1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/geom_disk.h> 52 #include <geom/mirror/g_mirror.h> 53 54 FEATURE(geom_mirror, "GEOM mirroring support"); 55 56 static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 57 58 SYSCTL_DECL(_kern_geom); 59 static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 60 "GEOM_MIRROR stuff"); 61 int g_mirror_debug = 0; 62 SYSCTL_INT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RWTUN, &g_mirror_debug, 0, 63 "Debug level"); 64 bool g_launch_mirror_before_timeout = true; 65 SYSCTL_BOOL(_kern_geom_mirror, OID_AUTO, launch_mirror_before_timeout, 66 CTLFLAG_RWTUN, &g_launch_mirror_before_timeout, 0, 67 "If false, force gmirror to wait out the full kern.geom.mirror.timeout " 68 "before launching mirrors"); 69 static u_int g_mirror_timeout = 4; 70 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_mirror_timeout, 71 0, "Time to wait on all mirror components"); 72 static u_int g_mirror_idletime = 5; 73 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RWTUN, 74 &g_mirror_idletime, 0, "Mark components as clean when idling"); 75 static u_int g_mirror_disconnect_on_failure = 1; 76 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN, 77 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 78 static u_int g_mirror_syncreqs = 2; 79 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 80 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 81 static u_int g_mirror_sync_period = 5; 82 SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_update_period, CTLFLAG_RWTUN, 83 &g_mirror_sync_period, 0, 84 "Metadata update period during synchronization, in seconds"); 85 86 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 87 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 88 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 89 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 90 } while (0) 91 92 static eventhandler_tag g_mirror_post_sync = NULL; 93 static int g_mirror_shutdown = 0; 94 95 static g_ctl_destroy_geom_t g_mirror_destroy_geom; 96 static g_taste_t g_mirror_taste; 97 static g_init_t g_mirror_init; 98 static g_fini_t g_mirror_fini; 99 static g_provgone_t g_mirror_providergone; 100 static g_resize_t g_mirror_resize; 101 102 struct g_class g_mirror_class = { 103 .name = G_MIRROR_CLASS_NAME, 104 .version = G_VERSION, 105 .ctlreq = g_mirror_config, 106 .taste = g_mirror_taste, 107 .destroy_geom = g_mirror_destroy_geom, 108 .init = g_mirror_init, 109 .fini = g_mirror_fini, 110 .providergone = g_mirror_providergone, 111 .resize = g_mirror_resize 112 }; 113 114 static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 115 static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 116 static void g_mirror_update_device(struct g_mirror_softc *sc, bool force); 117 static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 118 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 119 static void g_mirror_timeout_drain(struct g_mirror_softc *sc); 120 static int g_mirror_refresh_device(struct g_mirror_softc *sc, 121 const struct g_provider *pp, const struct g_mirror_metadata *md); 122 static void g_mirror_sync_reinit(const struct g_mirror_disk *disk, 123 struct bio *bp, off_t offset); 124 static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 125 static void g_mirror_register_request(struct g_mirror_softc *sc, 126 struct bio *bp); 127 static void g_mirror_sync_release(struct g_mirror_softc *sc); 128 129 static const char * 130 g_mirror_disk_state2str(int state) 131 { 132 133 switch (state) { 134 case G_MIRROR_DISK_STATE_NONE: 135 return ("NONE"); 136 case G_MIRROR_DISK_STATE_NEW: 137 return ("NEW"); 138 case G_MIRROR_DISK_STATE_ACTIVE: 139 return ("ACTIVE"); 140 case G_MIRROR_DISK_STATE_STALE: 141 return ("STALE"); 142 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 143 return ("SYNCHRONIZING"); 144 case G_MIRROR_DISK_STATE_DISCONNECTED: 145 return ("DISCONNECTED"); 146 case G_MIRROR_DISK_STATE_DESTROY: 147 return ("DESTROY"); 148 default: 149 return ("INVALID"); 150 } 151 } 152 153 static const char * 154 g_mirror_device_state2str(int state) 155 { 156 157 switch (state) { 158 case G_MIRROR_DEVICE_STATE_STARTING: 159 return ("STARTING"); 160 case G_MIRROR_DEVICE_STATE_RUNNING: 161 return ("RUNNING"); 162 default: 163 return ("INVALID"); 164 } 165 } 166 167 static const char * 168 g_mirror_get_diskname(struct g_mirror_disk *disk) 169 { 170 171 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 172 return ("[unknown]"); 173 return (disk->d_name); 174 } 175 176 /* 177 * --- Events handling functions --- 178 * Events in geom_mirror are used to maintain disks and device status 179 * from one thread to simplify locking. 180 */ 181 static void 182 g_mirror_event_free(struct g_mirror_event *ep) 183 { 184 185 free(ep, M_MIRROR); 186 } 187 188 static int 189 g_mirror_event_dispatch(struct g_mirror_event *ep, void *arg, int state, 190 int flags) 191 { 192 struct g_mirror_softc *sc; 193 struct g_mirror_disk *disk; 194 int error; 195 196 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 197 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 198 disk = NULL; 199 sc = arg; 200 } else { 201 disk = arg; 202 sc = disk->d_softc; 203 } 204 ep->e_disk = disk; 205 ep->e_state = state; 206 ep->e_flags = flags; 207 ep->e_error = 0; 208 mtx_lock(&sc->sc_events_mtx); 209 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 210 mtx_unlock(&sc->sc_events_mtx); 211 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 212 mtx_lock(&sc->sc_queue_mtx); 213 wakeup(sc); 214 mtx_unlock(&sc->sc_queue_mtx); 215 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 216 return (0); 217 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 218 sx_xunlock(&sc->sc_lock); 219 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 220 mtx_lock(&sc->sc_events_mtx); 221 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 222 hz * 5); 223 } 224 error = ep->e_error; 225 g_mirror_event_free(ep); 226 sx_xlock(&sc->sc_lock); 227 return (error); 228 } 229 230 int 231 g_mirror_event_send(void *arg, int state, int flags) 232 { 233 struct g_mirror_event *ep; 234 235 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 236 return (g_mirror_event_dispatch(ep, arg, state, flags)); 237 } 238 239 static struct g_mirror_event * 240 g_mirror_event_first(struct g_mirror_softc *sc) 241 { 242 struct g_mirror_event *ep; 243 244 mtx_lock(&sc->sc_events_mtx); 245 ep = TAILQ_FIRST(&sc->sc_events); 246 mtx_unlock(&sc->sc_events_mtx); 247 return (ep); 248 } 249 250 static void 251 g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 252 { 253 254 mtx_lock(&sc->sc_events_mtx); 255 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 256 mtx_unlock(&sc->sc_events_mtx); 257 } 258 259 static void 260 g_mirror_event_cancel(struct g_mirror_disk *disk) 261 { 262 struct g_mirror_softc *sc; 263 struct g_mirror_event *ep, *tmpep; 264 265 sc = disk->d_softc; 266 sx_assert(&sc->sc_lock, SX_XLOCKED); 267 268 mtx_lock(&sc->sc_events_mtx); 269 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 270 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 271 continue; 272 if (ep->e_disk != disk) 273 continue; 274 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 275 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 276 g_mirror_event_free(ep); 277 else { 278 ep->e_error = ECANCELED; 279 wakeup(ep); 280 } 281 } 282 mtx_unlock(&sc->sc_events_mtx); 283 } 284 285 /* 286 * Return the number of disks in given state. 287 * If state is equal to -1, count all connected disks. 288 */ 289 u_int 290 g_mirror_ndisks(struct g_mirror_softc *sc, int state) 291 { 292 struct g_mirror_disk *disk; 293 u_int n = 0; 294 295 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 296 if (state == -1 || disk->d_state == state) 297 n++; 298 } 299 return (n); 300 } 301 302 /* 303 * Find a disk in mirror by its disk ID. 304 */ 305 static struct g_mirror_disk * 306 g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 307 { 308 struct g_mirror_disk *disk; 309 310 sx_assert(&sc->sc_lock, SX_XLOCKED); 311 312 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 313 if (disk->d_id == id) 314 return (disk); 315 } 316 return (NULL); 317 } 318 319 static u_int 320 g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 321 { 322 struct bio *bp; 323 u_int nreqs = 0; 324 325 mtx_lock(&sc->sc_queue_mtx); 326 TAILQ_FOREACH(bp, &sc->sc_queue, bio_queue) { 327 if (bp->bio_from == cp) 328 nreqs++; 329 } 330 mtx_unlock(&sc->sc_queue_mtx); 331 return (nreqs); 332 } 333 334 static int 335 g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 336 { 337 338 if (cp->index > 0) { 339 G_MIRROR_DEBUG(2, 340 "I/O requests for %s exist, can't destroy it now.", 341 cp->provider->name); 342 return (1); 343 } 344 if (g_mirror_nrequests(sc, cp) > 0) { 345 G_MIRROR_DEBUG(2, 346 "I/O requests for %s in queue, can't destroy it now.", 347 cp->provider->name); 348 return (1); 349 } 350 return (0); 351 } 352 353 static void 354 g_mirror_destroy_consumer(void *arg, int flags __unused) 355 { 356 struct g_consumer *cp; 357 358 g_topology_assert(); 359 360 cp = arg; 361 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 362 g_detach(cp); 363 g_destroy_consumer(cp); 364 } 365 366 static void 367 g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 368 { 369 struct g_provider *pp; 370 int retaste_wait; 371 372 g_topology_assert(); 373 374 cp->private = NULL; 375 if (g_mirror_is_busy(sc, cp)) 376 return; 377 pp = cp->provider; 378 retaste_wait = 0; 379 if (cp->acw == 1) { 380 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 381 retaste_wait = 1; 382 } 383 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 384 -cp->acw, -cp->ace, 0); 385 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 386 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 387 if (retaste_wait) { 388 /* 389 * After retaste event was send (inside g_access()), we can send 390 * event to detach and destroy consumer. 391 * A class, which has consumer to the given provider connected 392 * will not receive retaste event for the provider. 393 * This is the way how I ignore retaste events when I close 394 * consumers opened for write: I detach and destroy consumer 395 * after retaste event is sent. 396 */ 397 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 398 return; 399 } 400 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 401 g_detach(cp); 402 g_destroy_consumer(cp); 403 } 404 405 static int 406 g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 407 { 408 struct g_consumer *cp; 409 int error; 410 411 g_topology_assert_not(); 412 KASSERT(disk->d_consumer == NULL, 413 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 414 415 g_topology_lock(); 416 cp = g_new_consumer(disk->d_softc->sc_geom); 417 cp->flags |= G_CF_DIRECT_RECEIVE; 418 error = g_attach(cp, pp); 419 if (error != 0) { 420 g_destroy_consumer(cp); 421 g_topology_unlock(); 422 return (error); 423 } 424 error = g_access(cp, 1, 1, 1); 425 if (error != 0) { 426 g_detach(cp); 427 g_destroy_consumer(cp); 428 g_topology_unlock(); 429 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 430 pp->name, error); 431 return (error); 432 } 433 g_topology_unlock(); 434 disk->d_consumer = cp; 435 disk->d_consumer->private = disk; 436 disk->d_consumer->index = 0; 437 438 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 439 return (0); 440 } 441 442 static void 443 g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 444 { 445 446 g_topology_assert(); 447 448 if (cp == NULL) 449 return; 450 if (cp->provider != NULL) 451 g_mirror_kill_consumer(sc, cp); 452 else 453 g_destroy_consumer(cp); 454 } 455 456 /* 457 * Initialize disk. This means allocate memory, create consumer, attach it 458 * to the provider and open access (r1w1e1) to it. 459 */ 460 static struct g_mirror_disk * 461 g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 462 struct g_mirror_metadata *md, int *errorp) 463 { 464 struct g_mirror_disk *disk; 465 int i, error; 466 467 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 468 if (disk == NULL) { 469 error = ENOMEM; 470 goto fail; 471 } 472 disk->d_softc = sc; 473 error = g_mirror_connect_disk(disk, pp); 474 if (error != 0) 475 goto fail; 476 disk->d_id = md->md_did; 477 disk->d_state = G_MIRROR_DISK_STATE_NONE; 478 disk->d_priority = md->md_priority; 479 disk->d_flags = md->md_dflags; 480 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 481 if (error == 0 && i != 0) 482 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 483 error = g_getattr("GEOM::rotation_rate", disk->d_consumer, 484 &disk->d_rotation_rate); 485 if (error) 486 disk->d_rotation_rate = DISK_RR_UNKNOWN; 487 if (md->md_provider[0] != '\0') 488 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 489 disk->d_sync.ds_consumer = NULL; 490 disk->d_sync.ds_offset = md->md_sync_offset; 491 disk->d_sync.ds_offset_done = md->md_sync_offset; 492 disk->d_sync.ds_update_ts = time_uptime; 493 disk->d_genid = md->md_genid; 494 disk->d_sync.ds_syncid = md->md_syncid; 495 disk->d_init_ndisks = md->md_all; 496 disk->d_init_slice = md->md_slice; 497 disk->d_init_balance = md->md_balance; 498 disk->d_init_mediasize = md->md_mediasize; 499 if (errorp != NULL) 500 *errorp = 0; 501 return (disk); 502 fail: 503 if (errorp != NULL) 504 *errorp = error; 505 if (disk != NULL) 506 free(disk, M_MIRROR); 507 return (NULL); 508 } 509 510 static void 511 g_mirror_destroy_disk(struct g_mirror_disk *disk) 512 { 513 struct g_mirror_softc *sc; 514 515 g_topology_assert_not(); 516 sc = disk->d_softc; 517 sx_assert(&sc->sc_lock, SX_XLOCKED); 518 519 g_topology_lock(); 520 