1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/limits.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/bio.h>
40 #include <sys/sbuf.h>
41 #include <sys/sysctl.h>
42 #include <sys/malloc.h>
43 #include <sys/eventhandler.h>
44 #include <vm/uma.h>
45 #include <geom/geom.h>
46 #include <sys/proc.h>
47 #include <sys/kthread.h>
48 #include <sys/sched.h>
49 #include <geom/raid3/g_raid3.h>
50
51 FEATURE(geom_raid3, "GEOM RAID-3 functionality");
52
53 static MALLOC_DEFINE(M_RAID3, "raid3_data", "GEOM_RAID3 Data");
54
55 SYSCTL_DECL(_kern_geom);
56 static SYSCTL_NODE(_kern_geom, OID_AUTO, raid3, CTLFLAG_RW, 0,
57 "GEOM_RAID3 stuff");
58 u_int g_raid3_debug = 0;
59 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, debug, CTLFLAG_RWTUN, &g_raid3_debug, 0,
60 "Debug level");
61 static u_int g_raid3_timeout = 4;
62 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_raid3_timeout,
63 0, "Time to wait on all raid3 components");
64 static u_int g_raid3_idletime = 5;
65 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, idletime, CTLFLAG_RWTUN,
66 &g_raid3_idletime, 0, "Mark components as clean when idling");
67 static u_int g_raid3_disconnect_on_failure = 1;
68 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN,
69 &g_raid3_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
70 static u_int g_raid3_syncreqs = 2;
71 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
72 &g_raid3_syncreqs, 0, "Parallel synchronization I/O requests.");
73 static u_int g_raid3_use_malloc = 0;
74 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, use_malloc, CTLFLAG_RDTUN,
75 &g_raid3_use_malloc, 0, "Use malloc(9) instead of uma(9).");
76
77 static u_int g_raid3_n64k = 50;
78 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n64k, CTLFLAG_RDTUN, &g_raid3_n64k, 0,
79 "Maximum number of 64kB allocations");
80 static u_int g_raid3_n16k = 200;
81 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n16k, CTLFLAG_RDTUN, &g_raid3_n16k, 0,
82 "Maximum number of 16kB allocations");
83 static u_int g_raid3_n4k = 1200;
84 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n4k, CTLFLAG_RDTUN, &g_raid3_n4k, 0,
85 "Maximum number of 4kB allocations");
86
87 static SYSCTL_NODE(_kern_geom_raid3, OID_AUTO, stat, CTLFLAG_RW, 0,
88 "GEOM_RAID3 statistics");
89 static u_int g_raid3_parity_mismatch = 0;
90 SYSCTL_UINT(_kern_geom_raid3_stat, OID_AUTO, parity_mismatch, CTLFLAG_RD,
91 &g_raid3_parity_mismatch, 0, "Number of failures in VERIFY mode");
92
93 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
94 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
95 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
96 G_RAID3_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
97 } while (0)
98
99 static eventhandler_tag g_raid3_post_sync = NULL;
100 static int g_raid3_shutdown = 0;
101
102 static int g_raid3_destroy_geom(struct gctl_req *req, struct g_class *mp,
103 struct g_geom *gp);
104 static g_taste_t g_raid3_taste;
105 static void g_raid3_init(struct g_class *mp);
106 static void g_raid3_fini(struct g_class *mp);
107
108 struct g_class g_raid3_class = {
109 .name = G_RAID3_CLASS_NAME,
110 .version = G_VERSION,
111 .ctlreq = g_raid3_config,
112 .taste = g_raid3_taste,
113 .destroy_geom = g_raid3_destroy_geom,
114 .init = g_raid3_init,
115 .fini = g_raid3_fini
116 };
117
118
119 static void g_raid3_destroy_provider(struct g_raid3_softc *sc);
120 static int g_raid3_update_disk(struct g_raid3_disk *disk, u_int state);
121 static void g_raid3_update_device(struct g_raid3_softc *sc, boolean_t force);
122 static void g_raid3_dumpconf(struct sbuf *sb, const char *indent,
123 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
124 static void g_raid3_sync_stop(struct g_raid3_softc *sc, int type);
125 static int g_raid3_register_request(struct bio *pbp);
126 static void g_raid3_sync_release(struct g_raid3_softc *sc);
127
128
129 static const char *
g_raid3_disk_state2str(int state)130 g_raid3_disk_state2str(int state)
131 {
132
133 switch (state) {
134 case G_RAID3_DISK_STATE_NODISK:
135 return ("NODISK");
136 case G_RAID3_DISK_STATE_NONE:
137 return ("NONE");
138 case G_RAID3_DISK_STATE_NEW:
139 return ("NEW");
140 case G_RAID3_DISK_STATE_ACTIVE:
141 return ("ACTIVE");
142 case G_RAID3_DISK_STATE_STALE:
143 return ("STALE");
144 case G_RAID3_DISK_STATE_SYNCHRONIZING:
145 return ("SYNCHRONIZING");
146 case G_RAID3_DISK_STATE_DISCONNECTED:
147 return ("DISCONNECTED");
148 default:
149 return ("INVALID");
150 }
151 }
152
153 static const char *
g_raid3_device_state2str(int state)154 g_raid3_device_state2str(int state)
155 {
156
157 switch (state) {
158 case G_RAID3_DEVICE_STATE_STARTING:
159 return ("STARTING");
160 case G_RAID3_DEVICE_STATE_DEGRADED:
161 return ("DEGRADED");
162 case G_RAID3_DEVICE_STATE_COMPLETE:
163 return ("COMPLETE");
164 default:
165 return ("INVALID");
166 }
167 }
168
169 const char *
g_raid3_get_diskname(struct g_raid3_disk * disk)170 g_raid3_get_diskname(struct g_raid3_disk *disk)
171 {
172
173 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
174 return ("[unknown]");
175 return (disk->d_name);
176 }
177
178 static void *
g_raid3_alloc(struct g_raid3_softc * sc,size_t size,int flags)179 g_raid3_alloc(struct g_raid3_softc *sc, size_t size, int flags)
180 {
181 void *ptr;
182 enum g_raid3_zones zone;
183
184 if (g_raid3_use_malloc ||
185 (zone = g_raid3_zone(size)) == G_RAID3_NUM_ZONES)
186 ptr = malloc(size, M_RAID3, flags);
187 else {
188 ptr = uma_zalloc_arg(sc->sc_zones[zone].sz_zone,
189 &sc->sc_zones[zone], flags);
190 sc->sc_zones[zone].sz_requested++;
191 if (ptr == NULL)
192 sc->sc_zones[zone].sz_failed++;
193 }
194 return (ptr);
195 }
196
197 static void
g_raid3_free(struct g_raid3_softc * sc,void * ptr,size_t size)198 g_raid3_free(struct g_raid3_softc *sc, void *ptr, size_t size)
199 {
200 enum g_raid3_zones zone;
201
202 if (g_raid3_use_malloc ||
203 (zone = g_raid3_zone(size)) == G_RAID3_NUM_ZONES)
204 free(ptr, M_RAID3);
205 else {
206 uma_zfree_arg(sc->sc_zones[zone].sz_zone,
207 ptr, &sc->sc_zones[zone]);
208 }
209 }
210
211 static int
g_raid3_uma_ctor(void * mem,int size,void * arg,int flags)212 g_raid3_uma_ctor(void *mem, int size, void *arg, int flags)
213 {
214 struct g_raid3_zone *sz = arg;
215
216 if (sz->sz_max > 0 && sz->sz_inuse == sz->sz_max)
217 return (ENOMEM);
218 sz->sz_inuse++;
219 return (0);
220 }
221
222 static void
g_raid3_uma_dtor(void * mem,int size,void * arg)223 g_raid3_uma_dtor(void *mem, int size, void *arg)
224 {
225 struct g_raid3_zone *sz = arg;
226
227 sz->sz_inuse--;
228 }
229
230 #define g_raid3_xor(src, dst, size) \
231 _g_raid3_xor((uint64_t *)(src), \
232 (uint64_t *)(dst), (size_t)size)
233 static void
_g_raid3_xor(uint64_t * src,uint64_t * dst,size_t size)234 _g_raid3_xor(uint64_t *src, uint64_t *dst, size_t size)
235 {
236
237 KASSERT((size % 128) == 0, ("Invalid size: %zu.", size));
238 for (; size > 0; size -= 128) {
239 *dst++ ^= (*src++);
240 *dst++ ^= (*src++);
241 *dst++ ^= (*src++);
242 *dst++ ^= (*src++);
243 *dst++ ^= (*src++);
244 *dst++ ^= (*src++);
245 *dst++ ^= (*src++);
246 *dst++ ^= (*src++);
247 *dst++ ^= (*src++);
248 *dst++ ^= (*src++);
249 *dst++ ^= (*src++);
250 *dst++ ^= (*src++);
251 *dst++ ^= (*src++);
252 *dst++ ^= (*src++);
253 *dst++ ^= (*src++);
254 *dst++ ^= (*src++);
255 }
256 }
257
258 static int
g_raid3_is_zero(struct bio * bp)259 g_raid3_is_zero(struct bio *bp)
260 {
261 static const uint64_t zeros[] = {
262 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
263 };
264 u_char *addr;
265 ssize_t size;
266
267 size = bp->bio_length;
268 addr = (u_char *)bp->bio_data;
269 for (; size > 0; size -= sizeof(zeros), addr += sizeof(zeros)) {
270 if (bcmp(addr, zeros, sizeof(zeros)) != 0)
271 return (0);
272 }
273 return (1);
274 }
275
276 /*
277 * --- Events handling functions ---
278 * Events in geom_raid3 are used to maintain disks and device status
279 * from one thread to simplify locking.
280 */
281 static void
g_raid3_event_free(struct g_raid3_event * ep)282 g_raid3_event_free(struct g_raid3_event *ep)
283 {
284
285 free(ep, M_RAID3);
286 }
287
288 int
g_raid3_event_send(void * arg,int state,int flags)289 g_raid3_event_send(void *arg, int state, int flags)
290 {
291 struct g_raid3_softc *sc;
292 struct g_raid3_disk *disk;
293 struct g_raid3_event *ep;
294 int error;
295
296 ep = malloc(sizeof(*ep), M_RAID3, M_WAITOK);
297 G_RAID3_DEBUG(4, "%s: Sending event %p.", __func__, ep);
298 if ((flags & G_RAID3_EVENT_DEVICE) != 0) {
299 disk = NULL;
300 sc = arg;
301 } else {
302 disk = arg;
303 sc = disk->d_softc;
304 }
305 ep->e_disk = disk;
306 ep->e_state = state;
307 ep->e_flags = flags;
308 ep->e_error = 0;
309 mtx_lock(&sc->sc_events_mtx);
310 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
311 mtx_unlock(&sc->sc_events_mtx);
312 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
313 mtx_lock(&sc->sc_queue_mtx);
314 wakeup(sc);
315 wakeup(&sc->sc_queue);
316 mtx_unlock(&sc->sc_queue_mtx);
317 if ((flags & G_RAID3_EVENT_DONTWAIT) != 0)
318 return (0);
319 sx_assert(&sc->sc_lock, SX_XLOCKED);
320 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
321 sx_xunlock(&sc->sc_lock);
322 while ((ep->e_flags & G_RAID3_EVENT_DONE) == 0) {
323 mtx_lock(&sc->sc_events_mtx);
324 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "r3:event",
325 hz * 5);
326 }
327 error = ep->e_error;
328 g_raid3_event_free(ep);
329 sx_xlock(&sc->sc_lock);
330 return (error);
331 }
332
333 static struct g_raid3_event *
g_raid3_event_get(struct g_raid3_softc * sc)334 g_raid3_event_get(struct g_raid3_softc *sc)
335 {
336 struct g_raid3_event *ep;
337
338 mtx_lock(&sc->sc_events_mtx);
339 ep = TAILQ_FIRST(&sc->sc_events);
340 mtx_unlock(&sc->sc_events_mtx);
341 return (ep);
342 }
343
344 static void
g_raid3_event_remove(struct g_raid3_softc * sc,struct g_raid3_event * ep)345 g_raid3_event_remove(struct g_raid3_softc *sc, struct g_raid3_event *ep)
346 {
347
348 mtx_lock(&sc->sc_events_mtx);
349 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
350 mtx_unlock(&sc->sc_events_mtx);
351 }
352
353 static void
g_raid3_event_cancel(struct g_raid3_disk * disk)354 g_raid3_event_cancel(struct g_raid3_disk *disk)
355 {
356 struct g_raid3_softc *sc;
357 struct g_raid3_event *ep, *tmpep;
358
359 sc = disk->d_softc;
360 sx_assert(&sc->sc_lock, SX_XLOCKED);
361
362 mtx_lock(&sc->sc_events_mtx);
363 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
364 if ((ep->e_flags & G_RAID3_EVENT_DEVICE) != 0)
365 continue;
366 if (ep->e_disk != disk)
367 continue;
368 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
369 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0)
370 g_raid3_event_free(ep);
371 else {
372 ep->e_error = ECANCELED;
373 wakeup(ep);
374 }
375 }
376 mtx_unlock(&sc->sc_events_mtx);
377 }
378
379 /*
380 * Return the number of disks in the given state.
381 * If state is equal to -1, count all connected disks.
382 */
383 u_int
g_raid3_ndisks(struct g_raid3_softc * sc,int state)384 g_raid3_ndisks(struct g_raid3_softc *sc, int state)
385 {
386 struct g_raid3_disk *disk;
387 u_int n, ndisks;
388
389 sx_assert(&sc->sc_lock, SX_LOCKED);
390
391 for (n = ndisks = 0; n < sc->sc_ndisks; n++) {
392 disk = &sc->sc_disks[n];
393 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
394 continue;
395 if (state == -1 || disk->d_state == state)
396 ndisks++;
397 }
398 return (ndisks);
399 }
400
401 static u_int
g_raid3_nrequests(struct g_raid3_softc * sc,struct g_consumer * cp)402 g_raid3_nrequests(struct g_raid3_softc *sc, struct g_consumer *cp)
403 {
404 struct bio *bp;
405 u_int nreqs = 0;
406
407 mtx_lock(&sc->sc_queue_mtx);
408 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
409 if (bp->bio_from == cp)
410 nreqs++;
411 }
412 mtx_unlock(&sc->sc_queue_mtx);
413 return (nreqs);
414 }
415
416 static int
g_raid3_is_busy(struct g_raid3_softc * sc,struct g_consumer * cp)417 g_raid3_is_busy(struct g_raid3_softc *sc, struct g_consumer *cp)
418 {
419
420 if (cp->index > 0) {
421 G_RAID3_DEBUG(2,
422 "I/O requests for %s exist, can't destroy it now.",
423 cp->provider->name);
424 return (1);
425 }
426 if (g_raid3_nrequests(sc, cp) > 0) {
427 G_RAID3_DEBUG(2,
428 "I/O requests for %s in queue, can't destroy it now.",
429 cp->provider->name);
430 return (1);
431 }
432 return (0);
433 }
434
435 static void
g_raid3_destroy_consumer(void * arg,int flags __unused)436 g_raid3_destroy_consumer(void *arg, int flags __unused)
437 {
438 struct g_consumer *cp;
439
440 g_topology_assert();
441
442 cp = arg;
443 G_RAID3_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
444 g_detach(cp);
445 g_destroy_consumer(cp);
446 }
447
448 static void
g_raid3_kill_consumer(struct g_raid3_softc * sc,struct g_consumer * cp)449 g_raid3_kill_consumer(struct g_raid3_softc *sc, struct g_consumer *cp)
450 {
451 struct g_provider *pp;
452 int retaste_wait;
453
454 g_topology_assert();
455
456 cp->private = NULL;
457 if (g_raid3_is_busy(sc, cp))
458 return;
459 G_RAID3_DEBUG(2, "Consumer %s destroyed.", cp->provider->name);
460 pp = cp->provider;
461 retaste_wait = 0;
462 if (cp->acw == 1) {
463 if ((pp->geom->flags & G_GEOM_WITHER) == 0)
464 retaste_wait = 1;
465 }
466 G_RAID3_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
467 -cp->acw, -cp->ace, 0);
468 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
469 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
470 if (retaste_wait) {
471 /*
472 * After retaste event was send (inside g_access()), we can send
473 * event to detach and destroy consumer.
474 * A class, which has consumer to the given provider connected
475 * will not receive retaste event for the provider.
476 * This is the way how I ignore retaste events when I close
477 * consumers opened for write: I detach and destroy consumer
478 * after retaste event is sent.
