1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bio.h> 35 #include <sys/eventhandler.h> 36 #include <sys/fail.h> 37 #include <sys/kernel.h> 38 #include <sys/kthread.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/proc.h> 44 #include <sys/sbuf.h> 45 #include <sys/sched.h> 46 #include <sys/sx.h> 47 #include <sys/sysctl.h> 48 49 #include <geom/geom.h> 50 #include <geom/mirror/g_mirror.h> 51 52 FEATURE(geom_mirror, "GEOM mirroring support"); 53 54 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 55 56 SYSCTL_DECL(_kern_geom); 57 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 58 "GEOM_MIRROR stuff"); 59 int g_mirror_debug = 0; 60 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 61 "Debug level"); 62 bool g_launch_mirror_before_timeout = true; 63 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, 64 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, 65 "If false, force gmirror to wait out the full kern.geom.mirror.timeout " 66 "before launching mirrors"); 67 static u_int g_mirror_timeout = 4; 68 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 69 0, "Time to wait on all mirror components"); 70 static u_int g_mirror_idletime = 5; 71 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 72 &g_mirror_idletime, 0, "Mark components as clean when idling"); 73 static u_int g_mirror_disconnect_on_failure = 1; 74 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 75 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 76 static u_int g_mirror_syncreqs = 2; 77 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 78 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 79 static u_int g_mirror_sync_period = 5; 80 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, 81 &g_mirror_sync_period, 0, 82 "Metadata update period during synchronization, in seconds"); 83 84 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 85 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 86 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 87 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 88 } while (0) 89 90 static eventhandler_tag g_mirror_post_sync = NULL; 91 static int g_mirror_shutdown = 0; 92 93 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 94 static g_taste_t g_mirror_taste; 95 static g_init_t g_mirror_init; 96 static g_fini_t g_mirror_fini; 97 static g_provgone_t g_mirror_providergone; 98 static g_resize_t g_mirror_resize; 99 100 struct g_class g_mirror_class = { 101 .name = G_MIRROR_CLASS_NAME, 102 .version = G_VERSION, 103 .ctlreq = g_mirror_config, 104 .taste = g_mirror_taste, 105 .destroy_geom = g_mirror_destroy_geom, 106 .init = g_mirror_init, 107 .fini = g_mirror_fini, 108 .providergone = g_mirror_providergone, 109 .resize = g_mirror_resize 110 }; 111 112 113 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 114 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 115 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force); 116 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 117 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 118 static int g_mirror_refresh_device(struct g_mirror_softc *sc, 119 const struct g_provider *pp, const struct g_mirror_metadata *md); 120 static void g_mirror_sync_reinit(const struct g_mirror_disk *disk, 121 struct bio *bp, off_t offset); 122 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 123 static void g_mirror_register_request(struct g_mirror_softc *sc, 124 struct bio *bp); 125 static void g_mirror_sync_release(struct g_mirror_softc *sc); 126 127 128 static const char * 129 g_mirror_disk_state2str(int state) 130 { 131 132 switch (state) { 133 case G_MIRROR_DISK_STATE_NONE: 134 return ("NONE"); 135 case G_MIRROR_DISK_STATE_NEW: 136 return ("NEW"); 137 case G_MIRROR_DISK_STATE_ACTIVE: 138 return ("ACTIVE"); 139 case G_MIRROR_DISK_STATE_STALE: 140 return ("STALE"); 141 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 142 return ("SYNCHRONIZING"); 143 case G_MIRROR_DISK_STATE_DISCONNECTED: 144 return ("DISCONNECTED"); 145 case G_MIRROR_DISK_STATE_DESTROY: 146 return ("DESTROY"); 147 default: 148 return ("INVALID"); 149 } 150 } 151 152 static const char * 153 g_mirror_device_state2str(int state) 154 { 155 156 switch (state) { 157 case G_MIRROR_DEVICE_STATE_STARTING: 158 return ("STARTING"); 159 case G_MIRROR_DEVICE_STATE_RUNNING: 160 return ("RUNNING"); 161 default: 162 return ("INVALID"); 163 } 164 } 165 166 static const char * 167 g_mirror_get_diskname(struct g_mirror_disk *disk) 168 { 169 170 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 171 return ("[unknown]"); 172 return (disk->d_name); 173 } 174 175 /* 176 * --- Events handling functions --- 177 * Events in geom_mirror are used to maintain disks and device status 178 * from one thread to simplify locking. 179 */ 180 static void 181 g_mirror_event_free(struct g_mirror_event *ep) 182 { 183 184 free(ep, M_MIRROR); 185 } 186 187 int 188 g_mirror_event_send(void *arg, int state, int flags) 189 { 190 struct g_mirror_softc *sc; 191 struct g_mirror_disk *disk; 192 struct g_mirror_event *ep; 193 int error; 194 195 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 196 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 197 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 198 disk = NULL; 199 sc = arg; 200 } else { 201 disk = arg; 202 sc = disk->d_softc; 203 } 204 ep->e_disk = disk; 205 ep->e_state = state; 206 ep->e_flags = flags; 207 ep->e_error = 0; 208 mtx_lock(&sc->sc_events_mtx); 209 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 210 mtx_unlock(&sc->sc_events_mtx); 211 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 212 mtx_lock(&sc->sc_queue_mtx); 213 wakeup(sc); 214 mtx_unlock(&sc->sc_queue_mtx); 215 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 216 return (0); 217 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 218 sx_xunlock(&sc->sc_lock); 219 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 220 mtx_lock(&sc->sc_events_mtx); 221 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 222 hz * 5); 223 } 224 error = ep->e_error; 225 g_mirror_event_free(ep); 226 sx_xlock(&sc->sc_lock); 227 return (error); 228 } 229 230 static struct g_mirror_event * 231 g_mirror_event_first(struct g_mirror_softc *sc) 232 { 233 struct g_mirror_event *ep; 234 235 mtx_lock(&sc->sc_events_mtx); 236 ep = TAILQ_FIRST(&sc->sc_events); 237 mtx_unlock(&sc->sc_events_mtx); 238 return (ep); 239 } 240 241 static void 242 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 243 { 244 245 mtx_lock(&sc->sc_events_mtx); 246 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 247 mtx_unlock(&sc->sc_events_mtx); 248 } 249 250 static void 251 g_mirror_event_cancel(struct g_mirror_disk *disk) 252 { 253 struct g_mirror_softc *sc; 254 struct g_mirror_event *ep, *tmpep; 255 256 sc = disk->d_softc; 257 sx_assert(&sc->sc_lock, SX_XLOCKED); 258 259 mtx_lock(&sc->sc_events_mtx); 260 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 261 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 262 continue; 263 if (ep->e_disk != disk) 264 continue; 265 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 266 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 267 g_mirror_event_free(ep); 268 else { 269 ep->e_error = ECANCELED; 270 wakeup(ep); 271 } 272 } 273 mtx_unlock(&sc->sc_events_mtx); 274 } 275 276 /* 277 * Return the number of disks in given state. 278 * If state is equal to -1, count all connected disks. 279 */ 280 u_int 281 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 282 { 283 struct g_mirror_disk *disk; 284 u_int n = 0; 285 286 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 287 if (state == -1 || disk->d_state == state) 288 n++; 289 } 290 return (n); 291 } 292 293 /* 294 * Find a disk in mirror by its disk ID. 295 */ 296 static struct g_mirror_disk * 297 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 298 { 299 struct g_mirror_disk *disk; 300 301 sx_assert(&sc->sc_lock, SX_XLOCKED); 302 303 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 304 if (disk->d_id == id) 305 return (disk); 306 } 307 return (NULL); 308 } 309 310 static u_int 311 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 312 { 313 struct bio *bp; 314 u_int nreqs = 0; 315 316 mtx_lock(&sc->sc_queue_mtx); 317 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) { 318 if (bp->bio_from == cp) 319 nreqs++; 320 } 321 mtx_unlock(&sc->sc_queue_mtx); 322 return (nreqs); 323 } 324 325 static int 326 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 327 { 328 329 if (cp->index > 0) { 330 G_MIRROR_DEBUG(2, 331 "I/O requests for %s exist, can't destroy it now.", 332 cp->provider->name); 333 return (1); 334 } 335 if (g_mirror_nrequests(sc, cp) > 0) { 336 G_MIRROR_DEBUG(2, 337 "I/O requests for %s in queue, can't destroy it now.", 338 cp->provider->name); 339 return (1); 340 } 341 return (0); 342 } 343 344 static void 345 g_mirror_destroy_consumer(void *arg, int flags __unused) 346 { 347 struct g_consumer *cp; 348 349 g_topology_assert(); 350 351 cp = arg; 352 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 353 g_detach(cp); 354 g_destroy_consumer(cp); 355 } 356 357 static void 358 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 359 { 360 struct g_provider *pp; 361 int retaste_wait; 362 363 g_topology_assert(); 364 365 cp->private = NULL; 366 if (g_mirror_is_busy(sc, cp)) 367 return; 368 pp = cp->provider; 369 retaste_wait = 0; 370 if (cp->acw == 1) { 371 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 372 retaste_wait = 1; 373 } 374 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 375 -cp->acw, -cp->ace, 0); 376 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 377 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 378 if (retaste_wait) { 379 /* 380 * After retaste event was send (inside g_access()), we can send 381 * event to detach and destroy consumer. 382 * A class, which has consumer to the given provider connected 383 * will not receive retaste event for the provider. 384 * This is the way how I ignore retaste events when I close 385 * consumers opened for write: I detach and destroy consumer 386 * after retaste event is sent. 387 */ 388 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 389 return; 390 } 391 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 392 g_detach(cp); 393 g_destroy_consumer(cp); 394 } 395 396 static int 397 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 398 { 399 struct g_consumer *cp; 400 int error; 401 402 g_topology_assert_not(); 403 KASSERT(disk->d_consumer == NULL, 404 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 405 406 g_topology_lock(); 407 cp = g_new_consumer(disk->d_softc->sc_geom); 408 cp->flags |= G_CF_DIRECT_RECEIVE; 409 error = g_attach(cp, pp); 410 if (error != 0) { 411 g_destroy_consumer(cp); 412 g_topology_unlock(); 413 return (error); 414 } 415 error = g_access(cp, 1, 1, 1); 416 if (error != 0) { 417 g_detach(cp); 418 g_destroy_consumer(cp); 419 g_topology_unlock(); 420 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 421 pp->name, error); 422 return (error); 423 } 424 g_topology_unlock(); 425 disk->d_consumer = cp; 426 disk->d_consumer->private = disk; 427 disk->d_consumer->index = 0; 428 429 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 430 return (0); 431 } 432 433 static void 434 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 435 { 436 437 g_topology_assert(); 438 439 if (cp == NULL) 440 return; 441 if (cp->provider != NULL) 442 g_mirror_kill_consumer(sc, cp); 443 else 444 g_destroy_consumer(cp); 445 } 446 447 /* 448 * Initialize disk. This means allocate memory, create consumer, attach it 449 * to the provider and open access (r1w1e1) to it. 450 */ 451 static struct g_mirror_disk * 452 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 453 struct g_mirror_metadata *md, int *errorp) 454 { 455 struct g_mirror_disk *disk; 456 int i, error; 457 458 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 459 if (disk == NULL) { 460 error = ENOMEM; 461 goto fail; 462 } 463 disk->d_softc = sc; 464 error = g_mirror_connect_disk(disk, pp); 465 if (error != 0) 466 goto fail; 467 disk->d_id = md->md_did; 468 disk->d_state = G_MIRROR_DISK_STATE_NONE; 469 disk->d_priority = md->md_priority; 470 disk->d_flags = md->md_dflags; 471 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 472 if (error == 0 && i != 0) 473 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 474 if (md->md_provider[0] != '\0') 475 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 476 disk->d_sync.ds_consumer = NULL; 477 disk->d_sync.ds_offset = md->md_sync_offset; 478 disk->d_sync.ds_offset_done = md->md_sync_offset; 479 disk->d_sync.ds_update_ts = time_uptime; 480 disk->d_genid = md->md_genid; 481 disk->d_sync.ds_syncid = md->md_syncid; 482 disk->d_init_ndisks = md->md_all; 483 disk->d_init_slice = md->md_slice; 484 disk->d_init_balance = md->md_balance; 485 disk->d_init_mediasize = md->md_mediasize; 486 if (errorp != NULL) 487 *errorp = 0; 488 return (disk); 489 fail: 490 if (errorp != NULL) 491 *errorp = error; 492 if (disk != NULL) 493 free(disk, M_MIRROR); 494 return (NULL); 495 } 496 497 static void 498 g_mirror_destroy_disk(struct g_mirror_disk *disk) 499 { 500 struct g_mirror_softc *sc; 501 502 g_topology_assert_not(); 503 sc = disk->d_softc; 504 sx_assert(&sc->sc_lock, SX_XLOCKED); 