1 /*- 2 * Copyright (c) 2004-2006 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/sbuf.h> 39 #include <sys/sysctl.h> 40 #include <sys/malloc.h> 41 #include <sys/eventhandler.h> 42 #include <vm/uma.h> 43 #include <geom/geom.h> 44 #include <sys/proc.h> 45 #include <sys/kthread.h> 46 #include <sys/sched.h> 47 #include <geom/mirror/g_mirror.h> 48 49 FEATURE(geom_mirror, "GEOM mirroring support"); 50 51 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 52 53 SYSCTL_DECL(_kern_geom); 54 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 55 "GEOM_MIRROR stuff"); 56 u_int g_mirror_debug = 0; 57 TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 58 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 59 "Debug level"); 60 static u_int g_mirror_timeout = 4; 61 TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 62 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 63 0, "Time to wait on all mirror components"); 64 static u_int g_mirror_idletime = 5; 65 TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 66 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 67 &g_mirror_idletime, 0, "Mark components as clean when idling"); 68 static u_int g_mirror_disconnect_on_failure = 1; 69 TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 70 &g_mirror_disconnect_on_failure); 71 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 72 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 73 static u_int g_mirror_syncreqs = 2; 74 TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 75 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 76 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 77 78 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 79 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 80 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 81 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 82 } while (0) 83 84 static eventhandler_tag g_mirror_post_sync = NULL; 85 static int g_mirror_shutdown = 0; 86 87 static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 88 struct g_geom *gp); 89 static g_taste_t g_mirror_taste; 90 static void g_mirror_init(struct g_class *mp); 91 static void g_mirror_fini(struct g_class *mp); 92 93 struct g_class g_mirror_class = { 94 .name = G_MIRROR_CLASS_NAME, 95 .version = G_VERSION, 96 .ctlreq = g_mirror_config, 97 .taste = g_mirror_taste, 98 .destroy_geom = g_mirror_destroy_geom, 99 .init = g_mirror_init, 100 .fini = g_mirror_fini 101 }; 102 103 104 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 105 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 106 static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 107 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 108 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 109 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 110 static void g_mirror_register_request(struct bio *bp); 111 static void g_mirror_sync_release(struct g_mirror_softc *sc); 112 113 114 static const char * 115 g_mirror_disk_state2str(int state) 116 { 117 118 switch (state) { 119 case G_MIRROR_DISK_STATE_NONE: 120 return ("NONE"); 121 case G_MIRROR_DISK_STATE_NEW: 122 return ("NEW"); 123 case G_MIRROR_DISK_STATE_ACTIVE: 124 return ("ACTIVE"); 125 case G_MIRROR_DISK_STATE_STALE: 126 return ("STALE"); 127 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 128 return ("SYNCHRONIZING"); 129 case G_MIRROR_DISK_STATE_DISCONNECTED: 130 return ("DISCONNECTED"); 131 case G_MIRROR_DISK_STATE_DESTROY: 132 return ("DESTROY"); 133 default: 134 return ("INVALID"); 135 } 136 } 137 138 static const char * 139 g_mirror_device_state2str(int state) 140 { 141 142 switch (state) { 143 case G_MIRROR_DEVICE_STATE_STARTING: 144 return ("STARTING"); 145 case G_MIRROR_DEVICE_STATE_RUNNING: 146 return ("RUNNING"); 147 default: 148 return ("INVALID"); 149 } 150 } 151 152 static const char * 153 g_mirror_get_diskname(struct g_mirror_disk *disk) 154 { 155 156 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 157 return ("[unknown]"); 158 return (disk->d_name); 159 } 160 161 /* 162 * --- Events handling functions --- 163 * Events in geom_mirror are used to maintain disks and device status 164 * from one thread to simplify locking. 165 */ 166 static void 167 g_mirror_event_free(struct g_mirror_event *ep) 168 { 169 170 free(ep, M_MIRROR); 171 } 172 173 int 174 g_mirror_event_send(void *arg, int state, int flags) 175 { 176 struct g_mirror_softc *sc; 177 struct g_mirror_disk *disk; 178 struct g_mirror_event *ep; 179 int error; 180 181 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 182 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 183 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 184 disk = NULL; 185 sc = arg; 186 } else { 187 disk = arg; 188 sc = disk->d_softc; 189 } 190 ep->e_disk = disk; 191 ep->e_state = state; 192 ep->e_flags = flags; 193 ep->e_error = 0; 194 mtx_lock(&sc->sc_events_mtx); 195 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 196 mtx_unlock(&sc->sc_events_mtx); 197 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 198 mtx_lock(&sc->sc_queue_mtx); 199 wakeup(sc); 200 mtx_unlock(&sc->sc_queue_mtx); 201 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 202 return (0); 203 sx_assert(&sc->sc_lock, SX_XLOCKED); 204 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 205 sx_xunlock(&sc->sc_lock); 206 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 207 mtx_lock(&sc->sc_events_mtx); 208 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 209 hz * 5); 210 } 211 error = ep->e_error; 212 g_mirror_event_free(ep); 213 sx_xlock(&sc->sc_lock); 214 return (error); 215 } 216 217 static struct g_mirror_event * 218 g_mirror_event_get(struct g_mirror_softc *sc) 219 { 220 struct g_mirror_event *ep; 221 222 mtx_lock(&sc->sc_events_mtx); 223 ep = TAILQ_FIRST(&sc->sc_events); 224 mtx_unlock(&sc->sc_events_mtx); 225 return (ep); 226 } 227 228 static void 229 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 230 { 231 232 mtx_lock(&sc->sc_events_mtx); 233 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 234 mtx_unlock(&sc->sc_events_mtx); 235 } 236 237 static void 238 g_mirror_event_cancel(struct g_mirror_disk *disk) 239 { 240 struct g_mirror_softc *sc; 241 struct g_mirror_event *ep, *tmpep; 242 243 sc = disk->d_softc; 244 sx_assert(&sc->sc_lock, SX_XLOCKED); 245 246 mtx_lock(&sc->sc_events_mtx); 247 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 248 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 249 continue; 250 if (ep->e_disk != disk) 251 continue; 252 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 253 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 254 g_mirror_event_free(ep); 255 else { 256 ep->e_error = ECANCELED; 257 wakeup(ep); 258 } 259 } 260 mtx_unlock(&sc->sc_events_mtx); 261 } 262 263 /* 264 * Return the number of disks in given state. 265 * If state is equal to -1, count all connected disks. 266 */ 267 u_int 268 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 269 { 270 struct g_mirror_disk *disk; 271 u_int n = 0; 272 273 sx_assert(&sc->sc_lock, SX_LOCKED); 274 275 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 276 if (state == -1 || disk->d_state == state) 277 n++; 278 } 279 return (n); 280 } 281 282 /* 283 * Find a disk in mirror by its disk ID. 284 */ 285 static struct g_mirror_disk * 286 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 287 { 288 struct g_mirror_disk *disk; 289 290 sx_assert(&sc->sc_lock, SX_XLOCKED); 291 292 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 293 if (disk->d_id == id) 294 return (disk); 295 } 296 return (NULL); 297 } 298 299 static u_int 300 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 301 { 302 struct bio *bp; 303 u_int nreqs = 0; 304 305 mtx_lock(&sc->sc_queue_mtx); 306 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 307 if (bp->bio_from == cp) 308 nreqs++; 309 } 310 mtx_unlock(&sc->sc_queue_mtx); 311 return (nreqs); 312 } 313 314 static int 315 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 316 { 317 318 if (cp->index > 0) { 319 G_MIRROR_DEBUG(2, 320 "I/O requests for %s exist, can't destroy it now.", 321 cp->provider->name); 322 return (1); 323 } 324 if (g_mirror_nrequests(sc, cp) > 0) { 325 G_MIRROR_DEBUG(2, 326 "I/O requests for %s in queue, can't destroy it now.", 327 cp->provider->name); 328 return (1); 329 } 330 return (0); 331 } 332 333 static void 334 g_mirror_destroy_consumer(void *arg, int flags __unused) 335 { 336 struct g_consumer *cp; 337 338 g_topology_assert(); 339 340 cp = arg; 341 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 342 g_detach(cp); 343 g_destroy_consumer(cp); 344 } 345 346 static void 347 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 348 { 349 struct g_provider *pp; 350 int retaste_wait; 351 352 g_topology_assert(); 353 354 cp->private = NULL; 355 if (g_mirror_is_busy(sc, cp)) 356 return; 357 pp = cp->provider; 358 retaste_wait = 0; 359 if (cp->acw == 1) { 360 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 361 retaste_wait = 1; 362 } 363 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 364 -cp->acw, -cp->ace, 0); 365 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 366 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 367 if (retaste_wait) { 368 /* 369 * After retaste event was send (inside g_access()), we can send 370 * event to detach and destroy consumer. 371 * A class, which has consumer to the given provider connected 372 * will not receive retaste event for the provider. 373 * This is the way how I ignore retaste events when I close 374 * consumers opened for write: I detach and destroy consumer 375 * after retaste event is sent. 376 */ 377 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 378 return; 379 } 380 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 381 g_detach(cp); 382 g_destroy_consumer(cp); 383 } 384 385 static int 386 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 387 { 388 struct g_consumer *cp; 389 int error; 390 391 g_topology_assert_not(); 392 KASSERT(disk->d_consumer == NULL, 393 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 394 395 g_topology_lock(); 396 cp = g_new_consumer(disk->d_softc->sc_geom); 397 error = g_attach(cp, pp); 398 if (error != 0) { 399 g_destroy_consumer(cp); 400 g_topology_unlock(); 401 return (error); 402 } 403 error = g_access(cp, 1, 1, 1); 404 if (error != 0) { 405 g_detach(cp); 406 g_destroy_consumer(cp); 407 g_topology_unlock(); 408 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 409 pp->name, error); 410 return (error); 411 } 412 g_topology_unlock(); 413 disk->d_consumer = cp; 414 disk->d_consumer->private = disk; 415 disk->d_consumer->index = 0; 416 417 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 418 return (0); 419 } 420 421 static void 422 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 423 { 424 425 g_topology_assert(); 426 427 if (cp == NULL) 428 return; 429 if (cp->provider != NULL) 430 g_mirror_kill_consumer(sc, cp); 431 else 432 g_destroy_consumer(cp); 433 } 434 435 /* 436 * Initialize disk. This means allocate memory, create consumer, attach it 437 * to the provider and open access (r1w1e1) to it. 438 */ 439 static struct g_mirror_disk * 440 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 441 struct g_mirror_metadata *md, int *errorp) 442 { 443 struct g_mirror_disk *disk; 444 int i, error; 445 446 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 447 if (disk == NULL) { 448 error = ENOMEM; 449 goto fail; 450 } 451 disk->d_softc = sc; 452 error = g_mirror_connect_disk(disk, pp); 453 if (error != 0) 454 goto fail; 455 disk->d_id = md->md_did; 456 disk->d_state = G_MIRROR_DISK_STATE_NONE; 457 disk->d_priority = md->md_priority; 458 disk->d_flags = md->md_dflags; 459 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 460 if (error == 0 && i != 0) 461 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 462 if (md->md_provider[0] != '\0') 463 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 464 disk->d_sync.ds_consumer = NULL; 465 disk->d_sync.ds_offset = md->md_sync_offset; 466 