479 */
480 g_post_event(g_raid3_destroy_consumer, cp, M_WAITOK, NULL);
481 return;
482 }
483 G_RAID3_DEBUG(1, "Consumer %s destroyed.", pp->name);
484 g_detach(cp);
485 g_destroy_consumer(cp);
486 }
487
488 static int
g_raid3_connect_disk(struct g_raid3_disk * disk,struct g_provider * pp)489 g_raid3_connect_disk(struct g_raid3_disk *disk, struct g_provider *pp)
490 {
491 struct g_consumer *cp;
492 int error;
493
494 g_topology_assert_not();
495 KASSERT(disk->d_consumer == NULL,
496 ("Disk already connected (device %s).", disk->d_softc->sc_name));
497
498 g_topology_lock();
499 cp = g_new_consumer(disk->d_softc->sc_geom);
500 error = g_attach(cp, pp);
501 if (error != 0) {
502 g_destroy_consumer(cp);
503 g_topology_unlock();
504 return (error);
505 }
506 error = g_access(cp, 1, 1, 1);
507 g_topology_unlock();
508 if (error != 0) {
509 g_detach(cp);
510 g_destroy_consumer(cp);
511 G_RAID3_DEBUG(0, "Cannot open consumer %s (error=%d).",
512 pp->name, error);
513 return (error);
514 }
515 disk->d_consumer = cp;
516 disk->d_consumer->private = disk;
517 disk->d_consumer->index = 0;
518 G_RAID3_DEBUG(2, "Disk %s connected.", g_raid3_get_diskname(disk));
519 return (0);
520 }
521
522 static void
g_raid3_disconnect_consumer(struct g_raid3_softc * sc,struct g_consumer * cp)523 g_raid3_disconnect_consumer(struct g_raid3_softc *sc, struct g_consumer *cp)
524 {
525
526 g_topology_assert();
527
528 if (cp == NULL)
529 return;
530 if (cp->provider != NULL)
531 g_raid3_kill_consumer(sc, cp);
532 else
533 g_destroy_consumer(cp);
534 }
535
536 /*
537 * Initialize disk. This means allocate memory, create consumer, attach it
538 * to the provider and open access (r1w1e1) to it.
539 */
540 static struct g_raid3_disk *
g_raid3_init_disk(struct g_raid3_softc * sc,struct g_provider * pp,struct g_raid3_metadata * md,int * errorp)541 g_raid3_init_disk(struct g_raid3_softc *sc, struct g_provider *pp,
542 struct g_raid3_metadata *md, int *errorp)
543 {
544 struct g_raid3_disk *disk;
545 int error;
546
547 disk = &sc->sc_disks[md->md_no];
548 error = g_raid3_connect_disk(disk, pp);
549 if (error != 0) {
550 if (errorp != NULL)
551 *errorp = error;
552 return (NULL);
553 }
554 disk->d_state = G_RAID3_DISK_STATE_NONE;
555 disk->d_flags = md->md_dflags;
556 if (md->md_provider[0] != '\0')
557 disk->d_flags |= G_RAID3_DISK_FLAG_HARDCODED;
558 disk->d_sync.ds_consumer = NULL;
559 disk->d_sync.ds_offset = md->md_sync_offset;
560 disk->d_sync.ds_offset_done = md->md_sync_offset;
561 disk->d_genid = md->md_genid;
562 disk->d_sync.ds_syncid = md->md_syncid;
563 if (errorp != NULL)
564 *errorp = 0;
565 return (disk);
566 }
567
568 static void
g_raid3_destroy_disk(struct g_raid3_disk * disk)569 g_raid3_destroy_disk(struct g_raid3_disk *disk)
570 {
571 struct g_raid3_softc *sc;
572
573 g_topology_assert_not();
574 sc = disk->d_softc;
575 sx_assert(&sc->sc_lock, SX_XLOCKED);
576
577 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
578 return;
579 g_raid3_event_cancel(disk);
580 switch (disk->d_state) {
581 case G_RAID3_DISK_STATE_SYNCHRONIZING:
582 if (sc->sc_syncdisk != NULL)
583 g_raid3_sync_stop(sc, 1);
584 /* FALLTHROUGH */
585 case G_RAID3_DISK_STATE_NEW:
586 case G_RAID3_DISK_STATE_STALE:
587 case G_RAID3_DISK_STATE_ACTIVE:
588 g_topology_lock();
589 g_raid3_disconnect_consumer(sc, disk->d_consumer);
590 g_topology_unlock();
591 disk->d_consumer = NULL;
592 break;
593 default:
594 KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
595 g_raid3_get_diskname(disk),
596 g_raid3_disk_state2str(disk->d_state)));
597 }
598 disk->d_state = G_RAID3_DISK_STATE_NODISK;
599 }
600
601 static void
g_raid3_destroy_device(struct g_raid3_softc * sc)602 g_raid3_destroy_device(struct g_raid3_softc *sc)
603 {
604 struct g_raid3_event *ep;
605 struct g_raid3_disk *disk;
606 struct g_geom *gp;
607 struct g_consumer *cp;
608 u_int n;
609
610 g_topology_assert_not();
611 sx_assert(&sc->sc_lock, SX_XLOCKED);
612
613 gp = sc->sc_geom;
614 if (sc->sc_provider != NULL)
615 g_raid3_destroy_provider(sc);
616 for (n = 0; n < sc->sc_ndisks; n++) {
617 disk = &sc->sc_disks[n];
618 if (disk->d_state != G_RAID3_DISK_STATE_NODISK) {
619 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
620 g_raid3_update_metadata(disk);
621 g_raid3_destroy_disk(disk);
622 }
623 }
624 while ((ep = g_raid3_event_get(sc)) != NULL) {
625 g_raid3_event_remove(sc, ep);
626 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0)
627 g_raid3_event_free(ep);
628 else {
629 ep->e_error = ECANCELED;
630 ep->e_flags |= G_RAID3_EVENT_DONE;
631 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, ep);
632 mtx_lock(&sc->sc_events_mtx);
633 wakeup(ep);
634 mtx_unlock(&sc->sc_events_mtx);
635 }
636 }
637 callout_drain(&sc->sc_callout);
638 cp = LIST_FIRST(&sc->sc_sync.ds_geom->consumer);
639 g_topology_lock();
640 if (cp != NULL)
641 g_raid3_disconnect_consumer(sc, cp);
642 g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
643 G_RAID3_DEBUG(0, "Device %s destroyed.", gp->name);
644 g_wither_geom(gp, ENXIO);
645 g_topology_unlock();
646 if (!g_raid3_use_malloc) {
647 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_64K].sz_zone);
648 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_16K].sz_zone);
649 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_4K].sz_zone);
650 }
651 mtx_destroy(&sc->sc_queue_mtx);
652 mtx_destroy(&sc->sc_events_mtx);
653 sx_xunlock(&sc->sc_lock);
654 sx_destroy(&sc->sc_lock);
655 }
656
657 static void
g_raid3_orphan(struct g_consumer * cp)658 g_raid3_orphan(struct g_consumer *cp)
659 {
660 struct g_raid3_disk *disk;
661
662 g_topology_assert();
663
664 disk = cp->private;
665 if (disk == NULL)
666 return;
667 disk->d_softc->sc_bump_id = G_RAID3_BUMP_SYNCID;
668 g_raid3_event_send(disk, G_RAID3_DISK_STATE_DISCONNECTED,
669 G_RAID3_EVENT_DONTWAIT);
670 }
671
672 static int
g_raid3_write_metadata(struct g_raid3_disk * disk,struct g_raid3_metadata * md)673 g_raid3_write_metadata(struct g_raid3_disk *disk, struct g_raid3_metadata *md)
674 {
675 struct g_raid3_softc *sc;
676 struct g_consumer *cp;
677 off_t offset, length;
678 u_char *sector;
679 int error = 0;
680
681 g_topology_assert_not();
682 sc = disk->d_softc;
683 sx_assert(&sc->sc_lock, SX_LOCKED);
684
685 cp = disk->d_consumer;
686 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
687 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
688 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
689 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
690 cp->acw, cp->ace));
691 length = cp->provider->sectorsize;
692 offset = cp->provider->mediasize - length;
693 sector = malloc((size_t)length, M_RAID3, M_WAITOK | M_ZERO);
694 if (md != NULL)
695 raid3_metadata_encode(md, sector);
696 error = g_write_data(cp, offset, sector, length);
697 free(sector, M_RAID3);
698 if (error != 0) {
699 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
700 G_RAID3_DEBUG(0, "Cannot write metadata on %s "
701 "(device=%s, error=%d).",
702 g_raid3_get_diskname(disk), sc->sc_name, error);
703 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
704 } else {
705 G_RAID3_DEBUG(1, "Cannot write metadata on %s "
706 "(device=%s, error=%d).",
707 g_raid3_get_diskname(disk), sc->sc_name, error);
708 }
709 if (g_raid3_disconnect_on_failure &&
710 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
711 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
712 g_raid3_event_send(disk,
713 G_RAID3_DISK_STATE_DISCONNECTED,
714 G_RAID3_EVENT_DONTWAIT);
715 }
716 }
717 return (error);
718 }
719
720 int
g_raid3_clear_metadata(struct g_raid3_disk * disk)721 g_raid3_clear_metadata(struct g_raid3_disk *disk)
722 {
723 int error;
724
725 g_topology_assert_not();
726 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
727
728 error = g_raid3_write_metadata(disk, NULL);
729 if (error == 0) {
730 G_RAID3_DEBUG(2, "Metadata on %s cleared.",
731 g_raid3_get_diskname(disk));
732 } else {
733 G_RAID3_DEBUG(0,
734 "Cannot clear metadata on disk %s (error=%d).",
735 g_raid3_get_diskname(disk), error);
736 }
737 return (error);
738 }
739
740 void
g_raid3_fill_metadata(struct g_raid3_disk * disk,struct g_raid3_metadata * md)741 g_raid3_fill_metadata(struct g_raid3_disk *disk, struct g_raid3_metadata *md)
742 {
743 struct g_raid3_softc *sc;
744 struct g_provider *pp;
745
746 sc = disk->d_softc;
747 strlcpy(md->md_magic, G_RAID3_MAGIC, sizeof(md->md_magic));
748 md->md_version = G_RAID3_VERSION;
749 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
750 md->md_id = sc->sc_id;
751 md->md_all = sc->sc_ndisks;
752 md->md_genid = sc->sc_genid;
753 md->md_mediasize = sc->sc_mediasize;
754 md->md_sectorsize = sc->sc_sectorsize;
755 md->md_mflags = (sc->sc_flags & G_RAID3_DEVICE_FLAG_MASK);
756 md->md_no = disk->d_no;
757 md->md_syncid = disk->d_sync.ds_syncid;
758 md->md_dflags = (disk->d_flags & G_RAID3_DISK_FLAG_MASK);
759 if (disk->d_state != G_RAID3_DISK_STATE_SYNCHRONIZING)
760 md->md_sync_offset = 0;
761 else {
762 md->md_sync_offset =
763 disk->d_sync.ds_offset_done / (sc->sc_ndisks - 1);
764 }
765 if (disk->d_consumer != NULL && disk->d_consumer->provider != NULL)
766 pp = disk->d_consumer->provider;
767 else
768 pp = NULL;
769 if ((disk->d_flags & G_RAID3_DISK_FLAG_HARDCODED) != 0 && pp != NULL)
770 strlcpy(md->md_provider, pp->name, sizeof(md->md_provider));
771 else
772 bzero(md->md_provider, sizeof(md->md_provider));
773 if (pp != NULL)
774 md->md_provsize = pp->mediasize;
775 else
776 md->md_provsize = 0;
777 }
778
779 void
g_raid3_update_metadata(struct g_raid3_disk * disk)780 g_raid3_update_metadata(struct g_raid3_disk *disk)
781 {
782 struct g_raid3_softc *sc;
783 struct g_raid3_metadata md;
784 int error;
785
786 g_topology_assert_not();
787 sc = disk->d_softc;
788 sx_assert(&sc->sc_lock, SX_LOCKED);
789
790 g_raid3_fill_metadata(disk, &md);
791 error = g_raid3_write_metadata(disk, &md);
792 if (error == 0) {
793 G_RAID3_DEBUG(2, "Metadata on %s updated.",
794 g_raid3_get_diskname(disk));
795 } else {
796 G_RAID3_DEBUG(0,
797 "Cannot update metadata on disk %s (error=%d).",
798 g_raid3_get_diskname(disk), error);
799 }
800 }
801
802 static void
g_raid3_bump_syncid(struct g_raid3_softc * sc)803 g_raid3_bump_syncid(struct g_raid3_softc *sc)
804 {
805 struct g_raid3_disk *disk;
806 u_int n;
807
808 g_topology_assert_not();
809 sx_assert(&sc->sc_lock, SX_XLOCKED);
810 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) > 0,
811 ("%s called with no active disks (device=%s).", __func__,
812 sc->sc_name));
813
814 sc->sc_syncid++;
815 G_RAID3_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
816 sc->sc_syncid);
817 for (n = 0; n < sc->sc_ndisks; n++) {
818 disk = &sc->sc_disks[n];
819 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
820 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
821 disk->d_sync.ds_syncid = sc->sc_syncid;
822 g_raid3_update_metadata(disk);
823 }
824 }
825 }
826
827 static void
g_raid3_bump_genid(struct g_raid3_softc * sc)828 g_raid3_bump_genid(struct g_raid3_softc *sc)
829 {
830 struct g_raid3_disk *disk;
831 u_int n;
832
833 g_topology_assert_not();
834 sx_assert(&sc->sc_lock, SX_XLOCKED);
835 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) > 0,
836 ("%s called with no active disks (device=%s).", __func__,
837 sc->sc_name));
838
839 sc->sc_genid++;
840 G_RAID3_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
841 sc->sc_genid);
842 for (n = 0; n < sc->sc_ndisks; n++) {
843 disk = &sc->sc_disks[n];
844 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
845 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
846 disk->d_genid = sc->sc_genid;
847 g_raid3_update_metadata(disk);
848 }
849 }
850 }
851
852 static int
g_raid3_idle(struct g_raid3_softc * sc,int acw)853 g_raid3_idle(struct g_raid3_softc *sc, int acw)
854 {
855 struct g_raid3_disk *disk;
856 u_int i;
857 int timeout;
858
859 g_topology_assert_not();
860 sx_assert(&sc->sc_lock, SX_XLOCKED);
861
862 if (sc->sc_provider == NULL)
863 return (0);
864 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
865 return (0);
866 if (sc->sc_idle)
867 return (0);
868 if (sc->sc_writes > 0)
869 return (0);
870 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
871 timeout = g_raid3_idletime - (time_uptime - sc->sc_last_write);
872 if (!g_raid3_shutdown && timeout > 0)
873 return (timeout);
874 }
875 sc->sc_idle = 1;
876 for (i = 0; i < sc->sc_ndisks; i++) {
877 disk = &sc->sc_disks[i];
878 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
879 continue;
880 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as clean.",
881 g_raid3_get_diskname(disk), sc->sc_name);
882 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
883 g_raid3_update_metadata(disk);
884 }
885 return (0);
886 }
887
888 static void
g_raid3_unidle(struct g_raid3_softc * sc)889 g_raid3_unidle(struct g_raid3_softc *sc)
890 {
891 struct g_raid3_disk *disk;
892 u_int i;
893
894 g_topology_assert_not();
895 sx_assert(&sc->sc_lock, SX_XLOCKED);
896
897 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
898 return;
899 sc->sc_idle = 0;
900 sc->sc_last_write = time_uptime;
901 for (i = 0; i < sc->sc_ndisks; i++) {
902 disk = &sc->sc_disks[i];
903 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
904 continue;
905 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as dirty.",
906 g_raid3_get_diskname(disk), sc->sc_name);
907 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
908 g_raid3_update_metadata(disk);
909 }
910 }
911
912 /*
913 * Treat bio_driver1 field in parent bio as list head and field bio_caller1
914 * in child bio as pointer to the next element on the list.
