g_mirror.c revision 259929
1/*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/geom/mirror/g_mirror.c 259929 2013-12-27 02:43:53Z ae $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/limits.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sbuf.h> 39#include <sys/sysctl.h> 40#include <sys/malloc.h> 41#include <sys/eventhandler.h> 42#include <vm/uma.h> 43#include <geom/geom.h> 44#include <sys/proc.h> 45#include <sys/kthread.h> 46#include <sys/sched.h> 47#include <geom/mirror/g_mirror.h> 48 49FEATURE(geom_mirror, "GEOM mirroring support"); 50 51static MALLOC_DEFINE(M_MIRROR, "mirror_data", "GEOM_MIRROR Data"); 52 53SYSCTL_DECL(_kern_geom); 54static SYSCTL_NODE(_kern_geom, OID_AUTO, mirror, CTLFLAG_RW, 0, 55 "GEOM_MIRROR stuff"); 56u_int g_mirror_debug = 0; 57TUNABLE_INT("kern.geom.mirror.debug", &g_mirror_debug); 58SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, debug, CTLFLAG_RW, &g_mirror_debug, 0, 59 "Debug level"); 60static u_int g_mirror_timeout = 4; 61TUNABLE_INT("kern.geom.mirror.timeout", &g_mirror_timeout); 62SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, timeout, CTLFLAG_RW, &g_mirror_timeout, 63 0, "Time to wait on all mirror components"); 64static u_int g_mirror_idletime = 5; 65TUNABLE_INT("kern.geom.mirror.idletime", &g_mirror_idletime); 66SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, idletime, CTLFLAG_RW, 67 &g_mirror_idletime, 0, "Mark components as clean when idling"); 68static u_int g_mirror_disconnect_on_failure = 1; 69TUNABLE_INT("kern.geom.mirror.disconnect_on_failure", 70 &g_mirror_disconnect_on_failure); 71SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, disconnect_on_failure, CTLFLAG_RW, 72 &g_mirror_disconnect_on_failure, 0, "Disconnect component on I/O failure."); 73static u_int g_mirror_syncreqs = 2; 74TUNABLE_INT("kern.geom.mirror.sync_requests", &g_mirror_syncreqs); 75SYSCTL_UINT(_kern_geom_mirror, OID_AUTO, sync_requests, CTLFLAG_RDTUN, 76 &g_mirror_syncreqs, 0, "Parallel synchronization I/O requests."); 77 78#define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \ 79 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \ 80 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \ 81 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \ 82} while (0) 83 84static eventhandler_tag g_mirror_post_sync = NULL; 85static int g_mirror_shutdown = 0; 86 87static int g_mirror_destroy_geom(struct gctl_req *req, struct g_class *mp, 88 struct g_geom *gp); 89static g_taste_t g_mirror_taste; 90static g_resize_t g_mirror_resize; 91static void g_mirror_init(struct g_class *mp); 92static void g_mirror_fini(struct g_class *mp); 93 94struct g_class g_mirror_class = { 95 .name = G_MIRROR_CLASS_NAME, 96 .version = G_VERSION, 97 .ctlreq = g_mirror_config, 98 .taste = g_mirror_taste, 99 .destroy_geom = g_mirror_destroy_geom, 100 .init = g_mirror_init, 101 .fini = g_mirror_fini, 102 .resize = g_mirror_resize 103}; 104 105 106static void g_mirror_destroy_provider(struct g_mirror_softc *sc); 107static int g_mirror_update_disk(struct g_mirror_disk *disk, u_int state); 108static void g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force); 109static void g_mirror_dumpconf(struct sbuf *sb, const char *indent, 110 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 111static void g_mirror_sync_stop(struct g_mirror_disk *disk, int type); 112static void g_mirror_register_request(struct bio *bp); 113static void g_mirror_sync_release(struct g_mirror_softc *sc); 114 115 116static const char * 117g_mirror_disk_state2str(int state) 118{ 119 120 switch (state) { 121 case G_MIRROR_DISK_STATE_NONE: 122 return ("NONE"); 123 case G_MIRROR_DISK_STATE_NEW: 124 return ("NEW"); 125 case G_MIRROR_DISK_STATE_ACTIVE: 126 return ("ACTIVE"); 127 case G_MIRROR_DISK_STATE_STALE: 128 return ("STALE"); 129 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 130 return ("SYNCHRONIZING"); 131 case G_MIRROR_DISK_STATE_DISCONNECTED: 132 return ("DISCONNECTED"); 133 case G_MIRROR_DISK_STATE_DESTROY: 134 return ("DESTROY"); 135 default: 136 return ("INVALID"); 137 } 138} 139 140static const char * 141g_mirror_device_state2str(int state) 142{ 143 144 switch (state) { 145 case G_MIRROR_DEVICE_STATE_STARTING: 146 return ("STARTING"); 147 case G_MIRROR_DEVICE_STATE_RUNNING: 148 return ("RUNNING"); 149 default: 150 return ("INVALID"); 151 } 152} 153 154static const char * 155g_mirror_get_diskname(struct g_mirror_disk *disk) 156{ 157 158 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL) 159 return ("[unknown]"); 160 return (disk->d_name); 161} 162 163/* 164 * --- Events handling functions --- 165 * Events in geom_mirror are used to maintain disks and device status 166 * from one thread to simplify locking. 167 */ 168static void 169g_mirror_event_free(struct g_mirror_event *ep) 170{ 171 172 free(ep, M_MIRROR); 173} 174 175int 176g_mirror_event_send(void *arg, int state, int flags) 177{ 178 struct g_mirror_softc *sc; 179 struct g_mirror_disk *disk; 180 struct g_mirror_event *ep; 181 int error; 182 183 ep = malloc(sizeof(*ep), M_MIRROR, M_WAITOK); 184 G_MIRROR_DEBUG(4, "%s: Sending event %p.", __func__, ep); 185 if ((flags & G_MIRROR_EVENT_DEVICE) != 0) { 186 disk = NULL; 187 sc = arg; 188 } else { 189 disk = arg; 190 sc = disk->d_softc; 191 } 192 ep->e_disk = disk; 193 ep->e_state = state; 194 ep->e_flags = flags; 195 ep->e_error = 0; 196 mtx_lock(&sc->sc_events_mtx); 197 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next); 198 mtx_unlock(&sc->sc_events_mtx); 199 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 200 mtx_lock(&sc->sc_queue_mtx); 201 wakeup(sc); 202 mtx_unlock(&sc->sc_queue_mtx); 203 if ((flags & G_MIRROR_EVENT_DONTWAIT) != 0) 204 return (0); 205 sx_assert(&sc->sc_lock, SX_XLOCKED); 206 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, ep); 207 sx_xunlock(&sc->sc_lock); 208 while ((ep->e_flags & G_MIRROR_EVENT_DONE) == 0) { 209 mtx_lock(&sc->sc_events_mtx); 210 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "m:event", 211 hz * 5); 212 } 213 error = ep->e_error; 214 g_mirror_event_free(ep); 215 sx_xlock(&sc->sc_lock); 216 return (error); 217} 218 219static struct g_mirror_event * 220g_mirror_event_get(struct g_mirror_softc *sc) 221{ 222 struct g_mirror_event *ep; 223 224 mtx_lock(&sc->sc_events_mtx); 225 ep = TAILQ_FIRST(&sc->sc_events); 226 mtx_unlock(&sc->sc_events_mtx); 227 return (ep); 228} 229 230static void 231g_mirror_event_remove(struct g_mirror_softc *sc, struct g_mirror_event *ep) 232{ 233 234 mtx_lock(&sc->sc_events_mtx); 235 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 236 mtx_unlock(&sc->sc_events_mtx); 237} 238 239static void 240g_mirror_event_cancel(struct g_mirror_disk *disk) 241{ 242 struct g_mirror_softc *sc; 243 struct g_mirror_event *ep, *tmpep; 244 245 sc = disk->d_softc; 246 sx_assert(&sc->sc_lock, SX_XLOCKED); 247 248 mtx_lock(&sc->sc_events_mtx); 249 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) { 250 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) 251 continue; 252 if (ep->e_disk != disk) 253 continue; 254 TAILQ_REMOVE(&sc->sc_events, ep, e_next); 255 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 256 g_mirror_event_free(ep); 257 else { 258 ep->e_error = ECANCELED; 259 wakeup(ep); 260 } 261 } 262 mtx_unlock(&sc->sc_events_mtx); 263} 264 265/* 266 * Return the number of disks in given state. 267 * If state is equal to -1, count all connected disks. 268 */ 269u_int 270g_mirror_ndisks(struct g_mirror_softc *sc, int state) 271{ 272 struct g_mirror_disk *disk; 273 u_int n = 0; 274 275 sx_assert(&sc->sc_lock, SX_LOCKED); 276 277 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 278 if (state == -1 || disk->d_state == state) 279 n++; 280 } 281 return (n); 282} 283 284/* 285 * Find a disk in mirror by its disk ID. 286 */ 287static struct g_mirror_disk * 288g_mirror_id2disk(struct g_mirror_softc *sc, uint32_t id) 289{ 290 struct g_mirror_disk *disk; 291 292 sx_assert(&sc->sc_lock, SX_XLOCKED); 293 294 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 295 if (disk->d_id == id) 296 return (disk); 297 } 298 return (NULL); 299} 300 301static u_int 302g_mirror_nrequests(struct g_mirror_softc *sc, struct g_consumer *cp) 303{ 304 struct bio *bp; 305 u_int nreqs = 0; 306 307 mtx_lock(&sc->sc_queue_mtx); 308 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 309 if (bp->bio_from == cp) 310 nreqs++; 311 } 312 mtx_unlock(&sc->sc_queue_mtx); 313 return (nreqs); 314} 315 316static int 317g_mirror_is_busy(struct g_mirror_softc *sc, struct g_consumer *cp) 318{ 319 320 if (cp->index > 0) { 321 G_MIRROR_DEBUG(2, 322 "I/O requests for %s exist, can't destroy it now.", 323 cp->provider->name); 324 return (1); 325 } 326 if (g_mirror_nrequests(sc, cp) > 0) { 327 G_MIRROR_DEBUG(2, 328 "I/O requests for %s in queue, can't destroy it now.", 329 cp->provider->name); 330 return (1); 331 } 332 return (0); 333} 334 335static void 336g_mirror_destroy_consumer(void *arg, int flags __unused) 337{ 338 struct g_consumer *cp; 339 340 g_topology_assert(); 341 342 cp = arg; 343 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", cp->provider->name); 344 g_detach(cp); 345 g_destroy_consumer(cp); 346} 347 348static void 349g_mirror_kill_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 350{ 351 struct g_provider *pp; 352 int retaste_wait; 353 354 g_topology_assert(); 355 356 cp->private = NULL; 357 if (g_mirror_is_busy(sc, cp)) 358 return; 359 pp = cp->provider; 360 retaste_wait = 0; 361 if (cp->acw == 1) { 362 if ((pp->geom->flags & G_GEOM_WITHER) == 0) 363 retaste_wait = 1; 364 } 365 G_MIRROR_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr, 366 -cp->acw, -cp->ace, 0); 367 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 368 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 369 if (retaste_wait) { 370 /* 371 * After retaste event was send (inside g_access()), we can send 372 * event to detach and destroy consumer. 373 * A class, which has consumer to the given provider connected 374 * will not receive retaste event for the provider. 375 * This is the way how I ignore retaste events when I close 376 * consumers opened for write: I detach and destroy consumer 377 * after retaste event is sent. 378 */ 379 g_post_event(g_mirror_destroy_consumer, cp, M_WAITOK, NULL); 380 return; 381 } 382 G_MIRROR_DEBUG(1, "Consumer %s destroyed.", pp->name); 383 g_detach(cp); 384 g_destroy_consumer(cp); 385} 386 387static int 388g_mirror_connect_disk(struct g_mirror_disk *disk, struct g_provider *pp) 389{ 390 struct g_consumer *cp; 391 int error; 392 393 g_topology_assert_not(); 394 KASSERT(disk->d_consumer == NULL, 395 ("Disk already connected (device %s).", disk->d_softc->sc_name)); 396 397 g_topology_lock(); 398 cp = g_new_consumer(disk->d_softc->sc_geom); 399 cp->flags |= G_CF_DIRECT_RECEIVE; 400 error = g_attach(cp, pp); 401 if (error != 0) { 402 g_destroy_consumer(cp); 403 g_topology_unlock(); 404 return (error); 405 } 406 error = g_access(cp, 1, 1, 1); 407 if (error != 0) { 408 g_detach(cp); 409 g_destroy_consumer(cp); 410 g_topology_unlock(); 411 G_MIRROR_DEBUG(0, "Cannot open consumer %s (error=%d).", 412 pp->name, error); 413 return (error); 414 } 415 g_topology_unlock(); 416 disk->d_consumer = cp; 417 disk->d_consumer->private = disk; 418 disk->d_consumer->index = 0; 419 420 G_MIRROR_DEBUG(2, "Disk %s connected.", g_mirror_get_diskname(disk)); 421 return (0); 422} 423 424static void 425g_mirror_disconnect_consumer(struct g_mirror_softc *sc, struct g_consumer *cp) 426{ 427 428 g_topology_assert(); 429 430 if (cp == NULL) 431 return; 432 if (cp->provider != NULL) 433 g_mirror_kill_consumer(sc, cp); 434 else 435 g_destroy_consumer(cp); 436} 437 438/* 439 * Initialize disk. This means allocate memory, create consumer, attach it 440 * to the provider and open access (r1w1e1) to it. 441 */ 442static struct g_mirror_disk * 443g_mirror_init_disk(struct g_mirror_softc *sc, struct g_provider *pp, 444 struct g_mirror_metadata *md, int *errorp) 445{ 446 struct g_mirror_disk *disk; 447 int i, error; 448 449 disk = malloc(sizeof(*disk), M_MIRROR, M_NOWAIT | M_ZERO); 450 if (disk == NULL) { 451 error = ENOMEM; 452 goto fail; 453 } 454 disk->d_softc = sc; 455 error = g_mirror_connect_disk(disk, pp); 456 if (error != 0) 457 goto fail; 458 disk->d_id = md->md_did; 459 disk->d_state = G_MIRROR_DISK_STATE_NONE; 460 disk->d_priority = md->md_priority; 461 disk->d_flags = md->md_dflags; 462 error = g_getattr("GEOM::candelete", disk->d_consumer, &i); 463 if (error == 0 && i != 0) 464 disk->d_flags |= G_MIRROR_DISK_FLAG_CANDELETE; 465 if (md->md_provider[0] != '\0') 466 disk->d_flags |= G_MIRROR_DISK_FLAG_HARDCODED; 467 disk->d_sync.ds_consumer = NULL; 468 disk->d_sync.ds_offset = md->md_sync_offset; 469 disk->d_sync.ds_offset_done = md->md_sync_offset; 470 disk->d_genid = md->md_genid; 471 disk->d_sync.ds_syncid = md->md_syncid; 472 if (errorp != NULL) 473 *errorp = 0; 474 return (disk); 475fail: 476 if (errorp != NULL) 477 *errorp = error; 478 if (disk != NULL) 479 free(disk, M_MIRROR); 480 return (NULL); 481} 482 483static void 484g_mirror_destroy_disk(struct g_mirror_disk *disk) 485{ 486 struct g_mirror_softc *sc; 487 488 g_topology_assert_not(); 489 sc = disk->d_softc; 490 sx_assert(&sc->sc_lock, SX_XLOCKED); 491 492 LIST_REMOVE(disk, d_next); 493 g_mirror_event_cancel(disk); 494 if (sc->sc_hint == disk) 495 sc->sc_hint = NULL; 496 switch (disk->d_state) { 497 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 498 g_mirror_sync_stop(disk, 1); 499 /* FALLTHROUGH */ 500 case G_MIRROR_DISK_STATE_NEW: 501 case G_MIRROR_DISK_STATE_STALE: 502 case G_MIRROR_DISK_STATE_ACTIVE: 503 g_topology_lock(); 504 g_mirror_disconnect_consumer(sc, disk->d_consumer); 505 g_topology_unlock(); 506 free(disk, M_MIRROR); 507 break; 508 default: 509 KASSERT(0 == 1, ("Wrong disk state (%s, %s).", 510 g_mirror_get_diskname(disk), 511 g_mirror_disk_state2str(disk->d_state))); 512 } 513} 514 515static void 516g_mirror_destroy_device(struct g_mirror_softc *sc) 517{ 518 struct g_mirror_disk *disk; 519 struct g_mirror_event *ep; 520 struct g_geom *gp; 521 struct g_consumer *cp, *tmpcp; 522 523 g_topology_assert_not(); 524 sx_assert(&sc->sc_lock, SX_XLOCKED); 525 526 gp = sc->sc_geom; 527 if (sc->sc_provider != NULL) 528 g_mirror_destroy_provider(sc); 529 for (disk = LIST_FIRST(&sc->sc_disks); disk != NULL; 530 disk = LIST_FIRST(&sc->sc_disks)) { 531 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 532 g_mirror_update_metadata(disk); 533 g_mirror_destroy_disk(disk); 534 } 535 while ((ep = g_mirror_event_get(sc)) != NULL) { 536 g_mirror_event_remove(sc, ep); 537 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) 538 g_mirror_event_free(ep); 539 else { 540 ep->e_error = ECANCELED; 541 ep->e_flags |= G_MIRROR_EVENT_DONE; 542 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, ep); 543 mtx_lock(&sc->sc_events_mtx); 544 wakeup(ep); 545 mtx_unlock(&sc->sc_events_mtx); 546 } 547 } 548 callout_drain(&sc->sc_callout); 549 550 g_topology_lock(); 551 LIST_FOREACH_SAFE(cp, &sc->sc_sync.ds_geom->consumer, consumer, tmpcp) { 552 g_mirror_disconnect_consumer(sc, cp); 553 } 554 g_wither_geom(sc->sc_sync.ds_geom, ENXIO); 555 G_MIRROR_DEBUG(0, "Device %s destroyed.", gp->name); 556 g_wither_geom(gp, ENXIO); 557 g_topology_unlock(); 558 mtx_destroy(&sc->sc_queue_mtx); 559 mtx_destroy(&sc->sc_events_mtx); 560 mtx_destroy(&sc->sc_done_mtx); 561 sx_xunlock(&sc->sc_lock); 562 sx_destroy(&sc->sc_lock); 563} 564 565static void 566g_mirror_orphan(struct g_consumer *cp) 567{ 568 struct g_mirror_disk *disk; 569 570 g_topology_assert(); 571 572 disk = cp->private; 573 if (disk == NULL) 574 return; 575 disk->d_softc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 576 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_DISCONNECTED, 577 G_MIRROR_EVENT_DONTWAIT); 578} 579 580/* 581 * Function should return the next active disk on the list. 582 * It is possible that it will be the same disk as given. 583 * If there are no active disks on list, NULL is returned. 584 */ 585static __inline struct g_mirror_disk * 586g_mirror_find_next(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 587{ 588 struct g_mirror_disk *dp; 589 590 for (dp = LIST_NEXT(disk, d_next); dp != disk; 591 dp = LIST_NEXT(dp, d_next)) { 592 if (dp == NULL) 593 dp = LIST_FIRST(&sc->sc_disks); 594 if (dp->d_state == G_MIRROR_DISK_STATE_ACTIVE) 595 break; 596 } 597 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 598 return (NULL); 599 return (dp); 600} 601 602static struct g_mirror_disk * 603g_mirror_get_disk(struct g_mirror_softc *sc) 604{ 605 struct g_mirror_disk *disk; 606 607 if (sc->sc_hint == NULL) { 608 sc->sc_hint = LIST_FIRST(&sc->sc_disks); 609 if (sc->sc_hint == NULL) 610 return (NULL); 611 } 612 disk = sc->sc_hint; 613 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) { 614 disk = g_mirror_find_next(sc, disk); 615 if (disk == NULL) 616 return (NULL); 617 } 618 sc->sc_hint = g_mirror_find_next(sc, disk); 619 return (disk); 620} 621 622static int 623g_mirror_write_metadata(struct g_mirror_disk *disk, 624 struct g_mirror_metadata *md) 625{ 626 struct g_mirror_softc *sc; 627 struct g_consumer *cp; 628 off_t offset, length; 629 u_char *sector; 630 int error = 0; 631 632 g_topology_assert_not(); 633 sc = disk->d_softc; 634 sx_assert(&sc->sc_lock, SX_LOCKED); 635 636 cp = disk->d_consumer; 637 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name)); 638 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name)); 639 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 640 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr, 641 cp->acw, cp->ace)); 642 length = cp->provider->sectorsize; 643 offset = cp->provider->mediasize - length; 644 sector = malloc((size_t)length, M_MIRROR, M_WAITOK | M_ZERO); 645 if (md != NULL && 646 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) { 647 /* 648 * Handle the case, when the size of parent provider reduced. 649 */ 650 if (offset < md->md_mediasize) 651 error = ENOSPC; 652 else 653 mirror_metadata_encode(md, sector); 654 } 655 if (error == 0) 656 error = g_write_data(cp, offset, sector, length); 657 free(sector, M_MIRROR); 658 if (error != 0) { 659 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 660 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 661 G_MIRROR_DEBUG(0, "Cannot write metadata on %s " 662 "(device=%s, error=%d).", 663 g_mirror_get_diskname(disk), sc->sc_name, error); 664 } else { 665 G_MIRROR_DEBUG(1, "Cannot write metadata on %s " 666 "(device=%s, error=%d).", 667 g_mirror_get_diskname(disk), sc->sc_name, error); 668 } 669 if (g_mirror_disconnect_on_failure && 670 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) { 671 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 672 g_mirror_event_send(disk, 673 G_MIRROR_DISK_STATE_DISCONNECTED, 674 G_MIRROR_EVENT_DONTWAIT); 675 } 676 } 677 return (error); 678} 679 680static int 681g_mirror_clear_metadata(struct g_mirror_disk *disk) 682{ 683 int error; 684 685 g_topology_assert_not(); 686 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED); 687 688 error = g_mirror_write_metadata(disk, NULL); 689 if (error == 0) { 690 G_MIRROR_DEBUG(2, "Metadata on %s cleared.", 691 g_mirror_get_diskname(disk)); 692 } else { 693 G_MIRROR_DEBUG(0, 694 "Cannot clear metadata on disk %s (error=%d).", 695 g_mirror_get_diskname(disk), error); 696 } 697 return (error); 698} 699 700void 701g_mirror_fill_metadata(struct g_mirror_softc *sc, struct g_mirror_disk *disk, 702 struct g_mirror_metadata *md) 703{ 704 705 strlcpy(md->md_magic, G_MIRROR_MAGIC, sizeof(md->md_magic)); 706 md->md_version = G_MIRROR_VERSION; 707 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name)); 708 md->md_mid = sc->sc_id; 709 md->md_all = sc->sc_ndisks; 710 md->md_slice = sc->sc_slice; 711 md->md_balance = sc->sc_balance; 712 md->md_genid = sc->sc_genid; 713 md->md_mediasize = sc->sc_mediasize; 714 md->md_sectorsize = sc->sc_sectorsize; 715 md->md_mflags = (sc->sc_flags & G_MIRROR_DEVICE_FLAG_MASK); 716 bzero(md->md_provider, sizeof(md->md_provider)); 717 if (disk == NULL) { 718 md->md_did = arc4random(); 719 md->md_priority = 0; 720 md->md_syncid = 0; 721 md->md_dflags = 0; 722 md->md_sync_offset = 0; 723 md->md_provsize = 0; 724 } else { 725 md->md_did = disk->d_id; 726 md->md_priority = disk->d_priority; 727 md->md_syncid = disk->d_sync.ds_syncid; 728 md->md_dflags = (disk->d_flags & G_MIRROR_DISK_FLAG_MASK); 729 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 730 md->md_sync_offset = disk->d_sync.ds_offset_done; 731 else 732 md->md_sync_offset = 0; 733 if ((disk->d_flags & G_MIRROR_DISK_FLAG_HARDCODED) != 0) { 734 strlcpy(md->md_provider, 735 disk->d_consumer->provider->name, 736 sizeof(md->md_provider)); 737 } 738 md->md_provsize = disk->d_consumer->provider->mediasize; 739 } 740} 741 742void 743g_mirror_update_metadata(struct g_mirror_disk *disk) 744{ 745 struct g_mirror_softc *sc; 746 struct g_mirror_metadata md; 747 int error; 748 749 g_topology_assert_not(); 750 sc = disk->d_softc; 751 sx_assert(&sc->sc_lock, SX_LOCKED); 752 753 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WIPE) == 0) 754 g_mirror_fill_metadata(sc, disk, &md); 755 error = g_mirror_write_metadata(disk, &md); 756 if (error == 0) { 757 G_MIRROR_DEBUG(2, "Metadata on %s updated.", 758 g_mirror_get_diskname(disk)); 759 } else { 760 G_MIRROR_DEBUG(0, 761 "Cannot update metadata on disk %s (error=%d).", 762 g_mirror_get_diskname(disk), error); 763 } 764} 765 766static void 767g_mirror_bump_syncid(struct g_mirror_softc *sc) 768{ 769 struct g_mirror_disk *disk; 770 771 g_topology_assert_not(); 772 sx_assert(&sc->sc_lock, SX_XLOCKED); 773 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 774 ("%s called with no active disks (device=%s).", __func__, 775 sc->sc_name)); 776 777 sc->sc_syncid++; 778 G_MIRROR_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name, 779 sc->sc_syncid); 780 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 781 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 782 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 783 disk->d_sync.ds_syncid = sc->sc_syncid; 784 g_mirror_update_metadata(disk); 785 } 786 } 787} 788 789static void 790g_mirror_bump_genid(struct g_mirror_softc *sc) 791{ 792 struct g_mirror_disk *disk; 793 794 g_topology_assert_not(); 795 sx_assert(&sc->sc_lock, SX_XLOCKED); 796 KASSERT(g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 0, 797 ("%s called with no active disks (device=%s).", __func__, 798 sc->sc_name)); 799 800 sc->sc_genid++; 801 G_MIRROR_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name, 802 sc->sc_genid); 803 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 804 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 805 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 806 disk->d_genid = sc->sc_genid; 807 g_mirror_update_metadata(disk); 808 } 809 } 810} 811 812static int 813g_mirror_idle(struct g_mirror_softc *sc, int acw) 814{ 815 struct g_mirror_disk *disk; 816 int timeout; 817 818 g_topology_assert_not(); 819 sx_assert(&sc->sc_lock, SX_XLOCKED); 820 821 if (sc->sc_provider == NULL) 822 return (0); 823 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 824 return (0); 825 if (sc->sc_idle) 826 return (0); 827 if (sc->sc_writes > 0) 828 return (0); 829 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) { 830 timeout = g_mirror_idletime - (time_uptime - sc->sc_last_write); 831 if (!g_mirror_shutdown && timeout > 0) 832 return (timeout); 833 } 834 sc->sc_idle = 1; 835 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 836 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 837 continue; 838 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 839 g_mirror_get_diskname(disk), sc->sc_name); 840 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 841 g_mirror_update_metadata(disk); 842 } 843 return (0); 844} 845 846static void 847g_mirror_unidle(struct g_mirror_softc *sc) 848{ 849 struct g_mirror_disk *disk; 850 851 g_topology_assert_not(); 852 sx_assert(&sc->sc_lock, SX_XLOCKED); 853 854 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 855 return; 856 sc->sc_idle = 0; 857 sc->sc_last_write = time_uptime; 858 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 859 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 860 continue; 861 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 862 g_mirror_get_diskname(disk), sc->sc_name); 863 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 864 g_mirror_update_metadata(disk); 865 } 866} 867 868static void 869g_mirror_flush_done(struct bio *bp) 870{ 871 struct g_mirror_softc *sc; 872 struct bio *pbp; 873 874 pbp = bp->bio_parent; 875 sc = pbp->bio_to->geom->softc; 876 mtx_lock(&sc->sc_done_mtx); 877 if (pbp->bio_error == 0) 878 pbp->bio_error = bp->bio_error; 879 pbp->bio_completed += bp->bio_completed; 880 pbp->bio_inbed++; 881 if (pbp->bio_children == pbp->bio_inbed) { 882 mtx_unlock(&sc->sc_done_mtx); 883 g_io_deliver(pbp, pbp->bio_error); 884 } else 885 mtx_unlock(&sc->sc_done_mtx); 886 g_destroy_bio(bp); 887} 888 889static void 890g_mirror_done(struct bio *bp) 891{ 892 struct g_mirror_softc *sc; 893 894 sc = bp->bio_from->geom->softc; 895 bp->bio_cflags = G_MIRROR_BIO_FLAG_REGULAR; 896 mtx_lock(&sc->sc_queue_mtx); 897 bioq_disksort(&sc->sc_queue, bp); 898 mtx_unlock(&sc->sc_queue_mtx); 899 wakeup(sc); 900} 901 902static void 903g_mirror_regular_request(struct bio *bp) 904{ 905 struct g_mirror_softc *sc; 906 struct g_mirror_disk *disk; 907 struct bio *pbp; 908 909 g_topology_assert_not(); 910 911 pbp = bp->bio_parent; 912 sc = pbp->bio_to->geom->softc; 913 bp->bio_from->index--; 914 if (bp->bio_cmd == BIO_WRITE) 915 sc->sc_writes--; 916 disk = bp->bio_from->private; 917 if (disk == NULL) { 918 g_topology_lock(); 919 g_mirror_kill_consumer(sc, bp->bio_from); 920 g_topology_unlock(); 921 } 922 923 pbp->bio_inbed++; 924 KASSERT(pbp->bio_inbed <= pbp->bio_children, 925 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed, 926 pbp->bio_children)); 927 if (bp->bio_error == 0 && pbp->bio_error == 0) { 928 G_MIRROR_LOGREQ(3, bp, "Request delivered."); 929 g_destroy_bio(bp); 930 if (pbp->bio_children == pbp->bio_inbed) { 931 G_MIRROR_LOGREQ(3, pbp, "Request delivered."); 932 pbp->bio_completed = pbp->bio_length; 933 if (pbp->bio_cmd == BIO_WRITE || 934 pbp->bio_cmd == BIO_DELETE) { 935 bioq_remove(&sc->sc_inflight, pbp); 936 /* Release delayed sync requests if possible. */ 937 g_mirror_sync_release(sc); 938 } 939 g_io_deliver(pbp, pbp->bio_error); 940 } 941 return; 942 } else if (bp->bio_error != 0) { 943 if (pbp->bio_error == 0) 944 pbp->bio_error = bp->bio_error; 945 if (disk != NULL) { 946 if ((disk->d_flags & G_MIRROR_DISK_FLAG_BROKEN) == 0) { 947 disk->d_flags |= G_MIRROR_DISK_FLAG_BROKEN; 948 G_MIRROR_LOGREQ(0, bp, 949 "Request failed (error=%d).", 950 bp->bio_error); 951 } else { 952 G_MIRROR_LOGREQ(1, bp, 953 "Request failed (error=%d).", 954 bp->bio_error); 955 } 956 if (g_mirror_disconnect_on_failure && 957 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) > 1) 958 { 959 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 960 g_mirror_event_send(disk, 961 G_MIRROR_DISK_STATE_DISCONNECTED, 962 G_MIRROR_EVENT_DONTWAIT); 963 } 964 } 965 switch (pbp->bio_cmd) { 966 case BIO_DELETE: 967 case BIO_WRITE: 968 pbp->bio_inbed--; 969 pbp->bio_children--; 970 break; 971 } 972 } 973 g_destroy_bio(bp); 974 975 switch (pbp->bio_cmd) { 976 case BIO_READ: 977 if (pbp->bio_inbed < pbp->bio_children) 978 break; 979 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 1) 980 g_io_deliver(pbp, pbp->bio_error); 981 else { 982 pbp->bio_error = 0; 983 mtx_lock(&sc->sc_queue_mtx); 984 bioq_disksort(&sc->sc_queue, pbp); 985 mtx_unlock(&sc->sc_queue_mtx); 986 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 987 wakeup(sc); 988 } 989 break; 990 case BIO_DELETE: 991 case BIO_WRITE: 992 if (pbp->bio_children == 0) { 993 /* 994 * All requests failed. 995 */ 996 } else if (pbp->bio_inbed < pbp->bio_children) { 997 /* Do nothing. */ 998 break; 999 } else if (pbp->bio_children == pbp->bio_inbed) { 1000 /* Some requests succeeded. */ 1001 pbp->bio_error = 0; 1002 pbp->bio_completed = pbp->bio_length; 1003 } 1004 bioq_remove(&sc->sc_inflight, pbp); 1005 /* Release delayed sync requests if possible. */ 1006 g_mirror_sync_release(sc); 1007 g_io_deliver(pbp, pbp->bio_error); 1008 break; 1009 default: 1010 KASSERT(1 == 0, ("Invalid request: %u.", pbp->bio_cmd)); 1011 break; 1012 } 1013} 1014 1015static void 1016g_mirror_sync_done(struct bio *bp) 1017{ 1018 struct g_mirror_softc *sc; 1019 1020 G_MIRROR_LOGREQ(3, bp, "Synchronization request delivered."); 1021 sc = bp->bio_from->geom->softc; 1022 bp->bio_cflags = G_MIRROR_BIO_FLAG_SYNC; 1023 mtx_lock(&sc->sc_queue_mtx); 1024 bioq_disksort(&sc->sc_queue, bp); 1025 mtx_unlock(&sc->sc_queue_mtx); 1026 wakeup(sc); 1027} 1028 1029static void 1030g_mirror_kernel_dump(struct bio *bp) 1031{ 1032 struct g_mirror_softc *sc; 1033 struct g_mirror_disk *disk; 1034 struct bio *cbp; 1035 struct g_kerneldump *gkd; 1036 1037 /* 1038 * We configure dumping to the first component, because this component 1039 * will be used for reading with 'prefer' balance algorithm. 1040 * If the component with the higest priority is currently disconnected 1041 * we will not be able to read the dump after the reboot if it will be 1042 * connected and synchronized later. Can we do something better? 1043 */ 1044 sc = bp->bio_to->geom->softc; 1045 disk = LIST_FIRST(&sc->sc_disks); 1046 1047 gkd = (struct g_kerneldump *)bp->bio_data; 1048 if (gkd->length > bp->bio_to->mediasize) 1049 gkd->length = bp->bio_to->mediasize; 1050 cbp = g_clone_bio(bp); 1051 if (cbp == NULL) { 1052 g_io_deliver(bp, ENOMEM); 1053 return; 1054 } 1055 cbp->bio_done = g_std_done; 1056 g_io_request(cbp, disk->d_consumer); 1057 G_MIRROR_DEBUG(1, "Kernel dump will go to %s.", 1058 g_mirror_get_diskname(disk)); 1059} 1060 1061static void 1062g_mirror_flush(struct g_mirror_softc *sc, struct bio *bp) 1063{ 1064 struct bio_queue_head queue; 1065 struct g_mirror_disk *disk; 1066 struct g_consumer *cp; 1067 struct bio *cbp; 1068 1069 bioq_init(&queue); 1070 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1071 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1072 continue; 1073 cbp = g_clone_bio(bp); 1074 if (cbp == NULL) { 1075 while ((cbp = bioq_takefirst(&queue)) != NULL) 1076 g_destroy_bio(cbp); 1077 if (bp->bio_error == 0) 1078 bp->bio_error = ENOMEM; 1079 g_io_deliver(bp, bp->bio_error); 1080 return; 1081 } 1082 bioq_insert_tail(&queue, cbp); 1083 cbp->bio_done = g_mirror_flush_done; 1084 cbp->bio_caller1 = disk; 1085 cbp->bio_to = disk->d_consumer->provider; 1086 } 1087 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1088 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1089 disk = cbp->bio_caller1; 1090 cbp->bio_caller1 = NULL; 1091 cp = disk->d_consumer; 1092 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1093 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1094 cp->acr, cp->acw, cp->ace)); 1095 g_io_request(cbp, disk->d_consumer); 1096 } 1097} 1098 1099static void 1100g_mirror_start(struct bio *bp) 1101{ 1102 struct g_mirror_softc *sc; 1103 1104 sc = bp->bio_to->geom->softc; 1105 /* 1106 * If sc == NULL or there are no valid disks, provider's error 1107 * should be set and g_mirror_start() should not be called at all. 1108 */ 1109 KASSERT(sc != NULL && sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1110 ("Provider's error should be set (error=%d)(mirror=%s).", 1111 bp->bio_to->error, bp->bio_to->name)); 1112 G_MIRROR_LOGREQ(3, bp, "Request received."); 1113 1114 switch (bp->bio_cmd) { 1115 case BIO_READ: 1116 case BIO_WRITE: 1117 case BIO_DELETE: 1118 break; 1119 case BIO_FLUSH: 1120 g_mirror_flush(sc, bp); 1121 return; 1122 case BIO_GETATTR: 1123 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 1124 return; 1125 else if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) { 1126 g_mirror_kernel_dump(bp); 1127 return; 1128 } 1129 /* FALLTHROUGH */ 1130 default: 1131 g_io_deliver(bp, EOPNOTSUPP); 1132 return; 1133 } 1134 mtx_lock(&sc->sc_queue_mtx); 1135 bioq_disksort(&sc->sc_queue, bp); 1136 mtx_unlock(&sc->sc_queue_mtx); 1137 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 1138 wakeup(sc); 1139} 1140 1141/* 1142 * Return TRUE if the given request is colliding with a in-progress 1143 * synchronization request. 1144 */ 1145static int 1146g_mirror_sync_collision(struct g_mirror_softc *sc, struct bio *bp) 1147{ 1148 struct g_mirror_disk *disk; 1149 struct bio *sbp; 1150 off_t rstart, rend, sstart, send; 1151 int i; 1152 1153 if (sc->sc_sync.ds_ndisks == 0) 1154 return (0); 1155 rstart = bp->bio_offset; 1156 rend = bp->bio_offset + bp->bio_length; 1157 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1158 if (disk->d_state != G_MIRROR_DISK_STATE_SYNCHRONIZING) 1159 continue; 1160 for (i = 0; i < g_mirror_syncreqs; i++) { 1161 sbp = disk->d_sync.ds_bios[i]; 1162 if (sbp == NULL) 1163 continue; 1164 sstart = sbp->bio_offset; 1165 send = sbp->bio_offset + sbp->bio_length; 1166 if (rend > sstart && rstart < send) 1167 return (1); 1168 } 1169 } 1170 return (0); 1171} 1172 1173/* 1174 * Return TRUE if the given sync request is colliding with a in-progress regular 1175 * request. 1176 */ 1177static int 1178g_mirror_regular_collision(struct g_mirror_softc *sc, struct bio *sbp) 1179{ 1180 off_t rstart, rend, sstart, send; 1181 struct bio *bp; 1182 1183 if (sc->sc_sync.ds_ndisks == 0) 1184 return (0); 1185 sstart = sbp->bio_offset; 1186 send = sbp->bio_offset + sbp->bio_length; 1187 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) { 1188 rstart = bp->bio_offset; 1189 rend = bp->bio_offset + bp->bio_length; 1190 if (rend > sstart && rstart < send) 1191 return (1); 1192 } 1193 return (0); 1194} 1195 1196/* 1197 * Puts request onto delayed queue. 1198 */ 1199static void 1200g_mirror_regular_delay(struct g_mirror_softc *sc, struct bio *bp) 1201{ 1202 1203 G_MIRROR_LOGREQ(2, bp, "Delaying request."); 1204 bioq_insert_head(&sc->sc_regular_delayed, bp); 1205} 1206 1207/* 1208 * Puts synchronization request onto delayed queue. 1209 */ 1210static void 1211g_mirror_sync_delay(struct g_mirror_softc *sc, struct bio *bp) 1212{ 1213 1214 G_MIRROR_LOGREQ(2, bp, "Delaying synchronization request."); 1215 bioq_insert_tail(&sc->sc_sync_delayed, bp); 1216} 1217 1218/* 1219 * Releases delayed regular requests which don't collide anymore with sync 1220 * requests. 1221 */ 1222static void 1223g_mirror_regular_release(struct g_mirror_softc *sc) 1224{ 1225 struct bio *bp, *bp2; 1226 1227 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) { 1228 if (g_mirror_sync_collision(sc, bp)) 1229 continue; 1230 bioq_remove(&sc->sc_regular_delayed, bp); 1231 G_MIRROR_LOGREQ(2, bp, "Releasing delayed request (%p).", bp); 1232 mtx_lock(&sc->sc_queue_mtx); 1233 bioq_insert_head(&sc->sc_queue, bp); 1234#if 0 1235 /* 1236 * wakeup() is not needed, because this function is called from 1237 * the worker thread. 1238 */ 1239 wakeup(&sc->sc_queue); 1240#endif 1241 mtx_unlock(&sc->sc_queue_mtx); 1242 } 1243} 1244 1245/* 1246 * Releases delayed sync requests which don't collide anymore with regular 1247 * requests. 1248 */ 1249static void 1250g_mirror_sync_release(struct g_mirror_softc *sc) 1251{ 1252 struct bio *bp, *bp2; 1253 1254 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) { 1255 if (g_mirror_regular_collision(sc, bp)) 1256 continue; 1257 bioq_remove(&sc->sc_sync_delayed, bp); 1258 G_MIRROR_LOGREQ(2, bp, 1259 "Releasing delayed synchronization request."); 1260 g_io_request(bp, bp->bio_from); 1261 } 1262} 1263 1264/* 1265 * Handle synchronization requests. 1266 * Every synchronization request is two-steps process: first, READ request is 1267 * send to active provider and then WRITE request (with read data) to the provider 1268 * beeing synchronized. When WRITE is finished, new synchronization request is 1269 * send. 1270 */ 1271static void 1272g_mirror_sync_request(struct bio *bp) 1273{ 1274 struct g_mirror_softc *sc; 1275 struct g_mirror_disk *disk; 1276 1277 bp->bio_from->index--; 1278 sc = bp->bio_from->geom->softc; 1279 disk = bp->bio_from->private; 1280 if (disk == NULL) { 1281 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 1282 g_topology_lock(); 1283 g_mirror_kill_consumer(sc, bp->bio_from); 1284 g_topology_unlock(); 1285 free(bp->bio_data, M_MIRROR); 1286 g_destroy_bio(bp); 1287 sx_xlock(&sc->sc_lock); 1288 return; 1289 } 1290 1291 /* 1292 * Synchronization request. 