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/geom_dbg.h> 51 #include <geom/mirror/g_mirror.h> 52 53 FEATURE(geom_mirror, "GEOM mirroring support"); 54 55 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 56 57 SYSCTL_DECL(_kern_geom); 58 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 59 "GEOM_MIRROR stuff"); 60 int g_mirror_debug = 0; 61 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 62 "Debug level"); 63 bool g_launch_mirror_before_timeout = true; 64 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, 65 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, 66 "If false, force gmirror to wait out the full kern.geom.mirror.timeout " 67 "before launching mirrors"); 68 static u_int g_mirror_timeout = 4; 69 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 70 0, "Time to wait on all mirror components"); 71 static u_int g_mirror_idletime = 5; 72 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 73 &g_mirror_idletime, 0, "Mark components as clean when idling"); 74 static u_int g_mirror_disconnect_on_failure = 1; 75 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 76 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 77 static u_int g_mirror_syncreqs = 2; 78 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 79 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 80 static u_int g_mirror_sync_period = 5; 81 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, 82 &g_mirror_sync_period, 0, 83 "Metadata update period during synchronization, in seconds"); 84 85 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 86 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 87 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 88 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 89 } while (0) 90 91 static eventhandler_tag g_mirror_post_sync = NULL; 92 static int g_mirror_shutdown = 0; 93 94 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 95 static g_taste_t g_mirror_taste; 96 static g_init_t g_mirror_init; 97 static g_fini_t g_mirror_fini; 98 static g_provgone_t g_mirror_providergone; 99 static g_resize_t g_mirror_resize; 100 101 struct g_class g_mirror_class = { 102 .name = G_MIRROR_CLASS_NAME, 103 .version = G_VERSION, 104 .ctlreq = g_mirror_config, 105 .taste = g_mirror_taste, 106 .destroy_geom = g_mirror_destroy_geom, 107 .init = g_mirror_init, 108 .fini = g_mirror_fini, 109 .providergone = g_mirror_providergone, 110 .resize = g_mirror_resize 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 static const char * 128 g_mirror_disk_state2str(int state) 129 { 130 131 switch (state) { 132 case G_MIRROR_DISK_STATE_NONE: 133 return ("NONE"); 134 case G_MIRROR_DISK_STATE_NEW: 135 return ("NEW"); 136 case G_MIRROR_DISK_STATE_ACTIVE: 137 return ("ACTIVE"); 138 case G_MIRROR_DISK_STATE_STALE: 139 return ("STALE"); 140 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 141 return ("SYNCHRONIZING"); 142 case G_MIRROR_DISK_STATE_DISCONNECTED: 143 return ("DISCONNECTED"); 144 case G_MIRROR_DISK_STATE_DESTROY: 145 return ("DESTROY"); 146 default: 147 return ("INVALID"); 148 } 149 } 150 151 static const char * 152 g_mirror_device_state2str(int state) 153 { 154 155 switch (state) { 156 case G_MIRROR_DEVICE_STATE_STARTING: 157 return ("STARTING"); 158 case G_MIRROR_DEVICE_STATE_RUNNING: 159 return ("RUNNING"); 160 default: 161 return ("INVALID"); 162 } 163 } 164 165 static const char * 166 g_mirror_get_diskname(struct g_mirror_disk *disk) 167 { 168 169 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 170 return ("[unknown]"); 171 return (disk->d_name); 172 } 173 174 /* 175 * --- Events handling functions --- 176 * Events in geom_mirror are used to maintain disks and device status 177 * from one thread to simplify locking. 178 */ 179 static void 180 g_mirror_event_free(struct g_mirror_event *ep) 181 { 182 183 free(ep, M_MIRROR); 184 } 185 186 int 187 g_mirror_event_send(void *arg, int state, int flags) 188 { 189 struct g_mirror_softc *sc; 190 struct g_mirror_disk *disk; 191 struct g_mirror_event *ep; 192 int error; 193 194 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 195 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 196 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 197 disk = NULL; 198 sc = arg; 199 } else { 200 disk = arg; 201 sc = disk->d_softc; 202 } 203 ep->e_disk = disk; 204 ep->e_state = state; 205 ep->e_flags = flags; 206 ep->e_error = 0; 207 mtx_lock(&sc->sc_events_mtx); 208 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 209 mtx_unlock(&sc->sc_events_mtx); 210 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 211 mtx_lock(&sc->sc_queue_mtx); 212 wakeup(sc); 213 mtx_unlock(&sc->sc_queue_mtx); 214 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 215 return (0); 216 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 217 sx_xunlock(&sc->sc_lock); 218 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 219 mtx_lock(&sc->sc_events_mtx); 220 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 221 hz * 5); 222 } 223 error = ep->e_error; 224 g_mirror_event_free(ep); 225 sx_xlock(&sc->sc_lock); 226 return (error); 227 } 228 229 static struct g_mirror_event * 230 g_mirror_event_first(struct g_mirror_softc *sc) 231 { 232 struct g_mirror_event *ep; 233 234 mtx_lock(&sc->sc_events_mtx); 235 ep = TAILQ_FIRST(&sc->sc_events); 236 mtx_unlock(&sc->sc_events_mtx); 237 return (ep); 238 } 239 240 static void 241 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 242 { 243 244 mtx_lock(&sc->sc_events_mtx); 245 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 246 mtx_unlock(&sc->sc_events_mtx); 247 } 248 249 static void 250 g_mirror_event_cancel(struct g_mirror_disk *disk) 251 { 252 struct g_mirror_softc *sc; 253 struct g_mirror_event *ep, *tmpep; 254 255 sc = disk->d_softc; 256 sx_assert(&sc->sc_lock, SX_XLOCKED); 257 258 mtx_lock(&sc->sc_events_mtx); 259 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 260 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 261 continue; 262 if (ep->e_disk != disk) 263 continue; 264 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 265 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 266 g_mirror_event_free(ep); 267 else { 268 ep->e_error = ECANCELED; 269 wakeup(ep); 270 } 271 } 272 mtx_unlock(&sc->sc_events_mtx); 273 } 274 275 /* 276 * Return the number of disks in given state. 277 * If state is equal to -1, count all connected disks. 278 */ 279 u_int 280 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 281 { 282 struct g_mirror_disk *disk; 283 u_int n = 0; 284 285 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 286 if (state == -1 || disk->d_state == state) 287 n++; 288 } 289 return (n); 290 } 291 292 /* 293 * Find a disk in mirror by its disk ID. 294 */ 295 static struct g_mirror_disk * 296 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 297 { 298 struct g_mirror_disk *disk; 299 300 sx_assert(&sc->sc_lock, SX_XLOCKED); 301 302 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 303 if (disk->d_id == id) 304 return (disk); 305 } 306 return (NULL); 307 } 308 309 static u_int 310 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 311 { 312 struct bio *bp; 313 u_int nreqs = 0; 314 315 mtx_lock(&sc->sc_queue_mtx); 316 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) { 317 if (bp->bio_from == cp) 318 nreqs++; 319 } 320 mtx_unlock(&sc->sc_queue_mtx); 321 return (nreqs); 322 } 323 324 static int 325 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 326 { 327 328 if (cp->index > 0) { 329 G_MIRROR_DEBUG(2, 330 "I/O requests for %s exist, can't destroy it now.", 331 cp->provider->name); 332 return (1); 333 } 334 if (g_mirror_nrequests(sc, cp) > 0) { 335 G_MIRROR_DEBUG(2, 336 "I/O requests for %s in queue, can't destroy it now.", 337 cp->provider->name); 338 return (1); 339 } 340 return (0); 341 } 342 343 static void 344 g_mirror_destroy_consumer(void *arg, int flags __unused) 345 { 346 struct g_consumer *cp; 347 348 g_topology_assert(); 349 350 cp = arg; 351 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 352 g_detach(cp); 353 g_destroy_consumer(cp); 354 } 355 356 static void 357 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 358 { 359 struct g_provider *pp; 360 int retaste_wait; 361 362 g_topology_assert(); 363 364 cp->private = NULL; 365 if (g_mirror_is_busy(sc, cp)) 366 return; 367 pp = cp->provider; 368 retaste_wait = 0; 369 if (cp->acw == 1) { 370 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 371 retaste_wait = 1; 372 } 373 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 374 -cp->acw, -cp->ace, 0); 375 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 376 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 377 if (retaste_wait) { 378 /* 379 * After retaste event was send (inside g_access()), we can send 380 * event to detach and destroy consumer. 381 * A class, which has consumer to the given provider connected 382 * will not receive retaste event for the provider. 383 * This is the way how I ignore retaste events when I close 384 * consumers opened for write: I detach and destroy consumer 385 * after retaste event is sent. 386 */ 387 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 388 return; 389 } 390 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 391 g_detach(cp); 392 g_destroy_consumer(cp); 393 } 394 395 static int 396 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 397 { 398 struct g_consumer *cp; 399 int error; 400 401 g_topology_assert_not(); 402 KASSERT(disk->d_consumer == NULL, 403 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 404 405 g_topology_lock(); 406 cp = g_new_consumer(disk->d_softc->sc_geom); 407 cp->flags |= G_CF_DIRECT_RECEIVE; 408 error = g_attach(cp, pp); 409 if (error != 0) { 410 g_destroy_consumer(cp); 411 g_topology_unlock(); 412 return (error); 413 } 414 error = g_access(cp, 1, 1, 1); 415 if (error != 0) { 416 g_detach(cp); 417 g_destroy_consumer(cp); 418 g_topology_unlock(); 419 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 420 pp->name, error); 421 return (error); 422 } 423 g_topology_unlock(); 424 disk->d_consumer = cp; 425 disk->d_consumer->private = disk; 426 disk->d_consumer->index = 0; 427 428 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 429 return (0); 430 } 431 432 static void 433 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 434 { 435 436 g_topology_assert(); 437 438 if (cp == NULL) 439 return; 440 if (cp->provider != NULL) 441 g_mirror_kill_consumer(sc, cp); 442 else 443 g_destroy_consumer(cp); 444 } 445 446 /* 447 * Initialize disk. This means allocate memory, create consumer, attach it 448 * to the provider and open access (r1w1e1) to it. 449 */ 450 static struct g_mirror_disk * 451 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 452 struct g_mirror_metadata *md, int *errorp) 453 { 454 struct g_mirror_disk *disk; 455 int i, error; 456 457 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 458 if (disk == NULL) { 459 error = ENOMEM; 460 goto fail; 461 } 462 disk->d_softc = sc; 463 error = g_mirror_connect_disk(disk, pp); 464 if (error != 0) 465 goto fail; 466 disk->d_id = md->md_did; 467 disk->d_state = G_MIRROR_DISK_STATE_NONE; 468 disk->d_priority = md->md_priority; 469 disk->d_flags = md->md_dflags; 470 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 471 if (error == 0 && i != 0) 472 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 473 if (md->md_provider[0] != '\0') 474 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 475 disk->d_sync.ds_consumer = NULL; 476 disk->d_sync.ds_offset = md->md_sync_offset; 477 disk->d_sync.ds_offset_done = md->md_sync_offset; 478 disk->d_sync.ds_update_ts = time_uptime; 479 disk->d_genid = md->md_genid; 480 disk->d_sync.ds_syncid = md->md_syncid; 481 disk->d_init_ndisks = md->md_all; 482 disk->d_init_slice = md->md_slice; 483 disk->d_init_balance = md->md_balance; 484 disk->d_init_mediasize = md->md_mediasize; 485 if (errorp != NULL) 486 *errorp = 0; 487 return (disk); 488 fail: 489 if (errorp != NULL) 490 *errorp = error; 491 if (disk != NULL) 492 free(disk, M_MIRROR); 493 return (NULL); 494 } 495 496 static void 497 g_mirror_destroy_disk(struct g_mirror_disk *disk) 498 { 499 struct g_mirror_softc *sc; 500 501 g_topology_assert_not(); 502 sc = disk->d_softc; 503 sx_assert(&sc->sc_lock, SX_XLOCKED); 504 505 g_topology_lock(); 506 LIST_REMOVE(disk, d_next); 507 g_topology_unlock(); 508 g_mirror_event_cancel(disk); 509 if (sc->sc_hint == disk) 510 sc->sc_hint = NULL; 511 switch (disk->d_state) { 512 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 513 g_mirror_sync_stop(disk, 1); 514 /* FALLTHROUGH */ 515 case G_MIRROR_DISK_STATE_NEW: 516 case G_MIRROR_DISK_STATE_STALE: 517 case G_MIRROR_DISK_STATE_ACTIVE: 518 g_topology_lock(); 519 g_mirror_disconnect_consumer(sc, disk->d_consumer); 520 g_topology_unlock(); 521 free(disk, M_MIRROR); 522 break; 523 default: 524 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 525 g_mirror_get_diskname(disk), 526 