1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bio.h> 35 #include <sys/eventhandler.h> 36 #include <sys/fail.h> 37 #include <sys/kernel.h> 38 #include <sys/kthread.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/proc.h> 44 #include <sys/sbuf.h> 45 #include <sys/sched.h> 46 #include <sys/sx.h> 47 #include <sys/sysctl.h> 48 49 #include <geom/geom.h> 50 #include <geom/geom_dbg.h> 51 #include <geom/mirror/g_mirror.h> 52 53 FEATURE(geom_mirror, "GEOM mirroring support"); 54 55 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 56 57 SYSCTL_DECL(_kern_geom); 58 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 59 "GEOM_MIRROR stuff"); 60 int g_mirror_debug = 0; 61 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 62 "Debug level"); 63 bool g_launch_mirror_before_timeout = true; 64 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, 65 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, 66 "If false, force gmirror to wait out the full kern.geom.mirror.timeout " 67 "before launching mirrors"); 68 static u_int g_mirror_timeout = 4; 69 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 70 0, "Time to wait on all mirror components"); 71 static u_int g_mirror_idletime = 5; 72 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 73 &g_mirror_idletime, 0, "Mark components as clean when idling"); 74 static u_int g_mirror_disconnect_on_failure = 1; 75 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 76 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 77 static u_int g_mirror_syncreqs = 2; 78 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 79 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 80 static u_int g_mirror_sync_period = 5; 81 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, 82 &g_mirror_sync_period, 0, 83 "Metadata update period during synchronization, in seconds"); 84 85 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 86 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 87 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 88 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 89 } while (0) 90 91 static eventhandler_tag g_mirror_post_sync = NULL; 92 static int g_mirror_shutdown = 0; 93 94 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 95 static g_taste_t g_mirror_taste; 96 static g_init_t g_mirror_init; 97 static g_fini_t g_mirror_fini; 98 static g_provgone_t g_mirror_providergone; 99 static g_resize_t g_mirror_resize; 100 101 struct g_class g_mirror_class = { 102 .name = G_MIRROR_CLASS_NAME, 103 .version = G_VERSION, 104 .ctlreq = g_mirror_config, 105 .taste = g_mirror_taste, 106 .destroy_geom = g_mirror_destroy_geom, 107 .init = g_mirror_init, 108 .fini = g_mirror_fini, 109 .providergone = g_mirror_providergone, 110 .resize = g_mirror_resize 111 }; 112 113 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 114 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 115 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force); 116 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 117 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 118 static void g_mirror_timeout_drain(struct g_mirror_softc *sc); 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 static const char * 129 g_mirror_disk_state2str(int state) 130 { 131 132 switch (state) { 133 case G_MIRROR_DISK_STATE_NONE: 134 return ("NONE"); 135 case G_MIRROR_DISK_STATE_NEW: 136 return ("NEW"); 137 case G_MIRROR_DISK_STATE_ACTIVE: 138 return ("ACTIVE"); 139 case G_MIRROR_DISK_STATE_STALE: 140 return ("STALE"); 141 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 142 return ("SYNCHRONIZING"); 143 case G_MIRROR_DISK_STATE_DISCONNECTED: 144 return ("DISCONNECTED"); 145 case G_MIRROR_DISK_STATE_DESTROY: 146 return ("DESTROY"); 147 default: 148 return ("INVALID"); 149 } 150 } 151 152 static const char * 153 g_mirror_device_state2str(int state) 154 { 155 156 switch (state) { 157 case G_MIRROR_DEVICE_STATE_STARTING: 158 return ("STARTING"); 159 case G_MIRROR_DEVICE_STATE_RUNNING: 160 return ("RUNNING"); 161 default: 162 return ("INVALID"); 163 } 164 } 165 166 static const char * 167 g_mirror_get_diskname(struct g_mirror_disk *disk) 168 { 169 170 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 171 return ("[unknown]"); 172 return (disk->d_name); 173 } 174 175 /* 176 * --- Events handling functions --- 177 * Events in geom_mirror are used to maintain disks and device status 178 * from one thread to simplify locking. 179 */ 180 static void 181 g_mirror_event_free(struct g_mirror_event *ep) 182 { 183 184 free(ep, M_MIRROR); 185 } 186 187 static int 188 g_mirror_event_dispatch(struct g_mirror_event *ep, void *arg, int state, 189 int flags) 190 { 191 struct g_mirror_softc *sc; 192 struct g_mirror_disk *disk; 193 int error; 194 195 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 196 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 197 disk = NULL; 198 sc = arg; 199 } else { 200 disk = arg; 201 sc = disk->d_softc; 202 } 203 ep->e_disk = disk; 204 ep->e_state = state; 205 ep->e_flags = flags; 206 ep->e_error = 0; 207 mtx_lock(&sc->sc_events_mtx); 208 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 209 mtx_unlock(&sc->sc_events_mtx); 210 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 211 mtx_lock(&sc->sc_queue_mtx); 212 wakeup(sc); 213 mtx_unlock(&sc->sc_queue_mtx); 214 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 215 return (0); 216 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 217 sx_xunlock(&sc->sc_lock); 218 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 219 mtx_lock(&sc->sc_events_mtx); 220 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 221 hz * 5); 222 } 223 error = ep->e_error; 224 g_mirror_event_free(ep); 225 sx_xlock(&sc->sc_lock); 226 return (error); 227 } 228 229 int 230 g_mirror_event_send(void *arg, int state, int flags) 231 { 232 struct g_mirror_event *ep; 233 234 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 235 return (g_mirror_event_dispatch(ep, arg, state, flags)); 236 } 237 238 static struct g_mirror_event * 239 g_mirror_event_first(struct g_mirror_softc *sc) 240 { 241 struct g_mirror_event *ep; 242 243 mtx_lock(&sc->sc_events_mtx); 244 ep = TAILQ_FIRST(&sc->sc_events); 245 mtx_unlock(&sc->sc_events_mtx); 246 return (ep); 247 } 248 249 static void 250 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 251 { 252 253 mtx_lock(&sc->sc_events_mtx); 254 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 255 mtx_unlock(&sc->sc_events_mtx); 256 } 257 258 static void 259 g_mirror_event_cancel(struct g_mirror_disk *disk) 260 { 261 struct g_mirror_softc *sc; 262 struct g_mirror_event *ep, *tmpep; 263 264 sc = disk->d_softc; 265 sx_assert(&sc->sc_lock, SX_XLOCKED); 266 267 mtx_lock(&sc->sc_events_mtx); 268 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 269 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 270 continue; 271 if (ep->e_disk != disk) 272 continue; 273 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 274 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 275 g_mirror_event_free(ep); 276 else { 277 ep->e_error = ECANCELED; 278 wakeup(ep); 279 } 280 } 281 mtx_unlock(&sc->sc_events_mtx); 282 } 283 284 /* 285 * Return the number of disks in given state. 286 * If state is equal to -1, count all connected disks. 