505 506 g_topology_lock(); 507 LIST_REMOVE(disk, d_next); 508 g_topology_unlock(); 509 g_mirror_event_cancel(disk); 510 if (sc->sc_hint == disk) 511 sc->sc_hint = NULL; 512 switch (disk->d_state) { 513 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 514 g_mirror_sync_stop(disk, 1); 515 /* FALLTHROUGH */ 516 case G_MIRROR_DISK_STATE_NEW: 517 case G_MIRROR_DISK_STATE_STALE: 518 case G_MIRROR_DISK_STATE_ACTIVE: 519 g_topology_lock(); 520 g_mirror_disconnect_consumer(sc, disk->d_consumer); 521 g_topology_unlock(); 522 free(disk, M_MIRROR); 523 break; 524 default: 525 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 526 g_mirror_get_diskname(disk), 527 g_mirror_disk_state2str(disk->d_state))); 528 } 529 } 530 531 static void 532 g_mirror_free_device(struct g_mirror_softc *sc) 533 { 534 535 g_topology_assert(); 536 537 mtx_destroy(&sc->sc_queue_mtx); 538 mtx_destroy(&sc->sc_events_mtx); 539 mtx_destroy(&sc->sc_done_mtx); 540 sx_destroy(&sc->sc_lock); 541 free(sc, M_MIRROR); 542 } 543 544 static void 545 g_mirror_providergone(struct g_provider *pp) 546 { 547 struct g_mirror_softc *sc = pp->private; 548 549 if ((--sc->sc_refcnt) == 0) 550 g_mirror_free_device(sc); 551 } 552 553 static void 554 g_mirror_destroy_device(struct g_mirror_softc *sc) 555 { 556 struct g_mirror_disk *disk; 557 struct g_mirror_event *ep; 558 struct g_geom *gp; 559 struct g_consumer *cp, *tmpcp; 560 561 g_topology_assert_not(); 562 sx_assert(&sc->sc_lock, SX_XLOCKED); 563 564 gp = sc->sc_geom; 565 if (sc->sc_provider != NULL) 566 g_mirror_destroy_provider(sc); 567 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 568 disk = LIST_FIRST(&sc->sc_disks)) { 569 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 570 g_mirror_update_metadata(disk); 571 g_mirror_destroy_disk(disk); 572 } 573 while ((ep = g_mirror_event_first(sc)) != NULL) { 574 g_mirror_event_remove(sc, ep); 575 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 576 g_mirror_event_free(ep); 577 else { 578 ep->e_error = ECANCELED; 579 ep->e_flags |= G_MIRROR_EVENT_DONE; 580 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 581 mtx_lock(&sc->sc_events_mtx); 582 wakeup(ep); 583 mtx_unlock(&sc->sc_events_mtx); 584 } 585 } 586 callout_drain(&sc->sc_callout); 587 588 g_topology_lock(); 589 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 590 g_mirror_disconnect_consumer(sc, cp); 591 } 592 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 593 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 594 g_wither_geom(gp, ENXIO); 595 sx_xunlock(&sc->sc_lock); 596 if ((--sc->sc_refcnt) == 0) 597 g_mirror_free_device(sc); 598 g_topology_unlock(); 599 } 600 601 static void 602 g_mirror_orphan(struct g_consumer *cp) 603 { 604 struct g_mirror_disk *disk; 605 606 g_topology_assert(); 607 608 disk = cp->private; 609 if (disk == NULL) 610 return; 611 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 612 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 613 G_MIRROR_EVENT_DONTWAIT); 614 } 615 616 /* 617 * Function should return the next active disk on the list. 618 * It is possible that it will be the same disk as given. 619 * If there are no active disks on list, NULL is returned. 620 */ 621 static __inline struct g_mirror_disk * 622 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 623 { 624 struct g_mirror_disk *dp; 625 626 for (dp = LIST_NEXT(disk, d_next); dp != disk; 627 dp = LIST_NEXT(dp, d_next)) { 628 if (dp == NULL) 629 dp = LIST_FIRST(&sc->sc_disks); 630 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 631 break; 632 } 633 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 634 return (NULL); 635 return (dp); 636 } 637 638 static struct g_mirror_disk * 639 g_mirror_get_disk(struct g_mirror_softc *sc) 640 { 641 struct g_mirror_disk *disk; 642 643 if (sc->sc_hint == NULL) { 644 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 645 if (sc->sc_hint == NULL) 646 return (NULL); 647 } 648 disk = sc->sc_hint; 649 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 650 disk = g_mirror_find_next(sc, disk); 651 if (disk == NULL) 652 return (NULL); 653 } 654 sc->sc_hint = g_mirror_find_next(sc, disk); 655 return (disk); 656 } 657 658 static int 659 g_mirror_write_metadata(struct g_mirror_disk *disk, 660 struct g_mirror_metadata *md) 661 { 662 struct g_mirror_softc *sc; 663 struct g_consumer *cp; 664 off_t offset, length; 665 u_char *sector; 666 int error = 0; 667 668 g_topology_assert_not(); 669 sc = disk->d_softc; 670 sx_assert(&sc->sc_lock, SX_LOCKED); 671 672 cp = disk->d_consumer; 673 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 674 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 675 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 676 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 677 cp->acw, cp->ace)); 678 length = cp->provider->sectorsize; 679 offset = cp->provider->mediasize - length; 680 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 681 if (md != NULL && 682 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 683 /* 684 * Handle the case, when the size of parent provider reduced. 685 */ 686 if (offset < md->md_mediasize) 687 error = ENOSPC; 688 else 689 mirror_metadata_encode(md, sector); 690 } 691 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 692 if (error == 0) 693 error = g_write_data(cp, offset, sector, length); 694 free(sector, M_MIRROR); 695 if (error != 0) { 696 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 697 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 698 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 699 "(device=%s, error=%d).", 700 g_mirror_get_diskname(disk), sc->sc_name, error); 701 } else { 702 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 703 "(device=%s, error=%d).", 704 g_mirror_get_diskname(disk), sc->sc_name, error); 705 } 706 if (g_mirror_disconnect_on_failure && 707 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 708 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 709 g_mirror_event_send(disk, 710 G_MIRROR_DISK_STATE_DISCONNECTED, 711 G_MIRROR_EVENT_DONTWAIT); 712 } 713 } 714 return (error); 715 } 716 717 static int 718 g_mirror_clear_metadata(struct g_mirror_disk *disk) 719 { 720 int error; 721 722 g_topology_assert_not(); 723 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 724 725 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 726 return (0); 727 error = g_mirror_write_metadata(disk, NULL); 728 if (error == 0) { 729 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 730 g_mirror_get_diskname(disk)); 731 } else { 732 G_MIRROR_DEBUG(0, 733 "Cannot clear metadata on disk %s (error=%d).", 734 g_mirror_get_diskname(disk), error); 735 } 736 return (error); 737 } 738 739 void 740 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 741 struct g_mirror_metadata *md) 742 { 743 744 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 745 md->md_version = G_MIRROR_VERSION; 746 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 747 md->md_mid = sc->sc_id; 748 md->md_all = sc->sc_ndisks; 749 md->md_slice = sc->sc_slice; 750 md->md_balance = sc->sc_balance; 751 md->md_genid = sc->sc_genid; 752 md->md_mediasize = sc->sc_mediasize; 753 md->md_sectorsize = sc->sc_sectorsize; 754 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 755 bzero(md->md_provider, sizeof(md->md_provider)); 756 if (disk == NULL) { 757 md->md_did = arc4random(); 758 md->md_priority = 0; 759 md->md_syncid = 0; 760 md->md_dflags = 0; 761 md->md_sync_offset = 0; 762 md->md_provsize = 0; 763 } else { 764 md->md_did = disk->d_id; 765 md->md_priority = disk->d_priority; 766 md->md_syncid = disk->d_sync.ds_syncid; 767 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 768 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 769 md->md_sync_offset = disk->d_sync.ds_offset_done; 770 else 771 md->md_sync_offset = 0; 772 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 773 strlcpy(md->md_provider, 774 disk->d_consumer->provider->name, 775 sizeof(md->md_provider)); 776 } 777 md->md_provsize = disk->d_consumer->provider->mediasize; 778 } 779 } 780 781 void 782 g_mirror_update_metadata(struct g_mirror_disk *disk) 783 { 784 struct g_mirror_softc *sc; 785 struct g_mirror_metadata md; 786 int error; 787 788 g_topology_assert_not(); 789 sc = disk->d_softc; 790 sx_assert(&sc->sc_lock, SX_LOCKED); 791 792 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 793 return; 794 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 795 g_mirror_fill_metadata(sc, disk, &md); 796 error = g_mirror_write_metadata(disk, &md); 797 if (error == 0) { 798 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 799 g_mirror_get_diskname(disk)); 800 } else { 801 G_MIRROR_DEBUG(0, 802 "Cannot update metadata on disk %s (error=%d).", 803 g_mirror_get_diskname(disk), error); 804 } 805 } 806 807 static void 808 g_mirror_bump_syncid(struct g_mirror_softc *sc) 809 { 810 struct g_mirror_disk *disk; 811 812 g_topology_assert_not(); 813 sx_assert(&sc->sc_lock, SX_XLOCKED); 814 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 815 ("%s called with no active disks (device=%s).", __func__, 816 sc->sc_name)); 817 818 sc->sc_syncid++; 819 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 820 sc->sc_syncid); 821 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 822 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 823 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 824 disk->d_sync.ds_syncid = sc->sc_syncid; 825 g_mirror_update_metadata(disk); 826 } 827 } 828 } 829 830 static void 831 g_mirror_bump_genid(struct g_mirror_softc *sc) 832 { 833 struct g_mirror_disk *disk; 834 835 g_topology_assert_not(); 836 sx_assert(&sc->sc_lock, SX_XLOCKED); 837 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 838 ("%s called with no active disks (device=%s).", __func__, 839 sc->sc_name)); 840 841 sc->sc_genid++; 842 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 843 sc->sc_genid); 844 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 845 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 846 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 847 disk->d_genid = sc->sc_genid; 848 g_mirror_update_metadata(disk); 849 } 850 } 851 } 852 853 static int 854 g_mirror_idle(struct g_mirror_softc *sc, int acw) 855 { 856 struct g_mirror_disk *disk; 857 int timeout; 858 859 g_topology_assert_not(); 860 sx_assert(&sc->sc_lock, SX_XLOCKED); 861 862 if (sc->sc_provider == NULL) 863 return (0); 864 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 865 return (0); 866 if (sc->sc_idle) 867 return (0); 868 if (sc->sc_writes > 0) 869 return (0); 870 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 871 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 872 if (!g_mirror_shutdown && timeout > 0) 873 return (timeout); 874 } 875 sc->sc_idle = 1; 876 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 877 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 878 continue; 879 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 880 g_mirror_get_diskname(disk), sc->sc_name); 881 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 882 g_mirror_update_metadata(disk); 883 } 884 return (0); 885 } 886 887 static void 888 g_mirror_unidle(struct g_mirror_softc *sc) 889 { 890 struct g_mirror_disk *disk; 891 892 g_topology_assert_not(); 893 sx_assert(&sc->sc_lock, SX_XLOCKED); 894 895 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 896 return; 897 sc->sc_idle = 0; 898 sc->sc_last_write = time_uptime; 899 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 900 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 901 continue; 902 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 903 g_mirror_get_diskname(disk), sc->sc_name); 904 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 905 g_mirror_update_metadata(disk); 906 } 907 } 908 909 static void 910 g_mirror_done(struct bio *bp) 911 { 912 struct g_mirror_softc *sc; 913 914 sc = bp->bio_from->geom->softc; 915 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 916 mtx_lock(&sc->sc_queue_mtx); 917 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 918 mtx_unlock(&sc->sc_queue_mtx); 919 wakeup(sc); 920 } 921 922 static void 923 g_mirror_regular_request_error(struct g_mirror_softc *sc, 924 struct g_mirror_disk *disk, struct bio *bp) 925 { 926 927 if (bp->bio_cmd == BIO_FLUSH && bp->bio_error == EOPNOTSUPP) 928 return; 929 930 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 931 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 932 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 933 bp->bio_error); 934 } else { 935 G_MIRROR_LOGREQ(1, bp, "Request failed (error=%d).", 936 bp->bio_error); 937 } 938 if (g_mirror_disconnect_on_failure && 939 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 940 if (bp->bio_error == ENXIO && 941 bp->bio_cmd == BIO_READ) 942 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 943 else if (bp->bio_error == ENXIO) 944 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW; 945 else 946 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 947 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 948 G_MIRROR_EVENT_DONTWAIT); 949 } 950 } 951 952 static void 953 g_mirror_regular_request(struct g_mirror_softc *sc, struct bio *bp) 954 { 955 struct g_mirror_disk *disk; 956 struct bio *pbp; 957 