g_mirror_disk_state2str(disk->d_state))); 527 } 528 } 529 530 static void 531 g_mirror_free_device(struct g_mirror_softc *sc) 532 { 533 534 g_topology_assert(); 535 536 mtx_destroy(&sc->sc_queue_mtx); 537 mtx_destroy(&sc->sc_events_mtx); 538 mtx_destroy(&sc->sc_done_mtx); 539 sx_destroy(&sc->sc_lock); 540 free(sc, M_MIRROR); 541 } 542 543 static void 544 g_mirror_providergone(struct g_provider *pp) 545 { 546 struct g_mirror_softc *sc = pp->private; 547 548 if ((--sc->sc_refcnt) == 0) 549 g_mirror_free_device(sc); 550 } 551 552 static void 553 g_mirror_destroy_device(struct g_mirror_softc *sc) 554 { 555 struct g_mirror_disk *disk; 556 struct g_mirror_event *ep; 557 struct g_geom *gp; 558 struct g_consumer *cp, *tmpcp; 559 560 g_topology_assert_not(); 561 sx_assert(&sc->sc_lock, SX_XLOCKED); 562 563 gp = sc->sc_geom; 564 if (sc->sc_provider != NULL) 565 g_mirror_destroy_provider(sc); 566 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 567 disk = LIST_FIRST(&sc->sc_disks)) { 568 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 569 g_mirror_update_metadata(disk); 570 g_mirror_destroy_disk(disk); 571 } 572 while ((ep = g_mirror_event_first(sc)) != NULL) { 573 g_mirror_event_remove(sc, ep); 574 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 575 g_mirror_event_free(ep); 576 else { 577 ep->e_error = ECANCELED; 578 ep->e_flags |= G_MIRROR_EVENT_DONE; 579 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 580 mtx_lock(&sc->sc_events_mtx); 581 wakeup(ep); 582 mtx_unlock(&sc->sc_events_mtx); 583 } 584 } 585 callout_drain(&sc->sc_callout); 586 587 g_topology_lock(); 588 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 589 g_mirror_disconnect_consumer(sc, cp); 590 } 591 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 592 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 593 g_wither_geom(gp, ENXIO); 594 sx_xunlock(&sc->sc_lock); 595 if ((--sc->sc_refcnt) == 0) 596 g_mirror_free_device(sc); 597 g_topology_unlock(); 598 } 599 600 static void 601 g_mirror_orphan(struct g_consumer *cp) 602 { 603 struct g_mirror_disk *disk; 604 605 g_topology_assert(); 606 607 disk = cp->private; 608 if (disk == NULL) 609 return; 610 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 611 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 612 G_MIRROR_EVENT_DONTWAIT); 613 } 614 615 /* 616 * Function should return the next active disk on the list. 617 * It is possible that it will be the same disk as given. 618 * If there are no active disks on list, NULL is returned. 619 */ 620 static __inline struct g_mirror_disk * 621 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 622 { 623 struct g_mirror_disk *dp; 624 625 for (dp = LIST_NEXT(disk, d_next); dp != disk; 626 dp = LIST_NEXT(dp, d_next)) { 627 if (dp == NULL) 628 dp = LIST_FIRST(&sc->sc_disks); 629 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 630 break; 631 } 632 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 633 return (NULL); 634 return (dp); 635 } 636 637 static struct g_mirror_disk * 638 g_mirror_get_disk(struct g_mirror_softc *sc) 639 { 640 struct g_mirror_disk *disk; 641 642 if (sc->sc_hint == NULL) { 643 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 644 if (sc->sc_hint == NULL) 645 return (NULL); 646 } 647 disk = sc->sc_hint; 648 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 649 disk = g_mirror_find_next(sc, disk); 650 if (disk == NULL) 651 return (NULL); 652 } 653 sc->sc_hint = g_mirror_find_next(sc, disk); 654 return (disk); 655 } 656 657 static int 658 g_mirror_write_metadata(struct g_mirror_disk *disk, 659 struct g_mirror_metadata *md) 660 { 661 struct g_mirror_softc *sc; 662 struct g_consumer *cp; 663 off_t offset, length; 664 u_char *sector; 665 int error = 0; 666 667 g_topology_assert_not(); 668 sc = disk->d_softc; 669 sx_assert(&sc->sc_lock, SX_LOCKED); 670 671 cp = disk->d_consumer; 672 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 673 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 674 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 675 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 676 cp->acw, cp->ace)); 677 length = cp->provider->sectorsize; 678 offset = cp->provider->mediasize - length; 679 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 680 if (md != NULL && 681 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 682 /* 683 * Handle the case, when the size of parent provider reduced. 684 */ 685 if (offset < md->md_mediasize) 686 error = ENOSPC; 687 else 688 mirror_metadata_encode(md, sector); 689 } 690 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 691 if (error == 0) 692 error = g_write_data(cp, offset, sector, length); 693 free(sector, M_MIRROR); 694 if (error != 0) { 695 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 696 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 697 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 698 "(device=%s, error=%d).", 699 g_mirror_get_diskname(disk), sc->sc_name, error); 700 } else { 701 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 702 "(device=%s, error=%d).", 703 g_mirror_get_diskname(disk), sc->sc_name, error); 704 } 705 if (g_mirror_disconnect_on_failure && 706 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 707 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 708 g_mirror_event_send(disk, 709 G_MIRROR_DISK_STATE_DISCONNECTED, 710 G_MIRROR_EVENT_DONTWAIT); 711 } 712 } 713 return (error); 714 } 715 716 static int 717 g_mirror_clear_metadata(struct g_mirror_disk *disk) 718 { 719 int error; 720 721 g_topology_assert_not(); 722 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 723 724 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 725 return (0); 726 error = g_mirror_write_metadata(disk, NULL); 727 if (error == 0) { 728 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 729 g_mirror_get_diskname(disk)); 730 } else { 731 G_MIRROR_DEBUG(0, 732 "Cannot clear metadata on disk %s (error=%d).", 733 g_mirror_get_diskname(disk), error); 734 } 735 return (error); 736 } 737 738 void 739 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 740 struct g_mirror_metadata *md) 741 { 742 743 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 744 md->md_version = G_MIRROR_VERSION; 745 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 746 md->md_mid = sc->sc_id; 747 md->md_all = sc->sc_ndisks; 748 md->md_slice = sc->sc_slice; 749 md->md_balance = sc->sc_balance; 750 md->md_genid = sc->sc_genid; 751 md->md_mediasize = sc->sc_mediasize; 752 md->md_sectorsize = sc->sc_sectorsize; 753 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 754 bzero(md->md_provider, sizeof(md->md_provider)); 755 if (disk == NULL) { 756 md->md_did = arc4random(); 757 md->md_priority = 0; 758 md->md_syncid = 0; 759 md->md_dflags = 0; 760 md->md_sync_offset = 0; 761 md->md_provsize = 0; 762 } else { 763 md->md_did = disk->d_id; 764 md->md_priority = disk->d_priority; 765 md->md_syncid = disk->d_sync.ds_syncid; 766 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 767 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 768 md->md_sync_offset = disk->d_sync.ds_offset_done; 769 else 770 md->md_sync_offset = 0; 771 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 772 strlcpy(md->md_provider, 773 disk->d_consumer->provider->name, 774 sizeof(md->md_provider)); 775 } 776 md->md_provsize = disk->d_consumer->provider->mediasize; 777 } 778 } 779 780 void 781 g_mirror_update_metadata(struct g_mirror_disk *disk) 782 { 783 struct g_mirror_softc *sc; 784 struct g_mirror_metadata md; 785 int error; 786 787 g_topology_assert_not(); 788 sc = disk->d_softc; 789 sx_assert(&sc->sc_lock, SX_LOCKED); 790 791 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 792 return; 793 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 794 g_mirror_fill_metadata(sc, disk, &md); 795 error = g_mirror_write_metadata(disk, &md); 796 if (error == 0) { 797 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 798 g_mirror_get_diskname(disk)); 799 } else { 800 G_MIRROR_DEBUG(0, 801 "Cannot update metadata on disk %s (error=%d).", 802 g_mirror_get_diskname(disk), error); 803 } 804 } 805 806 static void 807 g_mirror_bump_syncid(struct g_mirror_softc *sc) 808 { 809 struct g_mirror_disk *disk; 810 811 g_topology_assert_not(); 812 sx_assert(&sc->sc_lock, SX_XLOCKED); 813 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 814 ("%s called with no active disks (device=%s).", __func__, 815 sc->sc_name)); 816 817 sc->sc_syncid++; 818 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 819 sc->sc_syncid); 820 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 821 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 822 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 823 disk->d_sync.ds_syncid = sc->sc_syncid; 824 g_mirror_update_metadata(disk); 825 } 826 } 827 } 828 829 static void 830 g_mirror_bump_genid(struct g_mirror_softc *sc) 831 { 832 struct g_mirror_disk *disk; 833 834 g_topology_assert_not(); 835 sx_assert(&sc->sc_lock, SX_XLOCKED); 836 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 837 ("%s called with no active disks (device=%s).", __func__, 838 sc->sc_name)); 839 840 sc->sc_genid++; 841 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 842 sc->sc_genid); 843 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 844 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 845 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 846 disk->d_genid = sc->sc_genid; 847 g_mirror_update_metadata(disk); 848 } 849 } 850 } 851 852 static int 853 g_mirror_idle(struct g_mirror_softc *sc, int acw) 854 { 855 struct g_mirror_disk *disk; 856 int timeout; 857 858 g_topology_assert_not(); 859 sx_assert(&sc->sc_lock, SX_XLOCKED); 860 861 if (sc->sc_provider == NULL) 862 return (0); 863 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 864 return (0); 865 if (sc->sc_idle) 866 return (0); 867 if (sc->sc_writes > 0) 868 return (0); 869 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 870 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 871 if (!g_mirror_shutdown && timeout > 0) 872 return (timeout); 873 } 874 sc->sc_idle = 1; 875 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 876 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 877 continue; 878 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 879 g_mirror_get_diskname(disk), sc->sc_name); 880 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 881 g_mirror_update_metadata(disk); 882 } 883 return (0); 884 } 885 886 static void 887 g_mirror_unidle(struct g_mirror_softc *sc) 888 { 889 struct g_mirror_disk *disk; 890 891 g_topology_assert_not(); 892 sx_assert(&sc->sc_lock, SX_XLOCKED); 893 894 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 895 return; 896 sc->sc_idle = 0; 897 sc->sc_last_write = time_uptime; 898 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 899 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 900 continue; 901 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 902 g_mirror_get_diskname(disk), sc->sc_name); 903 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 904 g_mirror_update_metadata(disk); 905 } 906 } 907 908 static void 909 g_mirror_done(struct bio *bp) 910 { 911 struct g_mirror_softc *sc; 912 913 sc = bp->bio_from->geom->softc; 914 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 915 mtx_lock(&sc->sc_queue_mtx); 916 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 917 mtx_unlock(&sc->sc_queue_mtx); 918 wakeup(sc); 919 } 920 921 static void 922 g_mirror_regular_request_error(struct g_mirror_softc *sc, 923 struct g_mirror_disk *disk, struct bio *bp) 924 { 925 926 if ((bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) && 927 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 case BIO_SPEEDUP: 991 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_speedup, 992 bp->bio_error); 993 break; 994 } 995 996 pbp->bio_inbed++; 997 KASSERT(pbp->bio_inbed <= pbp->bio_children, 998 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 999 pbp->bio_children)); 1000 if (bp->bio_error == 0 && pbp->bio_error == 0) { 1001 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 1002 g_destroy_bio(bp); 1003 if (pbp->bio_children == pbp->bio_inbed) { 1004 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 1005 pbp->bio_completed = pbp->bio_length; 1006 if (pbp->bio_cmd == BIO_WRITE || 1007 pbp->bio_cmd == BIO_DELETE) { 1008 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1009 /* Release delayed sync requests if possible. */ 1010 g_mirror_sync_release(sc); 1011 } 1012 g_io_deliver(pbp, pbp->bio_error); 1013 } 1014 return; 1015 } else if (bp->bio_error != 0) { 1016 if (pbp->bio_error == 0) 1017 pbp->bio_error = bp->bio_error; 1018 if (disk != NULL) 1019 g_mirror_regular_request_error(sc, disk, bp); 1020 switch (pbp->bio_cmd) { 1021 case BIO_DELETE: 1022 case BIO_WRITE: 1023 case BIO_FLUSH: 1024 case BIO_SPEEDUP: 1025 pbp->bio_inbed--; 1026 pbp->bio_children--; 1027 break; 1028 } 1029 } 1030 g_destroy_bio(bp); 1031 1032 switch (pbp->bio_cmd) { 1033 case BIO_READ: 1034 if (pbp->bio_inbed < pbp->bio_children) 1035 break; 1036 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 1037 g_io_deliver(pbp, pbp->bio_error); 1038 else { 1039 pbp->bio_error = 0; 1040 mtx_lock(&sc->sc_queue_mtx); 1041 TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue); 1042 mtx_unlock(&sc->sc_queue_mtx); 1043 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1044 wakeup(sc); 1045 } 1046 break; 1047 case BIO_DELETE: 1048 case BIO_WRITE: 1049 case BIO_FLUSH: 1050 case BIO_SPEEDUP: 1051 if (pbp->bio_children == 0) { 1052 /* 1053 * All requests failed. 