LIST_REMOVE(disk, d_next); 521 g_topology_unlock(); 522 g_mirror_event_cancel(disk); 523 if (sc->sc_hint == disk) 524 sc->sc_hint = NULL; 525 switch (disk->d_state) { 526 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 527 g_mirror_sync_stop(disk, 1); 528 /* FALLTHROUGH */ 529 case G_MIRROR_DISK_STATE_NEW: 530 case G_MIRROR_DISK_STATE_STALE: 531 case G_MIRROR_DISK_STATE_ACTIVE: 532 g_topology_lock(); 533 g_mirror_disconnect_consumer(sc, disk->d_consumer); 534 g_topology_unlock(); 535 free(disk, M_MIRROR); 536 break; 537 default: 538 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 539 g_mirror_get_diskname(disk), 540 g_mirror_disk_state2str(disk->d_state))); 541 } 542 } 543 544 static void 545 g_mirror_free_device(struct g_mirror_softc *sc) 546 { 547 548 g_topology_assert(); 549 550 mtx_destroy(&sc->sc_queue_mtx); 551 mtx_destroy(&sc->sc_events_mtx); 552 mtx_destroy(&sc->sc_done_mtx); 553 sx_destroy(&sc->sc_lock); 554 free(sc, M_MIRROR); 555 } 556 557 static void 558 g_mirror_providergone(struct g_provider *pp) 559 { 560 struct g_mirror_softc *sc = pp->private; 561 562 if ((--sc->sc_refcnt) == 0) 563 g_mirror_free_device(sc); 564 } 565 566 static void 567 g_mirror_destroy_device(struct g_mirror_softc *sc) 568 { 569 struct g_mirror_disk *disk; 570 struct g_mirror_event *ep; 571 struct g_geom *gp; 572 struct g_consumer *cp, *tmpcp; 573 574 g_topology_assert_not(); 575 sx_assert(&sc->sc_lock, SX_XLOCKED); 576 577 gp = sc->sc_geom; 578 if (sc->sc_provider != NULL) 579 g_mirror_destroy_provider(sc); 580 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 581 disk = LIST_FIRST(&sc->sc_disks)) { 582 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 583 g_mirror_update_metadata(disk); 584 g_mirror_destroy_disk(disk); 585 } 586 while ((ep = g_mirror_event_first(sc)) != NULL) { 587 g_mirror_event_remove(sc, ep); 588 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 589 g_mirror_event_free(ep); 590 else { 591 ep->e_error = ECANCELED; 592 ep->e_flags |= G_MIRROR_EVENT_DONE; 593 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 594 mtx_lock(&sc->sc_events_mtx); 595 wakeup(ep); 596 mtx_unlock(&sc->sc_events_mtx); 597 } 598 } 599 g_mirror_timeout_drain(sc); 600 601 g_topology_lock(); 602 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 603 g_mirror_disconnect_consumer(sc, cp); 604 } 605 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 606 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 607 g_wither_geom(gp, ENXIO); 608 sx_xunlock(&sc->sc_lock); 609 if ((--sc->sc_refcnt) == 0) 610 g_mirror_free_device(sc); 611 g_topology_unlock(); 612 } 613 614 static void 615 g_mirror_orphan(struct g_consumer *cp) 616 { 617 struct g_mirror_disk *disk; 618 619 g_topology_assert(); 620 621 disk = cp->private; 622 if (disk == NULL) 623 return; 624 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 625 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 626 G_MIRROR_EVENT_DONTWAIT); 627 } 628 629 /* 630 * Function should return the next active disk on the list. 631 * It is possible that it will be the same disk as given. 632 * If there are no active disks on list, NULL is returned. 633 */ 634 static __inline struct g_mirror_disk * 635 g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 636 { 637 struct g_mirror_disk *dp; 638 639 for (dp = LIST_NEXT(disk, d_next); dp != disk; 640 dp = LIST_NEXT(dp, d_next)) { 641 if (dp == NULL) 642 dp = LIST_FIRST(&sc->sc_disks); 643 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 644 break; 645 } 646 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 647 return (NULL); 648 return (dp); 649 } 650 651 static struct g_mirror_disk * 652 g_mirror_get_disk(struct g_mirror_softc *sc) 653 { 654 struct g_mirror_disk *disk; 655 656 if (sc->sc_hint == NULL) { 657 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 658 if (sc->sc_hint == NULL) 659 return (NULL); 660 } 661 disk = sc->sc_hint; 662 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 663 disk = g_mirror_find_next(sc, disk); 664 if (disk == NULL) 665 return (NULL); 666 } 667 sc->sc_hint = g_mirror_find_next(sc, disk); 668 return (disk); 669 } 670 671 static int 672 g_mirror_write_metadata(struct g_mirror_disk *disk, 673 struct g_mirror_metadata *md) 674 { 675 struct g_mirror_softc *sc; 676 struct g_consumer *cp; 677 off_t offset, length; 678 u_char *sector; 679 int error = 0; 680 681 g_topology_assert_not(); 682 sc = disk->d_softc; 683 sx_assert(&sc->sc_lock, SX_LOCKED); 684 685 cp = disk->d_consumer; 686 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 687 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 688 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 689 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 690 cp->acw, cp->ace)); 691 length = cp->provider->sectorsize; 692 offset = cp->provider->mediasize - length; 693 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 694 if (md != NULL && 695 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 696 /* 697 * Handle the case, when the size of parent provider reduced. 698 */ 699 if (offset < md->md_mediasize) 700 error = ENOSPC; 701 else 702 mirror_metadata_encode(md, sector); 703 } 704 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_metadata_write, error); 705 if (error == 0) 706 error = g_write_data(cp, offset, sector, length); 707 free(sector, M_MIRROR); 708 if (error != 0) { 709 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 710 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 711 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 712 "(device=%s, error=%d).", 713 g_mirror_get_diskname(disk), sc->sc_name, error); 714 } else { 715 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 716 "(device=%s, error=%d).", 717 g_mirror_get_diskname(disk), sc->sc_name, error); 718 } 719 if (g_mirror_disconnect_on_failure && 720 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 721 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 722 g_mirror_event_send(disk, 723 G_MIRROR_DISK_STATE_DISCONNECTED, 724 G_MIRROR_EVENT_DONTWAIT); 725 } 726 } 727 return (error); 728 } 729 730 static int 731 g_mirror_clear_metadata(struct g_mirror_disk *disk) 732 { 733 int error; 734 735 g_topology_assert_not(); 736 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 737 738 if (disk->d_softc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 739 return (0); 740 error = g_mirror_write_metadata(disk, NULL); 741 if (error == 0) { 742 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 743 g_mirror_get_diskname(disk)); 744 } else { 745 G_MIRROR_DEBUG(0, 746 "Cannot clear metadata on disk %s (error=%d).", 747 g_mirror_get_diskname(disk), error); 748 } 749 return (error); 750 } 751 752 void 753 g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 754 struct g_mirror_metadata *md) 755 { 756 757 bzero(md, sizeof(*md)); 758 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 759 md->md_version = G_MIRROR_VERSION; 760 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 761 md->md_mid = sc->sc_id; 762 md->md_all = sc->sc_ndisks; 763 md->md_slice = sc->sc_slice; 764 md->md_balance = sc->sc_balance; 765 md->md_genid = sc->sc_genid; 766 md->md_mediasize = sc->sc_mediasize; 767 md->md_sectorsize = sc->sc_sectorsize; 768 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 769 if (disk == NULL) { 770 md->md_did = arc4random(); 771 } else { 772 md->md_did = disk->d_id; 773 md->md_priority = disk->d_priority; 774 md->md_syncid = disk->d_sync.ds_syncid; 775 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 776 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 777 md->md_sync_offset = disk->d_sync.ds_offset_done; 778 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 779 strlcpy(md->md_provider, 780 disk->d_consumer->provider->name, 781 sizeof(md->md_provider)); 782 } 783 md->md_provsize = disk->d_consumer->provider->mediasize; 784 } 785 } 786 787 void 788 g_mirror_update_metadata(struct g_mirror_disk *disk) 789 { 790 struct g_mirror_softc *sc; 791 struct g_mirror_metadata md; 792 int error; 793 794 g_topology_assert_not(); 795 sc = disk->d_softc; 796 sx_assert(&sc->sc_lock, SX_LOCKED); 797 798 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 799 return; 800 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 801 g_mirror_fill_metadata(sc, disk, &md); 802 error = g_mirror_write_metadata(disk, &md); 803 if (error == 0) { 804 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 805 g_mirror_get_diskname(disk)); 806 } else { 807 G_MIRROR_DEBUG(0, 808 "Cannot update metadata on disk %s (error=%d).", 809 g_mirror_get_diskname(disk), error); 810 } 811 } 812 813 static void 814 g_mirror_bump_syncid(struct g_mirror_softc *sc) 815 { 816 struct g_mirror_disk *disk; 817 818 g_topology_assert_not(); 819 sx_assert(&sc->sc_lock, SX_XLOCKED); 820 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 821 ("%s called with no active disks (device=%s).", __func__, 822 sc->sc_name)); 823 824 sc->sc_syncid++; 825 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 826 sc->sc_syncid); 827 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 828 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 829 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 830 disk->d_sync.ds_syncid = sc->sc_syncid; 831 g_mirror_update_metadata(disk); 832 } 833 } 834 } 835 836 static void 837 g_mirror_bump_genid(struct g_mirror_softc *sc) 838 { 839 struct g_mirror_disk *disk; 840 841 g_topology_assert_not(); 842 sx_assert(&sc->sc_lock, SX_XLOCKED); 843 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 844 ("%s called with no active disks (device=%s).", __func__, 845 sc->sc_name)); 846 847 sc->sc_genid++; 848 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 849 sc->sc_genid); 850 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 851 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 852 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 853 disk->d_genid = sc->sc_genid; 854 g_mirror_update_metadata(disk); 855 } 856 } 857 } 858 859 static int 860 g_mirror_idle(struct g_mirror_softc *sc, int acw) 861 { 862 struct g_mirror_disk *disk; 863 int timeout; 864 865 g_topology_assert_not(); 866 sx_assert(&sc->sc_lock, SX_XLOCKED); 867 868 if (sc->sc_provider == NULL) 869 return (0); 870 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 871 return (0); 872 if (sc->sc_idle) 873 return (0); 874 if (sc->sc_writes > 0) 875 return (0); 876 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 877 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 878 if (!g_mirror_shutdown && timeout > 0) 879 return (timeout); 880 } 881 sc->sc_idle = 1; 882 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 883 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 884 continue; 885 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 886 g_mirror_get_diskname(disk), sc->sc_name); 887 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 888 g_mirror_update_metadata(disk); 889 } 890 return (0); 891 } 892 893 static void 894 g_mirror_unidle(struct g_mirror_softc *sc) 895 { 896 struct g_mirror_disk *disk; 897 898 g_topology_assert_not(); 899 sx_assert(&sc->sc_lock, SX_XLOCKED); 900 901 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 902 return; 903 sc->sc_idle = 0; 904 sc->sc_last_write = time_uptime; 905 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 906 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 907 continue; 908 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 909 g_mirror_get_diskname(disk), sc->sc_name); 910 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 911 g_mirror_update_metadata(disk); 912 } 913 } 914 915 static void 916 g_mirror_done(struct bio *bp) 917 { 918 struct g_mirror_softc *sc; 919 920 sc = bp->bio_from->geom->softc; 921 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 922 mtx_lock(&sc->sc_queue_mtx); 923 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 924 mtx_unlock(&sc->sc_queue_mtx); 925 wakeup(sc); 926 } 927 928 static void 929 g_mirror_regular_request_error(struct g_mirror_softc *sc, 930 struct g_mirror_disk *disk, struct bio *bp) 931 { 932 933 if ((bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) && 934 bp->bio_error == EOPNOTSUPP) 935 return; 936 937 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 938 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 939 G_MIRROR_LOGREQ(0, bp, "Request failed (error=%d).", 940 bp->bio_error); 941 } else { 942 G_MIRROR_LOGREQ(1, bp, "Request failed (error=%d).", 943 bp->bio_error); 944 } 945 if (g_mirror_disconnect_on_failure && 946 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 947 if (bp->bio_error == ENXIO && 948 bp->bio_cmd == BIO_READ) 949 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 950 else if (bp->bio_error == ENXIO) 951 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID_NOW; 952 else 953 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 954 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 955 G_MIRROR_EVENT_DONTWAIT); 956 } 957 } 958 959 static void 960 g_mirror_regular_request(struct g_mirror_softc *sc, struct bio *bp) 961 { 962 struct g_mirror_disk *disk; 963 struct bio *pbp; 964 965 g_topology_assert_not(); 966 KASSERT(sc->sc_provider == bp->bio_parent->bio_to, 967 ("regular request %p with unexpected origin", bp)); 968 969 pbp = bp->bio_parent; 970 bp->bio_from->index--; 971 if (bp->bio_cmd == BIO_WRITE || bp->bio_cmd == BIO_DELETE) 972 sc->sc_writes--; 973 disk = bp->bio_from->private; 974 if (disk == NULL) { 975 g_topology_lock(); 976 g_mirror_kill_consumer(sc, bp->bio_from); 977 g_topology_unlock(); 978 } 979 