958 g_topology_assert_not(); 959 KASSERT(sc->sc_provider == bp->bio_parent->bio_to, 960 ("regular request %p with unexpected origin", bp)); 961 962 pbp = bp->bio_parent; 963 bp->bio_from->index--; 964 if (bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_DELETE) 965 sc->sc_writes--; 966 disk = bp->bio_from->private; 967 if (disk == NULL) { 968 g_topology_lock(); 969 g_mirror_kill_consumer(sc, bp->bio_from); 970 g_topology_unlock(); 971 } 972 973 switch (bp->bio_cmd) { 974 case BIO_READ: 975 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read, 976 bp->bio_error); 977 break; 978 case BIO_WRITE: 979 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write, 980 bp->bio_error); 981 break; 982 case BIO_DELETE: 983 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_delete, 984 bp->bio_error); 985 break; 986 case BIO_FLUSH: 987 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_flush, 988 bp->bio_error); 989 break; 990 } 991 992 pbp->bio_inbed++; 993 KASSERT(pbp->bio_inbed <= pbp->bio_children, 994 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 995 pbp->bio_children)); 996 if (bp->bio_error == 0 && pbp->bio_error == 0) { 997 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 998 g_destroy_bio(bp); 999 if (pbp->bio_children == pbp->bio_inbed) { 1000 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 1001 pbp->bio_completed = pbp->bio_length; 1002 if (pbp->bio_cmd == BIO_WRITE || 1003 pbp->bio_cmd == BIO_DELETE) { 1004 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1005 /* Release delayed sync requests if possible. */ 1006 g_mirror_sync_release(sc); 1007 } 1008 g_io_deliver(pbp, pbp->bio_error); 1009 } 1010 return; 1011 } else if (bp->bio_error != 0) { 1012 if (pbp->bio_error == 0) 1013 pbp->bio_error = bp->bio_error; 1014 if (disk != NULL) 1015 g_mirror_regular_request_error(sc, disk, bp); 1016 switch (pbp->bio_cmd) { 1017 case BIO_DELETE: 1018 case BIO_WRITE: 1019 case BIO_FLUSH: 1020 pbp->bio_inbed--; 1021 pbp->bio_children--; 1022 break; 1023 } 1024 } 1025 g_destroy_bio(bp); 1026 1027 switch (pbp->bio_cmd) { 1028 case BIO_READ: 1029 if (pbp->bio_inbed < pbp->bio_children) 1030 break; 1031 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 1032 g_io_deliver(pbp, pbp->bio_error); 1033 else { 1034 pbp->bio_error = 0; 1035 mtx_lock(&sc->sc_queue_mtx); 1036 TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue); 1037 mtx_unlock(&sc->sc_queue_mtx); 1038 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1039 wakeup(sc); 1040 } 1041 break; 1042 case BIO_DELETE: 1043 case BIO_WRITE: 1044 case BIO_FLUSH: 1045 if (pbp->bio_children == 0) { 1046 /* 1047 * All requests failed. 1048 */ 1049 } else if (pbp->bio_inbed < pbp->bio_children) { 1050 /* Do nothing. */ 1051 break; 1052 } else if (pbp->bio_children == pbp->bio_inbed) { 1053 /* Some requests succeeded. */ 1054 pbp->bio_error = 0; 1055 pbp->bio_completed = pbp->bio_length; 1056 } 1057 if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) { 1058 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1059 /* Release delayed sync requests if possible. */ 1060 g_mirror_sync_release(sc); 1061 } 1062 g_io_deliver(pbp, pbp->bio_error); 1063 break; 1064 default: 1065 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1066 break; 1067 } 1068 } 1069 1070 static void 1071 g_mirror_sync_done(struct bio *bp) 1072 { 1073 struct g_mirror_softc *sc; 1074 1075 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1076 sc = bp->bio_from->geom->softc; 1077 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1078 mtx_lock(&sc->sc_queue_mtx); 1079 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1080 mtx_unlock(&sc->sc_queue_mtx); 1081 wakeup(sc); 1082 } 1083 1084 static void 1085 g_mirror_candelete(struct bio *bp) 1086 { 1087 struct g_mirror_softc *sc; 1088 struct g_mirror_disk *disk; 1089 int val; 1090 1091 sc = bp->bio_to->private; 1092 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1093 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1094 break; 1095 } 1096 val = disk != NULL; 1097 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val)); 1098 } 1099 1100 static void 1101 g_mirror_kernel_dump(struct bio *bp) 1102 { 1103 struct g_mirror_softc *sc; 1104 struct g_mirror_disk *disk; 1105 struct bio *cbp; 1106 struct g_kerneldump *gkd; 1107 1108 /* 1109 * We configure dumping to the first component, because this component 1110 * will be used for reading with 'prefer' balance algorithm. 1111 * If the component with the highest priority is currently disconnected 1112 * we will not be able to read the dump after the reboot if it will be 1113 * connected and synchronized later. Can we do something better? 1114 */ 1115 sc = bp->bio_to->private; 1116 disk = LIST_FIRST(&sc->sc_disks); 1117 1118 gkd = (struct g_kerneldump *)bp->bio_data; 1119 if (gkd->length > bp->bio_to->mediasize) 1120 gkd->length = bp->bio_to->mediasize; 1121 cbp = g_clone_bio(bp); 1122 if (cbp == NULL) { 1123 g_io_deliver(bp, ENOMEM); 1124 return; 1125 } 1126 cbp->bio_done = g_std_done; 1127 g_io_request(cbp, disk->d_consumer); 1128 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1129 g_mirror_get_diskname(disk)); 1130 } 1131 1132 static void 1133 g_mirror_start(struct bio *bp) 1134 { 1135 struct g_mirror_softc *sc; 1136 1137 sc = bp->bio_to->private; 1138 /* 1139 * If sc == NULL or there are no valid disks, provider's error 1140 * should be set and g_mirror_start() should not be called at all. 1141 */ 1142 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1143 ("Provider's error should be set (error=%d)(mirror=%s).", 1144 bp->bio_to->error, bp->bio_to->name)); 1145 G_MIRROR_LOGREQ(3, bp, "Request received."); 1146 1147 switch (bp->bio_cmd) { 1148 case BIO_READ: 1149 case BIO_WRITE: 1150 case BIO_DELETE: 1151 case BIO_FLUSH: 1152 break; 1153 case BIO_GETATTR: 1154 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1155 g_mirror_candelete(bp); 1156 return; 1157 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1158 g_mirror_kernel_dump(bp); 1159 return; 1160 } 1161 /* FALLTHROUGH */ 1162 default: 1163 g_io_deliver(bp, EOPNOTSUPP); 1164 return; 1165 } 1166 mtx_lock(&sc->sc_queue_mtx); 1167 if (bp->bio_to->error != 0) { 1168 mtx_unlock(&sc->sc_queue_mtx); 1169 g_io_deliver(bp, bp->bio_to->error); 1170 return; 1171 } 1172 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1173 mtx_unlock(&sc->sc_queue_mtx); 1174 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1175 wakeup(sc); 1176 } 1177 1178 /* 1179 * Return TRUE if the given request is colliding with a in-progress 1180 * synchronization request. 1181 */ 1182 static bool 1183 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1184 { 1185 struct g_mirror_disk *disk; 1186 struct bio *sbp; 1187 off_t rstart, rend, sstart, send; 1188 u_int i; 1189 1190 if (sc->sc_sync.ds_ndisks == 0) 1191 return (false); 1192 rstart = bp->bio_offset; 1193 rend = bp->bio_offset + bp->bio_length; 1194 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1195 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1196 continue; 1197 for (i = 0; i < g_mirror_syncreqs; i++) { 1198 sbp = disk->d_sync.ds_bios[i]; 1199 if (sbp == NULL) 1200 continue; 1201 sstart = sbp->bio_offset; 1202 send = sbp->bio_offset + sbp->bio_length; 1203 if (rend > sstart && rstart < send) 1204 return (true); 1205 } 1206 } 1207 return (false); 1208 } 1209 1210 /* 1211 * Return TRUE if the given sync request is colliding with a in-progress regular 1212 * request. 1213 */ 1214 static bool 1215 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1216 { 1217 off_t rstart, rend, sstart, send; 1218 struct bio *bp; 1219 1220 if (sc->sc_sync.ds_ndisks == 0) 1221 return (false); 1222 sstart = sbp->bio_offset; 1223 send = sbp->bio_offset + sbp->bio_length; 1224 TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) { 1225 rstart = bp->bio_offset; 1226 rend = bp->bio_offset + bp->bio_length; 1227 if (rend > sstart && rstart < send) 1228 return (true); 1229 } 1230 return (false); 1231 } 1232 1233 /* 1234 * Puts regular request onto delayed queue. 1235 */ 1236 static void 1237 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1238 { 1239 1240 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1241 TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue); 1242 } 1243 1244 /* 1245 * Puts synchronization request onto delayed queue. 1246 */ 1247 static void 1248 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1249 { 1250 1251 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1252 TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue); 1253 } 1254 1255 /* 1256 * Requeue delayed regular requests. 1257 */ 1258 static void 1259 g_mirror_regular_release(struct g_mirror_softc *sc) 1260 { 1261 struct bio *bp; 1262 1263 if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL) 1264 return; 1265 if (g_mirror_sync_collision(sc, bp)) 1266 return; 1267 1268 G_MIRROR_DEBUG(2, "Requeuing regular requests after collision."); 1269 mtx_lock(&sc->sc_queue_mtx); 1270 TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue); 1271 TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue); 1272 mtx_unlock(&sc->sc_queue_mtx); 1273 } 1274 1275 /* 1276 * Releases delayed sync requests which don't collide anymore with regular 1277 * requests. 1278 */ 1279 static void 1280 g_mirror_sync_release(struct g_mirror_softc *sc) 1281 { 1282 struct bio *bp, *bp2; 1283 1284 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) { 1285 if (g_mirror_regular_collision(sc, bp)) 1286 continue; 1287 TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue); 1288 G_MIRROR_LOGREQ(2, bp, 1289 "Releasing delayed synchronization request."); 1290 g_io_request(bp, bp->bio_from); 1291 } 1292 } 1293 1294 /* 1295 * Free a synchronization request and clear its slot in the array. 1296 */ 1297 static void 1298 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) 1299 { 1300 int idx; 1301 1302 if (disk != NULL && disk->d_sync.ds_bios != NULL) { 1303 idx = (int)(uintptr_t)bp->bio_caller1; 1304 KASSERT(disk->d_sync.ds_bios[idx] == bp, 1305 ("unexpected sync BIO at %p:%d", disk, idx)); 1306 disk->d_sync.ds_bios[idx] = NULL; 1307 } 1308 free(bp->bio_data, M_MIRROR); 1309 g_destroy_bio(bp); 1310 } 1311 1312 /* 1313 * Handle synchronization requests. 1314 * Every synchronization request is a two-step process: first, a read request is 1315 * sent to the mirror provider via the sync consumer. If that request completes 1316 * successfully, it is converted to a write and sent to the disk being 1317 * synchronized. If the write also completes successfully, the synchronization 1318 * offset is advanced and a new read request is submitted. 1319 */ 1320 static void 1321 g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp) 1322 { 1323 struct g_mirror_disk *disk; 1324 struct g_mirror_disk_sync *sync; 1325 1326 KASSERT((bp->bio_cmd == BIO_READ && 1327 bp->bio_from->geom == sc->sc_sync.ds_geom) || 1328 (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom), 1329 ("Sync BIO %p with unexpected origin", bp)); 1330 1331 bp->bio_from->index--; 1332 disk = bp->bio_from->private; 1333 if (disk == NULL) { 1334 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1335 g_topology_lock(); 1336 g_mirror_kill_consumer(sc, bp->bio_from); 1337 g_topology_unlock(); 1338 g_mirror_sync_request_free(NULL, bp); 1339 sx_xlock(&sc->sc_lock); 1340 return; 1341 } 1342 1343 sync = &disk->d_sync; 1344 1345 /* 1346 * Synchronization request. 1347 */ 1348 switch (bp->bio_cmd) { 1349 case BIO_READ: { 1350 struct g_consumer *cp; 1351 1352 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, 1353 bp->bio_error); 1354 1355 if (bp->bio_error != 0) { 1356 G_MIRROR_LOGREQ(0, bp, 1357 "Synchronization request failed (error=%d).", 1358 bp->bio_error); 1359 1360 /* 1361 * The read error will trigger a syncid bump, so there's 1362 * no need to do that here. 1363 * 1364 * The read error handling for regular requests will 1365 * retry the read from all active mirrors before passing 1366 * the error back up, so there's no need to retry here. 1367 */ 1368 g_mirror_sync_request_free(disk, bp); 1369 g_mirror_event_send(disk, 1370 G_MIRROR_DISK_STATE_DISCONNECTED, 1371 G_MIRROR_EVENT_DONTWAIT); 1372 return; 1373 } 1374 G_MIRROR_LOGREQ(3, bp, 1375 "Synchronization request half-finished."); 1376 bp->bio_cmd = BIO_WRITE; 1377 bp->bio_cflags = 0; 1378 cp = disk->d_consumer; 1379 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1380 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1381 cp->acr, cp->acw, cp->ace)); 1382 cp->index++; 1383 g_io_request(bp, cp); 1384 return; 1385 } 1386 case BIO_WRITE: { 1387 off_t offset; 1388 int i; 1389 1390 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, 1391 bp->bio_error); 1392 1393 if (bp->bio_error != 0) { 1394 G_MIRROR_LOGREQ(0, bp, 1395 "Synchronization request failed (error=%d).", 1396 bp->bio_error); 1397 g_mirror_sync_request_free(disk, bp); 1398 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1399 g_mirror_event_send(disk, 1400 G_MIRROR_DISK_STATE_DISCONNECTED, 1401 G_MIRROR_EVENT_DONTWAIT); 1402 return; 1403 } 1404 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1405 if (sync->ds_offset >= sc->sc_mediasize || 1406 sync->ds_consumer == NULL || 1407 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1408 /* Don't send more synchronization requests. */ 1409 sync->ds_inflight--; 1410 g_mirror_sync_request_free(disk, bp); 1411 if (sync->ds_inflight > 0) 1412 return; 1413 if (sync->ds_consumer == NULL || 1414 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1415 return; 1416 } 1417 /* Disk up-to-date, activate it. */ 1418 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1419 G_MIRROR_EVENT_DONTWAIT); 1420 return; 1421 } 1422 1423 /* Send next synchronization request. */ 1424 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 1425 sync->ds_offset += bp->bio_length; 1426 1427 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1428 sync->ds_consumer->index++; 1429 1430 /* 1431 * Delay the request if it is colliding with a regular request. 