915 */
916 #define G_RAID3_HEAD_BIO(pbp) (pbp)->bio_driver1
917
918 #define G_RAID3_NEXT_BIO(cbp) (cbp)->bio_caller1
919
920 #define G_RAID3_FOREACH_BIO(pbp, bp) \
921 for ((bp) = G_RAID3_HEAD_BIO(pbp); (bp) != NULL; \
922 (bp) = G_RAID3_NEXT_BIO(bp))
923
924 #define G_RAID3_FOREACH_SAFE_BIO(pbp, bp, tmpbp) \
925 for ((bp) = G_RAID3_HEAD_BIO(pbp); \
926 (bp) != NULL && ((tmpbp) = G_RAID3_NEXT_BIO(bp), 1); \
927 (bp) = (tmpbp))
928
929 static void
g_raid3_init_bio(struct bio * pbp)930 g_raid3_init_bio(struct bio *pbp)
931 {
932
933 G_RAID3_HEAD_BIO(pbp) = NULL;
934 }
935
936 static void
g_raid3_remove_bio(struct bio * cbp)937 g_raid3_remove_bio(struct bio *cbp)
938 {
939 struct bio *pbp, *bp;
940
941 pbp = cbp->bio_parent;
942 if (G_RAID3_HEAD_BIO(pbp) == cbp)
943 G_RAID3_HEAD_BIO(pbp) = G_RAID3_NEXT_BIO(cbp);
944 else {
945 G_RAID3_FOREACH_BIO(pbp, bp) {
946 if (G_RAID3_NEXT_BIO(bp) == cbp) {
947 G_RAID3_NEXT_BIO(bp) = G_RAID3_NEXT_BIO(cbp);
948 break;
949 }
950 }
951 }
952 G_RAID3_NEXT_BIO(cbp) = NULL;
953 }
954
955 static void
g_raid3_replace_bio(struct bio * sbp,struct bio * dbp)956 g_raid3_replace_bio(struct bio *sbp, struct bio *dbp)
957 {
958 struct bio *pbp, *bp;
959
960 g_raid3_remove_bio(sbp);
961 pbp = dbp->bio_parent;
962 G_RAID3_NEXT_BIO(sbp) = G_RAID3_NEXT_BIO(dbp);
963 if (G_RAID3_HEAD_BIO(pbp) == dbp)
964 G_RAID3_HEAD_BIO(pbp) = sbp;
965 else {
966 G_RAID3_FOREACH_BIO(pbp, bp) {
967 if (G_RAID3_NEXT_BIO(bp) == dbp) {
968 G_RAID3_NEXT_BIO(bp) = sbp;
969 break;
970 }
971 }
972 }
973 G_RAID3_NEXT_BIO(dbp) = NULL;
974 }
975
976 static void
g_raid3_destroy_bio(struct g_raid3_softc * sc,struct bio * cbp)977 g_raid3_destroy_bio(struct g_raid3_softc *sc, struct bio *cbp)
978 {
979 struct bio *bp, *pbp;
980 size_t size;
981
982 pbp = cbp->bio_parent;
983 pbp->bio_children--;
984 KASSERT(cbp->bio_data != NULL, ("NULL bio_data"));
985 size = pbp->bio_length / (sc->sc_ndisks - 1);
986 g_raid3_free(sc, cbp->bio_data, size);
987 if (G_RAID3_HEAD_BIO(pbp) == cbp) {
988 G_RAID3_HEAD_BIO(pbp) = G_RAID3_NEXT_BIO(cbp);
989 G_RAID3_NEXT_BIO(cbp) = NULL;
990 g_destroy_bio(cbp);
991 } else {
992 G_RAID3_FOREACH_BIO(pbp, bp) {
993 if (G_RAID3_NEXT_BIO(bp) == cbp)
994 break;
995 }
996 if (bp != NULL) {
997 KASSERT(G_RAID3_NEXT_BIO(bp) != NULL,
998 ("NULL bp->bio_driver1"));
999 G_RAID3_NEXT_BIO(bp) = G_RAID3_NEXT_BIO(cbp);
1000 G_RAID3_NEXT_BIO(cbp) = NULL;
1001 }
1002 g_destroy_bio(cbp);
1003 }
1004 }
1005
1006 static struct bio *
g_raid3_clone_bio(struct g_raid3_softc * sc,struct bio * pbp)1007 g_raid3_clone_bio(struct g_raid3_softc *sc, struct bio *pbp)
1008 {
1009 struct bio *bp, *cbp;
1010 size_t size;
1011 int memflag;
1012
1013 cbp = g_clone_bio(pbp);
1014 if (cbp == NULL)
1015 return (NULL);
1016 size = pbp->bio_length / (sc->sc_ndisks - 1);
1017 if ((pbp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR) != 0)
1018 memflag = M_WAITOK;
1019 else
1020 memflag = M_NOWAIT;
1021 cbp->bio_data = g_raid3_alloc(sc, size, memflag);
1022 if (cbp->bio_data == NULL) {
1023 pbp->bio_children--;
1024 g_destroy_bio(cbp);
1025 return (NULL);
1026 }
1027 G_RAID3_NEXT_BIO(cbp) = NULL;
1028 if (G_RAID3_HEAD_BIO(pbp) == NULL)
1029 G_RAID3_HEAD_BIO(pbp) = cbp;
1030 else {
1031 G_RAID3_FOREACH_BIO(pbp, bp) {
1032 if (G_RAID3_NEXT_BIO(bp) == NULL) {
1033 G_RAID3_NEXT_BIO(bp) = cbp;
1034 break;
1035 }
1036 }
1037 }
1038 return (cbp);
1039 }
1040
1041 static void
g_raid3_scatter(struct bio * pbp)1042 g_raid3_scatter(struct bio *pbp)
1043 {
1044 struct g_raid3_softc *sc;
1045 struct g_raid3_disk *disk;
1046 struct bio *bp, *cbp, *tmpbp;
1047 off_t atom, cadd, padd, left;
1048 int first;
1049
1050 sc = pbp->bio_to->geom->softc;
1051 bp = NULL;
1052 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_NOPARITY) == 0) {
1053 /*
1054 * Find bio for which we should calculate data.
1055 */
1056 G_RAID3_FOREACH_BIO(pbp, cbp) {
1057 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0) {
1058 bp = cbp;
1059 break;
1060 }
1061 }
1062 KASSERT(bp != NULL, ("NULL parity bio."));
1063 }
1064 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1065 cadd = padd = 0;
1066 for (left = pbp->bio_length; left > 0; left -= sc->sc_sectorsize) {
1067 G_RAID3_FOREACH_BIO(pbp, cbp) {
1068 if (cbp == bp)
1069 continue;
1070 bcopy(pbp->bio_data + padd, cbp->bio_data + cadd, atom);
1071 padd += atom;
1072 }
1073 cadd += atom;
1074 }
1075 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_NOPARITY) == 0) {
1076 /*
1077 * Calculate parity.
1078 */
1079 first = 1;
1080 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1081 if (cbp == bp)
1082 continue;
1083 if (first) {
1084 bcopy(cbp->bio_data, bp->bio_data,
1085 bp->bio_length);
1086 first = 0;
1087 } else {
1088 g_raid3_xor(cbp->bio_data, bp->bio_data,
1089 bp->bio_length);
1090 }
1091 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_NODISK) != 0)
1092 g_raid3_destroy_bio(sc, cbp);
1093 }
1094 }
1095 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1096 struct g_consumer *cp;
1097
1098 disk = cbp->bio_caller2;
1099 cp = disk->d_consumer;
1100 cbp->bio_to = cp->provider;
1101 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1102 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1103 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1104 cp->acr, cp->acw, cp->ace));
1105 cp->index++;
1106 sc->sc_writes++;
1107 g_io_request(cbp, cp);
1108 }
1109 }
1110
1111 static void
g_raid3_gather(struct bio * pbp)1112 g_raid3_gather(struct bio *pbp)
1113 {
1114 struct g_raid3_softc *sc;
1115 struct g_raid3_disk *disk;
1116 struct bio *xbp, *fbp, *cbp;
1117 off_t atom, cadd, padd, left;
1118
1119 sc = pbp->bio_to->geom->softc;
1120 /*
1121 * Find bio for which we have to calculate data.
1122 * While going through this path, check if all requests
1123 * succeeded, if not, deny whole request.
1124 * If we're in COMPLETE mode, we allow one request to fail,
1125 * so if we find one, we're sending it to the parity consumer.
1126 * If there are more failed requests, we deny whole request.
1127 */
1128 xbp = fbp = NULL;
1129 G_RAID3_FOREACH_BIO(pbp, cbp) {
1130 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0) {
1131 KASSERT(xbp == NULL, ("More than one parity bio."));
1132 xbp = cbp;
1133 }
1134 if (cbp->bio_error == 0)
1135 continue;
1136 /*
1137 * Found failed request.
1138 */
1139 if (fbp == NULL) {
1140 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_DEGRADED) != 0) {
1141 /*
1142 * We are already in degraded mode, so we can't
1143 * accept any failures.
1144 */
1145 if (pbp->bio_error == 0)
1146 pbp->bio_error = cbp->bio_error;
1147 } else {
1148 fbp = cbp;
1149 }
1150 } else {
1151 /*
1152 * Next failed request, that's too many.
1153 */
1154 if (pbp->bio_error == 0)
1155 pbp->bio_error = fbp->bio_error;
1156 }
1157 disk = cbp->bio_caller2;
1158 if (disk == NULL)
1159 continue;
1160 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
1161 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
1162 G_RAID3_LOGREQ(0, cbp, "Request failed (error=%d).",
1163 cbp->bio_error);
1164 } else {
1165 G_RAID3_LOGREQ(1, cbp, "Request failed (error=%d).",
1166 cbp->bio_error);
1167 }
1168 if (g_raid3_disconnect_on_failure &&
1169 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1170 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1171 g_raid3_event_send(disk,
1172 G_RAID3_DISK_STATE_DISCONNECTED,
1173 G_RAID3_EVENT_DONTWAIT);
1174 }
1175 }
1176 if (pbp->bio_error != 0)
1177 goto finish;
1178 if (fbp != NULL && (pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0) {
1179 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_VERIFY;
1180 if (xbp != fbp)
1181 g_raid3_replace_bio(xbp, fbp);
1182 g_raid3_destroy_bio(sc, fbp);
1183 } else if (fbp != NULL) {
1184 struct g_consumer *cp;
1185
1186 /*
1187 * One request failed, so send the same request to
1188 * the parity consumer.
1189 */
1190 disk = pbp->bio_driver2;
1191 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE) {
1192 pbp->bio_error = fbp->bio_error;
1193 goto finish;
1194 }
1195 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1196 pbp->bio_inbed--;
1197 fbp->bio_flags &= ~(BIO_DONE | BIO_ERROR);
1198 if (disk->d_no == sc->sc_ndisks - 1)
1199 fbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1200 fbp->bio_error = 0;
1201 fbp->bio_completed = 0;
1202 fbp->bio_children = 0;
1203 fbp->bio_inbed = 0;
1204 cp = disk->d_consumer;
1205 fbp->bio_caller2 = disk;
1206 fbp->bio_to = cp->provider;
1207 G_RAID3_LOGREQ(3, fbp, "Sending request (recover).");
1208 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1209 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1210 cp->acr, cp->acw, cp->ace));
1211 cp->index++;
1212 g_io_request(fbp, cp);
1213 return;
1214 }
1215 if (xbp != NULL) {
1216 /*
1217 * Calculate parity.
1218 */
1219 G_RAID3_FOREACH_BIO(pbp, cbp) {
1220 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0)
1221 continue;
1222 g_raid3_xor(cbp->bio_data, xbp->bio_data,
1223 xbp->bio_length);
1224 }
1225 xbp->bio_cflags &= ~G_RAID3_BIO_CFLAG_PARITY;
1226 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0) {
1227 if (!g_raid3_is_zero(xbp)) {
1228 g_raid3_parity_mismatch++;
1229 pbp->bio_error = EIO;
1230 goto finish;
1231 }
1232 g_raid3_destroy_bio(sc, xbp);
1233 }
1234 }
1235 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1236 cadd = padd = 0;
1237 for (left = pbp->bio_length; left > 0; left -= sc->sc_sectorsize) {
1238 G_RAID3_FOREACH_BIO(pbp, cbp) {
1239 bcopy(cbp->bio_data + cadd, pbp->bio_data + padd, atom);
1240 pbp->bio_completed += atom;
1241 padd += atom;
1242 }
1243 cadd += atom;
1244 }
1245 finish:
1246 if (pbp->bio_error == 0)
1247 G_RAID3_LOGREQ(3, pbp, "Request finished.");
1248 else {
1249 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0)
1250 G_RAID3_LOGREQ(1, pbp, "Verification error.");
1251 else
1252 G_RAID3_LOGREQ(0, pbp, "Request failed.");
1253 }
1254 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_MASK;
1255 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL)
1256 g_raid3_destroy_bio(sc, cbp);
1257 g_io_deliver(pbp, pbp->bio_error);
1258 }
1259
1260 static void
g_raid3_done(struct bio * bp)1261 g_raid3_done(struct bio *bp)
1262 {
1263 struct g_raid3_softc *sc;
1264
1265 sc = bp->bio_from->geom->softc;
1266 bp->bio_cflags |= G_RAID3_BIO_CFLAG_REGULAR;
1267 G_RAID3_LOGREQ(3, bp, "Regular request done (error=%d).", bp->bio_error);
1268 mtx_lock(&sc->sc_queue_mtx);
1269 bioq_insert_head(&sc->sc_queue, bp);
1270 mtx_unlock(&sc->sc_queue_mtx);
1271 wakeup(sc);
1272 wakeup(&sc->sc_queue);
1273 }
1274
1275 static void
g_raid3_regular_request(struct bio * cbp)1276 g_raid3_regular_request(struct bio *cbp)
1277 {
1278 struct g_raid3_softc *sc;
1279 struct g_raid3_disk *disk;
1280 struct bio *pbp;
1281
1282 g_topology_assert_not();
1283
1284 pbp = cbp->bio_parent;
1285 sc = pbp->bio_to->geom->softc;
1286 cbp->bio_from->index--;
1287 if (cbp->bio_cmd == BIO_WRITE)
1288 sc->sc_writes--;
1289 disk = cbp->bio_from->private;
1290 if (disk == NULL) {
1291 g_topology_lock();
1292 g_raid3_kill_consumer(sc, cbp->bio_from);
1293 g_topology_unlock();
1294 }
1295
1296 G_RAID3_LOGREQ(3, cbp, "Request finished.");
1297 pbp->bio_inbed++;
1298 KASSERT(pbp->bio_inbed <= pbp->bio_children,
1299 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
1300 pbp->bio_children));
1301 if (pbp->bio_inbed != pbp->bio_children)
1302 return;
1303 switch (pbp->bio_cmd) {
1304 case BIO_READ:
1305 g_raid3_gather(pbp);
1306 break;
1307 case BIO_WRITE:
1308 case BIO_DELETE:
1309 {
1310 int error = 0;
1311
1312 pbp->bio_completed = pbp->bio_length;
1313 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL) {
1314 if (cbp->bio_error == 0) {
1315 g_raid3_destroy_bio(sc, cbp);
1316 continue;
1317 }
1318
1319 if (error == 0)
1320 error = cbp->bio_error;
1321 else if (pbp->bio_error == 0) {
1322 /*
1323 * Next failed request, that's too many.
1324 */
1325 pbp->bio_error = error;
1326 }
1327
1328 disk = cbp->bio_caller2;
1329 if (disk == NULL) {
1330 g_raid3_destroy_bio(sc, cbp);
1331 continue;
1332 }
1333
1334 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
1335 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
1336 G_RAID3_LOGREQ(0, cbp,
1337 "Request failed (error=%d).",
1338 cbp->bio_error);
1339 } else {
1340 G_RAID3_LOGREQ(1, cbp,
1341 "Request failed (error=%d).",
1342 cbp->bio_error);
1343 }
1344 if (g_raid3_disconnect_on_failure &&
1345 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1346 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1347 g_raid3_event_send(disk,
1348 G_RAID3_DISK_STATE_DISCONNECTED,
1349 G_RAID3_EVENT_DONTWAIT);
1350 }
1351 g_raid3_destroy_bio(sc, cbp);
1352 }
1353 if (pbp->bio_error == 0)
1354 G_RAID3_LOGREQ(3, pbp, "Request finished.");
1355 else
1356 G_RAID3_LOGREQ(0, pbp, "Request failed.");
1357 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_DEGRADED;
1358 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_NOPARITY;
1359 bioq_remove(&sc->sc_inflight, pbp);
1360 /* Release delayed sync requests if possible. */
1361 g_raid3_sync_release(sc);
1362 g_io_deliver(pbp, pbp->bio_error);
1363 break;
1364 }
1365 }
1366 }
1367
1368 static void
g_raid3_sync_done(struct bio * bp)1369 g_raid3_sync_done(struct bio *bp)
1370 {
1371 struct g_raid3_softc *sc;
1372
1373 G_RAID3_LOGREQ(3, bp, "Synchronization request delivered.");
1374 sc = bp->bio_from->geom->softc;
1375 bp->bio_cflags |= G_RAID3_BIO_CFLAG_SYNC;
1376 mtx_lock(&sc->sc_queue_mtx);
1377 bioq_insert_head(&sc->sc_queue, bp);
1378 mtx_unlock(&sc->sc_queue_mtx);
1379 wakeup(sc);
1380 wakeup(&sc->sc_queue);
1381 }
1382
1383 static void
g_raid3_flush(struct g_raid3_softc * sc,struct bio * bp)1384 g_raid3_flush(struct g_raid3_softc *sc, struct bio *bp)
1385 {
1386 struct bio_queue_head queue;
1387 struct g_raid3_disk *disk;
1388 struct g_consumer *cp;
1389 struct bio *cbp;
1390 u_int i;
1391
1392 bioq_init(&queue);
1393 for (i = 0; i < sc->sc_ndisks; i++) {
1394 disk = &sc->sc_disks[i];
1395 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
1396 continue;
1397 cbp = g_clone_bio(bp);
1398 if (cbp == NULL) {
1399 for (cbp = bioq_first(&queue); cbp != NULL;
1400 cbp = bioq_first(&queue)) {
1401 bioq_remove(&queue, cbp);
1402 g_destroy_bio(cbp);
1403 }
1404 if (bp->bio_error == 0)
1405 bp->bio_error = ENOMEM;
1406 g_io_deliver(bp, bp->bio_error);
1407 return;
1408 }
1409 bioq_insert_tail(&queue, cbp);
1410 cbp->bio_done = g_std_done;
1411 cbp->bio_caller1 = disk;
1412 cbp->bio_to = disk->d_consumer->provider;
1413 }
1414 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
1415 bioq_remove(&queue, cbp);
1416 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1417 disk = cbp->bio_caller1;
1418 cbp->bio_caller1 = NULL;
1419 cp = disk->d_consumer;
1420 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1421 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1422 cp->acr, cp->acw, cp->ace));
1423 g_io_request(cbp, disk->d_consumer);
1424 }
1425 }
1426
1427 static void
g_raid3_start(struct bio * bp)1428 g_raid3_start(struct bio *bp)
1429 {
1430 struct g_raid3_softc *sc;
1431
1432 sc = bp->bio_to->geom->softc;
1433 /*
1434 * If sc == NULL or there are no valid disks, provider's error
1435 * should be set and g_raid3_start() should not be called at all.
