1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/bio.h>
32 #include <sys/eventhandler.h>
33 #include <sys/kernel.h>
34 #include <sys/kthread.h>
35 #include <sys/limits.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
40 #include <sys/proc.h>
41 #include <sys/reboot.h>
42 #include <sys/sbuf.h>
43 #include <sys/sched.h>
44 #include <sys/sysctl.h>
45
46 #include <vm/uma.h>
47
48 #include <geom/geom.h>
49 #include <geom/geom_dbg.h>
50 #include <geom/raid3/g_raid3.h>
51
52 FEATURE(geom_raid3, "GEOM RAID-3 functionality");
53
54 static MALLOC_DEFINE(M_RAID3, "raid3_data", "GEOM_RAID3 Data");
55
56 SYSCTL_DECL(_kern_geom);
57 static SYSCTL_NODE(_kern_geom, OID_AUTO, raid3, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
58 "GEOM_RAID3 stuff");
59 u_int g_raid3_debug = 0;
60 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, debug, CTLFLAG_RWTUN, &g_raid3_debug, 0,
61 "Debug level");
62 static u_int g_raid3_timeout = 4;
63 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, timeout, CTLFLAG_RWTUN, &g_raid3_timeout,
64 0, "Time to wait on all raid3 components");
65 static u_int g_raid3_idletime = 5;
66 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, idletime, CTLFLAG_RWTUN,
67 &g_raid3_idletime, 0, "Mark components as clean when idling");
68 static u_int g_raid3_disconnect_on_failure = 1;
69 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, disconnect_on_failure, CTLFLAG_RWTUN,
70 &g_raid3_disconnect_on_failure, 0, "Disconnect component on I/O failure.");
71 static u_int g_raid3_syncreqs = 2;
72 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, sync_requests, CTLFLAG_RDTUN,
73 &g_raid3_syncreqs, 0, "Parallel synchronization I/O requests.");
74 static u_int g_raid3_use_malloc = 0;
75 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, use_malloc, CTLFLAG_RDTUN,
76 &g_raid3_use_malloc, 0, "Use malloc(9) instead of uma(9).");
77
78 static u_int g_raid3_n64k = 50;
79 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n64k, CTLFLAG_RDTUN, &g_raid3_n64k, 0,
80 "Maximum number of 64kB allocations");
81 static u_int g_raid3_n16k = 200;
82 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n16k, CTLFLAG_RDTUN, &g_raid3_n16k, 0,
83 "Maximum number of 16kB allocations");
84 static u_int g_raid3_n4k = 1200;
85 SYSCTL_UINT(_kern_geom_raid3, OID_AUTO, n4k, CTLFLAG_RDTUN, &g_raid3_n4k, 0,
86 "Maximum number of 4kB allocations");
87
88 static SYSCTL_NODE(_kern_geom_raid3, OID_AUTO, stat,
89 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
90 "GEOM_RAID3 statistics");
91 static u_int g_raid3_parity_mismatch = 0;
92 SYSCTL_UINT(_kern_geom_raid3_stat, OID_AUTO, parity_mismatch, CTLFLAG_RD,
93 &g_raid3_parity_mismatch, 0, "Number of failures in VERIFY mode");
94
95 #define MSLEEP(ident, mtx, priority, wmesg, timeout) do { \
96 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
97 msleep((ident), (mtx), (priority), (wmesg), (timeout)); \
98 G_RAID3_DEBUG(4, "%s: Woken up %p.", __func__, (ident)); \
99 } while (0)
100
101 static eventhandler_tag g_raid3_post_sync = NULL;
102 static int g_raid3_shutdown = 0;
103
104 static int g_raid3_destroy_geom(struct gctl_req *req, struct g_class *mp,
105 struct g_geom *gp);
106 static g_taste_t g_raid3_taste;
107 static void g_raid3_init(struct g_class *mp);
108 static void g_raid3_fini(struct g_class *mp);
109 static void g_raid3_providergone(struct g_provider *pp);
110
111 struct g_class g_raid3_class = {
112 .name = G_RAID3_CLASS_NAME,
113 .version = G_VERSION,
114 .ctlreq = g_raid3_config,
115 .taste = g_raid3_taste,
116 .destroy_geom = g_raid3_destroy_geom,
117 .init = g_raid3_init,
118 .fini = g_raid3_fini,
119 .providergone = g_raid3_providergone,
120 };
121
122 static void g_raid3_destroy_provider(struct g_raid3_softc *sc);
123 static int g_raid3_update_disk(struct g_raid3_disk *disk, u_int state);
124 static void g_raid3_update_device(struct g_raid3_softc *sc, boolean_t force);
125 static void g_raid3_dumpconf(struct sbuf *sb, const char *indent,
126 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
127 static void g_raid3_sync_stop(struct g_raid3_softc *sc, int type);
128 static int g_raid3_register_request(struct bio *pbp);
129 static void g_raid3_sync_release(struct g_raid3_softc *sc);
130 static void g_raid3_timeout_drain(struct g_raid3_softc *sc);
131
132 static const char *
g_raid3_disk_state2str(int state)133 g_raid3_disk_state2str(int state)
134 {
135
136 switch (state) {
137 case G_RAID3_DISK_STATE_NODISK:
138 return ("NODISK");
139 case G_RAID3_DISK_STATE_NONE:
140 return ("NONE");
141 case G_RAID3_DISK_STATE_NEW:
142 return ("NEW");
143 case G_RAID3_DISK_STATE_ACTIVE:
144 return ("ACTIVE");
145 case G_RAID3_DISK_STATE_STALE:
146 return ("STALE");
147 case G_RAID3_DISK_STATE_SYNCHRONIZING:
148 return ("SYNCHRONIZING");
149 case G_RAID3_DISK_STATE_DISCONNECTED:
150 return ("DISCONNECTED");
151 default:
152 return ("INVALID");
153 }
154 }
155
156 static const char *
g_raid3_device_state2str(int state)157 g_raid3_device_state2str(int state)
158 {
159
160 switch (state) {
161 case G_RAID3_DEVICE_STATE_STARTING:
162 return ("STARTING");
163 case G_RAID3_DEVICE_STATE_DEGRADED:
164 return ("DEGRADED");
165 case G_RAID3_DEVICE_STATE_COMPLETE:
166 return ("COMPLETE");
167 default:
168 return ("INVALID");
169 }
170 }
171
172 const char *
g_raid3_get_diskname(struct g_raid3_disk * disk)173 g_raid3_get_diskname(struct g_raid3_disk *disk)
174 {
175
176 if (disk->d_consumer == NULL || disk->d_consumer->provider == NULL)
177 return ("[unknown]");
178 return (disk->d_name);
179 }
180
181 static void *
g_raid3_alloc(struct g_raid3_softc * sc,size_t size,int flags)182 g_raid3_alloc(struct g_raid3_softc *sc, size_t size, int flags)
183 {
184 void *ptr;
185 enum g_raid3_zones zone;
186
187 if (g_raid3_use_malloc ||
188 (zone = g_raid3_zone(size)) == G_RAID3_NUM_ZONES)
189 ptr = malloc(size, M_RAID3, flags);
190 else {
191 ptr = uma_zalloc_arg(sc->sc_zones[zone].sz_zone,
192 &sc->sc_zones[zone], flags);
193 sc->sc_zones[zone].sz_requested++;
194 if (ptr == NULL)
195 sc->sc_zones[zone].sz_failed++;
196 }
197 return (ptr);
198 }
199
200 static void
g_raid3_free(struct g_raid3_softc * sc,void * ptr,size_t size)201 g_raid3_free(struct g_raid3_softc *sc, void *ptr, size_t size)
202 {
203 enum g_raid3_zones zone;
204
205 if (g_raid3_use_malloc ||
206 (zone = g_raid3_zone(size)) == G_RAID3_NUM_ZONES)
207 free(ptr, M_RAID3);
208 else {
209 uma_zfree_arg(sc->sc_zones[zone].sz_zone,
210 ptr, &sc->sc_zones[zone]);
211 }
212 }
213
214 static int
g_raid3_uma_ctor(void * mem,int size,void * arg,int flags)215 g_raid3_uma_ctor(void *mem, int size, void *arg, int flags)
216 {
217 struct g_raid3_zone *sz = arg;
218
219 if (sz->sz_max > 0 && sz->sz_inuse == sz->sz_max)
220 return (ENOMEM);
221 sz->sz_inuse++;
222 return (0);
223 }
224
225 static void
g_raid3_uma_dtor(void * mem,int size,void * arg)226 g_raid3_uma_dtor(void *mem, int size, void *arg)
227 {
228 struct g_raid3_zone *sz = arg;
229
230 sz->sz_inuse--;
231 }
232
233 #define g_raid3_xor(src, dst, size) \
234 _g_raid3_xor((uint64_t *)(src), \
235 (uint64_t *)(dst), (size_t)size)
236 static void
_g_raid3_xor(uint64_t * src,uint64_t * dst,size_t size)237 _g_raid3_xor(uint64_t *src, uint64_t *dst, size_t size)
238 {
239
240 KASSERT((size % 128) == 0, ("Invalid size: %zu.", size));
241 for (; size > 0; size -= 128) {
242 *dst++ ^= (*src++);
243 *dst++ ^= (*src++);
244 *dst++ ^= (*src++);
245 *dst++ ^= (*src++);
246 *dst++ ^= (*src++);
247 *dst++ ^= (*src++);
248 *dst++ ^= (*src++);
249 *dst++ ^= (*src++);
250 *dst++ ^= (*src++);
251 *dst++ ^= (*src++);
252 *dst++ ^= (*src++);
253 *dst++ ^= (*src++);
254 *dst++ ^= (*src++);
255 *dst++ ^= (*src++);
256 *dst++ ^= (*src++);
257 *dst++ ^= (*src++);
258 }
259 }
260
261 static int
g_raid3_is_zero(struct bio * bp)262 g_raid3_is_zero(struct bio *bp)
263 {
264 static const uint64_t zeros[] = {
265 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
266 };
267 u_char *addr;
268 ssize_t size;
269
270 size = bp->bio_length;
271 addr = (u_char *)bp->bio_data;
272 for (; size > 0; size -= sizeof(zeros), addr += sizeof(zeros)) {
273 if (bcmp(addr, zeros, sizeof(zeros)) != 0)
274 return (0);
275 }
276 return (1);
277 }
278
279 /*
280 * --- Events handling functions ---
281 * Events in geom_raid3 are used to maintain disks and device status
282 * from one thread to simplify locking.
283 */
284 static void
g_raid3_event_free(struct g_raid3_event * ep)285 g_raid3_event_free(struct g_raid3_event *ep)
286 {
287
288 free(ep, M_RAID3);
289 }
290
291 static int
g_raid3_event_dispatch(struct g_raid3_event * ep,void * arg,int state,int flags)292 g_raid3_event_dispatch(struct g_raid3_event *ep, void *arg, int state,
293 int flags)
294 {
295 struct g_raid3_softc *sc;
296 struct g_raid3_disk *disk;
297 int error;
298
299 G_RAID3_DEBUG(4, "%s: Sending event %p.", __func__, ep);
300 if ((flags & G_RAID3_EVENT_DEVICE) != 0) {
301 disk = NULL;
302 sc = arg;
303 } else {
304 disk = arg;
305 sc = disk->d_softc;
306 }
307 ep->e_disk = disk;
308 ep->e_state = state;
309 ep->e_flags = flags;
310 ep->e_error = 0;
311 mtx_lock(&sc->sc_events_mtx);
312 TAILQ_INSERT_TAIL(&sc->sc_events, ep, e_next);
313 mtx_unlock(&sc->sc_events_mtx);
314 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
315 mtx_lock(&sc->sc_queue_mtx);
316 wakeup(sc);
317 wakeup(&sc->sc_queue);
318 mtx_unlock(&sc->sc_queue_mtx);
319 if ((flags & G_RAID3_EVENT_DONTWAIT) != 0)
320 return (0);
321 sx_assert(&sc->sc_lock, SX_XLOCKED);
322 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, ep);
323 sx_xunlock(&sc->sc_lock);
324 while ((ep->e_flags & G_RAID3_EVENT_DONE) == 0) {
325 mtx_lock(&sc->sc_events_mtx);
326 MSLEEP(ep, &sc->sc_events_mtx, PRIBIO | PDROP, "r3:event",
327 hz * 5);
328 }
329 error = ep->e_error;
330 g_raid3_event_free(ep);
331 sx_xlock(&sc->sc_lock);
332 return (error);
333 }
334
335 int
g_raid3_event_send(void * arg,int state,int flags)336 g_raid3_event_send(void *arg, int state, int flags)
337 {
338 struct g_raid3_event *ep;
339
340 ep = malloc(sizeof(*ep), M_RAID3, M_WAITOK);
341 return (g_raid3_event_dispatch(ep, arg, state, flags));
342 }
343
344 static struct g_raid3_event *
g_raid3_event_get(struct g_raid3_softc * sc)345 g_raid3_event_get(struct g_raid3_softc *sc)
346 {
347 struct g_raid3_event *ep;
348
349 mtx_lock(&sc->sc_events_mtx);
350 ep = TAILQ_FIRST(&sc->sc_events);
351 mtx_unlock(&sc->sc_events_mtx);
352 return (ep);
353 }
354
355 static void
g_raid3_event_remove(struct g_raid3_softc * sc,struct g_raid3_event * ep)356 g_raid3_event_remove(struct g_raid3_softc *sc, struct g_raid3_event *ep)
357 {
358
359 mtx_lock(&sc->sc_events_mtx);
360 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
361 mtx_unlock(&sc->sc_events_mtx);
362 }
363
364 static void
g_raid3_event_cancel(struct g_raid3_disk * disk)365 g_raid3_event_cancel(struct g_raid3_disk *disk)
366 {
367 struct g_raid3_softc *sc;
368 struct g_raid3_event *ep, *tmpep;
369
370 sc = disk->d_softc;
371 sx_assert(&sc->sc_lock, SX_XLOCKED);
372
373 mtx_lock(&sc->sc_events_mtx);
374 TAILQ_FOREACH_SAFE(ep, &sc->sc_events, e_next, tmpep) {
375 if ((ep->e_flags & G_RAID3_EVENT_DEVICE) != 0)
376 continue;
377 if (ep->e_disk != disk)
378 continue;
379 TAILQ_REMOVE(&sc->sc_events, ep, e_next);
380 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0)
381 g_raid3_event_free(ep);
382 else {
383 ep->e_error = ECANCELED;
384 wakeup(ep);
385 }
386 }
387 mtx_unlock(&sc->sc_events_mtx);
388 }
389
390 /*
391 * Return the number of disks in the given state.
392 * If state is equal to -1, count all connected disks.