1432 */ 1433 if (g_mirror_regular_collision(sc, bp)) 1434 g_mirror_sync_delay(sc, bp); 1435 else 1436 g_io_request(bp, sync->ds_consumer); 1437 1438 /* Requeue delayed requests if possible. */ 1439 g_mirror_regular_release(sc); 1440 1441 /* Find the smallest offset */ 1442 offset = sc->sc_mediasize; 1443 for (i = 0; i < g_mirror_syncreqs; i++) { 1444 bp = sync->ds_bios[i]; 1445 if (bp != NULL && bp->bio_offset < offset) 1446 offset = bp->bio_offset; 1447 } 1448 if (g_mirror_sync_period > 0 && 1449 time_uptime - sync->ds_update_ts > g_mirror_sync_period) { 1450 sync->ds_offset_done = offset; 1451 g_mirror_update_metadata(disk); 1452 sync->ds_update_ts = time_uptime; 1453 } 1454 return; 1455 } 1456 default: 1457 panic("Invalid I/O request %p", bp); 1458 } 1459 } 1460 1461 static void 1462 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1463 { 1464 struct g_mirror_disk *disk; 1465 struct g_consumer *cp; 1466 struct bio *cbp; 1467 1468 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1469 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1470 break; 1471 } 1472 if (disk == NULL) { 1473 if (bp->bio_error == 0) 1474 bp->bio_error = ENXIO; 1475 g_io_deliver(bp, bp->bio_error); 1476 return; 1477 } 1478 cbp = g_clone_bio(bp); 1479 if (cbp == NULL) { 1480 if (bp->bio_error == 0) 1481 bp->bio_error = ENOMEM; 1482 g_io_deliver(bp, bp->bio_error); 1483 return; 1484 } 1485 /* 1486 * Fill in the component buf structure. 1487 */ 1488 cp = disk->d_consumer; 1489 cbp->bio_done = g_mirror_done; 1490 cbp->bio_to = cp->provider; 1491 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1492 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1493 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1494 cp->acw, cp->ace)); 1495 cp->index++; 1496 g_io_request(cbp, cp); 1497 } 1498 1499 static void 1500 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1501 { 1502 struct g_mirror_disk *disk; 1503 struct g_consumer *cp; 1504 struct bio *cbp; 1505 1506 disk = g_mirror_get_disk(sc); 1507 if (disk == NULL) { 1508 if (bp->bio_error == 0) 1509 bp->bio_error = ENXIO; 1510 g_io_deliver(bp, bp->bio_error); 1511 return; 1512 } 1513 cbp = g_clone_bio(bp); 1514 if (cbp == NULL) { 1515 if (bp->bio_error == 0) 1516 bp->bio_error = ENOMEM; 1517 g_io_deliver(bp, bp->bio_error); 1518 return; 1519 } 1520 /* 1521 * Fill in the component buf structure. 1522 */ 1523 cp = disk->d_consumer; 1524 cbp->bio_done = g_mirror_done; 1525 cbp->bio_to = cp->provider; 1526 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1527 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1528 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1529 cp->acw, cp->ace)); 1530 cp->index++; 1531 g_io_request(cbp, cp); 1532 } 1533 1534 #define TRACK_SIZE (1 * 1024 * 1024) 1535 #define LOAD_SCALE 256 1536 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1537 1538 static void 1539 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1540 { 1541 struct g_mirror_disk *disk, *dp; 1542 struct g_consumer *cp; 1543 struct bio *cbp; 1544 int prio, best; 1545 1546 /* Find a disk with the smallest load. */ 1547 disk = NULL; 1548 best = INT_MAX; 1549 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1550 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1551 continue; 1552 prio = dp->load; 1553 /* If disk head is precisely in position - highly prefer it. */ 1554 if (dp->d_last_offset == bp->bio_offset) 1555 prio -= 2 * LOAD_SCALE; 1556 else 1557 /* If disk head is close to position - prefer it. */ 1558 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1559 prio -= 1 * LOAD_SCALE; 1560 if (prio <= best) { 1561 disk = dp; 1562 best = prio; 1563 } 1564 } 1565 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1566 cbp = g_clone_bio(bp); 1567 if (cbp == NULL) { 1568 if (bp->bio_error == 0) 1569 bp->bio_error = ENOMEM; 1570 g_io_deliver(bp, bp->bio_error); 1571 return; 1572 } 1573 /* 1574 * Fill in the component buf structure. 1575 */ 1576 cp = disk->d_consumer; 1577 cbp->bio_done = g_mirror_done; 1578 cbp->bio_to = cp->provider; 1579 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1580 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1581 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1582 cp->acw, cp->ace)); 1583 cp->index++; 1584 /* Remember last head position */ 1585 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1586 /* Update loads. */ 1587 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1588 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1589 dp->load * 7) / 8; 1590 } 1591 g_io_request(cbp, cp); 1592 } 1593 1594 static void 1595 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1596 { 1597 struct bio_queue queue; 1598 struct g_mirror_disk *disk; 1599 struct g_consumer *cp; 1600 struct bio *cbp; 1601 off_t left, mod, offset, slice; 1602 u_char *data; 1603 u_int ndisks; 1604 1605 if (bp->bio_length <= sc->sc_slice) { 1606 g_mirror_request_round_robin(sc, bp); 1607 return; 1608 } 1609 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1610 slice = bp->bio_length / ndisks; 1611 mod = slice % sc->sc_provider->sectorsize; 1612 if (mod != 0) 1613 slice += sc->sc_provider->sectorsize - mod; 1614 /* 1615 * Allocate all bios before sending any request, so we can 1616 * return ENOMEM in nice and clean way. 1617 */ 1618 left = bp->bio_length; 1619 offset = bp->bio_offset; 1620 data = bp->bio_data; 1621 TAILQ_INIT(&queue); 1622 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1623 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1624 continue; 1625 cbp = g_clone_bio(bp); 1626 if (cbp == NULL) { 1627 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1628 TAILQ_REMOVE(&queue, cbp, bio_queue); 1629 g_destroy_bio(cbp); 1630 } 1631 if (bp->bio_error == 0) 1632 bp->bio_error = ENOMEM; 1633 g_io_deliver(bp, bp->bio_error); 1634 return; 1635 } 1636 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1637 cbp->bio_done = g_mirror_done; 1638 cbp->bio_caller1 = disk; 1639 cbp->bio_to = disk->d_consumer->provider; 1640 cbp->bio_offset = offset; 1641 cbp->bio_data = data; 1642 cbp->bio_length = MIN(left, slice); 1643 left -= cbp->bio_length; 1644 if (left == 0) 1645 break; 1646 offset += cbp->bio_length; 1647 data += cbp->bio_length; 1648 } 1649 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1650 TAILQ_REMOVE(&queue, cbp, bio_queue); 1651 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1652 disk = cbp->bio_caller1; 1653 cbp->bio_caller1 = NULL; 1654 cp = disk->d_consumer; 1655 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1656 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1657 cp->acr, cp->acw, cp->ace)); 1658 disk->d_consumer->index++; 1659 g_io_request(cbp, disk->d_consumer); 1660 } 1661 } 1662 1663 static void 1664 g_mirror_register_request(struct g_mirror_softc *sc, struct bio *bp) 1665 { 1666 struct bio_queue queue; 1667 struct bio *cbp; 1668 struct g_consumer *cp; 1669 struct g_mirror_disk *disk; 1670 1671 sx_assert(&sc->sc_lock, SA_XLOCKED); 1672 1673 /* 1674 * To avoid ordering issues, if a write is deferred because of a 1675 * collision with a sync request, all I/O is deferred until that 1676 * write is initiated. 1677 */ 1678 if (bp->bio_from->geom != sc->sc_sync.ds_geom && 1679 !TAILQ_EMPTY(&sc->sc_regular_delayed)) { 1680 g_mirror_regular_delay(sc, bp); 1681 return; 1682 } 1683 1684 switch (bp->bio_cmd) { 1685 case BIO_READ: 1686 switch (sc->sc_balance) { 1687 case G_MIRROR_BALANCE_LOAD: 1688 g_mirror_request_load(sc, bp); 1689 break; 1690 case G_MIRROR_BALANCE_PREFER: 1691 g_mirror_request_prefer(sc, bp); 1692 break; 1693 case G_MIRROR_BALANCE_ROUND_ROBIN: 1694 g_mirror_request_round_robin(sc, bp); 1695 break; 1696 case G_MIRROR_BALANCE_SPLIT: 1697 g_mirror_request_split(sc, bp); 1698 break; 1699 } 1700 return; 1701 case BIO_WRITE: 1702 case BIO_DELETE: 1703 /* 1704 * Delay the request if it is colliding with a synchronization 1705 * request. 1706 */ 1707 if (g_mirror_sync_collision(sc, bp)) { 1708 g_mirror_regular_delay(sc, bp); 1709 return; 1710 } 1711 1712 if (sc->sc_idle) 1713 g_mirror_unidle(sc); 1714 else 1715 sc->sc_last_write = time_uptime; 1716 1717 /* 1718 * Bump syncid on first write. 1719 */ 1720 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1721 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1722 g_mirror_bump_syncid(sc); 1723 } 1724 1725 /* 1726 * Allocate all bios before sending any request, so we can 1727 * return ENOMEM in nice and clean way. 1728 */ 1729 TAILQ_INIT(&queue); 1730 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1731 switch (disk->d_state) { 1732 case G_MIRROR_DISK_STATE_ACTIVE: 1733 break; 1734 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1735 if (bp->bio_offset >= disk->d_sync.ds_offset) 1736 continue; 1737 break; 1738 default: 1739 continue; 1740 } 1741 if (bp->bio_cmd == BIO_DELETE && 1742 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1743 continue; 1744 cbp = g_clone_bio(bp); 1745 if (cbp == NULL) { 1746 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1747 TAILQ_REMOVE(&queue, cbp, bio_queue); 1748 g_destroy_bio(cbp); 1749 } 1750 if (bp->bio_error == 0) 1751 bp->bio_error = ENOMEM; 1752 g_io_deliver(bp, bp->bio_error); 1753 return; 1754 } 1755 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1756 cbp->bio_done = g_mirror_done; 1757 cp = disk->d_consumer; 1758 cbp->bio_caller1 = cp; 1759 cbp->bio_to = cp->provider; 1760 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1761 ("Consumer %s not opened (r%dw%de%d).", 1762 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1763 } 1764 if (TAILQ_EMPTY(&queue)) { 1765 KASSERT(bp->bio_cmd == BIO_DELETE, 1766 ("No consumers for regular request %p", bp)); 1767 g_io_deliver(bp, EOPNOTSUPP); 1768 return; 1769 } 1770 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1771 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1772 TAILQ_REMOVE(&queue, cbp, bio_queue); 1773 cp = cbp->bio_caller1; 1774 cbp->bio_caller1 = NULL; 1775 cp->index++; 1776 sc->sc_writes++; 1777 g_io_request(cbp, cp); 1778 } 1779 /* 1780 * Put request onto inflight queue, so we can check if new 1781 * synchronization requests don't collide with it. 1782 */ 1783 TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue); 1784 return; 1785 case BIO_FLUSH: 1786 TAILQ_INIT(&queue); 1787 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1788 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1789 continue; 1790 cbp = g_clone_bio(bp); 1791 if (cbp == NULL) { 1792 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1793 TAILQ_REMOVE(&queue, cbp, bio_queue); 1794 g_destroy_bio(cbp); 1795 } 1796 if (bp->bio_error == 0) 1797 bp->bio_error = ENOMEM; 1798 g_io_deliver(bp, bp->bio_error); 1799 return; 1800 } 1801 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1802 cbp->bio_done = g_mirror_done; 1803 cbp->bio_caller1 = disk; 1804 cbp->bio_to = disk->d_consumer->provider; 1805 } 1806 KASSERT(!TAILQ_EMPTY(&queue), 1807 ("No consumers for regular request %p", bp)); 1808 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1809 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1810 TAILQ_REMOVE(&queue, cbp, bio_queue); 1811 disk = cbp->bio_caller1; 1812 cbp->bio_caller1 = NULL; 1813 cp = disk->d_consumer; 1814 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1815 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1816 cp->acr, cp->acw, cp->ace)); 1817 cp->index++; 1818 g_io_request(cbp, cp); 1819 } 1820 break; 1821 default: 1822 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1823 bp->bio_cmd, sc->sc_name)); 1824 break; 1825 } 1826 } 1827 1828 static int 1829 g_mirror_can_destroy(struct g_mirror_softc *sc) 1830 { 1831 struct g_geom *gp; 1832 struct g_consumer *cp; 1833 1834 g_topology_assert(); 1835 gp = sc->sc_geom; 1836 if (gp->softc == NULL) 1837 return (1); 1838 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1839 return (0); 1840 LIST_FOREACH(cp, &gp->consumer, consumer) { 1841 if (g_mirror_is_busy(sc, cp)) 1842 return (0); 1843 } 1844 gp = sc->sc_sync.ds_geom; 1845 LIST_FOREACH(cp, &gp->consumer, consumer) { 1846 if (g_mirror_is_busy(sc, cp)) 1847 return (0); 1848 } 1849 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1850 sc->sc_name); 1851 return (1); 1852 } 1853 1854 static int 1855 g_mirror_try_destroy(struct g_mirror_softc *sc) 1856 { 1857 1858 if (sc->sc_rootmount != NULL) { 1859 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1860 sc->sc_rootmount); 1861 root_mount_rel(sc->sc_rootmount); 1862 sc->sc_rootmount = NULL; 1863 } 1864 g_topology_lock(); 1865 if (!g_mirror_can_destroy(sc)) { 1866 g_topology_unlock(); 1867 return (0); 1868 } 1869 sc->sc_geom->softc = NULL; 1870 sc->sc_sync.ds_geom->softc = NULL; 1871 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) { 1872 g_topology_unlock(); 1873 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1874 &sc->sc_worker); 1875 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1876 sx_xunlock(&sc->sc_lock); 1877 wakeup(&sc->sc_worker); 1878 sc->sc_worker = NULL; 1879 } else { 1880 g_topology_unlock(); 1881 g_mirror_destroy_device(sc); 1882 } 1883 return (1); 1884 } 1885 1886 /* 1887 * Worker thread. 