1436 */
1437 KASSERT(sc != NULL && (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
1438 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE),
1439 ("Provider's error should be set (error=%d)(device=%s).",
1440 bp->bio_to->error, bp->bio_to->name));
1441 G_RAID3_LOGREQ(3, bp, "Request received.");
1442
1443 switch (bp->bio_cmd) {
1444 case BIO_READ:
1445 case BIO_WRITE:
1446 case BIO_DELETE:
1447 break;
1448 case BIO_FLUSH:
1449 g_raid3_flush(sc, bp);
1450 return;
1451 case BIO_GETATTR:
1452 default:
1453 g_io_deliver(bp, EOPNOTSUPP);
1454 return;
1455 }
1456 mtx_lock(&sc->sc_queue_mtx);
1457 bioq_insert_tail(&sc->sc_queue, bp);
1458 mtx_unlock(&sc->sc_queue_mtx);
1459 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1460 wakeup(sc);
1461 }
1462
1463 /*
1464 * Return TRUE if the given request is colliding with a in-progress
1465 * synchronization request.
1466 */
1467 static int
g_raid3_sync_collision(struct g_raid3_softc * sc,struct bio * bp)1468 g_raid3_sync_collision(struct g_raid3_softc *sc, struct bio *bp)
1469 {
1470 struct g_raid3_disk *disk;
1471 struct bio *sbp;
1472 off_t rstart, rend, sstart, send;
1473 int i;
1474
1475 disk = sc->sc_syncdisk;
1476 if (disk == NULL)
1477 return (0);
1478 rstart = bp->bio_offset;
1479 rend = bp->bio_offset + bp->bio_length;
1480 for (i = 0; i < g_raid3_syncreqs; i++) {
1481 sbp = disk->d_sync.ds_bios[i];
1482 if (sbp == NULL)
1483 continue;
1484 sstart = sbp->bio_offset;
1485 send = sbp->bio_length;
1486 if (sbp->bio_cmd == BIO_WRITE) {
1487 sstart *= sc->sc_ndisks - 1;
1488 send *= sc->sc_ndisks - 1;
1489 }
1490 send += sstart;
1491 if (rend > sstart && rstart < send)
1492 return (1);
1493 }
1494 return (0);
1495 }
1496
1497 /*
1498 * Return TRUE if the given sync request is colliding with a in-progress regular
1499 * request.
1500 */
1501 static int
g_raid3_regular_collision(struct g_raid3_softc * sc,struct bio * sbp)1502 g_raid3_regular_collision(struct g_raid3_softc *sc, struct bio *sbp)
1503 {
1504 off_t rstart, rend, sstart, send;
1505 struct bio *bp;
1506
1507 if (sc->sc_syncdisk == NULL)
1508 return (0);
1509 sstart = sbp->bio_offset;
1510 send = sstart + sbp->bio_length;
1511 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) {
1512 rstart = bp->bio_offset;
1513 rend = bp->bio_offset + bp->bio_length;
1514 if (rend > sstart && rstart < send)
1515 return (1);
1516 }
1517 return (0);
1518 }
1519
1520 /*
1521 * Puts request onto delayed queue.
1522 */
1523 static void
g_raid3_regular_delay(struct g_raid3_softc * sc,struct bio * bp)1524 g_raid3_regular_delay(struct g_raid3_softc *sc, struct bio *bp)
1525 {
1526
1527 G_RAID3_LOGREQ(2, bp, "Delaying request.");
1528 bioq_insert_head(&sc->sc_regular_delayed, bp);
1529 }
1530
1531 /*
1532 * Puts synchronization request onto delayed queue.
1533 */
1534 static void
g_raid3_sync_delay(struct g_raid3_softc * sc,struct bio * bp)1535 g_raid3_sync_delay(struct g_raid3_softc *sc, struct bio *bp)
1536 {
1537
1538 G_RAID3_LOGREQ(2, bp, "Delaying synchronization request.");
1539 bioq_insert_tail(&sc->sc_sync_delayed, bp);
1540 }
1541
1542 /*
1543 * Releases delayed regular requests which don't collide anymore with sync
1544 * requests.
1545 */
1546 static void
g_raid3_regular_release(struct g_raid3_softc * sc)1547 g_raid3_regular_release(struct g_raid3_softc *sc)
1548 {
1549 struct bio *bp, *bp2;
1550
1551 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) {
1552 if (g_raid3_sync_collision(sc, bp))
1553 continue;
1554 bioq_remove(&sc->sc_regular_delayed, bp);
1555 G_RAID3_LOGREQ(2, bp, "Releasing delayed request (%p).", bp);
1556 mtx_lock(&sc->sc_queue_mtx);
1557 bioq_insert_head(&sc->sc_queue, bp);
1558 #if 0
1559 /*
1560 * wakeup() is not needed, because this function is called from
1561 * the worker thread.
1562 */
1563 wakeup(&sc->sc_queue);
1564 #endif
1565 mtx_unlock(&sc->sc_queue_mtx);
1566 }
1567 }
1568
1569 /*
1570 * Releases delayed sync requests which don't collide anymore with regular
1571 * requests.
1572 */
1573 static void
g_raid3_sync_release(struct g_raid3_softc * sc)1574 g_raid3_sync_release(struct g_raid3_softc *sc)
1575 {
1576 struct bio *bp, *bp2;
1577
1578 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) {
1579 if (g_raid3_regular_collision(sc, bp))
1580 continue;
1581 bioq_remove(&sc->sc_sync_delayed, bp);
1582 G_RAID3_LOGREQ(2, bp,
1583 "Releasing delayed synchronization request.");
1584 g_io_request(bp, bp->bio_from);
1585 }
1586 }
1587
1588 /*
1589 * Handle synchronization requests.
1590 * Every synchronization request is two-steps process: first, READ request is
1591 * send to active provider and then WRITE request (with read data) to the provider
1592 * being synchronized. When WRITE is finished, new synchronization request is
1593 * send.
1594 */
1595 static void
g_raid3_sync_request(struct bio * bp)1596 g_raid3_sync_request(struct bio *bp)
1597 {
1598 struct g_raid3_softc *sc;
1599 struct g_raid3_disk *disk;
1600
1601 bp->bio_from->index--;
1602 sc = bp->bio_from->geom->softc;
1603 disk = bp->bio_from->private;
1604 if (disk == NULL) {
1605 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
1606 g_topology_lock();
1607 g_raid3_kill_consumer(sc, bp->bio_from);
1608 g_topology_unlock();
1609 free(bp->bio_data, M_RAID3);
1610 g_destroy_bio(bp);
1611 sx_xlock(&sc->sc_lock);
1612 return;
1613 }
1614
1615 /*
1616 * Synchronization request.
1617 */
1618 switch (bp->bio_cmd) {
1619 case BIO_READ:
1620 {
1621 struct g_consumer *cp;
1622 u_char *dst, *src;
1623 off_t left;
1624 u_int atom;
1625
1626 if (bp->bio_error != 0) {
1627 G_RAID3_LOGREQ(0, bp,
1628 "Synchronization request failed (error=%d).",
1629 bp->bio_error);
1630 g_destroy_bio(bp);
1631 return;
1632 }
1633 G_RAID3_LOGREQ(3, bp, "Synchronization request finished.");
1634 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1635 dst = src = bp->bio_data;
1636 if (disk->d_no == sc->sc_ndisks - 1) {
1637 u_int n;
1638
1639 /* Parity component. */
1640 for (left = bp->bio_length; left > 0;
1641 left -= sc->sc_sectorsize) {
1642 bcopy(src, dst, atom);
1643 src += atom;
1644 for (n = 1; n < sc->sc_ndisks - 1; n++) {
1645 g_raid3_xor(src, dst, atom);
1646 src += atom;
1647 }
1648 dst += atom;
1649 }
1650 } else {
1651 /* Regular component. */
1652 src += atom * disk->d_no;
1653 for (left = bp->bio_length; left > 0;
1654 left -= sc->sc_sectorsize) {
1655 bcopy(src, dst, atom);
1656 src += sc->sc_sectorsize;
1657 dst += atom;
1658 }
1659 }
1660 bp->bio_driver1 = bp->bio_driver2 = NULL;
1661 bp->bio_pflags = 0;
1662 bp->bio_offset /= sc->sc_ndisks - 1;
1663 bp->bio_length /= sc->sc_ndisks - 1;
1664 bp->bio_cmd = BIO_WRITE;
1665 bp->bio_cflags = 0;
1666 bp->bio_children = bp->bio_inbed = 0;
1667 cp = disk->d_consumer;
1668 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1669 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1670 cp->acr, cp->acw, cp->ace));
1671 cp->index++;
1672 g_io_request(bp, cp);
1673 return;
1674 }
1675 case BIO_WRITE:
1676 {
1677 struct g_raid3_disk_sync *sync;
1678 off_t boffset, moffset;
1679 void *data;
1680 int i;
1681
1682 if (bp->bio_error != 0) {
1683 G_RAID3_LOGREQ(0, bp,
1684 "Synchronization request failed (error=%d).",
1685 bp->bio_error);
1686 g_destroy_bio(bp);
1687 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1688 g_raid3_event_send(disk,
1689 G_RAID3_DISK_STATE_DISCONNECTED,
1690 G_RAID3_EVENT_DONTWAIT);
1691 return;
1692 }
1693 G_RAID3_LOGREQ(3, bp, "Synchronization request finished.");
1694 sync = &disk->d_sync;
1695 if (sync->ds_offset == sc->sc_mediasize / (sc->sc_ndisks - 1) ||
1696 sync->ds_consumer == NULL ||
1697 (sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
1698 /* Don't send more synchronization requests. */
1699 sync->ds_inflight--;
1700 if (sync->ds_bios != NULL) {
1701 i = (int)(uintptr_t)bp->bio_caller1;
1702 sync->ds_bios[i] = NULL;
1703 }
1704 free(bp->bio_data, M_RAID3);
1705 g_destroy_bio(bp);
1706 if (sync->ds_inflight > 0)
1707 return;
1708 if (sync->ds_consumer == NULL ||
1709 (sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
1710 return;
1711 }
1712 /*
1713 * Disk up-to-date, activate it.
1714 */
1715 g_raid3_event_send(disk, G_RAID3_DISK_STATE_ACTIVE,
1716 G_RAID3_EVENT_DONTWAIT);
1717 return;
1718 }
1719
1720 /* Send next synchronization request. */
1721 data = bp->bio_data;
1722 g_reset_bio(bp);
1723 bp->bio_cmd = BIO_READ;
1724 bp->bio_offset = sync->ds_offset * (sc->sc_ndisks - 1);
1725 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
1726 sync->ds_offset += bp->bio_length / (sc->sc_ndisks - 1);
1727 bp->bio_done = g_raid3_sync_done;
1728 bp->bio_data = data;
1729 bp->bio_from = sync->ds_consumer;
1730 bp->bio_to = sc->sc_provider;
1731 G_RAID3_LOGREQ(3, bp, "Sending synchronization request.");
1732 sync->ds_consumer->index++;
1733 /*
1734 * Delay the request if it is colliding with a regular request.
1735 */
1736 if (g_raid3_regular_collision(sc, bp))
1737 g_raid3_sync_delay(sc, bp);
1738 else
1739 g_io_request(bp, sync->ds_consumer);
1740
1741 /* Release delayed requests if possible. */
1742 g_raid3_regular_release(sc);
1743
1744 /* Find the smallest offset. */
1745 moffset = sc->sc_mediasize;
1746 for (i = 0; i < g_raid3_syncreqs; i++) {
1747 bp = sync->ds_bios[i];
1748 boffset = bp->bio_offset;
1749 if (bp->bio_cmd == BIO_WRITE)
1750 boffset *= sc->sc_ndisks - 1;
1751 if (boffset < moffset)
1752 moffset = boffset;
1753 }
1754 if (sync->ds_offset_done + (MAXPHYS * 100) < moffset) {
1755 /* Update offset_done on every 100 blocks. */
1756 sync->ds_offset_done = moffset;
1757 g_raid3_update_metadata(disk);
1758 }
1759 return;
1760 }
1761 default:
1762 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1763 bp->bio_cmd, sc->sc_name));
1764 break;
1765 }
1766 }
1767
1768 static int
g_raid3_register_request(struct bio * pbp)1769 g_raid3_register_request(struct bio *pbp)
1770 {
1771 struct g_raid3_softc *sc;
1772 struct g_raid3_disk *disk;
1773 struct g_consumer *cp;
1774 struct bio *cbp, *tmpbp;
1775 off_t offset, length;
1776 u_int n, ndisks;
1777 int round_robin, verify;
1778
1779 ndisks = 0;
1780 sc = pbp->bio_to->geom->softc;
1781 if ((pbp->bio_cflags & G_RAID3_BIO_CFLAG_REGSYNC) != 0 &&
1782 sc->sc_syncdisk == NULL) {
1783 g_io_deliver(pbp, EIO);
1784 return (0);
1785 }
1786 g_raid3_init_bio(pbp);
1787 length = pbp->bio_length / (sc->sc_ndisks - 1);
1788 offset = pbp->bio_offset / (sc->sc_ndisks - 1);
1789 round_robin = verify = 0;
1790 switch (pbp->bio_cmd) {
1791 case BIO_READ:
1792 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_VERIFY) != 0 &&
1793 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1794 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_VERIFY;
1795 verify = 1;
1796 ndisks = sc->sc_ndisks;
1797 } else {
1798 verify = 0;
1799 ndisks = sc->sc_ndisks - 1;
1800 }
1801 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0 &&
1802 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1803 round_robin = 1;
1804 } else {
1805 round_robin = 0;
1806 }
1807 KASSERT(!round_robin || !verify,
1808 ("ROUND-ROBIN and VERIFY are mutually exclusive."));
1809 pbp->bio_driver2 = &sc->sc_disks[sc->sc_ndisks - 1];
1810 break;
1811 case BIO_WRITE:
1812 case BIO_DELETE:
1813 /*
1814 * Delay the request if it is colliding with a synchronization
1815 * request.
1816 */
1817 if (g_raid3_sync_collision(sc, pbp)) {
1818 g_raid3_regular_delay(sc, pbp);
1819 return (0);
1820 }
1821
1822 if (sc->sc_idle)
1823 g_raid3_unidle(sc);
1824 else
1825 sc->sc_last_write = time_uptime;
1826
1827 ndisks = sc->sc_ndisks;
1828 break;
1829 }
1830 for (n = 0; n < ndisks; n++) {
1831 disk = &sc->sc_disks[n];
1832 cbp = g_raid3_clone_bio(sc, pbp);
1833 if (cbp == NULL) {
1834 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL)
1835 g_raid3_destroy_bio(sc, cbp);
1836 /*
1837 * To prevent deadlock, we must run back up
1838 * with the ENOMEM for failed requests of any
1839 * of our consumers. Our own sync requests
1840 * can stick around, as they are finite.
1841 */
1842 if ((pbp->bio_cflags &
1843 G_RAID3_BIO_CFLAG_REGULAR) != 0) {
1844 g_io_deliver(pbp, ENOMEM);
1845 return (0);
1846 }
1847 return (ENOMEM);
1848 }
1849 cbp->bio_offset = offset;
1850 cbp->bio_length = length;
1851 cbp->bio_done = g_raid3_done;
1852 switch (pbp->bio_cmd) {
1853 case BIO_READ:
1854 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE) {
1855 /*
1856 * Replace invalid component with the parity
1857 * component.
1858 */
1859 disk = &sc->sc_disks[sc->sc_ndisks - 1];
1860 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1861 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1862 } else if (round_robin &&
1863 disk->d_no == sc->sc_round_robin) {
1864 /*
1865 * In round-robin mode skip one data component
1866 * and use parity component when reading.