393 */
394 u_int
g_raid3_ndisks(struct g_raid3_softc * sc,int state)395 g_raid3_ndisks(struct g_raid3_softc *sc, int state)
396 {
397 struct g_raid3_disk *disk;
398 u_int n, ndisks;
399
400 sx_assert(&sc->sc_lock, SX_LOCKED);
401
402 for (n = ndisks = 0; n < sc->sc_ndisks; n++) {
403 disk = &sc->sc_disks[n];
404 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
405 continue;
406 if (state == -1 || disk->d_state == state)
407 ndisks++;
408 }
409 return (ndisks);
410 }
411
412 static u_int
g_raid3_nrequests(struct g_raid3_softc * sc,struct g_consumer * cp)413 g_raid3_nrequests(struct g_raid3_softc *sc, struct g_consumer *cp)
414 {
415 struct bio *bp;
416 u_int nreqs = 0;
417
418 mtx_lock(&sc->sc_queue_mtx);
419 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
420 if (bp->bio_from == cp)
421 nreqs++;
422 }
423 mtx_unlock(&sc->sc_queue_mtx);
424 return (nreqs);
425 }
426
427 static int
g_raid3_is_busy(struct g_raid3_softc * sc,struct g_consumer * cp)428 g_raid3_is_busy(struct g_raid3_softc *sc, struct g_consumer *cp)
429 {
430
431 if (cp->index > 0) {
432 G_RAID3_DEBUG(2,
433 "I/O requests for %s exist, can't destroy it now.",
434 cp->provider->name);
435 return (1);
436 }
437 if (g_raid3_nrequests(sc, cp) > 0) {
438 G_RAID3_DEBUG(2,
439 "I/O requests for %s in queue, can't destroy it now.",
440 cp->provider->name);
441 return (1);
442 }
443 return (0);
444 }
445
446 static void
g_raid3_destroy_consumer(void * arg,int flags __unused)447 g_raid3_destroy_consumer(void *arg, int flags __unused)
448 {
449 struct g_consumer *cp;
450
451 g_topology_assert();
452
453 cp = arg;
454 G_RAID3_DEBUG(1, "Consumer %s destroyed.", cp->provider->name);
455 g_detach(cp);
456 g_destroy_consumer(cp);
457 }
458
459 static void
g_raid3_kill_consumer(struct g_raid3_softc * sc,struct g_consumer * cp)460 g_raid3_kill_consumer(struct g_raid3_softc *sc, struct g_consumer *cp)
461 {
462 struct g_provider *pp;
463 int retaste_wait;
464
465 g_topology_assert();
466
467 cp->private = NULL;
468 if (g_raid3_is_busy(sc, cp))
469 return;
470 G_RAID3_DEBUG(2, "Consumer %s destroyed.", cp->provider->name);
471 pp = cp->provider;
472 retaste_wait = 0;
473 if (cp->acw == 1) {
474 if ((pp->geom->flags & G_GEOM_WITHER) == 0)
475 retaste_wait = 1;
476 }
477 G_RAID3_DEBUG(2, "Access %s r%dw%de%d = %d", pp->name, -cp->acr,
478 -cp->acw, -cp->ace, 0);
479 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
480 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
481 if (retaste_wait) {
482 /*
483 * After retaste event was send (inside g_access()), we can send
484 * event to detach and destroy consumer.
485 * A class, which has consumer to the given provider connected
486 * will not receive retaste event for the provider.
487 * This is the way how I ignore retaste events when I close
488 * consumers opened for write: I detach and destroy consumer
489 * after retaste event is sent.
490 */
491 g_post_event(g_raid3_destroy_consumer, cp, M_WAITOK, NULL);
492 return;
493 }
494 G_RAID3_DEBUG(1, "Consumer %s destroyed.", pp->name);
495 g_detach(cp);
496 g_destroy_consumer(cp);
497 }
498
499 static int
g_raid3_connect_disk(struct g_raid3_disk * disk,struct g_provider * pp)500 g_raid3_connect_disk(struct g_raid3_disk *disk, struct g_provider *pp)
501 {
502 struct g_consumer *cp;
503 int error;
504
505 g_topology_assert_not();
506 KASSERT(disk->d_consumer == NULL,
507 ("Disk already connected (device %s).", disk->d_softc->sc_name));
508
509 g_topology_lock();
510 cp = g_new_consumer(disk->d_softc->sc_geom);
511 error = g_attach(cp, pp);
512 if (error != 0) {
513 g_destroy_consumer(cp);
514 g_topology_unlock();
515 return (error);
516 }
517 error = g_access(cp, 1, 1, 1);
518 g_topology_unlock();
519 if (error != 0) {
520 g_detach(cp);
521 g_destroy_consumer(cp);
522 G_RAID3_DEBUG(0, "Cannot open consumer %s (error=%d).",
523 pp->name, error);
524 return (error);
525 }
526 disk->d_consumer = cp;
527 disk->d_consumer->private = disk;
528 disk->d_consumer->index = 0;
529 G_RAID3_DEBUG(2, "Disk %s connected.", g_raid3_get_diskname(disk));
530 return (0);
531 }
532
533 static void
g_raid3_disconnect_consumer(struct g_raid3_softc * sc,struct g_consumer * cp)534 g_raid3_disconnect_consumer(struct g_raid3_softc *sc, struct g_consumer *cp)
535 {
536
537 g_topology_assert();
538
539 if (cp == NULL)
540 return;
541 if (cp->provider != NULL)
542 g_raid3_kill_consumer(sc, cp);
543 else
544 g_destroy_consumer(cp);
545 }
546
547 /*
548 * Initialize disk. This means allocate memory, create consumer, attach it
549 * to the provider and open access (r1w1e1) to it.
550 */
551 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)552 g_raid3_init_disk(struct g_raid3_softc *sc, struct g_provider *pp,
553 struct g_raid3_metadata *md, int *errorp)
554 {
555 struct g_raid3_disk *disk;
556 int error;
557
558 disk = &sc->sc_disks[md->md_no];
559 error = g_raid3_connect_disk(disk, pp);
560 if (error != 0) {
561 if (errorp != NULL)
562 *errorp = error;
563 return (NULL);
564 }
565 disk->d_state = G_RAID3_DISK_STATE_NONE;
566 disk->d_flags = md->md_dflags;
567 if (md->md_provider[0] != '\0')
568 disk->d_flags |= G_RAID3_DISK_FLAG_HARDCODED;
569 disk->d_sync.ds_consumer = NULL;
570 disk->d_sync.ds_offset = md->md_sync_offset;
571 disk->d_sync.ds_offset_done = md->md_sync_offset;
572 disk->d_genid = md->md_genid;
573 disk->d_sync.ds_syncid = md->md_syncid;
574 if (errorp != NULL)
575 *errorp = 0;
576 return (disk);
577 }
578
579 static void
g_raid3_destroy_disk(struct g_raid3_disk * disk)580 g_raid3_destroy_disk(struct g_raid3_disk *disk)
581 {
582 struct g_raid3_softc *sc;
583
584 g_topology_assert_not();
585 sc = disk->d_softc;
586 sx_assert(&sc->sc_lock, SX_XLOCKED);
587
588 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
589 return;
590 g_raid3_event_cancel(disk);
591 switch (disk->d_state) {
592 case G_RAID3_DISK_STATE_SYNCHRONIZING:
593 if (sc->sc_syncdisk != NULL)
594 g_raid3_sync_stop(sc, 1);
595 /* FALLTHROUGH */
596 case G_RAID3_DISK_STATE_NEW:
597 case G_RAID3_DISK_STATE_STALE:
598 case G_RAID3_DISK_STATE_ACTIVE:
599 g_topology_lock();
600 g_raid3_disconnect_consumer(sc, disk->d_consumer);
601 g_topology_unlock();
602 disk->d_consumer = NULL;
603 break;
604 default:
605 KASSERT(0 == 1, ("Wrong disk state (%s, %s).",
606 g_raid3_get_diskname(disk),
607 g_raid3_disk_state2str(disk->d_state)));
608 }
609 disk->d_state = G_RAID3_DISK_STATE_NODISK;
610 }
611
612 static void
g_raid3_free_device(struct g_raid3_softc * sc)613 g_raid3_free_device(struct g_raid3_softc *sc)
614 {
615 KASSERT(sc->sc_refcnt == 0,
616 ("%s: non-zero refcount %u", __func__, sc->sc_refcnt));
617
618 if (!g_raid3_use_malloc) {
619 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_64K].sz_zone);
620 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_16K].sz_zone);
621 uma_zdestroy(sc->sc_zones[G_RAID3_ZONE_4K].sz_zone);
622 }
623 mtx_destroy(&sc->sc_queue_mtx);
624 mtx_destroy(&sc->sc_events_mtx);
625 sx_xunlock(&sc->sc_lock);
626 sx_destroy(&sc->sc_lock);
627 free(sc->sc_disks, M_RAID3);
628 free(sc, M_RAID3);
629 }
630
631 static void
g_raid3_providergone(struct g_provider * pp)632 g_raid3_providergone(struct g_provider *pp)
633 {
634 struct g_raid3_softc *sc = pp->private;
635
636 if (--sc->sc_refcnt == 0)
637 g_raid3_free_device(sc);
638 }
639
640 static void
g_raid3_destroy_device(struct g_raid3_softc * sc)641 g_raid3_destroy_device(struct g_raid3_softc *sc)
642 {
643 struct g_raid3_event *ep;
644 struct g_raid3_disk *disk;
645 struct g_geom *gp;
646 struct g_consumer *cp;
647 u_int n;
648
649 g_topology_assert_not();
650 sx_assert(&sc->sc_lock, SX_XLOCKED);
651
652 gp = sc->sc_geom;
653 if (sc->sc_provider != NULL)
654 g_raid3_destroy_provider(sc);
655 for (n = 0; n < sc->sc_ndisks; n++) {
656 disk = &sc->sc_disks[n];
657 if (disk->d_state != G_RAID3_DISK_STATE_NODISK) {
658 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
659 g_raid3_update_metadata(disk);
660 g_raid3_destroy_disk(disk);
661 }
662 }
663 while ((ep = g_raid3_event_get(sc)) != NULL) {
664 g_raid3_event_remove(sc, ep);
665 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0)
666 g_raid3_event_free(ep);
667 else {
668 ep->e_error = ECANCELED;
669 ep->e_flags |= G_RAID3_EVENT_DONE;
670 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, ep);
671 mtx_lock(&sc->sc_events_mtx);
672 wakeup(ep);
673 mtx_unlock(&sc->sc_events_mtx);
674 }
675 }
676 g_raid3_timeout_drain(sc);
677 cp = LIST_FIRST(&sc->sc_sync.ds_geom->consumer);
678 g_topology_lock();
679 if (cp != NULL)
680 g_raid3_disconnect_consumer(sc, cp);
681 g_wither_geom(sc->sc_sync.ds_geom, ENXIO);
682 G_RAID3_DEBUG(0, "Device %s destroyed.", gp->name);
683 g_wither_geom(gp, ENXIO);
684 if (--sc->sc_refcnt == 0)
685 g_raid3_free_device(sc);
686 g_topology_unlock();
687 }
688
689 static void
g_raid3_orphan(struct g_consumer * cp)690 g_raid3_orphan(struct g_consumer *cp)
691 {
692 struct g_raid3_disk *disk;
693
694 g_topology_assert();
695
696 disk = cp->private;
697 if (disk == NULL)
698 return;
699 disk->d_softc->sc_bump_id = G_RAID3_BUMP_SYNCID;
700 g_raid3_event_send(disk, G_RAID3_DISK_STATE_DISCONNECTED,
701 G_RAID3_EVENT_DONTWAIT);
702 }
703
704 static int
g_raid3_write_metadata(struct g_raid3_disk * disk,struct g_raid3_metadata * md)705 g_raid3_write_metadata(struct g_raid3_disk *disk, struct g_raid3_metadata *md)
706 {
707 struct g_raid3_softc *sc;
708 struct g_consumer *cp;
709 off_t offset, length;
710 u_char *sector;
711 int error = 0;
712
713 g_topology_assert_not();
714 sc = disk->d_softc;
715 sx_assert(&sc->sc_lock, SX_LOCKED);
716
717 cp = disk->d_consumer;
718 KASSERT(cp != NULL, ("NULL consumer (%s).", sc->sc_name));
719 KASSERT(cp->provider != NULL, ("NULL provider (%s).", sc->sc_name));
720 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
721 ("Consumer %s closed? (r%dw%de%d).", cp->provider->name, cp->acr,
722 cp->acw, cp->ace));
723 length = cp->provider->sectorsize;
724 offset = cp->provider->mediasize - length;
725 sector = malloc((size_t)length, M_RAID3, M_WAITOK | M_ZERO);
726 if (md != NULL)
727 raid3_metadata_encode(md, sector);
728 error = g_write_data(cp, offset, sector, length);
729 free(sector, M_RAID3);
730 if (error != 0) {
731 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
732 G_RAID3_DEBUG(0, "Cannot write metadata on %s "
733 "(device=%s, error=%d).",
734 g_raid3_get_diskname(disk), sc->sc_name, error);
735 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
736 } else {
737 G_RAID3_DEBUG(1, "Cannot write metadata on %s "
738 "(device=%s, error=%d).",
739 g_raid3_get_diskname(disk), sc->sc_name, error);
740 }
741 if (g_raid3_disconnect_on_failure &&
742 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
743 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
744 g_raid3_event_send(disk,
745 G_RAID3_DISK_STATE_DISCONNECTED,
746 G_RAID3_EVENT_DONTWAIT);
747 }
748 }
749 return (error);
750 }
751
752 int
g_raid3_clear_metadata(struct g_raid3_disk * disk)753 g_raid3_clear_metadata(struct g_raid3_disk *disk)
754 {
755 int error;
756
757 g_topology_assert_not();
758 sx_assert(&disk->d_softc->sc_lock, SX_LOCKED);
759
760 error = g_raid3_write_metadata(disk, NULL);
761 if (error == 0) {
762 G_RAID3_DEBUG(2, "Metadata on %s cleared.",
763 g_raid3_get_diskname(disk));
764 } else {
765 G_RAID3_DEBUG(0,
766 "Cannot clear metadata on disk %s (error=%d).",
767 g_raid3_get_diskname(disk), error);
768 }
769 return (error);
770 }
771
772 void