1293 */ 1294 switch (bp->bio_cmd) { 1295 case BIO_READ: 1296 { 1297 struct g_consumer *cp; 1298 1299 if (bp->bio_error != 0) { 1300 G_MIRROR_LOGREQ(0, bp, 1301 "Synchronization request failed (error=%d).", 1302 bp->bio_error); 1303 g_destroy_bio(bp); 1304 return; 1305 } 1306 G_MIRROR_LOGREQ(3, bp, 1307 "Synchronization request half-finished."); 1308 bp->bio_cmd = BIO_WRITE; 1309 bp->bio_cflags = 0; 1310 cp = disk->d_consumer; 1311 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1312 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1313 cp->acr, cp->acw, cp->ace)); 1314 cp->index++; 1315 g_io_request(bp, cp); 1316 return; 1317 } 1318 case BIO_WRITE: 1319 { 1320 struct g_mirror_disk_sync *sync; 1321 off_t offset; 1322 void *data; 1323 int i; 1324 1325 if (bp->bio_error != 0) { 1326 G_MIRROR_LOGREQ(0, bp, 1327 "Synchronization request failed (error=%d).", 1328 bp->bio_error); 1329 g_destroy_bio(bp); 1330 sc->sc_bump_id |= G_MIRROR_BUMP_GENID; 1331 g_mirror_event_send(disk, 1332 G_MIRROR_DISK_STATE_DISCONNECTED, 1333 G_MIRROR_EVENT_DONTWAIT); 1334 return; 1335 } 1336 G_MIRROR_LOGREQ(3, bp, "Synchronization request finished."); 1337 sync = &disk->d_sync; 1338 if (sync->ds_offset >= sc->sc_mediasize || 1339 sync->ds_consumer == NULL || 1340 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1341 /* Don't send more synchronization requests. */ 1342 sync->ds_inflight--; 1343 if (sync->ds_bios != NULL) { 1344 i = (int)(uintptr_t)bp->bio_caller1; 1345 sync->ds_bios[i] = NULL; 1346 } 1347 free(bp->bio_data, M_MIRROR); 1348 g_destroy_bio(bp); 1349 if (sync->ds_inflight > 0) 1350 return; 1351 if (sync->ds_consumer == NULL || 1352 (sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1353 return; 1354 } 1355 /* Disk up-to-date, activate it. */ 1356 g_mirror_event_send(disk, G_MIRROR_DISK_STATE_ACTIVE, 1357 G_MIRROR_EVENT_DONTWAIT); 1358 return; 1359 } 1360 1361 /* Send next synchronization request. */ 1362 data = bp->bio_data; 1363 bzero(bp, sizeof(*bp)); 1364 bp->bio_cmd = BIO_READ; 1365 bp->bio_offset = sync->ds_offset; 1366 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1367 sync->ds_offset += bp->bio_length; 1368 bp->bio_done = g_mirror_sync_done; 1369 bp->bio_data = data; 1370 bp->bio_from = sync->ds_consumer; 1371 bp->bio_to = sc->sc_provider; 1372 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1373 sync->ds_consumer->index++; 1374 /* 1375 * Delay the request if it is colliding with a regular request. 1376 */ 1377 if (g_mirror_regular_collision(sc, bp)) 1378 g_mirror_sync_delay(sc, bp); 1379 else 1380 g_io_request(bp, sync->ds_consumer); 1381 1382 /* Release delayed requests if possible. */ 1383 g_mirror_regular_release(sc); 1384 1385 /* Find the smallest offset */ 1386 offset = sc->sc_mediasize; 1387 for (i = 0; i < g_mirror_syncreqs; i++) { 1388 bp = sync->ds_bios[i]; 1389 if (bp->bio_offset < offset) 1390 offset = bp->bio_offset; 1391 } 1392 if (sync->ds_offset_done + (MAXPHYS * 100) < offset) { 1393 /* Update offset_done on every 100 blocks. */ 1394 sync->ds_offset_done = offset; 1395 g_mirror_update_metadata(disk); 1396 } 1397 return; 1398 } 1399 default: 1400 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1401 bp->bio_cmd, sc->sc_name)); 1402 break; 1403 } 1404} 1405 1406static void 1407g_mirror_request_prefer(struct g_mirror_softc *sc, struct bio *bp) 1408{ 1409 struct g_mirror_disk *disk; 1410 struct g_consumer *cp; 1411 struct bio *cbp; 1412 1413 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1414 if (disk->d_state == G_MIRROR_DISK_STATE_ACTIVE) 1415 break; 1416 } 1417 if (disk == NULL) { 1418 if (bp->bio_error == 0) 1419 bp->bio_error = ENXIO; 1420 g_io_deliver(bp, bp->bio_error); 1421 return; 1422 } 1423 cbp = g_clone_bio(bp); 1424 if (cbp == NULL) { 1425 if (bp->bio_error == 0) 1426 bp->bio_error = ENOMEM; 1427 g_io_deliver(bp, bp->bio_error); 1428 return; 1429 } 1430 /* 1431 * Fill in the component buf structure. 1432 */ 1433 cp = disk->d_consumer; 1434 cbp->bio_done = g_mirror_done; 1435 cbp->bio_to = cp->provider; 1436 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1437 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1438 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1439 cp->acw, cp->ace)); 1440 cp->index++; 1441 g_io_request(cbp, cp); 1442} 1443 1444static void 1445g_mirror_request_round_robin(struct g_mirror_softc *sc, struct bio *bp) 1446{ 1447 struct g_mirror_disk *disk; 1448 struct g_consumer *cp; 1449 struct bio *cbp; 1450 1451 disk = g_mirror_get_disk(sc); 1452 if (disk == NULL) { 1453 if (bp->bio_error == 0) 1454 bp->bio_error = ENXIO; 1455 g_io_deliver(bp, bp->bio_error); 1456 return; 1457 } 1458 cbp = g_clone_bio(bp); 1459 if (cbp == NULL) { 1460 if (bp->bio_error == 0) 1461 bp->bio_error = ENOMEM; 1462 g_io_deliver(bp, bp->bio_error); 1463 return; 1464 } 1465 /* 1466 * Fill in the component buf structure. 1467 */ 1468 cp = disk->d_consumer; 1469 cbp->bio_done = g_mirror_done; 1470 cbp->bio_to = cp->provider; 1471 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1472 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1473 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1474 cp->acw, cp->ace)); 1475 cp->index++; 1476 g_io_request(cbp, cp); 1477} 1478 1479#define TRACK_SIZE (1 * 1024 * 1024) 1480#define LOAD_SCALE 256 1481#define ABS(x) (((x) >= 0) ? (x) : (-(x))) 1482 1483static void 1484g_mirror_request_load(struct g_mirror_softc *sc, struct bio *bp) 1485{ 1486 struct g_mirror_disk *disk, *dp; 1487 struct g_consumer *cp; 1488 struct bio *cbp; 1489 int prio, best; 1490 1491 /* Find a disk with the smallest load. */ 1492 disk = NULL; 1493 best = INT_MAX; 1494 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1495 if (dp->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1496 continue; 1497 prio = dp->load; 1498 /* If disk head is precisely in position - highly prefer it. */ 1499 if (dp->d_last_offset == bp->bio_offset) 1500 prio -= 2 * LOAD_SCALE; 1501 else 1502 /* If disk head is close to position - prefer it. */ 1503 if (ABS(dp->d_last_offset - bp->bio_offset) < TRACK_SIZE) 1504 prio -= 1 * LOAD_SCALE; 1505 if (prio <= best) { 1506 disk = dp; 1507 best = prio; 1508 } 1509 } 1510 KASSERT(disk != NULL, ("NULL disk for %s.", sc->sc_name)); 1511 cbp = g_clone_bio(bp); 1512 if (cbp == NULL) { 1513 if (bp->bio_error == 0) 1514 bp->bio_error = ENOMEM; 1515 g_io_deliver(bp, bp->bio_error); 1516 return; 1517 } 1518 /* 1519 * Fill in the component buf structure. 1520 */ 1521 cp = disk->d_consumer; 1522 cbp->bio_done = g_mirror_done; 1523 cbp->bio_to = cp->provider; 1524 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1525 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1526 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, cp->acr, 1527 cp->acw, cp->ace)); 1528 cp->index++; 1529 /* Remember last head position */ 1530 disk->d_last_offset = bp->bio_offset + bp->bio_length; 1531 /* Update loads. */ 1532 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 1533 dp->load = (dp->d_consumer->index * LOAD_SCALE + 1534 dp->load * 7) / 8; 1535 } 1536 g_io_request(cbp, cp); 1537} 1538 1539static void 1540g_mirror_request_split(struct g_mirror_softc *sc, struct bio *bp) 1541{ 1542 struct bio_queue_head queue; 1543 struct g_mirror_disk *disk; 1544 struct g_consumer *cp; 1545 struct bio *cbp; 1546 off_t left, mod, offset, slice; 1547 u_char *data; 1548 u_int ndisks; 1549 1550 if (bp->bio_length <= sc->sc_slice) { 1551 g_mirror_request_round_robin(sc, bp); 1552 return; 1553 } 1554 ndisks = g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE); 1555 slice = bp->bio_length / ndisks; 1556 mod = slice % sc->sc_provider->sectorsize; 1557 if (mod != 0) 1558 slice += sc->sc_provider->sectorsize - mod; 1559 /* 1560 * Allocate all bios before sending any request, so we can 1561 * return ENOMEM in nice and clean way. 1562 */ 1563 left = bp->bio_length; 1564 offset = bp->bio_offset; 1565 data = bp->bio_data; 1566 bioq_init(&queue); 1567 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1568 if (disk->d_state != G_MIRROR_DISK_STATE_ACTIVE) 1569 continue; 1570 cbp = g_clone_bio(bp); 1571 if (cbp == NULL) { 1572 while ((cbp = bioq_takefirst(&queue)) != NULL) 1573 bioq_remove(&queue, cbp); 1574 if (bp->bio_error == 0) 1575 bp->bio_error = ENOMEM; 1576 g_io_deliver(bp, bp->bio_error); 1577 return; 1578 } 1579 bioq_insert_tail(&queue, cbp); 1580 cbp->bio_done = g_mirror_done; 1581 cbp->bio_caller1 = disk; 1582 cbp->bio_to = disk->d_consumer->provider; 1583 cbp->bio_offset = offset; 1584 cbp->bio_data = data; 1585 cbp->bio_length = MIN(left, slice); 1586 left -= cbp->bio_length; 1587 if (left == 0) 1588 break; 1589 offset += cbp->bio_length; 1590 data += cbp->bio_length; 1591 } 1592 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1593 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1594 disk = cbp->bio_caller1; 1595 cbp->bio_caller1 = NULL; 1596 cp = disk->d_consumer; 1597 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1598 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name, 1599 cp->acr, cp->acw, cp->ace)); 1600 disk->d_consumer->index++; 1601 g_io_request(cbp, disk->d_consumer); 1602 } 1603} 1604 1605static void 1606g_mirror_register_request(struct bio *bp) 1607{ 1608 struct g_mirror_softc *sc; 1609 1610 sc = bp->bio_to->geom->softc; 1611 switch (bp->bio_cmd) { 1612 case BIO_READ: 1613 switch (sc->sc_balance) { 1614 case G_MIRROR_BALANCE_LOAD: 1615 g_mirror_request_load(sc, bp); 1616 break; 1617 case G_MIRROR_BALANCE_PREFER: 1618 g_mirror_request_prefer(sc, bp); 1619 break; 1620 case G_MIRROR_BALANCE_ROUND_ROBIN: 1621 g_mirror_request_round_robin(sc, bp); 1622 break; 1623 case G_MIRROR_BALANCE_SPLIT: 1624 g_mirror_request_split(sc, bp); 1625 break; 1626 } 1627 return; 1628 case BIO_WRITE: 1629 case BIO_DELETE: 1630 { 1631 struct g_mirror_disk *disk; 1632 struct g_mirror_disk_sync *sync; 1633 struct bio_queue_head queue; 1634 struct g_consumer *cp; 1635 struct bio *cbp; 1636 1637 /* 1638 * Delay the request if it is colliding with a synchronization 1639 * request. 1640 */ 1641 if (g_mirror_sync_collision(sc, bp)) { 1642 g_mirror_regular_delay(sc, bp); 1643 return; 1644 } 1645 1646 if (sc->sc_idle) 1647 g_mirror_unidle(sc); 1648 else 1649 sc->sc_last_write = time_uptime; 1650 1651 /* 1652 * Allocate all bios before sending any request, so we can 1653 * return ENOMEM in nice and clean way. 1654 */ 1655 bioq_init(&queue); 1656 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 1657 sync = &disk->d_sync; 1658 switch (disk->d_state) { 1659 case G_MIRROR_DISK_STATE_ACTIVE: 1660 break; 1661 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 1662 if (bp->bio_offset >= sync->ds_offset) 1663 continue; 1664 break; 1665 default: 1666 continue; 1667 } 1668 if (bp->bio_cmd == BIO_DELETE && 1669 (disk->d_flags & G_MIRROR_DISK_FLAG_CANDELETE) == 0) 1670 continue; 1671 cbp = g_clone_bio(bp); 1672 if (cbp == NULL) { 1673 while ((cbp = bioq_takefirst(&queue)) != NULL) 1674 g_destroy_bio(cbp); 1675 if (bp->bio_error == 0) 1676 bp->bio_error = ENOMEM; 1677 g_io_deliver(bp, bp->bio_error); 1678 return; 1679 } 1680 bioq_insert_tail(&queue, cbp); 1681 cbp->bio_done = g_mirror_done; 1682 cp = disk->d_consumer; 1683 cbp->bio_caller1 = cp; 1684 cbp->bio_to = cp->provider; 1685 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1, 1686 ("Consumer %s not opened (r%dw%de%d).", 1687 cp->provider->name, cp->acr, cp->acw, cp->ace)); 1688 } 1689 while ((cbp = bioq_takefirst(&queue)) != NULL) { 1690 G_MIRROR_LOGREQ(3, cbp, "Sending request."); 1691 cp = cbp->bio_caller1; 1692 cbp->bio_caller1 = NULL; 1693 cp->index++; 1694 sc->sc_writes++; 1695 g_io_request(cbp, cp); 1696 } 1697 /* 1698 * Put request onto inflight queue, so we can check if new 1699 * synchronization requests don't collide with it. 1700 */ 1701 bioq_insert_tail(&sc->sc_inflight, bp); 1702 /* 1703 * Bump syncid on first write. 1704 */ 1705 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) { 1706 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 1707 g_mirror_bump_syncid(sc); 1708 } 1709 return; 1710 } 1711 default: 1712 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)", 1713 bp->bio_cmd, sc->sc_name)); 1714 break; 1715 } 1716} 1717 1718static int 1719g_mirror_can_destroy(struct g_mirror_softc *sc) 1720{ 1721 struct g_geom *gp; 1722 struct g_consumer *cp; 1723 1724 g_topology_assert(); 1725 gp = sc->sc_geom; 1726 if (gp->softc == NULL) 1727 return (1); 1728 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_TASTING) != 0) 1729 return (0); 1730 LIST_FOREACH(cp, &gp->consumer, consumer) { 1731 if (g_mirror_is_busy(sc, cp)) 1732 return (0); 1733 } 1734 gp = sc->sc_sync.ds_geom; 1735 LIST_FOREACH(cp, &gp->consumer, consumer) { 1736 if (g_mirror_is_busy(sc, cp)) 1737 return (0); 1738 } 1739 G_MIRROR_DEBUG(2, "No I/O requests for %s, it can be destroyed.", 1740 sc->sc_name); 1741 return (1); 1742} 1743 1744static int 1745g_mirror_try_destroy(struct g_mirror_softc *sc) 1746{ 1747 1748 if (sc->sc_rootmount != NULL) { 1749 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 1750 sc->sc_rootmount); 1751 root_mount_rel(sc->sc_rootmount); 1752 sc->sc_rootmount = NULL; 1753 } 1754 g_topology_lock(); 1755 if (!g_mirror_can_destroy(sc)) { 1756 g_topology_unlock(); 1757 return (0); 1758 } 1759 sc->sc_geom->softc = NULL; 1760 sc->sc_sync.ds_geom->softc = NULL; 1761 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_WAIT) != 0) { 1762 g_topology_unlock(); 1763 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1764 &sc->sc_worker); 1765 /* Unlock sc_lock here, as it can be destroyed after wakeup. */ 1766 sx_xunlock(&sc->sc_lock); 1767 wakeup(&sc->sc_worker); 1768 sc->sc_worker = NULL; 1769 } else { 1770 g_topology_unlock(); 1771 g_mirror_destroy_device(sc); 1772 free(sc, M_MIRROR); 1773 } 1774 return (1); 1775} 1776 1777/* 1778 * Worker thread. 