1888 */ 1889 static void 1890 g_mirror_worker(void *arg) 1891 { 1892 struct g_mirror_softc *sc; 1893 struct g_mirror_event *ep; 1894 struct bio *bp; 1895 int timeout; 1896 1897 sc = arg; 1898 thread_lock(curthread); 1899 sched_prio(curthread, PRIBIO); 1900 thread_unlock(curthread); 1901 1902 sx_xlock(&sc->sc_lock); 1903 for (;;) { 1904 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1905 /* 1906 * First take a look at events. 1907 * This is important to handle events before any I/O requests. 1908 */ 1909 ep = g_mirror_event_first(sc); 1910 if (ep != NULL) { 1911 g_mirror_event_remove(sc, ep); 1912 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1913 /* Update only device status. */ 1914 G_MIRROR_DEBUG(3, 1915 "Running event for device %s.", 1916 sc->sc_name); 1917 ep->e_error = 0; 1918 g_mirror_update_device(sc, true); 1919 } else { 1920 /* Update disk status. */ 1921 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1922 g_mirror_get_diskname(ep->e_disk)); 1923 ep->e_error = g_mirror_update_disk(ep->e_disk, 1924 ep->e_state); 1925 if (ep->e_error == 0) 1926 g_mirror_update_device(sc, false); 1927 } 1928 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1929 KASSERT(ep->e_error == 0, 1930 ("Error cannot be handled.")); 1931 g_mirror_event_free(ep); 1932 } else { 1933 ep->e_flags |= G_MIRROR_EVENT_DONE; 1934 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1935 ep); 1936 mtx_lock(&sc->sc_events_mtx); 1937 wakeup(ep); 1938 mtx_unlock(&sc->sc_events_mtx); 1939 } 1940 if ((sc->sc_flags & 1941 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1942 if (g_mirror_try_destroy(sc)) { 1943 curthread->td_pflags &= ~TDP_GEOM; 1944 G_MIRROR_DEBUG(1, "Thread exiting."); 1945 kproc_exit(0); 1946 } 1947 } 1948 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1949 continue; 1950 } 1951 1952 /* 1953 * Check if we can mark array as CLEAN and if we can't take 1954 * how much seconds should we wait. 1955 */ 1956 timeout = g_mirror_idle(sc, -1); 1957 1958 /* 1959 * Handle I/O requests. 1960 */ 1961 mtx_lock(&sc->sc_queue_mtx); 1962 bp = TAILQ_FIRST(&sc->sc_queue); 1963 if (bp != NULL) 1964 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 1965 else { 1966 if ((sc->sc_flags & 1967 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1968 mtx_unlock(&sc->sc_queue_mtx); 1969 if (g_mirror_try_destroy(sc)) { 1970 curthread->td_pflags &= ~TDP_GEOM; 1971 G_MIRROR_DEBUG(1, "Thread exiting."); 1972 kproc_exit(0); 1973 } 1974 mtx_lock(&sc->sc_queue_mtx); 1975 if (!TAILQ_EMPTY(&sc->sc_queue)) { 1976 mtx_unlock(&sc->sc_queue_mtx); 1977 continue; 1978 } 1979 } 1980 if (g_mirror_event_first(sc) != NULL) { 1981 mtx_unlock(&sc->sc_queue_mtx); 1982 continue; 1983 } 1984 sx_xunlock(&sc->sc_lock); 1985 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1986 timeout * hz); 1987 sx_xlock(&sc->sc_lock); 1988 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1989 continue; 1990 } 1991 mtx_unlock(&sc->sc_queue_mtx); 1992 1993 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1994 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1995 /* 1996 * Handle completion of the first half (the read) of a 1997 * block synchronization operation. 1998 */ 1999 g_mirror_sync_request(sc, bp); 2000 } else if (bp->bio_to != sc->sc_provider) { 2001 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 2002 /* 2003 * Handle completion of a regular I/O request. 2004 */ 2005 g_mirror_regular_request(sc, bp); 2006 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2007 /* 2008 * Handle completion of the second half (the 2009 * write) of a block synchronization operation. 2010 */ 2011 g_mirror_sync_request(sc, bp); 2012 else { 2013 KASSERT(0, 2014 ("Invalid request cflags=0x%hx to=%s.", 2015 bp->bio_cflags, bp->bio_to->name)); 2016 } 2017 } else { 2018 /* 2019 * Initiate an I/O request. 2020 */ 2021 g_mirror_register_request(sc, bp); 2022 } 2023 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 2024 } 2025 } 2026 2027 static void 2028 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 2029 { 2030 2031 sx_assert(&sc->sc_lock, SX_LOCKED); 2032 2033 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 2034 return; 2035 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2036 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 2037 g_mirror_get_diskname(disk), sc->sc_name); 2038 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2039 } else if (sc->sc_idle && 2040 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2041 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 2042 g_mirror_get_diskname(disk), sc->sc_name); 2043 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2044 } 2045 } 2046 2047 static void 2048 g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp, 2049 off_t offset) 2050 { 2051 void *data; 2052 int idx; 2053 2054 data = bp->bio_data; 2055 idx = (int)(uintptr_t)bp->bio_caller1; 2056 g_reset_bio(bp); 2057 2058 bp->bio_cmd = BIO_READ; 2059 bp->bio_data = data; 2060 bp->bio_done = g_mirror_sync_done; 2061 bp->bio_from = disk->d_sync.ds_consumer; 2062 bp->bio_to = disk->d_softc->sc_provider; 2063 bp->bio_caller1 = (void *)(uintptr_t)idx; 2064 bp->bio_offset = offset; 2065 bp->bio_length = MIN(MAXPHYS, 2066 disk->d_softc->sc_mediasize - bp->bio_offset); 2067 } 2068 2069 static void 2070 g_mirror_sync_start(struct g_mirror_disk *disk) 2071 { 2072 struct g_mirror_softc *sc; 2073 struct g_mirror_disk_sync *sync; 2074 struct g_consumer *cp; 2075 struct bio *bp; 2076 int error, i; 2077 2078 g_topology_assert_not(); 2079 sc = disk->d_softc; 2080 sync = &disk->d_sync; 2081 sx_assert(&sc->sc_lock, SX_LOCKED); 2082 2083 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2084 ("Disk %s is not marked for synchronization.", 2085 g_mirror_get_diskname(disk))); 2086 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2087 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 2088 sc->sc_state)); 2089 2090 sx_xunlock(&sc->sc_lock); 2091 g_topology_lock(); 2092 cp = g_new_consumer(sc->sc_sync.ds_geom); 2093 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2094 error = g_attach(cp, sc->sc_provider); 2095 KASSERT(error == 0, 2096 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 2097 error = g_access(cp, 1, 0, 0); 2098 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 2099 g_topology_unlock(); 2100 sx_xlock(&sc->sc_lock); 2101 2102 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2103 g_mirror_get_diskname(disk)); 2104 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2105 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2106 KASSERT(sync->ds_consumer == NULL, 2107 ("Sync consumer already exists (device=%s, disk=%s).", 2108 sc->sc_name, g_mirror_get_diskname(disk))); 2109 2110 sync->ds_consumer = cp; 2111 sync->ds_consumer->private = disk; 2112 sync->ds_consumer->index = 0; 2113 2114 /* 2115 * Allocate memory for synchronization bios and initialize them. 2116 */ 2117 sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2118 M_MIRROR, M_WAITOK); 2119 for (i = 0; i < g_mirror_syncreqs; i++) { 2120 bp = g_alloc_bio(); 2121 sync->ds_bios[i] = bp; 2122 2123 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 2124 bp->bio_caller1 = (void *)(uintptr_t)i; 2125 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 2126 sync->ds_offset += bp->bio_length; 2127 } 2128 2129 /* Increase the number of disks in SYNCHRONIZING state. */ 2130 sc->sc_sync.ds_ndisks++; 2131 /* Set the number of in-flight synchronization requests. */ 2132 sync->ds_inflight = g_mirror_syncreqs; 2133 2134 /* 2135 * Fire off first synchronization requests. 2136 */ 2137 for (i = 0; i < g_mirror_syncreqs; i++) { 2138 bp = sync->ds_bios[i]; 2139 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2140 sync->ds_consumer->index++; 2141 /* 2142 * Delay the request if it is colliding with a regular request. 2143 */ 2144 if (g_mirror_regular_collision(sc, bp)) 2145 g_mirror_sync_delay(sc, bp); 2146 else 2147 g_io_request(bp, sync->ds_consumer); 2148 } 2149 } 2150 2151 /* 2152 * Stop synchronization process. 2153 * type: 0 - synchronization finished 2154 * 1 - synchronization stopped 2155 */ 2156 static void 2157 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2158 { 2159 struct g_mirror_softc *sc; 2160 struct g_consumer *cp; 2161 2162 g_topology_assert_not(); 2163 sc = disk->d_softc; 2164 sx_assert(&sc->sc_lock, SX_LOCKED); 2165 2166 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2167 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2168 g_mirror_disk_state2str(disk->d_state))); 2169 if (disk->d_sync.ds_consumer == NULL) 2170 return; 2171 2172 if (type == 0) { 2173 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2174 sc->sc_name, g_mirror_get_diskname(disk)); 2175 } else /* if (type == 1) */ { 2176 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2177 sc->sc_name, g_mirror_get_diskname(disk)); 2178 } 2179 g_mirror_regular_release(sc); 2180 free(disk->d_sync.ds_bios, M_MIRROR); 2181 disk->d_sync.ds_bios = NULL; 2182 cp = disk->d_sync.ds_consumer; 2183 disk->d_sync.ds_consumer = NULL; 2184 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2185 sc->sc_sync.ds_ndisks--; 2186 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2187 g_topology_lock(); 2188 g_mirror_kill_consumer(sc, cp); 2189 g_topology_unlock(); 2190 sx_xlock(&sc->sc_lock); 2191 } 2192 2193 static void 2194 g_mirror_launch_provider(struct g_mirror_softc *sc) 2195 { 2196 struct g_mirror_disk *disk; 2197 struct g_provider *pp, *dp; 2198 2199 sx_assert(&sc->sc_lock, SX_LOCKED); 2200 2201 g_topology_lock(); 2202 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2203 pp->flags |= G_PF_DIRECT_RECEIVE; 2204 pp->mediasize = sc->sc_mediasize; 2205 pp->sectorsize = sc->sc_sectorsize; 2206 pp->stripesize = 0; 2207 pp->stripeoffset = 0; 2208 2209 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2210 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2211 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2212 2213 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2214 if (disk->d_consumer && disk->d_consumer->provider) { 2215 dp = disk->d_consumer->provider; 2216 if (dp->stripesize > pp->stripesize) { 2217 pp->stripesize = dp->stripesize; 2218 pp->stripeoffset = dp->stripeoffset; 2219 } 2220 /* A provider underneath us doesn't support unmapped */ 2221 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2222 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2223 "because of %s.", dp->name); 2224 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2225 } 2226 } 2227 } 2228 pp->private = sc; 2229 sc->sc_refcnt++; 2230 sc->sc_provider = pp; 2231 g_error_provider(pp, 0); 2232 g_topology_unlock(); 2233 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2234 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2235 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2236 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2237 g_mirror_sync_start(disk); 2238 } 2239 } 2240 2241 static void 2242 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2243 { 2244 struct g_mirror_disk *disk; 2245 struct bio *bp; 2246 2247 g_topology_assert_not(); 2248 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2249 sc->sc_name)); 2250 2251 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2252 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2253 g_mirror_sync_stop(disk, 1); 2254 } 2255 2256 g_topology_lock(); 2257 g_error_provider(sc->sc_provider, ENXIO); 2258 mtx_lock(&sc->sc_queue_mtx); 2259 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 2260 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 2261 /* 2262 * Abort any pending I/O that wasn't generated by us. 2263 * Synchronization requests and requests destined for individual 2264 * mirror components can be destroyed immediately. 2265 */ 2266 if (bp->bio_to == sc->sc_provider && 2267 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2268 g_io_deliver(bp, ENXIO); 2269 } else { 2270 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2271 free(bp->bio_data, M_MIRROR); 2272 g_destroy_bio(bp); 2273 } 2274 } 2275 mtx_unlock(&sc->sc_queue_mtx); 2276 g_wither_provider(sc->sc_provider, ENXIO); 2277 sc->sc_provider = NULL; 2278 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2279 g_topology_unlock(); 2280 } 2281 2282 static void 2283 g_mirror_go(void *arg) 2284 { 2285 struct g_mirror_softc *sc; 2286 2287 sc = arg; 2288 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2289 g_mirror_event_send(sc, 0, 2290 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2291 } 2292 2293 static u_int 2294 g_mirror_determine_state(struct g_mirror_disk *disk) 2295 { 2296 struct g_mirror_softc *sc; 2297 u_int state; 2298 2299 sc = disk->d_softc; 2300 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2301 if ((disk->d_flags & 2302 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 && 2303 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || 2304 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { 2305 /* Disk does not need synchronization. */ 2306 state = G_MIRROR_DISK_STATE_ACTIVE; 2307 } else { 2308 if ((sc->sc_flags & 2309 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2310 (disk->d_flags & 2311 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2312 /* 2313 * We can start synchronization from 2314 * the stored offset. 