g_raid3_fill_metadata(struct g_raid3_disk * disk,struct g_raid3_metadata * md)773 g_raid3_fill_metadata(struct g_raid3_disk *disk, struct g_raid3_metadata *md)
774 {
775 struct g_raid3_softc *sc;
776 struct g_provider *pp;
777
778 bzero(md, sizeof(*md));
779 sc = disk->d_softc;
780 strlcpy(md->md_magic, G_RAID3_MAGIC, sizeof(md->md_magic));
781 md->md_version = G_RAID3_VERSION;
782 strlcpy(md->md_name, sc->sc_name, sizeof(md->md_name));
783 md->md_id = sc->sc_id;
784 md->md_all = sc->sc_ndisks;
785 md->md_genid = sc->sc_genid;
786 md->md_mediasize = sc->sc_mediasize;
787 md->md_sectorsize = sc->sc_sectorsize;
788 md->md_mflags = (sc->sc_flags & G_RAID3_DEVICE_FLAG_MASK);
789 md->md_no = disk->d_no;
790 md->md_syncid = disk->d_sync.ds_syncid;
791 md->md_dflags = (disk->d_flags & G_RAID3_DISK_FLAG_MASK);
792 if (disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
793 md->md_sync_offset =
794 disk->d_sync.ds_offset_done / (sc->sc_ndisks - 1);
795 }
796 if (disk->d_consumer != NULL && disk->d_consumer->provider != NULL)
797 pp = disk->d_consumer->provider;
798 else
799 pp = NULL;
800 if ((disk->d_flags & G_RAID3_DISK_FLAG_HARDCODED) != 0 && pp != NULL)
801 strlcpy(md->md_provider, pp->name, sizeof(md->md_provider));
802 if (pp != NULL)
803 md->md_provsize = pp->mediasize;
804 }
805
806 void
g_raid3_update_metadata(struct g_raid3_disk * disk)807 g_raid3_update_metadata(struct g_raid3_disk *disk)
808 {
809 struct g_raid3_softc *sc __diagused;
810 struct g_raid3_metadata md;
811 int error;
812
813 g_topology_assert_not();
814 sc = disk->d_softc;
815 sx_assert(&sc->sc_lock, SX_LOCKED);
816
817 g_raid3_fill_metadata(disk, &md);
818 error = g_raid3_write_metadata(disk, &md);
819 if (error == 0) {
820 G_RAID3_DEBUG(2, "Metadata on %s updated.",
821 g_raid3_get_diskname(disk));
822 } else {
823 G_RAID3_DEBUG(0,
824 "Cannot update metadata on disk %s (error=%d).",
825 g_raid3_get_diskname(disk), error);
826 }
827 }
828
829 static void
g_raid3_bump_syncid(struct g_raid3_softc * sc)830 g_raid3_bump_syncid(struct g_raid3_softc *sc)
831 {
832 struct g_raid3_disk *disk;
833 u_int n;
834
835 g_topology_assert_not();
836 sx_assert(&sc->sc_lock, SX_XLOCKED);
837 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) > 0,
838 ("%s called with no active disks (device=%s).", __func__,
839 sc->sc_name));
840
841 sc->sc_syncid++;
842 G_RAID3_DEBUG(1, "Device %s: syncid bumped to %u.", sc->sc_name,
843 sc->sc_syncid);
844 for (n = 0; n < sc->sc_ndisks; n++) {
845 disk = &sc->sc_disks[n];
846 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
847 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
848 disk->d_sync.ds_syncid = sc->sc_syncid;
849 g_raid3_update_metadata(disk);
850 }
851 }
852 }
853
854 static void
g_raid3_bump_genid(struct g_raid3_softc * sc)855 g_raid3_bump_genid(struct g_raid3_softc *sc)
856 {
857 struct g_raid3_disk *disk;
858 u_int n;
859
860 g_topology_assert_not();
861 sx_assert(&sc->sc_lock, SX_XLOCKED);
862 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) > 0,
863 ("%s called with no active disks (device=%s).", __func__,
864 sc->sc_name));
865
866 sc->sc_genid++;
867 G_RAID3_DEBUG(1, "Device %s: genid bumped to %u.", sc->sc_name,
868 sc->sc_genid);
869 for (n = 0; n < sc->sc_ndisks; n++) {
870 disk = &sc->sc_disks[n];
871 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
872 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
873 disk->d_genid = sc->sc_genid;
874 g_raid3_update_metadata(disk);
875 }
876 }
877 }
878
879 static int
g_raid3_idle(struct g_raid3_softc * sc,int acw)880 g_raid3_idle(struct g_raid3_softc *sc, int acw)
881 {
882 struct g_raid3_disk *disk;
883 u_int i;
884 int timeout;
885
886 g_topology_assert_not();
887 sx_assert(&sc->sc_lock, SX_XLOCKED);
888
889 if (sc->sc_provider == NULL)
890 return (0);
891 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
892 return (0);
893 if (sc->sc_idle)
894 return (0);
895 if (sc->sc_writes > 0)
896 return (0);
897 if (acw > 0 || (acw == -1 && sc->sc_provider->acw > 0)) {
898 timeout = g_raid3_idletime - (time_uptime - sc->sc_last_write);
899 if (!g_raid3_shutdown && timeout > 0)
900 return (timeout);
901 }
902 sc->sc_idle = 1;
903 for (i = 0; i < sc->sc_ndisks; i++) {
904 disk = &sc->sc_disks[i];
905 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
906 continue;
907 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as clean.",
908 g_raid3_get_diskname(disk), sc->sc_name);
909 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
910 g_raid3_update_metadata(disk);
911 }
912 return (0);
913 }
914
915 static void
g_raid3_unidle(struct g_raid3_softc * sc)916 g_raid3_unidle(struct g_raid3_softc *sc)
917 {
918 struct g_raid3_disk *disk;
919 u_int i;
920
921 g_topology_assert_not();
922 sx_assert(&sc->sc_lock, SX_XLOCKED);
923
924 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
925 return;
926 sc->sc_idle = 0;
927 sc->sc_last_write = time_uptime;
928 for (i = 0; i < sc->sc_ndisks; i++) {
929 disk = &sc->sc_disks[i];
930 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
931 continue;
932 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as dirty.",
933 g_raid3_get_diskname(disk), sc->sc_name);
934 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
935 g_raid3_update_metadata(disk);
936 }
937 }
938
939 /*
940 * Treat bio_driver1 field in parent bio as list head and field bio_caller1
941 * in child bio as pointer to the next element on the list.
942 */
943 #define G_RAID3_HEAD_BIO(pbp) (pbp)->bio_driver1
944
945 #define G_RAID3_NEXT_BIO(cbp) (cbp)->bio_caller1
946
947 #define G_RAID3_FOREACH_BIO(pbp, bp) \
948 for ((bp) = G_RAID3_HEAD_BIO(pbp); (bp) != NULL; \
949 (bp) = G_RAID3_NEXT_BIO(bp))
950
951 #define G_RAID3_FOREACH_SAFE_BIO(pbp, bp, tmpbp) \
952 for ((bp) = G_RAID3_HEAD_BIO(pbp); \
953 (bp) != NULL && ((tmpbp) = G_RAID3_NEXT_BIO(bp), 1); \
954 (bp) = (tmpbp))
955
956 static void
g_raid3_init_bio(struct bio * pbp)957 g_raid3_init_bio(struct bio *pbp)
958 {
959
960 G_RAID3_HEAD_BIO(pbp) = NULL;
961 }
962
963 static void
g_raid3_remove_bio(struct bio * cbp)964 g_raid3_remove_bio(struct bio *cbp)
965 {
966 struct bio *pbp, *bp;
967
968 pbp = cbp->bio_parent;
969 if (G_RAID3_HEAD_BIO(pbp) == cbp)
970 G_RAID3_HEAD_BIO(pbp) = G_RAID3_NEXT_BIO(cbp);
971 else {
972 G_RAID3_FOREACH_BIO(pbp, bp) {
973 if (G_RAID3_NEXT_BIO(bp) == cbp) {
974 G_RAID3_NEXT_BIO(bp) = G_RAID3_NEXT_BIO(cbp);
975 break;
976 }
977 }
978 }
979 G_RAID3_NEXT_BIO(cbp) = NULL;
980 }
981
982 static void
g_raid3_replace_bio(struct bio * sbp,struct bio * dbp)983 g_raid3_replace_bio(struct bio *sbp, struct bio *dbp)
984 {
985 struct bio *pbp, *bp;
986
987 g_raid3_remove_bio(sbp);
988 pbp = dbp->bio_parent;
989 G_RAID3_NEXT_BIO(sbp) = G_RAID3_NEXT_BIO(dbp);
990 if (G_RAID3_HEAD_BIO(pbp) == dbp)
991 G_RAID3_HEAD_BIO(pbp) = sbp;
992 else {
993 G_RAID3_FOREACH_BIO(pbp, bp) {
994 if (G_RAID3_NEXT_BIO(bp) == dbp) {
995 G_RAID3_NEXT_BIO(bp) = sbp;
996 break;
997 }
998 }
999 }
1000 G_RAID3_NEXT_BIO(dbp) = NULL;
1001 }
1002
1003 static void
g_raid3_destroy_bio(struct g_raid3_softc * sc,struct bio * cbp)1004 g_raid3_destroy_bio(struct g_raid3_softc *sc, struct bio *cbp)
1005 {
1006 struct bio *bp, *pbp;
1007 size_t size;
1008
1009 pbp = cbp->bio_parent;
1010 pbp->bio_children--;
1011 KASSERT(cbp->bio_data != NULL, ("NULL bio_data"));
1012 size = pbp->bio_length / (sc->sc_ndisks - 1);
1013 g_raid3_free(sc, cbp->bio_data, size);
1014 if (G_RAID3_HEAD_BIO(pbp) == cbp) {
1015 G_RAID3_HEAD_BIO(pbp) = G_RAID3_NEXT_BIO(cbp);
1016 G_RAID3_NEXT_BIO(cbp) = NULL;
1017 g_destroy_bio(cbp);
1018 } else {
1019 G_RAID3_FOREACH_BIO(pbp, bp) {
1020 if (G_RAID3_NEXT_BIO(bp) == cbp)
1021 break;
1022 }
1023 if (bp != NULL) {
1024 KASSERT(G_RAID3_NEXT_BIO(bp) != NULL,
1025 ("NULL bp->bio_driver1"));
1026 G_RAID3_NEXT_BIO(bp) = G_RAID3_NEXT_BIO(cbp);
1027 G_RAID3_NEXT_BIO(cbp) = NULL;
1028 }
1029 g_destroy_bio(cbp);
1030 }
1031 }
1032
1033 static struct bio *
g_raid3_clone_bio(struct g_raid3_softc * sc,struct bio * pbp)1034 g_raid3_clone_bio(struct g_raid3_softc *sc, struct bio *pbp)
1035 {
1036 struct bio *bp, *cbp;
1037 size_t size;
1038 int memflag;
1039
1040 cbp = g_clone_bio(pbp);
1041 if (cbp == NULL)
1042 return (NULL);
1043 size = pbp->bio_length / (sc->sc_ndisks - 1);
1044 if ((pbp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR) != 0)
1045 memflag = M_WAITOK;
1046 else
1047 memflag = M_NOWAIT;
1048 cbp->bio_data = g_raid3_alloc(sc, size, memflag);
1049 if (cbp->bio_data == NULL) {
1050 pbp->bio_children--;
1051 g_destroy_bio(cbp);
1052 return (NULL);
1053 }
1054 G_RAID3_NEXT_BIO(cbp) = NULL;
1055 if (G_RAID3_HEAD_BIO(pbp) == NULL)
1056 G_RAID3_HEAD_BIO(pbp) = cbp;
1057 else {
1058 G_RAID3_FOREACH_BIO(pbp, bp) {
1059 if (G_RAID3_NEXT_BIO(bp) == NULL) {
1060 G_RAID3_NEXT_BIO(bp) = cbp;
1061 break;
1062 }
1063 }
1064 }
1065 return (cbp);
1066 }
1067
1068 static void
g_raid3_scatter(struct bio * pbp)1069 g_raid3_scatter(struct bio *pbp)
1070 {
1071 struct g_raid3_softc *sc;
1072 struct g_raid3_disk *disk;
1073 struct bio *bp, *cbp, *tmpbp;
1074 off_t atom, cadd, padd, left;
1075 int first;
1076
1077 sc = pbp->bio_to->private;
1078 bp = NULL;
1079 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_NOPARITY) == 0) {
1080 /*
1081 * Find bio for which we should calculate data.
1082 */
1083 G_RAID3_FOREACH_BIO(pbp, cbp) {
1084 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0) {
1085 bp = cbp;
1086 break;
1087 }
1088 }
1089 KASSERT(bp != NULL, ("NULL parity bio."));
1090 }
1091 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1092 cadd = padd = 0;
1093 for (left = pbp->bio_length; left > 0; left -= sc->sc_sectorsize) {
1094 G_RAID3_FOREACH_BIO(pbp, cbp) {
1095 if (cbp == bp)
1096 continue;
1097 bcopy(pbp->bio_data + padd, cbp->bio_data + cadd, atom);
1098 padd += atom;
1099 }
1100 cadd += atom;
1101 }
1102 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_NOPARITY) == 0) {
1103 /*
1104 * Calculate parity.
1105 */
1106 first = 1;
1107 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1108 if (cbp == bp)
1109 continue;
1110 if (first) {
1111 bcopy(cbp->bio_data, bp->bio_data,
1112 bp->bio_length);
1113 first = 0;
1114 } else {
1115 g_raid3_xor(cbp->bio_data, bp->bio_data,
1116 bp->bio_length);
1117 }
1118 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_NODISK) != 0)
1119 g_raid3_destroy_bio(sc, cbp);
1120 }
1121 }
1122 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1123 struct g_consumer *cp;
1124
1125 disk = cbp->bio_caller2;
1126 cp = disk->d_consumer;
1127 cbp->bio_to = cp->provider;
1128 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1129 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1130 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1131 cp->acr, cp->acw, cp->ace));
1132 cp->index++;
1133 sc->sc_writes++;
1134 g_io_request(cbp, cp);
1135 }
1136 }
1137
1138 static void
g_raid3_gather(struct bio * pbp)1139 g_raid3_gather(struct bio *pbp)
1140 {
1141 struct g_raid3_softc *sc;
1142 struct g_raid3_disk *disk;
1143 struct bio *xbp, *fbp, *cbp;
1144 off_t atom, cadd, padd, left;
1145
1146 sc = pbp->bio_to->private;
1147 /*
1148 * Find bio for which we have to calculate data.
1149 * While going through this path, check if all requests
1150 * succeeded, if not, deny whole request.
1151 * If we're in COMPLETE mode, we allow one request to fail,
1152 * so if we find one, we're sending it to the parity consumer.
1153 * If there are more failed requests, we deny whole request.