980 switch (bp->bio_cmd) { 981 case BIO_READ: 982 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_read, 983 bp->bio_error); 984 break; 985 case BIO_WRITE: 986 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_write, 987 bp->bio_error); 988 break; 989 case BIO_DELETE: 990 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_delete, 991 bp->bio_error); 992 break; 993 case BIO_FLUSH: 994 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_flush, 995 bp->bio_error); 996 break; 997 case BIO_SPEEDUP: 998 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_regular_request_speedup, 999 bp->bio_error); 1000 break; 1001 } 1002 1003 pbp->bio_inbed++; 1004 KASSERT(pbp->bio_inbed <= pbp->bio_children, 1005 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 1006 pbp->bio_children)); 1007 if (bp->bio_error == 0 && pbp->bio_error == 0) { 1008 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 1009 g_destroy_bio(bp); 1010 if (pbp->bio_children == pbp->bio_inbed) { 1011 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 1012 pbp->bio_completed = pbp->bio_length; 1013 if (pbp->bio_cmd == BIO_WRITE || 1014 pbp->bio_cmd == BIO_DELETE) { 1015 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1016 /* Release delayed sync requests if possible. */ 1017 g_mirror_sync_release(sc); 1018 } 1019 g_io_deliver(pbp, pbp->bio_error); 1020 } 1021 return; 1022 } else if (bp->bio_error != 0) { 1023 if (pbp->bio_error == 0) 1024 pbp->bio_error = bp->bio_error; 1025 if (disk != NULL) 1026 g_mirror_regular_request_error(sc, disk, bp); 1027 switch (pbp->bio_cmd) { 1028 case BIO_DELETE: 1029 case BIO_WRITE: 1030 case BIO_FLUSH: 1031 case BIO_SPEEDUP: 1032 pbp->bio_inbed--; 1033 pbp->bio_children--; 1034 break; 1035 } 1036 } 1037 g_destroy_bio(bp); 1038 1039 switch (pbp->bio_cmd) { 1040 case BIO_READ: 1041 if (pbp->bio_inbed < pbp->bio_children) 1042 break; 1043 1044 /* 1045 * If there is only one active disk we want to double-check that 1046 * it is, in fact, the disk that we already tried. This is 1047 * necessary because we might have just lost a race with a 1048 * removal of the tried disk (likely because of the same error) 1049 * and the only remaining disk is still viable for a retry. 1050 */ 1051 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1 && 1052 disk != NULL && 1053 disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) { 1054 g_io_deliver(pbp, pbp->bio_error); 1055 } else { 1056 pbp->bio_error = 0; 1057 mtx_lock(&sc->sc_queue_mtx); 1058 TAILQ_INSERT_TAIL(&sc->sc_queue, pbp, bio_queue); 1059 mtx_unlock(&sc->sc_queue_mtx); 1060 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1061 wakeup(sc); 1062 } 1063 break; 1064 case BIO_DELETE: 1065 case BIO_WRITE: 1066 case BIO_FLUSH: 1067 case BIO_SPEEDUP: 1068 if (pbp->bio_children == 0) { 1069 /* 1070 * All requests failed. 1071 */ 1072 } else if (pbp->bio_inbed < pbp->bio_children) { 1073 /* Do nothing. */ 1074 break; 1075 } else if (pbp->bio_children == pbp->bio_inbed) { 1076 /* Some requests succeeded. */ 1077 pbp->bio_error = 0; 1078 pbp->bio_completed = pbp->bio_length; 1079 } 1080 if (pbp->bio_cmd == BIO_WRITE || pbp->bio_cmd == BIO_DELETE) { 1081 TAILQ_REMOVE(&sc->sc_inflight, pbp, bio_queue); 1082 /* Release delayed sync requests if possible. */ 1083 g_mirror_sync_release(sc); 1084 } 1085 g_io_deliver(pbp, pbp->bio_error); 1086 break; 1087 default: 1088 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1089 break; 1090 } 1091 } 1092 1093 static void 1094 g_mirror_sync_done(struct bio *bp) 1095 { 1096 struct g_mirror_softc *sc; 1097 1098 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1099 sc = bp->bio_from->geom->softc; 1100 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1101 mtx_lock(&sc->sc_queue_mtx); 1102 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1103 mtx_unlock(&sc->sc_queue_mtx); 1104 wakeup(sc); 1105 } 1106 1107 static void 1108 g_mirror_candelete(struct bio *bp) 1109 { 1110 struct g_mirror_softc *sc; 1111 struct g_mirror_disk *disk; 1112 int val; 1113 1114 sc = bp->bio_to->private; 1115 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1116 if (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) 1117 break; 1118 } 1119 val = disk != NULL; 1120 g_handleattr(bp, "GEOM::candelete", &val, sizeof(val)); 1121 } 1122 1123 static void 1124 g_mirror_kernel_dump(struct bio *bp) 1125 { 1126 struct g_mirror_softc *sc; 1127 struct g_mirror_disk *disk; 1128 struct bio *cbp; 1129 struct g_kerneldump *gkd; 1130 1131 /* 1132 * We configure dumping to the first component, because this component 1133 * will be used for reading with 'prefer' balance algorithm. 1134 * If the component with the highest priority is currently disconnected 1135 * we will not be able to read the dump after the reboot if it will be 1136 * connected and synchronized later. Can we do something better? 1137 */ 1138 sc = bp->bio_to->private; 1139 disk = LIST_FIRST(&sc->sc_disks); 1140 1141 gkd = (struct g_kerneldump *)bp->bio_data; 1142 if (gkd->length > bp->bio_to->mediasize) 1143 gkd->length = bp->bio_to->mediasize; 1144 cbp = g_clone_bio(bp); 1145 if (cbp == NULL) { 1146 g_io_deliver(bp, ENOMEM); 1147 return; 1148 } 1149 cbp->bio_done = g_std_done; 1150 g_io_request(cbp, disk->d_consumer); 1151 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1152 g_mirror_get_diskname(disk)); 1153 } 1154 1155 static void 1156 g_mirror_rotation_rate(struct bio *bp) 1157 { 1158 struct g_mirror_softc *sc; 1159 struct g_mirror_disk *disk; 1160 bool first = true; 1161 uint16_t rr = DISK_RR_UNKNOWN; 1162 1163 sc = bp->bio_to->private; 1164 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1165 if (first) 1166 rr = disk->d_rotation_rate; 1167 else if (rr != disk->d_rotation_rate) { 1168 rr = DISK_RR_UNKNOWN; 1169 break; 1170 } 1171 first = false; 1172 } 1173 g_handleattr(bp, "GEOM::rotation_rate", &rr, sizeof(rr)); 1174 } 1175 1176 static void 1177 g_mirror_start(struct bio *bp) 1178 { 1179 struct g_mirror_softc *sc; 1180 1181 sc = bp->bio_to->private; 1182 /* 1183 * If sc == NULL or there are no valid disks, provider's error 1184 * should be set and g_mirror_start() should not be called at all. 1185 */ 1186 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1187 ("Provider's error should be set (error=%d)(mirror=%s).", 1188 bp->bio_to->error, bp->bio_to->name)); 1189 G_MIRROR_LOGREQ(3, bp, "Request received."); 1190 1191 switch (bp->bio_cmd) { 1192 case BIO_READ: 1193 case BIO_WRITE: 1194 case BIO_DELETE: 1195 case BIO_SPEEDUP: 1196 case BIO_FLUSH: 1197 break; 1198 case BIO_GETATTR: 1199 if (!strcmp(bp->bio_attribute, "GEOM::candelete")) { 1200 g_mirror_candelete(bp); 1201 return; 1202 } else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1203 g_mirror_kernel_dump(bp); 1204 return; 1205 } else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) { 1206 g_mirror_rotation_rate(bp); 1207 return; 1208 } 1209 /* FALLTHROUGH */ 1210 default: 1211 g_io_deliver(bp, EOPNOTSUPP); 1212 return; 1213 } 1214 mtx_lock(&sc->sc_queue_mtx); 1215 if (bp->bio_to->error != 0) { 1216 mtx_unlock(&sc->sc_queue_mtx); 1217 g_io_deliver(bp, bp->bio_to->error); 1218 return; 1219 } 1220 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 1221 mtx_unlock(&sc->sc_queue_mtx); 1222 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1223 wakeup(sc); 1224 } 1225 1226 /* 1227 * Return TRUE if the given request is colliding with a in-progress 1228 * synchronization request. 1229 */ 1230 static bool 1231 g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1232 { 1233 struct g_mirror_disk *disk; 1234 struct bio *sbp; 1235 off_t rstart, rend, sstart, send; 1236 u_int i; 1237 1238 if (sc->sc_sync.ds_ndisks == 0) 1239 return (false); 1240 rstart = bp->bio_offset; 1241 rend = bp->bio_offset + bp->bio_length; 1242 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1243 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1244 continue; 1245 for (i = 0; i < g_mirror_syncreqs; i++) { 1246 sbp = disk->d_sync.ds_bios[i]; 1247 if (sbp == NULL) 1248 continue; 1249 sstart = sbp->bio_offset; 1250 send = sbp->bio_offset + sbp->bio_length; 1251 if (rend > sstart && rstart < send) 1252 return (true); 1253 } 1254 } 1255 return (false); 1256 } 1257 1258 /* 1259 * Return TRUE if the given sync request is colliding with a in-progress regular 1260 * request. 1261 */ 1262 static bool 1263 g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1264 { 1265 off_t rstart, rend, sstart, send; 1266 struct bio *bp; 1267 1268 if (sc->sc_sync.ds_ndisks == 0) 1269 return (false); 1270 sstart = sbp->bio_offset; 1271 send = sbp->bio_offset + sbp->bio_length; 1272 TAILQ_FOREACH(bp, &sc->sc_inflight, bio_queue) { 1273 rstart = bp->bio_offset; 1274 rend = bp->bio_offset + bp->bio_length; 1275 if (rend > sstart && rstart < send) 1276 return (true); 1277 } 1278 return (false); 1279 } 1280 1281 /* 1282 * Puts regular request onto delayed queue. 1283 */ 1284 static void 1285 g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1286 { 1287 1288 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1289 TAILQ_INSERT_TAIL(&sc->sc_regular_delayed, bp, bio_queue); 1290 } 1291 1292 /* 1293 * Puts synchronization request onto delayed queue. 1294 */ 1295 static void 1296 g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1297 { 1298 1299 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1300 TAILQ_INSERT_TAIL(&sc->sc_sync_delayed, bp, bio_queue); 1301 } 1302 1303 /* 1304 * Requeue delayed regular requests. 1305 */ 1306 static void 1307 g_mirror_regular_release(struct g_mirror_softc *sc) 1308 { 1309 struct bio *bp; 1310 1311 if ((bp = TAILQ_FIRST(&sc->sc_regular_delayed)) == NULL) 1312 return; 1313 if (g_mirror_sync_collision(sc, bp)) 1314 return; 1315 1316 G_MIRROR_DEBUG(2, "Requeuing regular requests after collision."); 1317 mtx_lock(&sc->sc_queue_mtx); 1318 TAILQ_CONCAT(&sc->sc_regular_delayed, &sc->sc_queue, bio_queue); 1319 TAILQ_SWAP(&sc->sc_regular_delayed, &sc->sc_queue, bio, bio_queue); 1320 mtx_unlock(&sc->sc_queue_mtx); 1321 } 1322 1323 /* 1324 * Releases delayed sync requests which don't collide anymore with regular 1325 * requests. 1326 */ 1327 static void 1328 g_mirror_sync_release(struct g_mirror_softc *sc) 1329 { 1330 struct bio *bp, *bp2; 1331 1332 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed, bio_queue, bp2) { 1333 if (g_mirror_regular_collision(sc, bp)) 1334 continue; 1335 TAILQ_REMOVE(&sc->sc_sync_delayed, bp, bio_queue); 1336 G_MIRROR_LOGREQ(2, bp, 1337 "Releasing delayed synchronization request."); 1338 g_io_request(bp, bp->bio_from); 1339 } 1340 } 1341 1342 /* 1343 * Free a synchronization request and clear its slot in the array. 1344 */ 1345 static void 1346 g_mirror_sync_request_free(struct g_mirror_disk *disk, struct bio *bp) 1347 { 1348 int idx; 1349 1350 if (disk != NULL && disk->d_sync.ds_bios != NULL) { 1351 idx = (int)(uintptr_t)bp->bio_caller1; 1352 KASSERT(disk->d_sync.ds_bios[idx] == bp, 1353 ("unexpected sync BIO at %p:%d", disk, idx)); 1354 disk->d_sync.ds_bios[idx] = NULL; 1355 } 1356 free(bp->bio_data, M_MIRROR); 1357 g_destroy_bio(bp); 1358 } 1359 1360 /* 1361 * Handle synchronization requests. 1362 * Every synchronization request is a two-step process: first, a read request is 1363 * sent to the mirror provider via the sync consumer. If that request completes 1364 * successfully, it is converted to a write and sent to the disk being 1365 * synchronized. If the write also completes successfully, the synchronization 1366 * offset is advanced and a new read request is submitted. 1367 */ 1368 static void 1369 g_mirror_sync_request(struct g_mirror_softc *sc, struct bio *bp) 1370 { 1371 struct g_mirror_disk *disk; 1372 struct g_mirror_disk_sync *sync; 1373 1374 KASSERT((bp->bio_cmd == BIO_READ && 1375 bp->bio_from->geom == sc->sc_sync.ds_geom) || 1376 (bp->bio_cmd == BIO_WRITE && bp->bio_from->geom == sc->sc_geom), 1377 ("Sync BIO %p with unexpected origin", bp)); 1378 1379 bp->bio_from->index--; 1380 disk = bp->bio_from->private; 1381 if (disk == NULL) { 1382 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1383 g_topology_lock(); 1384 g_mirror_kill_consumer(sc, bp->bio_from); 1385 g_topology_unlock(); 1386 g_mirror_sync_request_free(NULL, bp); 1387 sx_xlock(&sc->sc_lock); 1388 return; 1389 } 1390 1391 sync = &disk->d_sync; 1392 1393 /* 1394 * Synchronization request. 