 2125 /* Decode metadata. */ 2126 error = mirror_metadata_decode(buf, md); 2127 g_free(buf); 2128 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2129 return (EINVAL); 2130 if (error != 0) { 2131 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2132 cp->provider->name); 2133 return (error); 2134 } 2135 2136 return (0); 2137 } 2138 2139 static int 2140 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2141 struct g_mirror_metadata *md) 2142 { 2143 2144 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2145 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2146 pp->name, md->md_did); 2147 return (EEXIST); 2148 } 2149 if (md->md_all != sc->sc_ndisks) { 2150 G_MIRROR_DEBUG(1, 2151 "Invalid '%s' field on disk %s (device %s), skipping.", 2152 "md_all", pp->name, sc->sc_name); 2153 return (EINVAL); 2154 } 2155 if (md->md_slice != sc->sc_slice) { 2156 G_MIRROR_DEBUG(1, 2157 "Invalid '%s' field on disk %s (device %s), skipping.", 2158 "md_slice", pp->name, sc->sc_name); 2159 return (EINVAL); 2160 } 2161 if (md->md_balance != sc->sc_balance) { 2162 G_MIRROR_DEBUG(1, 2163 "Invalid '%s' field on disk %s (device %s), skipping.", 2164 "md_balance", pp->name, sc->sc_name); 2165 return (EINVAL); 2166 } 2167 if (md->md_mediasize != sc->sc_mediasize) { 2168 G_MIRROR_DEBUG(1, 2169 "Invalid '%s' field on disk %s (device %s), skipping.", 2170 "md_mediasize", pp->name, sc->sc_name); 2171 return (EINVAL); 2172 } 2173 if (sc->sc_mediasize > pp->mediasize) { 2174 G_MIRROR_DEBUG(1, 2175 "Invalid size of disk %s (device %s), skipping.", pp->name, 2176 sc->sc_name); 2177 return (EINVAL); 2178 } 2179 if (md->md_sectorsize != sc->sc_sectorsize) { 2180 G_MIRROR_DEBUG(1, 2181 "Invalid '%s' field on disk %s (device %s), skipping.", 2182 "md_sectorsize", pp->name, sc->sc_name); 2183 return (EINVAL); 2184 } 2185 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2186 G_MIRROR_DEBUG(1, 2187 "Invalid sector size of disk %s (device %s), skipping.", 2188 pp->name, sc->sc_name); 2189 return (EINVAL); 2190 } 2191 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2192 G_MIRROR_DEBUG(1, 2193 "Invalid device flags on disk %s (device %s), skipping.", 2194 pp->name, sc->sc_name); 2195 return (EINVAL); 2196 } 2197 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2198 G_MIRROR_DEBUG(1, 2199 "Invalid disk flags on disk %s (device %s), skipping.", 2200 pp->name, sc->sc_name); 2201 return (EINVAL); 2202 } 2203 return (0); 2204 } 2205 2206 static int 2207 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2208 struct g_mirror_metadata *md) 2209 { 2210 struct g_mirror_disk *disk; 2211 int error; 2212 2213 g_topology_assert(); 2214 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2215 2216 error = g_mirror_check_metadata(sc, pp, md); 2217 if (error != 0) 2218 return (error); 2219 disk = g_mirror_init_disk(sc, pp, md, &error); 2220 if (disk == NULL) 2221 return (error); 2222 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2223 G_MIRROR_EVENT_WAIT); 2224 return (error); 2225 } 2226 2227 static int 2228 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2229 { 2230 struct g_mirror_softc *sc; 2231 struct g_mirror_disk *disk; 2232 int dcr, dcw, dce, err, error; 2233 2234 g_topology_assert(); 2235 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2236 acw, ace); 2237 2238 dcr = pp->acr + acr; 2239 dcw = pp->acw + acw; 2240 dce = pp->ace + ace; 2241 2242 /* On first open, grab an extra "exclusive" bit */ 2243 if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) 2244 ace++; 2245 /* ... and let go of it on