1054 */ 1055 } else if (pbp->bio_inbed < pbp->bio_children) { 1056 /* Do nothing. */ 1057 break; 1058 } else if (pbp->bio_children == pbp->bio_inbed) { 1059 /* Some requests succeeded. */ 1060 pbp->bio_error = 0; 1061 pbp->bio_completed = pbp->bio_length; 1062 } 1063 if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) { 1064 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1065 /* Release delayed sync requests if possible. */ 1066 g_mirror_sync_release(sc); 1067 } 1068 g_io_deliver(pbp, pbp->bio_error); 1069 break; 1070 default: 1071 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1072 break; 1073 } 1074 } 1075 1076 static void 1077 g_mirror_sync_done(struct bio *bp) 1078 { 1079 struct g_mirror_softc *sc; 1080 1081 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1082 sc = bp->bio_from->geom->softc; 1083 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1084 mtx_lock(&sc->sc_queue_mtx); 1085 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1086 mtx_unlock(&sc->sc_queue_mtx); 1087 wakeup(sc); 1088 } 1089 1090 static void 1091 g_mirror_candelete(struct bio *bp) 1092 { 1093 struct g_mirror_softc *sc; 1094 struct g_mirror_disk *disk; 1095 int val; 1096 1097 sc = bp->bio_to->private; 1098 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1099 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1100 break; 1101 } 1102 val = disk != NULL; 1103 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val)); 1104 } 1105 1106 static void 1107 g_mirror_kernel_dump(struct bio *bp) 1108 { 1109 struct g_mirror_softc *sc; 1110 struct g_mirror_disk *disk; 1111 struct bio *cbp; 1112 struct g_kerneldump *gkd; 1113 1114 /* 1115 * We configure dumping to the first component, because this component 1116 * will be used for reading with 'prefer' balance algorithm. 1117 * If the component with the highest priority is currently disconnected 1118 * we will not be able to read the dump after the reboot if it will be 1119 * connected and synchronized later. Can we do something better? 1120 */ 1121 sc = bp->bio_to->private; 1122 disk = LIST_FIRST(&sc->sc_disks); 1123 1124 gkd = (struct g_kerneldump *)bp->bio_data; 1125 if (gkd->length > bp->bio_to->mediasize) 1126 gkd->length = bp->bio_to->mediasize; 1127 cbp = g_clone_bio(bp); 1128 if (cbp == NULL) { 1129 g_io_deliver(bp, ENOMEM); 1130 return; 1131 } 1132 cbp->bio_done = g_std_done; 1133 g_io_request(cbp, disk->d_consumer); 1134 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1135 g_mirror_get_diskname(disk)); 1136 } 1137 1138 static void 1139 g_mirror_start(struct bio *bp) 1140 { 1141 struct g_mirror_softc *sc; 1142 1143 sc = bp->bio_to->private; 1144 /* 1145 * If sc == NULL or there are no valid disks, provider's error 1146 * should be set and g_mirror_start() should not be called at all. 1147 */ 1148 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1149 ("Provider's error should be set (error=%d)(mirror=%s).", 1150 bp->bio_to->error, bp->bio_to->name)); 1151 G_MIRROR_LOGREQ(3, bp, "Request received."); 1152 1153 switch (bp->bio_cmd) { 1154 case BIO_READ: 1155 case BIO_WRITE: 1156 case BIO_DELETE: 1157 case BIO_SPEEDUP: 1158 case BIO_FLUSH: 1159 break; 1160 case BIO_GETATTR: 1161 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1162 g_mirror_candelete(bp); 1163 return; 1164 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1165 g_mirror_kernel_dump(bp); 1166 return; 1167 } 1168 /* FALLTHROUGH */ 1169 default: 1170 g_io_deliver(bp, EOPNOTSUPP); 1171 return; 1172 } 1173 mtx_lock(&sc->sc_queue_mtx); 1174 if (bp->bio_to->error != 0) { 1175 mtx_unlock(&sc->sc_queue_mtx); 1176 g_io_deliver(bp, bp->bio_to->error); 1177 return; 1178 } 1179 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1180 mtx_unlock(&sc->sc_queue_mtx); 1181 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1182 wakeup(sc); 1183 } 1184 1185 /* 1186 * Return TRUE if the given request is colliding with a in-progress 1187 * synchronization request. 1188 */ 1189 static bool 1190 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1191 { 1192 struct g_mirror_disk *disk; 1193 struct bio *sbp; 1194 off_t rstart, rend, sstart, send; 1195 u_int i; 1196 1197 if (sc->sc_sync.ds_ndisks == 0) 1198 return (false); 1199 rstart = bp->bio_offset; 1200 rend = bp->bio_offset + bp->bio_length; 1201 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1202 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1203 continue; 1204 for (i = 0; i < g_mirror_syncreqs; i++) { 1205 sbp = disk->d_sync.ds_bios[i]; 1206 if (sbp == NULL) 1207 continue; 1208 sstart = sbp->bio_offset; 1209 send = sbp->bio_offset + sbp->bio_length; 1210 if (rend > sstart && rstart < send) 1211 return (true); 1212 } 1213 } 1214 return (false); 1215 } 1216 1217 /* 1218 * Return TRUE if the given sync request is colliding with a in-progress regular 1219 * request. 1220 */ 1221 static bool 1222 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1223 { 1224 off_t rstart, rend, sstart, send; 1225 struct bio *bp; 1226 1227 if (sc->sc_sync.ds_ndisks == 0) 1228 return (false); 1229 sstart = sbp->bio_offset; 1230 send = sbp->bio_offset + sbp->bio_length; 1231 TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) { 1232 rstart = bp->bio_offset; 1233 rend = bp->bio_offset + bp->bio_length; 1234 if (rend > sstart && rstart < send) 1235 return (true); 1236 } 1237 return (false); 1238 } 1239 1240 /* 1241 * Puts regular request onto delayed queue. 1242 */ 1243 static void 1244 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1245 { 1246 1247 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1248 TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue); 1249 } 1250 1251 /* 1252 * Puts synchronization request onto delayed queue. 1253 */ 1254 static void 1255 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1256 { 1257 1258 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1259 TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue); 1260 } 1261 1262 /* 1263 * Requeue delayed regular requests. 1264 */ 1265 static void 1266 g_mirror_regular_release(struct g_mirror_softc *sc) 1267 { 1268 struct bio *bp; 1269 1270 if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL) 1271 return; 1272 if (g_mirror_sync_collision(sc, bp)) 1273 return; 1274 1275 G_MIRROR_DEBUG(2, "Requeuing regular requests after collision."); 1276 mtx_lock(&sc->sc_queue_mtx); 1277 TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue); 1278 TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue); 1279 mtx_unlock(&sc->sc_queue_mtx); 1280 } 1281 1282 /* 1283 * Releases delayed sync requests which don't collide anymore with regular 1284 * requests. 1285 */ 1286 static void 1287 g_mirror_sync_release(struct g_mirror_softc *sc) 1288 { 1289 struct bio *bp, *bp2; 1290 1291 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) { 1292 if (g_mirror_regular_collision(sc, bp)) 1293 continue; 1294 TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue); 1295 G_MIRROR_LOGREQ(2, bp, 1296 "Releasing delayed synchronization request."); 1297 g_io_request(bp, bp->bio_from); 1298 } 1299 } 1300 1301 /* 1302 * Free a synchronization request and clear its slot in the array. 1303 */ 1304 static void 1305 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) 1306 { 1307 int idx; 1308 1309 if (disk != NULL && disk->d_sync.ds_bios != NULL) { 1310 idx = (int)(uintptr_t)bp->bio_caller1; 1311 KASSERT(disk->d_sync.ds_bios[idx] == bp, 1312 ("unexpected sync BIO at %p:%d", disk, idx)); 1313 disk->d_sync.ds_bios[idx] = NULL; 1314 } 1315 free(bp->bio_data, M_MIRROR); 1316 g_destroy_bio(bp); 1317 } 1318 1319 /* 1320 * Handle synchronization requests. 1321 * Every synchronization request is a two-step process: first, a read request is 1322 * sent to the mirror provider via the sync consumer. If that request completes 1323 * successfully, it is converted to a write and sent to the disk being 1324 * synchronized. If the write also completes successfully, the synchronization 1325 * offset is advanced and a new read request is submitted. 1326 */ 1327 static void 1328 g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp) 1329 { 1330 struct g_mirror_disk *disk; 1331 struct g_mirror_disk_sync *sync; 1332 1333 KASSERT((bp->bio_cmd == BIO_READ && 1334 bp->bio_from->geom == sc->sc_sync.ds_geom) || 1335 (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom), 1336 ("Sync BIO %p with unexpected origin", bp)); 1337 1338 bp->bio_from->index--; 1339 disk = bp->bio_from->private; 1340 if (disk == NULL) { 1341 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1342 g_topology_lock(); 1343 g_mirror_kill_consumer(sc, bp->bio_from); 1344 g_topology_unlock(); 1345 g_mirror_sync_request_free(NULL, bp); 1346 sx_xlock(&sc->sc_lock); 1347 return; 1348 } 1349 1350 sync = &disk->d_sync; 1351 1352 /* 1353 * Synchronization request. 1354 */ 1355 switch (bp->bio_cmd) { 1356 case BIO_READ: { 1357 struct g_consumer *cp; 1358 1359 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, 1360 bp->bio_error); 1361 1362 if (bp->bio_error != 0) { 1363 G_MIRROR_LOGREQ(0, bp, 1364 "Synchronization request failed (error=%d).", 1365 bp->bio_error); 1366 1367 /* 1368 * The read error will trigger a syncid bump, so there's 1369 * no need to do that here. 1370 * 1371 * The read error handling for regular requests will 1372 * retry the read from all active mirrors before passing 1373 * the error back up, so there's no need to retry here. 1374 */ 1375 g_mirror_sync_request_free(disk, bp); 1376 g_mirror_event_send(disk, 1377 G_MIRROR_DISK_STATE_DISCONNECTED, 1378 G_MIRROR_EVENT_DONTWAIT); 1379 return; 1380 } 1381 G_MIRROR_LOGREQ(3, bp, 1382 "Synchronization request half-finished."); 1383 bp->bio_cmd = BIO_WRITE; 1384 bp->bio_cflags = 0; 1385 cp = disk->d_consumer; 1386 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1387 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1388 cp->acr, cp->acw, cp->ace)); 1389 cp->index++; 1390 g_io_request(bp, cp); 1391 return; 1392 } 1393 case BIO_WRITE: { 1394 off_t offset; 1395 int i; 1396 1397 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, 1398 bp->bio_error); 1399 1400 if (bp->bio_error != 0) { 1401 G_MIRROR_LOGREQ(0, bp, 1402 "Synchronization request failed (error=%d).", 1403 bp->bio_error); 1404 g_mirror_sync_request_free(disk, bp); 1405 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1406 g_mirror_event_send(disk, 1407 G_MIRROR_DISK_STATE_DISCONNECTED, 1408 G_MIRROR_EVENT_DONTWAIT); 1409 return; 1410 } 1411 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1412 if (sync->ds_offset >= sc->sc_mediasize || 1413 sync->ds_consumer == NULL || 1414 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1415 /* Don't send more synchronization requests. */ 1416 sync->ds_inflight--; 1417 g_mirror_sync_request_free(disk, bp); 1418 if (sync->ds_inflight > 0) 1419 return; 1420 if (sync->ds_consumer == NULL || 1421 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1422 return; 1423 } 1424 /* Disk up-to-date, activate it. */ 1425 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1426 G_MIRROR_EVENT_DONTWAIT); 1427 return; 1428 } 1429 1430 /* Send next synchronization request. */ 1431 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 1432 sync->ds_offset += bp->bio_length; 1433 1434 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1435 sync->ds_consumer->index++; 1436 1437 /* 1438 * Delay the request if it is colliding with a regular request. 1439 */ 1440 if (g_mirror_regular_collision(sc, bp)) 1441 g_mirror_sync_delay(sc, bp); 1442 else 1443 g_io_request(bp, sync->ds_consumer); 1444 1445 /* Requeue delayed requests if possible. */ 1446 g_mirror_regular_release(sc); 1447 1448 /* Find the smallest offset */ 1449 offset = sc->sc_mediasize; 1450 for (i = 0; i < g_mirror_syncreqs; i++) { 1451 bp = sync->ds_bios[i]; 1452 if (bp != NULL && bp->bio_offset < offset) 1453 offset = bp->bio_offset; 1454 } 1455 if (g_mirror_sync_period > 0 && 1456 time_uptime - sync->ds_update_ts > g_mirror_sync_period) { 1457 sync->ds_offset_done = offset; 1458 g_mirror_update_metadata(disk); 1459 sync->ds_update_ts = time_uptime; 1460 } 1461 return; 1462 } 1463 default: 1464 panic("Invalid I/O request %p", bp); 1465 } 1466 } 1467 1468 static void 1469 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1470 { 1471 struct g_mirror_disk *disk; 1472 struct g_consumer *cp; 1473 struct bio *cbp; 1474 1475 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1476 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1477 break; 1478 } 1479 if (disk == NULL) { 1480 if (bp->bio_error == 0) 1481 bp->bio_error = ENXIO; 1482 g_io_deliver(bp, bp->bio_error); 1483 return; 1484 } 1485 cbp = g_clone_bio(bp); 1486 if (cbp == NULL) { 1487 if (bp->bio_error == 0) 1488 bp->bio_error = ENOMEM; 1489 g_io_deliver(bp, bp->bio_error); 1490 return; 1491 } 1492 /* 1493 * Fill in the component buf structure. 