1395 */ 1396 switch (bp->bio_cmd) { 1397 case BIO_READ: { 1398 struct g_consumer *cp; 1399 1400 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_read, 1401 bp->bio_error); 1402 1403 if (bp->bio_error != 0) { 1404 G_MIRROR_LOGREQ(0, bp, 1405 "Synchronization request failed (error=%d).", 1406 bp->bio_error); 1407 1408 /* 1409 * The read error will trigger a syncid bump, so there's 1410 * no need to do that here. 1411 * 1412 * The read error handling for regular requests will 1413 * retry the read from all active mirrors before passing 1414 * the error back up, so there's no need to retry here. 1415 */ 1416 g_mirror_sync_request_free(disk, bp); 1417 g_mirror_event_send(disk, 1418 G_MIRROR_DISK_STATE_DISCONNECTED, 1419 G_MIRROR_EVENT_DONTWAIT); 1420 return; 1421 } 1422 G_MIRROR_LOGREQ(3, bp, 1423 "Synchronization request half-finished."); 1424 bp->bio_cmd = BIO_WRITE; 1425 bp->bio_cflags = 0; 1426 cp = disk->d_consumer; 1427 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1428 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1429 cp->acr, cp->acw, cp->ace)); 1430 cp->index++; 1431 g_io_request(bp, cp); 1432 return; 1433 } 1434 case BIO_WRITE: { 1435 off_t offset; 1436 int i; 1437 1438 KFAIL_POINT_ERROR(DEBUG_FP, g_mirror_sync_request_write, 1439 bp->bio_error); 1440 1441 if (bp->bio_error != 0) { 1442 G_MIRROR_LOGREQ(0, bp, 1443 "Synchronization request failed (error=%d).", 1444 bp->bio_error); 1445 g_mirror_sync_request_free(disk, bp); 1446 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1447 g_mirror_event_send(disk, 1448 G_MIRROR_DISK_STATE_DISCONNECTED, 1449 G_MIRROR_EVENT_DONTWAIT); 1450 return; 1451 } 1452 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1453 if (sync->ds_offset >= sc->sc_mediasize || 1454 sync->ds_consumer == NULL || 1455 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1456 /* Don't send more synchronization requests. */ 1457 sync->ds_inflight--; 1458 g_mirror_sync_request_free(disk, bp); 1459 if (sync->ds_inflight > 0) 1460 return; 1461 if (sync->ds_consumer == NULL || 1462 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1463 return; 1464 } 1465 /* Disk up-to-date, activate it. */ 1466 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1467 G_MIRROR_EVENT_DONTWAIT); 1468 return; 1469 } 1470 1471 /* Send next synchronization request. */ 1472 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 1473 sync->ds_offset += bp->bio_length; 1474 1475 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1476 sync->ds_consumer->index++; 1477 1478 /* 1479 * Delay the request if it is colliding with a regular request. 1480 */ 1481 if (g_mirror_regular_collision(sc, bp)) 1482 g_mirror_sync_delay(sc, bp); 1483 else 1484 g_io_request(bp, sync->ds_consumer); 1485 1486 /* Requeue delayed requests if possible. */ 1487 g_mirror_regular_release(sc); 1488 1489 /* Find the smallest offset */ 1490 offset = sc->sc_mediasize; 1491 for (i = 0; i < g_mirror_syncreqs; i++) { 1492 bp = sync->ds_bios[i]; 1493 if (bp != NULL && bp->bio_offset < offset) 1494 offset = bp->bio_offset; 1495 } 1496 if (g_mirror_sync_period > 0 && 1497 time_uptime - sync->ds_update_ts > g_mirror_sync_period) { 1498 sync->ds_offset_done = offset; 1499 g_mirror_update_metadata(disk); 1500 sync->ds_update_ts = time_uptime; 1501 } 1502 return; 1503 } 1504 default: 1505 panic("Invalid I/O request %p", bp); 1506 } 1507 } 1508 1509 static void 1510 g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1511 { 1512 struct g_mirror_disk *disk; 1513 struct g_consumer *cp; 1514 struct bio *cbp; 1515 1516 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1517 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1518 break; 1519 } 1520 if (disk == NULL) { 1521 if (bp->bio_error == 0) 1522 bp->bio_error = ENXIO; 1523 g_io_deliver(bp, bp->bio_error); 1524 return; 1525 } 1526 cbp = g_clone_bio(bp); 1527 if (cbp == NULL) { 1528 if (bp->bio_error == 0) 1529 bp->bio_error = ENOMEM; 1530 g_io_deliver(bp, bp->bio_error); 1531 return; 1532 } 1533 /* 1534 * Fill in the component buf structure. 1535 */ 1536 cp = disk->d_consumer; 1537 cbp->bio_done = g_mirror_done; 1538 cbp->bio_to = cp->provider; 1539 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1540 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1541 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1542 cp->acw, cp->ace)); 1543 cp->index++; 1544 g_io_request(cbp, cp); 1545 } 1546 1547 static void 1548 g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1549 { 1550 struct g_mirror_disk *disk; 1551 struct g_consumer *cp; 1552 struct bio *cbp; 1553 1554 disk = g_mirror_get_disk(sc); 1555 if (disk == NULL) { 1556 if (bp->bio_error == 0) 1557 bp->bio_error = ENXIO; 1558 g_io_deliver(bp, bp->bio_error); 1559 return; 1560 } 1561 cbp = g_clone_bio(bp); 1562 if (cbp == NULL) { 1563 if (bp->bio_error == 0) 1564 bp->bio_error = ENOMEM; 1565 g_io_deliver(bp, bp->bio_error); 1566 return; 1567 } 1568 /* 1569 * Fill in the component buf structure. 1570 */ 1571 cp = disk->d_consumer; 1572 cbp->bio_done = g_mirror_done; 1573 cbp->bio_to = cp->provider; 1574 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1575 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1576 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1577 cp->acw, cp->ace)); 1578 cp->index++; 1579 g_io_request(cbp, cp); 1580 } 1581 1582 #define TRACK_SIZE (1 * 1024 * 1024) 1583 #define LOAD_SCALE 256 1584 #define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1585 1586 static void 1587 g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1588 { 1589 struct g_mirror_disk *disk, *dp; 1590 struct g_consumer *cp; 1591 struct bio *cbp; 1592 int prio, best; 1593 1594 /* Find a disk with the smallest load. */ 1595 disk = NULL; 1596 best = INT_MAX; 1597 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1598 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1599 continue; 1600 prio = dp->load; 1601 /* If disk head is precisely in position - highly prefer it. */ 1602 if (dp->d_last_offset == bp->bio_offset) 1603 prio -= 2 * LOAD_SCALE; 1604 else 1605 /* If disk head is close to position - prefer it. */ 1606 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1607 prio -= 1 * LOAD_SCALE; 1608 if (prio <= best) { 1609 disk = dp; 1610 best = prio; 1611 } 1612 } 1613 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1614 cbp = g_clone_bio(bp); 1615 if (cbp == NULL) { 1616 if (bp->bio_error == 0) 1617 bp->bio_error = ENOMEM; 1618 g_io_deliver(bp, bp->bio_error); 1619 return; 1620 } 1621 /* 1622 * Fill in the component buf structure. 1623 */ 1624 cp = disk->d_consumer; 1625 cbp->bio_done = g_mirror_done; 1626 cbp->bio_to = cp->provider; 1627 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1628 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1629 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1630 cp->acw, cp->ace)); 1631 cp->index++; 1632 /* Remember last head position */ 1633 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1634 /* Update loads. */ 1635 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1636 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1637 dp->load * 7) / 8; 1638 } 1639 g_io_request(cbp, cp); 1640 } 1641 1642 static void 1643 g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1644 { 1645 struct bio_queue queue; 1646 struct g_mirror_disk *disk; 1647 struct g_consumer *cp __diagused; 1648 struct bio *cbp; 1649 off_t left, mod, offset, slice; 1650 u_char *data; 1651 u_int ndisks; 1652 1653 if (bp->bio_length <= sc->sc_slice) { 1654 g_mirror_request_round_robin(sc, bp); 1655 return; 1656 } 1657 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1658 slice = bp->bio_length / ndisks; 1659 mod = slice % sc->sc_provider->sectorsize; 1660 if (mod != 0) 1661 slice += sc->sc_provider->sectorsize - mod; 1662 /* 1663 * Allocate all bios before sending any request, so we can 1664 * return ENOMEM in nice and clean way. 1665 */ 1666 left = bp->bio_length; 1667 offset = bp->bio_offset; 1668 data = bp->bio_data; 1669 TAILQ_INIT(&queue); 1670 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1671 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1672 continue; 1673 cbp = g_clone_bio(bp); 1674 if (cbp == NULL) { 1675 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1676 TAILQ_REMOVE(&queue, cbp, bio_queue); 1677 g_destroy_bio(cbp); 1678 } 1679 if (bp->bio_error == 0) 1680 bp->bio_error = ENOMEM; 1681 g_io_deliver(bp, bp->bio_error); 1682 return; 1683 } 1684 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1685 cbp->bio_done = g_mirror_done; 1686 cbp->bio_caller1 = disk; 1687 cbp->bio_to = disk->d_consumer->provider; 1688 cbp->bio_offset = offset; 1689 cbp->bio_data = data; 1690 cbp->bio_length = MIN(left, slice); 1691 left -= cbp->bio_length; 1692 if (left == 0) 1693 break; 1694 offset += cbp->bio_length; 1695 data += cbp->bio_length; 1696 } 1697 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1698 TAILQ_REMOVE(&queue, cbp, bio_queue); 1699 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1700 disk = cbp->bio_caller1; 1701 cbp->bio_caller1 = NULL; 1702 cp = disk->d_consumer; 1703 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1704 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1705 cp->acr, cp->acw, cp->ace)); 1706 disk->d_consumer->index++; 1707 g_io_request(cbp, disk->d_consumer); 1708 } 1709 } 1710 1711 static void 1712 g_mirror_register_request(struct g_mirror_softc *sc, struct bio *bp) 1713 { 1714 struct bio_queue queue; 1715 struct bio *cbp; 1716 struct g_consumer *cp; 1717 struct g_mirror_disk *disk; 1718 1719 sx_assert(&sc->sc_lock, SA_XLOCKED); 1720 1721 /* 1722 * To avoid ordering issues, if a write is deferred because of a 1723 * collision with a sync request, all I/O is deferred until that 1724 * write is initiated. 1725 */ 1726 if (bp->bio_from->geom != sc->sc_sync.ds_geom && 1727 !TAILQ_EMPTY(&sc->sc_regular_delayed)) { 1728 g_mirror_regular_delay(sc, bp); 1729 return; 1730 } 1731 1732 switch (bp->bio_cmd) { 1733 case BIO_READ: 1734 switch (sc->sc_balance) { 1735 case G_MIRROR_BALANCE_LOAD: 1736 g_mirror_request_load(sc, bp); 1737 break; 1738 case G_MIRROR_BALANCE_PREFER: 1739 g_mirror_request_prefer(sc, bp); 1740 break; 1741 case G_MIRROR_BALANCE_ROUND_ROBIN: 1742 g_mirror_request_round_robin(sc, bp); 1743 break; 1744 case G_MIRROR_BALANCE_SPLIT: 1745 g_mirror_request_split(sc, bp); 1746 break; 1747 } 1748 return; 1749 case BIO_WRITE: 1750 case BIO_DELETE: 1751 /* 1752 * Delay the request if it is colliding with a synchronization 1753 * request. 1754 */ 1755 if (g_mirror_sync_collision(sc, bp)) { 1756 g_mirror_regular_delay(sc, bp); 1757 return; 1758 } 1759 1760 if (sc->sc_idle) 1761 g_mirror_unidle(sc); 1762 else 1763 sc->sc_last_write = time_uptime; 1764 1765 /* 1766 * Bump syncid on first write. 1767 */ 1768 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1769 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1770 g_mirror_bump_syncid(sc); 1771 } 1772 1773 /* 1774 * Allocate all bios before sending any request, so we can 1775 * return ENOMEM in nice and clean way. 1776 */ 1777 TAILQ_INIT(&queue); 1778 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1779 switch (disk->d_state) { 1780 case G_MIRROR_DISK_STATE_ACTIVE: 1781 break; 1782 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1783 if (bp->bio_offset >= disk->d_sync.ds_offset) 1784 continue; 1785 break; 1786 default: 1787 continue; 1788 } 1789 if (bp->bio_cmd == BIO_DELETE && 1790 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1791 continue; 1792 cbp = g_clone_bio(bp); 1793 if (cbp == NULL) { 1794 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1795 TAILQ_REMOVE(&queue, cbp, bio_queue); 1796 g_destroy_bio(cbp); 1797 } 1798 if (bp->bio_error == 0) 1799 bp->bio_error = ENOMEM; 1800 g_io_deliver(bp, bp->bio_error); 1801 return; 1802 } 1803 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1804 cbp->bio_done = g_mirror_done; 1805 cp = disk->d_consumer; 1806 cbp->bio_caller1 = cp; 1807 cbp->bio_to = cp->provider; 1808 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1809 ("Consumer %s not opened (r%dw%de%d).", 1810 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1811 } 1812 if (TAILQ_EMPTY(&queue)) { 1813 KASSERT(bp->bio_cmd == BIO_DELETE, 1814 ("No consumers for regular request %p", bp)); 1815 g_io_deliver(bp, EOPNOTSUPP); 1816 return; 1817 } 1818 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1819 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1820 TAILQ_REMOVE(&queue, cbp, bio_queue); 1821 cp = cbp->bio_caller1; 1822 cbp->bio_caller1 = NULL; 1823 cp->index++; 1824 sc->sc_writes++; 1825 g_io_request(cbp, cp); 1826 } 1827 /* 1828 * Put request onto inflight queue, so we can check if new 1829 * synchronization requests don't collide with it. 1830 */ 1831 TAILQ_INSERT_TAIL(&sc->sc_inflight, bp, bio_queue); 1832 return; 1833 case BIO_SPEEDUP: 1834 case BIO_FLUSH: 1835 TAILQ_INIT(&queue); 1836 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1837 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1838 continue; 1839 cbp = g_clone_bio(bp); 1840 if (cbp == NULL) { 1841 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1842 TAILQ_REMOVE(&queue, cbp, bio_queue); 1843 g_destroy_bio(cbp); 1844 } 1845 if (bp->bio_error == 0) 1846 bp->bio_error = ENOMEM; 1847 g_io_deliver(bp, bp->bio_error); 1848 return; 1849 } 1850 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue); 1851 cbp->bio_done = g_mirror_done; 1852 cbp->bio_caller1 = disk; 1853 cbp->bio_to = disk->d_consumer->provider; 1854 } 1855 KASSERT(!TAILQ_EMPTY(&queue), 1856 ("No consumers for regular request %p", bp)); 1857 while ((cbp = TAILQ_FIRST(&queue)) != NULL) { 1858 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1859 TAILQ_REMOVE(&queue, cbp, bio_queue); 1860 disk = cbp->bio_caller1; 1861 cbp->bio_caller1 = NULL; 1862 cp = disk->d_consumer; 1863 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1864 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1865 cp->acr, cp->acw, cp->ace)); 1866 cp->index++; 1867 g_io_request(cbp, cp); 1868 } 1869 break; 1870 default: 1871 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1872 bp->bio_cmd, sc->sc_name)); 1873 break; 1874 } 1875 } 1876 1877 static int 1878 g_mirror_can_destroy(struct g_mirror_softc *sc) 1879 { 1880 struct g_geom *gp; 1881 struct g_consumer *cp; 1882 1883 g_topology_assert(); 1884 gp = sc->sc_geom; 1885 if (gp->softc == NULL) 1886 return (1); 1887 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1888 return (0); 1889 LIST_FOREACH(cp, &gp->consumer, consumer) { 1890 if (g_mirror_is_busy(sc, cp)) 1891 return (0); 1892 } 1893 gp = sc->sc_sync.ds_geom; 1894 LIST_FOREACH(cp, &gp->consumer, consumer) { 1895 if (g_mirror_is_busy(sc, cp)) 1896 return (0); 1897 } 1898 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1899 sc->sc_name); 1900 return (1); 1901 } 1902 1903 static int 1904 g_mirror_try_destroy(struct g_mirror_softc *sc) 1905 { 1906 1907 if (sc->sc_rootmount != NULL) { 1908 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1909 sc->sc_rootmount); 1910 root_mount_rel(sc->sc_rootmount); 1911 sc->sc_rootmount = NULL; 1912 } 1913 g_topology_lock(); 1914 if (!g_mirror_can_destroy(sc)) { 1915 g_topology_unlock(); 1916 return (0); 1917 } 1918 sc->sc_geom->softc = NULL; 1919 sc->sc_sync.ds_geom->softc = NULL; 1920 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DRAIN) != 0) { 1921 g_topology_unlock(); 1922 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1923 &sc->sc_worker); 1924 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1925 sx_xunlock(&sc->sc_lock); 1926 wakeup(&sc->sc_worker); 1927 sc->sc_worker = NULL; 1928 } else { 1929 g_topology_unlock(); 1930 g_mirror_destroy_device(sc); 1931 } 1932 return (1); 1933 } 1934 1935 /* 1936 * Worker thread. 