287 */ 288 u_int 289 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 290 { 291 struct g_mirror_disk *disk; 292 u_int n = 0; 293 294 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 295 if (state == -1 || disk->d_state == state) 296 n++; 297 } 298 return (n); 299 } 300 301 /* 302 * Find a disk in mirror by its disk ID. 303 */ 304 static struct g_mirror_disk * 305 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 306 { 307 struct g_mirror_disk *disk; 308 309 sx_assert(&sc->sc_lock, SX_XLOCKED); 310 311 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 312 if (disk->d_id == id) 313 return (disk); 314 } 315 return (NULL); 316 } 317 318 static u_int 319 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 320 { 321 struct bio *bp; 322 u_int nreqs = 0; 323 324 mtx_lock(&sc->sc_queue_mtx); 325 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) { 326 if (bp->bio_from == cp) 327 nreqs++; 328 } 329 mtx_unlock(&sc->sc_queue_mtx); 330 return (nreqs); 331 } 332 333 static int 334 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 335 { 336 337 if (cp->index > 0) { 338 G_MIRROR_DEBUG(2, 339 "I/O requests for %s exist, can't destroy it now.", 340 cp->provider->name); 341 return (1); 342 } 343 if (g_mirror_nrequests(sc, cp) > 0) { 344 G_MIRROR_DEBUG(2, 345 "I/O requests for %s in queue, can't destroy it now.", 346 cp->provider->name); 347 return (1); 348 } 349 return (0); 350 } 351 352 static void 353 g_mirror_destroy_consumer(void *arg, int flags __unused) 354 { 355 struct g_consumer *cp; 356 357 g_topology_assert(); 358 359 cp = arg; 360 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 361 g_detach(cp); 362 g_destroy_consumer(cp); 363 } 364 365 static void 366 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 367 { 368 struct g_provider *pp; 369 int retaste_wait; 370 371 g_topology_assert(); 372 373 cp->private = NULL; 374 if (g_mirror_is_busy(sc, cp)) 375 return; 376 pp = cp->provider; 377 retaste_wait = 0; 378 if (cp->acw == 1) { 379 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 380 retaste_wait = 1; 381 } 382 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 383 -cp->acw, -cp->ace, 0); 384 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 385 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 386 if (retaste_wait) { 387 /* 388 * After retaste event was send (inside g_access()), we can send 389 * event to detach and destroy consumer. 390 * A class, which has consumer to the given provider connected 391 * will not receive retaste event for the provider. 392 * This is the way how I ignore retaste events when I close 393 * consumers opened for write: I detach and destroy consumer 394 * after retaste event is sent. 395 */ 396 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 397 return; 398 } 399 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 400 g_detach(cp); 401 g_destroy_consumer(cp); 402 } 403 404 static int 405 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 406 { 407 struct g_consumer *cp; 408 int error; 409 410 g_topology_assert_not(); 411 KASSERT(disk->d_consumer == NULL, 412 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 413 414 g_topology_lock(); 415 cp = g_new_consumer(disk->d_softc->sc_geom); 416 cp->flags |= G_CF_DIRECT_RECEIVE; 417 error = g_attach(cp, pp); 418 if (error != 0) { 419 g_destroy_consumer(cp); 420 g_topology_unlock(); 421 return (error); 422 } 423 error = g_access(cp, 1, 1, 1); 424 if (error != 0) { 425 g_detach(cp); 426 g_destroy_consumer(cp); 427 g_topology_unlock(); 428 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 429 pp->name, error); 430 return (error); 431 } 432 g_topology_unlock(); 433 disk->d_consumer = cp; 434 disk->d_consumer->private = disk; 435 disk->d_consumer->index = 0; 436 437 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 438 return (0); 439 } 440 441 static void 442 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 443 { 444 445 g_topology_assert(); 446 447 if (cp == NULL) 448 return; 449 if (cp->provider != NULL) 450 g_mirror_kill_consumer(sc, cp); 451 else 452 g_destroy_consumer(cp); 453 } 454 455 /* 456 * Initialize disk. This means allocate memory, create consumer, attach it 457 * to the provider and open access (r1w1e1) to it. 458 */ 459 static struct g_mirror_disk * 460 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 461 struct g_mirror_metadata *md, int *errorp) 462 { 463 struct g_mirror_disk *disk; 464 int i, error; 465 466 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 467 if (disk == NULL) { 468 error = ENOMEM; 469 goto fail; 470 } 471 disk->d_softc = sc; 472 error = g_mirror_connect_disk(disk, pp); 473 if (error != 0) 474 goto fail; 475 disk->d_id = md->md_did; 476 disk->d_state = G_MIRROR_DISK_STATE_NONE; 477 disk->d_priority = md->md_priority; 478 disk->d_flags = md->md_dflags; 479 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 480 if (error == 0 && i != 0) 481 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 482 if (md->md_provider[0] != '\0') 483 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 484 disk->d_sync.ds_consumer = NULL; 485 disk->d_sync.ds_offset = md->md_sync_offset; 486 disk->d_sync.ds_offset_done = md->md_sync_offset; 487 disk->d_sync.ds_update_ts = time_uptime; 488 disk->d_genid = md->md_genid; 489 disk->d_sync.ds_syncid = md->md_syncid; 490 disk->d_init_ndisks = md->md_all; 491 disk->d_init_slice = md->md_slice; 492 disk->d_init_balance = md->md_balance; 493 disk->d_init_mediasize = md->md_mediasize; 494 if (errorp != NULL) 495 *errorp = 0; 496 return (disk); 497 fail: 498 if (errorp != NULL) 499 *errorp = error; 500 if (disk != NULL) 501 free(disk, M_MIRROR); 502 return (NULL); 503 } 504 505 static void 506 g_mirror_destroy_disk(struct g_mirror_disk *disk) 507 { 508 struct g_mirror_softc *sc; 509 510 g_topology_assert_not(); 511 sc = disk->d_softc; 512 sx_assert(&sc->sc_lock, SX_XLOCKED); 513 514 g_topology_lock(); 515 LIST_REMOVE(disk, d_next); 516 g_topology_unlock(); 517 g_mirror_event_cancel(disk); 518 if (sc->sc_hint == disk) 519 sc->sc_hint = NULL; 520 switch (disk->d_state) { 521 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 522 g_mirror_sync_stop(disk, 1); 523 /* FALLTHROUGH */ 524 case G_MIRROR_DISK_STATE_NEW: 525 case G_MIRROR_DISK_STATE_STALE: 526 case G_MIRROR_DISK_STATE_ACTIVE: 527 g_topology_lock(); 528 g_mirror_disconnect_consumer(sc, disk->d_consumer); 529 g_topology_unlock(); 530 free(disk, M_MIRROR); 531 break; 532 default: 533 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 534 g_mirror_get_diskname(disk), 535 g_mirror_disk_state2str(disk->d_state))); 536 } 537 } 538 539 static void 540 g_mirror_free_device(struct g_mirror_softc *sc) 541 { 542 543 g_topology_assert(); 544 545 mtx_destroy(&sc->sc_queue_mtx); 546 mtx_destroy(&sc->sc_events_mtx); 547 mtx_destroy(&sc->sc_done_mtx); 548 sx_destroy(&sc->sc_lock); 549 free(sc, M_MIRROR); 550 } 551 552 static void 553 g_mirror_providergone(struct g_provider *pp) 554 { 555 struct g_mirror_softc *sc = pp->private; 556 557 if ((--sc->sc_refcnt) == 0) 558 g_mirror_free_device(sc); 559 } 560 561 static void 562 g_mirror_destroy_device(struct g_mirror_softc *sc) 563 { 564 struct g_mirror_disk *disk; 565 struct g_mirror_event *ep; 566 struct g_geom *gp; 567 struct g_consumer *cp, *tmpcp; 568 569 g_topology_assert_not(); 570 sx_assert(&sc->sc_lock, SX_XLOCKED); 571 572 gp = sc->sc_geom; 573 if (sc->sc_provider != NULL) 574 g_mirror_destroy_provider(sc); 575 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 576 disk = LIST_FIRST(&sc->sc_disks)) { 577 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 578 g_mirror_update_metadata(disk); 579 g_mirror_destroy_disk(disk); 580 } 581 while ((ep = g_mirror_event_first(sc)) != NULL) { 582 g_mirror_event_remove(sc, ep); 583 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 584 g_mirror_event_free(ep); 585 else { 586 ep->e_error = ECANCELED; 587 ep->e_flags |= G_MIRROR_EVENT_DONE; 588 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 589 mtx_lock(&sc->sc_events_mtx); 590 wakeup(ep); 591 mtx_unlock(&sc->sc_events_mtx); 592 } 593 } 594 g_mirror_timeout_drain(sc); 595 596 g_topology_lock(); 597 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 598 g_mirror_disconnect_consumer(sc, cp); 599 } 600 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 601 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 602 g_wither_geom(gp, ENXIO); 603 sx_xunlock(&sc->sc_lock); 604 if ((--sc->sc_refcnt) == 0) 605 g_mirror_free_device(sc); 606 g_topology_unlock(); 607 } 608 609 static void 610 g_mirror_orphan(struct g_consumer *cp) 611 { 612 struct g_mirror_disk *disk; 613 614 g_topology_assert(); 615 616 disk = cp->private; 617 if (disk == NULL) 618 return; 619 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 620 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 621 G_MIRROR_EVENT_DONTWAIT); 622 } 623 624 /* 625 * Function should return the next active disk on the list. 626 * It is possible that it will be the same disk as given. 