1494 */ 1495 cp = disk->d_consumer; 1496 cbp->bio_done = g_mirror_done; 1497 cbp->bio_to = cp->provider; 1498 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1499 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1500 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1501 cp->acw, cp->ace)); 1502 cp->index++; 1503 g_io_request(cbp, cp); 1504 } 1505 1506 static void 1507 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1508 { 1509 struct g_mirror_disk *disk; 1510 struct g_consumer *cp; 1511 struct bio *cbp; 1512 1513 disk = g_mirror_get_disk(sc); 1514 if (disk == NULL) { 1515 if (bp->bio_error == 0) 1516 bp->bio_error = ENXIO; 1517 g_io_deliver(bp, bp->bio_error); 1518 return; 1519 } 1520 cbp = g_clone_bio(bp); 1521 if (cbp == NULL) { 1522 if (bp->bio_error == 0) 1523 bp->bio_error = ENOMEM; 1524 g_io_deliver(bp, bp->bio_error); 1525 return; 1526 } 1527 /* 1528 * Fill in the component buf structure. 1529 */ 1530 cp = disk->d_consumer; 1531 cbp->bio_done = g_mirror_done; 1532 cbp->bio_to = cp->provider; 1533 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1534 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1535 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1536 cp->acw, cp->ace)); 1537 cp->index++; 1538 g_io_request(cbp, cp); 1539 } 1540 1541 #define TRACK_SIZE (1 * 1024 * 1024) 1542 #define LOAD_SCALE 256 1543 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1544 1545 static void 1546 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1547 { 1548 struct g_mirror_disk *disk, *dp; 1549 struct g_consumer *cp; 1550 struct bio *cbp; 1551 int prio, best; 1552 1553 /* Find a disk with the smallest load. */ 1554 disk = NULL; 1555 best = INT_MAX; 1556 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1557 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1558 continue; 1559 prio = dp->load; 1560 /* If disk head is precisely in position - highly prefer it. */ 1561 if (dp->d_last_offset == bp->bio_offset) 1562 prio -= 2 * LOAD_SCALE; 1563 else 1564 /* If disk head is close to position - prefer it. */ 1565 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1566 prio -= 1 * LOAD_SCALE; 1567 if (prio <= best) { 1568 disk = dp; 1569 best = prio; 1570 } 1571 } 1572 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1573 cbp = g_clone_bio(bp); 1574 if (cbp == NULL) { 1575 if (bp->bio_error == 0) 1576 bp->bio_error = ENOMEM; 1577 g_io_deliver(bp, bp->bio_error); 1578 return; 1579 } 1580 /* 1581 * Fill in the component buf structure. 1582 */ 1583 cp = disk->d_consumer; 1584 cbp->bio_done = g_mirror_done; 1585 cbp->bio_to = cp->provider; 1586 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1587 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1588 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1589 cp->acw, cp->ace)); 1590 cp->index++; 1591 /* Remember last head position */ 1592 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1593 /* Update loads. */ 1594 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1595 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1596 dp->load * 7) / 8; 1597 } 1598 g_io_request(cbp, cp); 1599 } 1600 1601 static void 1602 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1603 { 1604 struct bio_queue queue; 1605 struct g_mirror_disk *disk; 1606 struct g_consumer *cp; 1607 struct bio *cbp; 1608 off_t left, mod, offset, slice; 1609 u_char *data; 1610 u_int ndisks; 1611 1612 if (bp->bio_length <= sc->sc_slice) { 1613 g_mirror_request_round_robin(sc, bp); 1614 return; 1615 } 1616 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1617 slice = bp->bio_length / ndisks; 1618 mod = slice % sc->sc_provider->sectorsize; 1619 if (mod != 0) 1620 slice += sc->sc_provider->sectorsize - mod; 1621 /* 1622 * Allocate all bios before sending any request, so we can 1623 * return ENOMEM in nice and clean way. 1624 */ 1625 left = bp->bio_length; 1626 offset = bp->bio_offset; 1627 data = bp->bio_data; 1628 TAILQ_INIT(&queue); 1629 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1630 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1631 continue; 1632 cbp = g_clone_bio(bp); 1633 if (cbp == NULL) { 1634 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1635 TAILQ_REMOVE(&queue, cbp, bio_queue); 1636 g_destroy_bio(cbp); 1637 } 1638 if (bp->bio_error == 0) 1639 bp->bio_error = ENOMEM; 1640 g_io_deliver(bp, bp->bio_error); 1641 return; 1642 } 1643 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1644 cbp->bio_done = g_mirror_done; 1645 cbp->bio_caller1 = disk; 1646 cbp->bio_to = disk->d_consumer->provider; 1647 cbp->bio_offset = offset; 1648 cbp->bio_data = data; 1649 cbp->bio_length = MIN(left, slice); 1650 left -= cbp->bio_length; 1651 if (left == 0) 1652 break; 1653 offset += cbp->bio_length; 1654 data += cbp->bio_length; 1655 } 1656 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1657 TAILQ_REMOVE(&queue, cbp, bio_queue); 1658 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1659 disk = cbp->bio_caller1; 1660 cbp->bio_caller1 = NULL; 1661 cp = disk->d_consumer; 1662 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1663 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1664 cp->acr, cp->acw, cp->ace)); 1665 disk->d_consumer->index++; 1666 g_io_request(cbp, disk->d_consumer); 1667 } 1668 } 1669 1670 static void 1671 g_mirror_register_request(struct g_mirror_softc *sc, struct bio *bp) 1672 { 1673 struct bio_queue queue; 1674 struct bio *cbp; 1675 struct g_consumer *cp; 1676 struct g_mirror_disk *disk; 1677 1678 sx_assert(&sc->sc_lock, SA_XLOCKED); 1679 1680 /* 1681 * To avoid ordering issues, if a write is deferred because of a 1682 * collision with a sync request, all I/O is deferred until that 1683 * write is initiated. 1684 */ 1685 if (bp->bio_from->geom != sc->sc_sync.ds_geom && 1686 !TAILQ_EMPTY(&sc->sc_regular_delayed)) { 1687 g_mirror_regular_delay(sc, bp); 1688 return; 1689 } 1690 1691 switch (bp->bio_cmd) { 1692 case BIO_READ: 1693 switch (sc->sc_balance) { 1694 case G_MIRROR_BALANCE_LOAD: 1695 g_mirror_request_load(sc, bp); 1696 break; 1697 case G_MIRROR_BALANCE_PREFER: 1698 g_mirror_request_prefer(sc, bp); 1699 break; 1700 case G_MIRROR_BALANCE_ROUND_ROBIN: 1701 g_mirror_request_round_robin(sc, bp); 1702 break; 1703 case G_MIRROR_BALANCE_SPLIT: 1704 g_mirror_request_split(sc, bp); 1705 break; 1706 } 1707 return; 1708 case BIO_WRITE: 1709 case BIO_DELETE: 1710 /* 1711 * Delay the request if it is colliding with a synchronization 1712 * request. 1713 */ 1714 if (g_mirror_sync_collision(sc, bp)) { 1715 g_mirror_regular_delay(sc, bp); 1716 return; 1717 } 1718 1719 if (sc->sc_idle) 1720 g_mirror_unidle(sc); 1721 else 1722 sc->sc_last_write = time_uptime; 1723 1724 /* 1725 * Bump syncid on first write. 1726 */ 1727 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1728 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1729 g_mirror_bump_syncid(sc); 1730 } 1731 1732 /* 1733 * Allocate all bios before sending any request, so we can 1734 * return ENOMEM in nice and clean way. 1735 */ 1736 TAILQ_INIT(&queue); 1737 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1738 switch (disk->d_state) { 1739 case G_MIRROR_DISK_STATE_ACTIVE: 1740 break; 1741 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1742 if (bp->bio_offset >= disk->d_sync.ds_offset) 1743 continue; 1744 break; 1745 default: 1746 continue; 1747 } 1748 if (bp->bio_cmd == BIO_DELETE && 1749 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1750 continue; 1751 cbp = g_clone_bio(bp); 1752 if (cbp == NULL) { 1753 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1754 TAILQ_REMOVE(&queue, cbp, bio_queue); 1755 g_destroy_bio(cbp); 1756 } 1757 if (bp->bio_error == 0) 1758 bp->bio_error = ENOMEM; 1759 g_io_deliver(bp, bp->bio_error); 1760 return; 1761 } 1762 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1763 cbp->bio_done = g_mirror_done; 1764 cp = disk->d_consumer; 1765 cbp->bio_caller1 = cp; 1766 cbp->bio_to = cp->provider; 1767 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1768 ("Consumer %s not opened (r%dw%de%d).", 1769 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1770 } 1771 if (TAILQ_EMPTY(&queue)) { 1772 KASSERT(bp->bio_cmd == BIO_DELETE, 1773 ("No consumers for regular request %p", bp)); 1774 g_io_deliver(bp, EOPNOTSUPP); 1775 return; 1776 } 1777 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1778 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1779 TAILQ_REMOVE(&queue, cbp, bio_queue); 1780 cp = cbp->bio_caller1; 1781 cbp->bio_caller1 = NULL; 1782 cp->index++; 1783 sc->sc_writes++; 1784 g_io_request(cbp, cp); 1785 } 1786 /* 1787 * Put request onto inflight queue, so we can check if new 1788 * synchronization requests don't collide with it. 1789 */ 1790 TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue); 1791 return; 1792 case BIO_SPEEDUP: 1793 case BIO_FLUSH: 1794 TAILQ_INIT(&queue); 1795 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1796 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1797 continue; 1798 cbp = g_clone_bio(bp); 1799 if (cbp == NULL) { 1800 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1801 TAILQ_REMOVE(&queue, cbp, bio_queue); 1802 g_destroy_bio(cbp); 1803 } 1804 if (bp->bio_error == 0) 1805 bp->bio_error = ENOMEM; 1806 g_io_deliver(bp, bp->bio_error); 1807 return; 1808 } 1809 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1810 cbp->bio_done = g_mirror_done; 1811 cbp->bio_caller1 = disk; 1812 cbp->bio_to = disk->d_consumer->provider; 1813 } 1814 KASSERT(!TAILQ_EMPTY(&queue), 1815 ("No consumers for regular request %p", bp)); 1816 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1817 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1818 TAILQ_REMOVE(&queue, cbp, bio_queue); 1819 disk = cbp->bio_caller1; 1820 cbp->bio_caller1 = NULL; 1821 cp = disk->d_consumer; 1822 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1823 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1824 cp->acr, cp->acw, cp->ace)); 1825 cp->index++; 1826 g_io_request(cbp, cp); 1827 } 1828 break; 1829 default: 1830 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1831 bp->bio_cmd, sc->sc_name)); 1832 break; 1833 } 1834 } 1835 1836 static int 1837 g_mirror_can_destroy(struct g_mirror_softc *sc) 1838 { 1839 struct g_geom *gp; 1840 struct g_consumer *cp; 1841 1842 g_topology_assert(); 1843 gp = sc->sc_geom; 1844 if (gp->softc == NULL) 1845 return (1); 1846 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1847 return (0); 1848 LIST_FOREACH(cp, &gp->consumer, consumer) { 1849 if (g_mirror_is_busy(sc, cp)) 1850 return (0); 1851 } 1852 gp = sc->sc_sync.ds_geom; 1853 LIST_FOREACH(cp, &gp->consumer, consumer) { 1854 if (g_mirror_is_busy(sc, cp)) 1855 return (0); 1856 } 1857 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1858 sc->sc_name); 1859 return (1); 1860 } 1861 1862 static int 1863 g_mirror_try_destroy(struct g_mirror_softc *sc) 1864 { 1865 1866 if (sc->sc_rootmount != NULL) { 1867 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1868 sc->sc_rootmount); 1869 root_mount_rel(sc->sc_rootmount); 1870 sc->sc_rootmount = NULL; 1871 } 1872 g_topology_lock(); 1873 if (!g_mirror_can_destroy(sc)) { 1874 g_topology_unlock(); 1875 return (0); 1876 } 1877 sc->sc_geom->softc = NULL; 1878 sc->sc_sync.ds_geom->softc = NULL; 1879 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) { 1880 g_topology_unlock(); 1881 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1882 &sc->sc_worker); 1883 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1884 sx_xunlock(&sc->sc_lock); 1885 wakeup(&sc->sc_worker); 1886 sc->sc_worker = NULL; 1887 } else { 1888 g_topology_unlock(); 1889 g_mirror_destroy_device(sc); 1890 } 1891 return (1); 1892 } 1893 1894 /* 1895 * Worker thread. 1896 */ 1897 static void 1898 g_mirror_worker(void *arg) 1899 { 1900 struct g_mirror_softc *sc; 1901 struct g_mirror_event *ep; 1902 struct bio *bp; 1903 int timeout; 1904 1905 sc = arg; 1906 thread_lock(curthread); 1907 sched_prio(curthread, PRIBIO); 1908 thread_unlock(curthread); 1909 1910 sx_xlock(&sc->sc_lock); 1911 for (;;) { 1912 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1913 /* 1914 * First take a look at events. 1915 * This is important to handle events before any I/O requests. 