1154 */
1155 xbp = fbp = NULL;
1156 G_RAID3_FOREACH_BIO(pbp, cbp) {
1157 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0) {
1158 KASSERT(xbp == NULL, ("More than one parity bio."));
1159 xbp = cbp;
1160 }
1161 if (cbp->bio_error == 0)
1162 continue;
1163 /*
1164 * Found failed request.
1165 */
1166 if (fbp == NULL) {
1167 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_DEGRADED) != 0) {
1168 /*
1169 * We are already in degraded mode, so we can't
1170 * accept any failures.
1171 */
1172 if (pbp->bio_error == 0)
1173 pbp->bio_error = cbp->bio_error;
1174 } else {
1175 fbp = cbp;
1176 }
1177 } else {
1178 /*
1179 * Next failed request, that's too many.
1180 */
1181 if (pbp->bio_error == 0)
1182 pbp->bio_error = fbp->bio_error;
1183 }
1184 disk = cbp->bio_caller2;
1185 if (disk == NULL)
1186 continue;
1187 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
1188 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
1189 G_RAID3_LOGREQ(0, cbp, "Request failed (error=%d).",
1190 cbp->bio_error);
1191 } else {
1192 G_RAID3_LOGREQ(1, cbp, "Request failed (error=%d).",
1193 cbp->bio_error);
1194 }
1195 if (g_raid3_disconnect_on_failure &&
1196 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1197 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1198 g_raid3_event_send(disk,
1199 G_RAID3_DISK_STATE_DISCONNECTED,
1200 G_RAID3_EVENT_DONTWAIT);
1201 }
1202 }
1203 if (pbp->bio_error != 0)
1204 goto finish;
1205 if (fbp != NULL && (pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0) {
1206 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_VERIFY;
1207 if (xbp != fbp)
1208 g_raid3_replace_bio(xbp, fbp);
1209 g_raid3_destroy_bio(sc, fbp);
1210 } else if (fbp != NULL) {
1211 struct g_consumer *cp;
1212
1213 /*
1214 * One request failed, so send the same request to
1215 * the parity consumer.
1216 */
1217 disk = pbp->bio_driver2;
1218 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE) {
1219 pbp->bio_error = fbp->bio_error;
1220 goto finish;
1221 }
1222 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1223 pbp->bio_inbed--;
1224 fbp->bio_flags &= ~(BIO_DONE | BIO_ERROR);
1225 if (disk->d_no == sc->sc_ndisks - 1)
1226 fbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1227 fbp->bio_error = 0;
1228 fbp->bio_completed = 0;
1229 fbp->bio_children = 0;
1230 fbp->bio_inbed = 0;
1231 cp = disk->d_consumer;
1232 fbp->bio_caller2 = disk;
1233 fbp->bio_to = cp->provider;
1234 G_RAID3_LOGREQ(3, fbp, "Sending request (recover).");
1235 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1236 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1237 cp->acr, cp->acw, cp->ace));
1238 cp->index++;
1239 g_io_request(fbp, cp);
1240 return;
1241 }
1242 if (xbp != NULL) {
1243 /*
1244 * Calculate parity.
1245 */
1246 G_RAID3_FOREACH_BIO(pbp, cbp) {
1247 if ((cbp->bio_cflags & G_RAID3_BIO_CFLAG_PARITY) != 0)
1248 continue;
1249 g_raid3_xor(cbp->bio_data, xbp->bio_data,
1250 xbp->bio_length);
1251 }
1252 xbp->bio_cflags &= ~G_RAID3_BIO_CFLAG_PARITY;
1253 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0) {
1254 if (!g_raid3_is_zero(xbp)) {
1255 g_raid3_parity_mismatch++;
1256 pbp->bio_error = EIO;
1257 goto finish;
1258 }
1259 g_raid3_destroy_bio(sc, xbp);
1260 }
1261 }
1262 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1263 cadd = padd = 0;
1264 for (left = pbp->bio_length; left > 0; left -= sc->sc_sectorsize) {
1265 G_RAID3_FOREACH_BIO(pbp, cbp) {
1266 bcopy(cbp->bio_data + cadd, pbp->bio_data + padd, atom);
1267 pbp->bio_completed += atom;
1268 padd += atom;
1269 }
1270 cadd += atom;
1271 }
1272 finish:
1273 if (pbp->bio_error == 0)
1274 G_RAID3_LOGREQ(3, pbp, "Request finished.");
1275 else {
1276 if ((pbp->bio_pflags & G_RAID3_BIO_PFLAG_VERIFY) != 0)
1277 G_RAID3_LOGREQ(1, pbp, "Verification error.");
1278 else
1279 G_RAID3_LOGREQ(0, pbp, "Request failed.");
1280 }
1281 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_MASK;
1282 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL)
1283 g_raid3_destroy_bio(sc, cbp);
1284 g_io_deliver(pbp, pbp->bio_error);
1285 }
1286
1287 static void
g_raid3_done(struct bio * bp)1288 g_raid3_done(struct bio *bp)
1289 {
1290 struct g_raid3_softc *sc;
1291
1292 sc = bp->bio_from->geom->softc;
1293 bp->bio_cflags |= G_RAID3_BIO_CFLAG_REGULAR;
1294 G_RAID3_LOGREQ(3, bp, "Regular request done (error=%d).", bp->bio_error);
1295 mtx_lock(&sc->sc_queue_mtx);
1296 bioq_insert_head(&sc->sc_queue, bp);
1297 mtx_unlock(&sc->sc_queue_mtx);
1298 wakeup(sc);
1299 wakeup(&sc->sc_queue);
1300 }
1301
1302 static void
g_raid3_regular_request(struct bio * cbp)1303 g_raid3_regular_request(struct bio *cbp)
1304 {
1305 struct g_raid3_softc *sc;
1306 struct g_raid3_disk *disk;
1307 struct bio *pbp;
1308
1309 g_topology_assert_not();
1310
1311 pbp = cbp->bio_parent;
1312 sc = pbp->bio_to->private;
1313 cbp->bio_from->index--;
1314 if (cbp->bio_cmd == BIO_WRITE)
1315 sc->sc_writes--;
1316 disk = cbp->bio_from->private;
1317 if (disk == NULL) {
1318 g_topology_lock();
1319 g_raid3_kill_consumer(sc, cbp->bio_from);
1320 g_topology_unlock();
1321 }
1322
1323 G_RAID3_LOGREQ(3, cbp, "Request finished.");
1324 pbp->bio_inbed++;
1325 KASSERT(pbp->bio_inbed <= pbp->bio_children,
1326 ("bio_inbed (%u) is bigger than bio_children (%u).", pbp->bio_inbed,
1327 pbp->bio_children));
1328 if (pbp->bio_inbed != pbp->bio_children)
1329 return;
1330 switch (pbp->bio_cmd) {
1331 case BIO_READ:
1332 g_raid3_gather(pbp);
1333 break;
1334 case BIO_WRITE:
1335 case BIO_DELETE:
1336 {
1337 int error = 0;
1338
1339 pbp->bio_completed = pbp->bio_length;
1340 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL) {
1341 if (cbp->bio_error == 0) {
1342 g_raid3_destroy_bio(sc, cbp);
1343 continue;
1344 }
1345
1346 if (error == 0)
1347 error = cbp->bio_error;
1348 else if (pbp->bio_error == 0) {
1349 /*
1350 * Next failed request, that's too many.
1351 */
1352 pbp->bio_error = error;
1353 }
1354
1355 disk = cbp->bio_caller2;
1356 if (disk == NULL) {
1357 g_raid3_destroy_bio(sc, cbp);
1358 continue;
1359 }
1360
1361 if ((disk->d_flags & G_RAID3_DISK_FLAG_BROKEN) == 0) {
1362 disk->d_flags |= G_RAID3_DISK_FLAG_BROKEN;
1363 G_RAID3_LOGREQ(0, cbp,
1364 "Request failed (error=%d).",
1365 cbp->bio_error);
1366 } else {
1367 G_RAID3_LOGREQ(1, cbp,
1368 "Request failed (error=%d).",
1369 cbp->bio_error);
1370 }
1371 if (g_raid3_disconnect_on_failure &&
1372 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1373 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1374 g_raid3_event_send(disk,
1375 G_RAID3_DISK_STATE_DISCONNECTED,
1376 G_RAID3_EVENT_DONTWAIT);
1377 }
1378 g_raid3_destroy_bio(sc, cbp);
1379 }
1380 if (pbp->bio_error == 0)
1381 G_RAID3_LOGREQ(3, pbp, "Request finished.");
1382 else
1383 G_RAID3_LOGREQ(0, pbp, "Request failed.");
1384 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_DEGRADED;
1385 pbp->bio_pflags &= ~G_RAID3_BIO_PFLAG_NOPARITY;
1386 bioq_remove(&sc->sc_inflight, pbp);
1387 /* Release delayed sync requests if possible. */
1388 g_raid3_sync_release(sc);
1389 g_io_deliver(pbp, pbp->bio_error);
1390 break;
1391 }
1392 }
1393 }
1394
1395 static void
g_raid3_sync_done(struct bio * bp)1396 g_raid3_sync_done(struct bio *bp)
1397 {
1398 struct g_raid3_softc *sc;
1399
1400 G_RAID3_LOGREQ(3, bp, "Synchronization request delivered.");
1401 sc = bp->bio_from->geom->softc;
1402 bp->bio_cflags |= G_RAID3_BIO_CFLAG_SYNC;
1403 mtx_lock(&sc->sc_queue_mtx);
1404 bioq_insert_head(&sc->sc_queue, bp);
1405 mtx_unlock(&sc->sc_queue_mtx);
1406 wakeup(sc);
1407 wakeup(&sc->sc_queue);
1408 }
1409
1410 static void
g_raid3_flush(struct g_raid3_softc * sc,struct bio * bp)1411 g_raid3_flush(struct g_raid3_softc *sc, struct bio *bp)
1412 {
1413 struct bio_queue_head queue;
1414 struct g_raid3_disk *disk;
1415 struct g_consumer *cp __diagused;
1416 struct bio *cbp;
1417 u_int i;
1418
1419 bioq_init(&queue);
1420 for (i = 0; i < sc->sc_ndisks; i++) {
1421 disk = &sc->sc_disks[i];
1422 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE)
1423 continue;
1424 cbp = g_clone_bio(bp);
1425 if (cbp == NULL) {
1426 for (cbp = bioq_first(&queue); cbp != NULL;
1427 cbp = bioq_first(&queue)) {
1428 bioq_remove(&queue, cbp);
1429 g_destroy_bio(cbp);
1430 }
1431 if (bp->bio_error == 0)
1432 bp->bio_error = ENOMEM;
1433 g_io_deliver(bp, bp->bio_error);
1434 return;
1435 }
1436 bioq_insert_tail(&queue, cbp);
1437 cbp->bio_done = g_std_done;
1438 cbp->bio_caller1 = disk;
1439 cbp->bio_to = disk->d_consumer->provider;
1440 }
1441 for (cbp = bioq_first(&queue); cbp != NULL; cbp = bioq_first(&queue)) {
1442 bioq_remove(&queue, cbp);
1443 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1444 disk = cbp->bio_caller1;
1445 cbp->bio_caller1 = NULL;
1446 cp = disk->d_consumer;
1447 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1448 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1449 cp->acr, cp->acw, cp->ace));
1450 g_io_request(cbp, disk->d_consumer);
1451 }
1452 }
1453
1454 static void
g_raid3_start(struct bio * bp)1455 g_raid3_start(struct bio *bp)
1456 {
1457 struct g_raid3_softc *sc;
1458
1459 sc = bp->bio_to->private;
1460 /*
1461 * If sc == NULL or there are no valid disks, provider's error
1462 * should be set and g_raid3_start() should not be called at all.
1463 */
1464 KASSERT(sc != NULL && (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
1465 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE),
1466 ("Provider's error should be set (error=%d)(device=%s).",
1467 bp->bio_to->error, bp->bio_to->name));
1468 G_RAID3_LOGREQ(3, bp, "Request received.");
1469
1470 switch (bp->bio_cmd) {
1471 case BIO_READ:
1472 case BIO_WRITE:
1473 case BIO_DELETE:
1474 break;
1475 case BIO_SPEEDUP:
1476 case BIO_FLUSH:
1477 g_raid3_flush(sc, bp);
1478 return;
1479 case BIO_GETATTR:
1480 default:
1481 g_io_deliver(bp, EOPNOTSUPP);
1482 return;
1483 }
1484 mtx_lock(&sc->sc_queue_mtx);
1485 bioq_insert_tail(&sc->sc_queue, bp);
1486 mtx_unlock(&sc->sc_queue_mtx);
1487 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
1488 wakeup(sc);
1489 }
1490
1491 /*
1492 * Return TRUE if the given request is colliding with a in-progress
1493 * synchronization request.
1494 */
1495 static int
g_raid3_sync_collision(struct g_raid3_softc * sc,struct bio * bp)1496 g_raid3_sync_collision(struct g_raid3_softc *sc, struct bio *bp)
1497 {
1498 struct g_raid3_disk *disk;
1499 struct bio *sbp;
1500 off_t rstart, rend, sstart, send;
1501 int i;
1502
1503 disk = sc->sc_syncdisk;
1504 if (disk == NULL)
1505 return (0);
1506 rstart = bp->bio_offset;
1507 rend = bp->bio_offset + bp->bio_length;
1508 for (i = 0; i < g_raid3_syncreqs; i++) {
1509 sbp = disk->d_sync.ds_bios[i];
1510 if (sbp == NULL)
1511 continue;
1512 sstart = sbp->bio_offset;
1513 send = sbp->bio_length;
1514 if (sbp->bio_cmd == BIO_WRITE) {
1515 sstart *= sc->sc_ndisks - 1;
1516 send *= sc->sc_ndisks - 1;
1517 }
1518 send += sstart;
1519 if (rend > sstart && rstart < send)
1520 return (1);
1521 }
1522 return (0);
1523 }
1524
1525 /*
1526 * Return TRUE if the given sync request is colliding with a in-progress regular
1527 * request.
1528 */
1529 static int
g_raid3_regular_collision(struct g_raid3_softc * sc,struct bio * sbp)1530 g_raid3_regular_collision(struct g_raid3_softc *sc, struct bio *sbp)
1531 {
1532 off_t rstart, rend, sstart, send;
1533 struct bio *bp;
1534
1535 if (sc->sc_syncdisk == NULL)
1536 return (0);
1537 sstart = sbp->bio_offset;
1538 send = sstart + sbp->bio_length;
1539 TAILQ_FOREACH(bp, &sc->sc_inflight.queue, bio_queue) {
1540 rstart = bp->bio_offset;
1541 rend = bp->bio_offset + bp->bio_length;
1542 if (rend > sstart && rstart < send)
1543 return (1);
1544 }
1545 return (0);
1546 }
1547
1548 /*
1549 * Puts request onto delayed queue.