627 * If there are no active disks on list, NULL is returned. 628 */ 629 static __inline struct g_mirror_disk * 630 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 631 { 632 struct g_mirror_disk *dp; 633 634 for (dp = LIST_NEXT(disk, d_next); dp != disk; 635 dp = LIST_NEXT(dp, d_next)) { 636 if (dp == NULL) 637 dp = LIST_FIRST(&sc->sc_disks); 638 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 639 break; 640 } 641 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 642 return (NULL); 643 return (dp); 644 } 645 646 static struct g_mirror_disk * 647 g_mirror_get_disk(struct g_mirror_softc *sc) 648 { 649 struct g_mirror_disk *disk; 650 651 if (sc->sc_hint == NULL) { 652 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 653 if (sc->sc_hint == NULL) 654 return (NULL); 655 } 656 disk = sc->sc_hint; 657 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 658 disk = g_mirror_find_next(sc, disk); 659 if (disk == NULL) 660 return (NULL); 661 } 662 sc->sc_hint = g_mirror_find_next(sc, disk); 663 return (disk); 664 } 665 666 static int 667 g_mirror_write_metadata(struct g_mirror_disk *disk, 668 struct g_mirror_metadata *md) 669 { 670 struct g_mirror_softc *sc; 671 struct g_consumer *cp; 672 off_t offset, length; 673 u_char *sector; 674 int error = 0; 675 676 g_topology_assert_not(); 677 sc = disk->d_softc; 678 sx_assert(&sc->sc_lock, SX_LOCKED); 679 680 cp = disk->d_consumer; 681 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 682 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 683 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 684 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 685 cp->acw, cp->ace)); 686 length = cp->provider->sectorsize; 687 offset = cp->provider->mediasize - length; 688 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 689 if (md != NULL && 690 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 691 /* 692 * Handle the case, when the size of parent provider reduced. 693 */ 694 if (offset < md->md_mediasize) 695 error = ENOSPC; 696 else 697 mirror_metadata_encode(md, sector); 698 } 699 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 700 if (error == 0) 701 error = g_write_data(cp, offset, sector, length); 702 free(sector, M_MIRROR); 703 if (error != 0) { 704 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 705 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 706 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 707 "(device=%s, error=%d).", 708 g_mirror_get_diskname(disk), sc->sc_name, error); 709 } else { 710 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 711 "(device=%s, error=%d).", 712 g_mirror_get_diskname(disk), sc->sc_name, error); 713 } 714 if (g_mirror_disconnect_on_failure && 715 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 716 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 717 g_mirror_event_send(disk, 718 G_MIRROR_DISK_STATE_DISCONNECTED, 719 G_MIRROR_EVENT_DONTWAIT); 720 } 721 } 722 return (error); 723 } 724 725 static int 726 g_mirror_clear_metadata(struct g_mirror_disk *disk) 727 { 728 int error; 729 730 g_topology_assert_not(); 731 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 732 733 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 734 return (0); 735 error = g_mirror_write_metadata(disk, NULL); 736 if (error == 0) { 737 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 738 g_mirror_get_diskname(disk)); 739 } else { 740 G_MIRROR_DEBUG(0, 741 "Cannot clear metadata on disk %s (error=%d).", 742 g_mirror_get_diskname(disk), error); 743 } 744 return (error); 745 } 746 747 void 748 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 749 struct g_mirror_metadata *md) 750 { 751 752 bzero(md, sizeof(*md)); 753 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 754 md->md_version = G_MIRROR_VERSION; 755 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 756 md->md_mid = sc->sc_id; 757 md->md_all = sc->sc_ndisks; 758 md->md_slice = sc->sc_slice; 759 md->md_balance = sc->sc_balance; 760 md->md_genid = sc->sc_genid; 761 md->md_mediasize = sc->sc_mediasize; 762 md->md_sectorsize = sc->sc_sectorsize; 763 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 764 if (disk == NULL) { 765 md->md_did = arc4random(); 766 } else { 767 md->md_did = disk->d_id; 768 md->md_priority = disk->d_priority; 769 md->md_syncid = disk->d_sync.ds_syncid; 770 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 771 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 772 md->md_sync_offset = disk->d_sync.ds_offset_done; 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 struct g_mirror_event *ep; 2297 2298 sc = arg; 2299 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2300 ep = sc->sc_timeout_event; 2301 sc->sc_timeout_event = NULL; 2302 g_mirror_event_dispatch(ep, sc, 0, 2303 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2304 } 2305 2306 static void 2307 g_mirror_timeout_drain(struct g_mirror_softc *sc) 2308 { 2309 sx_assert(&sc->sc_lock, SX_XLOCKED); 2310 2311 callout_drain(&sc->sc_callout); 2312 g_mirror_event_free(sc->sc_timeout_event); 2313 sc->sc_timeout_event = NULL; 2314 } 2315 2316 static u_int 2317 g_mirror_determine_state(struct g_mirror_disk *disk) 2318 { 2319 struct g_mirror_softc *sc; 2320 u_int state; 2321 2322 sc = disk->d_softc; 2323 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2324 if ((disk->d_flags & 2325 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 && 2326 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || 2327 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { 2328 /* Disk does not need synchronization. */ 2329 state = G_MIRROR_DISK_STATE_ACTIVE; 2330 } else { 2331 if ((sc->sc_flags & 2332 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2333 (disk->d_flags & 2334 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2335 /* 2336 * We can start synchronization from 2337 * the stored offset. 2338 */ 2339 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2340 } else { 2341 state = G_MIRROR_DISK_STATE_STALE; 2342 } 2343 } 2344 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2345 /* 2346 * Reset all synchronization data for this disk, 2347 * because if it even was synchronized, it was 2348 * synchronized to disks with different syncid. 2349 */ 2350 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2351 disk->d_sync.ds_offset = 0; 2352 disk->d_sync.ds_offset_done = 0; 2353 disk->d_sync.ds_syncid = sc->sc_syncid; 2354 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2355 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2356 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2357 } else { 2358 state = G_MIRROR_DISK_STATE_STALE; 2359 } 2360 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2361 /* 2362 * Not good, NOT GOOD! 2363 * It means that mirror was started on stale disks 2364 * and more fresh disk just arrive. 