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