2315 */ 2316 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2317 } else { 2318 state = G_MIRROR_DISK_STATE_STALE; 2319 } 2320 } 2321 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2322 /* 2323 * Reset all synchronization data for this disk, 2324 * because if it even was synchronized, it was 2325 * synchronized to disks with different syncid. 2326 */ 2327 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2328 disk->d_sync.ds_offset = 0; 2329 disk->d_sync.ds_offset_done = 0; 2330 disk->d_sync.ds_syncid = sc->sc_syncid; 2331 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2332 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2333 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2334 } else { 2335 state = G_MIRROR_DISK_STATE_STALE; 2336 } 2337 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2338 /* 2339 * Not good, NOT GOOD! 2340 * It means that mirror was started on stale disks 2341 * and more fresh disk just arrive. 2342 * If there were writes, mirror is broken, sorry. 2343 * I think the best choice here is don't touch 2344 * this disk and inform the user loudly. 2345 */ 2346 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2347 "disk (%s) arrives!! It will not be connected to the " 2348 "running device.", sc->sc_name, 2349 g_mirror_get_diskname(disk)); 2350 g_mirror_destroy_disk(disk); 2351 state = G_MIRROR_DISK_STATE_NONE; 2352 /* Return immediately, because disk was destroyed. */ 2353 return (state); 2354 } 2355 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2356 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2357 return (state); 2358 } 2359 2360 /* 2361 * Update device state. 2362 */ 2363 static void 2364 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2365 { 2366 struct g_mirror_disk *disk; 2367 u_int state; 2368 2369 sx_assert(&sc->sc_lock, SX_XLOCKED); 2370 2371 switch (sc->sc_state) { 2372 case G_MIRROR_DEVICE_STATE_STARTING: 2373 { 2374 struct g_mirror_disk *pdisk, *tdisk; 2375 const char *mismatch; 2376 uintmax_t found, newest; 2377 u_int dirty, ndisks; 2378 2379 /* Pre-flight checks */ 2380 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2381 /* 2382 * Confirm we already detected the newest genid. 2383 */ 2384 KASSERT(sc->sc_genid >= disk->d_genid, 2385 ("%s: found newer genid %u (sc:%p had %u).", __func__, 2386 disk->d_genid, sc, sc->sc_genid)); 2387 2388 /* Kick out any previously tasted stale components. */ 2389 if (disk->d_genid < sc->sc_genid) { 2390 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " 2391 "(device %s) (component=%u latest=%u), skipping.", 2392 g_mirror_get_diskname(disk), sc->sc_name, 2393 disk->d_genid, sc->sc_genid); 2394 g_mirror_destroy_disk(disk); 2395 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2396 continue; 2397 } 2398 2399 /* 2400 * Confirm we already detected the newest syncid. 2401 */ 2402 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, 2403 ("%s: found newer syncid %u (sc:%p had %u).", 2404 __func__, disk->d_sync.ds_syncid, sc, 2405 sc->sc_syncid)); 2406 2407 #define DETECT_MISMATCH(field, name) \ 2408 if (mismatch == NULL && \ 2409 disk->d_init_ ## field != sc->sc_ ## field) { \ 2410 mismatch = name; \ 2411 found = (intmax_t)disk->d_init_ ## field; \ 2412 newest = (intmax_t)sc->sc_ ## field; \ 2413 } 2414 mismatch = NULL; 2415 DETECT_MISMATCH(ndisks, "md_all"); 2416 DETECT_MISMATCH(balance, "md_balance"); 2417 DETECT_MISMATCH(slice, "md_slice"); 2418 DETECT_MISMATCH(mediasize, "md_mediasize"); 2419 #undef DETECT_MISMATCH 2420 if (mismatch != NULL) { 2421 G_MIRROR_DEBUG(0, "Found a mismatching '%s' " 2422 "field on %s (device %s) (found=%ju " 2423 "newest=%ju).", mismatch, 2424 g_mirror_get_diskname(disk), sc->sc_name, 2425 found, newest); 2426 g_mirror_destroy_disk(disk); 2427 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2428 continue; 2429 } 2430 } 2431 2432 KASSERT(sc->sc_provider == NULL, 2433 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2434 /* 2435 * Are we ready? If the timeout (force is true) has expired, and 2436 * any disks are present, then yes. If we're permitted to launch 2437 * before the timeout has expired and the expected number of 2438 * current-generation mirror disks have been tasted, then yes. 2439 */ 2440 ndisks = g_mirror_ndisks(sc, -1); 2441 if ((force && ndisks > 0) || 2442 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { 2443 ; 2444 } else if (ndisks == 0) { 2445 /* 2446 * Disks went down in starting phase, so destroy 2447 * device. 2448 */ 2449 callout_drain(&sc->sc_callout); 2450 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2451 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2452 sc->sc_rootmount); 2453 root_mount_rel(sc->sc_rootmount); 2454 sc->sc_rootmount = NULL; 2455 return; 2456 } else { 2457 return; 2458 } 2459 2460 /* 2461 * Activate all disks with the biggest syncid. 2462 */ 2463 if (force) { 2464 /* 2465 * If 'force' is true, we have been called due to 2466 * timeout, so don't bother canceling timeout. 2467 */ 2468 ndisks = 0; 2469 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2470 if ((disk->d_flags & 2471 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2472 ndisks++; 2473 } 2474 } 2475 if (ndisks == 0) { 2476 /* No valid disks found, destroy device. */ 2477 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2478 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2479 __LINE__, sc->sc_rootmount); 2480 root_mount_rel(sc->sc_rootmount); 2481 sc->sc_rootmount = NULL; 2482 return; 2483 } 2484 } else { 2485 /* Cancel timeout. */ 2486 callout_drain(&sc->sc_callout); 2487 } 2488 2489 /* 2490 * Here we need to look for dirty disks and if all disks 2491 * with the biggest syncid are dirty, we have to choose 2492 * one with the biggest priority and rebuild the rest. 2493 */ 2494 /* 2495 * Find the number of dirty disks with the biggest syncid. 2496 * Find the number of disks with the biggest syncid. 2497 * While here, find a disk with the biggest priority. 2498 */ 2499 dirty = ndisks = 0; 2500 pdisk = NULL; 2501 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2502 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2503 continue; 2504 if ((disk->d_flags & 2505 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2506 continue; 2507 } 2508 ndisks++; 2509 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2510 dirty++; 2511 if (pdisk == NULL || 2512 pdisk->d_priority < disk->d_priority) { 2513 pdisk = disk; 2514 } 2515 } 2516 } 2517 if (dirty == 0) { 2518 /* No dirty disks at all, great. */ 2519 } else if (dirty == ndisks) { 2520 /* 2521 * Force synchronization for all dirty disks except one 2522 * with the biggest priority. 2523 */ 2524 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2525 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2526 "master disk for synchronization.", 2527 g_mirror_get_diskname(pdisk), sc->sc_name); 2528 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2529 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2530 continue; 2531 if ((disk->d_flags & 2532 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2533 continue; 2534 } 2535 KASSERT((disk->d_flags & 2536 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2537 ("Disk %s isn't marked as dirty.", 2538 g_mirror_get_diskname(disk))); 2539 /* Skip the disk with the biggest priority. */ 2540 if (disk == pdisk) 2541 continue; 2542 disk->d_sync.ds_syncid = 0; 2543 } 2544 } else if (dirty < ndisks) { 2545 /* 2546 * Force synchronization for all dirty disks. 2547 * We have some non-dirty disks. 2548 */ 2549 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2550 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2551 continue; 2552 if ((disk->d_flags & 2553 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2554 continue; 2555 } 2556 if ((disk->d_flags & 2557 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2558 continue; 2559 } 2560 disk->d_sync.ds_syncid = 0; 2561 } 2562 } 2563 2564 /* Reset hint. */ 2565 sc->sc_hint = NULL; 2566 if (force) { 2567 /* Remember to bump syncid on first write. */ 2568 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2569 } 2570 state = G_MIRROR_DEVICE_STATE_RUNNING; 2571 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2572 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2573 g_mirror_device_state2str(state)); 2574 sc->sc_state = state; 2575 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2576 state = g_mirror_determine_state(disk); 2577 g_mirror_event_send(disk, state, 2578 G_MIRROR_EVENT_DONTWAIT); 2579 if (state == G_MIRROR_DISK_STATE_STALE) 2580 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2581 } 2582 break; 2583 } 2584 case G_MIRROR_DEVICE_STATE_RUNNING: 2585 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2586 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2587 /* 2588 * No usable disks, so destroy the device. 2589 */ 2590 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2591 break; 2592 } else if (g_mirror_ndisks(sc, 2593 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2594 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2595 /* 2596 * We have active disks, launch provider if it doesn't 2597 * exist. 2598 */ 2599 if (sc->sc_provider == NULL) 2600 g_mirror_launch_provider(sc); 2601 if (sc->sc_rootmount != NULL) { 2602 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2603 __LINE__, sc->sc_rootmount); 2604 root_mount_rel(sc->sc_rootmount); 2605 sc->sc_rootmount = NULL; 2606 } 2607 } 2608 /* 2609 * Genid should be bumped immediately, so do it here. 2610 */ 2611 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2612 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2613 g_mirror_bump_genid(sc); 2614 } 2615 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2616 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2617 g_mirror_bump_syncid(sc); 2618 } 2619 break; 2620 default: 2621 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2622 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2623 break; 2624 } 2625 } 2626 2627 /* 2628 * Update disk state and device state if needed. 2629 */ 2630 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2631 "Disk %s state changed from %s to %s (device %s).", \ 2632 g_mirror_get_diskname(disk), \ 2633 g_mirror_disk_state2str(disk->d_state), \ 2634 g_mirror_disk_state2str(state), sc->sc_name) 2635 static int 2636 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2637 { 2638 struct g_mirror_softc *sc; 2639 2640 sc = disk->d_softc; 2641 sx_assert(&sc->sc_lock, SX_XLOCKED); 2642 2643 again: 2644 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2645 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2646 g_mirror_disk_state2str(state)); 2647 switch (state) { 2648 case G_MIRROR_DISK_STATE_NEW: 2649 /* 2650 * Possible scenarios: 2651 * 1. New disk arrive. 2652 */ 2653 /* Previous state should be NONE. */ 2654 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2655 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2656 g_mirror_disk_state2str(disk->d_state))); 2657 DISK_STATE_CHANGED(); 2658 2659 disk->d_state = state; 2660 g_topology_lock(); 2661 if (LIST_EMPTY(&sc->sc_disks)) 2662 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2663 else { 2664 struct g_mirror_disk *dp; 2665 2666 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2667 if (disk->d_priority >= dp->d_priority) { 2668 LIST_INSERT_BEFORE(dp, disk, d_next); 2669 dp = NULL; 2670 break; 2671 } 2672 if (LIST_NEXT(dp, d_next) == NULL) 2673 break; 2674 } 2675 if (dp != NULL) 2676 LIST_INSERT_AFTER(dp, disk, d_next); 2677 } 2678 g_topology_unlock(); 2679 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2680 sc->sc_name, g_mirror_get_diskname(disk)); 2681 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2682 break; 2683 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2684 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2685 g_mirror_device_state2str(sc->sc_state), 2686 g_mirror_get_diskname(disk), 2687 g_mirror_disk_state2str(disk->d_state))); 2688 state = g_mirror_determine_state(disk); 2689 if (state != G_MIRROR_DISK_STATE_NONE) 2690 goto again; 2691 break; 2692 case G_MIRROR_DISK_STATE_ACTIVE: 2693 /* 2694 * Possible scenarios: 2695 * 1. New disk does not need synchronization. 2696 * 2. Synchronization process finished successfully. 