1916 */ 1917 ep = g_mirror_event_first(sc); 1918 if (ep != NULL) { 1919 g_mirror_event_remove(sc, ep); 1920 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1921 /* Update only device status. */ 1922 G_MIRROR_DEBUG(3, 1923 "Running event for device %s.", 1924 sc->sc_name); 1925 ep->e_error = 0; 1926 g_mirror_update_device(sc, true); 1927 } else { 1928 /* Update disk status. */ 1929 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1930 g_mirror_get_diskname(ep->e_disk)); 1931 ep->e_error = g_mirror_update_disk(ep->e_disk, 1932 ep->e_state); 1933 if (ep->e_error == 0) 1934 g_mirror_update_device(sc, false); 1935 } 1936 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1937 KASSERT(ep->e_error == 0, 1938 ("Error cannot be handled.")); 1939 g_mirror_event_free(ep); 1940 } else { 1941 ep->e_flags |= G_MIRROR_EVENT_DONE; 1942 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1943 ep); 1944 mtx_lock(&sc->sc_events_mtx); 1945 wakeup(ep); 1946 mtx_unlock(&sc->sc_events_mtx); 1947 } 1948 if ((sc->sc_flags & 1949 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1950 if (g_mirror_try_destroy(sc)) { 1951 curthread->td_pflags &= ~TDP_GEOM; 1952 G_MIRROR_DEBUG(1, "Thread exiting."); 1953 kproc_exit(0); 1954 } 1955 } 1956 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1957 continue; 1958 } 1959 1960 /* 1961 * Check if we can mark array as CLEAN and if we can't take 1962 * how much seconds should we wait. 1963 */ 1964 timeout = g_mirror_idle(sc, -1); 1965 1966 /* 1967 * Handle I/O requests. 1968 */ 1969 mtx_lock(&sc->sc_queue_mtx); 1970 bp = TAILQ_FIRST(&sc->sc_queue); 1971 if (bp != NULL) 1972 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 1973 else { 1974 if ((sc->sc_flags & 1975 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1976 mtx_unlock(&sc->sc_queue_mtx); 1977 if (g_mirror_try_destroy(sc)) { 1978 curthread->td_pflags &= ~TDP_GEOM; 1979 G_MIRROR_DEBUG(1, "Thread exiting."); 1980 kproc_exit(0); 1981 } 1982 mtx_lock(&sc->sc_queue_mtx); 1983 if (!TAILQ_EMPTY(&sc->sc_queue)) { 1984 mtx_unlock(&sc->sc_queue_mtx); 1985 continue; 1986 } 1987 } 1988 if (g_mirror_event_first(sc) != NULL) { 1989 mtx_unlock(&sc->sc_queue_mtx); 1990 continue; 1991 } 1992 sx_xunlock(&sc->sc_lock); 1993 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1994 timeout * hz); 1995 sx_xlock(&sc->sc_lock); 1996 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1997 continue; 1998 } 1999 mtx_unlock(&sc->sc_queue_mtx); 2000 2001 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 2002 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 2003 /* 2004 * Handle completion of the first half (the read) of a 2005 * block synchronization operation. 2006 */ 2007 g_mirror_sync_request(sc, bp); 2008 } else if (bp->bio_to != sc->sc_provider) { 2009 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 2010 /* 2011 * Handle completion of a regular I/O request. 2012 */ 2013 g_mirror_regular_request(sc, bp); 2014 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2015 /* 2016 * Handle completion of the second half (the 2017 * write) of a block synchronization operation. 2018 */ 2019 g_mirror_sync_request(sc, bp); 2020 else { 2021 KASSERT(0, 2022 ("Invalid request cflags=0x%hx to=%s.", 2023 bp->bio_cflags, bp->bio_to->name)); 2024 } 2025 } else { 2026 /* 2027 * Initiate an I/O request. 2028 */ 2029 g_mirror_register_request(sc, bp); 2030 } 2031 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 2032 } 2033 } 2034 2035 static void 2036 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 2037 { 2038 2039 sx_assert(&sc->sc_lock, SX_LOCKED); 2040 2041 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 2042 return; 2043 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2044 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 2045 g_mirror_get_diskname(disk), sc->sc_name); 2046 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2047 } else if (sc->sc_idle && 2048 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2049 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 2050 g_mirror_get_diskname(disk), sc->sc_name); 2051 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2052 } 2053 } 2054 2055 static void 2056 g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp, 2057 off_t offset) 2058 { 2059 void *data; 2060 int idx; 2061 2062 data = bp->bio_data; 2063 idx = (int)(uintptr_t)bp->bio_caller1; 2064 g_reset_bio(bp); 2065 2066 bp->bio_cmd = BIO_READ; 2067 bp->bio_data = data; 2068 bp->bio_done = g_mirror_sync_done; 2069 bp->bio_from = disk->d_sync.ds_consumer; 2070 bp->bio_to = disk->d_softc->sc_provider; 2071 bp->bio_caller1 = (void *)(uintptr_t)idx; 2072 bp->bio_offset = offset; 2073 bp->bio_length = MIN(MAXPHYS, 2074 disk->d_softc->sc_mediasize - bp->bio_offset); 2075 } 2076 2077 static void 2078 g_mirror_sync_start(struct g_mirror_disk *disk) 2079 { 2080 struct g_mirror_softc *sc; 2081 struct g_mirror_disk_sync *sync; 2082 struct g_consumer *cp; 2083 struct bio *bp; 2084 int error, i; 2085 2086 g_topology_assert_not(); 2087 sc = disk->d_softc; 2088 sync = &disk->d_sync; 2089 sx_assert(&sc->sc_lock, SX_LOCKED); 2090 2091 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2092 ("Disk %s is not marked for synchronization.", 2093 g_mirror_get_diskname(disk))); 2094 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2095 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 2096 sc->sc_state)); 2097 2098 sx_xunlock(&sc->sc_lock); 2099 g_topology_lock(); 2100 cp = g_new_consumer(sc->sc_sync.ds_geom); 2101 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2102 error = g_attach(cp, sc->sc_provider); 2103 KASSERT(error == 0, 2104 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 2105 error = g_access(cp, 1, 0, 0); 2106 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 2107 g_topology_unlock(); 2108 sx_xlock(&sc->sc_lock); 2109 2110 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2111 g_mirror_get_diskname(disk)); 2112 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2113 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2114 KASSERT(sync->ds_consumer == NULL, 2115 ("Sync consumer already exists (device=%s, disk=%s).", 2116 sc->sc_name, g_mirror_get_diskname(disk))); 2117 2118 sync->ds_consumer = cp; 2119 sync->ds_consumer->private = disk; 2120 sync->ds_consumer->index = 0; 2121 2122 /* 2123 * Allocate memory for synchronization bios and initialize them. 2124 */ 2125 sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2126 M_MIRROR, M_WAITOK); 2127 for (i = 0; i < g_mirror_syncreqs; i++) { 2128 bp = g_alloc_bio(); 2129 sync->ds_bios[i] = bp; 2130 2131 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 2132 bp->bio_caller1 = (void *)(uintptr_t)i; 2133 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 2134 sync->ds_offset += bp->bio_length; 2135 } 2136 2137 /* Increase the number of disks in SYNCHRONIZING state. */ 2138 sc->sc_sync.ds_ndisks++; 2139 /* Set the number of in-flight synchronization requests. */ 2140 sync->ds_inflight = g_mirror_syncreqs; 2141 2142 /* 2143 * Fire off first synchronization requests. 2144 */ 2145 for (i = 0; i < g_mirror_syncreqs; i++) { 2146 bp = sync->ds_bios[i]; 2147 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2148 sync->ds_consumer->index++; 2149 /* 2150 * Delay the request if it is colliding with a regular request. 2151 */ 2152 if (g_mirror_regular_collision(sc, bp)) 2153 g_mirror_sync_delay(sc, bp); 2154 else 2155 g_io_request(bp, sync->ds_consumer); 2156 } 2157 } 2158 2159 /* 2160 * Stop synchronization process. 2161 * type: 0 - synchronization finished 2162 * 1 - synchronization stopped 2163 */ 2164 static void 2165 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2166 { 2167 struct g_mirror_softc *sc; 2168 struct g_consumer *cp; 2169 2170 g_topology_assert_not(); 2171 sc = disk->d_softc; 2172 sx_assert(&sc->sc_lock, SX_LOCKED); 2173 2174 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2175 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2176 g_mirror_disk_state2str(disk->d_state))); 2177 if (disk->d_sync.ds_consumer == NULL) 2178 return; 2179 2180 if (type == 0) { 2181 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2182 sc->sc_name, g_mirror_get_diskname(disk)); 2183 } else /* if (type == 1) */ { 2184 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2185 sc->sc_name, g_mirror_get_diskname(disk)); 2186 } 2187 g_mirror_regular_release(sc); 2188 free(disk->d_sync.ds_bios, M_MIRROR); 2189 disk->d_sync.ds_bios = NULL; 2190 cp = disk->d_sync.ds_consumer; 2191 disk->d_sync.ds_consumer = NULL; 2192 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2193 sc->sc_sync.ds_ndisks--; 2194 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2195 g_topology_lock(); 2196 g_mirror_kill_consumer(sc, cp); 2197 g_topology_unlock(); 2198 sx_xlock(&sc->sc_lock); 2199 } 2200 2201 static void 2202 g_mirror_launch_provider(struct g_mirror_softc *sc) 2203 { 2204 struct g_mirror_disk *disk; 2205 struct g_provider *pp, *dp; 2206 2207 sx_assert(&sc->sc_lock, SX_LOCKED); 2208 2209 g_topology_lock(); 2210 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2211 pp->flags |= G_PF_DIRECT_RECEIVE; 2212 pp->mediasize = sc->sc_mediasize; 2213 pp->sectorsize = sc->sc_sectorsize; 2214 pp->stripesize = 0; 2215 pp->stripeoffset = 0; 2216 2217 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2218 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2219 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2220 2221 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2222 if (disk->d_consumer && disk->d_consumer->provider) { 2223 dp = disk->d_consumer->provider; 2224 if (dp->stripesize > pp->stripesize) { 2225 pp->stripesize = dp->stripesize; 2226 pp->stripeoffset = dp->stripeoffset; 2227 } 2228 /* A provider underneath us doesn't support unmapped */ 2229 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2230 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2231 "because of %s.", dp->name); 2232 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2233 } 2234 } 2235 } 2236 pp->private = sc; 2237 sc->sc_refcnt++; 2238 sc->sc_provider = pp; 2239 g_error_provider(pp, 0); 2240 g_topology_unlock(); 2241 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2242 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2243 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2244 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2245 g_mirror_sync_start(disk); 2246 } 2247 } 2248 2249 static void 2250 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2251 { 2252 struct g_mirror_disk *disk; 2253 struct bio *bp; 2254 2255 g_topology_assert_not(); 2256 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2257 sc->sc_name)); 2258 2259 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2260 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2261 g_mirror_sync_stop(disk, 1); 2262 } 2263 2264 g_topology_lock(); 2265 g_error_provider(sc->sc_provider, ENXIO); 2266 mtx_lock(&sc->sc_queue_mtx); 2267 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 2268 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 2269 /* 2270 * Abort any pending I/O that wasn't generated by us. 2271 * Synchronization requests and requests destined for individual 2272 * mirror components can be destroyed immediately. 2273 */ 2274 if (bp->bio_to == sc->sc_provider && 2275 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2276 g_io_deliver(bp, ENXIO); 2277 } else { 2278 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2279 free(bp->bio_data, M_MIRROR); 2280 g_destroy_bio(bp); 2281 } 2282 } 2283 mtx_unlock(&sc->sc_queue_mtx); 2284 g_wither_provider(sc->sc_provider, ENXIO); 2285 sc->sc_provider = NULL; 2286 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2287 g_topology_unlock(); 2288 } 2289 2290 static void 2291 g_mirror_go(void *arg) 2292 { 2293 struct g_mirror_softc *sc; 2294 2295 sc = arg; 2296 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2297 g_mirror_event_send(sc, 0, 2298 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2299 } 2300 2301 static u_int 2302 g_mirror_determine_state(struct g_mirror_disk *disk) 2303 { 2304 struct g_mirror_softc *sc; 2305 u_int state; 2306 2307 sc = disk->d_softc; 2308 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2309 if ((disk->d_flags & 2310 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 && 2311 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || 2312 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { 2313 /* Disk does not need synchronization. */ 2314 state = G_MIRROR_DISK_STATE_ACTIVE; 2315 } else { 2316 if ((sc->sc_flags & 2317 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2318 (disk->d_flags & 2319 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2320 /* 2321 * We can start synchronization from 2322 * the stored offset. 2323 */ 2324 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2325 } else { 2326 state = G_MIRROR_DISK_STATE_STALE; 2327 } 2328 } 2329 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2330 /* 2331 * Reset all synchronization data for this disk, 2332 * because if it even was synchronized, it was 2333 * synchronized to disks with different syncid. 