2365 * If there were writes, mirror is broken, sorry. 2366 * I think the best choice here is don't touch 2367 * this disk and inform the user loudly. 2368 */ 2369 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2370 "disk (%s) arrives!! It will not be connected to the " 2371 "running device.", sc->sc_name, 2372 g_mirror_get_diskname(disk)); 2373 g_mirror_destroy_disk(disk); 2374 state = G_MIRROR_DISK_STATE_NONE; 2375 /* Return immediately, because disk was destroyed. */ 2376 return (state); 2377 } 2378 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2379 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2380 return (state); 2381 } 2382 2383 /* 2384 * Update device state. 2385 */ 2386 static void 2387 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2388 { 2389 struct g_mirror_disk *disk; 2390 u_int state; 2391 2392 sx_assert(&sc->sc_lock, SX_XLOCKED); 2393 2394 switch (sc->sc_state) { 2395 case G_MIRROR_DEVICE_STATE_STARTING: 2396 { 2397 struct g_mirror_disk *pdisk, *tdisk; 2398 const char *mismatch; 2399 uintmax_t found, newest; 2400 u_int dirty, ndisks; 2401 2402 /* Pre-flight checks */ 2403 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2404 /* 2405 * Confirm we already detected the newest genid. 2406 */ 2407 KASSERT(sc->sc_genid >= disk->d_genid, 2408 ("%s: found newer genid %u (sc:%p had %u).", __func__, 2409 disk->d_genid, sc, sc->sc_genid)); 2410 2411 /* Kick out any previously tasted stale components. */ 2412 if (disk->d_genid < sc->sc_genid) { 2413 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " 2414 "(device %s) (component=%u latest=%u), skipping.", 2415 g_mirror_get_diskname(disk), sc->sc_name, 2416 disk->d_genid, sc->sc_genid); 2417 g_mirror_destroy_disk(disk); 2418 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2419 continue; 2420 } 2421 2422 /* 2423 * Confirm we already detected the newest syncid. 2424 */ 2425 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, 2426 ("%s: found newer syncid %u (sc:%p had %u).", 2427 __func__, disk->d_sync.ds_syncid, sc, 2428 sc->sc_syncid)); 2429 2430 #define DETECT_MISMATCH(field, name) \ 2431 if (mismatch == NULL && \ 2432 disk->d_init_ ## field != sc->sc_ ## field) { \ 2433 mismatch = name; \ 2434 found = (intmax_t)disk->d_init_ ## field; \ 2435 newest = (intmax_t)sc->sc_ ## field; \ 2436 } 2437 mismatch = NULL; 2438 DETECT_MISMATCH(ndisks, "md_all"); 2439 DETECT_MISMATCH(balance, "md_balance"); 2440 DETECT_MISMATCH(slice, "md_slice"); 2441 DETECT_MISMATCH(mediasize, "md_mediasize"); 2442 #undef DETECT_MISMATCH 2443 if (mismatch != NULL) { 2444 G_MIRROR_DEBUG(0, "Found a mismatching '%s' " 2445 "field on %s (device %s) (found=%ju " 2446 "newest=%ju).", mismatch, 2447 g_mirror_get_diskname(disk), sc->sc_name, 2448 found, newest); 2449 g_mirror_destroy_disk(disk); 2450 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2451 continue; 2452 } 2453 } 2454 2455 KASSERT(sc->sc_provider == NULL, 2456 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2457 /* 2458 * Are we ready? If the timeout (force is true) has expired, and 2459 * any disks are present, then yes. If we're permitted to launch 2460 * before the timeout has expired and the expected number of 2461 * current-generation mirror disks have been tasted, then yes. 2462 */ 2463 ndisks = g_mirror_ndisks(sc, -1); 2464 if ((force && ndisks > 0) || 2465 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { 2466 ; 2467 } else if (ndisks == 0) { 2468 /* 2469 * Disks went down in starting phase, so destroy 2470 * device. 2471 */ 2472 g_mirror_timeout_drain(sc); 2473 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2474 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2475 sc->sc_rootmount); 2476 root_mount_rel(sc->sc_rootmount); 2477 sc->sc_rootmount = NULL; 2478 return; 2479 } else { 2480 return; 2481 } 2482 2483 /* 2484 * Activate all disks with the biggest syncid. 2485 */ 2486 if (force) { 2487 /* 2488 * If 'force' is true, we have been called due to 2489 * timeout, so don't bother canceling timeout. 2490 */ 2491 ndisks = 0; 2492 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2493 if ((disk->d_flags & 2494 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2495 ndisks++; 2496 } 2497 } 2498 if (ndisks == 0) { 2499 /* No valid disks found, destroy device. */ 2500 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2501 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2502 __LINE__, sc->sc_rootmount); 2503 root_mount_rel(sc->sc_rootmount); 2504 sc->sc_rootmount = NULL; 2505 return; 2506 } 2507 } else { 2508 /* Cancel timeout. */ 2509 g_mirror_timeout_drain(sc); 2510 } 2511 2512 /* 2513 * Here we need to look for dirty disks and if all disks 2514 * with the biggest syncid are dirty, we have to choose 2515 * one with the biggest priority and rebuild the rest. 2516 */ 2517 /* 2518 * Find the number of dirty disks with the biggest syncid. 2519 * Find the number of disks with the biggest syncid. 2520 * While here, find a disk with the biggest priority. 2521 */ 2522 dirty = ndisks = 0; 2523 pdisk = NULL; 2524 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2525 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2526 continue; 2527 if ((disk->d_flags & 2528 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2529 continue; 2530 } 2531 ndisks++; 2532 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2533 dirty++; 2534 if (pdisk == NULL || 2535 pdisk->d_priority < disk->d_priority) { 2536 pdisk = disk; 2537 } 2538 } 2539 } 2540 if (dirty == 0) { 2541 /* No dirty disks at all, great. */ 2542 } else if (dirty == ndisks) { 2543 /* 2544 * Force synchronization for all dirty disks except one 2545 * with the biggest priority. 2546 */ 2547 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2548 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2549 "master disk for synchronization.", 2550 g_mirror_get_diskname(pdisk), sc->sc_name); 2551 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2552 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2553 continue; 2554 if ((disk->d_flags & 2555 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2556 continue; 2557 } 2558 KASSERT((disk->d_flags & 2559 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2560 ("Disk %s isn't marked as dirty.", 2561 g_mirror_get_diskname(disk))); 2562 /* Skip the disk with the biggest priority. */ 2563 if (disk == pdisk) 2564 continue; 2565 disk->d_sync.ds_syncid = 0; 2566 } 2567 } else if (dirty < ndisks) { 2568 /* 2569 * Force synchronization for all dirty disks. 2570 * We have some non-dirty disks. 2571 */ 2572 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2573 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2574 continue; 2575 if ((disk->d_flags & 2576 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2577 continue; 2578 } 2579 if ((disk->d_flags & 2580 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2581 continue; 2582 } 2583 disk->d_sync.ds_syncid = 0; 2584 } 2585 } 2586 2587 /* Reset hint. */ 2588 sc->sc_hint = NULL; 2589 if (force) { 2590 /* Remember to bump syncid on first write. */ 2591 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2592 } 2593 state = G_MIRROR_DEVICE_STATE_RUNNING; 2594 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2595 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2596 g_mirror_device_state2str(state)); 2597 sc->sc_state = state; 2598 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2599 state = g_mirror_determine_state(disk); 2600 g_mirror_event_send(disk, state, 2601 G_MIRROR_EVENT_DONTWAIT); 2602 if (state == G_MIRROR_DISK_STATE_STALE) 2603 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2604 } 2605 break; 2606 } 2607 case G_MIRROR_DEVICE_STATE_RUNNING: 2608 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2609 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2610 /* 2611 * No usable disks, so destroy the device. 