1550 */
1551 static void
g_raid3_regular_delay(struct g_raid3_softc * sc,struct bio * bp)1552 g_raid3_regular_delay(struct g_raid3_softc *sc, struct bio *bp)
1553 {
1554
1555 G_RAID3_LOGREQ(2, bp, "Delaying request.");
1556 bioq_insert_head(&sc->sc_regular_delayed, bp);
1557 }
1558
1559 /*
1560 * Puts synchronization request onto delayed queue.
1561 */
1562 static void
g_raid3_sync_delay(struct g_raid3_softc * sc,struct bio * bp)1563 g_raid3_sync_delay(struct g_raid3_softc *sc, struct bio *bp)
1564 {
1565
1566 G_RAID3_LOGREQ(2, bp, "Delaying synchronization request.");
1567 bioq_insert_tail(&sc->sc_sync_delayed, bp);
1568 }
1569
1570 /*
1571 * Releases delayed regular requests which don't collide anymore with sync
1572 * requests.
1573 */
1574 static void
g_raid3_regular_release(struct g_raid3_softc * sc)1575 g_raid3_regular_release(struct g_raid3_softc *sc)
1576 {
1577 struct bio *bp, *bp2;
1578
1579 TAILQ_FOREACH_SAFE(bp, &sc->sc_regular_delayed.queue, bio_queue, bp2) {
1580 if (g_raid3_sync_collision(sc, bp))
1581 continue;
1582 bioq_remove(&sc->sc_regular_delayed, bp);
1583 G_RAID3_LOGREQ(2, bp, "Releasing delayed request (%p).", bp);
1584 mtx_lock(&sc->sc_queue_mtx);
1585 bioq_insert_head(&sc->sc_queue, bp);
1586 #if 0
1587 /*
1588 * wakeup() is not needed, because this function is called from
1589 * the worker thread.
1590 */
1591 wakeup(&sc->sc_queue);
1592 #endif
1593 mtx_unlock(&sc->sc_queue_mtx);
1594 }
1595 }
1596
1597 /*
1598 * Releases delayed sync requests which don't collide anymore with regular
1599 * requests.
1600 */
1601 static void
g_raid3_sync_release(struct g_raid3_softc * sc)1602 g_raid3_sync_release(struct g_raid3_softc *sc)
1603 {
1604 struct bio *bp, *bp2;
1605
1606 TAILQ_FOREACH_SAFE(bp, &sc->sc_sync_delayed.queue, bio_queue, bp2) {
1607 if (g_raid3_regular_collision(sc, bp))
1608 continue;
1609 bioq_remove(&sc->sc_sync_delayed, bp);
1610 G_RAID3_LOGREQ(2, bp,
1611 "Releasing delayed synchronization request.");
1612 g_io_request(bp, bp->bio_from);
1613 }
1614 }
1615
1616 /*
1617 * Handle synchronization requests.
1618 * Every synchronization request is two-steps process: first, READ request is
1619 * send to active provider and then WRITE request (with read data) to the provider
1620 * being synchronized. When WRITE is finished, new synchronization request is
1621 * send.
1622 */
1623 static void
g_raid3_sync_request(struct bio * bp)1624 g_raid3_sync_request(struct bio *bp)
1625 {
1626 struct g_raid3_softc *sc;
1627 struct g_raid3_disk *disk;
1628
1629 bp->bio_from->index--;
1630 sc = bp->bio_from->geom->softc;
1631 disk = bp->bio_from->private;
1632 if (disk == NULL) {
1633 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
1634 g_topology_lock();
1635 g_raid3_kill_consumer(sc, bp->bio_from);
1636 g_topology_unlock();
1637 free(bp->bio_data, M_RAID3);
1638 g_destroy_bio(bp);
1639 sx_xlock(&sc->sc_lock);
1640 return;
1641 }
1642
1643 /*
1644 * Synchronization request.
1645 */
1646 switch (bp->bio_cmd) {
1647 case BIO_READ:
1648 {
1649 struct g_consumer *cp;
1650 u_char *dst, *src;
1651 off_t left;
1652 u_int atom;
1653
1654 if (bp->bio_error != 0) {
1655 G_RAID3_LOGREQ(0, bp,
1656 "Synchronization request failed (error=%d).",
1657 bp->bio_error);
1658 g_destroy_bio(bp);
1659 return;
1660 }
1661 G_RAID3_LOGREQ(3, bp, "Synchronization request finished.");
1662 atom = sc->sc_sectorsize / (sc->sc_ndisks - 1);
1663 dst = src = bp->bio_data;
1664 if (disk->d_no == sc->sc_ndisks - 1) {
1665 u_int n;
1666
1667 /* Parity component. */
1668 for (left = bp->bio_length; left > 0;
1669 left -= sc->sc_sectorsize) {
1670 bcopy(src, dst, atom);
1671 src += atom;
1672 for (n = 1; n < sc->sc_ndisks - 1; n++) {
1673 g_raid3_xor(src, dst, atom);
1674 src += atom;
1675 }
1676 dst += atom;
1677 }
1678 } else {
1679 /* Regular component. */
1680 src += atom * disk->d_no;
1681 for (left = bp->bio_length; left > 0;
1682 left -= sc->sc_sectorsize) {
1683 bcopy(src, dst, atom);
1684 src += sc->sc_sectorsize;
1685 dst += atom;
1686 }
1687 }
1688 bp->bio_driver1 = bp->bio_driver2 = NULL;
1689 bp->bio_pflags = 0;
1690 bp->bio_offset /= sc->sc_ndisks - 1;
1691 bp->bio_length /= sc->sc_ndisks - 1;
1692 bp->bio_cmd = BIO_WRITE;
1693 bp->bio_cflags = 0;
1694 bp->bio_children = bp->bio_inbed = 0;
1695 cp = disk->d_consumer;
1696 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1697 ("Consumer %s not opened (r%dw%de%d).", cp->provider->name,
1698 cp->acr, cp->acw, cp->ace));
1699 cp->index++;
1700 g_io_request(bp, cp);
1701 return;
1702 }
1703 case BIO_WRITE:
1704 {
1705 struct g_raid3_disk_sync *sync;
1706 off_t boffset, moffset;
1707 void *data;
1708 int i;
1709
1710 if (bp->bio_error != 0) {
1711 G_RAID3_LOGREQ(0, bp,
1712 "Synchronization request failed (error=%d).",
1713 bp->bio_error);
1714 g_destroy_bio(bp);
1715 sc->sc_bump_id |= G_RAID3_BUMP_GENID;
1716 g_raid3_event_send(disk,
1717 G_RAID3_DISK_STATE_DISCONNECTED,
1718 G_RAID3_EVENT_DONTWAIT);
1719 return;
1720 }
1721 G_RAID3_LOGREQ(3, bp, "Synchronization request finished.");
1722 sync = &disk->d_sync;
1723 if (sync->ds_offset == sc->sc_mediasize / (sc->sc_ndisks - 1) ||
1724 sync->ds_consumer == NULL ||
1725 (sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
1726 /* Don't send more synchronization requests. */
1727 sync->ds_inflight--;
1728 if (sync->ds_bios != NULL) {
1729 i = (int)(uintptr_t)bp->bio_caller1;
1730 sync->ds_bios[i] = NULL;
1731 }
1732 free(bp->bio_data, M_RAID3);
1733 g_destroy_bio(bp);
1734 if (sync->ds_inflight > 0)
1735 return;
1736 if (sync->ds_consumer == NULL ||
1737 (sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
1738 return;
1739 }
1740 /*
1741 * Disk up-to-date, activate it.
1742 */
1743 g_raid3_event_send(disk, G_RAID3_DISK_STATE_ACTIVE,
1744 G_RAID3_EVENT_DONTWAIT);
1745 return;
1746 }
1747
1748 /* Send next synchronization request. */
1749 data = bp->bio_data;
1750 g_reset_bio(bp);
1751 bp->bio_cmd = BIO_READ;
1752 bp->bio_offset = sync->ds_offset * (sc->sc_ndisks - 1);
1753 bp->bio_length = MIN(maxphys, sc->sc_mediasize - bp->bio_offset);
1754 sync->ds_offset += bp->bio_length / (sc->sc_ndisks - 1);
1755 bp->bio_done = g_raid3_sync_done;
1756 bp->bio_data = data;
1757 bp->bio_from = sync->ds_consumer;
1758 bp->bio_to = sc->sc_provider;
1759 G_RAID3_LOGREQ(3, bp, "Sending synchronization request.");
1760 sync->ds_consumer->index++;
1761 /*
1762 * Delay the request if it is colliding with a regular request.
1763 */
1764 if (g_raid3_regular_collision(sc, bp))
1765 g_raid3_sync_delay(sc, bp);
1766 else
1767 g_io_request(bp, sync->ds_consumer);
1768
1769 /* Release delayed requests if possible. */
1770 g_raid3_regular_release(sc);
1771
1772 /* Find the smallest offset. */
1773 moffset = sc->sc_mediasize;
1774 for (i = 0; i < g_raid3_syncreqs; i++) {
1775 bp = sync->ds_bios[i];
1776 boffset = bp->bio_offset;
1777 if (bp->bio_cmd == BIO_WRITE)
1778 boffset *= sc->sc_ndisks - 1;
1779 if (boffset < moffset)
1780 moffset = boffset;
1781 }
1782 if (sync->ds_offset_done + maxphys * 100 < moffset) {
1783 /* Update offset_done on every 100 blocks. */
1784 sync->ds_offset_done = moffset;
1785 g_raid3_update_metadata(disk);
1786 }
1787 return;
1788 }
1789 default:
1790 KASSERT(1 == 0, ("Invalid command here: %u (device=%s)",
1791 bp->bio_cmd, sc->sc_name));
1792 break;
1793 }
1794 }
1795
1796 static int
g_raid3_register_request(struct bio * pbp)1797 g_raid3_register_request(struct bio *pbp)
1798 {
1799 struct g_raid3_softc *sc;
1800 struct g_raid3_disk *disk;
1801 struct g_consumer *cp;
1802 struct bio *cbp, *tmpbp;
1803 off_t offset, length;
1804 u_int n, ndisks;
1805 int round_robin, verify;
1806
1807 ndisks = 0;
1808 sc = pbp->bio_to->private;
1809 if ((pbp->bio_cflags & G_RAID3_BIO_CFLAG_REGSYNC) != 0 &&
1810 sc->sc_syncdisk == NULL) {
1811 g_io_deliver(pbp, EIO);
1812 return (0);
1813 }
1814 g_raid3_init_bio(pbp);
1815 length = pbp->bio_length / (sc->sc_ndisks - 1);
1816 offset = pbp->bio_offset / (sc->sc_ndisks - 1);
1817 round_robin = verify = 0;
1818 switch (pbp->bio_cmd) {
1819 case BIO_READ:
1820 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_VERIFY) != 0 &&
1821 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1822 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_VERIFY;
1823 verify = 1;
1824 ndisks = sc->sc_ndisks;
1825 } else {
1826 verify = 0;
1827 ndisks = sc->sc_ndisks - 1;
1828 }
1829 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0 &&
1830 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
1831 round_robin = 1;
1832 } else {
1833 round_robin = 0;
1834 }
1835 KASSERT(!round_robin || !verify,
1836 ("ROUND-ROBIN and VERIFY are mutually exclusive."));
1837 pbp->bio_driver2 = &sc->sc_disks[sc->sc_ndisks - 1];
1838 break;
1839 case BIO_WRITE:
1840 case BIO_DELETE:
1841 /*
1842 * Delay the request if it is colliding with a synchronization
1843 * request.
1844 */
1845 if (g_raid3_sync_collision(sc, pbp)) {
1846 g_raid3_regular_delay(sc, pbp);
1847 return (0);
1848 }
1849
1850 if (sc->sc_idle)
1851 g_raid3_unidle(sc);
1852 else
1853 sc->sc_last_write = time_uptime;
1854
1855 ndisks = sc->sc_ndisks;
1856 break;
1857 }
1858 for (n = 0; n < ndisks; n++) {
1859 disk = &sc->sc_disks[n];
1860 cbp = g_raid3_clone_bio(sc, pbp);
1861 if (cbp == NULL) {
1862 while ((cbp = G_RAID3_HEAD_BIO(pbp)) != NULL)
1863 g_raid3_destroy_bio(sc, cbp);
1864 /*
1865 * To prevent deadlock, we must run back up
1866 * with the ENOMEM for failed requests of any
1867 * of our consumers. Our own sync requests
1868 * can stick around, as they are finite.
1869 */
1870 if ((pbp->bio_cflags &
1871 G_RAID3_BIO_CFLAG_REGULAR) != 0) {
1872 g_io_deliver(pbp, ENOMEM);
1873 return (0);
1874 }
1875 return (ENOMEM);
1876 }
1877 cbp->bio_offset = offset;
1878 cbp->bio_length = length;
1879 cbp->bio_done = g_raid3_done;
1880 switch (pbp->bio_cmd) {
1881 case BIO_READ:
1882 if (disk->d_state != G_RAID3_DISK_STATE_ACTIVE) {
1883 /*
1884 * Replace invalid component with the parity
1885 * component.
1886 */
1887 disk = &sc->sc_disks[sc->sc_ndisks - 1];
1888 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1889 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1890 } else if (round_robin &&
1891 disk->d_no == sc->sc_round_robin) {
1892 /*
1893 * In round-robin mode skip one data component
1894 * and use parity component when reading.
1895 */
1896 pbp->bio_driver2 = disk;
1897 disk = &sc->sc_disks[sc->sc_ndisks - 1];
1898 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1899 sc->sc_round_robin++;
1900 round_robin = 0;
1901 } else if (verify && disk->d_no == sc->sc_ndisks - 1) {
1902 cbp->bio_cflags |= G_RAID3_BIO_CFLAG_PARITY;
1903 }
1904 break;
1905 case BIO_WRITE:
1906 case BIO_DELETE:
1907 if (disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
1908 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
1909 if (n == ndisks - 1) {
1910 /*
1911 * Active parity component, mark it as such.
1912 */
1913 cbp->bio_cflags |=
1914 G_RAID3_BIO_CFLAG_PARITY;
1915 }
1916 } else {
1917 pbp->bio_pflags |= G_RAID3_BIO_PFLAG_DEGRADED;
1918 if (n == ndisks - 1) {
1919 /*
1920 * Parity component is not connected,
1921 * so destroy its request.