2334 */ 2335 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2336 disk->d_sync.ds_offset = 0; 2337 disk->d_sync.ds_offset_done = 0; 2338 disk->d_sync.ds_syncid = sc->sc_syncid; 2339 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2340 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2341 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2342 } else { 2343 state = G_MIRROR_DISK_STATE_STALE; 2344 } 2345 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2346 /* 2347 * Not good, NOT GOOD! 2348 * It means that mirror was started on stale disks 2349 * and more fresh disk just arrive. 2350 * If there were writes, mirror is broken, sorry. 2351 * I think the best choice here is don't touch 2352 * this disk and inform the user loudly. 2353 */ 2354 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2355 "disk (%s) arrives!! It will not be connected to the " 2356 "running device.", sc->sc_name, 2357 g_mirror_get_diskname(disk)); 2358 g_mirror_destroy_disk(disk); 2359 state = G_MIRROR_DISK_STATE_NONE; 2360 /* Return immediately, because disk was destroyed. */ 2361 return (state); 2362 } 2363 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2364 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2365 return (state); 2366 } 2367 2368 /* 2369 * Update device state. 2370 */ 2371 static void 2372 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2373 { 2374 struct g_mirror_disk *disk; 2375 u_int state; 2376 2377 sx_assert(&sc->sc_lock, SX_XLOCKED); 2378 2379 switch (sc->sc_state) { 2380 case G_MIRROR_DEVICE_STATE_STARTING: 2381 { 2382 struct g_mirror_disk *pdisk, *tdisk; 2383 const char *mismatch; 2384 uintmax_t found, newest; 2385 u_int dirty, ndisks; 2386 2387 /* Pre-flight checks */ 2388 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2389 /* 2390 * Confirm we already detected the newest genid. 2391 */ 2392 KASSERT(sc->sc_genid >= disk->d_genid, 2393 ("%s: found newer genid %u (sc:%p had %u).", __func__, 2394 disk->d_genid, sc, sc->sc_genid)); 2395 2396 /* Kick out any previously tasted stale components. */ 2397 if (disk->d_genid < sc->sc_genid) { 2398 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " 2399 "(device %s) (component=%u latest=%u), skipping.", 2400 g_mirror_get_diskname(disk), sc->sc_name, 2401 disk->d_genid, sc->sc_genid); 2402 g_mirror_destroy_disk(disk); 2403 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2404 continue; 2405 } 2406 2407 /* 2408 * Confirm we already detected the newest syncid. 2409 */ 2410 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, 2411 ("%s: found newer syncid %u (sc:%p had %u).", 2412 __func__, disk->d_sync.ds_syncid, sc, 2413 sc->sc_syncid)); 2414 2415 #define DETECT_MISMATCH(field, name) \ 2416 if (mismatch == NULL && \ 2417 disk->d_init_ ## field != sc->sc_ ## field) { \ 2418 mismatch = name; \ 2419 found = (intmax_t)disk->d_init_ ## field; \ 2420 newest = (intmax_t)sc->sc_ ## field; \ 2421 } 2422 mismatch = NULL; 2423 DETECT_MISMATCH(ndisks, "md_all"); 2424 DETECT_MISMATCH(balance, "md_balance"); 2425 DETECT_MISMATCH(slice, "md_slice"); 2426 DETECT_MISMATCH(mediasize, "md_mediasize"); 2427 #undef DETECT_MISMATCH 2428 if (mismatch != NULL) { 2429 G_MIRROR_DEBUG(0, "Found a mismatching '%s' " 2430 "field on %s (device %s) (found=%ju " 2431 "newest=%ju).", mismatch, 2432 g_mirror_get_diskname(disk), sc->sc_name, 2433 found, newest); 2434 g_mirror_destroy_disk(disk); 2435 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2436 continue; 2437 } 2438 } 2439 2440 KASSERT(sc->sc_provider == NULL, 2441 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2442 /* 2443 * Are we ready? If the timeout (force is true) has expired, and 2444 * any disks are present, then yes. If we're permitted to launch 2445 * before the timeout has expired and the expected number of 2446 * current-generation mirror disks have been tasted, then yes. 2447 */ 2448 ndisks = g_mirror_ndisks(sc, -1); 2449 if ((force && ndisks > 0) || 2450 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { 2451 ; 2452 } else if (ndisks == 0) { 2453 /* 2454 * Disks went down in starting phase, so destroy 2455 * device. 2456 */ 2457 callout_drain(&sc->sc_callout); 2458 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2459 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2460 sc->sc_rootmount); 2461 root_mount_rel(sc->sc_rootmount); 2462 sc->sc_rootmount = NULL; 2463 return; 2464 } else { 2465 return; 2466 } 2467 2468 /* 2469 * Activate all disks with the biggest syncid. 2470 */ 2471 if (force) { 2472 /* 2473 * If 'force' is true, we have been called due to 2474 * timeout, so don't bother canceling timeout. 2475 */ 2476 ndisks = 0; 2477 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2478 if ((disk->d_flags & 2479 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2480 ndisks++; 2481 } 2482 } 2483 if (ndisks == 0) { 2484 /* No valid disks found, destroy device. */ 2485 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2486 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2487 __LINE__, sc->sc_rootmount); 2488 root_mount_rel(sc->sc_rootmount); 2489 sc->sc_rootmount = NULL; 2490 return; 2491 } 2492 } else { 2493 /* Cancel timeout. */ 2494 callout_drain(&sc->sc_callout); 2495 } 2496 2497 /* 2498 * Here we need to look for dirty disks and if all disks 2499 * with the biggest syncid are dirty, we have to choose 2500 * one with the biggest priority and rebuild the rest. 2501 */ 2502 /* 2503 * Find the number of dirty disks with the biggest syncid. 2504 * Find the number of disks with the biggest syncid. 2505 * While here, find a disk with the biggest priority. 2506 */ 2507 dirty = ndisks = 0; 2508 pdisk = NULL; 2509 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2510 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2511 continue; 2512 if ((disk->d_flags & 2513 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2514 continue; 2515 } 2516 ndisks++; 2517 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2518 dirty++; 2519 if (pdisk == NULL || 2520 pdisk->d_priority < disk->d_priority) { 2521 pdisk = disk; 2522 } 2523 } 2524 } 2525 if (dirty == 0) { 2526 /* No dirty disks at all, great. */ 2527 } else if (dirty == ndisks) { 2528 /* 2529 * Force synchronization for all dirty disks except one 2530 * with the biggest priority. 2531 */ 2532 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2533 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2534 "master disk for synchronization.", 2535 g_mirror_get_diskname(pdisk), sc->sc_name); 2536 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2537 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2538 continue; 2539 if ((disk->d_flags & 2540 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2541 continue; 2542 } 2543 KASSERT((disk->d_flags & 2544 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2545 ("Disk %s isn't marked as dirty.", 2546 g_mirror_get_diskname(disk))); 2547 /* Skip the disk with the biggest priority. */ 2548 if (disk == pdisk) 2549 continue; 2550 disk->d_sync.ds_syncid = 0; 2551 } 2552 } else if (dirty < ndisks) { 2553 /* 2554 * Force synchronization for all dirty disks. 2555 * We have some non-dirty disks. 2556 */ 2557 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2558 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2559 continue; 2560 if ((disk->d_flags & 2561 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2562 continue; 2563 } 2564 if ((disk->d_flags & 2565 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2566 continue; 2567 } 2568 disk->d_sync.ds_syncid = 0; 2569 } 2570 } 2571 2572 /* Reset hint. */ 2573 sc->sc_hint = NULL; 2574 if (force) { 2575 /* Remember to bump syncid on first write. */ 2576 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2577 } 2578 state = G_MIRROR_DEVICE_STATE_RUNNING; 2579 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2580 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2581 g_mirror_device_state2str(state)); 2582 sc->sc_state = state; 2583 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2584 state = g_mirror_determine_state(disk); 2585 g_mirror_event_send(disk, state, 2586 G_MIRROR_EVENT_DONTWAIT); 2587 if (state == G_MIRROR_DISK_STATE_STALE) 2588 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2589 } 2590 break; 2591 } 2592 case G_MIRROR_DEVICE_STATE_RUNNING: 2593 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2594 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2595 /* 2596 * No usable disks, so destroy the device. 2597 */ 2598 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2599 break; 2600 } else if (g_mirror_ndisks(sc, 2601 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2602 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2603 /* 2604 * We have active disks, launch provider if it doesn't 2605 * exist. 2606 */ 2607 if (sc->sc_provider == NULL) 2608 g_mirror_launch_provider(sc); 2609 if (sc->sc_rootmount != NULL) { 2610 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2611 __LINE__, sc->sc_rootmount); 2612 root_mount_rel(sc->sc_rootmount); 2613 sc->sc_rootmount = NULL; 2614 } 2615 } 2616 /* 2617 * Genid should be bumped immediately, so do it here. 2618 */ 2619 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2620 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2621 g_mirror_bump_genid(sc); 2622 } 2623 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2624 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2625 g_mirror_bump_syncid(sc); 2626 } 2627 break; 2628 default: 2629 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2630 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2631 break; 2632 } 2633 } 2634 2635 /* 2636 * Update disk state and device state if needed. 2637 */ 2638 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2639 "Disk %s state changed from %s to %s (device %s).", \ 2640 g_mirror_get_diskname(disk), \ 2641 g_mirror_disk_state2str(disk->d_state), \ 2642 g_mirror_disk_state2str(state), sc->sc_name) 2643 static int 2644 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2645 { 2646 struct g_mirror_softc *sc; 2647 2648 sc = disk->d_softc; 2649 sx_assert(&sc->sc_lock, SX_XLOCKED); 2650 2651 again: 2652 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2653 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2654 g_mirror_disk_state2str(state)); 2655 switch (state) { 2656 case G_MIRROR_DISK_STATE_NEW: 2657 /* 2658 * Possible scenarios: 2659 * 1. New disk arrive. 2660 */ 2661 /* Previous state should be NONE. */ 2662 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2663 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2664 g_mirror_disk_state2str(disk->d_state))); 2665 DISK_STATE_CHANGED(); 2666 2667 disk->d_state = state; 2668 g_topology_lock(); 2669 if (LIST_EMPTY(&sc->sc_disks)) 2670 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2671 else { 2672 struct g_mirror_disk *dp; 2673 2674 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2675 if (disk->d_priority >= dp->d_priority) { 2676 LIST_INSERT_BEFORE(dp, disk, d_next); 2677 dp = NULL; 2678 break; 2679 } 2680 if (LIST_NEXT(dp, d_next) == NULL) 2681 break; 2682 } 2683 if (dp != NULL) 2684 LIST_INSERT_AFTER(dp, disk, d_next); 2685 } 2686 g_topology_unlock(); 2687 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2688 sc->sc_name, g_mirror_get_diskname(disk)); 2689 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2690 break; 2691 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2692 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2693 g_mirror_device_state2str(sc->sc_state), 2694 g_mirror_get_diskname(disk), 2695 g_mirror_disk_state2str(disk->d_state))); 2696 state = g_mirror_determine_state(disk); 2697 if (state != G_MIRROR_DISK_STATE_NONE) 2698 goto again; 2699 break; 2700 case G_MIRROR_DISK_STATE_ACTIVE: 2701 /* 2702 * Possible scenarios: 2703 * 1. New disk does not need synchronization. 2704 * 2. Synchronization process finished successfully. 2705 */ 2706 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2707 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2708 g_mirror_device_state2str(sc->sc_state), 2709 g_mirror_get_diskname(disk), 2710 g_mirror_disk_state2str(disk->d_state))); 2711 /* Previous state should be NEW or SYNCHRONIZING. */ 2712 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2713 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2714 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2715 g_mirror_disk_state2str(disk->d_state))); 2716 DISK_STATE_CHANGED(); 2717 2718 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2719 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2720 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2721 g_mirror_sync_stop(disk, 0); 2722 } 2723 disk->d_state = state; 2724 disk->d_sync.ds_offset = 0; 2725 disk->d_sync.ds_offset_done = 0; 2726 g_mirror_update_idle(sc, disk); 2727 g_mirror_update_metadata(disk); 2728 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2729 sc->sc_name, g_mirror_get_diskname(disk)); 2730 break; 2731 case G_MIRROR_DISK_STATE_STALE: 2732 /* 2733 * Possible scenarios: 2734 * 1. Stale disk was connected. 