disk->d_sync.ds_offset_done = md->md_sync_offset; 467 disk->d_genid = md->md_genid; 468 disk->d_sync.ds_syncid = md->md_syncid; 469 if (errorp != NULL) 470 *errorp = 0; 471 return (disk); 472 fail: 473 if (errorp != NULL) 474 *errorp = error; 475 if (disk != NULL) 476 free(disk, M_MIRROR); 477 return (NULL); 478 } 479 480 static void 481 g_mirror_destroy_disk(struct g_mirror_disk *disk) 482 { 483 struct g_mirror_softc *sc; 484 485 g_topology_assert_not(); 486 sc = disk->d_softc; 487 sx_assert(&sc->sc_lock, SX_XLOCKED); 488 489 LIST_REMOVE(disk, d_next); 490 g_mirror_event_cancel(disk); 491 if (sc->sc_hint == disk) 492 sc->sc_hint = NULL; 493 switch (disk->d_state) { 494 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 495 g_mirror_sync_stop(disk, 1); 496 /* FALLTHROUGH */ 497 case G_MIRROR_DISK_STATE_NEW: 498 case G_MIRROR_DISK_STATE_STALE: 499 case G_MIRROR_DISK_STATE_ACTIVE: 500 g_topology_lock(); 501 g_mirror_disconnect_consumer(sc, disk->d_consumer); 502 g_topology_unlock(); 503 free(disk, M_MIRROR); 504 break; 505 default: 506 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 507 g_mirror_get_diskname(disk), 508 g_mirror_disk_state2str(disk->d_state))); 509 } 510 } 511 512 static void 513 g_mirror_destroy_device(struct g_mirror_softc *sc) 514 { 515 struct g_mirror_disk *disk; 516 struct g_mirror_event *ep; 517 struct g_geom *gp; 518 struct g_consumer *cp, *tmpcp; 519 520 g_topology_assert_not(); 521 sx_assert(&sc->sc_lock, SX_XLOCKED); 522 523 gp = sc->sc_geom; 524 if (sc->sc_provider != NULL) 525 g_mirror_destroy_provider(sc); 526 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 527 disk = LIST_FIRST(&sc->sc_disks)) { 528 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 529 g_mirror_update_metadata(disk); 530 g_mirror_destroy_disk(disk); 531 } 532 while ((ep = g_mirror_event_get(sc)) != NULL) { 533 g_mirror_event_remove(sc, ep); 534 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 535 g_mirror_event_free(ep); 536 else { 537 ep->e_error = ECANCELED; 538 ep->e_flags |= G_MIRROR_EVENT_DONE; 539 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 540 mtx_lock(&sc->sc_events_mtx); 541 wakeup(ep); 542 mtx_unlock(&sc->sc_events_mtx); 543 } 544 } 545 callout_drain(&sc->sc_callout); 546 547 g_topology_lock(); 548 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 549 g_mirror_disconnect_consumer(sc, cp); 550 } 551 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 552 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 553 g_wither_geom(gp, ENXIO); 554 g_topology_unlock(); 555 mtx_destroy(&sc->sc_queue_mtx); 556 mtx_destroy(&sc->sc_events_mtx); 557 sx_xunlock(&sc->sc_lock); 558 sx_destroy(&sc->sc_lock); 559 } 560 561 static void 562 g_mirror_orphan(struct g_consumer *cp) 563 { 564 struct g_mirror_disk *disk; 565 566 g_topology_assert(); 567 568 disk = cp->private; 569 if (disk == NULL) 570 return; 571 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 572 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 573 G_MIRROR_EVENT_DONTWAIT); 574 } 575 576 /* 577 * Function should return the next active disk on the list. 578 * It is possible that it will be the same disk as given. 579 * If there are no active disks on list, NULL is returned. 580 */ 581 static __inline struct g_mirror_disk * 582 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 583 { 584 struct g_mirror_disk *dp; 585 586 for (dp = LIST_NEXT(disk, d_next); dp != disk; 587 dp = LIST_NEXT(dp, d_next)) { 588 if (dp == NULL) 589 dp = LIST_FIRST(&sc->sc_disks); 590 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 591 break; 592 } 593 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 594 return (NULL); 595 return (dp); 596 } 597 598 static struct g_mirror_disk * 599 g_mirror_get_disk(struct g_mirror_softc *sc) 600 { 601 struct g_mirror_disk *disk; 602 603 if (sc->sc_hint == NULL) { 604 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 605 if (sc->sc_hint == NULL) 606 return (NULL); 607 } 608 disk = sc->sc_hint; 609 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 610 disk = g_mirror_find_next(sc, disk); 611 if (disk == NULL) 612 return (NULL); 613 } 614 sc->sc_hint = g_mirror_find_next(sc, disk); 615 return (disk); 616 } 617 618 static int 619 g_mirror_write_metadata(struct g_mirror_disk *disk, 620 struct g_mirror_metadata *md) 621 { 622 struct g_mirror_softc *sc; 623 struct g_consumer *cp; 624 off_t offset, length; 625 u_char *sector; 626 int error = 0; 627 628 g_topology_assert_not(); 629 sc = disk->d_softc; 630 sx_assert(&sc->sc_lock, SX_LOCKED); 631 632 cp = disk->d_consumer; 633 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 634 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 635 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 636 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 637 cp->acw, cp->ace)); 638 length = cp->provider->sectorsize; 639 offset = cp->provider->mediasize - length; 640 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 641 if (md != NULL) 642 mirror_metadata_encode(md, sector); 643 error = g_write_data(cp, offset, sector, length); 644 free(sector, M_MIRROR); 645 if (error != 0) { 646 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 647 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 648 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 649 "(device=%s, error=%d).", 650 g_mirror_get_diskname(disk), sc->sc_name, error); 651 } else { 652 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 653 "(device=%s, error=%d).", 654 g_mirror_get_diskname(disk), sc->sc_name, error); 655 } 656 if (g_mirror_disconnect_on_failure && 657 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 658 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 659 g_mirror_event_send(disk, 660 G_MIRROR_DISK_STATE_DISCONNECTED, 661 G_MIRROR_EVENT_DONTWAIT); 662 } 663 } 664 return (error); 665 } 666 667 static int 668 g_mirror_clear_metadata(struct g_mirror_disk *disk) 669 { 670 int error; 671 672 g_topology_assert_not(); 673 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 674 675 error = g_mirror_write_metadata(disk, NULL); 676 if (error == 0) { 677 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 678 g_mirror_get_diskname(disk)); 679 } else { 680 G_MIRROR_DEBUG(0, 681 "Cannot clear metadata on disk %s (error=%d).", 682 g_mirror_get_diskname(disk), error); 683 } 684 return (error); 685 } 686 687 void 688 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 689 struct g_mirror_metadata *md) 690 { 691 692 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 693 md->md_version = G_MIRROR_VERSION; 694 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 695 md->md_mid = sc->sc_id; 696 md->md_all = sc->sc_ndisks; 697 md->md_slice = sc->sc_slice; 698 md->md_balance = sc->sc_balance; 699 md->md_genid = sc->sc_genid; 700 md->md_mediasize = sc->sc_mediasize; 701 md->md_sectorsize = sc->sc_sectorsize; 702 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 703 bzero(md->md_provider, sizeof(md->md_provider)); 704 if (disk == NULL) { 705 md->md_did = arc4random(); 706 md->md_priority = 0; 707 md->md_syncid = 0; 708 md->md_dflags = 0; 709 md->md_sync_offset = 0; 710 md->md_provsize = 0; 711 } else { 712 md->md_did = disk->d_id; 713 md->md_priority = disk->d_priority; 714 md->md_syncid = disk->d_sync.ds_syncid; 715 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 716 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 717 md->md_sync_offset = disk->d_sync.ds_offset_done; 718 else 719 md->md_sync_offset = 0; 720 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 721 strlcpy(md->md_provider, 722 disk->d_consumer->provider->name, 723 sizeof(md->md_provider)); 724 } 725 md->md_provsize = disk->d_consumer->provider->mediasize; 726 } 727 } 728 729 void 730 g_mirror_update_metadata(struct g_mirror_disk *disk) 731 { 732 struct g_mirror_softc *sc; 733 struct g_mirror_metadata md; 734 int error; 735 736 g_topology_assert_not(); 737 sc = disk->d_softc; 738 sx_assert(&sc->sc_lock, SX_LOCKED); 739 740 g_mirror_fill_metadata(sc, disk, &md); 741 error = g_mirror_write_metadata(disk, &md); 742 if (error == 0) { 743 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 744 g_mirror_get_diskname(disk)); 745 } else { 746 G_MIRROR_DEBUG(0, 747 "Cannot update metadata on disk %s (error=%d).", 748 g_mirror_get_diskname(disk), error); 749 } 750 } 751 752 static void 753 g_mirror_bump_syncid(struct g_mirror_softc *sc) 754 { 755 struct g_mirror_disk *disk; 756 757 g_topology_assert_not(); 758 sx_assert(&sc->sc_lock, SX_XLOCKED); 759 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 760 ("%s called with no active disks (device=%s).", __func__, 761 sc->sc_name)); 762 763 sc->sc_syncid++; 764 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 765 sc->sc_syncid); 766 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 767 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 768 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 769 disk->d_sync.ds_syncid = sc->sc_syncid; 770 g_mirror_update_metadata(disk); 771 } 772 } 773 } 774 775 static void 776 g_mirror_bump_genid(struct g_mirror_softc *sc) 777 { 778 struct g_mirror_disk *disk; 779 780 g_topology_assert_not(); 781 sx_assert(&sc->sc_lock, SX_XLOCKED); 782 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 783 ("%s called with no active disks (device=%s).", __func__, 784 sc->sc_name)); 785 786 sc->sc_genid++; 787 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 788 sc->sc_genid); 789 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 790 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 791 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 792 disk->d_genid = sc->sc_genid; 793 g_mirror_update_metadata(disk); 794 } 795 } 796 } 797 798 static int 799 g_mirror_idle(struct g_mirror_softc *sc, int acw) 800 { 801 struct g_mirror_disk *disk; 802 int timeout; 803 804 g_topology_assert_not(); 805 sx_assert(&sc->sc_lock, SX_XLOCKED); 806 807 if (sc->sc_provider == NULL) 808 return (0); 809 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 810 return (0); 811 if (sc->sc_idle) 812 return (0); 813 if (sc->sc_writes > 0) 814 return (0); 815 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 816 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 817 if (!g_mirror_shutdown && timeout > 0) 818 return (timeout); 819 } 820 sc->sc_idle = 1; 821 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 822 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 823 continue; 824 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 825 g_mirror_get_diskname(disk), sc->sc_name); 826 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 827 g_mirror_update_metadata(disk); 828 } 829 return (0); 830 } 831 832 static void 833 g_mirror_unidle(struct g_mirror_softc *sc) 834 { 835 struct g_mirror_disk *disk; 836 837 g_topology_assert_not(); 838 sx_assert(&sc->sc_lock, SX_XLOCKED); 839 840 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 841 return; 842 sc->sc_idle = 0; 843 sc->sc_last_write = time_uptime; 844 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 845 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 846 continue; 847 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 848 g_mirror_get_diskname(disk), sc->sc_name); 849 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 850 g_mirror_update_metadata(disk); 851 } 852 } 853 854 static void 855 g_mirror_done(struct bio *bp) 856 { 857 struct g_mirror_softc *sc; 858 859 sc = bp->bio_from->geom->softc; 860 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 861 mtx_lock(&sc->sc_queue_mtx); 862 bioq_disksort(&sc->sc_queue, bp); 863 mtx_unlock(&sc->sc_queue_mtx); 864 wakeup(sc); 865 } 866 867 static void 868 g_mirror_regular_request(struct bio *bp) 869 { 870 struct g_mirror_softc *sc; 871 struct g_mirror_disk *disk; 872 struct bio *pbp; 873 874 g_topology_assert_not(); 875 876 pbp = bp->bio_parent; 877 sc = pbp->bio_to->geom->softc; 878 bp->bio_from->index--; 879 if (bp->bio_cmd == BIO_WRITE) 880 sc->sc_writes--; 881 disk = bp->bio_from->private; 882 if (disk == NULL) { 883 g_topology_lock(); 884 g_mirror_kill_consumer(sc, bp->bio_from); 885 g_topology_unlock(); 886 } 887 888 pbp->bio_inbed++; 889 KASSERT(pbp->bio_inbed <= pbp->bio_children, 890 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 891 pbp->bio_children)); 892 if (bp->bio_error == 0 && pbp->bio_error == 0) { 893 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 894 g_destroy_bio(bp); 895 if (pbp->bio_children == pbp->bio_inbed) { 896 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 897 pbp->bio_completed = pbp->bio_length; 898 if (pbp->bio_cmd == BIO_WRITE || 899 pbp->bio_cmd == BIO_DELETE) { 900 bioq_remove(&sc->sc_inflight, pbp); 901 /* Release delayed sync requests if possible. */ 902 g_mirror_sync_release(sc); 903 } 904 g_io_deliver(pbp, pbp->bio_error); 905 } 906 return; 907 } else if (bp->bio_error != 0) { 908 if (pbp->bio_error == 0) 909 pbp->bio_error = bp->bio_error; 910 if (disk != NULL) { 911 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 912 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 913 G_MIRROR_LOGREQ(0, bp, 914 "Request failed (error=%d).", 915 bp->bio_error); 916 } else { 917 G_MIRROR_LOGREQ(1, bp, 918 "Request failed (error=%d).", 919 bp->bio_error); 920 } 921 if (g_mirror_disconnect_on_failure && 922 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 923 { 924 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 925 g_mirror_event_send(disk, 926 G_MIRROR_DISK_STATE_DISCONNECTED, 927 G_MIRROR_EVENT_DONTWAIT); 928 } 929 } 930 switch (pbp->bio_cmd) { 931 case BIO_DELETE: 932 case BIO_WRITE: 933 pbp->bio_inbed--; 934 pbp->bio_children--; 935 break; 936 } 937 } 938 g_destroy_bio(bp); 939 940 switch (pbp->bio_cmd) { 941 case BIO_READ: 942 if (pbp->bio_inbed < pbp->bio_children) 943 break; 944 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 945 g_io_deliver(pbp, pbp->bio_error); 946 else { 947 pbp->bio_error = 0; 948 mtx_lock(&sc->sc_queue_mtx); 949 bioq_disksort(&sc->sc_queue, pbp); 950 mtx_unlock(&sc->sc_queue_mtx); 951 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 952 wakeup(sc); 953 } 954 break; 955 case BIO_DELETE: 956 case BIO_WRITE: 957 if (pbp->bio_children == 0) { 958 /* 959 * All requests failed. 960 */ 961 } else if (pbp->bio_inbed < pbp->bio_children) { 962 /* Do nothing. */ 963 break; 964 } else if (pbp->bio_children == pbp->bio_inbed) { 965 /* Some requests succeeded. */ 966 pbp->bio_error = 0; 967 pbp->bio_completed = pbp->bio_length; 968 } 969 bioq_remove(&sc->sc_inflight, pbp); 970 /* Release delayed sync requests if possible. */ 971 g_mirror_sync_release(sc); 972 g_io_deliver(pbp, pbp->bio_error); 973 break; 974 default: 975 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 976 break; 977 } 978 } 979 980 static void 981 g_mirror_sync_done(struct bio *bp) 982 { 983 struct g_mirror_softc *sc; 984 985 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 986 sc = bp->bio_from->geom->softc; 987 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 988 mtx_lock(&sc->sc_queue_mtx); 989 bioq_disksort(&sc->sc_queue, bp); 990 mtx_unlock(&sc->sc_queue_mtx); 991 wakeup(sc); 992 } 993 994 static void 995 g_mirror_kernel_dump(struct bio *bp) 996 { 997 struct g_mirror_softc *sc; 998 struct g_mirror_disk *disk; 999 struct bio *cbp; 1000 struct g_kerneldump *gkd; 1001 1002 /* 1003 * We configure dumping to the first component, because this component 1004 * will be used for reading with 'prefer' balance algorithm. 1005 * If the component with the higest priority is currently disconnected 1006 * we will not be able to read the dump after the reboot if it will be 1007 * connected and synchronized later. Can we do something better? 1008 */ 1009 sc = bp->bio_to->geom->softc; 1010 disk = LIST_FIRST(&sc->sc_disks); 1011 1012 gkd = (struct g_kerneldump *)bp->bio_data; 1013 if (gkd->length > bp->bio_to->mediasize) 1014 gkd->length = bp->bio_to->mediasize; 1015 cbp = g_clone_bio(bp); 1016 if (cbp == NULL) { 1017 g_io_deliver(bp, ENOMEM); 1018 return; 1019 } 1020 cbp->bio_done = g_std_done; 1021 g_io_request(cbp, disk->d_consumer); 1022 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1023 g_mirror_get_diskname(disk)); 1024 } 1025 1026 static void 1027 g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1028 { 1029 struct bio_queue_head queue; 1030 struct g_mirror_disk *disk; 1031 struct g_consumer *cp; 1032 struct bio *cbp; 1033 1034 bioq_init(&queue); 1035 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1036 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1037 continue; 1038 cbp = g_clone_bio(bp); 1039 if (cbp == NULL) { 1040 for (cbp = bioq_first(&queue); cbp != NULL; 1041 cbp = bioq_first(&queue)) { 1042 bioq_remove(&queue, cbp); 1043 g_destroy_bio(cbp); 1044 } 1045 if (bp->bio_error == 0) 1046 bp->bio_error = ENOMEM; 1047 g_io_deliver(bp, bp->bio_error); 1048 return; 1049 } 1050 bioq_insert_tail(&queue, cbp); 1051 cbp->bio_done = g_std_done; 1052 cbp->bio_caller1 = disk; 1053 cbp->bio_to = disk->d_consumer->provider; 1054 } 1055 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1056 bioq_remove(&queue, cbp); 1057 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1058 disk = cbp->bio_caller1; 1059 cbp->bio_caller1 = NULL; 1060 cp = disk->d_consumer; 1061 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1062 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1063 cp->acr, cp->acw, cp->ace)); 1064 g_io_request(cbp, disk->d_consumer); 1065 } 1066 } 1067 1068 static void 1069 g_mirror_start(struct bio *bp) 1070 { 1071 struct g_mirror_softc *sc; 1072 1073 sc = bp->bio_to->geom->softc; 1074 /* 1075 * If sc == NULL or there are no valid disks, provider's error 1076 * should be set and g_mirror_start() should not be called at all. 1077 */ 1078 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1079 ("Provider's error should be set (error=%d)(mirror=%s).", 1080 bp->bio_to->error, bp->bio_to->name)); 1081 G_MIRROR_LOGREQ(3, bp, "Request received."); 1082 1083 switch (bp->bio_cmd) { 1084 case BIO_READ: 1085 case BIO_WRITE: 1086 case BIO_DELETE: 1087 break; 1088 case BIO_FLUSH: 1089 g_mirror_flush(sc, bp); 1090 return; 1091 case BIO_GETATTR: 1092 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 1093 return; 1094 else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1095 g_mirror_kernel_dump(bp); 1096 return; 1097 } 1098 /* FALLTHROUGH */ 1099 default: 1100 g_io_deliver(bp, EOPNOTSUPP); 1101 return; 1102 } 1103 mtx_lock(&sc->sc_queue_mtx); 1104 bioq_disksort(&sc->sc_queue, bp); 1105 mtx_unlock(&sc->sc_queue_mtx); 1106 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1107 wakeup(sc); 1108 } 1109 1110 /* 1111 * Return TRUE if the given request is colliding with a in-progress 1112 * synchronization request. 1113 */ 1114 static int 1115 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1116 { 1117 struct g_mirror_disk *disk; 1118 struct bio *sbp; 1119 off_t rstart, rend, sstart, send; 1120 int i; 1121 1122 if (sc->sc_sync.ds_ndisks == 0) 1123 return (0); 1124 rstart = bp->bio_offset; 1125 rend = bp->bio_offset + bp->bio_length; 1126 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1127 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1128 continue; 1129 for (i = 0; i < g_mirror_syncreqs; i++) { 1130 sbp = disk->d_sync.ds_bios[i]; 1131 if (sbp == NULL) 1132 continue; 1133 sstart = sbp->bio_offset; 1134 send = sbp->bio_offset + sbp->bio_length; 1135 if (rend > sstart && rstart < send) 1136 return (1); 1137 } 1138 } 1139 return (0); 1140 } 1141 1142 /* 1143 * Return TRUE if the given sync request is colliding with a in-progress regular 1144 * request. 1145 */ 1146 static int 1147 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1148 { 1149 off_t rstart, rend, sstart, send; 1150 struct bio *bp; 1151 1152 if (sc->sc_sync.ds_ndisks == 0) 1153 return (0); 1154 sstart = sbp->bio_offset; 1155 send = sbp->bio_offset + sbp->bio_length; 1156 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1157 rstart = bp->bio_offset; 1158 rend = bp->bio_offset + bp->bio_length; 1159 if (rend > sstart && rstart < send) 1160 return (1); 1161 } 1162 return (0); 1163 } 1164 1165 /* 1166 * Puts request onto delayed queue. 1167 */ 1168 static void 1169 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1170 { 1171 1172 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1173 bioq_insert_head(&sc->sc_regular_delayed, bp); 1174 } 1175 1176 /* 1177 * Puts synchronization request onto delayed queue. 1178 */ 1179 static void 1180 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1181 { 1182 1183 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1184 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1185 } 1186 1187 /* 1188 * Releases delayed regular requests which don't collide anymore with sync 1189 * requests. 1190 */ 1191 static void 1192 g_mirror_regular_release(struct g_mirror_softc *sc) 1193 { 1194 struct bio *bp, *bp2; 1195 1196 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1197 if (g_mirror_sync_collision(sc, bp)) 1198 continue; 1199 bioq_remove(&sc->sc_regular_delayed, bp); 1200 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1201 mtx_lock(&sc->sc_queue_mtx); 1202 bioq_insert_head(&sc->sc_queue, bp); 1203 #if 0 1204 /* 1205 * wakeup() is not needed, because this function is called from 1206 * the worker thread. 1207 */ 1208 wakeup(&sc->sc_queue); 1209 #endif 1210 mtx_unlock(&sc->sc_queue_mtx); 1211 } 1212 } 1213 1214 /* 1215 * Releases delayed sync requests which don't collide anymore with regular 1216 * requests. 1217 */ 1218 static void 1219 g_mirror_sync_release(struct g_mirror_softc *sc) 1220 { 1221 struct bio *bp, *bp2; 1222 1223 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1224 if (g_mirror_regular_collision(sc, bp)) 1225 continue; 1226 bioq_remove(&sc->sc_sync_delayed, bp); 1227 G_MIRROR_LOGREQ(2, bp, 1228 "Releasing delayed synchronization request."); 1229 g_io_request(bp, bp->bio_from); 1230 } 1231 } 1232 1233 /* 1234 * Handle synchronization requests. 1235 * Every synchronization request is two-steps process: first, READ request is 1236 * send to active provider and then WRITE request (with read data) to the provider 1237 * beeing synchronized. When WRITE is finished, new synchronization request is 1238 * send. 1239 */ 1240 static void 1241 g_mirror_sync_request(struct bio *bp) 1242 { 1243 struct g_mirror_softc *sc; 1244 struct g_mirror_disk *disk; 1245 1246 bp->bio_from->index--; 1247 sc = bp->bio_from->geom->softc; 1248 disk = bp->bio_from->private; 1249 if (disk == NULL) { 1250 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1251 g_topology_lock(); 1252 g_mirror_kill_consumer(sc, bp->bio_from); 1253 g_topology_unlock(); 1254 free(bp->bio_data, M_MIRROR); 1255 g_destroy_bio(bp); 1256 sx_xlock(&sc->sc_lock); 1257 return; 1258 } 1259 1260 /* 1261 * Synchronization request. 1262 */ 1263 switch (bp->bio_cmd) { 1264 case BIO_READ: 1265 { 1266 struct g_consumer *cp; 1267 1268 if (bp->bio_error != 0) { 1269 G_MIRROR_LOGREQ(0, bp, 1270 "Synchronization request failed (error=%d).", 1271 bp->bio_error); 1272 g_destroy_bio(bp); 1273 return; 1274 } 1275 G_MIRROR_LOGREQ(3, bp, 1276 "Synchronization request half-finished."); 1277 bp->bio_cmd = BIO_WRITE; 1278 bp->bio_cflags = 0; 1279 cp = disk->d_consumer; 1280 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1281 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1282 cp->acr, cp->acw, cp->ace)); 1283 cp->index++; 1284 g_io_request(bp, cp); 1285 return; 1286 } 1287 case BIO_WRITE: 1288 { 1289 struct g_mirror_disk_sync *sync; 1290 off_t offset; 1291 void *data; 1292 int i; 1293 1294 if (bp->bio_error != 0) { 1295 G_MIRROR_LOGREQ(0, bp, 1296 "Synchronization request failed (error=%d).", 1297 bp->bio_error); 1298 g_destroy_bio(bp); 1299 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1300 g_mirror_event_send(disk, 1301 G_MIRROR_DISK_STATE_DISCONNECTED, 1302 G_MIRROR_EVENT_DONTWAIT); 1303 return; 1304 } 1305 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1306 sync = &disk->d_sync; 1307 if (sync->ds_offset == sc->sc_mediasize || 1308 sync->ds_consumer == NULL || 1309 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1310 /* Don't send more synchronization requests. */ 1311 sync->ds_inflight--; 1312 if (sync->ds_bios != NULL) { 1313 i = (int)(uintptr_t)bp->bio_caller1; 1314 sync->ds_bios[i] = NULL; 1315 } 1316 free(bp->bio_data, M_MIRROR); 1317 g_destroy_bio(bp); 1318 if (sync->ds_inflight > 0) 1319 return; 1320 if (sync->ds_consumer == NULL || 1321 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1322 return; 1323 } 1324 /* Disk up-to-date, activate it. */ 1325 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1326 G_MIRROR_EVENT_DONTWAIT); 1327 return; 1328 } 1329 1330 /* Send next synchronization request. */ 1331 data = bp->bio_data; 1332 bzero(bp, sizeof(*bp)); 1333 bp->bio_cmd = BIO_READ; 1334 bp->bio_offset = sync->ds_offset; 1335 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1336 sync->ds_offset += bp->bio_length; 1337 bp->bio_done = g_mirror_sync_done; 1338 bp->bio_data = data; 1339 bp->bio_from = sync->ds_consumer; 1340 bp->bio_to = sc->sc_provider; 1341 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1342 sync->ds_consumer->index++; 1343 /* 1344 * Delay the request if it is colliding with a regular request. 