2612 */ 2613 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2614 break; 2615 } else if (g_mirror_ndisks(sc, 2616 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2617 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2618 /* 2619 * We have active disks, launch provider if it doesn't 2620 * exist. 2621 */ 2622 if (sc->sc_provider == NULL) 2623 g_mirror_launch_provider(sc); 2624 if (sc->sc_rootmount != NULL) { 2625 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2626 __LINE__, sc->sc_rootmount); 2627 root_mount_rel(sc->sc_rootmount); 2628 sc->sc_rootmount = NULL; 2629 } 2630 } 2631 /* 2632 * Genid should be bumped immediately, so do it here. 2633 */ 2634 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2635 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2636 g_mirror_bump_genid(sc); 2637 } 2638 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2639 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2640 g_mirror_bump_syncid(sc); 2641 } 2642 break; 2643 default: 2644 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2645 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2646 break; 2647 } 2648 } 2649 2650 /* 2651 * Update disk state and device state if needed. 2652 */ 2653 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2654 "Disk %s state changed from %s to %s (device %s).", \ 2655 g_mirror_get_diskname(disk), \ 2656 g_mirror_disk_state2str(disk->d_state), \ 2657 g_mirror_disk_state2str(state), sc->sc_name) 2658 static int 2659 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2660 { 2661 struct g_mirror_softc *sc; 2662 2663 sc = disk->d_softc; 2664 sx_assert(&sc->sc_lock, SX_XLOCKED); 2665 2666 again: 2667 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2668 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2669 g_mirror_disk_state2str(state)); 2670 switch (state) { 2671 case G_MIRROR_DISK_STATE_NEW: 2672 /* 2673 * Possible scenarios: 2674 * 1. New disk arrive. 2675 */ 2676 /* Previous state should be NONE. */ 2677 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2678 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2679 g_mirror_disk_state2str(disk->d_state))); 2680 DISK_STATE_CHANGED(); 2681 2682 disk->d_state = state; 2683 g_topology_lock(); 2684 if (LIST_EMPTY(&sc->sc_disks)) 2685 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2686 else { 2687 struct g_mirror_disk *dp; 2688 2689 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2690 if (disk->d_priority >= dp->d_priority) { 2691 LIST_INSERT_BEFORE(dp, disk, d_next); 2692 dp = NULL; 2693 break; 2694 } 2695 if (LIST_NEXT(dp, d_next) == NULL) 2696 break; 2697 } 2698 if (dp != NULL) 2699 LIST_INSERT_AFTER(dp, disk, d_next); 2700 } 2701 g_topology_unlock(); 2702 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2703 sc->sc_name, g_mirror_get_diskname(disk)); 2704 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2705 break; 2706 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2707 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2708 g_mirror_device_state2str(sc->sc_state), 2709 g_mirror_get_diskname(disk), 2710 g_mirror_disk_state2str(disk->d_state))); 2711 state = g_mirror_determine_state(disk); 2712 if (state != G_MIRROR_DISK_STATE_NONE) 2713 goto again; 2714 break; 2715 case G_MIRROR_DISK_STATE_ACTIVE: 2716 /* 2717 * Possible scenarios: 2718 * 1. New disk does not need synchronization. 2719 * 2. Synchronization process finished successfully. 2720 */ 2721 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2722 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2723 g_mirror_device_state2str(sc->sc_state), 2724 g_mirror_get_diskname(disk), 2725 g_mirror_disk_state2str(disk->d_state))); 2726 /* Previous state should be NEW or SYNCHRONIZING. */ 2727 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2728 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2729 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2730 g_mirror_disk_state2str(disk->d_state))); 2731 DISK_STATE_CHANGED(); 2732 2733 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2734 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2735 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2736 g_mirror_sync_stop(disk, 0); 2737 } 2738 disk->d_state = state; 2739 disk->d_sync.ds_offset = 0; 2740 disk->d_sync.ds_offset_done = 0; 2741 g_mirror_update_idle(sc, disk); 2742 g_mirror_update_metadata(disk); 2743 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2744 sc->sc_name, g_mirror_get_diskname(disk)); 2745 break; 2746 case G_MIRROR_DISK_STATE_STALE: 2747 /* 2748 * Possible scenarios: 2749 * 1. Stale disk was connected. 2750 */ 2751 /* Previous state should be NEW. */ 2752 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2753 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2754 g_mirror_disk_state2str(disk->d_state))); 2755 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2756 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2757 g_mirror_device_state2str(sc->sc_state), 2758 g_mirror_get_diskname(disk), 2759 g_mirror_disk_state2str(disk->d_state))); 2760 /* 2761 * STALE state is only possible if device is marked 2762 * NOAUTOSYNC. 2763 */ 2764 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2765 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2766 g_mirror_device_state2str(sc->sc_state), 2767 g_mirror_get_diskname(disk), 2768 g_mirror_disk_state2str(disk->d_state))); 2769 DISK_STATE_CHANGED(); 2770 2771 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2772 disk->d_state = state; 2773 g_mirror_update_metadata(disk); 2774 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2775 sc->sc_name, g_mirror_get_diskname(disk)); 2776 break; 2777 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2778 /* 2779 * Possible scenarios: 2780 * 1. Disk which needs synchronization was connected. 2781 */ 2782 /* Previous state should be NEW. */ 2783 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2784 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2785 g_mirror_disk_state2str(disk->d_state))); 2786 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2787 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2788 g_mirror_device_state2str(sc->sc_state), 2789 g_mirror_get_diskname(disk), 2790 g_mirror_disk_state2str(disk->d_state))); 2791 DISK_STATE_CHANGED(); 2792 2793 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2794 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2795 disk->d_state = state; 2796 if (sc->sc_provider != NULL) { 2797 g_mirror_sync_start(disk); 2798 g_mirror_update_metadata(disk); 2799 } 2800 break; 2801 case G_MIRROR_DISK_STATE_DISCONNECTED: 2802 /* 2803 * Possible scenarios: 2804 * 1. Device wasn't running yet, but disk disappear. 2805 * 2. Disk was active and disapppear. 2806 * 3. Disk disappear during synchronization process. 2807 */ 2808 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2809 /* 2810 * Previous state should be ACTIVE, STALE or 2811 * SYNCHRONIZING. 2812 */ 2813 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2814 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2815 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2816 ("Wrong disk state (%s, %s).", 2817 g_mirror_get_diskname(disk), 2818 g_mirror_disk_state2str(disk->d_state))); 2819 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2820 /* Previous state should be NEW. */ 2821 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2822 ("Wrong disk state (%s, %s).", 2823 g_mirror_get_diskname(disk), 2824 g_mirror_disk_state2str(disk->d_state))); 2825 /* 2826 * Reset bumping syncid if disk disappeared in STARTING 2827 * state. 