2735 */ 2736 /* Previous state should be NEW. */ 2737 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2738 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2739 g_mirror_disk_state2str(disk->d_state))); 2740 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2741 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2742 g_mirror_device_state2str(sc->sc_state), 2743 g_mirror_get_diskname(disk), 2744 g_mirror_disk_state2str(disk->d_state))); 2745 /* 2746 * STALE state is only possible if device is marked 2747 * NOAUTOSYNC. 2748 */ 2749 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2750 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2751 g_mirror_device_state2str(sc->sc_state), 2752 g_mirror_get_diskname(disk), 2753 g_mirror_disk_state2str(disk->d_state))); 2754 DISK_STATE_CHANGED(); 2755 2756 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2757 disk->d_state = state; 2758 g_mirror_update_metadata(disk); 2759 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2760 sc->sc_name, g_mirror_get_diskname(disk)); 2761 break; 2762 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2763 /* 2764 * Possible scenarios: 2765 * 1. Disk which needs synchronization was connected. 2766 */ 2767 /* Previous state should be NEW. */ 2768 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2769 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2770 g_mirror_disk_state2str(disk->d_state))); 2771 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2772 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2773 g_mirror_device_state2str(sc->sc_state), 2774 g_mirror_get_diskname(disk), 2775 g_mirror_disk_state2str(disk->d_state))); 2776 DISK_STATE_CHANGED(); 2777 2778 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2779 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2780 disk->d_state = state; 2781 if (sc->sc_provider != NULL) { 2782 g_mirror_sync_start(disk); 2783 g_mirror_update_metadata(disk); 2784 } 2785 break; 2786 case G_MIRROR_DISK_STATE_DISCONNECTED: 2787 /* 2788 * Possible scenarios: 2789 * 1. Device wasn't running yet, but disk disappear. 2790 * 2. Disk was active and disapppear. 2791 * 3. Disk disappear during synchronization process. 2792 */ 2793 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2794 /* 2795 * Previous state should be ACTIVE, STALE or 2796 * SYNCHRONIZING. 2797 */ 2798 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2799 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2800 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2801 ("Wrong disk state (%s, %s).", 2802 g_mirror_get_diskname(disk), 2803 g_mirror_disk_state2str(disk->d_state))); 2804 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2805 /* Previous state should be NEW. */ 2806 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2807 ("Wrong disk state (%s, %s).", 2808 g_mirror_get_diskname(disk), 2809 g_mirror_disk_state2str(disk->d_state))); 2810 /* 2811 * Reset bumping syncid if disk disappeared in STARTING 2812 * state. 2813 */ 2814 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2815 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2816 #ifdef INVARIANTS 2817 } else { 2818 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2819 sc->sc_name, 2820 g_mirror_device_state2str(sc->sc_state), 2821 g_mirror_get_diskname(disk), 2822 g_mirror_disk_state2str(disk->d_state))); 2823 #endif 2824 } 2825 DISK_STATE_CHANGED(); 2826 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2827 sc->sc_name, g_mirror_get_diskname(disk)); 2828 2829 g_mirror_destroy_disk(disk); 2830 break; 2831 case G_MIRROR_DISK_STATE_DESTROY: 2832 { 2833 int error; 2834 2835 error = g_mirror_clear_metadata(disk); 2836 if (error != 0) { 2837 G_MIRROR_DEBUG(0, 2838 "Device %s: failed to clear metadata on %s: %d.", 2839 sc->sc_name, g_mirror_get_diskname(disk), error); 2840 break; 2841 } 2842 DISK_STATE_CHANGED(); 2843 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2844 sc->sc_name, g_mirror_get_diskname(disk)); 2845 2846 g_mirror_destroy_disk(disk); 2847 sc->sc_ndisks--; 2848 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2849 g_mirror_update_metadata(disk); 2850 } 2851 break; 2852 } 2853 default: 2854 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2855 break; 2856 } 2857 return (0); 2858 } 2859 #undef DISK_STATE_CHANGED 2860 2861 int 2862 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2863 { 2864 struct g_provider *pp; 2865 u_char *buf; 2866 int error; 2867 2868 g_topology_assert(); 2869 2870 error = g_access(cp, 1, 0, 0); 2871 if (error != 0) 2872 return (error); 2873 pp = cp->provider; 2874 g_topology_unlock(); 2875 /* Metadata are stored on last sector. */ 2876 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2877 &error); 2878 g_topology_lock(); 2879 g_access(cp, -1, 0, 0); 2880 if (buf == NULL) { 2881 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2882 cp->provider->name, error); 2883 return (error); 2884 } 2885 2886 /* Decode metadata. */ 2887 error = mirror_metadata_decode(buf, md); 2888 g_free(buf); 2889 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2890 return (EINVAL); 2891 if (md->md_version > G_MIRROR_VERSION) { 2892 G_MIRROR_DEBUG(0, 2893 "Kernel module is too old to handle metadata from %s.", 2894 cp->provider->name); 2895 return (EINVAL); 2896 } 2897 if (error != 0) { 2898 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2899 cp->provider->name); 2900 return (error); 2901 } 2902 2903 return (0); 2904 } 2905 2906 static int 2907 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2908 struct g_mirror_metadata *md) 2909 { 2910 2911 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " 2912 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " 2913 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " 2914 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " 2915 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " 2916 "sc_state 0x%x.", 2917 __func__, md->md_did, pp->name, sc->sc_name, md->md_all, 2918 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, 2919 sc->sc_balance, (uintmax_t)sc->sc_mediasize, 2920 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, 2921 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, 2922 md->md_genid, md->md_priority, sc->sc_state); 2923 2924 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2925 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2926 pp->name, md->md_did); 2927 return (EEXIST); 2928 } 2929 if (sc->sc_mediasize > pp->mediasize) { 2930 G_MIRROR_DEBUG(1, 2931 "Invalid size of disk %s (device %s), skipping.", pp->name, 2932 sc->sc_name); 2933 return (EINVAL); 2934 } 2935 if (md->md_sectorsize != sc->sc_sectorsize) { 2936 G_MIRROR_DEBUG(1, 2937 "Invalid '%s' field on disk %s (device %s), skipping.", 2938 "md_sectorsize", pp->name, sc->sc_name); 2939 return (EINVAL); 2940 } 2941 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2942 G_MIRROR_DEBUG(1, 2943 "Invalid sector size of disk %s (device %s), skipping.", 2944 pp->name, sc->sc_name); 2945 return (EINVAL); 2946 } 2947 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2948 G_MIRROR_DEBUG(1, 2949 "Invalid device flags on disk %s (device %s), skipping.", 2950 pp->name, sc->sc_name); 2951 return (EINVAL); 2952 } 2953 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2954 G_MIRROR_DEBUG(1, 2955 "Invalid disk flags on disk %s (device %s), skipping.", 2956 pp->name, sc->sc_name); 2957 return (EINVAL); 2958 } 2959 return (0); 2960 } 2961 2962 int 2963 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2964 struct g_mirror_metadata *md) 2965 { 2966 struct g_mirror_disk *disk; 2967 int error; 2968 2969 g_topology_assert_not(); 2970 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2971 2972 error = g_mirror_check_metadata(sc, pp, md); 2973 if (error != 0) 2974 return (error); 2975 2976 if (md->md_genid < sc->sc_genid) { 2977 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2978 pp->name, sc->sc_name); 2979 return (EINVAL); 2980 } 2981 2982 /* 2983 * If the component disk we're tasting has newer metadata than the 2984 * STARTING gmirror device, refresh the device from the component. 2985 */ 2986 error = g_mirror_refresh_device(sc, pp, md); 2987 if (error != 0) 2988 return (error); 2989 2990 disk = g_mirror_init_disk(sc, pp, md, &error); 2991 if (disk == NULL) 2992 return (error); 2993 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2994 G_MIRROR_EVENT_WAIT); 2995 if (error != 0) 2996 return (error); 2997 if (md->md_version < G_MIRROR_VERSION) { 2998 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2999 pp->name, md->md_version, G_MIRROR_VERSION); 3000 g_mirror_update_metadata(disk); 3001 } 3002 return (0); 3003 } 3004 3005 static void 3006 g_mirror_destroy_delayed(void *arg, int flag) 3007 { 3008 struct g_mirror_softc *sc; 3009 int error; 3010 3011 if (flag == EV_CANCEL) { 3012 G_MIRROR_DEBUG(1, "Destroying canceled."); 3013 return; 3014 } 3015 sc = arg; 3016 g_topology_unlock(); 3017 sx_xlock(&sc->sc_lock); 3018 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 3019 ("DESTROY flag set on %s.", sc->sc_name)); 3020 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, 3021 ("CLOSEWAIT flag not set on %s.", sc->sc_name)); 3022 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 3023 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 3024 if (error != 0) { 3025 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 3026 sc->sc_name, error); 3027 sx_xunlock(&sc->sc_lock); 3028 } 3029 g_topology_lock(); 3030 } 3031 3032 static int 3033 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 3034 { 3035 struct g_mirror_softc *sc; 3036 int error = 0; 3037 3038 g_topology_assert(); 3039 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 3040 acw, ace); 3041 3042 sc = pp->private; 3043 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 3044 3045 g_topology_unlock(); 3046 sx_xlock(&sc->sc_lock); 3047 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 3048 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || 3049 LIST_EMPTY(&sc->sc_disks)) { 3050 if (acr > 0 || acw > 0 || ace > 0) 3051 error = ENXIO; 3052 goto end; 3053 } 3054 sc->sc_provider_open += acr + acw + ace; 3055 if (pp->acw + acw == 0) 3056 g_mirror_idle(sc, 0); 3057 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && 3058 sc->sc_provider_open == 0) 3059 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 3060 end: 3061 sx_xunlock(&sc->sc_lock); 3062 g_topology_lock(); 3063 return (error); 3064 } 3065 3066 static void 3067 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, 3068 const struct g_mirror_metadata *md) 3069 { 3070 3071 sc->sc_genid = md->md_genid; 3072 sc->sc_syncid = md->md_syncid; 3073 3074 sc->sc_slice = md->md_slice; 3075 sc->sc_balance = md->md_balance; 3076 sc->sc_mediasize = md->md_mediasize; 3077 sc->sc_ndisks = md->md_all; 3078 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; 3079 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); 3080 } 3081 3082 struct g_geom * 3083 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 3084 u_int type) 3085 { 3086 struct g_mirror_softc *sc; 3087 struct g_geom *gp; 3088 int error, timeout; 3089 3090 g_topology_assert(); 3091 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 3092 md->md_mid); 3093 3094 /* One disk is minimum. */ 3095 if (md->md_all < 1) 3096 return (NULL); 3097 /* 3098 * Action geom. 3099 */ 3100 gp = g_new_geomf(mp, "%s", md->md_name); 3101 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 3102 gp->start = g_mirror_start; 3103 gp->orphan = g_mirror_orphan; 3104 gp->access = g_mirror_access; 3105 gp->dumpconf = g_mirror_dumpconf; 3106 3107 sc->sc_type = type; 3108 sc->sc_id = md->md_mid; 3109 g_mirror_reinit_from_metadata(sc, md); 3110 sc->sc_sectorsize = md->md_sectorsize; 3111 sc->sc_bump_id = 0; 3112 sc->sc_idle = 1; 3113 sc->sc_last_write = time_uptime; 3114 sc->sc_writes = 0; 3115 sc->sc_refcnt = 1; 3116 sx_init(&sc->sc_lock, "gmirror:lock"); 3117 TAILQ_INIT(&sc->sc_queue); 3118 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 3119 TAILQ_INIT(&sc->sc_regular_delayed); 3120 TAILQ_INIT(&sc->sc_inflight); 3121 TAILQ_INIT(&sc->sc_sync_delayed); 3122 LIST_INIT(&sc->sc_disks); 3123 TAILQ_INIT(&sc->sc_events); 3124 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 3125 callout_init(&sc->sc_callout, 1); 3126 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 3127 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3128 gp->softc = sc; 3129 sc->sc_geom = gp; 3130 sc->sc_provider = NULL; 3131 sc->sc_provider_open = 0; 3132 /* 3133 * Synchronization geom. 3134 */ 3135 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3136 gp->softc = sc; 3137 gp->orphan = g_mirror_orphan; 3138 sc->sc_sync.ds_geom = gp; 3139 sc->sc_sync.ds_ndisks = 0; 3140 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3141 "g_mirror %s", md->md_name); 3142 if (error != 0) { 3143 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3144 sc->sc_name); 3145 g_destroy_geom(sc->sc_sync.ds_geom); 3146 g_destroy_geom(sc->sc_geom); 3147 g_mirror_free_device(sc); 3148 return (NULL); 3149 } 3150 3151 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3152 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3153 3154 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3155 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3156 /* 3157 * Run timeout. 