1345 */ 1346 if (g_mirror_regular_collision(sc, bp)) 1347 g_mirror_sync_delay(sc, bp); 1348 else 1349 g_io_request(bp, sync->ds_consumer); 1350 1351 /* Release delayed requests if possible. */ 1352 g_mirror_regular_release(sc); 1353 1354 /* Find the smallest offset */ 1355 offset = sc->sc_mediasize; 1356 for (i = 0; i < g_mirror_syncreqs; i++) { 1357 bp = sync->ds_bios[i]; 1358 if (bp->bio_offset < offset) 1359 offset = bp->bio_offset; 1360 } 1361 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1362 /* Update offset_done on every 100 blocks. */ 1363 sync->ds_offset_done = offset; 1364 g_mirror_update_metadata(disk); 1365 } 1366 return; 1367 } 1368 default: 1369 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1370 bp->bio_cmd, sc->sc_name)); 1371 break; 1372 } 1373 } 1374 1375 static void 1376 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1377 { 1378 struct g_mirror_disk *disk; 1379 struct g_consumer *cp; 1380 struct bio *cbp; 1381 1382 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1383 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1384 break; 1385 } 1386 if (disk == NULL) { 1387 if (bp->bio_error == 0) 1388 bp->bio_error = ENXIO; 1389 g_io_deliver(bp, bp->bio_error); 1390 return; 1391 } 1392 cbp = g_clone_bio(bp); 1393 if (cbp == NULL) { 1394 if (bp->bio_error == 0) 1395 bp->bio_error = ENOMEM; 1396 g_io_deliver(bp, bp->bio_error); 1397 return; 1398 } 1399 /* 1400 * Fill in the component buf structure. 1401 */ 1402 cp = disk->d_consumer; 1403 cbp->bio_done = g_mirror_done; 1404 cbp->bio_to = cp->provider; 1405 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1406 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1407 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1408 cp->acw, cp->ace)); 1409 cp->index++; 1410 g_io_request(cbp, cp); 1411 } 1412 1413 static void 1414 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1415 { 1416 struct g_mirror_disk *disk; 1417 struct g_consumer *cp; 1418 struct bio *cbp; 1419 1420 disk = g_mirror_get_disk(sc); 1421 if (disk == NULL) { 1422 if (bp->bio_error == 0) 1423 bp->bio_error = ENXIO; 1424 g_io_deliver(bp, bp->bio_error); 1425 return; 1426 } 1427 cbp = g_clone_bio(bp); 1428 if (cbp == NULL) { 1429 if (bp->bio_error == 0) 1430 bp->bio_error = ENOMEM; 1431 g_io_deliver(bp, bp->bio_error); 1432 return; 1433 } 1434 /* 1435 * Fill in the component buf structure. 1436 */ 1437 cp = disk->d_consumer; 1438 cbp->bio_done = g_mirror_done; 1439 cbp->bio_to = cp->provider; 1440 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1441 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1442 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1443 cp->acw, cp->ace)); 1444 cp->index++; 1445 g_io_request(cbp, cp); 1446 } 1447 1448 #define TRACK_SIZE (1 * 1024 * 1024) 1449 #define LOAD_SCALE 256 1450 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1451 1452 static void 1453 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1454 { 1455 struct g_mirror_disk *disk, *dp; 1456 struct g_consumer *cp; 1457 struct bio *cbp; 1458 int prio, best; 1459 1460 /* Find a disk with the smallest load. */ 1461 disk = NULL; 1462 best = INT_MAX; 1463 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1464 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1465 continue; 1466 prio = dp->load; 1467 /* If disk head is precisely in position - highly prefer it. */ 1468 if (dp->d_last_offset == bp->bio_offset) 1469 prio -= 2 * LOAD_SCALE; 1470 else 1471 /* If disk head is close to position - prefer it. */ 1472 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1473 prio -= 1 * LOAD_SCALE; 1474 if (prio <= best) { 1475 disk = dp; 1476 best = prio; 1477 } 1478 } 1479 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1480 cbp = g_clone_bio(bp); 1481 if (cbp == NULL) { 1482 if (bp->bio_error == 0) 1483 bp->bio_error = ENOMEM; 1484 g_io_deliver(bp, bp->bio_error); 1485 return; 1486 } 1487 /* 1488 * Fill in the component buf structure. 1489 */ 1490 cp = disk->d_consumer; 1491 cbp->bio_done = g_mirror_done; 1492 cbp->bio_to = cp->provider; 1493 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1494 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1495 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1496 cp->acw, cp->ace)); 1497 cp->index++; 1498 /* Remember last head position */ 1499 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1500 /* Update loads. */ 1501 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1502 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1503 dp->load * 7) / 8; 1504 } 1505 g_io_request(cbp, cp); 1506 } 1507 1508 static void 1509 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1510 { 1511 struct bio_queue_head queue; 1512 struct g_mirror_disk *disk; 1513 struct g_consumer *cp; 1514 struct bio *cbp; 1515 off_t left, mod, offset, slice; 1516 u_char *data; 1517 u_int ndisks; 1518 1519 if (bp->bio_length <= sc->sc_slice) { 1520 g_mirror_request_round_robin(sc, bp); 1521 return; 1522 } 1523 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1524 slice = bp->bio_length / ndisks; 1525 mod = slice % sc->sc_provider->sectorsize; 1526 if (mod != 0) 1527 slice += sc->sc_provider->sectorsize - mod; 1528 /* 1529 * Allocate all bios before sending any request, so we can 1530 * return ENOMEM in nice and clean way. 1531 */ 1532 left = bp->bio_length; 1533 offset = bp->bio_offset; 1534 data = bp->bio_data; 1535 bioq_init(&queue); 1536 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1537 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1538 continue; 1539 cbp = g_clone_bio(bp); 1540 if (cbp == NULL) { 1541 for (cbp = bioq_first(&queue); cbp != NULL; 1542 cbp = bioq_first(&queue)) { 1543 bioq_remove(&queue, cbp); 1544 g_destroy_bio(cbp); 1545 } 1546 if (bp->bio_error == 0) 1547 bp->bio_error = ENOMEM; 1548 g_io_deliver(bp, bp->bio_error); 1549 return; 1550 } 1551 bioq_insert_tail(&queue, cbp); 1552 cbp->bio_done = g_mirror_done; 1553 cbp->bio_caller1 = disk; 1554 cbp->bio_to = disk->d_consumer->provider; 1555 cbp->bio_offset = offset; 1556 cbp->bio_data = data; 1557 cbp->bio_length = MIN(left, slice); 1558 left -= cbp->bio_length; 1559 if (left == 0) 1560 break; 1561 offset += cbp->bio_length; 1562 data += cbp->bio_length; 1563 } 1564 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) { 1565 bioq_remove(&queue, cbp); 1566 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1567 disk = cbp->bio_caller1; 1568 cbp->bio_caller1 = NULL; 1569 cp = disk->d_consumer; 1570 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1571 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1572 cp->acr, cp->acw, cp->ace)); 1573 disk->d_consumer->index++; 1574 g_io_request(cbp, disk->d_consumer); 1575 } 1576 } 1577 1578 static void 1579 g_mirror_register_request(struct bio *bp) 1580 { 1581 struct g_mirror_softc *sc; 1582 1583 sc = bp->bio_to->geom->softc; 1584 switch (bp->bio_cmd) { 1585 case BIO_READ: 1586 switch (sc->sc_balance) { 1587 case G_MIRROR_BALANCE_LOAD: 1588 g_mirror_request_load(sc, bp); 1589 break; 1590 case G_MIRROR_BALANCE_PREFER: 1591 g_mirror_request_prefer(sc, bp); 1592 break; 1593 case G_MIRROR_BALANCE_ROUND_ROBIN: 1594 g_mirror_request_round_robin(sc, bp); 1595 break; 1596 case G_MIRROR_BALANCE_SPLIT: 1597 g_mirror_request_split(sc, bp); 1598 break; 1599 } 1600 return; 1601 case BIO_WRITE: 1602 case BIO_DELETE: 1603 { 1604 struct g_mirror_disk *disk; 1605 struct g_mirror_disk_sync *sync; 1606 struct bio_queue_head queue; 1607 struct g_consumer *cp; 1608 struct bio *cbp; 1609 1610 /* 1611 * Delay the request if it is colliding with a synchronization 1612 * request. 1613 */ 1614 if (g_mirror_sync_collision(sc, bp)) { 1615 g_mirror_regular_delay(sc, bp); 1616 return; 1617 } 1618 1619 if (sc->sc_idle) 1620 g_mirror_unidle(sc); 1621 else 1622 sc->sc_last_write = time_uptime; 1623 1624 /* 1625 * Allocate all bios before sending any request, so we can 1626 * return ENOMEM in nice and clean way. 1627 */ 1628 bioq_init(&queue); 1629 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1630 sync = &disk->d_sync; 1631 switch (disk->d_state) { 1632 case G_MIRROR_DISK_STATE_ACTIVE: 1633 break; 1634 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1635 if (bp->bio_offset >= sync->ds_offset) 1636 continue; 1637 break; 1638 default: 1639 continue; 1640 } 1641 if (bp->bio_cmd == BIO_DELETE && 1642 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1643 continue; 1644 cbp = g_clone_bio(bp); 1645 if (cbp == NULL) { 1646 for (cbp = bioq_first(&queue); cbp != NULL; 1647 cbp = bioq_first(&queue)) { 1648 bioq_remove(&queue, cbp); 1649 g_destroy_bio(cbp); 1650 } 1651 if (bp->bio_error == 0) 1652 bp->bio_error = ENOMEM; 1653 g_io_deliver(bp, bp->bio_error); 1654 return; 1655 } 1656 bioq_insert_tail(&queue, cbp); 1657 cbp->bio_done = g_mirror_done; 1658 cp = disk->d_consumer; 1659 cbp->bio_caller1 = cp; 1660 cbp->bio_to = cp->provider; 1661 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1662 ("Consumer %s not opened (r%dw%de%d).", 1663 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1664 } 1665 for (cbp = bioq_first(&queue); cbp != NULL; 1666 cbp = bioq_first(&queue)) { 1667 bioq_remove(&queue, cbp); 1668 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1669 cp = cbp->bio_caller1; 1670 cbp->bio_caller1 = NULL; 1671 cp->index++; 1672 sc->sc_writes++; 1673 g_io_request(cbp, cp); 1674 } 1675 /* 1676 * Put request onto inflight queue, so we can check if new 1677 * synchronization requests don't collide with it. 1678 */ 1679 bioq_insert_tail(&sc->sc_inflight, bp); 1680 /* 1681 * Bump syncid on first write. 1682 */ 1683 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1684 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1685 g_mirror_bump_syncid(sc); 1686 } 1687 return; 1688 } 1689 default: 1690 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1691 bp->bio_cmd, sc->sc_name)); 1692 break; 1693 } 1694 } 1695 1696 static int 1697 g_mirror_can_destroy(struct g_mirror_softc *sc) 1698 { 1699 struct g_geom *gp; 1700 struct g_consumer *cp; 1701 1702 g_topology_assert(); 1703 gp = sc->sc_geom; 1704 if (gp->softc == NULL) 1705 return (1); 1706 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1707 return (0); 1708 LIST_FOREACH(cp, &gp->consumer, consumer) { 1709 if (g_mirror_is_busy(sc, cp)) 1710 return (0); 1711 } 1712 gp = sc->sc_sync.ds_geom; 1713 LIST_FOREACH(cp, &gp->consumer, consumer) { 1714 if (g_mirror_is_busy(sc, cp)) 1715 return (0); 1716 } 1717 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1718 sc->sc_name); 1719 return (1); 1720 } 1721 1722 static int 1723 g_mirror_try_destroy(struct g_mirror_softc *sc) 1724 { 1725 1726 if (sc->sc_rootmount != NULL) { 1727 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1728 sc->sc_rootmount); 1729 root_mount_rel(sc->sc_rootmount); 1730 sc->sc_rootmount = NULL; 1731 } 1732 g_topology_lock(); 1733 if (!g_mirror_can_destroy(sc)) { 1734 g_topology_unlock(); 1735 return (0); 1736 } 1737 sc->sc_geom->softc = NULL; 1738 sc->sc_sync.ds_geom->softc = NULL; 1739 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1740 g_topology_unlock(); 1741 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1742 &sc->sc_worker); 1743 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1744 sx_xunlock(&sc->sc_lock); 1745 wakeup(&sc->sc_worker); 1746 sc->sc_worker = NULL; 1747 } else { 1748 g_topology_unlock(); 1749 g_mirror_destroy_device(sc); 1750 free(sc, M_MIRROR); 1751 } 1752 return (1); 1753 } 1754 1755 /* 1756 * Worker thread. 