2828 */ 2829 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2830 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2831 #ifdef INVARIANTS 2832 } else { 2833 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2834 sc->sc_name, 2835 g_mirror_device_state2str(sc->sc_state), 2836 g_mirror_get_diskname(disk), 2837 g_mirror_disk_state2str(disk->d_state))); 2838 #endif 2839 } 2840 DISK_STATE_CHANGED(); 2841 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2842 sc->sc_name, g_mirror_get_diskname(disk)); 2843 2844 g_mirror_destroy_disk(disk); 2845 break; 2846 case G_MIRROR_DISK_STATE_DESTROY: 2847 { 2848 int error; 2849 2850 error = g_mirror_clear_metadata(disk); 2851 if (error != 0) { 2852 G_MIRROR_DEBUG(0, 2853 "Device %s: failed to clear metadata on %s: %d.", 2854 sc->sc_name, g_mirror_get_diskname(disk), error); 2855 break; 2856 } 2857 DISK_STATE_CHANGED(); 2858 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2859 sc->sc_name, g_mirror_get_diskname(disk)); 2860 2861 g_mirror_destroy_disk(disk); 2862 sc->sc_ndisks--; 2863 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2864 g_mirror_update_metadata(disk); 2865 } 2866 break; 2867 } 2868 default: 2869 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2870 break; 2871 } 2872 return (0); 2873 } 2874 #undef DISK_STATE_CHANGED 2875 2876 int 2877 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2878 { 2879 struct g_provider *pp; 2880 u_char *buf; 2881 int error; 2882 2883 g_topology_assert(); 2884 2885 error = g_access(cp, 1, 0, 0); 2886 if (error != 0) 2887 return (error); 2888 pp = cp->provider; 2889 g_topology_unlock(); 2890 /* Metadata are stored on last sector. */ 2891 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2892 &error); 2893 g_topology_lock(); 2894 g_access(cp, -1, 0, 0); 2895 if (buf == NULL) { 2896 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2897 cp->provider->name, error); 2898 return (error); 2899 } 2900 2901 /* Decode metadata. */ 2902 error = mirror_metadata_decode(buf, md); 2903 g_free(buf); 2904 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2905 return (EINVAL); 2906 if (md->md_version > G_MIRROR_VERSION) { 2907 G_MIRROR_DEBUG(0, 2908 "Kernel module is too old to handle metadata from %s.", 2909 cp->provider->name); 2910 return (EINVAL); 2911 } 2912 if (error != 0) { 2913 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2914 cp->provider->name); 2915 return (error); 2916 } 2917 2918 return (0); 2919 } 2920 2921 static int 2922 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2923 struct g_mirror_metadata *md) 2924 { 2925 2926 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " 2927 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " 2928 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " 2929 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " 2930 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " 2931 "sc_state 0x%x.", 2932 __func__, md->md_did, pp->name, sc->sc_name, md->md_all, 2933 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, 2934 sc->sc_balance, (uintmax_t)sc->sc_mediasize, 2935 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, 2936 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, 2937 md->md_genid, md->md_priority, sc->sc_state); 2938 2939 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2940 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2941 pp->name, md->md_did); 2942 return (EEXIST); 2943 } 2944 if (sc->sc_mediasize > pp->mediasize) { 2945 G_MIRROR_DEBUG(1, 2946 "Invalid size of disk %s (device %s), skipping.", pp->name, 2947 sc->sc_name); 2948 return (EINVAL); 2949 } 2950 if (md->md_sectorsize != sc->sc_sectorsize) { 2951 G_MIRROR_DEBUG(1, 2952 "Invalid '%s' field on disk %s (device %s), skipping.", 2953 "md_sectorsize", pp->name, sc->sc_name); 2954 return (EINVAL); 2955 } 2956 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2957 G_MIRROR_DEBUG(1, 2958 "Invalid sector size of disk %s (device %s), skipping.", 2959 pp->name, sc->sc_name); 2960 return (EINVAL); 2961 } 2962 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2963 G_MIRROR_DEBUG(1, 2964 "Invalid device flags on disk %s (device %s), skipping.", 2965 pp->name, sc->sc_name); 2966 return (EINVAL); 2967 } 2968 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2969 G_MIRROR_DEBUG(1, 2970 "Invalid disk flags on disk %s (device %s), skipping.", 2971 pp->name, sc->sc_name); 2972 return (EINVAL); 2973 } 2974 return (0); 2975 } 2976 2977 int 2978 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2979 struct g_mirror_metadata *md) 2980 { 2981 struct g_mirror_disk *disk; 2982 int error; 2983 2984 g_topology_assert_not(); 2985 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2986 2987 error = g_mirror_check_metadata(sc, pp, md); 2988 if (error != 0) 2989 return (error); 2990 2991 if (md->md_genid < sc->sc_genid) { 2992 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2993 pp->name, sc->sc_name); 2994 return (EINVAL); 2995 } 2996 2997 /* 2998 * If the component disk we're tasting has newer metadata than the 2999 * STARTING gmirror device, refresh the device from the component. 3000 */ 3001 error = g_mirror_refresh_device(sc, pp, md); 3002 if (error != 0) 3003 return (error); 3004 3005 disk = g_mirror_init_disk(sc, pp, md, &error); 3006 if (disk == NULL) 3007 return (error); 3008 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 3009 G_MIRROR_EVENT_WAIT); 3010 if (error != 0) 3011 return (error); 3012 if (md->md_version < G_MIRROR_VERSION) { 3013 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 3014 pp->name, md->md_version, G_MIRROR_VERSION); 3015 g_mirror_update_metadata(disk); 3016 } 3017 return (0); 3018 } 3019 3020 static void 3021 g_mirror_destroy_delayed(void *arg, int flag) 3022 { 3023 struct g_mirror_softc *sc; 3024 int error; 3025 3026 if (flag == EV_CANCEL) { 3027 G_MIRROR_DEBUG(1, "Destroying canceled."); 3028 return; 3029 } 3030 sc = arg; 3031 g_topology_unlock(); 3032 sx_xlock(&sc->sc_lock); 3033 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 3034 ("DESTROY flag set on %s.", sc->sc_name)); 3035 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, 3036 ("CLOSEWAIT flag not set on %s.", sc->sc_name)); 3037 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 3038 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 3039 if (error != 0) { 3040 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 3041 sc->sc_name, error); 3042 sx_xunlock(&sc->sc_lock); 3043 } 3044 g_topology_lock(); 3045 } 3046 3047 static int 3048 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 3049 { 3050 struct g_mirror_softc *sc; 3051 int error = 0; 3052 3053 g_topology_assert(); 3054 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 3055 acw, ace); 3056 3057 sc = pp->private; 3058 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 3059 3060 g_topology_unlock(); 3061 sx_xlock(&sc->sc_lock); 3062 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 3063 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || 3064 LIST_EMPTY(&sc->sc_disks)) { 3065 if (acr > 0 || acw > 0 || ace > 0) 3066 error = ENXIO; 3067 goto end; 3068 } 3069 sc->sc_provider_open += acr + acw + ace; 3070 if (pp->acw + acw == 0) 3071 g_mirror_idle(sc, 0); 3072 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && 3073 sc->sc_provider_open == 0) 3074 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 3075 end: 3076 sx_xunlock(&sc->sc_lock); 3077 g_topology_lock(); 3078 return (error); 3079 } 3080 3081 static void 3082 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, 