1937 */ 1938 static void 1939 g_mirror_worker(void *arg) 1940 { 1941 struct g_mirror_softc *sc; 1942 struct g_mirror_event *ep; 1943 struct bio *bp; 1944 int timeout; 1945 1946 sc = arg; 1947 thread_lock(curthread); 1948 sched_prio(curthread, PRIBIO); 1949 thread_unlock(curthread); 1950 1951 sx_xlock(&sc->sc_lock); 1952 for (;;) { 1953 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1954 /* 1955 * First take a look at events. 1956 * This is important to handle events before any I/O requests. 1957 */ 1958 ep = g_mirror_event_first(sc); 1959 if (ep != NULL) { 1960 g_mirror_event_remove(sc, ep); 1961 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1962 /* Update only device status. */ 1963 G_MIRROR_DEBUG(3, 1964 "Running event for device %s.", 1965 sc->sc_name); 1966 ep->e_error = 0; 1967 g_mirror_update_device(sc, true); 1968 } else { 1969 /* Update disk status. */ 1970 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1971 g_mirror_get_diskname(ep->e_disk)); 1972 ep->e_error = g_mirror_update_disk(ep->e_disk, 1973 ep->e_state); 1974 if (ep->e_error == 0) 1975 g_mirror_update_device(sc, false); 1976 } 1977 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1978 KASSERT(ep->e_error == 0, 1979 ("Error cannot be handled.")); 1980 g_mirror_event_free(ep); 1981 } else { 1982 ep->e_flags |= G_MIRROR_EVENT_DONE; 1983 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1984 ep); 1985 mtx_lock(&sc->sc_events_mtx); 1986 wakeup(ep); 1987 mtx_unlock(&sc->sc_events_mtx); 1988 } 1989 if ((sc->sc_flags & 1990 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1991 if (g_mirror_try_destroy(sc)) { 1992 curthread->td_pflags &= ~TDP_GEOM; 1993 G_MIRROR_DEBUG(1, "Thread exiting."); 1994 kproc_exit(0); 1995 } 1996 } 1997 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1998 continue; 1999 } 2000 2001 /* 2002 * Check if we can mark array as CLEAN and if we can't take 2003 * how much seconds should we wait. 2004 */ 2005 timeout = g_mirror_idle(sc, -1); 2006 2007 /* 2008 * Handle I/O requests. 2009 */ 2010 mtx_lock(&sc->sc_queue_mtx); 2011 bp = TAILQ_FIRST(&sc->sc_queue); 2012 if (bp != NULL) 2013 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 2014 else { 2015 if ((sc->sc_flags & 2016 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 2017 mtx_unlock(&sc->sc_queue_mtx); 2018 if (g_mirror_try_destroy(sc)) { 2019 curthread->td_pflags &= ~TDP_GEOM; 2020 G_MIRROR_DEBUG(1, "Thread exiting."); 2021 kproc_exit(0); 2022 } 2023 mtx_lock(&sc->sc_queue_mtx); 2024 if (!TAILQ_EMPTY(&sc->sc_queue)) { 2025 mtx_unlock(&sc->sc_queue_mtx); 2026 continue; 2027 } 2028 } 2029 if (g_mirror_event_first(sc) != NULL) { 2030 mtx_unlock(&sc->sc_queue_mtx); 2031 continue; 2032 } 2033 sx_xunlock(&sc->sc_lock); 2034 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 2035 timeout * hz); 2036 sx_xlock(&sc->sc_lock); 2037 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 2038 continue; 2039 } 2040 mtx_unlock(&sc->sc_queue_mtx); 2041 2042 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 2043 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 2044 /* 2045 * Handle completion of the first half (the read) of a 2046 * block synchronization operation. 2047 */ 2048 g_mirror_sync_request(sc, bp); 2049 } else if (bp->bio_to != sc->sc_provider) { 2050 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 2051 /* 2052 * Handle completion of a regular I/O request. 2053 */ 2054 g_mirror_regular_request(sc, bp); 2055 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2056 /* 2057 * Handle completion of the second half (the 2058 * write) of a block synchronization operation. 2059 */ 2060 g_mirror_sync_request(sc, bp); 2061 else { 2062 KASSERT(0, 2063 ("Invalid request cflags=0x%hx to=%s.", 2064 bp->bio_cflags, bp->bio_to->name)); 2065 } 2066 } else { 2067 /* 2068 * Initiate an I/O request. 2069 */ 2070 g_mirror_register_request(sc, bp); 2071 } 2072 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 2073 } 2074 } 2075 2076 static void 2077 g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 2078 { 2079 2080 sx_assert(&sc->sc_lock, SX_LOCKED); 2081 2082 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 2083 return; 2084 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2085 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as dirty.", 2086 g_mirror_get_diskname(disk), sc->sc_name); 2087 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2088 } else if (sc->sc_idle && 2089 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2090 G_MIRROR_DEBUG(2, "Disk %s (device %s) marked as clean.", 2091 g_mirror_get_diskname(disk), sc->sc_name); 2092 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2093 } 2094 } 2095 2096 static void 2097 g_mirror_sync_reinit(const struct g_mirror_disk *disk, struct bio *bp, 2098 off_t offset) 2099 { 2100 void *data; 2101 int idx; 2102 2103 data = bp->bio_data; 2104 idx = (int)(uintptr_t)bp->bio_caller1; 2105 g_reset_bio(bp); 2106 2107 bp->bio_cmd = BIO_READ; 2108 bp->bio_data = data; 2109 bp->bio_done = g_mirror_sync_done; 2110 bp->bio_from = disk->d_sync.ds_consumer; 2111 bp->bio_to = disk->d_softc->sc_provider; 2112 bp->bio_caller1 = (void *)(uintptr_t)idx; 2113 bp->bio_offset = offset; 2114 bp->bio_length = MIN(maxphys, 2115 disk->d_softc->sc_mediasize - bp->bio_offset); 2116 } 2117 2118 static void 2119 g_mirror_sync_start(struct g_mirror_disk *disk) 2120 { 2121 struct g_mirror_softc *sc; 2122 struct g_mirror_disk_sync *sync; 2123 struct g_consumer *cp; 2124 struct bio *bp; 2125 int error __diagused, i; 2126 2127 g_topology_assert_not(); 2128 sc = disk->d_softc; 2129 sync = &disk->d_sync; 2130 sx_assert(&sc->sc_lock, SX_LOCKED); 2131 2132 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2133 ("Disk %s is not marked for synchronization.", 2134 g_mirror_get_diskname(disk))); 2135 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2136 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 2137 sc->sc_state)); 2138 2139 sx_xunlock(&sc->sc_lock); 2140 g_topology_lock(); 2141 cp = g_new_consumer(sc->sc_sync.ds_geom); 2142 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 2143 error = g_attach(cp, sc->sc_provider); 2144 KASSERT(error == 0, 2145 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 2146 error = g_access(cp, 1, 0, 0); 2147 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 2148 g_topology_unlock(); 2149 sx_xlock(&sc->sc_lock); 2150 2151 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 2152 g_mirror_get_diskname(disk)); 2153 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 2154 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 2155 KASSERT(sync->ds_consumer == NULL, 2156 ("Sync consumer already exists (device=%s, disk=%s).", 2157 sc->sc_name, g_mirror_get_diskname(disk))); 2158 2159 sync->ds_consumer = cp; 2160 sync->ds_consumer->private = disk; 2161 sync->ds_consumer->index = 0; 2162 2163 /* 2164 * Allocate memory for synchronization bios and initialize them. 2165 */ 2166 sync->ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 2167 M_MIRROR, M_WAITOK); 2168 for (i = 0; i < g_mirror_syncreqs; i++) { 2169 bp = g_alloc_bio(); 2170 sync->ds_bios[i] = bp; 2171 2172 bp->bio_data = malloc(maxphys, M_MIRROR, M_WAITOK); 2173 bp->bio_caller1 = (void *)(uintptr_t)i; 2174 g_mirror_sync_reinit(disk, bp, sync->ds_offset); 2175 sync->ds_offset += bp->bio_length; 2176 } 2177 2178 /* Increase the number of disks in SYNCHRONIZING state. */ 2179 sc->sc_sync.ds_ndisks++; 2180 /* Set the number of in-flight synchronization requests. */ 2181 sync->ds_inflight = g_mirror_syncreqs; 2182 2183 /* 2184 * Fire off first synchronization requests. 2185 */ 2186 for (i = 0; i < g_mirror_syncreqs; i++) { 2187 bp = sync->ds_bios[i]; 2188 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 2189 sync->ds_consumer->index++; 2190 /* 2191 * Delay the request if it is colliding with a regular request. 2192 */ 2193 if (g_mirror_regular_collision(sc, bp)) 2194 g_mirror_sync_delay(sc, bp); 2195 else 2196 g_io_request(bp, sync->ds_consumer); 2197 } 2198 } 2199 2200 /* 2201 * Stop synchronization process. 2202 * type: 0 - synchronization finished 2203 * 1 - synchronization stopped 2204 */ 2205 static void 2206 g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2207 { 2208 struct g_mirror_softc *sc; 2209 struct g_consumer *cp; 2210 2211 g_topology_assert_not(); 2212 sc = disk->d_softc; 2213 sx_assert(&sc->sc_lock, SX_LOCKED); 2214 2215 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2216 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2217 g_mirror_disk_state2str(disk->d_state))); 2218 if (disk->d_sync.ds_consumer == NULL) 2219 return; 2220 2221 if (type == 0) { 2222 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2223 sc->sc_name, g_mirror_get_diskname(disk)); 2224 } else /* if (type == 1) */ { 2225 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2226 sc->sc_name, g_mirror_get_diskname(disk)); 2227 } 2228 g_mirror_regular_release(sc); 2229 free(disk->d_sync.ds_bios, M_MIRROR); 2230 disk->d_sync.ds_bios = NULL; 2231 cp = disk->d_sync.ds_consumer; 2232 disk->d_sync.ds_consumer = NULL; 2233 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2234 sc->sc_sync.ds_ndisks--; 2235 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2236 g_topology_lock(); 2237 g_mirror_kill_consumer(sc, cp); 2238 g_topology_unlock(); 2239 sx_xlock(&sc->sc_lock); 2240 } 2241 2242 static void 2243 g_mirror_launch_provider(struct g_mirror_softc *sc) 2244 { 2245 struct g_mirror_disk *disk; 2246 struct g_provider *pp, *dp; 2247 2248 sx_assert(&sc->sc_lock, SX_LOCKED); 2249 2250 g_topology_lock(); 2251 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2252 pp->flags |= G_PF_DIRECT_RECEIVE; 2253 pp->mediasize = sc->sc_mediasize; 2254 pp->sectorsize = sc->sc_sectorsize; 2255 pp->stripesize = 0; 2256 pp->stripeoffset = 0; 2257 2258 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2259 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2260 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2261 2262 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2263 if (disk->d_consumer && disk->d_consumer->provider) { 2264 dp = disk->d_consumer->provider; 2265 if (dp->stripesize > pp->stripesize) { 2266 pp->stripesize = dp->stripesize; 2267 pp->stripeoffset = dp->stripeoffset; 2268 } 2269 /* A provider underneath us doesn't support unmapped */ 2270 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2271 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2272 "because of %s.", dp->name); 2273 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2274 } 2275 } 2276 } 2277 pp->private = sc; 2278 sc->sc_refcnt++; 2279 sc->sc_provider = pp; 2280 g_error_provider(pp, 0); 2281 g_topology_unlock(); 2282 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2283 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2284 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2285 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2286 g_mirror_sync_start(disk); 2287 } 2288 } 2289 2290 static void 2291 g_mirror_destroy_provider(struct g_mirror_softc *sc) 2292 { 2293 struct g_mirror_disk *disk; 2294 struct bio *bp; 2295 2296 g_topology_assert_not(); 2297 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2298 sc->sc_name)); 2299 2300 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2301 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2302 g_mirror_sync_stop(disk, 1); 2303 } 2304 2305 g_topology_lock(); 2306 g_error_provider(sc->sc_provider, ENXIO); 2307 mtx_lock(&sc->sc_queue_mtx); 2308 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 2309 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 2310 /* 2311 * Abort any pending I/O that wasn't generated by us. 2312 * Synchronization requests and requests destined for individual 2313 * mirror components can be destroyed immediately. 