1757 */ 1758 static void 1759 g_mirror_worker(void *arg) 1760 { 1761 struct g_mirror_softc *sc; 1762 struct g_mirror_event *ep; 1763 struct bio *bp; 1764 int timeout; 1765 1766 sc = arg; 1767 thread_lock(curthread); 1768 sched_prio(curthread, PRIBIO); 1769 thread_unlock(curthread); 1770 1771 sx_xlock(&sc->sc_lock); 1772 for (;;) { 1773 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1774 /* 1775 * First take a look at events. 1776 * This is important to handle events before any I/O requests. 1777 */ 1778 ep = g_mirror_event_get(sc); 1779 if (ep != NULL) { 1780 g_mirror_event_remove(sc, ep); 1781 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1782 /* Update only device status. */ 1783 G_MIRROR_DEBUG(3, 1784 "Running event for device %s.", 1785 sc->sc_name); 1786 ep->e_error = 0; 1787 g_mirror_update_device(sc, 1); 1788 } else { 1789 /* Update disk status. */ 1790 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1791 g_mirror_get_diskname(ep->e_disk)); 1792 ep->e_error = g_mirror_update_disk(ep->e_disk, 1793 ep->e_state); 1794 if (ep->e_error == 0) 1795 g_mirror_update_device(sc, 0); 1796 } 1797 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1798 KASSERT(ep->e_error == 0, 1799 ("Error cannot be handled.")); 1800 g_mirror_event_free(ep); 1801 } else { 1802 ep->e_flags |= G_MIRROR_EVENT_DONE; 1803 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1804 ep); 1805 mtx_lock(&sc->sc_events_mtx); 1806 wakeup(ep); 1807 mtx_unlock(&sc->sc_events_mtx); 1808 } 1809 if ((sc->sc_flags & 1810 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1811 if (g_mirror_try_destroy(sc)) { 1812 curthread->td_pflags &= ~TDP_GEOM; 1813 G_MIRROR_DEBUG(1, "Thread exiting."); 1814 kproc_exit(0); 1815 } 1816 } 1817 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1818 continue; 1819 } 1820 /* 1821 * Check if we can mark array as CLEAN and if we can't take 1822 * how much seconds should we wait. 1823 */ 1824 timeout = g_mirror_idle(sc, -1); 1825 /* 1826 * Now I/O requests. 1827 */ 1828 /* Get first request from the queue. */ 1829 mtx_lock(&sc->sc_queue_mtx); 1830 bp = bioq_first(&sc->sc_queue); 1831 if (bp == NULL) { 1832 if ((sc->sc_flags & 1833 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1834 mtx_unlock(&sc->sc_queue_mtx); 1835 if (g_mirror_try_destroy(sc)) { 1836 curthread->td_pflags &= ~TDP_GEOM; 1837 G_MIRROR_DEBUG(1, "Thread exiting."); 1838 kproc_exit(0); 1839 } 1840 mtx_lock(&sc->sc_queue_mtx); 1841 } 1842 sx_xunlock(&sc->sc_lock); 1843 /* 1844 * XXX: We can miss an event here, because an event 1845 * can be added without sx-device-lock and without 1846 * mtx-queue-lock. Maybe I should just stop using 1847 * dedicated mutex for events synchronization and 1848 * stick with the queue lock? 1849 * The event will hang here until next I/O request 1850 * or next event is received. 1851 */ 1852 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1853 timeout * hz); 1854 sx_xlock(&sc->sc_lock); 1855 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1856 continue; 1857 } 1858 bioq_remove(&sc->sc_queue, bp); 1859 mtx_unlock(&sc->sc_queue_mtx); 1860 1861 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1862 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1863 g_mirror_sync_request(bp); /* READ */ 1864 } else if (bp->bio_to != sc->sc_provider) { 1865 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1866 g_mirror_regular_request(bp); 1867 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1868 g_mirror_sync_request(bp); /* WRITE */ 1869 else { 1870 KASSERT(0, 1871 ("Invalid request cflags=0x%hhx to=%s.", 1872 bp->bio_cflags, bp->bio_to->name)); 1873 } 1874 } else { 1875 g_mirror_register_request(bp); 1876 } 1877 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1878 } 1879 } 1880 1881 static void 1882 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1883 { 1884 1885 sx_assert(&sc->sc_lock, SX_LOCKED); 1886 1887 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1888 return; 1889 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1890 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1891 g_mirror_get_diskname(disk), sc->sc_name); 1892 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1893 } else if (sc->sc_idle && 1894 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1895 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1896 g_mirror_get_diskname(disk), sc->sc_name); 1897 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1898 } 1899 } 1900 1901 static void 1902 g_mirror_sync_start(struct g_mirror_disk *disk) 1903 { 1904 struct g_mirror_softc *sc; 1905 struct g_consumer *cp; 1906 struct bio *bp; 1907 int error, i; 1908 1909 g_topology_assert_not(); 1910 sc = disk->d_softc; 1911 sx_assert(&sc->sc_lock, SX_LOCKED); 1912 1913 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1914 ("Disk %s is not marked for synchronization.", 1915 g_mirror_get_diskname(disk))); 1916 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1917 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1918 sc->sc_state)); 1919 1920 sx_xunlock(&sc->sc_lock); 1921 g_topology_lock(); 1922 cp = g_new_consumer(sc->sc_sync.ds_geom); 1923 error = g_attach(cp, sc->sc_provider); 1924 KASSERT(error == 0, 1925 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1926 error = g_access(cp, 1, 0, 0); 1927 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1928 g_topology_unlock(); 1929 sx_xlock(&sc->sc_lock); 1930 1931 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1932 g_mirror_get_diskname(disk)); 1933 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1934 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1935 KASSERT(disk->d_sync.ds_consumer == NULL, 1936 ("Sync consumer already exists (device=%s, disk=%s).", 1937 sc->sc_name, g_mirror_get_diskname(disk))); 1938 1939 disk->d_sync.ds_consumer = cp; 1940 disk->d_sync.ds_consumer->private = disk; 1941 disk->d_sync.ds_consumer->index = 0; 1942 1943 /* 1944 * Allocate memory for synchronization bios and initialize them. 1945 */ 1946 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1947 M_MIRROR, M_WAITOK); 1948 for (i = 0; i < g_mirror_syncreqs; i++) { 1949 bp = g_alloc_bio(); 1950 disk->d_sync.ds_bios[i] = bp; 1951 bp->bio_parent = NULL; 1952 bp->bio_cmd = BIO_READ; 1953 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1954 bp->bio_cflags = 0; 1955 bp->bio_offset = disk->d_sync.ds_offset; 1956 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1957 disk->d_sync.ds_offset += bp->bio_length; 1958 bp->bio_done = g_mirror_sync_done; 1959 bp->bio_from = disk->d_sync.ds_consumer; 1960 bp->bio_to = sc->sc_provider; 1961 bp->bio_caller1 = (void *)(uintptr_t)i; 1962 } 1963 1964 /* Increase the number of disks in SYNCHRONIZING state. */ 1965 sc->sc_sync.ds_ndisks++; 1966 /* Set the number of in-flight synchronization requests. */ 1967 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1968 1969 /* 1970 * Fire off first synchronization requests. 1971 */ 1972 for (i = 0; i < g_mirror_syncreqs; i++) { 1973 bp = disk->d_sync.ds_bios[i]; 1974 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1975 disk->d_sync.ds_consumer->index++; 1976 /* 1977 * Delay the request if it is colliding with a regular request. 1978 */ 1979 if (g_mirror_regular_collision(sc, bp)) 1980 g_mirror_sync_delay(sc, bp); 1981 else 1982 g_io_request(bp, disk->d_sync.ds_consumer); 1983 } 1984 } 1985 1986 /* 1987 * Stop synchronization process. 1988 * type: 0 - synchronization finished 1989 * 1 - synchronization stopped 1990 */ 1991 static void 1992 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 1993 { 1994 struct g_mirror_softc *sc; 1995 struct g_consumer *cp; 1996 1997 g_topology_assert_not(); 1998 sc = disk->d_softc; 1999 sx_assert(&sc->sc_lock, SX_LOCKED); 2000 2001 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2002 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2003 g_mirror_disk_state2str(disk->d_state))); 2004 if (disk->d_sync.ds_consumer == NULL) 2005 return; 2006 2007 if (type == 0) { 2008 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2009 sc->sc_name, g_mirror_get_diskname(disk)); 2010 } else /* if (type == 1) */ { 2011 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2012 sc->sc_name, g_mirror_get_diskname(disk)); 2013 } 2014 free(disk->d_sync.ds_bios, M_MIRROR); 2015 disk->d_sync.ds_bios = NULL; 2016 cp = disk->d_sync.ds_consumer; 2017 disk->d_sync.ds_consumer = NULL; 2018 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2019 sc->sc_sync.ds_ndisks--; 2020 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2021 g_topology_lock(); 2022 g_mirror_kill_consumer(sc, cp); 2023 g_topology_unlock(); 2024 sx_xlock(&sc->sc_lock); 2025 } 2026 2027 static void 2028 g_mirror_launch_provider(struct g_mirror_softc *sc) 2029 { 2030 struct g_mirror_disk *disk; 2031 struct g_provider *pp, *dp; 2032 2033 sx_assert(&sc->sc_lock, SX_LOCKED); 2034 2035 g_topology_lock(); 2036 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2037 pp->mediasize = sc->sc_mediasize; 2038 pp->sectorsize = sc->sc_sectorsize; 2039 pp->stripesize = 0; 2040 pp->stripeoffset = 0; 2041 2042 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2043 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2044 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2045 2046 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2047 if (disk->d_consumer && disk->d_consumer->provider) { 2048 dp = disk->d_consumer->provider; 2049 if (dp->stripesize > pp->stripesize) { 2050 pp->stripesize = dp->stripesize; 2051 pp->stripeoffset = dp->stripeoffset; 2052 } 2053 /* A provider underneath us doesn't support unmapped */ 2054 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2055 G_MIRROR_DEBUG(0, "cancelling unmapped " 2056 "because of %s\n", dp->name); 2057 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2058 } 2059 } 2060 } 2061 sc->sc_provider = pp; 2062 g_error_provider(pp, 0); 2063 g_topology_unlock(); 2064 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2065 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2066 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2067 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2068 g_mirror_sync_start(disk); 2069 } 2070 } 2071 2072 static void 2073 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2074 { 2075 struct g_mirror_disk *disk; 2076 struct bio *bp; 2077 2078 g_topology_assert_not(); 2079 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2080 sc->sc_name)); 2081 2082 g_topology_lock(); 2083 g_error_provider(sc->sc_provider, ENXIO); 2084 mtx_lock(&sc->sc_queue_mtx); 2085 while ((bp = bioq_first(&sc->sc_queue)) != NULL) { 2086 bioq_remove(&sc->sc_queue, bp); 2087 g_io_deliver(bp, ENXIO); 2088 } 2089 mtx_unlock(&sc->sc_queue_mtx); 2090 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2091 sc->sc_provider->name); 2092 sc->sc_provider->flags |= G_PF_WITHER; 2093 g_orphan_provider(sc->sc_provider, ENXIO); 2094 g_topology_unlock(); 2095 sc->sc_provider = NULL; 2096 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2097 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2098 g_mirror_sync_stop(disk, 1); 2099 } 2100 } 2101 2102 static void 2103 g_mirror_go(void *arg) 2104 { 2105 struct g_mirror_softc *sc; 2106 2107 sc = arg; 2108 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2109 g_mirror_event_send(sc, 0, 2110 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2111 } 2112 2113 static u_int 2114 g_mirror_determine_state(struct g_mirror_disk *disk) 2115 { 2116 struct g_mirror_softc *sc; 2117 u_int state; 2118 2119 sc = disk->d_softc; 2120 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2121 if ((disk->d_flags & 2122 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2123 /* Disk does not need synchronization. */ 2124 state = G_MIRROR_DISK_STATE_ACTIVE; 2125 } else { 2126 if ((sc->sc_flags & 2127 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2128 (disk->d_flags & 2129 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2130 /* 2131 * We can start synchronization from 2132 * the stored offset. 