3083 const struct g_mirror_metadata *md) 3084 { 3085 3086 sc->sc_genid = md->md_genid; 3087 sc->sc_syncid = md->md_syncid; 3088 3089 sc->sc_slice = md->md_slice; 3090 sc->sc_balance = md->md_balance; 3091 sc->sc_mediasize = md->md_mediasize; 3092 sc->sc_ndisks = md->md_all; 3093 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; 3094 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); 3095 } 3096 3097 struct g_geom * 3098 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 3099 u_int type) 3100 { 3101 struct g_mirror_softc *sc; 3102 struct g_geom *gp; 3103 int error, timeout; 3104 3105 g_topology_assert(); 3106 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 3107 md->md_mid); 3108 3109 /* One disk is minimum. */ 3110 if (md->md_all < 1) 3111 return (NULL); 3112 /* 3113 * Action geom. 3114 */ 3115 gp = g_new_geomf(mp, "%s", md->md_name); 3116 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 3117 gp->start = g_mirror_start; 3118 gp->orphan = g_mirror_orphan; 3119 gp->access = g_mirror_access; 3120 gp->dumpconf = g_mirror_dumpconf; 3121 3122 sc->sc_type = type; 3123 sc->sc_id = md->md_mid; 3124 g_mirror_reinit_from_metadata(sc, md); 3125 sc->sc_sectorsize = md->md_sectorsize; 3126 sc->sc_bump_id = 0; 3127 sc->sc_idle = 1; 3128 sc->sc_last_write = time_uptime; 3129 sc->sc_writes = 0; 3130 sc->sc_refcnt = 1; 3131 sx_init(&sc->sc_lock, "gmirror:lock"); 3132 TAILQ_INIT(&sc->sc_queue); 3133 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 3134 TAILQ_INIT(&sc->sc_regular_delayed); 3135 TAILQ_INIT(&sc->sc_inflight); 3136 TAILQ_INIT(&sc->sc_sync_delayed); 3137 LIST_INIT(&sc->sc_disks); 3138 TAILQ_INIT(&sc->sc_events); 3139 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 3140 callout_init(&sc->sc_callout, 1); 3141 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 3142 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3143 gp->softc = sc; 3144 sc->sc_geom = gp; 3145 sc->sc_provider = NULL; 3146 sc->sc_provider_open = 0; 3147 /* 3148 * Synchronization geom. 3149 */ 3150 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3151 gp->softc = sc; 3152 gp->orphan = g_mirror_orphan; 3153 sc->sc_sync.ds_geom = gp; 3154 sc->sc_sync.ds_ndisks = 0; 3155 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3156 "g_mirror %s", md->md_name); 3157 if (error != 0) { 3158 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3159 sc->sc_name); 3160 g_destroy_geom(sc->sc_sync.ds_geom); 3161 g_destroy_geom(sc->sc_geom); 3162 g_mirror_free_device(sc); 3163 return (NULL); 3164 } 3165 3166 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3167 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3168 3169 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3170 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3171 3172 /* 3173 * Schedule startup timeout. 3174 */ 3175 timeout = g_mirror_timeout * hz; 3176 sc->sc_timeout_event = malloc(sizeof(struct g_mirror_event), M_MIRROR, 3177 M_WAITOK); 3178 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3179 return (sc->sc_geom); 3180 } 3181 3182 int 3183 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3184 { 3185 struct g_mirror_disk *disk; 3186 3187 g_topology_assert_not(); 3188 sx_assert(&sc->sc_lock, SX_XLOCKED); 3189 3190 if (sc->sc_provider_open != 0) { 3191 switch (how) { 3192 case G_MIRROR_DESTROY_SOFT: 3193 G_MIRROR_DEBUG(1, 3194 "Device %s is still open (%d).", sc->sc_name, 3195 sc->sc_provider_open); 3196 return (EBUSY); 3197 case G_MIRROR_DESTROY_DELAYED: 3198 G_MIRROR_DEBUG(1, 3199 "Device %s will be destroyed on last close.", 3200 sc->sc_name); 3201 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3202 if (disk->d_state == 3203 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3204 g_mirror_sync_stop(disk, 1); 3205 } 3206 } 3207 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; 3208 return (EBUSY); 3209 case G_MIRROR_DESTROY_HARD: 3210 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3211 "can't be definitely removed.", sc->sc_name); 3212 } 3213 } 3214 3215 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3216 sx_xunlock(&sc->sc_lock); 3217 return (0); 3218 } 3219 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3220 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; 3221 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3222 sx_xunlock(&sc->sc_lock); 3223 mtx_lock(&sc->sc_queue_mtx); 3224 wakeup(sc); 3225 mtx_unlock(&sc->sc_queue_mtx); 3226 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3227 while (sc->sc_worker != NULL) 3228 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3229 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3230 sx_xlock(&sc->sc_lock); 3231 g_mirror_destroy_device(sc); 3232 return (0); 3233 } 3234 3235 static void 3236 g_mirror_taste_orphan(struct g_consumer *cp) 3237 { 3238 3239 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3240 cp->provider->name)); 3241 } 3242 3243 static struct g_geom * 3244 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3245 { 3246 struct g_mirror_metadata md; 3247 struct g_mirror_softc *sc; 3248 struct g_consumer *cp; 3249 struct g_geom *gp; 3250 int error; 3251 3252 g_topology_assert(); 3253 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3254 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3255 3256 gp = g_new_geomf(mp, "mirror:taste"); 3257 /* 3258 * This orphan function should be never called. 3259 */ 3260 gp->orphan = g_mirror_taste_orphan; 3261 cp = g_new_consumer(gp); 3262 error = g_attach(cp, pp); 3263 if (error == 0) { 3264 error = g_mirror_read_metadata(cp, &md); 3265 g_detach(cp); 3266 } 3267 g_destroy_consumer(cp); 3268 g_destroy_geom(gp); 3269 if (error != 0) 3270 return (NULL); 3271 gp = NULL; 3272 3273 if (md.md_provider[0] != '\0' && 3274 !g_compare_names(md.md_provider, pp->name)) 3275 return (NULL); 3276 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3277 return (NULL); 3278 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3279 G_MIRROR_DEBUG(0, 3280 "Device %s: provider %s marked as inactive, skipping.", 3281 md.md_name, pp->name); 3282 return (NULL); 3283 } 3284 if (g_mirror_debug >= 2) 3285 mirror_metadata_dump(&md); 3286 3287 /* 3288 * Let's check if device already exists. 3289 */ 3290 sc = NULL; 3291 LIST_FOREACH(gp, &mp->geom, geom) { 3292 sc = gp->softc; 3293 if (sc == NULL) 3294 continue; 3295 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3296 continue; 3297 if (sc->sc_sync.ds_geom == gp) 3298 continue; 3299 if (strcmp(md.md_name, sc->sc_name) != 0) 3300 continue; 3301 if (md.md_mid != sc->sc_id) { 3302 G_MIRROR_DEBUG(0, "Device %s already configured.", 3303 sc->sc_name); 3304 return (NULL); 3305 } 3306 break; 3307 } 3308 if (gp == NULL) { 3309 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3310 if (gp == NULL) { 3311 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3312 md.md_name); 3313 return (NULL); 3314 } 3315 sc = gp->softc; 3316 } 3317 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3318 g_topology_unlock(); 3319 sx_xlock(&sc->sc_lock); 3320 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3321 error = g_mirror_add_disk(sc, pp, &md); 3322 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3323 if (error != 0) { 3324 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3325 pp->name, gp->name, error); 3326 if (LIST_EMPTY(&sc->sc_disks)) { 3327 g_cancel_event(sc); 3328 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3329 g_topology_lock(); 3330 return (NULL); 3331 } 3332 gp = NULL; 3333 } 3334 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3335 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3336 g_topology_lock(); 3337 return (NULL); 3338 } 3339 sx_xunlock(&sc->sc_lock); 