1867 */
1868 pbp->bio_driver2 = disk;
1869 disk = &sc->sc_disks[sc->sc_ndisks - 1];
1870 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1871 sc->sc_round_robin++;
1872 round_robin = 0;
1873 } else if (verify && disk->d_no == sc->sc_ndisks - 1) {
1874 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1875 }
1876 break;
1877 case BIO_WRITE:
1878 case BIO_DELETE:
1879 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
1880 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
1881 if (n == ndisks - 1) {
1882 /*
1883 * Active parity component, mark it as such.
1884 */
1885 cbp->bio_cflags |=
1886 G_RAID3_BIO_CFLAG_PARITY;
1887 }
1888 } else {
1889 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1890 if (n == ndisks - 1) {
1891 /*
1892 * Parity component is not connected,
1893 * so destroy its request.
1894 */
1895 pbp->bio_pflags |=
1896 G_RAID3_BIO_PFLAG_NOPARITY;
1897 g_raid3_destroy_bio(sc, cbp);
1898 cbp = NULL;
1899 } else {
1900 cbp->bio_cflags |=
1901 G_RAID3_BIO_CFLAG_NODISK;
1902 disk = NULL;
1903 }
1904 }
1905 break;
1906 }
1907 if (cbp != NULL)
1908 cbp->bio_caller2 = disk;
1909 }
1910 switch (pbp->bio_cmd) {
1911 case BIO_READ:
1912 if (round_robin) {
1913 /*
1914 * If we are in round-robin mode and 'round_robin' is
1915 * still 1, it means, that we skipped parity component
1916 * for this read and must reset sc_round_robin field.
1917 */
1918 sc->sc_round_robin = 0;
1919 }
1920 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1921 disk = cbp->bio_caller2;
1922 cp = disk->d_consumer;
1923 cbp->bio_to = cp->provider;
1924 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1925 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1926 ("Consumer %s not opened (r%dw%de%d).",
1927 cp->provider->name, cp->acr, cp->acw, cp->ace));
1928 cp->index++;
1929 g_io_request(cbp, cp);
1930 }
1931 break;
1932 case BIO_WRITE:
1933 case BIO_DELETE:
1934 /*
1935 * Put request onto inflight queue, so we can check if new
1936 * synchronization requests don't collide with it.
1937 */
1938 bioq_insert_tail(&sc->sc_inflight, pbp);
1939
1940 /*
1941 * Bump syncid on first write.
1942 */
1943 if ((sc->sc_bump_id & G_RAID3_BUMP_SYNCID) != 0) {
1944 sc->sc_bump_id &= ~G_RAID3_BUMP_SYNCID;
1945 g_raid3_bump_syncid(sc);
1946 }
1947 g_raid3_scatter(pbp);
1948 break;
1949 }
1950 return (0);
1951 }
1952
1953 static int
g_raid3_can_destroy(struct g_raid3_softc * sc)1954 g_raid3_can_destroy(struct g_raid3_softc *sc)
1955 {
1956 struct g_geom *gp;
1957 struct g_consumer *cp;
1958
1959 g_topology_assert();
1960 gp = sc->sc_geom;
1961 if (gp->softc == NULL)
1962 return (1);
1963 LIST_FOREACH(cp, &gp->consumer, consumer) {
1964 if (g_raid3_is_busy(sc, cp))
1965 return (0);
1966 }
1967 gp = sc->sc_sync.ds_geom;
1968 LIST_FOREACH(cp, &gp->consumer, consumer) {
1969 if (g_raid3_is_busy(sc, cp))
1970 return (0);
1971 }
1972 G_RAID3_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
1973 sc->sc_name);
1974 return (1);
1975 }
1976
1977 static int
g_raid3_try_destroy(struct g_raid3_softc * sc)1978 g_raid3_try_destroy(struct g_raid3_softc *sc)
1979 {
1980
1981 g_topology_assert_not();
1982 sx_assert(&sc->sc_lock, SX_XLOCKED);
1983
1984 if (sc->sc_rootmount != NULL) {
1985 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
1986 sc->sc_rootmount);
1987 root_mount_rel(sc->sc_rootmount);
1988 sc->sc_rootmount = NULL;
1989 }
1990
1991 g_topology_lock();
1992 if (!g_raid3_can_destroy(sc)) {
1993 g_topology_unlock();
1994 return (0);
1995 }
1996 sc->sc_geom->softc = NULL;
1997 sc->sc_sync.ds_geom->softc = NULL;
1998 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_WAIT) != 0) {
1999 g_topology_unlock();
2000 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__,
2001 &sc->sc_worker);
2002 /* Unlock sc_lock here, as it can be destroyed after wakeup. */
2003 sx_xunlock(&sc->sc_lock);
2004 wakeup(&sc->sc_worker);
2005 sc->sc_worker = NULL;
2006 } else {
2007 g_topology_unlock();
2008 g_raid3_destroy_device(sc);
2009 free(sc->sc_disks, M_RAID3);
2010 free(sc, M_RAID3);
2011 }
2012 return (1);
2013 }
2014
2015 /*
2016 * Worker thread.
2017 */
2018 static void
g_raid3_worker(void * arg)2019 g_raid3_worker(void *arg)
2020 {
2021 struct g_raid3_softc *sc;
2022 struct g_raid3_event *ep;
2023 struct bio *bp;
2024 int timeout;
2025
2026 sc = arg;
2027 thread_lock(curthread);
2028 sched_prio(curthread, PRIBIO);
2029 thread_unlock(curthread);
2030
2031 sx_xlock(&sc->sc_lock);
2032 for (;;) {
2033 G_RAID3_DEBUG(5, "%s: Let's see...", __func__);
2034 /*
2035 * First take a look at events.
2036 * This is important to handle events before any I/O requests.
2037 */
2038 ep = g_raid3_event_get(sc);
2039 if (ep != NULL) {
2040 g_raid3_event_remove(sc, ep);
2041 if ((ep->e_flags & G_RAID3_EVENT_DEVICE) != 0) {
2042 /* Update only device status. */
2043 G_RAID3_DEBUG(3,
2044 "Running event for device %s.",
2045 sc->sc_name);
2046 ep->e_error = 0;
2047 g_raid3_update_device(sc, 1);
2048 } else {
2049 /* Update disk status. */
2050 G_RAID3_DEBUG(3, "Running event for disk %s.",
2051 g_raid3_get_diskname(ep->e_disk));
2052 ep->e_error = g_raid3_update_disk(ep->e_disk,
2053 ep->e_state);
2054 if (ep->e_error == 0)
2055 g_raid3_update_device(sc, 0);
2056 }
2057 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0) {
2058 KASSERT(ep->e_error == 0,
2059 ("Error cannot be handled."));
2060 g_raid3_event_free(ep);
2061 } else {
2062 ep->e_flags |= G_RAID3_EVENT_DONE;
2063 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__,
2064 ep);
2065 mtx_lock(&sc->sc_events_mtx);
2066 wakeup(ep);
2067 mtx_unlock(&sc->sc_events_mtx);
2068 }
2069 if ((sc->sc_flags &
2070 G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
2071 if (g_raid3_try_destroy(sc)) {
2072 curthread->td_pflags &= ~TDP_GEOM;
2073 G_RAID3_DEBUG(1, "Thread exiting.");
2074 kproc_exit(0);
2075 }
2076 }
2077 G_RAID3_DEBUG(5, "%s: I'm here 1.", __func__);
2078 continue;
2079 }
2080 /*
2081 * Check if we can mark array as CLEAN and if we can't take
2082 * how much seconds should we wait.
2083 */
2084 timeout = g_raid3_idle(sc, -1);
2085 /*
2086 * Now I/O requests.
2087 */
2088 /* Get first request from the queue. */
2089 mtx_lock(&sc->sc_queue_mtx);
2090 bp = bioq_first(&sc->sc_queue);
2091 if (bp == NULL) {
2092 if ((sc->sc_flags &
2093 G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
2094 mtx_unlock(&sc->sc_queue_mtx);
2095 if (g_raid3_try_destroy(sc)) {
2096 curthread->td_pflags &= ~TDP_GEOM;
2097 G_RAID3_DEBUG(1, "Thread exiting.");
2098 kproc_exit(0);
2099 }
2100 mtx_lock(&sc->sc_queue_mtx);
2101 }
2102 sx_xunlock(&sc->sc_lock);
2103 /*
2104 * XXX: We can miss an event here, because an event
2105 * can be added without sx-device-lock and without
2106 * mtx-queue-lock. Maybe I should just stop using
2107 * dedicated mutex for events synchronization and
2108 * stick with the queue lock?
2109 * The event will hang here until next I/O request
2110 * or next event is received.
2111 */
2112 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "r3:w1",
2113 timeout * hz);
2114 sx_xlock(&sc->sc_lock);
2115 G_RAID3_DEBUG(5, "%s: I'm here 4.", __func__);
2116 continue;
2117 }
2118 process:
2119 bioq_remove(&sc->sc_queue, bp);
2120 mtx_unlock(&sc->sc_queue_mtx);
2121
2122 if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
2123 (bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC) != 0) {
2124 g_raid3_sync_request(bp); /* READ */
2125 } else if (bp->bio_to != sc->sc_provider) {
2126 if ((bp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR) != 0)
2127 g_raid3_regular_request(bp);
2128 else if ((bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC) != 0)
2129 g_raid3_sync_request(bp); /* WRITE */
2130 else {
2131 KASSERT(0,
2132 ("Invalid request cflags=0x%hx to=%s.",
2133 bp->bio_cflags, bp->bio_to->name));
2134 }
2135 } else if (g_raid3_register_request(bp) != 0) {
2136 mtx_lock(&sc->sc_queue_mtx);
2137 bioq_insert_head(&sc->sc_queue, bp);
2138 /*
2139 * We are short in memory, let see if there are finished
2140 * request we can free.
2141 */
2142 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
2143 if (bp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR)
2144 goto process;
2145 }
2146 /*
2147 * No finished regular request, so at least keep
2148 * synchronization running.
2149 */
2150 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
2151 if (bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC)
2152 goto process;
2153 }
2154 sx_xunlock(&sc->sc_lock);
2155 MSLEEP(&sc->sc_queue, &sc->sc_queue_mtx, PRIBIO | PDROP,
2156 "r3:lowmem", hz / 10);
2157 sx_xlock(&sc->sc_lock);
2158 }
2159 G_RAID3_DEBUG(5, "%s: I'm here 9.", __func__);
2160 }
2161 }
2162
2163 static void
g_raid3_update_idle(struct g_raid3_softc * sc,struct g_raid3_disk * disk)2164 g_raid3_update_idle(struct g_raid3_softc *sc, struct g_raid3_disk *disk)
2165 {
2166
2167 sx_assert(&sc->sc_lock, SX_LOCKED);
2168 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
2169 return;
2170 if (!sc->sc_idle && (disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) == 0) {
2171 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as dirty.",
2172 g_raid3_get_diskname(disk), sc->sc_name);
2173 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
2174 } else if (sc->sc_idle &&
2175 (disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) != 0) {
2176 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as clean.",
2177 g_raid3_get_diskname(disk), sc->sc_name);
2178 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2179 }
2180 }
2181
2182 static void
g_raid3_sync_start(struct g_raid3_softc * sc)2183 g_raid3_sync_start(struct g_raid3_softc *sc)
2184 {
2185 struct g_raid3_disk *disk;
2186 struct g_consumer *cp;
2187 struct bio *bp;
2188 int error;
2189 u_int n;
2190
2191 g_topology_assert_not();
2192 sx_assert(&sc->sc_lock, SX_XLOCKED);
2193
2194 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED,
2195 ("Device not in DEGRADED state (%s, %u).", sc->sc_name,
2196 sc->sc_state));
2197 KASSERT(sc->sc_syncdisk == NULL, ("Syncdisk is not NULL (%s, %u).",
2198 sc->sc_name, sc->sc_state));
2199 disk = NULL;
2200 for (n = 0; n < sc->sc_ndisks; n++) {
2201 if (sc->sc_disks[n].d_state != G_RAID3_DISK_STATE_SYNCHRONIZING)
2202 continue;
2203 disk = &sc->sc_disks[n];
2204 break;
2205 }
2206 if (disk == NULL)
2207 return;
2208
2209 sx_xunlock(&sc->sc_lock);
2210 g_topology_lock();
2211 cp = g_new_consumer(sc->sc_sync.ds_geom);
2212 error = g_attach(cp, sc->sc_provider);
2213 KASSERT(error == 0,
2214 ("Cannot attach to %s (error=%d).", sc->sc_name, error));
2215 error = g_access(cp, 1, 0, 0);
2216 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
2217 g_topology_unlock();
2218 sx_xlock(&sc->sc_lock);
2219
2220 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
2221 g_raid3_get_diskname(disk));
2222 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) == 0)
2223 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
2224 KASSERT(disk->d_sync.ds_consumer == NULL,
2225 ("Sync consumer already exists (device=%s, disk=%s).",
2226 sc->sc_name, g_raid3_get_diskname(disk)));
2227
2228 disk->d_sync.ds_consumer = cp;
2229 disk->d_sync.ds_consumer->private = disk;
2230 disk->d_sync.ds_consumer->index = 0;
2231 sc->sc_syncdisk = disk;
2232
2233 /*
2234 * Allocate memory for synchronization bios and initialize them.
2235 */
2236 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_raid3_syncreqs,
2237 M_RAID3, M_WAITOK);
2238 for (n = 0; n < g_raid3_syncreqs; n++) {
2239 bp = g_alloc_bio();
2240 disk->d_sync.ds_bios[n] = bp;
2241 bp->bio_parent = NULL;
2242 bp->bio_cmd = BIO_READ;
2243 bp->bio_data = malloc(MAXPHYS, M_RAID3, M_WAITOK);
2244 bp->bio_cflags = 0;
2245 bp->bio_offset = disk->d_sync.ds_offset * (sc->sc_ndisks - 1);
2246 bp->bio_length = MIN(MAXPHYS, sc->sc_mediasize - bp->bio_offset);
2247 disk->d_sync.ds_offset += bp->bio_length / (sc->sc_ndisks - 1);
2248 bp->bio_done = g_raid3_sync_done;
2249 bp->bio_from = disk->d_sync.ds_consumer;
2250 bp->bio_to = sc->sc_provider;
2251 bp->bio_caller1 = (void *)(uintptr_t)n;
2252 }
2253
2254 /* Set the number of in-flight synchronization requests. */
2255 disk->d_sync.ds_inflight = g_raid3_syncreqs;
2256
2257 /*
2258 * Fire off first synchronization requests.
2259 */
2260 for (n = 0; n < g_raid3_syncreqs; n++) {
2261 bp = disk->d_sync.ds_bios[n];
2262 G_RAID3_LOGREQ(3, bp, "Sending synchronization request.");
2263 disk->d_sync.ds_consumer->index++;
2264 /*
2265 * Delay the request if it is colliding with a regular request.
2266 */
2267 if (g_raid3_regular_collision(sc, bp))
2268 g_raid3_sync_delay(sc, bp);
2269 else
2270 g_io_request(bp, disk->d_sync.ds_consumer);
2271 }
2272 }
2273
2274 /*
2275 * Stop synchronization process.