2133 */ 2134 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2135 } else { 2136 state = G_MIRROR_DISK_STATE_STALE; 2137 } 2138 } 2139 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2140 /* 2141 * Reset all synchronization data for this disk, 2142 * because if it even was synchronized, it was 2143 * synchronized to disks with different syncid. 2144 */ 2145 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2146 disk->d_sync.ds_offset = 0; 2147 disk->d_sync.ds_offset_done = 0; 2148 disk->d_sync.ds_syncid = sc->sc_syncid; 2149 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2150 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2151 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2152 } else { 2153 state = G_MIRROR_DISK_STATE_STALE; 2154 } 2155 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2156 /* 2157 * Not good, NOT GOOD! 2158 * It means that mirror was started on stale disks 2159 * and more fresh disk just arrive. 2160 * If there were writes, mirror is broken, sorry. 2161 * I think the best choice here is don't touch 2162 * this disk and inform the user loudly. 2163 */ 2164 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2165 "disk (%s) arrives!! It will not be connected to the " 2166 "running device.", sc->sc_name, 2167 g_mirror_get_diskname(disk)); 2168 g_mirror_destroy_disk(disk); 2169 state = G_MIRROR_DISK_STATE_NONE; 2170 /* Return immediately, because disk was destroyed. */ 2171 return (state); 2172 } 2173 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2174 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2175 return (state); 2176 } 2177 2178 /* 2179 * Update device state. 2180 */ 2181 static void 2182 g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2183 { 2184 struct g_mirror_disk *disk; 2185 u_int state; 2186 2187 sx_assert(&sc->sc_lock, SX_XLOCKED); 2188 2189 switch (sc->sc_state) { 2190 case G_MIRROR_DEVICE_STATE_STARTING: 2191 { 2192 struct g_mirror_disk *pdisk, *tdisk; 2193 u_int dirty, ndisks, genid, syncid; 2194 2195 KASSERT(sc->sc_provider == NULL, 2196 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2197 /* 2198 * Are we ready? We are, if all disks are connected or 2199 * if we have any disks and 'force' is true. 2200 */ 2201 ndisks = g_mirror_ndisks(sc, -1); 2202 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2203 ; 2204 } else if (ndisks == 0) { 2205 /* 2206 * Disks went down in starting phase, so destroy 2207 * device. 2208 */ 2209 callout_drain(&sc->sc_callout); 2210 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2211 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2212 sc->sc_rootmount); 2213 root_mount_rel(sc->sc_rootmount); 2214 sc->sc_rootmount = NULL; 2215 return; 2216 } else { 2217 return; 2218 } 2219 2220 /* 2221 * Activate all disks with the biggest syncid. 2222 */ 2223 if (force) { 2224 /* 2225 * If 'force' is true, we have been called due to 2226 * timeout, so don't bother canceling timeout. 2227 */ 2228 ndisks = 0; 2229 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2230 if ((disk->d_flags & 2231 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2232 ndisks++; 2233 } 2234 } 2235 if (ndisks == 0) { 2236 /* No valid disks found, destroy device. */ 2237 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2238 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2239 __LINE__, sc->sc_rootmount); 2240 root_mount_rel(sc->sc_rootmount); 2241 sc->sc_rootmount = NULL; 2242 return; 2243 } 2244 } else { 2245 /* Cancel timeout. */ 2246 callout_drain(&sc->sc_callout); 2247 } 2248 2249 /* 2250 * Find the biggest genid. 2251 */ 2252 genid = 0; 2253 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2254 if (disk->d_genid > genid) 2255 genid = disk->d_genid; 2256 } 2257 sc->sc_genid = genid; 2258 /* 2259 * Remove all disks without the biggest genid. 2260 */ 2261 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2262 if (disk->d_genid < genid) { 2263 G_MIRROR_DEBUG(0, 2264 "Component %s (device %s) broken, skipping.", 2265 g_mirror_get_diskname(disk), sc->sc_name); 2266 g_mirror_destroy_disk(disk); 2267 } 2268 } 2269 2270 /* 2271 * Find the biggest syncid. 2272 */ 2273 syncid = 0; 2274 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2275 if (disk->d_sync.ds_syncid > syncid) 2276 syncid = disk->d_sync.ds_syncid; 2277 } 2278 2279 /* 2280 * Here we need to look for dirty disks and if all disks 2281 * with the biggest syncid are dirty, we have to choose 2282 * one with the biggest priority and rebuild the rest. 2283 */ 2284 /* 2285 * Find the number of dirty disks with the biggest syncid. 2286 * Find the number of disks with the biggest syncid. 2287 * While here, find a disk with the biggest priority. 2288 */ 2289 dirty = ndisks = 0; 2290 pdisk = NULL; 2291 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2292 if (disk->d_sync.ds_syncid != syncid) 2293 continue; 2294 if ((disk->d_flags & 2295 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2296 continue; 2297 } 2298 ndisks++; 2299 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2300 dirty++; 2301 if (pdisk == NULL || 2302 pdisk->d_priority < disk->d_priority) { 2303 pdisk = disk; 2304 } 2305 } 2306 } 2307 if (dirty == 0) { 2308 /* No dirty disks at all, great. */ 2309 } else if (dirty == ndisks) { 2310 /* 2311 * Force synchronization for all dirty disks except one 2312 * with the biggest priority. 2313 */ 2314 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2315 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2316 "master disk for synchronization.", 2317 g_mirror_get_diskname(pdisk), sc->sc_name); 2318 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2319 if (disk->d_sync.ds_syncid != syncid) 2320 continue; 2321 if ((disk->d_flags & 2322 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2323 continue; 2324 } 2325 KASSERT((disk->d_flags & 2326 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2327 ("Disk %s isn't marked as dirty.", 2328 g_mirror_get_diskname(disk))); 2329 /* Skip the disk with the biggest priority. */ 2330 if (disk == pdisk) 2331 continue; 2332 disk->d_sync.ds_syncid = 0; 2333 } 2334 } else if (dirty < ndisks) { 2335 /* 2336 * Force synchronization for all dirty disks. 2337 * We have some non-dirty disks. 2338 */ 2339 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2340 if (disk->d_sync.ds_syncid != syncid) 2341 continue; 2342 if ((disk->d_flags & 2343 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2344 continue; 2345 } 2346 if ((disk->d_flags & 2347 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2348 continue; 2349 } 2350 disk->d_sync.ds_syncid = 0; 2351 } 2352 } 2353 2354 /* Reset hint. */ 2355 sc->sc_hint = NULL; 2356 sc->sc_syncid = syncid; 2357 if (force) { 2358 /* Remember to bump syncid on first write. */ 2359 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2360 } 2361 state = G_MIRROR_DEVICE_STATE_RUNNING; 2362 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2363 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2364 g_mirror_device_state2str(state)); 2365 sc->sc_state = state; 2366 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2367 state = g_mirror_determine_state(disk); 2368 g_mirror_event_send(disk, state, 2369 G_MIRROR_EVENT_DONTWAIT); 2370 if (state == G_MIRROR_DISK_STATE_STALE) 2371 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2372 } 2373 break; 2374 } 2375 case G_MIRROR_DEVICE_STATE_RUNNING: 2376 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2377 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2378 /* 2379 * No active disks or no disks at all, 2380 * so destroy device. 2381 */ 2382 if (sc->sc_provider != NULL) 2383 g_mirror_destroy_provider(sc); 2384 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2385 break; 2386 } else if (g_mirror_ndisks(sc, 2387 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2388 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2389 /* 2390 * We have active disks, launch provider if it doesn't 2391 * exist. 2392 */ 2393 if (sc->sc_provider == NULL) 2394 g_mirror_launch_provider(sc); 2395 if (sc->sc_rootmount != NULL) { 2396 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2397 __LINE__, sc->sc_rootmount); 2398 root_mount_rel(sc->sc_rootmount); 2399 sc->sc_rootmount = NULL; 2400 } 2401 } 2402 /* 2403 * Genid should be bumped immediately, so do it here. 2404 */ 2405 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2406 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2407 g_mirror_bump_genid(sc); 2408 } 2409 break; 2410 default: 2411 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2412 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2413 break; 2414 } 2415 } 2416 2417 /* 2418 * Update disk state and device state if needed. 2419 */ 2420 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2421 "Disk %s state changed from %s to %s (device %s).", \ 2422 g_mirror_get_diskname(disk), \ 2423 g_mirror_disk_state2str(disk->d_state), \ 2424 g_mirror_disk_state2str(state), sc->sc_name) 2425 static int 2426 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2427 { 2428 struct g_mirror_softc *sc; 2429 2430 sc = disk->d_softc; 2431 sx_assert(&sc->sc_lock, SX_XLOCKED); 2432 2433 again: 2434 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2435 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2436 g_mirror_disk_state2str(state)); 2437 switch (state) { 2438 case G_MIRROR_DISK_STATE_NEW: 2439 /* 2440 * Possible scenarios: 2441 * 1. New disk arrive. 2442 */ 2443 /* Previous state should be NONE. */ 2444 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2445 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2446 g_mirror_disk_state2str(disk->d_state))); 2447 DISK_STATE_CHANGED(); 2448 2449 disk->d_state = state; 2450 if (LIST_EMPTY(&sc->sc_disks)) 2451 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2452 else { 2453 struct g_mirror_disk *dp; 2454 2455 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2456 if (disk->d_priority >= dp->d_priority) { 2457 LIST_INSERT_BEFORE(dp, disk, d_next); 2458 dp = NULL; 2459 break; 2460 } 2461 if (LIST_NEXT(dp, d_next) == NULL) 2462 break; 2463 } 2464 if (dp != NULL) 2465 LIST_INSERT_AFTER(dp, disk, d_next); 2466 } 2467 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2468 sc->sc_name, g_mirror_get_diskname(disk)); 2469 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2470 break; 2471 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2472 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2473 g_mirror_device_state2str(sc->sc_state), 2474 g_mirror_get_diskname(disk), 2475 g_mirror_disk_state2str(disk->d_state))); 2476 state = g_mirror_determine_state(disk); 2477 if (state != G_MIRROR_DISK_STATE_NONE) 2478 goto again; 2479 break; 2480 case G_MIRROR_DISK_STATE_ACTIVE: 2481 /* 2482 * Possible scenarios: 2483 * 1. New disk does not need synchronization. 2484 * 2. Synchronization process finished successfully. 