last close */ 2246 if (dcr == 0 && dcw == 0 && dce == 0) 2247 ace--; 2248 2249 sc = pp->geom->softc; 2250 if (sc == NULL || LIST_EMPTY(&sc->sc_disks)) { 2251 if (acr <= 0 && acw <= 0 && ace <= 0) 2252 return (0); 2253 else 2254 return (ENXIO); 2255 } 2256 error = ENXIO; 2257 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2258 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 2259 continue; 2260 err = g_access(disk->d_consumer, acr, acw, ace); 2261 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", 2262 g_mirror_get_diskname(disk), acr, acw, ace, err); 2263 if (err == 0) { 2264 /* 2265 * Mark disk as dirty on open and unmark on close. 2266 */ 2267 if (pp->acw == 0 && dcw > 0) { 2268 G_MIRROR_DEBUG(1, 2269 "Disk %s (device %s) marked as dirty.", 2270 g_mirror_get_diskname(disk), sc->sc_name); 2271 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2272 g_mirror_update_metadata(disk); 2273 } else if (pp->acw > 0 && dcw == 0) { 2274 G_MIRROR_DEBUG(1, 2275 "Disk %s (device %s) marked as clean.", 2276 g_mirror_get_diskname(disk), sc->sc_name); 2277 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2278 g_mirror_update_metadata(disk); 2279 } 2280 error = 0; 2281 } else { 2282 sc->sc_bump_syncid = G_MIRROR_BUMP_ON_FIRST_WRITE; 2283 g_mirror_event_send(disk, 2284 G_MIRROR_DISK_STATE_DISCONNECTED, 2285 G_MIRROR_EVENT_DONTWAIT); 2286 } 2287 } 2288 return (error); 2289 } 2290 2291 static struct g_geom * 2292 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2293 { 2294 struct g_mirror_softc *sc; 2295 struct g_geom *gp; 2296 int error, timeout; 2297 2298 g_topology_assert(); 2299 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2300 md->md_mid); 2301 2302 /* One disk is minimum. */ 2303 if (md->md_all < 1) 2304 return (NULL); 2305 /* 2306 * Action geom. 2307 */ 2308 gp = g_new_geomf(mp, "%s", md->md_name); 2309 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2310 gp->start = g_mirror_start; 2311 gp->spoiled = g_mirror_spoiled; 2312 gp->orphan = g_mirror_orphan; 2313 gp->access = g_mirror_access; 2314 gp->dumpconf = g_mirror_dumpconf; 2315 2316 sc->sc_id = md->md_mid; 2317 sc->sc_slice = md->md_slice; 2318 sc->sc_balance = md->md_balance; 2319 sc->sc_mediasize = md->md_mediasize; 2320 sc->sc_sectorsize = md->md_sectorsize; 2321 sc->sc_ndisks = md->md_all; 2322 sc->sc_flags = md->md_mflags; 2323 sc->sc_bump_syncid = 0; 2324 bioq_init(&sc->sc_queue); 2325 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2326 LIST_INIT(&sc->sc_disks); 2327 TAILQ_INIT(&sc->sc_events); 2328 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2329 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2330 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2331 gp->softc = sc; 2332 sc->sc_geom = gp; 2333 sc->sc_provider = NULL; 2334 /* 2335 * Synchronization geom. 2336 */ 2337 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2338 gp->softc = sc; 2339 gp->spoiled = g_mirror_spoiled; 2340 gp->orphan = g_mirror_orphan; 2341 sc->sc_sync.ds_geom = gp; 2342 sc->sc_sync.ds_block = atomic_load_acq_int(&g_mirror_sync_block_size); 2343 sc->sc_sync.ds_ndisks = 0; 2344 sc->sc_sync.ds_zone = uma_zcreate("gmirror:sync", sc->sc_sync.ds_block, 2345 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 2346 error = kthread_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2347 "g_mirror %s", md->md_name); 2348 if (error != 0) { 2349 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2350 sc->sc_name); 2351 uma_zdestroy(sc->sc_sync.ds_zone); 2352 g_destroy_geom(sc->sc_sync.ds_geom); 2353 mtx_destroy(&sc->sc_events_mtx); 2354 mtx_destroy(&sc->sc_queue_mtx); 2355 g_destroy_geom(sc->sc_geom); 2356 free(sc, M_MIRROR); 2357 return (NULL); 2358 } 2359 2360 G_MIRROR_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id); 2361 2362 /* 2363 * Run timeout. 