2314 */ 2315 if (bp->bio_to == sc->sc_provider && 2316 bp->bio_from->geom != sc->sc_sync.ds_geom) { 2317 g_io_deliver(bp, ENXIO); 2318 } else { 2319 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 2320 free(bp->bio_data, M_MIRROR); 2321 g_destroy_bio(bp); 2322 } 2323 } 2324 mtx_unlock(&sc->sc_queue_mtx); 2325 g_wither_provider(sc->sc_provider, ENXIO); 2326 sc->sc_provider = NULL; 2327 G_MIRROR_DEBUG(0, "Device %s: provider destroyed.", sc->sc_name); 2328 g_topology_unlock(); 2329 } 2330 2331 static void 2332 g_mirror_go(void *arg) 2333 { 2334 struct g_mirror_softc *sc; 2335 struct g_mirror_event *ep; 2336 2337 sc = arg; 2338 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2339 ep = sc->sc_timeout_event; 2340 sc->sc_timeout_event = NULL; 2341 g_mirror_event_dispatch(ep, sc, 0, 2342 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2343 } 2344 2345 static void 2346 g_mirror_timeout_drain(struct g_mirror_softc *sc) 2347 { 2348 sx_assert(&sc->sc_lock, SX_XLOCKED); 2349 2350 callout_drain(&sc->sc_callout); 2351 g_mirror_event_free(sc->sc_timeout_event); 2352 sc->sc_timeout_event = NULL; 2353 } 2354 2355 static u_int 2356 g_mirror_determine_state(struct g_mirror_disk *disk) 2357 { 2358 struct g_mirror_softc *sc; 2359 u_int state; 2360 2361 sc = disk->d_softc; 2362 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2363 if ((disk->d_flags & 2364 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0 && 2365 (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 || 2366 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0)) { 2367 /* Disk does not need synchronization. */ 2368 state = G_MIRROR_DISK_STATE_ACTIVE; 2369 } else { 2370 if ((sc->sc_flags & 2371 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2372 (disk->d_flags & 2373 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2374 /* 2375 * We can start synchronization from 2376 * the stored offset. 2377 */ 2378 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2379 } else { 2380 state = G_MIRROR_DISK_STATE_STALE; 2381 } 2382 } 2383 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2384 /* 2385 * Reset all synchronization data for this disk, 2386 * because if it even was synchronized, it was 2387 * synchronized to disks with different syncid. 2388 */ 2389 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2390 disk->d_sync.ds_offset = 0; 2391 disk->d_sync.ds_offset_done = 0; 2392 disk->d_sync.ds_syncid = sc->sc_syncid; 2393 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2394 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2395 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2396 } else { 2397 state = G_MIRROR_DISK_STATE_STALE; 2398 } 2399 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2400 /* 2401 * Not good, NOT GOOD! 2402 * It means that mirror was started on stale disks 2403 * and more fresh disk just arrive. 2404 * If there were writes, mirror is broken, sorry. 2405 * I think the best choice here is don't touch 2406 * this disk and inform the user loudly. 2407 */ 2408 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2409 "disk (%s) arrives!! It will not be connected to the " 2410 "running device.", sc->sc_name, 2411 g_mirror_get_diskname(disk)); 2412 g_mirror_destroy_disk(disk); 2413 state = G_MIRROR_DISK_STATE_NONE; 2414 /* Return immediately, because disk was destroyed. */ 2415 return (state); 2416 } 2417 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2418 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2419 return (state); 2420 } 2421 2422 /* 2423 * Update device state. 2424 */ 2425 static void 2426 g_mirror_update_device(struct g_mirror_softc *sc, bool force) 2427 { 2428 struct g_mirror_disk *disk; 2429 u_int state; 2430 2431 sx_assert(&sc->sc_lock, SX_XLOCKED); 2432 2433 switch (sc->sc_state) { 2434 case G_MIRROR_DEVICE_STATE_STARTING: 2435 { 2436 struct g_mirror_disk *pdisk, *tdisk; 2437 const char *mismatch; 2438 uintmax_t found, newest; 2439 u_int dirty, ndisks; 2440 2441 /* Pre-flight checks */ 2442 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2443 /* 2444 * Confirm we already detected the newest genid. 2445 */ 2446 KASSERT(sc->sc_genid >= disk->d_genid, 2447 ("%s: found newer genid %u (sc:%p had %u).", __func__, 2448 disk->d_genid, sc, sc->sc_genid)); 2449 2450 /* Kick out any previously tasted stale components. */ 2451 if (disk->d_genid < sc->sc_genid) { 2452 G_MIRROR_DEBUG(0, "Stale 'genid' field on %s " 2453 "(device %s) (component=%u latest=%u), skipping.", 2454 g_mirror_get_diskname(disk), sc->sc_name, 2455 disk->d_genid, sc->sc_genid); 2456 g_mirror_destroy_disk(disk); 2457 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2458 continue; 2459 } 2460 2461 /* 2462 * Confirm we already detected the newest syncid. 2463 */ 2464 KASSERT(sc->sc_syncid >= disk->d_sync.ds_syncid, 2465 ("%s: found newer syncid %u (sc:%p had %u).", 2466 __func__, disk->d_sync.ds_syncid, sc, 2467 sc->sc_syncid)); 2468 2469 #define DETECT_MISMATCH(field, name) \ 2470 if (mismatch == NULL && \ 2471 disk->d_init_ ## field != sc->sc_ ## field) { \ 2472 mismatch = name; \ 2473 found = (intmax_t)disk->d_init_ ## field; \ 2474 newest = (intmax_t)sc->sc_ ## field; \ 2475 } 2476 mismatch = NULL; 2477 DETECT_MISMATCH(ndisks, "md_all"); 2478 DETECT_MISMATCH(balance, "md_balance"); 2479 DETECT_MISMATCH(slice, "md_slice"); 2480 DETECT_MISMATCH(mediasize, "md_mediasize"); 2481 #undef DETECT_MISMATCH 2482 if (mismatch != NULL) { 2483 G_MIRROR_DEBUG(0, "Found a mismatching '%s' " 2484 "field on %s (device %s) (found=%ju " 2485 "newest=%ju).", mismatch, 2486 g_mirror_get_diskname(disk), sc->sc_name, 2487 found, newest); 2488 g_mirror_destroy_disk(disk); 2489 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2490 continue; 2491 } 2492 } 2493 2494 KASSERT(sc->sc_provider == NULL, 2495 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2496 /* 2497 * Are we ready? If the timeout (force is true) has expired, and 2498 * any disks are present, then yes. If we're permitted to launch 2499 * before the timeout has expired and the expected number of 2500 * current-generation mirror disks have been tasted, then yes. 2501 */ 2502 ndisks = g_mirror_ndisks(sc, -1); 2503 if ((force && ndisks > 0) || 2504 (g_launch_mirror_before_timeout && ndisks == sc->sc_ndisks)) { 2505 ; 2506 } else if (ndisks == 0) { 2507 /* 2508 * Disks went down in starting phase, so destroy 2509 * device. 2510 */ 2511 g_mirror_timeout_drain(sc); 2512 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2513 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2514 sc->sc_rootmount); 2515 root_mount_rel(sc->sc_rootmount); 2516 sc->sc_rootmount = NULL; 2517 return; 2518 } else { 2519 return; 2520 } 2521 2522 /* 2523 * Activate all disks with the biggest syncid. 2524 */ 2525 if (force) { 2526 /* 2527 * If 'force' is true, we have been called due to 2528 * timeout, so don't bother canceling timeout. 2529 */ 2530 ndisks = 0; 2531 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2532 if ((disk->d_flags & 2533 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2534 ndisks++; 2535 } 2536 } 2537 if (ndisks == 0) { 2538 /* No valid disks found, destroy device. */ 2539 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2540 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2541 __LINE__, sc->sc_rootmount); 2542 root_mount_rel(sc->sc_rootmount); 2543 sc->sc_rootmount = NULL; 2544 return; 2545 } 2546 } else { 2547 /* Cancel timeout. */ 2548 g_mirror_timeout_drain(sc); 2549 } 2550 2551 /* 2552 * Here we need to look for dirty disks and if all disks 2553 * with the biggest syncid are dirty, we have to choose 2554 * one with the biggest priority and rebuild the rest. 2555 */ 2556 /* 2557 * Find the number of dirty disks with the biggest syncid. 2558 * Find the number of disks with the biggest syncid. 2559 * While here, find a disk with the biggest priority. 2560 */ 2561 dirty = ndisks = 0; 2562 pdisk = NULL; 2563 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2564 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2565 continue; 2566 if ((disk->d_flags & 2567 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2568 continue; 2569 } 2570 ndisks++; 2571 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2572 dirty++; 2573 if (pdisk == NULL || 2574 pdisk->d_priority < disk->d_priority) { 2575 pdisk = disk; 2576 } 2577 } 2578 } 2579 if (dirty == 0) { 2580 /* No dirty disks at all, great. */ 2581 } else if (dirty == ndisks) { 2582 /* 2583 * Force synchronization for all dirty disks except one 2584 * with the biggest priority. 2585 */ 2586 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2587 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2588 "master disk for synchronization.", 2589 g_mirror_get_diskname(pdisk), sc->sc_name); 2590 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2591 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2592 continue; 2593 if ((disk->d_flags & 2594 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2595 continue; 2596 } 2597 KASSERT((disk->d_flags & 2598 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2599 ("Disk %s isn't marked as dirty.", 2600 g_mirror_get_diskname(disk))); 2601 /* Skip the disk with the biggest priority. */ 2602 if (disk == pdisk) 2603 continue; 2604 disk->d_sync.ds_syncid = 0; 2605 } 2606 } else if (dirty < ndisks) { 2607 /* 2608 * Force synchronization for all dirty disks. 2609 * We have some non-dirty disks. 2610 */ 2611 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2612 if (disk->d_sync.ds_syncid != sc->sc_syncid) 2613 continue; 2614 if ((disk->d_flags & 2615 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2616 continue; 2617 } 2618 if ((disk->d_flags & 2619 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2620 continue; 2621 } 2622 disk->d_sync.ds_syncid = 0; 2623 } 2624 } 2625 2626 /* Reset hint. */ 2627 sc->sc_hint = NULL; 2628 if (force) { 2629 /* Remember to bump syncid on first write. */ 2630 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2631 } 2632 state = G_MIRROR_DEVICE_STATE_RUNNING; 2633 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2634 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2635 g_mirror_device_state2str(state)); 2636 sc->sc_state = state; 2637 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2638 state = g_mirror_determine_state(disk); 2639 g_mirror_event_send(disk, state, 2640 G_MIRROR_EVENT_DONTWAIT); 2641 if (state == G_MIRROR_DISK_STATE_STALE) 2642 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2643 } 2644 break; 2645 } 2646 case G_MIRROR_DEVICE_STATE_RUNNING: 2647 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2648 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2649 /* 2650 * No usable disks, so destroy the device. 2651 */ 2652 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2653 break; 2654 } else if (g_mirror_ndisks(sc, 2655 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2656 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2657 /* 2658 * We have active disks, launch provider if it doesn't 2659 * exist. 2660 */ 2661 if (sc->sc_provider == NULL) 2662 g_mirror_launch_provider(sc); 2663 if (sc->sc_rootmount != NULL) { 2664 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2665 __LINE__, sc->sc_rootmount); 2666 root_mount_rel(sc->sc_rootmount); 2667 sc->sc_rootmount = NULL; 2668 } 2669 } 2670 /* 2671 * Genid should be bumped immediately, so do it here. 2672 */ 2673 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2674 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2675 g_mirror_bump_genid(sc); 2676 } 2677 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID_NOW) != 0) { 2678 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID_NOW; 2679 g_mirror_bump_syncid(sc); 2680 } 2681 break; 2682 default: 2683 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2684 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2685 break; 2686 } 2687 } 2688 2689 /* 2690 * Update disk state and device state if needed. 2691 */ 2692 #define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2693 "Disk %s state changed from %s to %s (device %s).", \ 2694 g_mirror_get_diskname(disk), \ 2695 g_mirror_disk_state2str(disk->d_state), \ 2696 g_mirror_disk_state2str(state), sc->sc_name) 2697 static int 2698 g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2699 { 2700 struct g_mirror_softc *sc; 2701 2702 sc = disk->d_softc; 2703 sx_assert(&sc->sc_lock, SX_XLOCKED); 2704 2705 again: 2706 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2707 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2708 g_mirror_disk_state2str(state)); 2709 switch (state) { 2710 case G_MIRROR_DISK_STATE_NEW: 2711 /* 2712 * Possible scenarios: 2713 * 1. New disk arrive. 2714 */ 2715 /* Previous state should be NONE. */ 2716 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2717 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2718 g_mirror_disk_state2str(disk->d_state))); 2719 DISK_STATE_CHANGED(); 2720 2721 disk->d_state = state; 2722 g_topology_lock(); 2723 if (LIST_EMPTY(&sc->sc_disks)) 2724 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2725 else { 2726 struct g_mirror_disk *dp; 2727 2728 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2729 if (disk->d_priority >= dp->d_priority) { 2730 LIST_INSERT_BEFORE(dp, disk, d_next); 2731 dp = NULL; 2732 break; 2733 } 2734 if (LIST_NEXT(dp, d_next) == NULL) 2735 break; 2736 } 2737 if (dp != NULL) 2738 LIST_INSERT_AFTER(dp, disk, d_next); 2739 } 2740 g_topology_unlock(); 2741 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2742 sc->sc_name, g_mirror_get_diskname(disk)); 2743 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2744 break; 2745 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2746 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2747 g_mirror_device_state2str(sc->sc_state), 2748 g_mirror_get_diskname(disk), 2749 g_mirror_disk_state2str(disk->d_state))); 2750 state = g_mirror_determine_state(disk); 2751 if (state != G_MIRROR_DISK_STATE_NONE) 2752 goto again; 2753 break; 2754 case G_MIRROR_DISK_STATE_ACTIVE: 2755 /* 2756 * Possible scenarios: 2757 * 1. New disk does not need synchronization. 2758 * 2. Synchronization process finished successfully. 