2276 * type: 0 - synchronization finished
2277 * 1 - synchronization stopped
2278 */
2279 static void
g_raid3_sync_stop(struct g_raid3_softc * sc,int type)2280 g_raid3_sync_stop(struct g_raid3_softc *sc, int type)
2281 {
2282 struct g_raid3_disk *disk;
2283 struct g_consumer *cp;
2284
2285 g_topology_assert_not();
2286 sx_assert(&sc->sc_lock, SX_LOCKED);
2287
2288 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED,
2289 ("Device not in DEGRADED state (%s, %u).", sc->sc_name,
2290 sc->sc_state));
2291 disk = sc->sc_syncdisk;
2292 sc->sc_syncdisk = NULL;
2293 KASSERT(disk != NULL, ("No disk was synchronized (%s).", sc->sc_name));
2294 KASSERT(disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2295 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2296 g_raid3_disk_state2str(disk->d_state)));
2297 if (disk->d_sync.ds_consumer == NULL)
2298 return;
2299
2300 if (type == 0) {
2301 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s finished.",
2302 sc->sc_name, g_raid3_get_diskname(disk));
2303 } else /* if (type == 1) */ {
2304 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
2305 sc->sc_name, g_raid3_get_diskname(disk));
2306 }
2307 free(disk->d_sync.ds_bios, M_RAID3);
2308 disk->d_sync.ds_bios = NULL;
2309 cp = disk->d_sync.ds_consumer;
2310 disk->d_sync.ds_consumer = NULL;
2311 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2312 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
2313 g_topology_lock();
2314 g_raid3_kill_consumer(sc, cp);
2315 g_topology_unlock();
2316 sx_xlock(&sc->sc_lock);
2317 }
2318
2319 static void
g_raid3_launch_provider(struct g_raid3_softc * sc)2320 g_raid3_launch_provider(struct g_raid3_softc *sc)
2321 {
2322 struct g_provider *pp;
2323 struct g_raid3_disk *disk;
2324 int n;
2325
2326 sx_assert(&sc->sc_lock, SX_LOCKED);
2327
2328 g_topology_lock();
2329 pp = g_new_providerf(sc->sc_geom, "raid3/%s", sc->sc_name);
2330 pp->mediasize = sc->sc_mediasize;
2331 pp->sectorsize = sc->sc_sectorsize;
2332 pp->stripesize = 0;
2333 pp->stripeoffset = 0;
2334 for (n = 0; n < sc->sc_ndisks; n++) {
2335 disk = &sc->sc_disks[n];
2336 if (disk->d_consumer && disk->d_consumer->provider &&
2337 disk->d_consumer->provider->stripesize > pp->stripesize) {
2338 pp->stripesize = disk->d_consumer->provider->stripesize;
2339 pp->stripeoffset = disk->d_consumer->provider->stripeoffset;
2340 }
2341 }
2342 pp->stripesize *= sc->sc_ndisks - 1;
2343 pp->stripeoffset *= sc->sc_ndisks - 1;
2344 sc->sc_provider = pp;
2345 g_error_provider(pp, 0);
2346 g_topology_unlock();
2347 G_RAID3_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
2348 g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE), sc->sc_ndisks);
2349
2350 if (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED)
2351 g_raid3_sync_start(sc);
2352 }
2353
2354 static void
g_raid3_destroy_provider(struct g_raid3_softc * sc)2355 g_raid3_destroy_provider(struct g_raid3_softc *sc)
2356 {
2357 struct bio *bp;
2358
2359 g_topology_assert_not();
2360 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
2361 sc->sc_name));
2362
2363 g_topology_lock();
2364 g_error_provider(sc->sc_provider, ENXIO);
2365 mtx_lock(&sc->sc_queue_mtx);
2366 while ((bp = bioq_first(&sc->sc_queue)) != NULL) {
2367 bioq_remove(&sc->sc_queue, bp);
2368 g_io_deliver(bp, ENXIO);
2369 }
2370 mtx_unlock(&sc->sc_queue_mtx);
2371 G_RAID3_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name,
2372 sc->sc_provider->name);
2373 g_wither_provider(sc->sc_provider, ENXIO);
2374 g_topology_unlock();
2375 sc->sc_provider = NULL;
2376 if (sc->sc_syncdisk != NULL)
2377 g_raid3_sync_stop(sc, 1);
2378 }
2379
2380 static void
g_raid3_go(void * arg)2381 g_raid3_go(void *arg)
2382 {
2383 struct g_raid3_softc *sc;
2384
2385 sc = arg;
2386 G_RAID3_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
2387 g_raid3_event_send(sc, 0,
2388 G_RAID3_EVENT_DONTWAIT | G_RAID3_EVENT_DEVICE);
2389 }
2390
2391 static u_int
g_raid3_determine_state(struct g_raid3_disk * disk)2392 g_raid3_determine_state(struct g_raid3_disk *disk)
2393 {
2394 struct g_raid3_softc *sc;
2395 u_int state;
2396
2397 sc = disk->d_softc;
2398 if (sc->sc_syncid == disk->d_sync.ds_syncid) {
2399 if ((disk->d_flags &
2400 G_RAID3_DISK_FLAG_SYNCHRONIZING) == 0) {
2401 /* Disk does not need synchronization. */
2402 state = G_RAID3_DISK_STATE_ACTIVE;
2403 } else {
2404 if ((sc->sc_flags &
2405 G_RAID3_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2406 (disk->d_flags &
2407 G_RAID3_DISK_FLAG_FORCE_SYNC) != 0) {
2408 /*
2409 * We can start synchronization from
2410 * the stored offset.
2411 */
2412 state = G_RAID3_DISK_STATE_SYNCHRONIZING;
2413 } else {
2414 state = G_RAID3_DISK_STATE_STALE;
2415 }
2416 }
2417 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
2418 /*
2419 * Reset all synchronization data for this disk,
2420 * because if it even was synchronized, it was
2421 * synchronized to disks with different syncid.
2422 */
2423 disk->d_flags |= G_RAID3_DISK_FLAG_SYNCHRONIZING;
2424 disk->d_sync.ds_offset = 0;
2425 disk->d_sync.ds_offset_done = 0;
2426 disk->d_sync.ds_syncid = sc->sc_syncid;
2427 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2428 (disk->d_flags & G_RAID3_DISK_FLAG_FORCE_SYNC) != 0) {
2429 state = G_RAID3_DISK_STATE_SYNCHRONIZING;
2430 } else {
2431 state = G_RAID3_DISK_STATE_STALE;
2432 }
2433 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
2434 /*
2435 * Not good, NOT GOOD!
2436 * It means that device was started on stale disks
2437 * and more fresh disk just arrive.
2438 * If there were writes, device is broken, sorry.
2439 * I think the best choice here is don't touch
2440 * this disk and inform the user loudly.
2441 */
2442 G_RAID3_DEBUG(0, "Device %s was started before the freshest "
2443 "disk (%s) arrives!! It will not be connected to the "
2444 "running device.", sc->sc_name,
2445 g_raid3_get_diskname(disk));
2446 g_raid3_destroy_disk(disk);
2447 state = G_RAID3_DISK_STATE_NONE;
2448 /* Return immediately, because disk was destroyed. */
2449 return (state);
2450 }
2451 G_RAID3_DEBUG(3, "State for %s disk: %s.",
2452 g_raid3_get_diskname(disk), g_raid3_disk_state2str(state));
2453 return (state);
2454 }
2455
2456 /*
2457 * Update device state.
2458 */
2459 static void
g_raid3_update_device(struct g_raid3_softc * sc,boolean_t force)2460 g_raid3_update_device(struct g_raid3_softc *sc, boolean_t force)
2461 {
2462 struct g_raid3_disk *disk;
2463 u_int state;
2464
2465 sx_assert(&sc->sc_lock, SX_XLOCKED);
2466
2467 switch (sc->sc_state) {
2468 case G_RAID3_DEVICE_STATE_STARTING:
2469 {
2470 u_int n, ndirty, ndisks, genid, syncid;
2471
2472 KASSERT(sc->sc_provider == NULL,
2473 ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
2474 /*
2475 * Are we ready? We are, if all disks are connected or
2476 * one disk is missing and 'force' is true.
2477 */
2478 if (g_raid3_ndisks(sc, -1) + force == sc->sc_ndisks) {
2479 if (!force)
2480 callout_drain(&sc->sc_callout);
2481 } else {
2482 if (force) {
2483 /*
2484 * Timeout expired, so destroy device.
2485 */
2486 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2487 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p",
2488 __LINE__, sc->sc_rootmount);
2489 root_mount_rel(sc->sc_rootmount);
2490 sc->sc_rootmount = NULL;
2491 }
2492 return;
2493 }
2494
2495 /*
2496 * Find the biggest genid.
2497 */
2498 genid = 0;
2499 for (n = 0; n < sc->sc_ndisks; n++) {
2500 disk = &sc->sc_disks[n];
2501 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2502 continue;
2503 if (disk->d_genid > genid)
2504 genid = disk->d_genid;
2505 }
2506 sc->sc_genid = genid;
2507 /*
2508 * Remove all disks without the biggest genid.
2509 */
2510 for (n = 0; n < sc->sc_ndisks; n++) {
2511 disk = &sc->sc_disks[n];
2512 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2513 continue;
2514 if (disk->d_genid < genid) {
2515 G_RAID3_DEBUG(0,
2516 "Component %s (device %s) broken, skipping.",
2517 g_raid3_get_diskname(disk), sc->sc_name);
2518 g_raid3_destroy_disk(disk);
2519 }
2520 }
2521
2522 /*
2523 * There must be at least 'sc->sc_ndisks - 1' components
2524 * with the same syncid and without SYNCHRONIZING flag.
2525 */
2526
2527 /*
2528 * Find the biggest syncid, number of valid components and
2529 * number of dirty components.
2530 */
2531 ndirty = ndisks = syncid = 0;
2532 for (n = 0; n < sc->sc_ndisks; n++) {
2533 disk = &sc->sc_disks[n];
2534 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2535 continue;
2536 if ((disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) != 0)
2537 ndirty++;
2538 if (disk->d_sync.ds_syncid > syncid) {
2539 syncid = disk->d_sync.ds_syncid;
2540 ndisks = 0;
2541 } else if (disk->d_sync.ds_syncid < syncid) {
2542 continue;
2543 }
2544 if ((disk->d_flags &
2545 G_RAID3_DISK_FLAG_SYNCHRONIZING) != 0) {
2546 continue;
2547 }
2548 ndisks++;
2549 }
2550 /*
2551 * Do we have enough valid components?
2552 */
2553 if (ndisks + 1 < sc->sc_ndisks) {
2554 G_RAID3_DEBUG(0,
2555 "Device %s is broken, too few valid components.",
2556 sc->sc_name);
2557 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2558 return;
2559 }
2560 /*
2561 * If there is one DIRTY component and all disks are present,
2562 * mark it for synchronization. If there is more than one DIRTY
2563 * component, mark parity component for synchronization.
2564 */
2565 if (ndisks == sc->sc_ndisks && ndirty == 1) {
2566 for (n = 0; n < sc->sc_ndisks; n++) {
2567 disk = &sc->sc_disks[n];
2568 if ((disk->d_flags &
2569 G_RAID3_DISK_FLAG_DIRTY) == 0) {
2570 continue;
2571 }
2572 disk->d_flags |=
2573 G_RAID3_DISK_FLAG_SYNCHRONIZING;
2574 }
2575 } else if (ndisks == sc->sc_ndisks && ndirty > 1) {
2576 disk = &sc->sc_disks[sc->sc_ndisks - 1];
2577 disk->d_flags |= G_RAID3_DISK_FLAG_SYNCHRONIZING;
2578 }
2579
2580 sc->sc_syncid = syncid;
2581 if (force) {
2582 /* Remember to bump syncid on first write. */
2583 sc->sc_bump_id |= G_RAID3_BUMP_SYNCID;
2584 }
2585 if (ndisks == sc->sc_ndisks)
2586 state = G_RAID3_DEVICE_STATE_COMPLETE;
2587 else /* if (ndisks == sc->sc_ndisks - 1) */
2588 state = G_RAID3_DEVICE_STATE_DEGRADED;
2589 G_RAID3_DEBUG(1, "Device %s state changed from %s to %s.",
2590 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2591 g_raid3_device_state2str(state));
2592 sc->sc_state = state;
2593 for (n = 0; n < sc->sc_ndisks; n++) {
2594 disk = &sc->sc_disks[n];
2595 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2596 continue;
2597 state = g_raid3_determine_state(disk);
2598 g_raid3_event_send(disk, state, G_RAID3_EVENT_DONTWAIT);
2599 if (state == G_RAID3_DISK_STATE_STALE)
2600 sc->sc_bump_id |= G_RAID3_BUMP_SYNCID;
2601 }
2602 break;
2603 }
2604 case G_RAID3_DEVICE_STATE_DEGRADED:
2605 /*
2606 * Genid need to be bumped immediately, so do it here.
2607 */
2608 if ((sc->sc_bump_id & G_RAID3_BUMP_GENID) != 0) {
2609 sc->sc_bump_id &= ~G_RAID3_BUMP_GENID;
2610 g_raid3_bump_genid(sc);
2611 }
2612
2613 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NEW) > 0)
2614 return;
2615 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) <
2616 sc->sc_ndisks - 1) {
2617 if (sc->sc_provider != NULL)
2618 g_raid3_destroy_provider(sc);
2619 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2620 return;
2621 }
2622 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) ==
2623 sc->sc_ndisks) {
2624 state = G_RAID3_DEVICE_STATE_COMPLETE;
2625 G_RAID3_DEBUG(1,
2626 "Device %s state changed from %s to %s.",
2627 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2628 g_raid3_device_state2str(state));
2629 sc->sc_state = state;
2630 }
2631 if (sc->sc_provider == NULL)
2632 g_raid3_launch_provider(sc);
2633 if (sc->sc_rootmount != NULL) {
2634 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2635 sc->sc_rootmount);
2636 root_mount_rel(sc->sc_rootmount);
2637 sc->sc_rootmount = NULL;
2638 }
2639 break;
2640 case G_RAID3_DEVICE_STATE_COMPLETE:
2641 /*
2642 * Genid need to be bumped immediately, so do it here.
2643 */
2644 if ((sc->sc_bump_id & G_RAID3_BUMP_GENID) != 0) {
2645 sc->sc_bump_id &= ~G_RAID3_BUMP_GENID;
2646 g_raid3_bump_genid(sc);
2647 }
2648
2649 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NEW) > 0)
2650 return;
2651 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) >=
2652 sc->sc_ndisks - 1,
2653 ("Too few ACTIVE components in COMPLETE state (device %s).",
2654 sc->sc_name));
2655 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) ==
2656 sc->sc_ndisks - 1) {
2657 state = G_RAID3_DEVICE_STATE_DEGRADED;
2658 G_RAID3_DEBUG(1,
2659 "Device %s state changed from %s to %s.",
2660 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2661 g_raid3_device_state2str(state));
2662 sc->sc_state = state;
2663 }
2664 if (sc->sc_provider == NULL)
2665 g_raid3_launch_provider(sc);
2666 if (sc->sc_rootmount != NULL) {
2667 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2668 sc->sc_rootmount);
2669 root_mount_rel(sc->sc_rootmount);
2670 sc->sc_rootmount = NULL;
2671 }
2672 break;
2673 default:
2674 KASSERT(1 == 0, ("Wrong device state (%s, %s).", sc->sc_name,
2675 g_raid3_device_state2str(sc->sc_state)));
2676 break;
2677 }
2678 }
2679
2680 /*
2681 * Update disk state and device state if needed.
2682 */
2683 #define DISK_STATE_CHANGED() G_RAID3_DEBUG(1, \
2684 "Disk %s state changed from %s to %s (device %s).", \
2685 g_raid3_get_diskname(disk), \
2686 g_raid3_disk_state2str(disk->d_state), \
2687 g_raid3_disk_state2str(state), sc->sc_name)
2688 static int
g_raid3_update_disk(struct g_raid3_disk * disk,u_int state)2689 g_raid3_update_disk(struct g_raid3_disk *disk, u_int state)
2690 {
2691 struct g_raid3_softc *sc;
2692
2693 sc = disk->d_softc;
2694 sx_assert(&sc->sc_lock, SX_XLOCKED);
2695
2696 again:
2697 G_RAID3_DEBUG(3, "Changing disk %s state from %s to %s.",
2698 g_raid3_get_diskname(disk), g_raid3_disk_state2str(disk->d_state),
2699 g_raid3_disk_state2str(state));
2700 switch (state) {
2701 case G_RAID3_DISK_STATE_NEW:
2702 /*
2703 * Possible scenarios:
2704 * 1. New disk arrive.
2705 */
2706 /* Previous state should be NONE. */
2707 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NONE,
2708 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2709 g_raid3_disk_state2str(disk->d_state)));
2710 DISK_STATE_CHANGED();
2711
2712 disk->d_state = state;
2713 G_RAID3_DEBUG(1, "Device %s: provider %s detected.",
2714 sc->sc_name, g_raid3_get_diskname(disk));
2715 if (sc->sc_state == G_RAID3_DEVICE_STATE_STARTING)
2716 break;
2717 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2718 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2719 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2720 g_raid3_device_state2str(sc->sc_state),
2721 g_raid3_get_diskname(disk),
2722 g_raid3_disk_state2str(disk->d_state)));
2723 state = g_raid3_determine_state(disk);
2724 if (state != G_RAID3_DISK_STATE_NONE)
2725 goto again;
2726 break;
2727 case G_RAID3_DISK_STATE_ACTIVE:
2728 /*
2729 * Possible scenarios:
2730 * 1. New disk does not need synchronization.
2731 * 2. Synchronization process finished successfully.
2732 */
2733 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2734 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2735 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2736 g_raid3_device_state2str(sc->sc_state),
2737 g_raid3_get_diskname(disk),
2738 g_raid3_disk_state2str(disk->d_state)));
2739 /* Previous state should be NEW or SYNCHRONIZING. */
2740 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW ||
2741 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2742 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2743 g_raid3_disk_state2str(disk->d_state)));
2744 DISK_STATE_CHANGED();
2745
2746 if (disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
2747 disk->d_flags &= ~G_RAID3_DISK_FLAG_SYNCHRONIZING;
2748 disk->d_flags &= ~G_RAID3_DISK_FLAG_FORCE_SYNC;
2749 g_raid3_sync_stop(sc, 0);
2750 }
2751 disk->d_state = state;
2752 disk->d_sync.ds_offset = 0;
2753 disk->d_sync.ds_offset_done = 0;
2754 g_raid3_update_idle(sc, disk);
2755 g_raid3_update_metadata(disk);
2756 G_RAID3_DEBUG(1, "Device %s: provider %s activated.",
2757 sc->sc_name, g_raid3_get_diskname(disk));
2758 break;
2759 case G_RAID3_DISK_STATE_STALE:
2760 /*
2761 * Possible scenarios:
2762 * 1. Stale disk was connected.