1779 */ 1780static void 1781g_mirror_worker(void *arg) 1782{ 1783 struct g_mirror_softc *sc; 1784 struct g_mirror_event *ep; 1785 struct bio *bp; 1786 int timeout; 1787 1788 sc = arg; 1789 thread_lock(curthread); 1790 sched_prio(curthread, PRIBIO); 1791 thread_unlock(curthread); 1792 1793 sx_xlock(&sc->sc_lock); 1794 for (;;) { 1795 G_MIRROR_DEBUG(5, "%s: Let's see...", __func__); 1796 /* 1797 * First take a look at events. 1798 * This is important to handle events before any I/O requests. 1799 */ 1800 ep = g_mirror_event_get(sc); 1801 if (ep != NULL) { 1802 g_mirror_event_remove(sc, ep); 1803 if ((ep->e_flags & G_MIRROR_EVENT_DEVICE) != 0) { 1804 /* Update only device status. */ 1805 G_MIRROR_DEBUG(3, 1806 "Running event for device %s.", 1807 sc->sc_name); 1808 ep->e_error = 0; 1809 g_mirror_update_device(sc, 1); 1810 } else { 1811 /* Update disk status. */ 1812 G_MIRROR_DEBUG(3, "Running event for disk %s.", 1813 g_mirror_get_diskname(ep->e_disk)); 1814 ep->e_error = g_mirror_update_disk(ep->e_disk, 1815 ep->e_state); 1816 if (ep->e_error == 0) 1817 g_mirror_update_device(sc, 0); 1818 } 1819 if ((ep->e_flags & G_MIRROR_EVENT_DONTWAIT) != 0) { 1820 KASSERT(ep->e_error == 0, 1821 ("Error cannot be handled.")); 1822 g_mirror_event_free(ep); 1823 } else { 1824 ep->e_flags |= G_MIRROR_EVENT_DONE; 1825 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, 1826 ep); 1827 mtx_lock(&sc->sc_events_mtx); 1828 wakeup(ep); 1829 mtx_unlock(&sc->sc_events_mtx); 1830 } 1831 if ((sc->sc_flags & 1832 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1833 if (g_mirror_try_destroy(sc)) { 1834 curthread->td_pflags &= ~TDP_GEOM; 1835 G_MIRROR_DEBUG(1, "Thread exiting."); 1836 kproc_exit(0); 1837 } 1838 } 1839 G_MIRROR_DEBUG(5, "%s: I'm here 1.", __func__); 1840 continue; 1841 } 1842 /* 1843 * Check if we can mark array as CLEAN and if we can't take 1844 * how much seconds should we wait. 1845 */ 1846 timeout = g_mirror_idle(sc, -1); 1847 /* 1848 * Now I/O requests. 1849 */ 1850 /* Get first request from the queue. */ 1851 mtx_lock(&sc->sc_queue_mtx); 1852 bp = bioq_first(&sc->sc_queue); 1853 if (bp == NULL) { 1854 if ((sc->sc_flags & 1855 G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 1856 mtx_unlock(&sc->sc_queue_mtx); 1857 if (g_mirror_try_destroy(sc)) { 1858 curthread->td_pflags &= ~TDP_GEOM; 1859 G_MIRROR_DEBUG(1, "Thread exiting."); 1860 kproc_exit(0); 1861 } 1862 mtx_lock(&sc->sc_queue_mtx); 1863 } 1864 sx_xunlock(&sc->sc_lock); 1865 /* 1866 * XXX: We can miss an event here, because an event 1867 * can be added without sx-device-lock and without 1868 * mtx-queue-lock. Maybe I should just stop using 1869 * dedicated mutex for events synchronization and 1870 * stick with the queue lock? 1871 * The event will hang here until next I/O request 1872 * or next event is received. 1873 */ 1874 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "m:w1", 1875 timeout * hz); 1876 sx_xlock(&sc->sc_lock); 1877 G_MIRROR_DEBUG(5, "%s: I'm here 4.", __func__); 1878 continue; 1879 } 1880 bioq_remove(&sc->sc_queue, bp); 1881 mtx_unlock(&sc->sc_queue_mtx); 1882 1883 if (bp->bio_from->geom == sc->sc_sync.ds_geom && 1884 (bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) { 1885 g_mirror_sync_request(bp); /* READ */ 1886 } else if (bp->bio_to != sc->sc_provider) { 1887 if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_REGULAR) != 0) 1888 g_mirror_regular_request(bp); 1889 else if ((bp->bio_cflags & G_MIRROR_BIO_FLAG_SYNC) != 0) 1890 g_mirror_sync_request(bp); /* WRITE */ 1891 else { 1892 KASSERT(0, 1893 ("Invalid request cflags=0x%hhx to=%s.", 1894 bp->bio_cflags, bp->bio_to->name)); 1895 } 1896 } else { 1897 g_mirror_register_request(bp); 1898 } 1899 G_MIRROR_DEBUG(5, "%s: I'm here 9.", __func__); 1900 } 1901} 1902 1903static void 1904g_mirror_update_idle(struct g_mirror_softc *sc, struct g_mirror_disk *disk) 1905{ 1906 1907 sx_assert(&sc->sc_lock, SX_LOCKED); 1908 1909 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) != 0) 1910 return; 1911 if (!sc->sc_idle && (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) == 0) { 1912 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as dirty.", 1913 g_mirror_get_diskname(disk), sc->sc_name); 1914 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1915 } else if (sc->sc_idle && 1916 (disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 1917 G_MIRROR_DEBUG(1, "Disk %s (device %s) marked as clean.", 1918 g_mirror_get_diskname(disk), sc->sc_name); 1919 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 1920 } 1921} 1922 1923static void 1924g_mirror_sync_start(struct g_mirror_disk *disk) 1925{ 1926 struct g_mirror_softc *sc; 1927 struct g_consumer *cp; 1928 struct bio *bp; 1929 int error, i; 1930 1931 g_topology_assert_not(); 1932 sc = disk->d_softc; 1933 sx_assert(&sc->sc_lock, SX_LOCKED); 1934 1935 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 1936 ("Disk %s is not marked for synchronization.", 1937 g_mirror_get_diskname(disk))); 1938 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 1939 ("Device not in RUNNING state (%s, %u).", sc->sc_name, 1940 sc->sc_state)); 1941 1942 sx_xunlock(&sc->sc_lock); 1943 g_topology_lock(); 1944 cp = g_new_consumer(sc->sc_sync.ds_geom); 1945 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 1946 error = g_attach(cp, sc->sc_provider); 1947 KASSERT(error == 0, 1948 ("Cannot attach to %s (error=%d).", sc->sc_name, error)); 1949 error = g_access(cp, 1, 0, 0); 1950 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error)); 1951 g_topology_unlock(); 1952 sx_xlock(&sc->sc_lock); 1953 1954 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name, 1955 g_mirror_get_diskname(disk)); 1956 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOFAILSYNC) == 0) 1957 disk->d_flags |= G_MIRROR_DISK_FLAG_DIRTY; 1958 KASSERT(disk->d_sync.ds_consumer == NULL, 1959 ("Sync consumer already exists (device=%s, disk=%s).", 1960 sc->sc_name, g_mirror_get_diskname(disk))); 1961 1962 disk->d_sync.ds_consumer = cp; 1963 disk->d_sync.ds_consumer->private = disk; 1964 disk->d_sync.ds_consumer->index = 0; 1965 1966 /* 1967 * Allocate memory for synchronization bios and initialize them. 1968 */ 1969 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_mirror_syncreqs, 1970 M_MIRROR, M_WAITOK); 1971 for (i = 0; i < g_mirror_syncreqs; i++) { 1972 bp = g_alloc_bio(); 1973 disk->d_sync.ds_bios[i] = bp; 1974 bp->bio_parent = NULL; 1975 bp->bio_cmd = BIO_READ; 1976 bp->bio_data = malloc(MAXPHYS, M_MIRROR, M_WAITOK); 1977 bp->bio_cflags = 0; 1978 bp->bio_offset = disk->d_sync.ds_offset; 1979 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset); 1980 disk->d_sync.ds_offset += bp->bio_length; 1981 bp->bio_done = g_mirror_sync_done; 1982 bp->bio_from = disk->d_sync.ds_consumer; 1983 bp->bio_to = sc->sc_provider; 1984 bp->bio_caller1 = (void *)(uintptr_t)i; 1985 } 1986 1987 /* Increase the number of disks in SYNCHRONIZING state. */ 1988 sc->sc_sync.ds_ndisks++; 1989 /* Set the number of in-flight synchronization requests. */ 1990 disk->d_sync.ds_inflight = g_mirror_syncreqs; 1991 1992 /* 1993 * Fire off first synchronization requests. 1994 */ 1995 for (i = 0; i < g_mirror_syncreqs; i++) { 1996 bp = disk->d_sync.ds_bios[i]; 1997 G_MIRROR_LOGREQ(3, bp, "Sending synchronization request."); 1998 disk->d_sync.ds_consumer->index++; 1999 /* 2000 * Delay the request if it is colliding with a regular request. 2001 */ 2002 if (g_mirror_regular_collision(sc, bp)) 2003 g_mirror_sync_delay(sc, bp); 2004 else 2005 g_io_request(bp, disk->d_sync.ds_consumer); 2006 } 2007} 2008 2009/* 2010 * Stop synchronization process. 2011 * type: 0 - synchronization finished 2012 * 1 - synchronization stopped 2013 */ 2014static void 2015g_mirror_sync_stop(struct g_mirror_disk *disk, int type) 2016{ 2017 struct g_mirror_softc *sc; 2018 struct g_consumer *cp; 2019 2020 g_topology_assert_not(); 2021 sc = disk->d_softc; 2022 sx_assert(&sc->sc_lock, SX_LOCKED); 2023 2024 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2025 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2026 g_mirror_disk_state2str(disk->d_state))); 2027 if (disk->d_sync.ds_consumer == NULL) 2028 return; 2029 2030 if (type == 0) { 2031 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s finished.", 2032 sc->sc_name, g_mirror_get_diskname(disk)); 2033 } else /* if (type == 1) */ { 2034 G_MIRROR_DEBUG(0, "Device %s: rebuilding provider %s stopped.", 2035 sc->sc_name, g_mirror_get_diskname(disk)); 2036 } 2037 free(disk->d_sync.ds_bios, M_MIRROR); 2038 disk->d_sync.ds_bios = NULL; 2039 cp = disk->d_sync.ds_consumer; 2040 disk->d_sync.ds_consumer = NULL; 2041 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2042 sc->sc_sync.ds_ndisks--; 2043 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */ 2044 g_topology_lock(); 2045 g_mirror_kill_consumer(sc, cp); 2046 g_topology_unlock(); 2047 sx_xlock(&sc->sc_lock); 2048} 2049 2050static void 2051g_mirror_launch_provider(struct g_mirror_softc *sc) 2052{ 2053 struct g_mirror_disk *disk; 2054 struct g_provider *pp, *dp; 2055 2056 sx_assert(&sc->sc_lock, SX_LOCKED); 2057 2058 g_topology_lock(); 2059 pp = g_new_providerf(sc->sc_geom, "mirror/%s", sc->sc_name); 2060 pp->flags |= G_PF_DIRECT_RECEIVE; 2061 pp->mediasize = sc->sc_mediasize; 2062 pp->sectorsize = sc->sc_sectorsize; 2063 pp->stripesize = 0; 2064 pp->stripeoffset = 0; 2065 2066 /* Splitting of unmapped BIO's could work but isn't implemented now */ 2067 if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT) 2068 pp->flags |= G_PF_ACCEPT_UNMAPPED; 2069 2070 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2071 if (disk->d_consumer && disk->d_consumer->provider) { 2072 dp = disk->d_consumer->provider; 2073 if (dp->stripesize > pp->stripesize) { 2074 pp->stripesize = dp->stripesize; 2075 pp->stripeoffset = dp->stripeoffset; 2076 } 2077 /* A provider underneath us doesn't support unmapped */ 2078 if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) { 2079 G_MIRROR_DEBUG(0, "Cancelling unmapped " 2080 "because of %s.", dp->name); 2081 pp->flags &= ~G_PF_ACCEPT_UNMAPPED; 2082 } 2083 } 2084 } 2085 sc->sc_provider = pp; 2086 g_error_provider(pp, 0); 2087 g_topology_unlock(); 2088 G_MIRROR_DEBUG(0, "Device %s launched (%u/%u).", pp->name, 2089 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE), sc->sc_ndisks); 2090 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2091 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2092 g_mirror_sync_start(disk); 2093 } 2094} 2095 2096static void 2097g_mirror_destroy_provider(struct g_mirror_softc *sc) 2098{ 2099 struct g_mirror_disk *disk; 2100 struct bio *bp; 2101 2102 g_topology_assert_not(); 2103 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).", 2104 sc->sc_name)); 2105 2106 g_topology_lock(); 2107 g_error_provider(sc->sc_provider, ENXIO); 2108 mtx_lock(&sc->sc_queue_mtx); 2109 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) 2110 g_io_deliver(bp, ENXIO); 2111 mtx_unlock(&sc->sc_queue_mtx); 2112 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name, 2113 sc->sc_provider->name); 2114 sc->sc_provider->flags |= G_PF_WITHER; 2115 g_orphan_provider(sc->sc_provider, ENXIO); 2116 g_topology_unlock(); 2117 sc->sc_provider = NULL; 2118 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2119 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) 2120 g_mirror_sync_stop(disk, 1); 2121 } 2122} 2123 2124static void 2125g_mirror_go(void *arg) 2126{ 2127 struct g_mirror_softc *sc; 2128 2129 sc = arg; 2130 G_MIRROR_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name); 2131 g_mirror_event_send(sc, 0, 2132 G_MIRROR_EVENT_DONTWAIT | G_MIRROR_EVENT_DEVICE); 2133} 2134 2135static u_int 2136g_mirror_determine_state(struct g_mirror_disk *disk) 2137{ 2138 struct g_mirror_softc *sc; 2139 u_int state; 2140 2141 sc = disk->d_softc; 2142 if (sc->sc_syncid == disk->d_sync.ds_syncid) { 2143 if ((disk->d_flags & 2144 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2145 /* Disk does not need synchronization. */ 2146 state = G_MIRROR_DISK_STATE_ACTIVE; 2147 } else { 2148 if ((sc->sc_flags & 2149 G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2150 (disk->d_flags & 2151 G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2152 /* 2153 * We can start synchronization from 2154 * the stored offset. 