2697 */ 2698 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2699 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2700 g_mirror_device_state2str(sc->sc_state), 2701 g_mirror_get_diskname(disk), 2702 g_mirror_disk_state2str(disk->d_state))); 2703 /* Previous state should be NEW or SYNCHRONIZING. */ 2704 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2705 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2706 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2707 g_mirror_disk_state2str(disk->d_state))); 2708 DISK_STATE_CHANGED(); 2709 2710 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2711 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2712 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2713 g_mirror_sync_stop(disk, 0); 2714 } 2715 disk->d_state = state; 2716 disk->d_sync.ds_offset = 0; 2717 disk->d_sync.ds_offset_done = 0; 2718 g_mirror_update_idle(sc, disk); 2719 g_mirror_update_metadata(disk); 2720 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2721 sc->sc_name, g_mirror_get_diskname(disk)); 2722 break; 2723 case G_MIRROR_DISK_STATE_STALE: 2724 /* 2725 * Possible scenarios: 2726 * 1. Stale disk was connected. 2727 */ 2728 /* Previous state should be NEW. */ 2729 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2730 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2731 g_mirror_disk_state2str(disk->d_state))); 2732 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2733 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2734 g_mirror_device_state2str(sc->sc_state), 2735 g_mirror_get_diskname(disk), 2736 g_mirror_disk_state2str(disk->d_state))); 2737 /* 2738 * STALE state is only possible if device is marked 2739 * NOAUTOSYNC. 2740 */ 2741 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2742 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2743 g_mirror_device_state2str(sc->sc_state), 2744 g_mirror_get_diskname(disk), 2745 g_mirror_disk_state2str(disk->d_state))); 2746 DISK_STATE_CHANGED(); 2747 2748 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2749 disk->d_state = state; 2750 g_mirror_update_metadata(disk); 2751 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2752 sc->sc_name, g_mirror_get_diskname(disk)); 2753 break; 2754 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2755 /* 2756 * Possible scenarios: 2757 * 1. Disk which needs synchronization was connected. 2758 */ 2759 /* Previous state should be NEW. */ 2760 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2761 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2762 g_mirror_disk_state2str(disk->d_state))); 2763 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2764 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2765 g_mirror_device_state2str(sc->sc_state), 2766 g_mirror_get_diskname(disk), 2767 g_mirror_disk_state2str(disk->d_state))); 2768 DISK_STATE_CHANGED(); 2769 2770 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2771 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2772 disk->d_state = state; 2773 if (sc->sc_provider != NULL) { 2774 g_mirror_sync_start(disk); 2775 g_mirror_update_metadata(disk); 2776 } 2777 break; 2778 case G_MIRROR_DISK_STATE_DISCONNECTED: 2779 /* 2780 * Possible scenarios: 2781 * 1. Device wasn't running yet, but disk disappear. 2782 * 2. Disk was active and disapppear. 2783 * 3. Disk disappear during synchronization process. 2784 */ 2785 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2786 /* 2787 * Previous state should be ACTIVE, STALE or 2788 * SYNCHRONIZING. 2789 */ 2790 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2791 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2792 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2793 ("Wrong disk state (%s, %s).", 2794 g_mirror_get_diskname(disk), 2795 g_mirror_disk_state2str(disk->d_state))); 2796 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2797 /* Previous state should be NEW. */ 2798 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2799 ("Wrong disk state (%s, %s).", 2800 g_mirror_get_diskname(disk), 2801 g_mirror_disk_state2str(disk->d_state))); 2802 /* 2803 * Reset bumping syncid if disk disappeared in STARTING 2804 * state. 2805 */ 2806 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2807 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2808 #ifdef INVARIANTS 2809 } else { 2810 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2811 sc->sc_name, 2812 g_mirror_device_state2str(sc->sc_state), 2813 g_mirror_get_diskname(disk), 2814 g_mirror_disk_state2str(disk->d_state))); 2815 #endif 2816 } 2817 DISK_STATE_CHANGED(); 2818 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2819 sc->sc_name, g_mirror_get_diskname(disk)); 2820 2821 g_mirror_destroy_disk(disk); 2822 break; 2823 case G_MIRROR_DISK_STATE_DESTROY: 2824 { 2825 int error; 2826 2827 error = g_mirror_clear_metadata(disk); 2828 if (error != 0) { 2829 G_MIRROR_DEBUG(0, 2830 "Device %s: failed to clear metadata on %s: %d.", 2831 sc->sc_name, g_mirror_get_diskname(disk), error); 2832 break; 2833 } 2834 DISK_STATE_CHANGED(); 2835 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2836 sc->sc_name, g_mirror_get_diskname(disk)); 2837 2838 g_mirror_destroy_disk(disk); 2839 sc->sc_ndisks--; 2840 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2841 g_mirror_update_metadata(disk); 2842 } 2843 break; 2844 } 2845 default: 2846 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2847 break; 2848 } 2849 return (0); 2850 } 2851 #undef DISK_STATE_CHANGED 2852 2853 int 2854 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2855 { 2856 struct g_provider *pp; 2857 u_char *buf; 2858 int error; 2859 2860 g_topology_assert(); 2861 2862 error = g_access(cp, 1, 0, 0); 2863 if (error != 0) 2864 return (error); 2865 pp = cp->provider; 2866 g_topology_unlock(); 2867 /* Metadata are stored on last sector. */ 2868 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2869 &error); 2870 g_topology_lock(); 2871 g_access(cp, -1, 0, 0); 2872 if (buf == NULL) { 2873 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2874 cp->provider->name, error); 2875 return (error); 2876 } 2877 2878 /* Decode metadata. */ 2879 error = mirror_metadata_decode(buf, md); 2880 g_free(buf); 2881 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2882 return (EINVAL); 2883 if (md->md_version > G_MIRROR_VERSION) { 2884 G_MIRROR_DEBUG(0, 2885 "Kernel module is too old to handle metadata from %s.", 2886 cp->provider->name); 2887 return (EINVAL); 2888 } 2889 if (error != 0) { 2890 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2891 cp->provider->name); 2892 return (error); 2893 } 2894 2895 return (0); 2896 } 2897 2898 static int 2899 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2900 struct g_mirror_metadata *md) 2901 { 2902 2903 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " 2904 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " 2905 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " 2906 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " 2907 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " 2908 "sc_state 0x%x.", 2909 __func__, md->md_did, pp->name, sc->sc_name, md->md_all, 2910 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, 2911 sc->sc_balance, (uintmax_t)sc->sc_mediasize, 2912 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, 2913 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, 2914 md->md_genid, md->md_priority, sc->sc_state); 2915 2916 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2917 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2918 pp->name, md->md_did); 2919 return (EEXIST); 2920 } 2921 if (sc->sc_mediasize > pp->mediasize) { 2922 G_MIRROR_DEBUG(1, 2923 "Invalid size of disk %s (device %s), skipping.", pp->name, 2924 sc->sc_name); 2925 return (EINVAL); 2926 } 2927 if (md->md_sectorsize != sc->sc_sectorsize) { 2928 G_MIRROR_DEBUG(1, 2929 "Invalid '%s' field on disk %s (device %s), skipping.", 2930 "md_sectorsize", pp->name, sc->sc_name); 2931 return (EINVAL); 2932 } 2933 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2934 G_MIRROR_DEBUG(1, 2935 "Invalid sector size of disk %s (device %s), skipping.", 2936 pp->name, sc->sc_name); 2937 return (EINVAL); 2938 } 2939 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2940 G_MIRROR_DEBUG(1, 2941 "Invalid device flags on disk %s (device %s), skipping.", 2942 pp->name, sc->sc_name); 2943 return (EINVAL); 2944 } 2945 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2946 G_MIRROR_DEBUG(1, 2947 "Invalid disk flags on disk %s (device %s), skipping.", 2948 pp->name, sc->sc_name); 2949 return (EINVAL); 2950 } 2951 return (0); 2952 } 2953 2954 int 2955 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2956 struct g_mirror_metadata *md) 2957 { 2958 struct g_mirror_disk *disk; 2959 int error; 2960 2961 g_topology_assert_not(); 2962 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2963 2964 error = g_mirror_check_metadata(sc, pp, md); 2965 if (error != 0) 2966 return (error); 2967 2968 if (md->md_genid < sc->sc_genid) { 2969 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2970 pp->name, sc->sc_name); 2971 return (EINVAL); 2972 } 2973 2974 /* 2975 * If the component disk we're tasting has newer metadata than the 2976 * STARTING gmirror device, refresh the device from the component. 2977 */ 2978 error = g_mirror_refresh_device(sc, pp, md); 2979 if (error != 0) 2980 return (error); 2981 2982 disk = g_mirror_init_disk(sc, pp, md, &error); 2983 if (disk == NULL) 2984 return (error); 2985 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2986 G_MIRROR_EVENT_WAIT); 2987 if (error != 0) 2988 return (error); 2989 if (md->md_version < G_MIRROR_VERSION) { 2990 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2991 pp->name, md->md_version, G_MIRROR_VERSION); 2992 g_mirror_update_metadata(disk); 2993 } 2994 return (0); 2995 } 2996 2997 static void 2998 g_mirror_destroy_delayed(void *arg, int flag) 2999 { 3000 struct g_mirror_softc *sc; 3001 int error; 3002 3003 if (flag == EV_CANCEL) { 3004 G_MIRROR_DEBUG(1, "Destroying canceled."); 3005 return; 3006 } 3007 sc = arg; 3008 g_topology_unlock(); 3009 sx_xlock(&sc->sc_lock); 3010 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 3011 ("DESTROY flag set on %s.", sc->sc_name)); 3012 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, 3013 ("CLOSEWAIT flag not set on %s.", sc->sc_name)); 3014 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 3015 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 3016 if (error != 0) { 3017 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 3018 sc->sc_name, error); 3019 sx_xunlock(&sc->sc_lock); 3020 } 3021 g_topology_lock(); 3022 } 3023 3024 static int 3025 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 3026 { 3027 struct g_mirror_softc *sc; 3028 int error = 0; 3029 3030 g_topology_assert(); 3031 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 3032 acw, ace); 3033 3034 sc = pp->private; 3035 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 3036 3037 g_topology_unlock(); 3038 sx_xlock(&sc->sc_lock); 3039 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 3040 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || 3041 LIST_EMPTY(&sc->sc_disks)) { 3042 if (acr > 0 || acw > 0 || ace > 0) 3043 error = ENXIO; 3044 goto end; 3045 } 3046 sc->sc_provider_open += acr + acw + ace; 3047 if (pp->acw + acw == 0) 3048 g_mirror_idle(sc, 0); 3049 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && 3050 sc->sc_provider_open == 0) 3051 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 3052 end: 3053 sx_xunlock(&sc->sc_lock); 3054 g_topology_lock(); 3055 return (error); 3056 } 3057 3058 static void 3059 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, 3060 const struct g_mirror_metadata *md) 3061 { 3062 3063 sc->sc_genid = md->md_genid; 3064 sc->sc_syncid = md->md_syncid; 3065 3066 sc->sc_slice = md->md_slice; 3067 sc->sc_balance = md->md_balance; 3068 sc->sc_mediasize = md->md_mediasize; 3069 sc->sc_ndisks = md->md_all; 3070 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; 3071 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); 3072 } 3073 3074 struct g_geom * 3075 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 3076 u_int type) 3077 { 3078 struct g_mirror_softc *sc; 3079 struct g_geom *gp; 3080 int error, timeout; 3081 3082 g_topology_assert(); 3083 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 3084 md->md_mid); 3085 3086 /* One disk is minimum. */ 3087 if (md->md_all < 1) 3088 return (NULL); 3089 /* 3090 * Action geom. 3091 */ 3092 gp = g_new_geomf(mp, "%s", md->md_name); 3093 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 3094 gp->start = g_mirror_start; 3095 gp->orphan = g_mirror_orphan; 3096 gp->access = g_mirror_access; 3097 gp->dumpconf = g_mirror_dumpconf; 3098 3099 sc->sc_type = type; 3100 sc->sc_id = md->md_mid; 3101 g_mirror_reinit_from_metadata(sc, md); 3102 sc->sc_sectorsize = md->md_sectorsize; 3103 sc->sc_bump_id = 0; 3104 sc->sc_idle = 1; 3105 sc->sc_last_write = time_uptime; 3106 sc->sc_writes = 0; 3107 sc->sc_refcnt = 1; 3108 sx_init(&sc->sc_lock, "gmirror:lock"); 3109 TAILQ_INIT(&sc->sc_queue); 3110 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 3111 TAILQ_INIT(&sc->sc_regular_delayed); 3112 TAILQ_INIT(&sc->sc_inflight); 3113 TAILQ_INIT(&sc->sc_sync_delayed); 3114 LIST_INIT(&sc->sc_disks); 3115 TAILQ_INIT(&sc->sc_events); 3116 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 3117 callout_init(&sc->sc_callout, 1); 3118 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 3119 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3120 gp->softc = sc; 3121 sc->sc_geom = gp; 3122 sc->sc_provider = NULL; 3123 sc->sc_provider_open = 0; 3124 /* 3125 * Synchronization geom. 3126 */ 3127 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3128 gp->softc = sc; 3129 gp->orphan = g_mirror_orphan; 3130 sc->sc_sync.ds_geom = gp; 3131 sc->sc_sync.ds_ndisks = 0; 3132 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3133 "g_mirror %s", md->md_name); 3134 if (error != 0) { 3135 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3136 sc->sc_name); 3137 g_destroy_geom(sc->sc_sync.ds_geom); 3138 g_destroy_geom(sc->sc_geom); 3139 g_mirror_free_device(sc); 3140 return (NULL); 3141 } 3142 3143 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3144 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3145 3146 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3147 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3148 /* 3149 * Run timeout. 