2763 */
2764 /* Previous state should be NEW. */
2765 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2766 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2767 g_raid3_disk_state2str(disk->d_state)));
2768 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2769 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2770 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2771 g_raid3_device_state2str(sc->sc_state),
2772 g_raid3_get_diskname(disk),
2773 g_raid3_disk_state2str(disk->d_state)));
2774 /*
2775 * STALE state is only possible if device is marked
2776 * NOAUTOSYNC.
2777 */
2778 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) != 0,
2779 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2780 g_raid3_device_state2str(sc->sc_state),
2781 g_raid3_get_diskname(disk),
2782 g_raid3_disk_state2str(disk->d_state)));
2783 DISK_STATE_CHANGED();
2784
2785 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2786 disk->d_state = state;
2787 g_raid3_update_metadata(disk);
2788 G_RAID3_DEBUG(0, "Device %s: provider %s is stale.",
2789 sc->sc_name, g_raid3_get_diskname(disk));
2790 break;
2791 case G_RAID3_DISK_STATE_SYNCHRONIZING:
2792 /*
2793 * Possible scenarios:
2794 * 1. Disk which needs synchronization was connected.
2795 */
2796 /* Previous state should be NEW. */
2797 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2798 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2799 g_raid3_disk_state2str(disk->d_state)));
2800 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2801 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2802 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2803 g_raid3_device_state2str(sc->sc_state),
2804 g_raid3_get_diskname(disk),
2805 g_raid3_disk_state2str(disk->d_state)));
2806 DISK_STATE_CHANGED();
2807
2808 if (disk->d_state == G_RAID3_DISK_STATE_NEW)
2809 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2810 disk->d_state = state;
2811 if (sc->sc_provider != NULL) {
2812 g_raid3_sync_start(sc);
2813 g_raid3_update_metadata(disk);
2814 }
2815 break;
2816 case G_RAID3_DISK_STATE_DISCONNECTED:
2817 /*
2818 * Possible scenarios:
2819 * 1. Device wasn't running yet, but disk disappear.
2820 * 2. Disk was active and disapppear.
2821 * 3. Disk disappear during synchronization process.
2822 */
2823 if (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2824 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
2825 /*
2826 * Previous state should be ACTIVE, STALE or
2827 * SYNCHRONIZING.
2828 */
2829 KASSERT(disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
2830 disk->d_state == G_RAID3_DISK_STATE_STALE ||
2831 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2832 ("Wrong disk state (%s, %s).",
2833 g_raid3_get_diskname(disk),
2834 g_raid3_disk_state2str(disk->d_state)));
2835 } else if (sc->sc_state == G_RAID3_DEVICE_STATE_STARTING) {
2836 /* Previous state should be NEW. */
2837 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2838 ("Wrong disk state (%s, %s).",
2839 g_raid3_get_diskname(disk),
2840 g_raid3_disk_state2str(disk->d_state)));
2841 /*
2842 * Reset bumping syncid if disk disappeared in STARTING
2843 * state.
2844 */
2845 if ((sc->sc_bump_id & G_RAID3_BUMP_SYNCID) != 0)
2846 sc->sc_bump_id &= ~G_RAID3_BUMP_SYNCID;
2847 #ifdef INVARIANTS
2848 } else {
2849 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2850 sc->sc_name,
2851 g_raid3_device_state2str(sc->sc_state),
2852 g_raid3_get_diskname(disk),
2853 g_raid3_disk_state2str(disk->d_state)));
2854 #endif
2855 }
2856 DISK_STATE_CHANGED();
2857 G_RAID3_DEBUG(0, "Device %s: provider %s disconnected.",
2858 sc->sc_name, g_raid3_get_diskname(disk));
2859
2860 g_raid3_destroy_disk(disk);
2861 break;
2862 default:
2863 KASSERT(1 == 0, ("Unknown state (%u).", state));
2864 break;
2865 }
2866 return (0);
2867 }
2868 #undef DISK_STATE_CHANGED
2869
2870 int
g_raid3_read_metadata(struct g_consumer * cp,struct g_raid3_metadata * md)2871 g_raid3_read_metadata(struct g_consumer *cp, struct g_raid3_metadata *md)
2872 {
2873 struct g_provider *pp;
2874 u_char *buf;
2875 int error;
2876
2877 g_topology_assert();
2878
2879 error = g_access(cp, 1, 0, 0);
2880 if (error != 0)
2881 return (error);
2882 pp = cp->provider;
2883 g_topology_unlock();
2884 /* Metadata are stored on last sector. */
2885 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2886 &error);
2887 g_topology_lock();
2888 g_access(cp, -1, 0, 0);
2889 if (buf == NULL) {
2890 G_RAID3_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2891 cp->provider->name, error);
2892 return (error);
2893 }
2894
2895 /* Decode metadata. */
2896 error = raid3_metadata_decode(buf, md);
2897 g_free(buf);
2898 if (strcmp(md->md_magic, G_RAID3_MAGIC) != 0)
2899 return (EINVAL);
2900 if (md->md_version > G_RAID3_VERSION) {
2901 G_RAID3_DEBUG(0,
2902 "Kernel module is too old to handle metadata from %s.",
2903 cp->provider->name);
2904 return (EINVAL);
2905 }
2906 if (error != 0) {
2907 G_RAID3_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2908 cp->provider->name);
2909 return (error);
2910 }
2911 if (md->md_sectorsize > MAXPHYS) {
2912 G_RAID3_DEBUG(0, "The blocksize is too big.");
2913 return (EINVAL);
2914 }
2915
2916 return (0);
2917 }
2918
2919 static int
g_raid3_check_metadata(struct g_raid3_softc * sc,struct g_provider * pp,struct g_raid3_metadata * md)2920 g_raid3_check_metadata(struct g_raid3_softc *sc, struct g_provider *pp,
2921 struct g_raid3_metadata *md)
2922 {
2923
2924 if (md->md_no >= sc->sc_ndisks) {
2925 G_RAID3_DEBUG(1, "Invalid disk %s number (no=%u), skipping.",
2926 pp->name, md->md_no);
2927 return (EINVAL);
2928 }
2929 if (sc->sc_disks[md->md_no].d_state != G_RAID3_DISK_STATE_NODISK) {
2930 G_RAID3_DEBUG(1, "Disk %s (no=%u) already exists, skipping.",
2931 pp->name, md->md_no);
2932 return (EEXIST);
2933 }
2934 if (md->md_all != sc->sc_ndisks) {
2935 G_RAID3_DEBUG(1,
2936 "Invalid '%s' field on disk %s (device %s), skipping.",
2937 "md_all", pp->name, sc->sc_name);
2938 return (EINVAL);
2939 }
2940 if ((md->md_mediasize % md->md_sectorsize) != 0) {
2941 G_RAID3_DEBUG(1, "Invalid metadata (mediasize %% sectorsize != "
2942 "0) on disk %s (device %s), skipping.", pp->name,
2943 sc->sc_name);
2944 return (EINVAL);
2945 }
2946 if (md->md_mediasize != sc->sc_mediasize) {
2947 G_RAID3_DEBUG(1,
2948 "Invalid '%s' field on disk %s (device %s), skipping.",
2949 "md_mediasize", pp->name, sc->sc_name);
2950 return (EINVAL);
2951 }
2952 if ((md->md_mediasize % (sc->sc_ndisks - 1)) != 0) {
2953 G_RAID3_DEBUG(1,
2954 "Invalid '%s' field on disk %s (device %s), skipping.",
2955 "md_mediasize", pp->name, sc->sc_name);
2956 return (EINVAL);
2957 }
2958 if ((sc->sc_mediasize / (sc->sc_ndisks - 1)) > pp->mediasize) {
2959 G_RAID3_DEBUG(1,
2960 "Invalid size of disk %s (device %s), skipping.", pp->name,
2961 sc->sc_name);
2962 return (EINVAL);
2963 }
2964 if ((md->md_sectorsize / pp->sectorsize) < sc->sc_ndisks - 1) {
2965 G_RAID3_DEBUG(1,
2966 "Invalid '%s' field on disk %s (device %s), skipping.",
2967 "md_sectorsize", pp->name, sc->sc_name);
2968 return (EINVAL);
2969 }
2970 if (md->md_sectorsize != sc->sc_sectorsize) {
2971 G_RAID3_DEBUG(1,
2972 "Invalid '%s' field on disk %s (device %s), skipping.",
2973 "md_sectorsize", pp->name, sc->sc_name);
2974 return (EINVAL);
2975 }
2976 if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
2977 G_RAID3_DEBUG(1,
2978 "Invalid sector size of disk %s (device %s), skipping.",
2979 pp->name, sc->sc_name);
2980 return (EINVAL);
2981 }
2982 if ((md->md_mflags & ~G_RAID3_DEVICE_FLAG_MASK) != 0) {
2983 G_RAID3_DEBUG(1,
2984 "Invalid device flags on disk %s (device %s), skipping.",
2985 pp->name, sc->sc_name);
2986 return (EINVAL);
2987 }
2988 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_VERIFY) != 0 &&
2989 (md->md_mflags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0) {
2990 /*
2991 * VERIFY and ROUND-ROBIN options are mutally exclusive.
2992 */
2993 G_RAID3_DEBUG(1, "Both VERIFY and ROUND-ROBIN flags exist on "
2994 "disk %s (device %s), skipping.", pp->name, sc->sc_name);
2995 return (EINVAL);
2996 }
2997 if ((md->md_dflags & ~G_RAID3_DISK_FLAG_MASK) != 0) {
2998 G_RAID3_DEBUG(1,
2999 "Invalid disk flags on disk %s (device %s), skipping.",
3000 pp->name, sc->sc_name);
3001 return (EINVAL);
3002 }
3003 return (0);
3004 }
3005
3006 int
g_raid3_add_disk(struct g_raid3_softc * sc,struct g_provider * pp,struct g_raid3_metadata * md)3007 g_raid3_add_disk(struct g_raid3_softc *sc, struct g_provider *pp,
3008 struct g_raid3_metadata *md)
3009 {
3010 struct g_raid3_disk *disk;
3011 int error;
3012
3013 g_topology_assert_not();
3014 G_RAID3_DEBUG(2, "Adding disk %s.", pp->name);
3015
3016 error = g_raid3_check_metadata(sc, pp, md);
3017 if (error != 0)
3018 return (error);
3019 if (sc->sc_state != G_RAID3_DEVICE_STATE_STARTING &&
3020 md->md_genid < sc->sc_genid) {
3021 G_RAID3_DEBUG(0, "Component %s (device %s) broken, skipping.",
3022 pp->name, sc->sc_name);
3023 return (EINVAL);
3024 }
3025 disk = g_raid3_init_disk(sc, pp, md, &error);
3026 if (disk == NULL)
3027 return (error);
3028 error = g_raid3_event_send(disk, G_RAID3_DISK_STATE_NEW,
3029 G_RAID3_EVENT_WAIT);
3030 if (error != 0)
3031 return (error);
3032 if (md->md_version < G_RAID3_VERSION) {
3033 G_RAID3_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
3034 pp->name, md->md_version, G_RAID3_VERSION);
3035 g_raid3_update_metadata(disk);
3036 }
3037 return (0);
3038 }
3039
3040 static void
g_raid3_destroy_delayed(void * arg,int flag)3041 g_raid3_destroy_delayed(void *arg, int flag)
3042 {
3043 struct g_raid3_softc *sc;
3044 int error;
3045
3046 if (flag == EV_CANCEL) {
3047 G_RAID3_DEBUG(1, "Destroying canceled.");
3048 return;
3049 }
3050 sc = arg;
3051 g_topology_unlock();
3052 sx_xlock(&sc->sc_lock);
3053 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) == 0,
3054 ("DESTROY flag set on %s.", sc->sc_name));
3055 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROYING) != 0,
3056 ("DESTROYING flag not set on %s.", sc->sc_name));
3057 G_RAID3_DEBUG(0, "Destroying %s (delayed).", sc->sc_name);
3058 error = g_raid3_destroy(sc, G_RAID3_DESTROY_SOFT);
3059 if (error != 0) {
3060 G_RAID3_DEBUG(0, "Cannot destroy %s.", sc->sc_name);
3061 sx_xunlock(&sc->sc_lock);
3062 }
3063 g_topology_lock();
3064 }
3065
3066 static int
g_raid3_access(struct g_provider * pp,int acr,int acw,int ace)3067 g_raid3_access(struct g_provider *pp, int acr, int acw, int ace)
3068 {
3069 struct g_raid3_softc *sc;
3070 int dcr, dcw, dce, error = 0;
3071
3072 g_topology_assert();
3073 G_RAID3_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
3074 acw, ace);
3075
3076 sc = pp->geom->softc;
3077 if (sc == NULL && acr <= 0 && acw <= 0 && ace <= 0)
3078 return (0);
3079 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
3080
3081 dcr = pp->acr + acr;
3082 dcw = pp->acw + acw;
3083 dce = pp->ace + ace;
3084
3085 g_topology_unlock();
3086 sx_xlock(&sc->sc_lock);
3087 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0 ||
3088 g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) < sc->sc_ndisks - 1) {
3089 if (acr > 0 || acw > 0 || ace > 0)
3090 error = ENXIO;
3091 goto end;
3092 }
3093 if (dcw == 0)
3094 g_raid3_idle(sc, dcw);
3095 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROYING) != 0) {
3096 if (acr > 0 || acw > 0 || ace > 0) {
3097 error = ENXIO;
3098 goto end;
3099 }
3100 if (dcr == 0 && dcw == 0 && dce == 0) {
3101 g_post_event(g_raid3_destroy_delayed, sc, M_WAITOK,
3102 sc, NULL);
3103 }
3104 }
3105 end:
3106 sx_xunlock(&sc->sc_lock);
3107 g_topology_lock();
3108 return (error);
3109 }
3110
3111 static struct g_geom *
g_raid3_create(struct g_class * mp,const struct g_raid3_metadata * md)3112 g_raid3_create(struct g_class *mp, const struct g_raid3_metadata *md)
3113 {
3114 struct g_raid3_softc *sc;
3115 struct g_geom *gp;
3116 int error, timeout;
3117 u_int n;
3118
3119 g_topology_assert();
3120 G_RAID3_DEBUG(1, "Creating device %s (id=%u).", md->md_name, md->md_id);
3121
3122 /* One disk is minimum. */
3123 if (md->md_all < 1)
3124 return (NULL);
3125 /*
3126 * Action geom.
3127 */
3128 gp = g_new_geomf(mp, "%s", md->md_name);
3129 sc = malloc(sizeof(*sc), M_RAID3, M_WAITOK | M_ZERO);
3130 sc->sc_disks = malloc(sizeof(struct g_raid3_disk) * md->md_all, M_RAID3,
3131 M_WAITOK | M_ZERO);
3132 gp->start = g_raid3_start;
3133 gp->orphan = g_raid3_orphan;
3134 gp->access = g_raid3_access;
3135 gp->dumpconf = g_raid3_dumpconf;
3136
3137 sc->sc_id = md->md_id;
3138 sc->sc_mediasize = md->md_mediasize;
3139 sc->sc_sectorsize = md->md_sectorsize;
3140 sc->sc_ndisks = md->md_all;
3141 sc->sc_round_robin = 0;
3142 sc->sc_flags = md->md_mflags;
3143 sc->sc_bump_id = 0;
3144 sc->sc_idle = 1;
3145 sc->sc_last_write = time_uptime;
3146 sc->sc_writes = 0;
3147 for (n = 0; n < sc->sc_ndisks; n++) {
3148 sc->sc_disks[n].d_softc = sc;
3149 sc->sc_disks[n].d_no = n;
3150 sc->sc_disks[n].d_state = G_RAID3_DISK_STATE_NODISK;
3151 }
3152 sx_init(&sc->sc_lock, "graid3:lock");
3153 bioq_init(&sc->sc_queue);
3154 mtx_init(&sc->sc_queue_mtx, "graid3:queue", NULL, MTX_DEF);
3155 bioq_init(&sc->sc_regular_delayed);
3156 bioq_init(&sc->sc_inflight);
3157 bioq_init(&sc->sc_sync_delayed);
3158 TAILQ_INIT(&sc->sc_events);
3159 mtx_init(&sc->sc_events_mtx, "graid3:events", NULL, MTX_DEF);
3160 callout_init(&sc->sc_callout, 1);
3161 sc->sc_state = G_RAID3_DEVICE_STATE_STARTING;
3162 gp->softc = sc;
3163 sc->sc_geom = gp;
3164 sc->sc_provider = NULL;
3165 /*
3166 * Synchronization geom.