1922 */
1923 pbp->bio_pflags |=
1924 G_RAID3_BIO_PFLAG_NOPARITY;
1925 g_raid3_destroy_bio(sc, cbp);
1926 cbp = NULL;
1927 } else {
1928 cbp->bio_cflags |=
1929 G_RAID3_BIO_CFLAG_NODISK;
1930 disk = NULL;
1931 }
1932 }
1933 break;
1934 }
1935 if (cbp != NULL)
1936 cbp->bio_caller2 = disk;
1937 }
1938 switch (pbp->bio_cmd) {
1939 case BIO_READ:
1940 if (round_robin) {
1941 /*
1942 * If we are in round-robin mode and 'round_robin' is
1943 * still 1, it means, that we skipped parity component
1944 * for this read and must reset sc_round_robin field.
1945 */
1946 sc->sc_round_robin = 0;
1947 }
1948 G_RAID3_FOREACH_SAFE_BIO(pbp, cbp, tmpbp) {
1949 disk = cbp->bio_caller2;
1950 cp = disk->d_consumer;
1951 cbp->bio_to = cp->provider;
1952 G_RAID3_LOGREQ(3, cbp, "Sending request.");
1953 KASSERT(cp->acr >= 1 && cp->acw >= 1 && cp->ace >= 1,
1954 ("Consumer %s not opened (r%dw%de%d).",
1955 cp->provider->name, cp->acr, cp->acw, cp->ace));
1956 cp->index++;
1957 g_io_request(cbp, cp);
1958 }
1959 break;
1960 case BIO_WRITE:
1961 case BIO_DELETE:
1962 /*
1963 * Put request onto inflight queue, so we can check if new
1964 * synchronization requests don't collide with it.
1965 */
1966 bioq_insert_tail(&sc->sc_inflight, pbp);
1967
1968 /*
1969 * Bump syncid on first write.
1970 */
1971 if ((sc->sc_bump_id & G_RAID3_BUMP_SYNCID) != 0) {
1972 sc->sc_bump_id &= ~G_RAID3_BUMP_SYNCID;
1973 g_raid3_bump_syncid(sc);
1974 }
1975 g_raid3_scatter(pbp);
1976 break;
1977 }
1978 return (0);
1979 }
1980
1981 static int
g_raid3_can_destroy(struct g_raid3_softc * sc)1982 g_raid3_can_destroy(struct g_raid3_softc *sc)
1983 {
1984 struct g_geom *gp;
1985 struct g_consumer *cp;
1986
1987 g_topology_assert();
1988 gp = sc->sc_geom;
1989 if (gp->softc == NULL)
1990 return (1);
1991 LIST_FOREACH(cp, &gp->consumer, consumer) {
1992 if (g_raid3_is_busy(sc, cp))
1993 return (0);
1994 }
1995 gp = sc->sc_sync.ds_geom;
1996 LIST_FOREACH(cp, &gp->consumer, consumer) {
1997 if (g_raid3_is_busy(sc, cp))
1998 return (0);
1999 }
2000 G_RAID3_DEBUG(2, "No I/O requests for %s, it can be destroyed.",
2001 sc->sc_name);
2002 return (1);
2003 }
2004
2005 static int
g_raid3_try_destroy(struct g_raid3_softc * sc)2006 g_raid3_try_destroy(struct g_raid3_softc *sc)
2007 {
2008
2009 g_topology_assert_not();
2010 sx_assert(&sc->sc_lock, SX_XLOCKED);
2011
2012 if (sc->sc_rootmount != NULL) {
2013 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2014 sc->sc_rootmount);
2015 root_mount_rel(sc->sc_rootmount);
2016 sc->sc_rootmount = NULL;
2017 }
2018
2019 g_topology_lock();
2020 if (!g_raid3_can_destroy(sc)) {
2021 g_topology_unlock();
2022 return (0);
2023 }
2024 sc->sc_geom->softc = NULL;
2025 sc->sc_sync.ds_geom->softc = NULL;
2026 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_WAIT) != 0) {
2027 g_topology_unlock();
2028 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__,
2029 &sc->sc_worker);
2030 /* Unlock sc_lock here, as it can be destroyed after wakeup. */
2031 sx_xunlock(&sc->sc_lock);
2032 wakeup(&sc->sc_worker);
2033 sc->sc_worker = NULL;
2034 } else {
2035 g_topology_unlock();
2036 g_raid3_destroy_device(sc);
2037 }
2038 return (1);
2039 }
2040
2041 /*
2042 * Worker thread.
2043 */
2044 static void
g_raid3_worker(void * arg)2045 g_raid3_worker(void *arg)
2046 {
2047 struct g_raid3_softc *sc;
2048 struct g_raid3_event *ep;
2049 struct bio *bp;
2050 int timeout;
2051
2052 sc = arg;
2053 thread_lock(curthread);
2054 sched_prio(curthread, PRIBIO);
2055 thread_unlock(curthread);
2056
2057 sx_xlock(&sc->sc_lock);
2058 for (;;) {
2059 G_RAID3_DEBUG(5, "%s: Let's see...", __func__);
2060 /*
2061 * First take a look at events.
2062 * This is important to handle events before any I/O requests.
2063 */
2064 ep = g_raid3_event_get(sc);
2065 if (ep != NULL) {
2066 g_raid3_event_remove(sc, ep);
2067 if ((ep->e_flags & G_RAID3_EVENT_DEVICE) != 0) {
2068 /* Update only device status. */
2069 G_RAID3_DEBUG(3,
2070 "Running event for device %s.",
2071 sc->sc_name);
2072 ep->e_error = 0;
2073 g_raid3_update_device(sc, 1);
2074 } else {
2075 /* Update disk status. */
2076 G_RAID3_DEBUG(3, "Running event for disk %s.",
2077 g_raid3_get_diskname(ep->e_disk));
2078 ep->e_error = g_raid3_update_disk(ep->e_disk,
2079 ep->e_state);
2080 if (ep->e_error == 0)
2081 g_raid3_update_device(sc, 0);
2082 }
2083 if ((ep->e_flags & G_RAID3_EVENT_DONTWAIT) != 0) {
2084 KASSERT(ep->e_error == 0,
2085 ("Error cannot be handled."));
2086 g_raid3_event_free(ep);
2087 } else {
2088 ep->e_flags |= G_RAID3_EVENT_DONE;
2089 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__,
2090 ep);
2091 mtx_lock(&sc->sc_events_mtx);
2092 wakeup(ep);
2093 mtx_unlock(&sc->sc_events_mtx);
2094 }
2095 if ((sc->sc_flags &
2096 G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
2097 if (g_raid3_try_destroy(sc)) {
2098 curthread->td_pflags &= ~TDP_GEOM;
2099 G_RAID3_DEBUG(1, "Thread exiting.");
2100 kproc_exit(0);
2101 }
2102 }
2103 G_RAID3_DEBUG(5, "%s: I'm here 1.", __func__);
2104 continue;
2105 }
2106 /*
2107 * Check if we can mark array as CLEAN and if we can't take
2108 * how much seconds should we wait.
2109 */
2110 timeout = g_raid3_idle(sc, -1);
2111 /*
2112 * Now I/O requests.
2113 */
2114 /* Get first request from the queue. */
2115 mtx_lock(&sc->sc_queue_mtx);
2116 bp = bioq_first(&sc->sc_queue);
2117 if (bp == NULL) {
2118 if ((sc->sc_flags &
2119 G_RAID3_DEVICE_FLAG_DESTROY) != 0) {
2120 mtx_unlock(&sc->sc_queue_mtx);
2121 if (g_raid3_try_destroy(sc)) {
2122 curthread->td_pflags &= ~TDP_GEOM;
2123 G_RAID3_DEBUG(1, "Thread exiting.");
2124 kproc_exit(0);
2125 }
2126 mtx_lock(&sc->sc_queue_mtx);
2127 }
2128 sx_xunlock(&sc->sc_lock);
2129 /*
2130 * XXX: We can miss an event here, because an event
2131 * can be added without sx-device-lock and without
2132 * mtx-queue-lock. Maybe I should just stop using
2133 * dedicated mutex for events synchronization and
2134 * stick with the queue lock?
2135 * The event will hang here until next I/O request
2136 * or next event is received.
2137 */
2138 MSLEEP(sc, &sc->sc_queue_mtx, PRIBIO | PDROP, "r3:w1",
2139 timeout * hz);
2140 sx_xlock(&sc->sc_lock);
2141 G_RAID3_DEBUG(5, "%s: I'm here 4.", __func__);
2142 continue;
2143 }
2144 process:
2145 bioq_remove(&sc->sc_queue, bp);
2146 mtx_unlock(&sc->sc_queue_mtx);
2147
2148 if (bp->bio_from->geom == sc->sc_sync.ds_geom &&
2149 (bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC) != 0) {
2150 g_raid3_sync_request(bp); /* READ */
2151 } else if (bp->bio_to != sc->sc_provider) {
2152 if ((bp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR) != 0)
2153 g_raid3_regular_request(bp);
2154 else if ((bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC) != 0)
2155 g_raid3_sync_request(bp); /* WRITE */
2156 else {
2157 KASSERT(0,
2158 ("Invalid request cflags=0x%hx to=%s.",
2159 bp->bio_cflags, bp->bio_to->name));
2160 }
2161 } else if (g_raid3_register_request(bp) != 0) {
2162 mtx_lock(&sc->sc_queue_mtx);
2163 bioq_insert_head(&sc->sc_queue, bp);
2164 /*
2165 * We are short in memory, let see if there are finished
2166 * request we can free.
2167 */
2168 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
2169 if (bp->bio_cflags & G_RAID3_BIO_CFLAG_REGULAR)
2170 goto process;
2171 }
2172 /*
2173 * No finished regular request, so at least keep
2174 * synchronization running.
2175 */
2176 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
2177 if (bp->bio_cflags & G_RAID3_BIO_CFLAG_SYNC)
2178 goto process;
2179 }
2180 sx_xunlock(&sc->sc_lock);
2181 MSLEEP(&sc->sc_queue, &sc->sc_queue_mtx, PRIBIO | PDROP,
2182 "r3:lowmem", hz / 10);
2183 sx_xlock(&sc->sc_lock);
2184 }
2185 G_RAID3_DEBUG(5, "%s: I'm here 9.", __func__);
2186 }
2187 }
2188
2189 static void
g_raid3_update_idle(struct g_raid3_softc * sc,struct g_raid3_disk * disk)2190 g_raid3_update_idle(struct g_raid3_softc *sc, struct g_raid3_disk *disk)
2191 {
2192
2193 sx_assert(&sc->sc_lock, SX_LOCKED);
2194 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) != 0)
2195 return;
2196 if (!sc->sc_idle && (disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) == 0) {
2197 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as dirty.",
2198 g_raid3_get_diskname(disk), sc->sc_name);
2199 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
2200 } else if (sc->sc_idle &&
2201 (disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) != 0) {
2202 G_RAID3_DEBUG(1, "Disk %s (device %s) marked as clean.",
2203 g_raid3_get_diskname(disk), sc->sc_name);
2204 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2205 }
2206 }
2207
2208 static void
g_raid3_sync_start(struct g_raid3_softc * sc)2209 g_raid3_sync_start(struct g_raid3_softc *sc)
2210 {
2211 struct g_raid3_disk *disk;
2212 struct g_consumer *cp;
2213 struct bio *bp;
2214 int error __diagused;
2215 u_int n;
2216
2217 g_topology_assert_not();
2218 sx_assert(&sc->sc_lock, SX_XLOCKED);
2219
2220 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED,
2221 ("Device not in DEGRADED state (%s, %u).", sc->sc_name,
2222 sc->sc_state));
2223 KASSERT(sc->sc_syncdisk == NULL, ("Syncdisk is not NULL (%s, %u).",
2224 sc->sc_name, sc->sc_state));
2225 disk = NULL;
2226 for (n = 0; n < sc->sc_ndisks; n++) {
2227 if (sc->sc_disks[n].d_state != G_RAID3_DISK_STATE_SYNCHRONIZING)
2228 continue;
2229 disk = &sc->sc_disks[n];
2230 break;
2231 }
2232 if (disk == NULL)
2233 return;
2234
2235 sx_xunlock(&sc->sc_lock);
2236 g_topology_lock();
2237 cp = g_new_consumer(sc->sc_sync.ds_geom);
2238 error = g_attach(cp, sc->sc_provider);
2239 KASSERT(error == 0,
2240 ("Cannot attach to %s (error=%d).", sc->sc_name, error));
2241 error = g_access(cp, 1, 0, 0);
2242 KASSERT(error == 0, ("Cannot open %s (error=%d).", sc->sc_name, error));
2243 g_topology_unlock();
2244 sx_xlock(&sc->sc_lock);
2245
2246 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s.", sc->sc_name,
2247 g_raid3_get_diskname(disk));
2248 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOFAILSYNC) == 0)
2249 disk->d_flags |= G_RAID3_DISK_FLAG_DIRTY;
2250 KASSERT(disk->d_sync.ds_consumer == NULL,
2251 ("Sync consumer already exists (device=%s, disk=%s).",
2252 sc->sc_name, g_raid3_get_diskname(disk)));
2253
2254 disk->d_sync.ds_consumer = cp;
2255 disk->d_sync.ds_consumer->private = disk;
2256 disk->d_sync.ds_consumer->index = 0;
2257 sc->sc_syncdisk = disk;
2258
2259 /*
2260 * Allocate memory for synchronization bios and initialize them.
2261 */
2262 disk->d_sync.ds_bios = malloc(sizeof(struct bio *) * g_raid3_syncreqs,
2263 M_RAID3, M_WAITOK);
2264 for (n = 0; n < g_raid3_syncreqs; n++) {
2265 bp = g_alloc_bio();
2266 disk->d_sync.ds_bios[n] = bp;
2267 bp->bio_parent = NULL;
2268 bp->bio_cmd = BIO_READ;
2269 bp->bio_data = malloc(maxphys, M_RAID3, M_WAITOK);
2270 bp->bio_cflags = 0;
2271 bp->bio_offset = disk->d_sync.ds_offset * (sc->sc_ndisks - 1);
2272 bp->bio_length = MIN(maxphys, sc->sc_mediasize - bp->bio_offset);
2273 disk->d_sync.ds_offset += bp->bio_length / (sc->sc_ndisks - 1);
2274 bp->bio_done = g_raid3_sync_done;
2275 bp->bio_from = disk->d_sync.ds_consumer;
2276 bp->bio_to = sc->sc_provider;
2277 bp->bio_caller1 = (void *)(uintptr_t)n;
2278 }
2279
2280 /* Set the number of in-flight synchronization requests. */
2281 disk->d_sync.ds_inflight = g_raid3_syncreqs;
2282
2283 /*
2284 * Fire off first synchronization requests.
2285 */
2286 for (n = 0; n < g_raid3_syncreqs; n++) {
2287 bp = disk->d_sync.ds_bios[n];
2288 G_RAID3_LOGREQ(3, bp, "Sending synchronization request.");
2289 disk->d_sync.ds_consumer->index++;
2290 /*
2291 * Delay the request if it is colliding with a regular request.