2485 */ 2486 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2487 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2488 g_mirror_device_state2str(sc->sc_state), 2489 g_mirror_get_diskname(disk), 2490 g_mirror_disk_state2str(disk->d_state))); 2491 /* Previous state should be NEW or SYNCHRONIZING. */ 2492 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2493 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2494 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2495 g_mirror_disk_state2str(disk->d_state))); 2496 DISK_STATE_CHANGED(); 2497 2498 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2499 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2500 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2501 g_mirror_sync_stop(disk, 0); 2502 } 2503 disk->d_state = state; 2504 disk->d_sync.ds_offset = 0; 2505 disk->d_sync.ds_offset_done = 0; 2506 g_mirror_update_idle(sc, disk); 2507 g_mirror_update_metadata(disk); 2508 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2509 sc->sc_name, g_mirror_get_diskname(disk)); 2510 break; 2511 case G_MIRROR_DISK_STATE_STALE: 2512 /* 2513 * Possible scenarios: 2514 * 1. Stale disk was connected. 2515 */ 2516 /* Previous state should be NEW. */ 2517 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2518 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2519 g_mirror_disk_state2str(disk->d_state))); 2520 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2521 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2522 g_mirror_device_state2str(sc->sc_state), 2523 g_mirror_get_diskname(disk), 2524 g_mirror_disk_state2str(disk->d_state))); 2525 /* 2526 * STALE state is only possible if device is marked 2527 * NOAUTOSYNC. 2528 */ 2529 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2530 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2531 g_mirror_device_state2str(sc->sc_state), 2532 g_mirror_get_diskname(disk), 2533 g_mirror_disk_state2str(disk->d_state))); 2534 DISK_STATE_CHANGED(); 2535 2536 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2537 disk->d_state = state; 2538 g_mirror_update_metadata(disk); 2539 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2540 sc->sc_name, g_mirror_get_diskname(disk)); 2541 break; 2542 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2543 /* 2544 * Possible scenarios: 2545 * 1. Disk which needs synchronization was connected. 2546 */ 2547 /* Previous state should be NEW. */ 2548 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2549 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2550 g_mirror_disk_state2str(disk->d_state))); 2551 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2552 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2553 g_mirror_device_state2str(sc->sc_state), 2554 g_mirror_get_diskname(disk), 2555 g_mirror_disk_state2str(disk->d_state))); 2556 DISK_STATE_CHANGED(); 2557 2558 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2559 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2560 disk->d_state = state; 2561 if (sc->sc_provider != NULL) { 2562 g_mirror_sync_start(disk); 2563 g_mirror_update_metadata(disk); 2564 } 2565 break; 2566 case G_MIRROR_DISK_STATE_DISCONNECTED: 2567 /* 2568 * Possible scenarios: 2569 * 1. Device wasn't running yet, but disk disappear. 2570 * 2. Disk was active and disapppear. 2571 * 3. Disk disappear during synchronization process. 2572 */ 2573 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2574 /* 2575 * Previous state should be ACTIVE, STALE or 2576 * SYNCHRONIZING. 2577 */ 2578 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2579 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2580 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2581 ("Wrong disk state (%s, %s).", 2582 g_mirror_get_diskname(disk), 2583 g_mirror_disk_state2str(disk->d_state))); 2584 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2585 /* Previous state should be NEW. */ 2586 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2587 ("Wrong disk state (%s, %s).", 2588 g_mirror_get_diskname(disk), 2589 g_mirror_disk_state2str(disk->d_state))); 2590 /* 2591 * Reset bumping syncid if disk disappeared in STARTING 2592 * state. 2593 */ 2594 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2595 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2596 #ifdef INVARIANTS 2597 } else { 2598 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2599 sc->sc_name, 2600 g_mirror_device_state2str(sc->sc_state), 2601 g_mirror_get_diskname(disk), 2602 g_mirror_disk_state2str(disk->d_state))); 2603 #endif 2604 } 2605 DISK_STATE_CHANGED(); 2606 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2607 sc->sc_name, g_mirror_get_diskname(disk)); 2608 2609 g_mirror_destroy_disk(disk); 2610 break; 2611 case G_MIRROR_DISK_STATE_DESTROY: 2612 { 2613 int error; 2614 2615 error = g_mirror_clear_metadata(disk); 2616 if (error != 0) 2617 return (error); 2618 DISK_STATE_CHANGED(); 2619 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2620 sc->sc_name, g_mirror_get_diskname(disk)); 2621 2622 g_mirror_destroy_disk(disk); 2623 sc->sc_ndisks--; 2624 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2625 g_mirror_update_metadata(disk); 2626 } 2627 break; 2628 } 2629 default: 2630 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2631 break; 2632 } 2633 return (0); 2634 } 2635 #undef DISK_STATE_CHANGED 2636 2637 int 2638 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2639 { 2640 struct g_provider *pp; 2641 u_char *buf; 2642 int error; 2643 2644 g_topology_assert(); 2645 2646 error = g_access(cp, 1, 0, 0); 2647 if (error != 0) 2648 return (error); 2649 pp = cp->provider; 2650 g_topology_unlock(); 2651 /* Metadata are stored on last sector. */ 2652 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2653 &error); 2654 g_topology_lock(); 2655 g_access(cp, -1, 0, 0); 2656 if (buf == NULL) { 2657 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2658 cp->provider->name, error); 2659 return (error); 2660 } 2661 2662 /* Decode metadata. */ 2663 error = mirror_metadata_decode(buf, md); 2664 g_free(buf); 2665 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2666 return (EINVAL); 2667 if (md->md_version > G_MIRROR_VERSION) { 2668 G_MIRROR_DEBUG(0, 2669 "Kernel module is too old to handle metadata from %s.", 2670 cp->provider->name); 2671 return (EINVAL); 2672 } 2673 if (error != 0) { 2674 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2675 cp->provider->name); 2676 return (error); 2677 } 2678 2679 return (0); 2680 } 2681 2682 static int 2683 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2684 struct g_mirror_metadata *md) 2685 { 2686 2687 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2688 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2689 pp->name, md->md_did); 2690 return (EEXIST); 2691 } 2692 if (md->md_all != sc->sc_ndisks) { 2693 G_MIRROR_DEBUG(1, 2694 "Invalid '%s' field on disk %s (device %s), skipping.", 2695 "md_all", pp->name, sc->sc_name); 2696 return (EINVAL); 2697 } 2698 if (md->md_slice != sc->sc_slice) { 2699 G_MIRROR_DEBUG(1, 2700 "Invalid '%s' field on disk %s (device %s), skipping.", 2701 "md_slice", pp->name, sc->sc_name); 2702 return (EINVAL); 2703 } 2704 if (md->md_balance != sc->sc_balance) { 2705 G_MIRROR_DEBUG(1, 2706 "Invalid '%s' field on disk %s (device %s), skipping.", 2707 "md_balance", pp->name, sc->sc_name); 2708 return (EINVAL); 2709 } 2710 if (md->md_mediasize != sc->sc_mediasize) { 2711 G_MIRROR_DEBUG(1, 2712 "Invalid '%s' field on disk %s (device %s), skipping.", 2713 "md_mediasize", pp->name, sc->sc_name); 2714 return (EINVAL); 2715 } 2716 if (sc->sc_mediasize > pp->mediasize) { 2717 G_MIRROR_DEBUG(1, 2718 "Invalid size of disk %s (device %s), skipping.", pp->name, 2719 sc->sc_name); 2720 return (EINVAL); 2721 } 2722 if (md->md_sectorsize != sc->sc_sectorsize) { 2723 G_MIRROR_DEBUG(1, 2724 "Invalid '%s' field on disk %s (device %s), skipping.", 2725 "md_sectorsize", pp->name, sc->sc_name); 2726 return (EINVAL); 2727 } 2728 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2729 G_MIRROR_DEBUG(1, 2730 "Invalid sector size of disk %s (device %s), skipping.", 2731 pp->name, sc->sc_name); 2732 return (EINVAL); 2733 } 2734 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2735 G_MIRROR_DEBUG(1, 2736 "Invalid device flags on disk %s (device %s), skipping.", 2737 pp->name, sc->sc_name); 2738 return (EINVAL); 2739 } 2740 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2741 G_MIRROR_DEBUG(1, 2742 "Invalid disk flags on disk %s (device %s), skipping.", 2743 pp->name, sc->sc_name); 2744 return (EINVAL); 2745 } 2746 return (0); 2747 } 2748 2749 int 2750 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2751 struct g_mirror_metadata *md) 2752 { 2753 struct g_mirror_disk *disk; 2754 int error; 2755 2756 g_topology_assert_not(); 2757 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2758 2759 error = g_mirror_check_metadata(sc, pp, md); 2760 if (error != 0) 2761 return (error); 2762 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2763 md->md_genid < sc->sc_genid) { 2764 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2765 pp->name, sc->sc_name); 2766 return (EINVAL); 2767 } 2768 disk = g_mirror_init_disk(sc, pp, md, &error); 2769 if (disk == NULL) 2770 return (error); 2771 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2772 G_MIRROR_EVENT_WAIT); 2773 if (error != 0) 2774 return (error); 2775 if (md->md_version < G_MIRROR_VERSION) { 2776 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2777 pp->name, md->md_version, G_MIRROR_VERSION); 2778 g_mirror_update_metadata(disk); 2779 } 2780 return (0); 2781 } 2782 2783 static void 2784 g_mirror_destroy_delayed(void *arg, int flag) 2785 { 2786 struct g_mirror_softc *sc; 2787 int error; 2788 2789 if (flag == EV_CANCEL) { 2790 G_MIRROR_DEBUG(1, "Destroying canceled."); 2791 return; 2792 } 2793 sc = arg; 2794 g_topology_unlock(); 2795 sx_xlock(&sc->sc_lock); 2796 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2797 ("DESTROY flag set on %s.", sc->sc_name)); 2798 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2799 ("DESTROYING flag not set on %s.", sc->sc_name)); 2800 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2801 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2802 if (error != 0) { 2803 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2804 sx_xunlock(&sc->sc_lock); 2805 } 2806 g_topology_lock(); 2807 } 2808 2809 static int 2810 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2811 { 2812 struct g_mirror_softc *sc; 2813 int dcr, dcw, dce, error = 0; 2814 2815 g_topology_assert(); 2816 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2817 acw, ace); 2818 2819 sc = pp->geom->softc; 2820 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2821 return (0); 2822 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2823 2824 dcr = pp->acr + acr; 2825 dcw = pp->acw + acw; 2826 dce = pp->ace + ace; 2827 2828 g_topology_unlock(); 2829 sx_xlock(&sc->sc_lock); 2830 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2831 LIST_EMPTY(&sc->sc_disks)) { 2832 if (acr > 0 || acw > 0 || ace > 0) 2833 error = ENXIO; 2834 goto end; 2835 } 2836 if (dcw == 0) 2837 g_mirror_idle(sc, dcw); 2838 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2839 if (acr > 0 || acw > 0 || ace > 0) { 2840 error = ENXIO; 2841 goto end; 2842 } 2843 if (dcr == 0 && dcw == 0 && dce == 0) { 2844 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2845 sc, NULL); 2846 } 2847 } 2848 end: 2849 sx_xunlock(&sc->sc_lock); 2850 g_topology_lock(); 2851 return (error); 2852 } 2853 2854 static struct g_geom * 2855 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2856 { 2857 struct g_mirror_softc *sc; 2858 struct g_geom *gp; 2859 int error, timeout; 2860 2861 g_topology_assert(); 2862 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2863 md->md_mid); 2864 2865 /* One disk is minimum. */ 2866 if (md->md_all < 1) 2867 return (NULL); 2868 /* 2869 * Action geom. 2870 */ 2871 gp = g_new_geomf(mp, "%s", md->md_name); 2872 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2873 gp->start = g_mirror_start; 2874 gp->orphan = g_mirror_orphan; 2875 gp->access = g_mirror_access; 2876 gp->dumpconf = g_mirror_dumpconf; 2877 2878 sc->sc_id = md->md_mid; 2879 sc->sc_slice = md->md_slice; 2880 sc->sc_balance = md->md_balance; 2881 sc->sc_mediasize = md->md_mediasize; 2882 sc->sc_sectorsize = md->md_sectorsize; 2883 sc->sc_ndisks = md->md_all; 2884 sc->sc_flags = md->md_mflags; 2885 sc->sc_bump_id = 0; 2886 sc->sc_idle = 1; 2887 sc->sc_last_write = time_uptime; 2888 sc->sc_writes = 0; 2889 sx_init(&sc->sc_lock, "gmirror:lock"); 2890 bioq_init(&sc->sc_queue); 2891 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2892 bioq_init(&sc->sc_regular_delayed); 2893 bioq_init(&sc->sc_inflight); 2894 bioq_init(&sc->sc_sync_delayed); 2895 LIST_INIT(&sc->sc_disks); 2896 TAILQ_INIT(&sc->sc_events); 2897 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2898 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2899 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2900 gp->softc = sc; 2901 sc->sc_geom = gp; 2902 sc->sc_provider = NULL; 2903 /* 2904 * Synchronization geom. 2905 */ 2906 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2907 gp->softc = sc; 2908 gp->orphan = g_mirror_orphan; 2909 sc->sc_sync.ds_geom = gp; 2910 sc->sc_sync.ds_ndisks = 0; 2911 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2912 "g_mirror %s", md->md_name); 2913 if (error != 0) { 2914 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2915 sc->sc_name); 2916 g_destroy_geom(sc->sc_sync.ds_geom); 2917 mtx_destroy(&sc->sc_events_mtx); 2918 mtx_destroy(&sc->sc_queue_mtx); 2919 sx_destroy(&sc->sc_lock); 2920 g_destroy_geom(sc->sc_geom); 2921 free(sc, M_MIRROR); 2922 return (NULL); 2923 } 2924 2925 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2926 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2927 2928 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2929 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2930 /* 2931 * Run timeout. 