2155 */ 2156 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2157 } else { 2158 state = G_MIRROR_DISK_STATE_STALE; 2159 } 2160 } 2161 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) { 2162 /* 2163 * Reset all synchronization data for this disk, 2164 * because if it even was synchronized, it was 2165 * synchronized to disks with different syncid. 2166 */ 2167 disk->d_flags |= G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2168 disk->d_sync.ds_offset = 0; 2169 disk->d_sync.ds_offset_done = 0; 2170 disk->d_sync.ds_syncid = sc->sc_syncid; 2171 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) == 0 || 2172 (disk->d_flags & G_MIRROR_DISK_FLAG_FORCE_SYNC) != 0) { 2173 state = G_MIRROR_DISK_STATE_SYNCHRONIZING; 2174 } else { 2175 state = G_MIRROR_DISK_STATE_STALE; 2176 } 2177 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ { 2178 /* 2179 * Not good, NOT GOOD! 2180 * It means that mirror was started on stale disks 2181 * and more fresh disk just arrive. 2182 * If there were writes, mirror is broken, sorry. 2183 * I think the best choice here is don't touch 2184 * this disk and inform the user loudly. 2185 */ 2186 G_MIRROR_DEBUG(0, "Device %s was started before the freshest " 2187 "disk (%s) arrives!! It will not be connected to the " 2188 "running device.", sc->sc_name, 2189 g_mirror_get_diskname(disk)); 2190 g_mirror_destroy_disk(disk); 2191 state = G_MIRROR_DISK_STATE_NONE; 2192 /* Return immediately, because disk was destroyed. */ 2193 return (state); 2194 } 2195 G_MIRROR_DEBUG(3, "State for %s disk: %s.", 2196 g_mirror_get_diskname(disk), g_mirror_disk_state2str(state)); 2197 return (state); 2198} 2199 2200/* 2201 * Update device state. 2202 */ 2203static void 2204g_mirror_update_device(struct g_mirror_softc *sc, boolean_t force) 2205{ 2206 struct g_mirror_disk *disk; 2207 u_int state; 2208 2209 sx_assert(&sc->sc_lock, SX_XLOCKED); 2210 2211 switch (sc->sc_state) { 2212 case G_MIRROR_DEVICE_STATE_STARTING: 2213 { 2214 struct g_mirror_disk *pdisk, *tdisk; 2215 u_int dirty, ndisks, genid, syncid; 2216 2217 KASSERT(sc->sc_provider == NULL, 2218 ("Non-NULL provider in STARTING state (%s).", sc->sc_name)); 2219 /* 2220 * Are we ready? We are, if all disks are connected or 2221 * if we have any disks and 'force' is true. 2222 */ 2223 ndisks = g_mirror_ndisks(sc, -1); 2224 if (sc->sc_ndisks == ndisks || (force && ndisks > 0)) { 2225 ; 2226 } else if (ndisks == 0) { 2227 /* 2228 * Disks went down in starting phase, so destroy 2229 * device. 2230 */ 2231 callout_drain(&sc->sc_callout); 2232 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2233 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", __LINE__, 2234 sc->sc_rootmount); 2235 root_mount_rel(sc->sc_rootmount); 2236 sc->sc_rootmount = NULL; 2237 return; 2238 } else { 2239 return; 2240 } 2241 2242 /* 2243 * Activate all disks with the biggest syncid. 2244 */ 2245 if (force) { 2246 /* 2247 * If 'force' is true, we have been called due to 2248 * timeout, so don't bother canceling timeout. 2249 */ 2250 ndisks = 0; 2251 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2252 if ((disk->d_flags & 2253 G_MIRROR_DISK_FLAG_SYNCHRONIZING) == 0) { 2254 ndisks++; 2255 } 2256 } 2257 if (ndisks == 0) { 2258 /* No valid disks found, destroy device. */ 2259 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2260 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2261 __LINE__, sc->sc_rootmount); 2262 root_mount_rel(sc->sc_rootmount); 2263 sc->sc_rootmount = NULL; 2264 return; 2265 } 2266 } else { 2267 /* Cancel timeout. */ 2268 callout_drain(&sc->sc_callout); 2269 } 2270 2271 /* 2272 * Find the biggest genid. 2273 */ 2274 genid = 0; 2275 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2276 if (disk->d_genid > genid) 2277 genid = disk->d_genid; 2278 } 2279 sc->sc_genid = genid; 2280 /* 2281 * Remove all disks without the biggest genid. 2282 */ 2283 LIST_FOREACH_SAFE(disk, &sc->sc_disks, d_next, tdisk) { 2284 if (disk->d_genid < genid) { 2285 G_MIRROR_DEBUG(0, 2286 "Component %s (device %s) broken, skipping.", 2287 g_mirror_get_diskname(disk), sc->sc_name); 2288 g_mirror_destroy_disk(disk); 2289 } 2290 } 2291 2292 /* 2293 * Find the biggest syncid. 2294 */ 2295 syncid = 0; 2296 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2297 if (disk->d_sync.ds_syncid > syncid) 2298 syncid = disk->d_sync.ds_syncid; 2299 } 2300 2301 /* 2302 * Here we need to look for dirty disks and if all disks 2303 * with the biggest syncid are dirty, we have to choose 2304 * one with the biggest priority and rebuild the rest. 2305 */ 2306 /* 2307 * Find the number of dirty disks with the biggest syncid. 2308 * Find the number of disks with the biggest syncid. 2309 * While here, find a disk with the biggest priority. 2310 */ 2311 dirty = ndisks = 0; 2312 pdisk = NULL; 2313 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2314 if (disk->d_sync.ds_syncid != syncid) 2315 continue; 2316 if ((disk->d_flags & 2317 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2318 continue; 2319 } 2320 ndisks++; 2321 if ((disk->d_flags & G_MIRROR_DISK_FLAG_DIRTY) != 0) { 2322 dirty++; 2323 if (pdisk == NULL || 2324 pdisk->d_priority < disk->d_priority) { 2325 pdisk = disk; 2326 } 2327 } 2328 } 2329 if (dirty == 0) { 2330 /* No dirty disks at all, great. */ 2331 } else if (dirty == ndisks) { 2332 /* 2333 * Force synchronization for all dirty disks except one 2334 * with the biggest priority. 2335 */ 2336 KASSERT(pdisk != NULL, ("pdisk == NULL")); 2337 G_MIRROR_DEBUG(1, "Using disk %s (device %s) as a " 2338 "master disk for synchronization.", 2339 g_mirror_get_diskname(pdisk), sc->sc_name); 2340 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2341 if (disk->d_sync.ds_syncid != syncid) 2342 continue; 2343 if ((disk->d_flags & 2344 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2345 continue; 2346 } 2347 KASSERT((disk->d_flags & 2348 G_MIRROR_DISK_FLAG_DIRTY) != 0, 2349 ("Disk %s isn't marked as dirty.", 2350 g_mirror_get_diskname(disk))); 2351 /* Skip the disk with the biggest priority. */ 2352 if (disk == pdisk) 2353 continue; 2354 disk->d_sync.ds_syncid = 0; 2355 } 2356 } else if (dirty < ndisks) { 2357 /* 2358 * Force synchronization for all dirty disks. 2359 * We have some non-dirty disks. 2360 */ 2361 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2362 if (disk->d_sync.ds_syncid != syncid) 2363 continue; 2364 if ((disk->d_flags & 2365 G_MIRROR_DISK_FLAG_SYNCHRONIZING) != 0) { 2366 continue; 2367 } 2368 if ((disk->d_flags & 2369 G_MIRROR_DISK_FLAG_DIRTY) == 0) { 2370 continue; 2371 } 2372 disk->d_sync.ds_syncid = 0; 2373 } 2374 } 2375 2376 /* Reset hint. */ 2377 sc->sc_hint = NULL; 2378 sc->sc_syncid = syncid; 2379 if (force) { 2380 /* Remember to bump syncid on first write. */ 2381 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2382 } 2383 state = G_MIRROR_DEVICE_STATE_RUNNING; 2384 G_MIRROR_DEBUG(1, "Device %s state changed from %s to %s.", 2385 sc->sc_name, g_mirror_device_state2str(sc->sc_state), 2386 g_mirror_device_state2str(state)); 2387 sc->sc_state = state; 2388 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2389 state = g_mirror_determine_state(disk); 2390 g_mirror_event_send(disk, state, 2391 G_MIRROR_EVENT_DONTWAIT); 2392 if (state == G_MIRROR_DISK_STATE_STALE) 2393 sc->sc_bump_id |= G_MIRROR_BUMP_SYNCID; 2394 } 2395 break; 2396 } 2397 case G_MIRROR_DEVICE_STATE_RUNNING: 2398 if (g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE) == 0 && 2399 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2400 /* 2401 * No active disks or no disks at all, 2402 * so destroy device. 2403 */ 2404 if (sc->sc_provider != NULL) 2405 g_mirror_destroy_provider(sc); 2406 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 2407 break; 2408 } else if (g_mirror_ndisks(sc, 2409 G_MIRROR_DISK_STATE_ACTIVE) > 0 && 2410 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_NEW) == 0) { 2411 /* 2412 * We have active disks, launch provider if it doesn't 2413 * exist. 2414 */ 2415 if (sc->sc_provider == NULL) 2416 g_mirror_launch_provider(sc); 2417 if (sc->sc_rootmount != NULL) { 2418 G_MIRROR_DEBUG(1, "root_mount_rel[%u] %p", 2419 __LINE__, sc->sc_rootmount); 2420 root_mount_rel(sc->sc_rootmount); 2421 sc->sc_rootmount = NULL; 2422 } 2423 } 2424 /* 2425 * Genid should be bumped immediately, so do it here. 2426 */ 2427 if ((sc->sc_bump_id & G_MIRROR_BUMP_GENID) != 0) { 2428 sc->sc_bump_id &= ~G_MIRROR_BUMP_GENID; 2429 g_mirror_bump_genid(sc); 2430 } 2431 break; 2432 default: 2433 KASSERT(1 == 0, ("Wrong device state (%s, %s).", 2434 sc->sc_name, g_mirror_device_state2str(sc->sc_state))); 2435 break; 2436 } 2437} 2438 2439/* 2440 * Update disk state and device state if needed. 2441 */ 2442#define DISK_STATE_CHANGED() G_MIRROR_DEBUG(1, \ 2443 "Disk %s state changed from %s to %s (device %s).", \ 2444 g_mirror_get_diskname(disk), \ 2445 g_mirror_disk_state2str(disk->d_state), \ 2446 g_mirror_disk_state2str(state), sc->sc_name) 2447static int 2448g_mirror_update_disk(struct g_mirror_disk *disk, u_int state) 2449{ 2450 struct g_mirror_softc *sc; 2451 2452 sc = disk->d_softc; 2453 sx_assert(&sc->sc_lock, SX_XLOCKED); 2454 2455again: 2456 G_MIRROR_DEBUG(3, "Changing disk %s state from %s to %s.", 2457 g_mirror_get_diskname(disk), g_mirror_disk_state2str(disk->d_state), 2458 g_mirror_disk_state2str(state)); 2459 switch (state) { 2460 case G_MIRROR_DISK_STATE_NEW: 2461 /* 2462 * Possible scenarios: 2463 * 1. New disk arrive. 2464 */ 2465 /* Previous state should be NONE. */ 2466 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NONE, 2467 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2468 g_mirror_disk_state2str(disk->d_state))); 2469 DISK_STATE_CHANGED(); 2470 2471 disk->d_state = state; 2472 if (LIST_EMPTY(&sc->sc_disks)) 2473 LIST_INSERT_HEAD(&sc->sc_disks, disk, d_next); 2474 else { 2475 struct g_mirror_disk *dp; 2476 2477 LIST_FOREACH(dp, &sc->sc_disks, d_next) { 2478 if (disk->d_priority >= dp->d_priority) { 2479 LIST_INSERT_BEFORE(dp, disk, d_next); 2480 dp = NULL; 2481 break; 2482 } 2483 if (LIST_NEXT(dp, d_next) == NULL) 2484 break; 2485 } 2486 if (dp != NULL) 2487 LIST_INSERT_AFTER(dp, disk, d_next); 2488 } 2489 G_MIRROR_DEBUG(1, "Device %s: provider %s detected.", 2490 sc->sc_name, g_mirror_get_diskname(disk)); 2491 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 2492 break; 2493 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2494 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2495 g_mirror_device_state2str(sc->sc_state), 2496 g_mirror_get_diskname(disk), 2497 g_mirror_disk_state2str(disk->d_state))); 2498 state = g_mirror_determine_state(disk); 2499 if (state != G_MIRROR_DISK_STATE_NONE) 2500 goto again; 2501 break; 2502 case G_MIRROR_DISK_STATE_ACTIVE: 2503 /* 2504 * Possible scenarios: 2505 * 1. New disk does not need synchronization. 2506 * 2. Synchronization process finished successfully. 2507 */ 2508 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2509 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2510 g_mirror_device_state2str(sc->sc_state), 2511 g_mirror_get_diskname(disk), 2512 g_mirror_disk_state2str(disk->d_state))); 2513 /* Previous state should be NEW or SYNCHRONIZING. */ 2514 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW || 2515 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2516 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2517 g_mirror_disk_state2str(disk->d_state))); 2518 DISK_STATE_CHANGED(); 2519 2520 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2521 disk->d_flags &= ~G_MIRROR_DISK_FLAG_SYNCHRONIZING; 2522 disk->d_flags &= ~G_MIRROR_DISK_FLAG_FORCE_SYNC; 2523 g_mirror_sync_stop(disk, 0); 2524 } 2525 disk->d_state = state; 2526 disk->d_sync.ds_offset = 0; 2527 disk->d_sync.ds_offset_done = 0; 2528 g_mirror_update_idle(sc, disk); 2529 g_mirror_update_metadata(disk); 2530 G_MIRROR_DEBUG(1, "Device %s: provider %s activated.", 2531 sc->sc_name, g_mirror_get_diskname(disk)); 2532 break; 2533 case G_MIRROR_DISK_STATE_STALE: 2534 /* 2535 * Possible scenarios: 2536 * 1. Stale disk was connected. 