3340 g_topology_lock(); 3341 return (gp); 3342 } 3343 3344 static void 3345 g_mirror_resize(struct g_consumer *cp) 3346 { 3347 struct g_mirror_disk *disk; 3348 3349 g_topology_assert(); 3350 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3351 3352 disk = cp->private; 3353 if (disk == NULL) 3354 return; 3355 g_topology_unlock(); 3356 g_mirror_update_metadata(disk); 3357 g_topology_lock(); 3358 } 3359 3360 static int 3361 g_mirror_destroy_geom(struct gctl_req *req __unused, 3362 struct g_class *mp __unused, struct g_geom *gp) 3363 { 3364 struct g_mirror_softc *sc; 3365 int error; 3366 3367 g_topology_unlock(); 3368 sc = gp->softc; 3369 sx_xlock(&sc->sc_lock); 3370 g_cancel_event(sc); 3371 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3372 if (error != 0) 3373 sx_xunlock(&sc->sc_lock); 3374 g_topology_lock(); 3375 return (error); 3376 } 3377 3378 static void 3379 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3380 struct g_consumer *cp, struct g_provider *pp) 3381 { 3382 struct g_mirror_softc *sc; 3383 3384 g_topology_assert(); 3385 3386 sc = gp->softc; 3387 if (sc == NULL) 3388 return; 3389 /* Skip synchronization geom. */ 3390 if (gp == sc->sc_sync.ds_geom) 3391 return; 3392 if (pp != NULL) { 3393 /* Nothing here. */ 3394 } else if (cp != NULL) { 3395 struct g_mirror_disk *disk; 3396 3397 disk = cp->private; 3398 if (disk == NULL) 3399 return; 3400 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3401 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3402 sbuf_printf(sb, "%s<Synchronized>", indent); 3403 if (disk->d_sync.ds_offset == 0) 3404 sbuf_cat(sb, "0%"); 3405 else 3406 sbuf_printf(sb, "%u%%", 3407 (u_int)((disk->d_sync.ds_offset * 100) / 3408 sc->sc_mediasize)); 3409 sbuf_cat(sb, "</Synchronized>\n"); 3410 if (disk->d_sync.ds_offset > 0) 3411 sbuf_printf(sb, "%s<BytesSynced>%jd" 3412 "</BytesSynced>\n", indent, 3413 (intmax_t)disk->d_sync.ds_offset); 3414 } 3415 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3416 disk->d_sync.ds_syncid); 3417 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3418 disk->d_genid); 3419 sbuf_printf(sb, "%s<Flags>", indent); 3420 if (disk->d_flags == 0) 3421 sbuf_cat(sb, "NONE"); 3422 else { 3423 int first = 1; 3424 3425 #define ADD_FLAG(flag, name) do { \ 3426 if ((disk->d_flags & (flag)) != 0) { \ 3427 if (!first) \ 3428 sbuf_cat(sb, ", "); \ 3429 else \ 3430 first = 0; \ 3431 sbuf_cat(sb, name); \ 3432 } \ 3433 } while (0) 3434 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3435 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3436 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3437 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3438 "SYNCHRONIZING"); 3439 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3440 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3441 #undef ADD_FLAG 3442 } 3443 sbuf_cat(sb, "</Flags>\n"); 3444 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3445 disk->d_priority); 3446 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3447 g_mirror_disk_state2str(disk->d_state)); 3448 } else { 3449 sbuf_printf(sb, "%s<Type>", indent); 3450 switch (sc->sc_type) { 3451 case G_MIRROR_TYPE_AUTOMATIC: 3452 sbuf_cat(sb, "AUTOMATIC"); 3453 break; 3454 case G_MIRROR_TYPE_MANUAL: 3455 sbuf_cat(sb, "MANUAL"); 3456 break; 3457 default: 3458 sbuf_cat(sb, "UNKNOWN"); 3459 break; 3460 } 3461 sbuf_cat(sb, "</Type>\n"); 3462 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3463 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3464 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3465 sbuf_printf(sb, "%s<Flags>", indent); 3466 if (sc->sc_flags == 0) 3467 sbuf_cat(sb, "NONE"); 3468 else { 3469 int first = 1; 3470 3471 #define ADD_FLAG(flag, name) do { \ 3472 if ((sc->sc_flags & (flag)) != 0) { \ 3473 if (!first) \ 3474 sbuf_cat(sb, ", "); \ 3475 else \ 3476 first = 0; \ 3477 sbuf_cat(sb, name); \ 3478 } \ 3479 } while (0) 3480 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3481 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3482 #undef ADD_FLAG 3483 } 3484 sbuf_cat(sb, "</Flags>\n"); 3485 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3486 (u_int)sc->sc_slice); 3487 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3488 balance_name(sc->sc_balance)); 3489 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3490 sc->sc_ndisks); 3491 sbuf_printf(sb, "%s<State>", indent); 3492 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3493 sbuf_printf(sb, "%s", "STARTING"); 3494 else if (sc->sc_ndisks == 3495 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3496 sbuf_printf(sb, "%s", "COMPLETE"); 3497 else 3498 sbuf_printf(sb, "%s", "DEGRADED"); 3499 sbuf_cat(sb, "</State>\n"); 3500 } 3501 } 3502 3503 static void 3504 g_mirror_shutdown_post_sync(void *arg, int howto) 3505 { 3506 struct g_class *mp; 3507 struct g_geom *gp, *gp2; 3508 struct g_mirror_softc *sc; 3509 int error; 3510 3511 if (KERNEL_PANICKED()) 3512 return; 3513 3514 mp = arg; 3515 g_topology_lock(); 3516 g_mirror_shutdown = 1; 3517 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3518 if ((sc = gp->softc) == NULL) 3519 continue; 3520 /* Skip synchronization geom. */ 3521 if (gp == sc->sc_sync.ds_geom) 3522 continue; 3523 g_topology_unlock(); 3524 sx_xlock(&sc->sc_lock); 3525 g_mirror_idle(sc, -1); 3526 g_cancel_event(sc); 3527 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3528 if (error != 0) 3529 sx_xunlock(&sc->sc_lock); 3530 g_topology_lock(); 3531 } 3532 g_topology_unlock(); 3533 } 3534 3535 static void 3536 g_mirror_init(struct g_class *mp) 3537 { 3538 3539 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3540 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3541 if (g_mirror_post_sync == NULL) 3542 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3543 } 3544 3545 static void 3546 g_mirror_fini(struct g_class *mp) 3547 { 3548 3549 if (g_mirror_post_sync != NULL) 3550 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3551 } 3552 3553 /* 3554 * Refresh the mirror device's metadata when gmirror encounters a newer 3555 * generation as the individual components are being added to the mirror set. 3556 */ 3557 static int 3558 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, 3559 const struct g_mirror_metadata *md) 3560 { 3561 3562 g_topology_assert_not(); 3563 sx_assert(&sc->sc_lock, SX_XLOCKED); 3564 3565 KASSERT(sc->sc_genid <= md->md_genid, 3566 ("%s: attempted to refresh from stale component %s (device %s) " 3567 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, 3568 sc->sc_genid)); 3569 3570 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && 3571 sc->sc_syncid >= md->md_syncid)) 3572 return (0); 3573 3574 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " 3575 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " 3576 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, 3577 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); 3578 3579 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { 3580 /* Probable data corruption detected */ 3581 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " 3582 "(device=%s genid=%u). A stale mirror device was launched.", 3583 g_mirror_device_state2str(sc->sc_state), sc->sc_name, 3584 sc->sc_genid); 3585 return (EINVAL); 3586 } 3587 3588 /* Update softc */ 3589 g_mirror_reinit_from_metadata(sc, md); 3590 3591 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " 3592 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, 3593 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, 3594 md->md_syncid, (unsigned)md->md_all); 3595 3596 return (0); 3597 } 3598 3599 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3600 MODULE_VERSION(geom_mirror, 0); 3601