2759 */ 2760 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2761 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2762 g_mirror_device_state2str(sc->sc_state), 2763 g_mirror_get_diskname(disk), 2764 g_mirror_disk_state2str(disk->d_state))); 2765 /* Previous state should be NEW or SYNCHRONIZING. */ 2766 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2767 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2768 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2769 g_mirror_disk_state2str(disk->d_state))); 2770 DISK_STATE_CHANGED(); 2771 2772 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2773 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2774 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2775 g_mirror_sync_stop(disk, 0); 2776 } 2777 disk->d_state = state; 2778 disk->d_sync.ds_offset = 0; 2779 disk->d_sync.ds_offset_done = 0; 2780 g_mirror_update_idle(sc, disk); 2781 g_mirror_update_metadata(disk); 2782 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2783 sc->sc_name, g_mirror_get_diskname(disk)); 2784 break; 2785 case G_MIRROR_DISK_STATE_STALE: 2786 /* 2787 * Possible scenarios: 2788 * 1. Stale disk was connected. 2789 */ 2790 /* Previous state should be NEW. */ 2791 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2792 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2793 g_mirror_disk_state2str(disk->d_state))); 2794 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2795 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2796 g_mirror_device_state2str(sc->sc_state), 2797 g_mirror_get_diskname(disk), 2798 g_mirror_disk_state2str(disk->d_state))); 2799 /* 2800 * STALE state is only possible if device is marked 2801 * NOAUTOSYNC. 2802 */ 2803 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2804 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2805 g_mirror_device_state2str(sc->sc_state), 2806 g_mirror_get_diskname(disk), 2807 g_mirror_disk_state2str(disk->d_state))); 2808 DISK_STATE_CHANGED(); 2809 2810 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2811 disk->d_state = state; 2812 g_mirror_update_metadata(disk); 2813 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2814 sc->sc_name, g_mirror_get_diskname(disk)); 2815 break; 2816 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2817 /* 2818 * Possible scenarios: 2819 * 1. Disk which needs synchronization was connected. 2820 */ 2821 /* Previous state should be NEW. */ 2822 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2823 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2824 g_mirror_disk_state2str(disk->d_state))); 2825 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2826 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2827 g_mirror_device_state2str(sc->sc_state), 2828 g_mirror_get_diskname(disk), 2829 g_mirror_disk_state2str(disk->d_state))); 2830 DISK_STATE_CHANGED(); 2831 2832 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2833 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2834 disk->d_state = state; 2835 if (sc->sc_provider != NULL) { 2836 g_mirror_sync_start(disk); 2837 g_mirror_update_metadata(disk); 2838 } 2839 break; 2840 case G_MIRROR_DISK_STATE_DISCONNECTED: 2841 /* 2842 * Possible scenarios: 2843 * 1. Device wasn't running yet, but disk disappear. 2844 * 2. Disk was active and disapppear. 2845 * 3. Disk disappear during synchronization process. 2846 */ 2847 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2848 /* 2849 * Previous state should be ACTIVE, STALE or 2850 * SYNCHRONIZING. 2851 */ 2852 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2853 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2854 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2855 ("Wrong disk state (%s, %s).", 2856 g_mirror_get_diskname(disk), 2857 g_mirror_disk_state2str(disk->d_state))); 2858 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2859 /* Previous state should be NEW. */ 2860 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2861 ("Wrong disk state (%s, %s).", 2862 g_mirror_get_diskname(disk), 2863 g_mirror_disk_state2str(disk->d_state))); 2864 /* 2865 * Reset bumping syncid if disk disappeared in STARTING 2866 * state. 2867 */ 2868 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2869 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2870 #ifdef INVARIANTS 2871 } else { 2872 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2873 sc->sc_name, 2874 g_mirror_device_state2str(sc->sc_state), 2875 g_mirror_get_diskname(disk), 2876 g_mirror_disk_state2str(disk->d_state))); 2877 #endif 2878 } 2879 DISK_STATE_CHANGED(); 2880 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2881 sc->sc_name, g_mirror_get_diskname(disk)); 2882 2883 g_mirror_destroy_disk(disk); 2884 break; 2885 case G_MIRROR_DISK_STATE_DESTROY: 2886 { 2887 int error; 2888 2889 error = g_mirror_clear_metadata(disk); 2890 if (error != 0) { 2891 G_MIRROR_DEBUG(0, 2892 "Device %s: failed to clear metadata on %s: %d.", 2893 sc->sc_name, g_mirror_get_diskname(disk), error); 2894 break; 2895 } 2896 DISK_STATE_CHANGED(); 2897 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2898 sc->sc_name, g_mirror_get_diskname(disk)); 2899 2900 g_mirror_destroy_disk(disk); 2901 sc->sc_ndisks--; 2902 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2903 g_mirror_update_metadata(disk); 2904 } 2905 break; 2906 } 2907 default: 2908 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2909 break; 2910 } 2911 return (0); 2912 } 2913 #undef DISK_STATE_CHANGED 2914 2915 int 2916 g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2917 { 2918 struct g_provider *pp; 2919 u_char *buf; 2920 int error; 2921 2922 g_topology_assert(); 2923 2924 error = g_access(cp, 1, 0, 0); 2925 if (error != 0) 2926 return (error); 2927 pp = cp->provider; 2928 g_topology_unlock(); 2929 /* Metadata are stored on last sector. */ 2930 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2931 &error); 2932 g_topology_lock(); 2933 g_access(cp, -1, 0, 0); 2934 if (buf == NULL) { 2935 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2936 cp->provider->name, error); 2937 return (error); 2938 } 2939 2940 /* Decode metadata. */ 2941 error = mirror_metadata_decode(buf, md); 2942 g_free(buf); 2943 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2944 return (EINVAL); 2945 if (md->md_version > G_MIRROR_VERSION) { 2946 G_MIRROR_DEBUG(0, 2947 "Kernel module is too old to handle metadata from %s.", 2948 cp->provider->name); 2949 return (EINVAL); 2950 } 2951 if (error != 0) { 2952 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2953 cp->provider->name); 2954 return (error); 2955 } 2956 2957 return (0); 2958 } 2959 2960 static int 2961 g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2962 struct g_mirror_metadata *md) 2963 { 2964 2965 G_MIRROR_DEBUG(2, "%s: md_did 0x%u disk %s device %s md_all 0x%x " 2966 "sc_ndisks 0x%x md_slice 0x%x sc_slice 0x%x md_balance 0x%x " 2967 "sc_balance 0x%x sc_mediasize 0x%jx pp_mediasize 0x%jx " 2968 "md_sectorsize 0x%x sc_sectorsize 0x%x md_mflags 0x%jx " 2969 "md_dflags 0x%jx md_syncid 0x%x md_genid 0x%x md_priority 0x%x " 2970 "sc_state 0x%x.", 2971 __func__, md->md_did, pp->name, sc->sc_name, md->md_all, 2972 sc->sc_ndisks, md->md_slice, sc->sc_slice, md->md_balance, 2973 sc->sc_balance, (uintmax_t)sc->sc_mediasize, 2974 (uintmax_t)pp->mediasize, md->md_sectorsize, sc->sc_sectorsize, 2975 (uintmax_t)md->md_mflags, (uintmax_t)md->md_dflags, md->md_syncid, 2976 md->md_genid, md->md_priority, sc->sc_state); 2977 2978 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2979 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2980 pp->name, md->md_did); 2981 return (EEXIST); 2982 } 2983 if (sc->sc_mediasize > pp->mediasize) { 2984 G_MIRROR_DEBUG(1, 2985 "Invalid size of disk %s (device %s), skipping.", pp->name, 2986 sc->sc_name); 2987 return (EINVAL); 2988 } 2989 if (md->md_sectorsize != sc->sc_sectorsize) { 2990 G_MIRROR_DEBUG(1, 2991 "Invalid '%s' field on disk %s (device %s), skipping.", 2992 "md_sectorsize", pp->name, sc->sc_name); 2993 return (EINVAL); 2994 } 2995 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2996 G_MIRROR_DEBUG(1, 2997 "Invalid sector size of disk %s (device %s), skipping.", 2998 pp->name, sc->sc_name); 2999 return (EINVAL); 3000 } 3001 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 3002 G_MIRROR_DEBUG(1, 3003 "Invalid device flags on disk %s (device %s), skipping.", 3004 pp->name, sc->sc_name); 3005 return (EINVAL); 3006 } 3007 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 3008 G_MIRROR_DEBUG(1, 3009 "Invalid disk flags on disk %s (device %s), skipping.", 3010 pp->name, sc->sc_name); 3011 return (EINVAL); 3012 } 3013 return (0); 3014 } 3015 3016 int 3017 g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 3018 struct g_mirror_metadata *md) 3019 { 3020 struct g_mirror_disk *disk; 3021 int error; 3022 3023 g_topology_assert_not(); 3024 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 3025 3026 error = g_mirror_check_metadata(sc, pp, md); 3027 if (error != 0) 3028 return (error); 3029 3030 if (md->md_genid < sc->sc_genid) { 3031 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 3032 pp->name, sc->sc_name); 3033 return (EINVAL); 3034 } 3035 3036 /* 3037 * If the component disk we're tasting has newer metadata than the 3038 * STARTING gmirror device, refresh the device from the component. 3039 */ 3040 error = g_mirror_refresh_device(sc, pp, md); 3041 if (error != 0) 3042 return (error); 3043 3044 disk = g_mirror_init_disk(sc, pp, md, &error); 3045 if (disk == NULL) 3046 return (error); 3047 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 3048 G_MIRROR_EVENT_WAIT); 3049 if (error != 0) 3050 return (error); 3051 if (md->md_version < G_MIRROR_VERSION) { 3052 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 3053 pp->name, md->md_version, G_MIRROR_VERSION); 3054 g_mirror_update_metadata(disk); 3055 } 3056 return (0); 3057 } 3058 3059 static void 3060 g_mirror_destroy_delayed(void *arg, int flag) 3061 { 3062 struct g_mirror_softc *sc; 3063 int error; 3064 3065 if (flag == EV_CANCEL) { 3066 G_MIRROR_DEBUG(1, "Destroying canceled."); 3067 return; 3068 } 3069 sc = arg; 3070 g_topology_unlock(); 3071 sx_xlock(&sc->sc_lock); 3072 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 3073 ("DESTROY flag set on %s.", sc->sc_name)); 3074 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0, 3075 ("CLOSEWAIT flag not set on %s.", sc->sc_name)); 3076 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 3077 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 3078 if (error != 0) { 3079 G_MIRROR_DEBUG(0, "Cannot destroy %s (error=%d).", 3080 sc->sc_name, error); 3081 sx_xunlock(&sc->sc_lock); 3082 } 3083 g_topology_lock(); 3084 } 3085 3086 static int 3087 g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 3088 { 3089 struct g_mirror_softc *sc; 3090 int error = 0; 3091 3092 g_topology_assert(); 3093 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 3094 acw, ace); 3095 3096 sc = pp->private; 3097 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 3098 3099 g_topology_unlock(); 3100 sx_xlock(&sc->sc_lock); 3101 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 3102 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 || 3103 LIST_EMPTY(&sc->sc_disks)) { 3104 if (acr > 0 || acw > 0 || ace > 0) 3105 error = ENXIO; 3106 goto end; 3107 } 3108 sc->sc_provider_open += acr + acw + ace; 3109 if (pp->acw + acw == 0) 3110 g_mirror_idle(sc, 0); 3111 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_CLOSEWAIT) != 0 && 3112 sc->sc_provider_open == 0) 3113 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, sc, NULL); 3114 end: 3115 sx_xunlock(&sc->sc_lock); 3116 g_topology_lock(); 3117 return (error); 3118 } 3119 3120 static void 3121 g_mirror_reinit_from_metadata(struct g_mirror_softc *sc, 3122 const struct g_mirror_metadata *md) 3123 { 3124 3125 sc->sc_genid = md->md_genid; 3126 sc->sc_syncid = md->md_syncid; 3127 3128 sc->sc_slice = md->md_slice; 3129 sc->sc_balance = md->md_balance; 3130 sc->sc_mediasize = md->md_mediasize; 3131 sc->sc_ndisks = md->md_all; 3132 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_MASK; 3133 sc->sc_flags |= (md->md_mflags & G_MIRROR_DEVICE_FLAG_MASK); 3134 } 3135 3136 struct g_geom * 3137 g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md, 3138 u_int type) 3139 { 3140 struct g_mirror_softc *sc; 3141 struct g_geom *gp; 3142 int error, timeout; 3143 3144 g_topology_assert(); 3145 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 3146 md->md_mid); 3147 3148 /* One disk is minimum. */ 3149 if (md->md_all < 1) 3150 return (NULL); 3151 /* 3152 * Action geom. 3153 */ 3154 gp = g_new_geomf(mp, "%s", md->md_name); 3155 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 3156 gp->start = g_mirror_start; 3157 gp->orphan = g_mirror_orphan; 3158 gp->access = g_mirror_access; 3159 gp->dumpconf = g_mirror_dumpconf; 3160 3161 sc->sc_type = type; 3162 sc->sc_id = md->md_mid; 3163 g_mirror_reinit_from_metadata(sc, md); 3164 sc->sc_sectorsize = md->md_sectorsize; 3165 sc->sc_bump_id = 0; 3166 sc->sc_idle = 1; 3167 sc->sc_last_write = time_uptime; 3168 sc->sc_writes = 0; 3169 sc->sc_refcnt = 1; 3170 sx_init(&sc->sc_lock, "gmirror:lock"); 3171 TAILQ_INIT(&sc->sc_queue); 3172 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 3173 TAILQ_INIT(&sc->sc_regular_delayed); 3174 TAILQ_INIT(&sc->sc_inflight); 3175 TAILQ_INIT(&sc->sc_sync_delayed); 3176 LIST_INIT(&sc->sc_disks); 3177 TAILQ_INIT(&sc->sc_events); 3178 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 3179 callout_init(&sc->sc_callout, 1); 3180 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 3181 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 3182 gp->softc = sc; 3183 sc->sc_geom = gp; 3184 sc->sc_provider = NULL; 3185 sc->sc_provider_open = 0; 3186 /* 3187 * Synchronization geom. 3188 */ 3189 gp = g_new_geomf(mp, "%s.sync", md->md_name); 3190 gp->softc = sc; 3191 gp->orphan = g_mirror_orphan; 3192 sc->sc_sync.ds_geom = gp; 3193 sc->sc_sync.ds_ndisks = 0; 3194 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 3195 "g_mirror %s", md->md_name); 3196 if (error != 0) { 3197 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 3198 sc->sc_name); 3199 g_destroy_geom(sc->sc_sync.ds_geom); 3200 g_destroy_geom(sc->sc_geom); 3201 g_mirror_free_device(sc); 3202 return (NULL); 3203 } 3204 3205 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 3206 sc->sc_name, sc->sc_ndisks, sc->sc_id); 3207 3208 sc->sc_rootmount = root_mount_hold("GMIRROR"); 3209 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 3210 3211 /* 3212 * Schedule startup timeout. 