2537 */ 2538 /* Previous state should be NEW. */ 2539 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2540 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2541 g_mirror_disk_state2str(disk->d_state))); 2542 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2543 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2544 g_mirror_device_state2str(sc->sc_state), 2545 g_mirror_get_diskname(disk), 2546 g_mirror_disk_state2str(disk->d_state))); 2547 /* 2548 * STALE state is only possible if device is marked 2549 * NOAUTOSYNC. 2550 */ 2551 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_NOAUTOSYNC) != 0, 2552 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2553 g_mirror_device_state2str(sc->sc_state), 2554 g_mirror_get_diskname(disk), 2555 g_mirror_disk_state2str(disk->d_state))); 2556 DISK_STATE_CHANGED(); 2557 2558 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2559 disk->d_state = state; 2560 g_mirror_update_metadata(disk); 2561 G_MIRROR_DEBUG(0, "Device %s: provider %s is stale.", 2562 sc->sc_name, g_mirror_get_diskname(disk)); 2563 break; 2564 case G_MIRROR_DISK_STATE_SYNCHRONIZING: 2565 /* 2566 * Possible scenarios: 2567 * 1. Disk which needs synchronization was connected. 2568 */ 2569 /* Previous state should be NEW. */ 2570 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2571 ("Wrong disk state (%s, %s).", g_mirror_get_diskname(disk), 2572 g_mirror_disk_state2str(disk->d_state))); 2573 KASSERT(sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING, 2574 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name, 2575 g_mirror_device_state2str(sc->sc_state), 2576 g_mirror_get_diskname(disk), 2577 g_mirror_disk_state2str(disk->d_state))); 2578 DISK_STATE_CHANGED(); 2579 2580 if (disk->d_state == G_MIRROR_DISK_STATE_NEW) 2581 disk->d_flags &= ~G_MIRROR_DISK_FLAG_DIRTY; 2582 disk->d_state = state; 2583 if (sc->sc_provider != NULL) { 2584 g_mirror_sync_start(disk); 2585 g_mirror_update_metadata(disk); 2586 } 2587 break; 2588 case G_MIRROR_DISK_STATE_DISCONNECTED: 2589 /* 2590 * Possible scenarios: 2591 * 1. Device wasn't running yet, but disk disappear. 2592 * 2. Disk was active and disapppear. 2593 * 3. Disk disappear during synchronization process. 2594 */ 2595 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING) { 2596 /* 2597 * Previous state should be ACTIVE, STALE or 2598 * SYNCHRONIZING. 2599 */ 2600 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_ACTIVE || 2601 disk->d_state == G_MIRROR_DISK_STATE_STALE || 2602 disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING, 2603 ("Wrong disk state (%s, %s).", 2604 g_mirror_get_diskname(disk), 2605 g_mirror_disk_state2str(disk->d_state))); 2606 } else if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) { 2607 /* Previous state should be NEW. */ 2608 KASSERT(disk->d_state == G_MIRROR_DISK_STATE_NEW, 2609 ("Wrong disk state (%s, %s).", 2610 g_mirror_get_diskname(disk), 2611 g_mirror_disk_state2str(disk->d_state))); 2612 /* 2613 * Reset bumping syncid if disk disappeared in STARTING 2614 * state. 2615 */ 2616 if ((sc->sc_bump_id & G_MIRROR_BUMP_SYNCID) != 0) 2617 sc->sc_bump_id &= ~G_MIRROR_BUMP_SYNCID; 2618#ifdef INVARIANTS 2619 } else { 2620 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).", 2621 sc->sc_name, 2622 g_mirror_device_state2str(sc->sc_state), 2623 g_mirror_get_diskname(disk), 2624 g_mirror_disk_state2str(disk->d_state))); 2625#endif 2626 } 2627 DISK_STATE_CHANGED(); 2628 G_MIRROR_DEBUG(0, "Device %s: provider %s disconnected.", 2629 sc->sc_name, g_mirror_get_diskname(disk)); 2630 2631 g_mirror_destroy_disk(disk); 2632 break; 2633 case G_MIRROR_DISK_STATE_DESTROY: 2634 { 2635 int error; 2636 2637 error = g_mirror_clear_metadata(disk); 2638 if (error != 0) 2639 return (error); 2640 DISK_STATE_CHANGED(); 2641 G_MIRROR_DEBUG(0, "Device %s: provider %s destroyed.", 2642 sc->sc_name, g_mirror_get_diskname(disk)); 2643 2644 g_mirror_destroy_disk(disk); 2645 sc->sc_ndisks--; 2646 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2647 g_mirror_update_metadata(disk); 2648 } 2649 break; 2650 } 2651 default: 2652 KASSERT(1 == 0, ("Unknown state (%u).", state)); 2653 break; 2654 } 2655 return (0); 2656} 2657#undef DISK_STATE_CHANGED 2658 2659int 2660g_mirror_read_metadata(struct g_consumer *cp, struct g_mirror_metadata *md) 2661{ 2662 struct g_provider *pp; 2663 u_char *buf; 2664 int error; 2665 2666 g_topology_assert(); 2667 2668 error = g_access(cp, 1, 0, 0); 2669 if (error != 0) 2670 return (error); 2671 pp = cp->provider; 2672 g_topology_unlock(); 2673 /* Metadata are stored on last sector. */ 2674 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 2675 &error); 2676 g_topology_lock(); 2677 g_access(cp, -1, 0, 0); 2678 if (buf == NULL) { 2679 G_MIRROR_DEBUG(1, "Cannot read metadata from %s (error=%d).", 2680 cp->provider->name, error); 2681 return (error); 2682 } 2683 2684 /* Decode metadata. */ 2685 error = mirror_metadata_decode(buf, md); 2686 g_free(buf); 2687 if (strcmp(md->md_magic, G_MIRROR_MAGIC) != 0) 2688 return (EINVAL); 2689 if (md->md_version > G_MIRROR_VERSION) { 2690 G_MIRROR_DEBUG(0, 2691 "Kernel module is too old to handle metadata from %s.", 2692 cp->provider->name); 2693 return (EINVAL); 2694 } 2695 if (error != 0) { 2696 G_MIRROR_DEBUG(1, "MD5 metadata hash mismatch for provider %s.", 2697 cp->provider->name); 2698 return (error); 2699 } 2700 2701 return (0); 2702} 2703 2704static int 2705g_mirror_check_metadata(struct g_mirror_softc *sc, struct g_provider *pp, 2706 struct g_mirror_metadata *md) 2707{ 2708 2709 if (g_mirror_id2disk(sc, md->md_did) != NULL) { 2710 G_MIRROR_DEBUG(1, "Disk %s (id=%u) already exists, skipping.", 2711 pp->name, md->md_did); 2712 return (EEXIST); 2713 } 2714 if (md->md_all != sc->sc_ndisks) { 2715 G_MIRROR_DEBUG(1, 2716 "Invalid '%s' field on disk %s (device %s), skipping.", 2717 "md_all", pp->name, sc->sc_name); 2718 return (EINVAL); 2719 } 2720 if (md->md_slice != sc->sc_slice) { 2721 G_MIRROR_DEBUG(1, 2722 "Invalid '%s' field on disk %s (device %s), skipping.", 2723 "md_slice", pp->name, sc->sc_name); 2724 return (EINVAL); 2725 } 2726 if (md->md_balance != sc->sc_balance) { 2727 G_MIRROR_DEBUG(1, 2728 "Invalid '%s' field on disk %s (device %s), skipping.", 2729 "md_balance", pp->name, sc->sc_name); 2730 return (EINVAL); 2731 } 2732#if 0 2733 if (md->md_mediasize != sc->sc_mediasize) { 2734 G_MIRROR_DEBUG(1, 2735 "Invalid '%s' field on disk %s (device %s), skipping.", 2736 "md_mediasize", pp->name, sc->sc_name); 2737 return (EINVAL); 2738 } 2739#endif 2740 if (sc->sc_mediasize > pp->mediasize) { 2741 G_MIRROR_DEBUG(1, 2742 "Invalid size of disk %s (device %s), skipping.", pp->name, 2743 sc->sc_name); 2744 return (EINVAL); 2745 } 2746 if (md->md_sectorsize != sc->sc_sectorsize) { 2747 G_MIRROR_DEBUG(1, 2748 "Invalid '%s' field on disk %s (device %s), skipping.", 2749 "md_sectorsize", pp->name, sc->sc_name); 2750 return (EINVAL); 2751 } 2752 if ((sc->sc_sectorsize % pp->sectorsize) != 0) { 2753 G_MIRROR_DEBUG(1, 2754 "Invalid sector size of disk %s (device %s), skipping.", 2755 pp->name, sc->sc_name); 2756 return (EINVAL); 2757 } 2758 if ((md->md_mflags & ~G_MIRROR_DEVICE_FLAG_MASK) != 0) { 2759 G_MIRROR_DEBUG(1, 2760 "Invalid device flags on disk %s (device %s), skipping.", 2761 pp->name, sc->sc_name); 2762 return (EINVAL); 2763 } 2764 if ((md->md_dflags & ~G_MIRROR_DISK_FLAG_MASK) != 0) { 2765 G_MIRROR_DEBUG(1, 2766 "Invalid disk flags on disk %s (device %s), skipping.", 2767 pp->name, sc->sc_name); 2768 return (EINVAL); 2769 } 2770 return (0); 2771} 2772 2773int 2774g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp, 2775 struct g_mirror_metadata *md) 2776{ 2777 struct g_mirror_disk *disk; 2778 int error; 2779 2780 g_topology_assert_not(); 2781 G_MIRROR_DEBUG(2, "Adding disk %s.", pp->name); 2782 2783 error = g_mirror_check_metadata(sc, pp, md); 2784 if (error != 0) 2785 return (error); 2786 if (sc->sc_state == G_MIRROR_DEVICE_STATE_RUNNING && 2787 md->md_genid < sc->sc_genid) { 2788 G_MIRROR_DEBUG(0, "Component %s (device %s) broken, skipping.", 2789 pp->name, sc->sc_name); 2790 return (EINVAL); 2791 } 2792 disk = g_mirror_init_disk(sc, pp, md, &error); 2793 if (disk == NULL) 2794 return (error); 2795 error = g_mirror_event_send(disk, G_MIRROR_DISK_STATE_NEW, 2796 G_MIRROR_EVENT_WAIT); 2797 if (error != 0) 2798 return (error); 2799 if (md->md_version < G_MIRROR_VERSION) { 2800 G_MIRROR_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).", 2801 pp->name, md->md_version, G_MIRROR_VERSION); 2802 g_mirror_update_metadata(disk); 2803 } 2804 return (0); 2805} 2806 2807static void 2808g_mirror_destroy_delayed(void *arg, int flag) 2809{ 2810 struct g_mirror_softc *sc; 2811 int error; 2812 2813 if (flag == EV_CANCEL) { 2814 G_MIRROR_DEBUG(1, "Destroying canceled."); 2815 return; 2816 } 2817 sc = arg; 2818 g_topology_unlock(); 2819 sx_xlock(&sc->sc_lock); 2820 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) == 0, 2821 ("DESTROY flag set on %s.", sc->sc_name)); 2822 KASSERT((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0, 2823 ("DESTROYING flag not set on %s.", sc->sc_name)); 2824 G_MIRROR_DEBUG(1, "Destroying %s (delayed).", sc->sc_name); 2825 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_SOFT); 2826 if (error != 0) { 2827 G_MIRROR_DEBUG(0, "Cannot destroy %s.", sc->sc_name); 2828 sx_xunlock(&sc->sc_lock); 2829 } 2830 g_topology_lock(); 2831} 2832 2833static int 2834g_mirror_access(struct g_provider *pp, int acr, int acw, int ace) 2835{ 2836 struct g_mirror_softc *sc; 2837 int dcr, dcw, dce, error = 0; 2838 2839 g_topology_assert(); 2840 G_MIRROR_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr, 2841 acw, ace); 2842 2843 sc = pp->geom->softc; 2844 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0) 2845 return (0); 2846 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name)); 2847 2848 dcr = pp->acr + acr; 2849 dcw = pp->acw + acw; 2850 dce = pp->ace + ace; 2851 2852 g_topology_unlock(); 2853 sx_xlock(&sc->sc_lock); 2854 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0 || 2855 LIST_EMPTY(&sc->sc_disks)) { 2856 if (acr > 0 || acw > 0 || ace > 0) 2857 error = ENXIO; 2858 goto end; 2859 } 2860 if (dcw == 0) 2861 g_mirror_idle(sc, dcw); 2862 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROYING) != 0) { 2863 if (acr > 0 || acw > 0 || ace > 0) { 2864 error = ENXIO; 2865 goto end; 2866 } 2867 if (dcr == 0 && dcw == 0 && dce == 0) { 2868 g_post_event(g_mirror_destroy_delayed, sc, M_WAITOK, 2869 sc, NULL); 2870 } 2871 } 2872end: 2873 sx_xunlock(&sc->sc_lock); 2874 g_topology_lock(); 2875 return (error); 2876} 2877 2878static struct g_geom * 2879g_mirror_create(struct g_class *mp, const struct g_mirror_metadata *md) 2880{ 2881 struct g_mirror_softc *sc; 2882 struct g_geom *gp; 2883 int error, timeout; 2884 2885 g_topology_assert(); 2886 G_MIRROR_DEBUG(1, "Creating device %s (id=%u).", md->md_name, 2887 md->md_mid); 2888 2889 /* One disk is minimum. */ 2890 if (md->md_all < 1) 2891 return (NULL); 2892 /* 2893 * Action geom. 2894 */ 2895 gp = g_new_geomf(mp, "%s", md->md_name); 2896 sc = malloc(sizeof(*sc), M_MIRROR, M_WAITOK | M_ZERO); 2897 gp->start = g_mirror_start; 2898 gp->orphan = g_mirror_orphan; 2899 gp->access = g_mirror_access; 2900 gp->dumpconf = g_mirror_dumpconf; 2901 2902 sc->sc_id = md->md_mid; 2903 sc->sc_slice = md->md_slice; 2904 sc->sc_balance = md->md_balance; 2905 sc->sc_mediasize = md->md_mediasize; 2906 sc->sc_sectorsize = md->md_sectorsize; 2907 sc->sc_ndisks = md->md_all; 2908 sc->sc_flags = md->md_mflags; 2909 sc->sc_bump_id = 0; 2910 sc->sc_idle = 1; 2911 sc->sc_last_write = time_uptime; 2912 sc->sc_writes = 0; 2913 sx_init(&sc->sc_lock, "gmirror:lock"); 2914 bioq_init(&sc->sc_queue); 2915 mtx_init(&sc->sc_queue_mtx, "gmirror:queue", NULL, MTX_DEF); 2916 bioq_init(&sc->sc_regular_delayed); 2917 bioq_init(&sc->sc_inflight); 2918 bioq_init(&sc->sc_sync_delayed); 2919 LIST_INIT(&sc->sc_disks); 2920 TAILQ_INIT(&sc->sc_events); 2921 mtx_init(&sc->sc_events_mtx, "gmirror:events", NULL, MTX_DEF); 2922 callout_init(&sc->sc_callout, CALLOUT_MPSAFE); 2923 mtx_init(&sc->sc_done_mtx, "gmirror:done", NULL, MTX_DEF); 2924 sc->sc_state = G_MIRROR_DEVICE_STATE_STARTING; 2925 gp->softc = sc; 2926 sc->sc_geom = gp; 2927 sc->sc_provider = NULL; 2928 /* 2929 * Synchronization geom. 2930 */ 2931 gp = g_new_geomf(mp, "%s.sync", md->md_name); 2932 gp->softc = sc; 2933 gp->orphan = g_mirror_orphan; 2934 sc->sc_sync.ds_geom = gp; 2935 sc->sc_sync.ds_ndisks = 0; 2936 error = kproc_create(g_mirror_worker, sc, &sc->sc_worker, 0, 0, 2937 "g_mirror %s", md->md_name); 2938 if (error != 0) { 2939 G_MIRROR_DEBUG(1, "Cannot create kernel thread for %s.", 2940 sc->sc_name); 2941 g_destroy_geom(sc->sc_sync.ds_geom); 2942 mtx_destroy(&sc->sc_done_mtx); 2943 mtx_destroy(&sc->sc_events_mtx); 2944 mtx_destroy(&sc->sc_queue_mtx); 2945 sx_destroy(&sc->sc_lock); 2946 g_destroy_geom(sc->sc_geom); 2947 free(sc, M_MIRROR); 2948 return (NULL); 2949 } 2950 2951 G_MIRROR_DEBUG(1, "Device %s created (%u components, id=%u).", 2952 sc->sc_name, sc->sc_ndisks, sc->sc_id); 2953 2954 sc->sc_rootmount = root_mount_hold("GMIRROR"); 2955 G_MIRROR_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount); 2956 /* 2957 * Run timeout. 