2292 */
2293 if (g_raid3_regular_collision(sc, bp))
2294 g_raid3_sync_delay(sc, bp);
2295 else
2296 g_io_request(bp, disk->d_sync.ds_consumer);
2297 }
2298 }
2299
2300 /*
2301 * Stop synchronization process.
2302 * type: 0 - synchronization finished
2303 * 1 - synchronization stopped
2304 */
2305 static void
g_raid3_sync_stop(struct g_raid3_softc * sc,int type)2306 g_raid3_sync_stop(struct g_raid3_softc *sc, int type)
2307 {
2308 struct g_raid3_disk *disk;
2309 struct g_consumer *cp;
2310
2311 g_topology_assert_not();
2312 sx_assert(&sc->sc_lock, SX_LOCKED);
2313
2314 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED,
2315 ("Device not in DEGRADED state (%s, %u).", sc->sc_name,
2316 sc->sc_state));
2317 disk = sc->sc_syncdisk;
2318 sc->sc_syncdisk = NULL;
2319 KASSERT(disk != NULL, ("No disk was synchronized (%s).", sc->sc_name));
2320 KASSERT(disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2321 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2322 g_raid3_disk_state2str(disk->d_state)));
2323 if (disk->d_sync.ds_consumer == NULL)
2324 return;
2325
2326 if (type == 0) {
2327 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s finished.",
2328 sc->sc_name, g_raid3_get_diskname(disk));
2329 } else /* if (type == 1) */ {
2330 G_RAID3_DEBUG(0, "Device %s: rebuilding provider %s stopped.",
2331 sc->sc_name, g_raid3_get_diskname(disk));
2332 }
2333 free(disk->d_sync.ds_bios, M_RAID3);
2334 disk->d_sync.ds_bios = NULL;
2335 cp = disk->d_sync.ds_consumer;
2336 disk->d_sync.ds_consumer = NULL;
2337 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2338 sx_xunlock(&sc->sc_lock); /* Avoid recursion on sc_lock. */
2339 g_topology_lock();
2340 g_raid3_kill_consumer(sc, cp);
2341 g_topology_unlock();
2342 sx_xlock(&sc->sc_lock);
2343 }
2344
2345 static void
g_raid3_launch_provider(struct g_raid3_softc * sc)2346 g_raid3_launch_provider(struct g_raid3_softc *sc)
2347 {
2348 struct g_provider *pp;
2349 struct g_raid3_disk *disk;
2350 int n;
2351
2352 sx_assert(&sc->sc_lock, SX_LOCKED);
2353
2354 g_topology_lock();
2355 pp = g_new_providerf(sc->sc_geom, "raid3/%s", sc->sc_name);
2356 pp->mediasize = sc->sc_mediasize;
2357 pp->sectorsize = sc->sc_sectorsize;
2358 pp->stripesize = 0;
2359 pp->stripeoffset = 0;
2360 for (n = 0; n < sc->sc_ndisks; n++) {
2361 disk = &sc->sc_disks[n];
2362 if (disk->d_consumer && disk->d_consumer->provider &&
2363 disk->d_consumer->provider->stripesize > pp->stripesize) {
2364 pp->stripesize = disk->d_consumer->provider->stripesize;
2365 pp->stripeoffset = disk->d_consumer->provider->stripeoffset;
2366 }
2367 }
2368 pp->stripesize *= sc->sc_ndisks - 1;
2369 pp->stripeoffset *= sc->sc_ndisks - 1;
2370 pp->private = sc;
2371 sc->sc_refcnt++;
2372 sc->sc_provider = pp;
2373 g_error_provider(pp, 0);
2374 g_topology_unlock();
2375 G_RAID3_DEBUG(0, "Device %s launched (%u/%u).", pp->name,
2376 g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE), sc->sc_ndisks);
2377
2378 if (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED)
2379 g_raid3_sync_start(sc);
2380 }
2381
2382 static void
g_raid3_destroy_provider(struct g_raid3_softc * sc)2383 g_raid3_destroy_provider(struct g_raid3_softc *sc)
2384 {
2385 struct bio *bp;
2386
2387 g_topology_assert_not();
2388 KASSERT(sc->sc_provider != NULL, ("NULL provider (device=%s).",
2389 sc->sc_name));
2390
2391 g_topology_lock();
2392 g_error_provider(sc->sc_provider, ENXIO);
2393 mtx_lock(&sc->sc_queue_mtx);
2394 while ((bp = bioq_first(&sc->sc_queue)) != NULL) {
2395 bioq_remove(&sc->sc_queue, bp);
2396 g_io_deliver(bp, ENXIO);
2397 }
2398 mtx_unlock(&sc->sc_queue_mtx);
2399 G_RAID3_DEBUG(0, "Device %s: provider %s destroyed.", sc->sc_name,
2400 sc->sc_provider->name);
2401 g_wither_provider(sc->sc_provider, ENXIO);
2402 g_topology_unlock();
2403 sc->sc_provider = NULL;
2404 if (sc->sc_syncdisk != NULL)
2405 g_raid3_sync_stop(sc, 1);
2406 }
2407
2408 static void
g_raid3_go(void * arg)2409 g_raid3_go(void *arg)
2410 {
2411 struct g_raid3_softc *sc;
2412 struct g_raid3_event *ep;
2413
2414 sc = arg;
2415 G_RAID3_DEBUG(0, "Force device %s start due to timeout.", sc->sc_name);
2416 ep = sc->sc_timeout_event;
2417 sc->sc_timeout_event = NULL;
2418 g_raid3_event_dispatch(ep, sc, 0,
2419 G_RAID3_EVENT_DONTWAIT | G_RAID3_EVENT_DEVICE);
2420 }
2421
2422 static void
g_raid3_timeout_drain(struct g_raid3_softc * sc)2423 g_raid3_timeout_drain(struct g_raid3_softc *sc)
2424 {
2425 sx_assert(&sc->sc_lock, SX_XLOCKED);
2426
2427 callout_drain(&sc->sc_callout);
2428 g_raid3_event_free(sc->sc_timeout_event);
2429 sc->sc_timeout_event = NULL;
2430 }
2431
2432 static u_int
g_raid3_determine_state(struct g_raid3_disk * disk)2433 g_raid3_determine_state(struct g_raid3_disk *disk)
2434 {
2435 struct g_raid3_softc *sc;
2436 u_int state;
2437
2438 sc = disk->d_softc;
2439 if (sc->sc_syncid == disk->d_sync.ds_syncid) {
2440 if ((disk->d_flags &
2441 G_RAID3_DISK_FLAG_SYNCHRONIZING) == 0) {
2442 /* Disk does not need synchronization. */
2443 state = G_RAID3_DISK_STATE_ACTIVE;
2444 } else {
2445 if ((sc->sc_flags &
2446 G_RAID3_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2447 (disk->d_flags &
2448 G_RAID3_DISK_FLAG_FORCE_SYNC) != 0) {
2449 /*
2450 * We can start synchronization from
2451 * the stored offset.
2452 */
2453 state = G_RAID3_DISK_STATE_SYNCHRONIZING;
2454 } else {
2455 state = G_RAID3_DISK_STATE_STALE;
2456 }
2457 }
2458 } else if (disk->d_sync.ds_syncid < sc->sc_syncid) {
2459 /*
2460 * Reset all synchronization data for this disk,
2461 * because if it even was synchronized, it was
2462 * synchronized to disks with different syncid.
2463 */
2464 disk->d_flags |= G_RAID3_DISK_FLAG_SYNCHRONIZING;
2465 disk->d_sync.ds_offset = 0;
2466 disk->d_sync.ds_offset_done = 0;
2467 disk->d_sync.ds_syncid = sc->sc_syncid;
2468 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) == 0 ||
2469 (disk->d_flags & G_RAID3_DISK_FLAG_FORCE_SYNC) != 0) {
2470 state = G_RAID3_DISK_STATE_SYNCHRONIZING;
2471 } else {
2472 state = G_RAID3_DISK_STATE_STALE;
2473 }
2474 } else /* if (sc->sc_syncid < disk->d_sync.ds_syncid) */ {
2475 /*
2476 * Not good, NOT GOOD!
2477 * It means that device was started on stale disks
2478 * and more fresh disk just arrive.
2479 * If there were writes, device is broken, sorry.
2480 * I think the best choice here is don't touch
2481 * this disk and inform the user loudly.
2482 */
2483 G_RAID3_DEBUG(0, "Device %s was started before the freshest "
2484 "disk (%s) arrives!! It will not be connected to the "
2485 "running device.", sc->sc_name,
2486 g_raid3_get_diskname(disk));
2487 g_raid3_destroy_disk(disk);
2488 state = G_RAID3_DISK_STATE_NONE;
2489 /* Return immediately, because disk was destroyed. */
2490 return (state);
2491 }
2492 G_RAID3_DEBUG(3, "State for %s disk: %s.",
2493 g_raid3_get_diskname(disk), g_raid3_disk_state2str(state));
2494 return (state);
2495 }
2496
2497 /*
2498 * Update device state.
2499 */
2500 static void
g_raid3_update_device(struct g_raid3_softc * sc,boolean_t force)2501 g_raid3_update_device(struct g_raid3_softc *sc, boolean_t force)
2502 {
2503 struct g_raid3_disk *disk;
2504 u_int state;
2505
2506 sx_assert(&sc->sc_lock, SX_XLOCKED);
2507
2508 switch (sc->sc_state) {
2509 case G_RAID3_DEVICE_STATE_STARTING:
2510 {
2511 u_int n, ndirty, ndisks, genid, syncid;
2512
2513 KASSERT(sc->sc_provider == NULL,
2514 ("Non-NULL provider in STARTING state (%s).", sc->sc_name));
2515 /*
2516 * Are we ready? We are, if all disks are connected or
2517 * one disk is missing and 'force' is true.
2518 */
2519 if (g_raid3_ndisks(sc, -1) + force == sc->sc_ndisks) {
2520 if (!force)
2521 g_raid3_timeout_drain(sc);
2522 } else {
2523 if (force) {
2524 /*
2525 * Timeout expired, so destroy device.
2526 */
2527 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2528 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p",
2529 __LINE__, sc->sc_rootmount);
2530 root_mount_rel(sc->sc_rootmount);
2531 sc->sc_rootmount = NULL;
2532 }
2533 return;
2534 }
2535
2536 /*
2537 * Find the biggest genid.
2538 */
2539 genid = 0;
2540 for (n = 0; n < sc->sc_ndisks; n++) {
2541 disk = &sc->sc_disks[n];
2542 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2543 continue;
2544 if (disk->d_genid > genid)
2545 genid = disk->d_genid;
2546 }
2547 sc->sc_genid = genid;
2548 /*
2549 * Remove all disks without the biggest genid.
2550 */
2551 for (n = 0; n < sc->sc_ndisks; n++) {
2552 disk = &sc->sc_disks[n];
2553 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2554 continue;
2555 if (disk->d_genid < genid) {
2556 G_RAID3_DEBUG(0,
2557 "Component %s (device %s) broken, skipping.",
2558 g_raid3_get_diskname(disk), sc->sc_name);
2559 g_raid3_destroy_disk(disk);
2560 }
2561 }
2562
2563 /*
2564 * There must be at least 'sc->sc_ndisks - 1' components
2565 * with the same syncid and without SYNCHRONIZING flag.
2566 */
2567
2568 /*
2569 * Find the biggest syncid, number of valid components and
2570 * number of dirty components.
2571 */
2572 ndirty = ndisks = syncid = 0;
2573 for (n = 0; n < sc->sc_ndisks; n++) {
2574 disk = &sc->sc_disks[n];
2575 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2576 continue;
2577 if ((disk->d_flags & G_RAID3_DISK_FLAG_DIRTY) != 0)
2578 ndirty++;
2579 if (disk->d_sync.ds_syncid > syncid) {
2580 syncid = disk->d_sync.ds_syncid;
2581 ndisks = 0;
2582 } else if (disk->d_sync.ds_syncid < syncid) {
2583 continue;
2584 }
2585 if ((disk->d_flags &
2586 G_RAID3_DISK_FLAG_SYNCHRONIZING) != 0) {
2587 continue;
2588 }
2589 ndisks++;
2590 }
2591 /*
2592 * Do we have enough valid components?
2593 */
2594 if (ndisks + 1 < sc->sc_ndisks) {
2595 G_RAID3_DEBUG(0,
2596 "Device %s is broken, too few valid components.",
2597 sc->sc_name);
2598 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2599 return;
2600 }
2601 /*
2602 * If there is one DIRTY component and all disks are present,
2603 * mark it for synchronization. If there is more than one DIRTY
2604 * component, mark parity component for synchronization.
2605 */
2606 if (ndisks == sc->sc_ndisks && ndirty == 1) {
2607 for (n = 0; n < sc->sc_ndisks; n++) {
2608 disk = &sc->sc_disks[n];
2609 if ((disk->d_flags &
2610 G_RAID3_DISK_FLAG_DIRTY) == 0) {
2611 continue;
2612 }
2613 disk->d_flags |=
2614 G_RAID3_DISK_FLAG_SYNCHRONIZING;
2615 }
2616 } else if (ndisks == sc->sc_ndisks && ndirty > 1) {
2617 disk = &sc->sc_disks[sc->sc_ndisks - 1];
2618 disk->d_flags |= G_RAID3_DISK_FLAG_SYNCHRONIZING;
2619 }
2620
2621 sc->sc_syncid = syncid;
2622 if (force) {
2623 /* Remember to bump syncid on first write. */
2624 sc->sc_bump_id |= G_RAID3_BUMP_SYNCID;
2625 }
2626 if (ndisks == sc->sc_ndisks)
2627 state = G_RAID3_DEVICE_STATE_COMPLETE;
2628 else /* if (ndisks == sc->sc_ndisks - 1) */
2629 state = G_RAID3_DEVICE_STATE_DEGRADED;
2630 G_RAID3_DEBUG(1, "Device %s state changed from %s to %s.",
2631 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2632 g_raid3_device_state2str(state));
2633 sc->sc_state = state;
2634 for (n = 0; n < sc->sc_ndisks; n++) {
2635 disk = &sc->sc_disks[n];
2636 if (disk->d_state == G_RAID3_DISK_STATE_NODISK)
2637 continue;
2638 state = g_raid3_determine_state(disk);
2639 g_raid3_event_send(disk, state, G_RAID3_EVENT_DONTWAIT);
2640 if (state == G_RAID3_DISK_STATE_STALE)
2641 sc->sc_bump_id |= G_RAID3_BUMP_SYNCID;
2642 }
2643 break;
2644 }
2645 case G_RAID3_DEVICE_STATE_DEGRADED:
2646 /*
2647 * Genid need to be bumped immediately, so do it here.