2364 */ 2365 timeout = atomic_load_acq_int(&g_mirror_timeout); 2366 callout_reset(&sc->sc_callout, timeout * hz, g_mirror_go, sc); 2367 return (sc->sc_geom); 2368 } 2369 2370 int 2371 g_mirror_destroy(struct g_mirror_softc *sc, boolean_t force) 2372 { 2373 struct g_provider *pp; 2374 2375 g_topology_assert(); 2376 2377 if (sc == NULL) 2378 return (ENXIO); 2379 pp = sc->sc_provider; 2380 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2381 if (force) { 2382 G_MIRROR_DEBUG(0, "Device %s is still open, so it " 2383 "can't be definitely removed.", pp->name); 2384 } else { 2385 G_MIRROR_DEBUG(1, 2386 "Device %s is still open (r%dw%de%d).", pp->name, 2387 pp->acr, pp->acw, pp->ace); 2388 return (EBUSY); 2389 } 2390 } 2391 2392 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2393 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2394 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2395 mtx_lock(&sc->sc_queue_mtx); 2396 wakeup(sc); 2397 mtx_unlock(&sc->sc_queue_mtx); 2398 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2399 while (sc->sc_worker != NULL) 2400 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2401 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2402 g_mirror_destroy_device(sc); 2403 free(sc, M_MIRROR); 2404 return (0); 2405 } 2406 2407 static void 2408 g_mirror_taste_orphan(struct g_consumer *cp) 2409 { 2410 2411 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 2412 cp->provider->name)); 2413 } 2414 2415 static struct g_geom * 2416 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 2417 { 2418 struct g_mirror_metadata md; 2419 struct g_mirror_softc *sc; 2420 struct g_consumer *cp; 2421 struct g_geom *gp; 2422 int error; 2423 2424 g_topology_assert(); 2425 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 2426 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 2427 2428 gp = g_new_geomf(mp, "mirror:taste"); 2429 /* 2430 * This orphan function should be never called. 2431 */ 2432 gp->orphan = g_mirror_taste_orphan; 2433 cp = g_new_consumer(gp); 2434 g_attach(cp, pp); 2435 error = g_mirror_read_metadata(cp, &md); 2436 g_detach(cp); 2437 g_destroy_consumer(cp); 2438 g_destroy_geom(gp); 2439 if (error != 0) 2440 return (NULL); 2441 gp = NULL; 2442 2443 if (md.md_version > G_MIRROR_VERSION) { 2444 printf("geom_mirror.ko module is too old to handle %s.\n", 2445 pp->name); 2446 return (NULL); 2447 } 2448 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 2449 G_MIRROR_DEBUG(0, 2450 "Device %s: provider %s marked as inactive, skipping.", 2451 md.md_name, pp->name); 2452 return (NULL); 2453 } 2454 if (g_mirror_debug >= 2) 2455 mirror_metadata_dump(&md); 2456 2457 /* 2458 * Let's check if device already exists. 2459 */ 2460 LIST_FOREACH(gp, &mp->geom, geom) { 2461 sc = gp->softc; 2462 if (sc == NULL) 2463 continue; 2464 if (sc->sc_sync.ds_geom == gp) 2465 continue; 2466 if (strcmp(md.md_name, sc->sc_name) != 0) 2467 continue; 2468 if (md.md_mid != sc->sc_id) { 2469 G_MIRROR_DEBUG(0, "Device %s already configured.", 2470 sc->sc_name); 2471 return (NULL); 2472 } 2473 break; 2474 } 2475 if (gp == NULL) { 2476 gp = g_mirror_create(mp, &md); 2477 if (gp == NULL) { 2478 G_MIRROR_DEBUG(0, "Cannot create device %s.mirror", 2479 md.md_name); 2480 return (NULL); 2481 } 2482 sc = gp->softc; 2483 } 2484 