2958 */ 2959 timeout = g_mirror_timeout * hz; 2960 callout_reset(&sc->sc_callout, timeout, g_mirror_go, sc); 2961 return (sc->sc_geom); 2962} 2963 2964int 2965g_mirror_destroy(struct g_mirror_softc *sc, int how) 2966{ 2967 struct g_mirror_disk *disk; 2968 struct g_provider *pp; 2969 2970 g_topology_assert_not(); 2971 if (sc == NULL) 2972 return (ENXIO); 2973 sx_assert(&sc->sc_lock, SX_XLOCKED); 2974 2975 pp = sc->sc_provider; 2976 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 2977 switch (how) { 2978 case G_MIRROR_DESTROY_SOFT: 2979 G_MIRROR_DEBUG(1, 2980 "Device %s is still open (r%dw%de%d).", pp->name, 2981 pp->acr, pp->acw, pp->ace); 2982 return (EBUSY); 2983 case G_MIRROR_DESTROY_DELAYED: 2984 G_MIRROR_DEBUG(1, 2985 "Device %s will be destroyed on last close.", 2986 pp->name); 2987 LIST_FOREACH(disk, &sc->sc_disks, d_next) { 2988 if (disk->d_state == 2989 G_MIRROR_DISK_STATE_SYNCHRONIZING) { 2990 g_mirror_sync_stop(disk, 1); 2991 } 2992 } 2993 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROYING; 2994 return (EBUSY); 2995 case G_MIRROR_DESTROY_HARD: 2996 G_MIRROR_DEBUG(1, "Device %s is still open, so it " 2997 "can't be definitely removed.", pp->name); 2998 } 2999 } 3000 3001 g_topology_lock(); 3002 if (sc->sc_geom->softc == NULL) { 3003 g_topology_unlock(); 3004 return (0); 3005 } 3006 sc->sc_geom->softc = NULL; 3007 sc->sc_sync.ds_geom->softc = NULL; 3008 g_topology_unlock(); 3009 3010 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; 3011 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; 3012 G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc); 3013 sx_xunlock(&sc->sc_lock); 3014 mtx_lock(&sc->sc_queue_mtx); 3015 wakeup(sc); 3016 mtx_unlock(&sc->sc_queue_mtx); 3017 G_MIRROR_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker); 3018 while (sc->sc_worker != NULL) 3019 tsleep(&sc->sc_worker, PRIBIO, "m:destroy", hz / 5); 3020 G_MIRROR_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker); 3021 sx_xlock(&sc->sc_lock); 3022 g_mirror_destroy_device(sc); 3023 free(sc, M_MIRROR); 3024 return (0); 3025} 3026 3027static void 3028g_mirror_taste_orphan(struct g_consumer *cp) 3029{ 3030 3031 KASSERT(1 == 0, ("%s called while tasting %s.", __func__, 3032 cp->provider->name)); 3033} 3034 3035static struct g_geom * 3036g_mirror_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 3037{ 3038 struct g_mirror_metadata md; 3039 struct g_mirror_softc *sc; 3040 struct g_consumer *cp; 3041 struct g_geom *gp; 3042 int error; 3043 3044 g_topology_assert(); 3045 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 3046 G_MIRROR_DEBUG(2, "Tasting %s.", pp->name); 3047 3048 gp = g_new_geomf(mp, "mirror:taste"); 3049 /* 3050 * This orphan function should be never called. 3051 */ 3052 gp->orphan = g_mirror_taste_orphan; 3053 cp = g_new_consumer(gp); 3054 g_attach(cp, pp); 3055 error = g_mirror_read_metadata(cp, &md); 3056 g_detach(cp); 3057 g_destroy_consumer(cp); 3058 g_destroy_geom(gp); 3059 if (error != 0) 3060 return (NULL); 3061 gp = NULL; 3062 3063 if (md.md_provider[0] != '\0' && 3064 !g_compare_names(md.md_provider, pp->name)) 3065 return (NULL); 3066 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize) 3067 return (NULL); 3068 if ((md.md_dflags & G_MIRROR_DISK_FLAG_INACTIVE) != 0) { 3069 G_MIRROR_DEBUG(0, 3070 "Device %s: provider %s marked as inactive, skipping.", 3071 md.md_name, pp->name); 3072 return (NULL); 3073 } 3074 if (g_mirror_debug >= 2) 3075 mirror_metadata_dump(&md); 3076 3077 /* 3078 * Let's check if device already exists. 3079 */ 3080 sc = NULL; 3081 LIST_FOREACH(gp, &mp->geom, geom) { 3082 sc = gp->softc; 3083 if (sc == NULL) 3084 continue; 3085 if (sc->sc_sync.ds_geom == gp) 3086 continue; 3087 if (strcmp(md.md_name, sc->sc_name) != 0) 3088 continue; 3089 if (md.md_mid != sc->sc_id) { 3090 G_MIRROR_DEBUG(0, "Device %s already configured.", 3091 sc->sc_name); 3092 return (NULL); 3093 } 3094 break; 3095 } 3096 if (gp == NULL) { 3097 gp = g_mirror_create(mp, &md); 3098 if (gp == NULL) { 3099 G_MIRROR_DEBUG(0, "Cannot create device %s.", 3100 md.md_name); 3101 return (NULL); 3102 } 3103 sc = gp->softc; 3104 } 3105 G_MIRROR_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name); 3106 g_topology_unlock(); 3107 sx_xlock(&sc->sc_lock); 3108 sc->sc_flags |= G_MIRROR_DEVICE_FLAG_TASTING; 3109 error = g_mirror_add_disk(sc, pp, &md); 3110 if (error != 0) { 3111 G_MIRROR_DEBUG(0, "Cannot add disk %s to %s (error=%d).", 3112 pp->name, gp->name, error); 3113 if (LIST_EMPTY(&sc->sc_disks)) { 3114 g_cancel_event(sc); 3115 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3116 g_topology_lock(); 3117 return (NULL); 3118 } 3119 gp = NULL; 3120 } 3121 sc->sc_flags &= ~G_MIRROR_DEVICE_FLAG_TASTING; 3122 if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) { 3123 g_mirror_destroy(sc, G_MIRROR_DESTROY_HARD); 3124 g_topology_lock(); 3125 return (NULL); 3126 } 3127 sx_xunlock(&sc->sc_lock); 3128 g_topology_lock(); 3129 return (gp); 3130} 3131 3132static void 3133g_mirror_resize(struct g_consumer *cp) 3134{ 3135 struct g_mirror_disk *disk; 3136 3137 g_topology_assert(); 3138 g_trace(G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name); 3139 3140 disk = cp->private; 3141 if (disk == NULL) 3142 return; 3143 g_topology_unlock(); 3144 g_mirror_update_metadata(disk); 3145 g_topology_lock(); 3146} 3147 3148static int 3149g_mirror_destroy_geom(struct gctl_req *req __unused, 3150 struct g_class *mp __unused, struct g_geom *gp) 3151{ 3152 struct g_mirror_softc *sc; 3153 int error; 3154 3155 g_topology_unlock(); 3156 sc = gp->softc; 3157 sx_xlock(&sc->sc_lock); 3158 g_cancel_event(sc); 3159 error = g_mirror_destroy(gp->softc, G_MIRROR_DESTROY_SOFT); 3160 if (error != 0) 3161 sx_xunlock(&sc->sc_lock); 3162 g_topology_lock(); 3163 return (error); 3164} 3165 3166static void 3167g_mirror_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 3168 struct g_consumer *cp, struct g_provider *pp) 3169{ 3170 struct g_mirror_softc *sc; 3171 3172 g_topology_assert(); 3173 3174 sc = gp->softc; 3175 if (sc == NULL) 3176 return; 3177 /* Skip synchronization geom. */ 3178 if (gp == sc->sc_sync.ds_geom) 3179 return; 3180 if (pp != NULL) { 3181 /* Nothing here. */ 3182 } else if (cp != NULL) { 3183 struct g_mirror_disk *disk; 3184 3185 disk = cp->private; 3186 if (disk == NULL) 3187 return; 3188 g_topology_unlock(); 3189 sx_xlock(&sc->sc_lock); 3190 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)disk->d_id); 3191 if (disk->d_state == G_MIRROR_DISK_STATE_SYNCHRONIZING) { 3192 sbuf_printf(sb, "%s<Synchronized>", indent); 3193 if (disk->d_sync.ds_offset == 0) 3194 sbuf_printf(sb, "0%%"); 3195 else { 3196 sbuf_printf(sb, "%u%%", 3197 (u_int)((disk->d_sync.ds_offset * 100) / 3198 sc->sc_provider->mediasize)); 3199 } 3200 sbuf_printf(sb, "</Synchronized>\n"); 3201 if (disk->d_sync.ds_offset > 0) { 3202 sbuf_printf(sb, "%s<BytesSynced>%jd" 3203 "</BytesSynced>\n", indent, 3204 (intmax_t)disk->d_sync.ds_offset); 3205 } 3206 } 3207 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, 3208 disk->d_sync.ds_syncid); 3209 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, 3210 disk->d_genid); 3211 sbuf_printf(sb, "%s<Flags>", indent); 3212 if (disk->d_flags == 0) 3213 sbuf_printf(sb, "NONE"); 3214 else { 3215 int first = 1; 3216 3217#define ADD_FLAG(flag, name) do { \ 3218 if ((disk->d_flags & (flag)) != 0) { \ 3219 if (!first) \ 3220 sbuf_printf(sb, ", "); \ 3221 else \ 3222 first = 0; \ 3223 sbuf_printf(sb, name); \ 3224 } \ 3225} while (0) 3226 ADD_FLAG(G_MIRROR_DISK_FLAG_DIRTY, "DIRTY"); 3227 ADD_FLAG(G_MIRROR_DISK_FLAG_HARDCODED, "HARDCODED"); 3228 ADD_FLAG(G_MIRROR_DISK_FLAG_INACTIVE, "INACTIVE"); 3229 ADD_FLAG(G_MIRROR_DISK_FLAG_SYNCHRONIZING, 3230 "SYNCHRONIZING"); 3231 ADD_FLAG(G_MIRROR_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC"); 3232 ADD_FLAG(G_MIRROR_DISK_FLAG_BROKEN, "BROKEN"); 3233#undef ADD_FLAG 3234 } 3235 sbuf_printf(sb, "</Flags>\n"); 3236 sbuf_printf(sb, "%s<Priority>%u</Priority>\n", indent, 3237 disk->d_priority); 3238 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 3239 g_mirror_disk_state2str(disk->d_state)); 3240 sx_xunlock(&sc->sc_lock); 3241 g_topology_lock(); 3242 } else { 3243 g_topology_unlock(); 3244 sx_xlock(&sc->sc_lock); 3245 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id); 3246 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid); 3247 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid); 3248 sbuf_printf(sb, "%s<Flags>", indent); 3249 if (sc->sc_flags == 0) 3250 sbuf_printf(sb, "NONE"); 3251 else { 3252 int first = 1; 3253 3254#define ADD_FLAG(flag, name) do { \ 3255 if ((sc->sc_flags & (flag)) != 0) { \ 3256 if (!first) \ 3257 sbuf_printf(sb, ", "); \ 3258 else \ 3259 first = 0; \ 3260 sbuf_printf(sb, name); \ 3261 } \ 3262} while (0) 3263 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC"); 3264 ADD_FLAG(G_MIRROR_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC"); 3265#undef ADD_FLAG 3266 } 3267 sbuf_printf(sb, "</Flags>\n"); 3268 sbuf_printf(sb, "%s<Slice>%u</Slice>\n", indent, 3269 (u_int)sc->sc_slice); 3270 sbuf_printf(sb, "%s<Balance>%s</Balance>\n", indent, 3271 balance_name(sc->sc_balance)); 3272 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent, 3273 sc->sc_ndisks); 3274 sbuf_printf(sb, "%s<State>", indent); 3275 if (sc->sc_state == G_MIRROR_DEVICE_STATE_STARTING) 3276 sbuf_printf(sb, "%s", "STARTING"); 3277 else if (sc->sc_ndisks == 3278 g_mirror_ndisks(sc, G_MIRROR_DISK_STATE_ACTIVE)) 3279 sbuf_printf(sb, "%s", "COMPLETE"); 3280 else 3281 sbuf_printf(sb, "%s", "DEGRADED"); 3282 sbuf_printf(sb, "</State>\n"); 3283 sx_xunlock(&sc->sc_lock); 3284 g_topology_lock(); 3285 } 3286} 3287 3288static void 3289g_mirror_shutdown_post_sync(void *arg, int howto) 3290{ 3291 struct g_class *mp; 3292 struct g_geom *gp, *gp2; 3293 struct g_mirror_softc *sc; 3294 int error; 3295 3296 mp = arg; 3297 DROP_GIANT(); 3298 g_topology_lock(); 3299 g_mirror_shutdown = 1; 3300 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 3301 if ((sc = gp->softc) == NULL) 3302 continue; 3303 /* Skip synchronization geom. */ 3304 if (gp == sc->sc_sync.ds_geom) 3305 continue; 3306 g_topology_unlock(); 3307 sx_xlock(&sc->sc_lock); 3308 g_mirror_idle(sc, -1); 3309 g_cancel_event(sc); 3310 error = g_mirror_destroy(sc, G_MIRROR_DESTROY_DELAYED); 3311 if (error != 0) 3312 sx_xunlock(&sc->sc_lock); 3313 g_topology_lock(); 3314 } 3315 g_topology_unlock(); 3316 PICKUP_GIANT(); 3317} 3318 3319static void 3320g_mirror_init(struct g_class *mp) 3321{ 3322 3323 g_mirror_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync, 3324 g_mirror_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST); 3325 if (g_mirror_post_sync == NULL) 3326 G_MIRROR_DEBUG(0, "Warning! Cannot register shutdown event."); 3327} 3328 3329static void 3330g_mirror_fini(struct g_class *mp) 3331{ 3332 3333 if (g_mirror_post_sync != NULL) 3334 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_mirror_post_sync); 3335} 3336 3337DECLARE_GEOM_CLASS(g_mirror_class, g_mirror); 3338