2932 */ 2933 timeout = g_mirror_timeout * hz; 2934 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2935 return (sc->sc_geom); 2936 } 2937 2938 int 2939 g_mirror_destroy(struct g_mirror_softc *sc, int how) 2940 { 2941 struct g_mirror_disk *disk; 2942 struct g_provider *pp; 2943 2944 g_topology_assert_not(); 2945 if (sc == NULL) 2946 return (ENXIO); 2947 sx_assert(&sc->sc_lock, SX_XLOCKED); 2948 2949 pp = sc->sc_provider; 2950 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2951 switch (how) { 2952 case G_MIRROR_DESTROY_SOFT: 2953 G_MIRROR_DEBUG(1, 2954 "Device %s is still open (r%dw%de%d).", pp->name, 2955 pp->acr, pp->acw, pp->ace); 2956 return (EBUSY); 2957 case G_MIRROR_DESTROY_DELAYED: 2958 G_MIRROR_DEBUG(1, 2959 "Device %s will be destroyed on last close.", 2960 pp->name); 2961 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2962 if (disk->d_state == 2963 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2964 g_mirror_sync_stop(disk, 1); 2965 } 2966 } 2967 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2968 return (EBUSY); 2969 case G_MIRROR_DESTROY_HARD: 2970 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2971 "can't be definitely removed.", pp->name); 2972 } 2973 } 2974 2975 g_topology_lock(); 2976 if (sc->sc_geom->softc == NULL) { 2977 g_topology_unlock(); 2978 return (0); 2979 } 2980 sc->sc_geom->softc = NULL; 2981 sc->sc_sync.ds_geom->softc = NULL; 2982 g_topology_unlock(); 2983 2984 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2985 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 2986 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 2987 sx_xunlock(&sc->sc_lock); 2988 mtx_lock(&sc->sc_queue_mtx); 2989 wakeup(sc); 2990 mtx_unlock(&sc->sc_queue_mtx); 2991 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 2992 while (sc->sc_worker != NULL) 2993 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 2994 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 2995 sx_xlock(&sc->sc_lock); 2996 g_mirror_destroy_device(sc); 2997 free(sc, M_MIRROR); 2998 return (0); 2999 } 3000 3001 static void 3002 g_mirror_taste_orphan(struct g_consumer *cp) 3003 { 3004 3005 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3006 cp->provider->name)); 3007 } 3008 3009 static struct g_geom * 3010 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3011 { 3012 struct g_mirror_metadata md; 3013 struct g_mirror_softc *sc; 3014 struct g_consumer *cp; 3015 struct g_geom *gp; 3016 int error; 3017 3018 g_topology_assert(); 3019 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3020 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3021 3022 gp = g_new_geomf(mp, "mirror:taste"); 3023 /* 3024 * This orphan function should be never called. 3025 */ 3026 gp->orphan = g_mirror_taste_orphan; 3027 cp = g_new_consumer(gp); 3028 g_attach(cp, pp); 3029 error = g_mirror_read_metadata(cp, &md); 3030 g_detach(cp); 3031 g_destroy_consumer(cp); 3032 g_destroy_geom(gp); 3033 if (error != 0) 3034 return (NULL); 3035 gp = NULL; 3036 3037 if (md.md_provider[0] != '\0' && 3038 !g_compare_names(md.md_provider, pp->name)) 3039 return (NULL); 3040 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3041 return (NULL); 3042 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3043 G_MIRROR_DEBUG(0, 3044 "Device %s: provider %s marked as inactive, skipping.", 3045 md.md_name, pp->name); 3046 return (NULL); 3047 } 3048 if (g_mirror_debug >= 2) 3049 mirror_metadata_dump(&md); 3050 3051 /* 3052 * Let's check if device already exists. 3053 */ 3054 sc = NULL; 3055 LIST_FOREACH(gp, &mp->geom, geom) { 3056 sc = gp->softc; 3057 if (sc == NULL) 3058 continue; 3059 if (sc->sc_sync.ds_geom == gp) 3060 continue; 3061 if (strcmp(md.md_name, sc->sc_name) != 0) 3062 continue; 3063 if (md.md_mid != sc->sc_id) { 3064 G_MIRROR_DEBUG(0, "Device %s already configured.", 3065 sc->sc_name); 3066 return (NULL); 3067 } 3068 break; 3069 } 3070 if (gp == NULL) { 3071 gp = g_mirror_create(mp, &md); 3072 if (gp == NULL) { 3073 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3074 md.md_name); 3075 return (NULL); 3076 } 3077 sc = gp->softc; 3078 } 3079 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3080 g_topology_unlock(); 3081 sx_xlock(&sc->sc_lock); 3082 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3083 error = g_mirror_add_disk(sc, pp, &md); 3084 if (error != 0) { 3085 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3086 pp->name, gp->name, error); 3087 if (LIST_EMPTY(&sc->sc_disks)) { 3088 g_cancel_event(sc); 3089 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3090 g_topology_lock(); 3091 return (NULL); 3092 } 3093 gp = NULL; 3094 } 3095 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3096 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3097 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3098 g_topology_lock(); 3099 return (NULL); 3100 } 3101 sx_xunlock(&sc->sc_lock); 3102 g_topology_lock(); 3103 return (gp); 3104 } 3105 3106 static int 3107 g_mirror_destroy_geom(struct gctl_req *req __unused, 3108 struct g_class *mp __unused, struct g_geom *gp) 3109 { 3110 struct g_mirror_softc *sc; 3111 int error; 3112 3113 g_topology_unlock(); 3114 sc = gp->softc; 3115 sx_xlock(&sc->sc_lock); 3116 g_cancel_event(sc); 3117 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3118 if (error != 0) 3119 sx_xunlock(&sc->sc_lock); 3120 g_topology_lock(); 3121 return (error); 3122 } 3123 3124 static void 3125 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3126 struct g_consumer *cp, struct g_provider *pp) 3127 { 3128 struct g_mirror_softc *sc; 3129 3130 g_topology_assert(); 3131 3132 sc = gp->softc; 3133 if (sc == NULL) 3134 return; 3135 /* Skip synchronization geom. */ 3136 if (gp == sc->sc_sync.ds_geom) 3137 return; 3138 if (pp != NULL) { 3139 /* Nothing here. */ 3140 } else if (cp != NULL) { 3141 struct g_mirror_disk *disk; 3142 3143 disk = cp->private; 3144 if (disk == NULL) 3145 return; 3146 g_topology_unlock(); 3147 sx_xlock(&sc->sc_lock); 3148 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3149 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3150 sbuf_printf(sb, "%s<Synchronized>", indent); 3151 if (disk->d_sync.ds_offset == 0) 3152 sbuf_printf(sb, "0%%"); 3153 else { 3154 sbuf_printf(sb, "%u%%", 3155 (u_int)((disk->d_sync.ds_offset * 100) / 3156 sc->sc_provider->mediasize)); 3157 } 3158 sbuf_printf(sb, "</Synchronized>\n"); 3159 if (disk->d_sync.ds_offset > 0) { 3160 sbuf_printf(sb, "%s<BytesSynced>%jd" 3161 "</BytesSynced>\n", indent, 3162 (intmax_t)disk->d_sync.ds_offset); 3163 } 3164 } 3165 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3166 disk->d_sync.ds_syncid); 3167 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3168 disk->d_genid); 3169 sbuf_printf(sb, "%s<Flags>", indent); 3170 if (disk->d_flags == 0) 3171 sbuf_printf(sb, "NONE"); 3172 else { 3173 int first = 1; 3174 3175 #define ADD_FLAG(flag, name) do { \ 3176 if ((disk->d_flags & (flag)) != 0) { \ 3177 if (!first) \ 3178 sbuf_printf(sb, ", "); \ 3179 else \ 3180 first = 0; \ 3181 sbuf_printf(sb, name); \ 3182 } \ 3183 } while (0) 3184 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3185 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3186 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3187 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3188 "SYNCHRONIZING"); 3189 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3190 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3191 #undef ADD_FLAG 3192 } 3193 sbuf_printf(sb, "</Flags>\n"); 3194 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3195 disk->d_priority); 3196 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3197 g_mirror_disk_state2str(disk->d_state)); 3198 sx_xunlock(&sc->sc_lock); 3199 g_topology_lock(); 3200 } else { 3201 g_topology_unlock(); 3202 sx_xlock(&sc->sc_lock); 3203 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3204 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3205 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3206 sbuf_printf(sb, "%s<Flags>", indent); 3207 if (sc->sc_flags == 0) 3208 sbuf_printf(sb, "NONE"); 3209 else { 3210 int first = 1; 3211 3212 #define ADD_FLAG(flag, name) do { \ 3213 if ((sc->sc_flags & (flag)) != 0) { \ 3214 if (!first) \ 3215 sbuf_printf(sb, ", "); \ 3216 else \ 3217 first = 0; \ 3218 sbuf_printf(sb, name); \ 3219 } \ 3220 } while (0) 3221 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3222 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3223 #undef ADD_FLAG 3224 } 3225 sbuf_printf(sb, "</Flags>\n"); 3226 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3227 (u_int)sc->sc_slice); 3228 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3229 balance_name(sc->sc_balance)); 3230 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3231 sc->sc_ndisks); 3232 sbuf_printf(sb, "%s<State>", indent); 3233 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3234 sbuf_printf(sb, "%s", "STARTING"); 3235 else if (sc->sc_ndisks == 3236 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3237 sbuf_printf(sb, "%s", "COMPLETE"); 3238 else 3239 sbuf_printf(sb, "%s", "DEGRADED"); 3240 sbuf_printf(sb, "</State>\n"); 3241 sx_xunlock(&sc->sc_lock); 3242 g_topology_lock(); 3243 } 3244 } 3245 3246 static void 3247 g_mirror_shutdown_post_sync(void *arg, int howto) 3248 { 3249 struct g_class *mp; 3250 struct g_geom *gp, *gp2; 3251 struct g_mirror_softc *sc; 3252 int error; 3253 3254 mp = arg; 3255 DROP_GIANT(); 3256 g_topology_lock(); 3257 g_mirror_shutdown = 1; 3258 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3259 if ((sc = gp->softc) == NULL) 3260 continue; 3261 /* Skip synchronization geom. */ 3262 if (gp == sc->sc_sync.ds_geom) 3263 continue; 3264 g_topology_unlock(); 3265 sx_xlock(&sc->sc_lock); 3266 g_mirror_idle(sc, -1); 3267 g_cancel_event(sc); 3268 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3269 if (error != 0) 3270 sx_xunlock(&sc->sc_lock); 3271 g_topology_lock(); 3272 } 3273 g_topology_unlock(); 3274 PICKUP_GIANT(); 3275 } 3276 3277 static void 3278 g_mirror_init(struct g_class *mp) 3279 { 3280 3281 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3282 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3283 if (g_mirror_post_sync == NULL) 3284 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3285 } 3286 3287 static void 3288 g_mirror_fini(struct g_class *mp) 3289 { 3290 3291 if (g_mirror_post_sync != NULL) 3292 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3293 } 3294 3295 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3296