3167 */
3168 gp = g_new_geomf(mp, "%s.sync", md->md_name);
3169 gp->softc = sc;
3170 gp->orphan = g_raid3_orphan;
3171 sc->sc_sync.ds_geom = gp;
3172
3173 if (!g_raid3_use_malloc) {
3174 sc->sc_zones[G_RAID3_ZONE_64K].sz_zone = uma_zcreate("gr3:64k",
3175 65536, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3176 UMA_ALIGN_PTR, 0);
3177 sc->sc_zones[G_RAID3_ZONE_64K].sz_inuse = 0;
3178 sc->sc_zones[G_RAID3_ZONE_64K].sz_max = g_raid3_n64k;
3179 sc->sc_zones[G_RAID3_ZONE_64K].sz_requested =
3180 sc->sc_zones[G_RAID3_ZONE_64K].sz_failed = 0;
3181 sc->sc_zones[G_RAID3_ZONE_16K].sz_zone = uma_zcreate("gr3:16k",
3182 16384, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3183 UMA_ALIGN_PTR, 0);
3184 sc->sc_zones[G_RAID3_ZONE_16K].sz_inuse = 0;
3185 sc->sc_zones[G_RAID3_ZONE_16K].sz_max = g_raid3_n16k;
3186 sc->sc_zones[G_RAID3_ZONE_16K].sz_requested =
3187 sc->sc_zones[G_RAID3_ZONE_16K].sz_failed = 0;
3188 sc->sc_zones[G_RAID3_ZONE_4K].sz_zone = uma_zcreate("gr3:4k",
3189 4096, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3190 UMA_ALIGN_PTR, 0);
3191 sc->sc_zones[G_RAID3_ZONE_4K].sz_inuse = 0;
3192 sc->sc_zones[G_RAID3_ZONE_4K].sz_max = g_raid3_n4k;
3193 sc->sc_zones[G_RAID3_ZONE_4K].sz_requested =
3194 sc->sc_zones[G_RAID3_ZONE_4K].sz_failed = 0;
3195 }
3196
3197 error = kproc_create(g_raid3_worker, sc, &sc->sc_worker, 0, 0,
3198 "g_raid3 %s", md->md_name);
3199 if (error != 0) {
3200 G_RAID3_DEBUG(1, "Cannot create kernel thread for %s.",
3201 sc->sc_name);
3202 if (!g_raid3_use_malloc) {
3203 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_64K].sz_zone);
3204 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_16K].sz_zone);
3205 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_4K].sz_zone);
3206 }
3207 g_destroy_geom(sc->sc_sync.ds_geom);
3208 mtx_destroy(&sc->sc_events_mtx);
3209 mtx_destroy(&sc->sc_queue_mtx);
3210 sx_destroy(&sc->sc_lock);
3211 g_destroy_geom(sc->sc_geom);
3212 free(sc->sc_disks, M_RAID3);
3213 free(sc, M_RAID3);
3214 return (NULL);
3215 }
3216
3217 G_RAID3_DEBUG(1, "Device %s created (%u components, id=%u).",
3218 sc->sc_name, sc->sc_ndisks, sc->sc_id);
3219
3220 sc->sc_rootmount = root_mount_hold("GRAID3");
3221 G_RAID3_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
3222
3223 /*
3224 * Run timeout.
3225 */
3226 timeout = atomic_load_acq_int(&g_raid3_timeout);
3227 callout_reset(&sc->sc_callout, timeout * hz, g_raid3_go, sc);
3228 return (sc->sc_geom);
3229 }
3230
3231 int
g_raid3_destroy(struct g_raid3_softc * sc,int how)3232 g_raid3_destroy(struct g_raid3_softc *sc, int how)
3233 {
3234 struct g_provider *pp;
3235
3236 g_topology_assert_not();
3237 if (sc == NULL)
3238 return (ENXIO);
3239 sx_assert(&sc->sc_lock, SX_XLOCKED);
3240
3241 pp = sc->sc_provider;
3242 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
3243 switch (how) {
3244 case G_RAID3_DESTROY_SOFT:
3245 G_RAID3_DEBUG(1,
3246 "Device %s is still open (r%dw%de%d).", pp->name,
3247 pp->acr, pp->acw, pp->ace);
3248 return (EBUSY);
3249 case G_RAID3_DESTROY_DELAYED:
3250 G_RAID3_DEBUG(1,
3251 "Device %s will be destroyed on last close.",
3252 pp->name);
3253 if (sc->sc_syncdisk != NULL)
3254 g_raid3_sync_stop(sc, 1);
3255 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROYING;
3256 return (EBUSY);
3257 case G_RAID3_DESTROY_HARD:
3258 G_RAID3_DEBUG(1, "Device %s is still open, so it "
3259 "can't be definitely removed.", pp->name);
3260 break;
3261 }
3262 }
3263
3264 g_topology_lock();
3265 if (sc->sc_geom->softc == NULL) {
3266 g_topology_unlock();
3267 return (0);
3268 }
3269 sc->sc_geom->softc = NULL;
3270 sc->sc_sync.ds_geom->softc = NULL;
3271 g_topology_unlock();
3272
3273 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
3274 sc->sc_flags |= G_RAID3_DEVICE_FLAG_WAIT;
3275 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
3276 sx_xunlock(&sc->sc_lock);
3277 mtx_lock(&sc->sc_queue_mtx);
3278 wakeup(sc);
3279 wakeup(&sc->sc_queue);
3280 mtx_unlock(&sc->sc_queue_mtx);
3281 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
3282 while (sc->sc_worker != NULL)
3283 tsleep(&sc->sc_worker, PRIBIO, "r3:destroy", hz / 5);
3284 G_RAID3_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
3285 sx_xlock(&sc->sc_lock);
3286 g_raid3_destroy_device(sc);
3287 free(sc->sc_disks, M_RAID3);
3288 free(sc, M_RAID3);
3289 return (0);
3290 }
3291
3292 static void
g_raid3_taste_orphan(struct g_consumer * cp)3293 g_raid3_taste_orphan(struct g_consumer *cp)
3294 {
3295
3296 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
3297 cp->provider->name));
3298 }
3299
3300 static struct g_geom *
g_raid3_taste(struct g_class * mp,struct g_provider * pp,int flags __unused)3301 g_raid3_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
3302 {
3303 struct g_raid3_metadata md;
3304 struct g_raid3_softc *sc;
3305 struct g_consumer *cp;
3306 struct g_geom *gp;
3307 int error;
3308
3309 g_topology_assert();
3310 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
3311 G_RAID3_DEBUG(2, "Tasting %s.", pp->name);
3312
3313 gp = g_new_geomf(mp, "raid3:taste");
3314 /* This orphan function should be never called. */
3315 gp->orphan = g_raid3_taste_orphan;
3316 cp = g_new_consumer(gp);
3317 g_attach(cp, pp);
3318 error = g_raid3_read_metadata(cp, &md);
3319 g_detach(cp);
3320 g_destroy_consumer(cp);
3321 g_destroy_geom(gp);
3322 if (error != 0)
3323 return (NULL);
3324 gp = NULL;
3325
3326 if (md.md_provider[0] != '\0' &&
3327 !g_compare_names(md.md_provider, pp->name))
3328 return (NULL);
3329 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
3330 return (NULL);
3331 if (g_raid3_debug >= 2)
3332 raid3_metadata_dump(&md);
3333
3334 /*
3335 * Let's check if device already exists.
3336 */
3337 sc = NULL;
3338 LIST_FOREACH(gp, &mp->geom, geom) {
3339 sc = gp->softc;
3340 if (sc == NULL)
3341 continue;
3342 if (sc->sc_sync.ds_geom == gp)
3343 continue;
3344 if (strcmp(md.md_name, sc->sc_name) != 0)
3345 continue;
3346 if (md.md_id != sc->sc_id) {
3347 G_RAID3_DEBUG(0, "Device %s already configured.",
3348 sc->sc_name);
3349 return (NULL);
3350 }
3351 break;
3352 }
3353 if (gp == NULL) {
3354 gp = g_raid3_create(mp, &md);
3355 if (gp == NULL) {
3356 G_RAID3_DEBUG(0, "Cannot create device %s.",
3357 md.md_name);
3358 return (NULL);
3359 }
3360 sc = gp->softc;
3361 }
3362 G_RAID3_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
3363 g_topology_unlock();
3364 sx_xlock(&sc->sc_lock);
3365 error = g_raid3_add_disk(sc, pp, &md);
3366 if (error != 0) {
3367 G_RAID3_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
3368 pp->name, gp->name, error);
3369 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NODISK) ==
3370 sc->sc_ndisks) {
3371 g_cancel_event(sc);
3372 g_raid3_destroy(sc, G_RAID3_DESTROY_HARD);
3373 g_topology_lock();
3374 return (NULL);
3375 }
3376 gp = NULL;
3377 }
3378 sx_xunlock(&sc->sc_lock);
3379 g_topology_lock();
3380 return (gp);
3381 }
3382
3383 static int
g_raid3_destroy_geom(struct gctl_req * req __unused,struct g_class * mp __unused,struct g_geom * gp)3384 g_raid3_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
3385 struct g_geom *gp)
3386 {
3387 struct g_raid3_softc *sc;
3388 int error;
3389
3390 g_topology_unlock();
3391 sc = gp->softc;
3392 sx_xlock(&sc->sc_lock);
3393 g_cancel_event(sc);
3394 error = g_raid3_destroy(gp->softc, G_RAID3_DESTROY_SOFT);
3395 if (error != 0)
3396 sx_xunlock(&sc->sc_lock);
3397 g_topology_lock();
3398 return (error);
3399 }
3400
3401 static void
g_raid3_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp,struct g_provider * pp)3402 g_raid3_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
3403 struct g_consumer *cp, struct g_provider *pp)
3404 {
3405 struct g_raid3_softc *sc;
3406
3407 g_topology_assert();
3408
3409 sc = gp->softc;
3410 if (sc == NULL)
3411 return;
3412 /* Skip synchronization geom. */
3413 if (gp == sc->sc_sync.ds_geom)
3414 return;
3415 if (pp != NULL) {
3416 /* Nothing here. */
3417 } else if (cp != NULL) {
3418 struct g_raid3_disk *disk;
3419
3420 disk = cp->private;
3421 if (disk == NULL)
3422 return;
3423 g_topology_unlock();
3424 sx_xlock(&sc->sc_lock);
3425 sbuf_printf(sb, "%s<Type>", indent);
3426 if (disk->d_no == sc->sc_ndisks - 1)
3427 sbuf_cat(sb, "PARITY");
3428 else
3429 sbuf_cat(sb, "DATA");
3430 sbuf_cat(sb, "</Type>\n");
3431 sbuf_printf(sb, "%s<Number>%u</Number>\n", indent,
3432 (u_int)disk->d_no);
3433 if (disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
3434 sbuf_printf(sb, "%s<Synchronized>", indent);
3435 if (disk->d_sync.ds_offset == 0)
3436 sbuf_cat(sb, "0%");
3437 else {
3438 sbuf_printf(sb, "%u%%",
3439 (u_int)((disk->d_sync.ds_offset * 100) /
3440 (sc->sc_mediasize / (sc->sc_ndisks - 1))));
3441 }
3442 sbuf_cat(sb, "</Synchronized>\n");
3443 if (disk->d_sync.ds_offset > 0) {
3444 sbuf_printf(sb, "%s<BytesSynced>%jd"
3445 "</BytesSynced>\n", indent,
3446 (intmax_t)disk->d_sync.ds_offset);
3447 }
3448 }
3449 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
3450 disk->d_sync.ds_syncid);
3451 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, disk->d_genid);
3452 sbuf_printf(sb, "%s<Flags>", indent);
3453 if (disk->d_flags == 0)
3454 sbuf_cat(sb, "NONE");
3455 else {
3456 int first = 1;
3457
3458 #define ADD_FLAG(flag, name) do { \
3459 if ((disk->d_flags & (flag)) != 0) { \
3460 if (!first) \
3461 sbuf_cat(sb, ", "); \
3462 else \
3463 first = 0; \
3464 sbuf_cat(sb, name); \
3465 } \
3466 } while (0)
3467 ADD_FLAG(G_RAID3_DISK_FLAG_DIRTY, "DIRTY");
3468 ADD_FLAG(G_RAID3_DISK_FLAG_HARDCODED, "HARDCODED");
3469 ADD_FLAG(G_RAID3_DISK_FLAG_SYNCHRONIZING,
3470 "SYNCHRONIZING");
3471 ADD_FLAG(G_RAID3_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
3472 ADD_FLAG(G_RAID3_DISK_FLAG_BROKEN, "BROKEN");
3473 #undef ADD_FLAG
3474 }
3475 sbuf_cat(sb, "</Flags>\n");
3476 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3477 g_raid3_disk_state2str(disk->d_state));
3478 sx_xunlock(&sc->sc_lock);
3479 g_topology_lock();
3480 } else {
3481 g_topology_unlock();
3482 sx_xlock(&sc->sc_lock);
3483 if (!g_raid3_use_malloc) {
3484 sbuf_printf(sb,
3485 "%s<Zone4kRequested>%u</Zone4kRequested>\n", indent,
3486 sc->sc_zones[G_RAID3_ZONE_4K].sz_requested);
3487 sbuf_printf(sb,
3488 "%s<Zone4kFailed>%u</Zone4kFailed>\n", indent,
3489 sc->sc_zones[G_RAID3_ZONE_4K].sz_failed);
3490 sbuf_printf(sb,
3491 "%s<Zone16kRequested>%u</Zone16kRequested>\n", indent,
3492 sc->sc_zones[G_RAID3_ZONE_16K].sz_requested);
3493 sbuf_printf(sb,
3494 "%s<Zone16kFailed>%u</Zone16kFailed>\n", indent,
3495 sc->sc_zones[G_RAID3_ZONE_16K].sz_failed);
3496 sbuf_printf(sb,
3497 "%s<Zone64kRequested>%u</Zone64kRequested>\n", indent,
3498 sc->sc_zones[G_RAID3_ZONE_64K].sz_requested);
3499 sbuf_printf(sb,
3500 "%s<Zone64kFailed>%u</Zone64kFailed>\n", indent,
3501 sc->sc_zones[G_RAID3_ZONE_64K].sz_failed);
3502 }
3503 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
3504 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
3505 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
3506 sbuf_printf(sb, "%s<Flags>", indent);
3507 if (sc->sc_flags == 0)
3508 sbuf_cat(sb, "NONE");
3509 else {
3510 int first = 1;
3511
3512 #define ADD_FLAG(flag, name) do { \
3513 if ((sc->sc_flags & (flag)) != 0) { \
3514 if (!first) \
3515 sbuf_cat(sb, ", "); \
3516 else \
3517 first = 0; \
3518 sbuf_cat(sb, name); \
3519 } \
3520 } while (0)
3521 ADD_FLAG(G_RAID3_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
3522 ADD_FLAG(G_RAID3_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
3523 ADD_FLAG(G_RAID3_DEVICE_FLAG_ROUND_ROBIN,
3524 "ROUND-ROBIN");
3525 ADD_FLAG(G_RAID3_DEVICE_FLAG_VERIFY, "VERIFY");
3526 #undef ADD_FLAG
3527 }
3528 sbuf_cat(sb, "</Flags>\n");
3529 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
3530 sc->sc_ndisks);
3531 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3532 g_raid3_device_state2str(sc->sc_state));
3533 sx_xunlock(&sc->sc_lock);
3534 g_topology_lock();
3535 }
3536 }
3537
3538 static void
g_raid3_shutdown_post_sync(void * arg,int howto)3539 g_raid3_shutdown_post_sync(void *arg, int howto)
3540 {
3541 struct g_class *mp;
3542 struct g_geom *gp, *gp2;
3543 struct g_raid3_softc *sc;
3544 int error;
3545
3546 mp = arg;
3547 g_topology_lock();
3548 g_raid3_shutdown = 1;
3549 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
3550 if ((sc = gp->softc) == NULL)
3551 continue;
3552 /* Skip synchronization geom. */
3553 if (gp == sc->sc_sync.ds_geom)
3554 continue;
3555 g_topology_unlock();
3556 sx_xlock(&sc->sc_lock);
3557 g_raid3_idle(sc, -1);
3558 g_cancel_event(sc);
3559 error = g_raid3_destroy(sc, G_RAID3_DESTROY_DELAYED);
3560 if (error != 0)
3561 sx_xunlock(&sc->sc_lock);
3562 g_topology_lock();
3563 }
3564 g_topology_unlock();
3565 }
3566
3567 static void
g_raid3_init(struct g_class * mp)3568 g_raid3_init(struct g_class *mp)
3569 {
3570
3571 g_raid3_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync,
3572 g_raid3_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST);
3573 if (g_raid3_post_sync == NULL)
3574 G_RAID3_DEBUG(0, "Warning! Cannot register shutdown event.");
3575 }
3576
3577 static void
g_raid3_fini(struct g_class * mp)3578 g_raid3_fini(struct g_class *mp)
3579 {
3580
3581 if (g_raid3_post_sync != NULL)
3582 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_raid3_post_sync);
3583 }
3584
3585 DECLARE_GEOM_CLASS(g_raid3_class, g_raid3);
3586 MODULE_VERSION(geom_raid3, 0);
3587