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