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 2485 error = g_mirror_add_disk(sc, pp, &md); 2486 if (error != 0) { 2487 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 2488 pp->name, gp->name, error); 2489 if (LIST_EMPTY(&sc->sc_disks)) 2490 g_mirror_destroy(sc, 1); 2491 return (NULL); 2492 } 2493 return (gp); 2494 } 2495 2496 static int 2497 g_mirror_destroy_geom(struct gctl_req *req __unused, 2498 struct g_class *mp __unused, struct g_geom *gp) 2499 { 2500 2501 return (g_mirror_destroy(gp->softc, 0)); 2502 } 2503 2504 static void 2505 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 2506 struct g_consumer *cp, struct g_provider *pp) 2507 { 2508 struct g_mirror_softc *sc; 2509 2510 g_topology_assert(); 2511 2512 sc = gp->softc; 2513 if (sc == NULL) 2514 return; 2515 /* Skip synchronization geom. */ 2516 if (gp == sc->sc_sync.ds_geom) 2517 return; 2518 if (pp != NULL) { 2519 /* Nothing here. */ 2520 } else if (cp != NULL) { 2521 struct g_mirror_disk *disk; 2522 2523 disk = cp->private; 2524 if (disk == NULL) 2525 return; 2526 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 2527 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2528 sbuf_printf(sb, "%s<Synchronized>", indent); 2529 if (disk->d_sync.ds_offset_done == 0) 2530 sbuf_printf(sb, "0%%"); 2531 else { 2532 sbuf_printf(sb, "%u%%", 2533 (u_int)((disk->d_sync.ds_offset_done * 100) / 2534 sc->sc_provider->mediasize)); 2535 } 2536 sbuf_printf(sb, "</Synchronized>\n"); 2537 } 2538 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 2539 disk->d_sync.ds_syncid); 2540 sbuf_printf(sb, "%s<Flags>", indent); 2541 if (disk->d_flags == 0) 2542 sbuf_printf(sb, "NONE"); 2543 else { 2544 int first = 1; 2545 2546 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2547 if (!first) 2548 sbuf_printf(sb, ", "); 2549 else 2550 first = 0; 2551 sbuf_printf(sb, "DIRTY"); 2552 } 2553 if ((disk->d_flags & 2554 G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 2555 if (!first) 2556 sbuf_printf(sb, ", "); 2557 else 2558 first = 0; 2559 sbuf_printf(sb, "INACTIVE"); 2560 } 2561 if ((disk->d_flags & 2562 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2563 if (!first) 2564 sbuf_printf(sb, ", "); 2565 else 2566 first = 0; 2567 sbuf_printf(sb, "SYNCHRONIZING"); 2568 } 2569 if ((disk->d_flags & 2570 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2571 if (!first) 2572 sbuf_printf(sb, ", "); 2573 else 2574 first = 0; 2575 sbuf_printf(sb, "FORCE_SYNC"); 2576 } 2577 } 2578 sbuf_printf(sb, "</Flags>\n"); 2579 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 2580 disk->d_priority); 2581 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 2582 g_mirror_disk_state2str(disk->d_state)); 2583 } else { 2584 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 2585 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 2586 sbuf_printf(sb, "%s<Flags>", indent); 2587 if (sc->sc_flags == 0) 2588 sbuf_printf(sb, "NONE"); 2589 else { 2590 int first = 1; 2591 2592 if ((sc->sc_flags & 2593 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0) { 2594 if (!first) 2595 sbuf_printf(sb, ", "); 2596 else 2597 first = 0; 2598 sbuf_printf(sb, "NOAUTOSYNC"); 2599 } 2600 } 2601 sbuf_printf(sb, "</Flags>\n"); 2602 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 2603 (u_int)sc->sc_slice); 2604 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 2605 balance_name(sc->sc_balance)); 2606 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 2607 sc->sc_ndisks); 2608 } 2609 } 2610 2611 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 2612