3150 */ 3151 timeout = g_mirror_timeout * hz; 3152 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3153 return (sc->sc_geom); 3154 } 3155 3156 int 3157 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3158 { 3159 struct g_mirror_disk *disk; 3160 3161 g_topology_assert_not(); 3162 sx_assert(&sc->sc_lock, SX_XLOCKED); 3163 3164 if (sc->sc_provider_open != 0) { 3165 switch (how) { 3166 case G_MIRROR_DESTROY_SOFT: 3167 G_MIRROR_DEBUG(1, 3168 "Device %s is still open (%d).", sc->sc_name, 3169 sc->sc_provider_open); 3170 return (EBUSY); 3171 case G_MIRROR_DESTROY_DELAYED: 3172 G_MIRROR_DEBUG(1, 3173 "Device %s will be destroyed on last close.", 3174 sc->sc_name); 3175 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3176 if (disk->d_state == 3177 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3178 g_mirror_sync_stop(disk, 1); 3179 } 3180 } 3181 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; 3182 return (EBUSY); 3183 case G_MIRROR_DESTROY_HARD: 3184 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3185 "can't be definitely removed.", sc->sc_name); 3186 } 3187 } 3188 3189 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3190 sx_xunlock(&sc->sc_lock); 3191 return (0); 3192 } 3193 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3194 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; 3195 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3196 sx_xunlock(&sc->sc_lock); 3197 mtx_lock(&sc->sc_queue_mtx); 3198 wakeup(sc); 3199 mtx_unlock(&sc->sc_queue_mtx); 3200 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3201 while (sc->sc_worker != NULL) 3202 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3203 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3204 sx_xlock(&sc->sc_lock); 3205 g_mirror_destroy_device(sc); 3206 return (0); 3207 } 3208 3209 static void 3210 g_mirror_taste_orphan(struct g_consumer *cp) 3211 { 3212 3213 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3214 cp->provider->name)); 3215 } 3216 3217 static struct g_geom * 3218 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3219 { 3220 struct g_mirror_metadata md; 3221 struct g_mirror_softc *sc; 3222 struct g_consumer *cp; 3223 struct g_geom *gp; 3224 int error; 3225 3226 g_topology_assert(); 3227 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3228 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3229 3230 gp = g_new_geomf(mp, "mirror:taste"); 3231 /* 3232 * This orphan function should be never called. 3233 */ 3234 gp->orphan = g_mirror_taste_orphan; 3235 cp = g_new_consumer(gp); 3236 g_attach(cp, pp); 3237 error = g_mirror_read_metadata(cp, &md); 3238 g_detach(cp); 3239 g_destroy_consumer(cp); 3240 g_destroy_geom(gp); 3241 if (error != 0) 3242 return (NULL); 3243 gp = NULL; 3244 3245 if (md.md_provider[0] != '\0' && 3246 !g_compare_names(md.md_provider, pp->name)) 3247 return (NULL); 3248 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3249 return (NULL); 3250 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3251 G_MIRROR_DEBUG(0, 3252 "Device %s: provider %s marked as inactive, skipping.", 3253 md.md_name, pp->name); 3254 return (NULL); 3255 } 3256 if (g_mirror_debug >= 2) 3257 mirror_metadata_dump(&md); 3258 3259 /* 3260 * Let's check if device already exists. 3261 */ 3262 sc = NULL; 3263 LIST_FOREACH(gp, &mp->geom, geom) { 3264 sc = gp->softc; 3265 if (sc == NULL) 3266 continue; 3267 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3268 continue; 3269 if (sc->sc_sync.ds_geom == gp) 3270 continue; 3271 if (strcmp(md.md_name, sc->sc_name) != 0) 3272 continue; 3273 if (md.md_mid != sc->sc_id) { 3274 G_MIRROR_DEBUG(0, "Device %s already configured.", 3275 sc->sc_name); 3276 return (NULL); 3277 } 3278 break; 3279 } 3280 if (gp == NULL) { 3281 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3282 if (gp == NULL) { 3283 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3284 md.md_name); 3285 return (NULL); 3286 } 3287 sc = gp->softc; 3288 } 3289 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3290 g_topology_unlock(); 3291 sx_xlock(&sc->sc_lock); 3292 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3293 error = g_mirror_add_disk(sc, pp, &md); 3294 if (error != 0) { 3295 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3296 pp->name, gp->name, error); 3297 if (LIST_EMPTY(&sc->sc_disks)) { 3298 g_cancel_event(sc); 3299 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3300 g_topology_lock(); 3301 return (NULL); 3302 } 3303 gp = NULL; 3304 } 3305 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3306 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3307 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3308 g_topology_lock(); 3309 return (NULL); 3310 } 3311 sx_xunlock(&sc->sc_lock); 3312 g_topology_lock(); 3313 return (gp); 3314 } 3315 3316 static void 3317 g_mirror_resize(struct g_consumer *cp) 3318 { 3319 struct g_mirror_disk *disk; 3320 3321 g_topology_assert(); 3322 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3323 3324 disk = cp->private; 3325 if (disk == NULL) 3326 return; 3327 g_topology_unlock(); 3328 g_mirror_update_metadata(disk); 3329 g_topology_lock(); 3330 } 3331 3332 static int 3333 g_mirror_destroy_geom(struct gctl_req *req __unused, 3334 struct g_class *mp __unused, struct g_geom *gp) 3335 { 3336 struct g_mirror_softc *sc; 3337 int error; 3338 3339 g_topology_unlock(); 3340 sc = gp->softc; 3341 sx_xlock(&sc->sc_lock); 3342 g_cancel_event(sc); 3343 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3344 if (error != 0) 3345 sx_xunlock(&sc->sc_lock); 3346 g_topology_lock(); 3347 return (error); 3348 } 3349 3350 static void 3351 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3352 struct g_consumer *cp, struct g_provider *pp) 3353 { 3354 struct g_mirror_softc *sc; 3355 3356 g_topology_assert(); 3357 3358 sc = gp->softc; 3359 if (sc == NULL) 3360 return; 3361 /* Skip synchronization geom. */ 3362 if (gp == sc->sc_sync.ds_geom) 3363 return; 3364 if (pp != NULL) { 3365 /* Nothing here. */ 3366 } else if (cp != NULL) { 3367 struct g_mirror_disk *disk; 3368 3369 disk = cp->private; 3370 if (disk == NULL) 3371 return; 3372 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3373 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3374 sbuf_printf(sb, "%s<Synchronized>", indent); 3375 if (disk->d_sync.ds_offset == 0) 3376 sbuf_printf(sb, "0%%"); 3377 else 3378 sbuf_printf(sb, "%u%%", 3379 (u_int)((disk->d_sync.ds_offset * 100) / 3380 sc->sc_mediasize)); 3381 sbuf_printf(sb, "</Synchronized>\n"); 3382 if (disk->d_sync.ds_offset > 0) 3383 sbuf_printf(sb, "%s<BytesSynced>%jd" 3384 "</BytesSynced>\n", indent, 3385 (intmax_t)disk->d_sync.ds_offset); 3386 } 3387 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3388 disk->d_sync.ds_syncid); 3389 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3390 disk->d_genid); 3391 sbuf_printf(sb, "%s<Flags>", indent); 3392 if (disk->d_flags == 0) 3393 sbuf_printf(sb, "NONE"); 3394 else { 3395 int first = 1; 3396 3397 #define ADD_FLAG(flag, name) do { \ 3398 if ((disk->d_flags & (flag)) != 0) { \ 3399 if (!first) \ 3400 sbuf_printf(sb, ", "); \ 3401 else \ 3402 first = 0; \ 3403 sbuf_printf(sb, name); \ 3404 } \ 3405 } while (0) 3406 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3407 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3408 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3409 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3410 "SYNCHRONIZING"); 3411 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3412 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3413 #undef ADD_FLAG 3414 } 3415 sbuf_printf(sb, "</Flags>\n"); 3416 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3417 disk->d_priority); 3418 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3419 g_mirror_disk_state2str(disk->d_state)); 3420 } else { 3421 sbuf_printf(sb, "%s<Type>", indent); 3422 switch (sc->sc_type) { 3423 case G_MIRROR_TYPE_AUTOMATIC: 3424 sbuf_printf(sb, "AUTOMATIC"); 3425 break; 3426 case G_MIRROR_TYPE_MANUAL: 3427 sbuf_printf(sb, "MANUAL"); 3428 break; 3429 default: 3430 sbuf_printf(sb, "UNKNOWN"); 3431 break; 3432 } 3433 sbuf_printf(sb, "</Type>\n"); 3434 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3435 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3436 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3437 sbuf_printf(sb, "%s<Flags>", indent); 3438 if (sc->sc_flags == 0) 3439 sbuf_printf(sb, "NONE"); 3440 else { 3441 int first = 1; 3442 3443 #define ADD_FLAG(flag, name) do { \ 3444 if ((sc->sc_flags & (flag)) != 0) { \ 3445 if (!first) \ 3446 sbuf_printf(sb, ", "); \ 3447 else \ 3448 first = 0; \ 3449 sbuf_printf(sb, name); \ 3450 } \ 3451 } while (0) 3452 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3453 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3454 #undef ADD_FLAG 3455 } 3456 sbuf_printf(sb, "</Flags>\n"); 3457 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3458 (u_int)sc->sc_slice); 3459 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3460 balance_name(sc->sc_balance)); 3461 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3462 sc->sc_ndisks); 3463 sbuf_printf(sb, "%s<State>", indent); 3464 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3465 sbuf_printf(sb, "%s", "STARTING"); 3466 else if (sc->sc_ndisks == 3467 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3468 sbuf_printf(sb, "%s", "COMPLETE"); 3469 else 3470 sbuf_printf(sb, "%s", "DEGRADED"); 3471 sbuf_printf(sb, "</State>\n"); 3472 } 3473 } 3474 3475 static void 3476 g_mirror_shutdown_post_sync(void *arg, int howto) 3477 { 3478 struct g_class *mp; 3479 struct g_geom *gp, *gp2; 3480 struct g_mirror_softc *sc; 3481 int error; 3482 3483 if (panicstr != NULL) 3484 return; 3485 3486 mp = arg; 3487 g_topology_lock(); 3488 g_mirror_shutdown = 1; 3489 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3490 if ((sc = gp->softc) == NULL) 3491 continue; 3492 /* Skip synchronization geom. */ 3493 if (gp == sc->sc_sync.ds_geom) 3494 continue; 3495 g_topology_unlock(); 3496 sx_xlock(&sc->sc_lock); 3497 g_mirror_idle(sc, -1); 3498 g_cancel_event(sc); 3499 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3500 if (error != 0) 3501 sx_xunlock(&sc->sc_lock); 3502 g_topology_lock(); 3503 } 3504 g_topology_unlock(); 3505 } 3506 3507 static void 3508 g_mirror_init(struct g_class *mp) 3509 { 3510 3511 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3512 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3513 if (g_mirror_post_sync == NULL) 3514 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3515 } 3516 3517 static void 3518 g_mirror_fini(struct g_class *mp) 3519 { 3520 3521 if (g_mirror_post_sync != NULL) 3522 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3523 } 3524 3525 /* 3526 * Refresh the mirror device's metadata when gmirror encounters a newer 3527 * generation as the individual components are being added to the mirror set. 3528 */ 3529 static int 3530 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, 3531 const struct g_mirror_metadata *md) 3532 { 3533 3534 g_topology_assert_not(); 3535 sx_assert(&sc->sc_lock, SX_XLOCKED); 3536 3537 KASSERT(sc->sc_genid <= md->md_genid, 3538 ("%s: attempted to refresh from stale component %s (device %s) " 3539 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, 3540 sc->sc_genid)); 3541 3542 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && 3543 sc->sc_syncid >= md->md_syncid)) 3544 return (0); 3545 3546 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " 3547 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " 3548 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, 3549 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); 3550 3551 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { 3552 /* Probable data corruption detected */ 3553 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " 3554 "(device=%s genid=%u). A stale mirror device was launched.", 3555 g_mirror_device_state2str(sc->sc_state), sc->sc_name, 3556 sc->sc_genid); 3557 return (EINVAL); 3558 } 3559 3560 /* Update softc */ 3561 g_mirror_reinit_from_metadata(sc, md); 3562 3563 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " 3564 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, 3565 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, 3566 md->md_syncid, (unsigned)md->md_all); 3567 3568 return (0); 3569 } 3570 3571 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3572 MODULE_VERSION(geom_mirror, 0); 3573