3213 */ 3214 timeout = g_mirror_timeout * hz; 3215 sc->sc_timeout_event = malloc(sizeof(struct g_mirror_event), M_MIRROR, 3216 M_WAITOK); 3217 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 3218 return (sc->sc_geom); 3219 } 3220 3221 int 3222 g_mirror_destroy(struct g_mirror_softc *sc, int how) 3223 { 3224 struct g_mirror_disk *disk; 3225 3226 g_topology_assert_not(); 3227 sx_assert(&sc->sc_lock, SX_XLOCKED); 3228 3229 if (sc->sc_provider_open != 0) { 3230 switch (how) { 3231 case G_MIRROR_DESTROY_SOFT: 3232 G_MIRROR_DEBUG(1, 3233 "Device %s is still open (%d).", sc->sc_name, 3234 sc->sc_provider_open); 3235 return (EBUSY); 3236 case G_MIRROR_DESTROY_DELAYED: 3237 G_MIRROR_DEBUG(1, 3238 "Device %s will be destroyed on last close.", 3239 sc->sc_name); 3240 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 3241 if (disk->d_state == 3242 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3243 g_mirror_sync_stop(disk, 1); 3244 } 3245 } 3246 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_CLOSEWAIT; 3247 return (EBUSY); 3248 case G_MIRROR_DESTROY_HARD: 3249 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 3250 "can't be definitely removed.", sc->sc_name); 3251 } 3252 } 3253 3254 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3255 sx_xunlock(&sc->sc_lock); 3256 return (0); 3257 } 3258 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3259 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DRAIN; 3260 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3261 sx_xunlock(&sc->sc_lock); 3262 mtx_lock(&sc->sc_queue_mtx); 3263 wakeup(sc); 3264 mtx_unlock(&sc->sc_queue_mtx); 3265 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3266 while (sc->sc_worker != NULL) 3267 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3268 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3269 sx_xlock(&sc->sc_lock); 3270 g_mirror_destroy_device(sc); 3271 return (0); 3272 } 3273 3274 static void 3275 g_mirror_taste_orphan(struct g_consumer *cp) 3276 { 3277 3278 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3279 cp->provider->name)); 3280 } 3281 3282 static struct g_geom * 3283 g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3284 { 3285 struct g_mirror_metadata md; 3286 struct g_mirror_softc *sc; 3287 struct g_consumer *cp; 3288 struct g_geom *gp; 3289 int error; 3290 3291 g_topology_assert(); 3292 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3293 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3294 3295 gp = g_new_geomf(mp, "mirror:taste"); 3296 /* 3297 * This orphan function should be never called. 3298 */ 3299 gp->orphan = g_mirror_taste_orphan; 3300 cp = g_new_consumer(gp); 3301 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 3302 error = g_attach(cp, pp); 3303 if (error == 0) { 3304 error = g_mirror_read_metadata(cp, &md); 3305 g_detach(cp); 3306 } 3307 g_destroy_consumer(cp); 3308 g_destroy_geom(gp); 3309 if (error != 0) 3310 return (NULL); 3311 gp = NULL; 3312 3313 if (md.md_provider[0] != '\0' && 3314 !g_compare_names(md.md_provider, pp->name)) 3315 return (NULL); 3316 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3317 return (NULL); 3318 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3319 G_MIRROR_DEBUG(0, 3320 "Device %s: provider %s marked as inactive, skipping.", 3321 md.md_name, pp->name); 3322 return (NULL); 3323 } 3324 if (g_mirror_debug >= 2) 3325 mirror_metadata_dump(&md); 3326 3327 /* 3328 * Let's check if device already exists. 3329 */ 3330 sc = NULL; 3331 LIST_FOREACH(gp, &mp->geom, geom) { 3332 sc = gp->softc; 3333 if (sc == NULL) 3334 continue; 3335 if (sc->sc_type != G_MIRROR_TYPE_AUTOMATIC) 3336 continue; 3337 if (sc->sc_sync.ds_geom == gp) 3338 continue; 3339 if (strcmp(md.md_name, sc->sc_name) != 0) 3340 continue; 3341 if (md.md_mid != sc->sc_id) { 3342 G_MIRROR_DEBUG(0, "Device %s already configured.", 3343 sc->sc_name); 3344 return (NULL); 3345 } 3346 break; 3347 } 3348 if (gp == NULL) { 3349 gp = g_mirror_create(mp, &md, G_MIRROR_TYPE_AUTOMATIC); 3350 if (gp == NULL) { 3351 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3352 md.md_name); 3353 return (NULL); 3354 } 3355 sc = gp->softc; 3356 } 3357 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3358 g_topology_unlock(); 3359 sx_xlock(&sc->sc_lock); 3360 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3361 error = g_mirror_add_disk(sc, pp, &md); 3362 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3363 if (error != 0) { 3364 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3365 pp->name, gp->name, error); 3366 if (LIST_EMPTY(&sc->sc_disks)) { 3367 g_cancel_event(sc); 3368 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3369 g_topology_lock(); 3370 return (NULL); 3371 } 3372 gp = NULL; 3373 } 3374 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3375 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3376 g_topology_lock(); 3377 return (NULL); 3378 } 3379 sx_xunlock(&sc->sc_lock); 3380 g_topology_lock(); 3381 return (gp); 3382 } 3383 3384 static void 3385 g_mirror_resize(struct g_consumer *cp) 3386 { 3387 struct g_mirror_disk *disk; 3388 3389 g_topology_assert(); 3390 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3391 3392 disk = cp->private; 3393 if (disk == NULL) 3394 return; 3395 g_topology_unlock(); 3396 g_mirror_update_metadata(disk); 3397 g_topology_lock(); 3398 } 3399 3400 static int 3401 g_mirror_destroy_geom(struct gctl_req *req __unused, 3402 struct g_class *mp __unused, struct g_geom *gp) 3403 { 3404 struct g_mirror_softc *sc; 3405 int error; 3406 3407 g_topology_unlock(); 3408 sc = gp->softc; 3409 sx_xlock(&sc->sc_lock); 3410 g_cancel_event(sc); 3411 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3412 if (error != 0) 3413 sx_xunlock(&sc->sc_lock); 3414 g_topology_lock(); 3415 return (error); 3416 } 3417 3418 static void 3419 g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3420 struct g_consumer *cp, struct g_provider *pp) 3421 { 3422 struct g_mirror_softc *sc; 3423 3424 g_topology_assert(); 3425 3426 sc = gp->softc; 3427 if (sc == NULL) 3428 return; 3429 /* Skip synchronization geom. */ 3430 if (gp == sc->sc_sync.ds_geom) 3431 return; 3432 if (pp != NULL) { 3433 /* Nothing here. */ 3434 } else if (cp != NULL) { 3435 struct g_mirror_disk *disk; 3436 3437 disk = cp->private; 3438 if (disk == NULL) 3439 return; 3440 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3441 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3442 sbuf_printf(sb, "%s<Synchronized>", indent); 3443 if (disk->d_sync.ds_offset == 0) 3444 sbuf_cat(sb, "0%"); 3445 else 3446 sbuf_printf(sb, "%u%%", 3447 (u_int)((disk->d_sync.ds_offset * 100) / 3448 sc->sc_mediasize)); 3449 sbuf_cat(sb, "</Synchronized>\n"); 3450 if (disk->d_sync.ds_offset > 0) 3451 sbuf_printf(sb, "%s<BytesSynced>%jd" 3452 "</BytesSynced>\n", indent, 3453 (intmax_t)disk->d_sync.ds_offset); 3454 } 3455 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3456 disk->d_sync.ds_syncid); 3457 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3458 disk->d_genid); 3459 sbuf_printf(sb, "%s<Flags>", indent); 3460 if (disk->d_flags == 0) 3461 sbuf_cat(sb, "NONE"); 3462 else { 3463 int first = 1; 3464 3465 #define ADD_FLAG(flag, name) do { \ 3466 if ((disk->d_flags & (flag)) != 0) { \ 3467 if (!first) \ 3468 sbuf_cat(sb, ", "); \ 3469 else \ 3470 first = 0; \ 3471 sbuf_cat(sb, name); \ 3472 } \ 3473 } while (0) 3474 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3475 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3476 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3477 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3478 "SYNCHRONIZING"); 3479 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3480 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3481 #undef ADD_FLAG 3482 } 3483 sbuf_cat(sb, "</Flags>\n"); 3484 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3485 disk->d_priority); 3486 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3487 g_mirror_disk_state2str(disk->d_state)); 3488 } else { 3489 sbuf_printf(sb, "%s<Type>", indent); 3490 switch (sc->sc_type) { 3491 case G_MIRROR_TYPE_AUTOMATIC: 3492 sbuf_cat(sb, "AUTOMATIC"); 3493 break; 3494 case G_MIRROR_TYPE_MANUAL: 3495 sbuf_cat(sb, "MANUAL"); 3496 break; 3497 default: 3498 sbuf_cat(sb, "UNKNOWN"); 3499 break; 3500 } 3501 sbuf_cat(sb, "</Type>\n"); 3502 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3503 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3504 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3505 sbuf_printf(sb, "%s<Flags>", indent); 3506 if (sc->sc_flags == 0) 3507 sbuf_cat(sb, "NONE"); 3508 else { 3509 int first = 1; 3510 3511 #define ADD_FLAG(flag, name) do { \ 3512 if ((sc->sc_flags & (flag)) != 0) { \ 3513 if (!first) \ 3514 sbuf_cat(sb, ", "); \ 3515 else \ 3516 first = 0; \ 3517 sbuf_cat(sb, name); \ 3518 } \ 3519 } while (0) 3520 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3521 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3522 #undef ADD_FLAG 3523 } 3524 sbuf_cat(sb, "</Flags>\n"); 3525 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3526 (u_int)sc->sc_slice); 3527 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3528 balance_name(sc->sc_balance)); 3529 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3530 sc->sc_ndisks); 3531 sbuf_printf(sb, "%s<State>", indent); 3532 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3533 sbuf_printf(sb, "%s", "STARTING"); 3534 else if (sc->sc_ndisks == 3535 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3536 sbuf_printf(sb, "%s", "COMPLETE"); 3537 else 3538 sbuf_printf(sb, "%s", "DEGRADED"); 3539 sbuf_cat(sb, "</State>\n"); 3540 } 3541 } 3542 3543 static void 3544 g_mirror_shutdown_post_sync(void *arg, int howto) 3545 { 3546 struct g_class *mp; 3547 struct g_geom *gp, *gp2; 3548 struct g_mirror_softc *sc; 3549 int error; 3550 3551 if (KERNEL_PANICKED()) 3552 return; 3553 3554 mp = arg; 3555 g_topology_lock(); 3556 g_mirror_shutdown = 1; 3557 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3558 if ((sc = gp->softc) == NULL) 3559 continue; 3560 /* Skip synchronization geom. */ 3561 if (gp == sc->sc_sync.ds_geom) 3562 continue; 3563 g_topology_unlock(); 3564 sx_xlock(&sc->sc_lock); 3565 g_mirror_idle(sc, -1); 3566 g_cancel_event(sc); 3567 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3568 if (error != 0) 3569 sx_xunlock(&sc->sc_lock); 3570 g_topology_lock(); 3571 } 3572 g_topology_unlock(); 3573 } 3574 3575 static void 3576 g_mirror_init(struct g_class *mp) 3577 { 3578 3579 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3580 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3581 if (g_mirror_post_sync == NULL) 3582 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3583 } 3584 3585 static void 3586 g_mirror_fini(struct g_class *mp) 3587 { 3588 3589 if (g_mirror_post_sync != NULL) 3590 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3591 } 3592 3593 /* 3594 * Refresh the mirror device's metadata when gmirror encounters a newer 3595 * generation as the individual components are being added to the mirror set. 3596 */ 3597 static int 3598 g_mirror_refresh_device(struct g_mirror_softc *sc, const struct g_provider *pp, 3599 const struct g_mirror_metadata *md) 3600 { 3601 3602 g_topology_assert_not(); 3603 sx_assert(&sc->sc_lock, SX_XLOCKED); 3604 3605 KASSERT(sc->sc_genid <= md->md_genid, 3606 ("%s: attempted to refresh from stale component %s (device %s) " 3607 "(%u < %u).", __func__, pp->name, sc->sc_name, md->md_genid, 3608 sc->sc_genid)); 3609 3610 if (sc->sc_genid > md->md_genid || (sc->sc_genid == md->md_genid && 3611 sc->sc_syncid >= md->md_syncid)) 3612 return (0); 3613 3614 G_MIRROR_DEBUG(0, "Found newer version for device %s (genid: curr=%u " 3615 "new=%u; syncid: curr=%u new=%u; ndisks: curr=%u new=%u; " 3616 "provider=%s).", sc->sc_name, sc->sc_genid, md->md_genid, 3617 sc->sc_syncid, md->md_syncid, sc->sc_ndisks, md->md_all, pp->name); 3618 3619 if (sc->sc_state != G_MIRROR_DEVICE_STATE_STARTING) { 3620 /* Probable data corruption detected */ 3621 G_MIRROR_DEBUG(0, "Cannot refresh metadata in %s state " 3622 "(device=%s genid=%u). A stale mirror device was launched.", 3623 g_mirror_device_state2str(sc->sc_state), sc->sc_name, 3624 sc->sc_genid); 3625 return (EINVAL); 3626 } 3627 3628 /* Update softc */ 3629 g_mirror_reinit_from_metadata(sc, md); 3630 3631 G_MIRROR_DEBUG(1, "Refresh device %s (id=%u, state=%s) from disk %s " 3632 "(genid=%u syncid=%u md_all=%u).", sc->sc_name, md->md_mid, 3633 g_mirror_device_state2str(sc->sc_state), pp->name, md->md_genid, 3634 md->md_syncid, (unsigned)md->md_all); 3635 3636 return (0); 3637 } 3638 3639 DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3640 MODULE_VERSION(geom_mirror, 0); 3641