3158 */ 3159 timeout = g_mirror_timeout * hz; 3160 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3161 return (sc->sc_geom); 3162 } 3163 3164 int 3165 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3166 { 3167 struct g_mirror_disk *disk; 3168 3169 g_topology_assert_not(); 3170 sx_assert(&sc->sc_lock, SX_XLOCKED); 3171 3172 if (sc->sc_provider_open != 0) { 3173 switch (how) { 3174 case G_MIRROR_DESTROY_SOFT: 3175 G_MIRROR_DEBUG(1, 3176 "Device %s is still open (%d).", sc->sc_name, 3177 sc->sc_provider_open); 3178 return (EBUSY); 3179 case G_MIRROR_DESTROY_DELAYED: 3180 G_MIRROR_DEBUG(1, 3181 "Device %s will be destroyed on last close.", 3182 sc->sc_name); 3183 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3184 if (disk->d_state == 3185 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3186 g_mirror_sync_stop(disk, 1); 3187 } 3188 } 3189 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; 3190 return (EBUSY); 3191 case G_MIRROR_DESTROY_HARD: 3192 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3193 "can't be definitely removed.", sc->sc_name); 3194 } 3195 } 3196 3197 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3198 sx_xunlock(&sc->sc_lock); 3199 return (0); 3200 } 3201 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3202 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; 3203 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3204 sx_xunlock(&sc->sc_lock); 3205 mtx_lock(&sc->sc_queue_mtx); 3206 wakeup(sc); 3207 mtx_unlock(&sc->sc_queue_mtx); 3208 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3209 while (sc->sc_worker != NULL) 3210 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3211 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3212 sx_xlock(&sc->sc_lock); 3213 g_mirror_destroy_device(sc); 3214 return (0); 3215 } 3216 3217 static void 3218 g_mirror_taste_orphan(struct g_consumer *cp) 3219 { 3220 3221 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3222 cp->provider->name)); 3223 } 3224 3225 static struct g_geom * 3226 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3227 { 3228 struct g_mirror_metadata md; 3229 struct g_mirror_softc *sc; 3230 struct g_consumer *cp; 3231 struct g_geom *gp; 3232 int error; 3233 3234 g_topology_assert(); 3235 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3236 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3237 3238 gp = g_new_geomf(mp, "mirror:taste"); 3239 /* 3240 * This orphan function should be never called. 3241 */ 3242 gp->orphan = g_mirror_taste_orphan; 3243 cp = g_new_consumer(gp); 3244 error = g_attach(cp, pp); 3245 if (error == 0) { 3246 error = g_mirror_read_metadata(cp, &md); 3247 g_detach(cp); 3248 } 3249 g_destroy_consumer(cp); 3250 g_destroy_geom(gp); 3251 if (error != 0) 3252 return (NULL); 3253 gp = NULL; 3254 3255 if (md.md_provider[0] != '\0' && 3256 !g_compare_names(md.md_provider, pp->name)) 3257 return (NULL); 3258 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3259 return (NULL); 3260 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3261 G_MIRROR_DEBUG(0, 3262 "Device %s: provider %s marked as inactive, skipping.", 3263 md.md_name, pp->name); 3264 return (NULL); 3265 } 3266 if (g_mirror_debug >= 2) 3267 mirror_metadata_dump(&md); 3268 3269 /* 3270 * Let's check if device already exists. 3271 */ 3272 sc = NULL; 3273 LIST_FOREACH(gp, &mp->geom, geom) { 3274 sc = gp->softc; 3275 if (sc == NULL) 3276 continue; 3277 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3278 continue; 3279 if (sc->sc_sync.ds_geom == gp) 3280 continue; 3281 if (strcmp(md.md_name, sc->sc_name) != 0) 3282 continue; 3283 if (md.md_mid != sc->sc_id) { 3284 G_MIRROR_DEBUG(0, "Device %s already configured.", 3285 sc->sc_name); 3286 return (NULL); 3287 } 3288 break; 3289 } 3290 if (gp == NULL) { 3291 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3292 if (gp == NULL) { 3293 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3294 md.md_name); 3295 return (NULL); 3296 } 3297 sc = gp->softc; 3298 } 3299 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3300 g_topology_unlock(); 3301 sx_xlock(&sc->sc_lock); 3302 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3303 error = g_mirror_add_disk(sc, pp, &md); 3304 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3305 if (error != 0) { 3306 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3307 pp->name, gp->name, error); 3308 if (LIST_EMPTY(&sc->sc_disks)) { 3309 g_cancel_event(sc); 3310 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3311 g_topology_lock(); 3312 return (NULL); 3313 } 3314 gp = NULL; 3315 } 3316 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3317 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3318 g_topology_lock(); 3319 return (NULL); 3320 } 3321 sx_xunlock(&sc->sc_lock); 3322 g_topology_lock(); 3323 return (gp); 3324 } 3325 3326 static void 3327 g_mirror_resize(struct g_consumer *cp) 3328 { 3329 struct g_mirror_disk *disk; 3330 3331 g_topology_assert(); 3332 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3333 3334 disk = cp->private; 3335 if (disk == NULL) 3336 return; 3337 g_topology_unlock(); 3338 g_mirror_update_metadata(disk); 3339 g_topology_lock(); 3340 } 3341 3342 static int 3343 g_mirror_destroy_geom(struct gctl_req *req __unused, 3344 struct g_class *mp __unused, struct g_geom *gp) 3345 { 3346 struct g_mirror_softc *sc; 3347 int error; 3348 3349 g_topology_unlock(); 3350 sc = gp->softc; 3351 sx_xlock(&sc->sc_lock); 3352 g_cancel_event(sc); 3353 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3354 if (error != 0) 3355 sx_xunlock(&sc->sc_lock); 3356 g_topology_lock(); 3357 return (error); 3358 } 3359 3360 static void 3361 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3362 struct g_consumer *cp, struct g_provider *pp) 3363 { 3364 struct g_mirror_softc *sc; 3365 3366 g_topology_assert(); 3367 3368 sc = gp->softc; 3369 if (sc == NULL) 3370 return; 3371 /* Skip synchronization geom. */ 3372 if (gp == sc->sc_sync.ds_geom) 3373 return; 3374 if (pp != NULL) { 3375 /* Nothing here. */ 3376 } else if (cp != NULL) { 3377 struct g_mirror_disk *disk; 3378 3379 disk = cp->private; 3380 if (disk == NULL) 3381 return; 3382 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3383 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3384 sbuf_printf(sb, "%s<Synchronized>", indent); 3385 if (disk->d_sync.ds_offset == 0) 3386 sbuf_cat(sb, "0%"); 3387 else 3388 sbuf_printf(sb, "%u%%", 3389 (u_int)((disk->d_sync.ds_offset * 100) / 3390 sc->sc_mediasize)); 3391 sbuf_cat(sb, "</Synchronized>\n"); 3392 if (disk->d_sync.ds_offset > 0) 3393 sbuf_printf(sb, "%s<BytesSynced>%jd" 3394 "</BytesSynced>\n", indent, 3395 (intmax_t)disk->d_sync.ds_offset); 3396 } 3397 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3398 disk->d_sync.ds_syncid); 3399 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3400 disk->d_genid); 3401 sbuf_printf(sb, "%s<Flags>", indent); 3402 if (disk->d_flags == 0) 3403 sbuf_cat(sb, "NONE"); 3404 else { 3405 int first = 1; 3406 3407 #define ADD_FLAG(flag, name) do { \ 3408 if ((disk->d_flags & (flag)) != 0) { \ 3409 if (!first) \ 3410 sbuf_cat(sb, ", "); \ 3411 else \ 3412 first = 0; \ 3413 sbuf_cat(sb, name); \ 3414 } \ 3415 } while (0) 3416 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3417 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3418 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3419 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3420 "SYNCHRONIZING"); 3421 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3422 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3423 #undef ADD_FLAG 3424 } 3425 sbuf_cat(sb, "</Flags>\n"); 3426 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3427 disk->d_priority); 3428 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3429 g_mirror_disk_state2str(disk->d_state)); 3430 } else { 3431 sbuf_printf(sb, "%s<Type>", indent); 3432 switch (sc->sc_type) { 3433 case G_MIRROR_TYPE_AUTOMATIC: 3434 sbuf_cat(sb, "AUTOMATIC"); 3435 break; 3436 case G_MIRROR_TYPE_MANUAL: 3437 sbuf_cat(sb, "MANUAL"); 3438 break; 3439 default: 3440 sbuf_cat(sb, "UNKNOWN"); 3441 break; 3442 } 3443 sbuf_cat(sb, "</Type>\n"); 3444 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3445 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3446 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3447 sbuf_printf(sb, "%s<Flags>", indent); 3448 if (sc->sc_flags == 0) 3449 sbuf_cat(sb, "NONE"); 3450 else { 3451 int first = 1; 3452 3453 #define ADD_FLAG(flag, name) do { \ 3454 if ((sc->sc_flags & (flag)) != 0) { \ 3455 if (!first) \ 3456 sbuf_cat(sb, ", "); \ 3457 else \ 3458 first = 0; \ 3459 sbuf_cat(sb, name); \ 3460 } \ 3461 } while (0) 3462 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3463 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3464 #undef ADD_FLAG 3465 } 3466 sbuf_cat(sb, "</Flags>\n"); 3467 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3468 (u_int)sc->sc_slice); 3469 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3470 balance_name(sc->sc_balance)); 3471 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3472 sc->sc_ndisks); 3473 sbuf_printf(sb, "%s<State>", indent); 3474 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3475 sbuf_printf(sb, "%s", "STARTING"); 3476 else if (sc->sc_ndisks == 3477 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3478 sbuf_printf(sb, "%s", "COMPLETE"); 3479 else 3480 sbuf_printf(sb, "%s", "DEGRADED"); 3481 sbuf_cat(sb, "</State>\n"); 3482 } 3483 } 3484 3485 static void 3486 g_mirror_shutdown_post_sync(void *arg, int howto) 3487 { 3488 struct g_class *mp; 3489 struct g_geom *gp, *gp2; 3490 struct g_mirror_softc *sc; 3491 int error; 3492 3493 if (KERNEL_PANICKED()) 3494 return; 3495 3496 mp = arg; 3497 g_topology_lock(); 3498 g_mirror_shutdown = 1; 3499 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3500 if ((sc = gp->softc) == NULL) 3501 continue; 3502 /* Skip synchronization geom. */ 3503 if (gp == sc->sc_sync.ds_geom) 3504 continue; 3505 g_topology_unlock(); 3506 sx_xlock(&sc->sc_lock); 3507 g_mirror_idle(sc, -1); 3508 g_cancel_event(sc); 3509 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3510 if (error != 0) 3511 sx_xunlock(&sc->sc_lock); 3512 g_topology_lock(); 3513 } 3514 g_topology_unlock(); 3515 } 3516 3517 static void 3518 g_mirror_init(struct g_class *mp) 3519 { 3520 3521 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3522 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3523 if (g_mirror_post_sync == NULL) 3524 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3525 } 3526 3527 static void 3528 g_mirror_fini(struct g_class *mp) 3529 { 3530 3531 if (g_mirror_post_sync != NULL) 3532 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3533 } 3534 3535 /* 3536 * Refresh the mirror device's metadata when gmirror encounters a newer 3537 * generation as the individual components are being added to the mirror set. 3538 */ 3539 static int 3540 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, 3541 const struct g_mirror_metadata *md) 3542 { 3543 3544 g_topology_assert_not(); 3545 sx_assert(&sc->sc_lock, SX_XLOCKED); 3546 3547 KASSERT(sc->sc_genid <= md->md_genid, 3548 ("%s: attempted to refresh from stale component %s (device %s) " 3549 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, 3550 sc->sc_genid)); 3551 3552 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && 3553 sc->sc_syncid >= md->md_syncid)) 3554 return (0); 3555 3556 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " 3557 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " 3558 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, 3559 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); 3560 3561 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { 3562 /* Probable data corruption detected */ 3563 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " 3564 "(device=%s genid=%u). A stale mirror device was launched.", 3565 g_mirror_device_state2str(sc->sc_state), sc->sc_name, 3566 sc->sc_genid); 3567 return (EINVAL); 3568 } 3569 3570 /* Update softc */ 3571 g_mirror_reinit_from_metadata(sc, md); 3572 3573 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " 3574 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, 3575 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, 3576 md->md_syncid, (unsigned)md->md_all); 3577 3578 return (0); 3579 } 3580 3581 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3582 MODULE_VERSION(geom_mirror, 0); 3583