2648 */
2649 if ((sc->sc_bump_id & G_RAID3_BUMP_GENID) != 0) {
2650 sc->sc_bump_id &= ~G_RAID3_BUMP_GENID;
2651 g_raid3_bump_genid(sc);
2652 }
2653
2654 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NEW) > 0)
2655 return;
2656 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) <
2657 sc->sc_ndisks - 1) {
2658 if (sc->sc_provider != NULL)
2659 g_raid3_destroy_provider(sc);
2660 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
2661 return;
2662 }
2663 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) ==
2664 sc->sc_ndisks) {
2665 state = G_RAID3_DEVICE_STATE_COMPLETE;
2666 G_RAID3_DEBUG(1,
2667 "Device %s state changed from %s to %s.",
2668 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2669 g_raid3_device_state2str(state));
2670 sc->sc_state = state;
2671 }
2672 if (sc->sc_provider == NULL)
2673 g_raid3_launch_provider(sc);
2674 if (sc->sc_rootmount != NULL) {
2675 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2676 sc->sc_rootmount);
2677 root_mount_rel(sc->sc_rootmount);
2678 sc->sc_rootmount = NULL;
2679 }
2680 break;
2681 case G_RAID3_DEVICE_STATE_COMPLETE:
2682 /*
2683 * Genid need to be bumped immediately, so do it here.
2684 */
2685 if ((sc->sc_bump_id & G_RAID3_BUMP_GENID) != 0) {
2686 sc->sc_bump_id &= ~G_RAID3_BUMP_GENID;
2687 g_raid3_bump_genid(sc);
2688 }
2689
2690 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NEW) > 0)
2691 return;
2692 KASSERT(g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) >=
2693 sc->sc_ndisks - 1,
2694 ("Too few ACTIVE components in COMPLETE state (device %s).",
2695 sc->sc_name));
2696 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) ==
2697 sc->sc_ndisks - 1) {
2698 state = G_RAID3_DEVICE_STATE_DEGRADED;
2699 G_RAID3_DEBUG(1,
2700 "Device %s state changed from %s to %s.",
2701 sc->sc_name, g_raid3_device_state2str(sc->sc_state),
2702 g_raid3_device_state2str(state));
2703 sc->sc_state = state;
2704 }
2705 if (sc->sc_provider == NULL)
2706 g_raid3_launch_provider(sc);
2707 if (sc->sc_rootmount != NULL) {
2708 G_RAID3_DEBUG(1, "root_mount_rel[%u] %p", __LINE__,
2709 sc->sc_rootmount);
2710 root_mount_rel(sc->sc_rootmount);
2711 sc->sc_rootmount = NULL;
2712 }
2713 break;
2714 default:
2715 KASSERT(1 == 0, ("Wrong device state (%s, %s).", sc->sc_name,
2716 g_raid3_device_state2str(sc->sc_state)));
2717 break;
2718 }
2719 }
2720
2721 /*
2722 * Update disk state and device state if needed.
2723 */
2724 #define DISK_STATE_CHANGED() G_RAID3_DEBUG(1, \
2725 "Disk %s state changed from %s to %s (device %s).", \
2726 g_raid3_get_diskname(disk), \
2727 g_raid3_disk_state2str(disk->d_state), \
2728 g_raid3_disk_state2str(state), sc->sc_name)
2729 static int
g_raid3_update_disk(struct g_raid3_disk * disk,u_int state)2730 g_raid3_update_disk(struct g_raid3_disk *disk, u_int state)
2731 {
2732 struct g_raid3_softc *sc;
2733
2734 sc = disk->d_softc;
2735 sx_assert(&sc->sc_lock, SX_XLOCKED);
2736
2737 again:
2738 G_RAID3_DEBUG(3, "Changing disk %s state from %s to %s.",
2739 g_raid3_get_diskname(disk), g_raid3_disk_state2str(disk->d_state),
2740 g_raid3_disk_state2str(state));
2741 switch (state) {
2742 case G_RAID3_DISK_STATE_NEW:
2743 /*
2744 * Possible scenarios:
2745 * 1. New disk arrive.
2746 */
2747 /* Previous state should be NONE. */
2748 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NONE,
2749 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2750 g_raid3_disk_state2str(disk->d_state)));
2751 DISK_STATE_CHANGED();
2752
2753 disk->d_state = state;
2754 G_RAID3_DEBUG(1, "Device %s: provider %s detected.",
2755 sc->sc_name, g_raid3_get_diskname(disk));
2756 if (sc->sc_state == G_RAID3_DEVICE_STATE_STARTING)
2757 break;
2758 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2759 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2760 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2761 g_raid3_device_state2str(sc->sc_state),
2762 g_raid3_get_diskname(disk),
2763 g_raid3_disk_state2str(disk->d_state)));
2764 state = g_raid3_determine_state(disk);
2765 if (state != G_RAID3_DISK_STATE_NONE)
2766 goto again;
2767 break;
2768 case G_RAID3_DISK_STATE_ACTIVE:
2769 /*
2770 * Possible scenarios:
2771 * 1. New disk does not need synchronization.
2772 * 2. Synchronization process finished successfully.
2773 */
2774 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2775 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2776 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2777 g_raid3_device_state2str(sc->sc_state),
2778 g_raid3_get_diskname(disk),
2779 g_raid3_disk_state2str(disk->d_state)));
2780 /* Previous state should be NEW or SYNCHRONIZING. */
2781 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW ||
2782 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2783 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2784 g_raid3_disk_state2str(disk->d_state)));
2785 DISK_STATE_CHANGED();
2786
2787 if (disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
2788 disk->d_flags &= ~G_RAID3_DISK_FLAG_SYNCHRONIZING;
2789 disk->d_flags &= ~G_RAID3_DISK_FLAG_FORCE_SYNC;
2790 g_raid3_sync_stop(sc, 0);
2791 }
2792 disk->d_state = state;
2793 disk->d_sync.ds_offset = 0;
2794 disk->d_sync.ds_offset_done = 0;
2795 g_raid3_update_idle(sc, disk);
2796 g_raid3_update_metadata(disk);
2797 G_RAID3_DEBUG(1, "Device %s: provider %s activated.",
2798 sc->sc_name, g_raid3_get_diskname(disk));
2799 break;
2800 case G_RAID3_DISK_STATE_STALE:
2801 /*
2802 * Possible scenarios:
2803 * 1. Stale disk was connected.
2804 */
2805 /* Previous state should be NEW. */
2806 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2807 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2808 g_raid3_disk_state2str(disk->d_state)));
2809 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2810 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2811 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2812 g_raid3_device_state2str(sc->sc_state),
2813 g_raid3_get_diskname(disk),
2814 g_raid3_disk_state2str(disk->d_state)));
2815 /*
2816 * STALE state is only possible if device is marked
2817 * NOAUTOSYNC.
2818 */
2819 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_NOAUTOSYNC) != 0,
2820 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2821 g_raid3_device_state2str(sc->sc_state),
2822 g_raid3_get_diskname(disk),
2823 g_raid3_disk_state2str(disk->d_state)));
2824 DISK_STATE_CHANGED();
2825
2826 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2827 disk->d_state = state;
2828 g_raid3_update_metadata(disk);
2829 G_RAID3_DEBUG(0, "Device %s: provider %s is stale.",
2830 sc->sc_name, g_raid3_get_diskname(disk));
2831 break;
2832 case G_RAID3_DISK_STATE_SYNCHRONIZING:
2833 /*
2834 * Possible scenarios:
2835 * 1. Disk which needs synchronization was connected.
2836 */
2837 /* Previous state should be NEW. */
2838 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2839 ("Wrong disk state (%s, %s).", g_raid3_get_diskname(disk),
2840 g_raid3_disk_state2str(disk->d_state)));
2841 KASSERT(sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2842 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE,
2843 ("Wrong device state (%s, %s, %s, %s).", sc->sc_name,
2844 g_raid3_device_state2str(sc->sc_state),
2845 g_raid3_get_diskname(disk),
2846 g_raid3_disk_state2str(disk->d_state)));
2847 DISK_STATE_CHANGED();
2848
2849 if (disk->d_state == G_RAID3_DISK_STATE_NEW)
2850 disk->d_flags &= ~G_RAID3_DISK_FLAG_DIRTY;
2851 disk->d_state = state;
2852 if (sc->sc_provider != NULL) {
2853 g_raid3_sync_start(sc);
2854 g_raid3_update_metadata(disk);
2855 }
2856 break;
2857 case G_RAID3_DISK_STATE_DISCONNECTED:
2858 /*
2859 * Possible scenarios:
2860 * 1. Device wasn't running yet, but disk disappear.
2861 * 2. Disk was active and disapppear.
2862 * 3. Disk disappear during synchronization process.
2863 */
2864 if (sc->sc_state == G_RAID3_DEVICE_STATE_DEGRADED ||
2865 sc->sc_state == G_RAID3_DEVICE_STATE_COMPLETE) {
2866 /*
2867 * Previous state should be ACTIVE, STALE or
2868 * SYNCHRONIZING.
2869 */
2870 KASSERT(disk->d_state == G_RAID3_DISK_STATE_ACTIVE ||
2871 disk->d_state == G_RAID3_DISK_STATE_STALE ||
2872 disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING,
2873 ("Wrong disk state (%s, %s).",
2874 g_raid3_get_diskname(disk),
2875 g_raid3_disk_state2str(disk->d_state)));
2876 } else if (sc->sc_state == G_RAID3_DEVICE_STATE_STARTING) {
2877 /* Previous state should be NEW. */
2878 KASSERT(disk->d_state == G_RAID3_DISK_STATE_NEW,
2879 ("Wrong disk state (%s, %s).",
2880 g_raid3_get_diskname(disk),
2881 g_raid3_disk_state2str(disk->d_state)));
2882 /*
2883 * Reset bumping syncid if disk disappeared in STARTING
2884 * state.
2885 */
2886 if ((sc->sc_bump_id & G_RAID3_BUMP_SYNCID) != 0)
2887 sc->sc_bump_id &= ~G_RAID3_BUMP_SYNCID;
2888 #ifdef INVARIANTS
2889 } else {
2890 KASSERT(1 == 0, ("Wrong device state (%s, %s, %s, %s).",
2891 sc->sc_name,
2892 g_raid3_device_state2str(sc->sc_state),
2893 g_raid3_get_diskname(disk),
2894 g_raid3_disk_state2str(disk->d_state)));
2895 #endif
2896 }
2897 DISK_STATE_CHANGED();
2898 G_RAID3_DEBUG(0, "Device %s: provider %s disconnected.",
2899 sc->sc_name, g_raid3_get_diskname(disk));
2900
2901 g_raid3_destroy_disk(disk);
2902 break;
2903 default:
2904 KASSERT(1 == 0, ("Unknown state (%u).", state));
2905 break;
2906 }
2907 return (0);
2908 }
2909 #undef DISK_STATE_CHANGED
2910
2911 int
g_raid3_read_metadata(struct g_consumer * cp,struct g_raid3_metadata * md)2912 g_raid3_read_metadata(struct g_consumer *cp, struct g_raid3_metadata *md)
2913 {
2914 struct g_provider *pp;
2915 u_char *buf;
2916 int error;
2917
2918 g_topology_assert();
2919
2920 error = g_access(cp, 1, 0, 0);
2921 if (error != 0)
2922 return (error);
2923 pp = cp->provider;
2924 g_topology_unlock();
2925 /* Metadata are stored on last sector. */
2926 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
2927 &error);
2928 g_topology_lock();
2929 g_access(cp, -1, 0, 0);
2930 if (buf == NULL) {
2931 G_RAID3_DEBUG(1, "Cannot read metadata from %s (error=%d).",
2932 cp->provider->name, error);
2933 return (error);
2934 }
2935
2936 /* Decode metadata. */
2937 error = raid3_metadata_decode(buf, md);
2938 g_free(buf);
2939 if (strcmp(md->md_magic, G_RAID3_MAGIC) != 0)
2940 return (EINVAL);
2941 if (md->md_version > G_RAID3_VERSION) {
2942 G_RAID3_DEBUG(0,
2943 "Kernel module is too old to handle metadata from %s.",
2944 cp->provider->name);
2945 return (EINVAL);
2946 }
2947 if (error != 0) {
2948 G_RAID3_DEBUG(1, "MD5 metadata hash mismatch for provider %s.",
2949 cp->provider->name);
2950 return (error);
2951 }
2952 if (md->md_sectorsize > maxphys) {
2953 G_RAID3_DEBUG(0, "The blocksize is too big.");
2954 return (EINVAL);
2955 }
2956
2957 return (0);
2958 }
2959
2960 static int
g_raid3_check_metadata(struct g_raid3_softc * sc,struct g_provider * pp,struct g_raid3_metadata * md)2961 g_raid3_check_metadata(struct g_raid3_softc *sc, struct g_provider *pp,
2962 struct g_raid3_metadata *md)
2963 {
2964
2965 if (md->md_no >= sc->sc_ndisks) {
2966 G_RAID3_DEBUG(1, "Invalid disk %s number (no=%u), skipping.",
2967 pp->name, md->md_no);
2968 return (EINVAL);
2969 }
2970 if (sc->sc_disks[md->md_no].d_state != G_RAID3_DISK_STATE_NODISK) {
2971 G_RAID3_DEBUG(1, "Disk %s (no=%u) already exists, skipping.",
2972 pp->name, md->md_no);
2973 return (EEXIST);
2974 }
2975 if (md->md_all != sc->sc_ndisks) {
2976 G_RAID3_DEBUG(1,
2977 "Invalid '%s' field on disk %s (device %s), skipping.",
2978 "md_all", pp->name, sc->sc_name);
2979 return (EINVAL);
2980 }
2981 if ((md->md_mediasize % md->md_sectorsize) != 0) {
2982 G_RAID3_DEBUG(1, "Invalid metadata (mediasize %% sectorsize != "
2983 "0) on disk %s (device %s), skipping.", pp->name,
2984 sc->sc_name);
2985 return (EINVAL);
2986 }
2987 if (md->md_mediasize != sc->sc_mediasize) {
2988 G_RAID3_DEBUG(1,
2989 "Invalid '%s' field on disk %s (device %s), skipping.",
2990 "md_mediasize", pp->name, sc->sc_name);
2991 return (EINVAL);
2992 }
2993 if ((md->md_mediasize % (sc->sc_ndisks - 1)) != 0) {
2994 G_RAID3_DEBUG(1,
2995 "Invalid '%s' field on disk %s (device %s), skipping.",
2996 "md_mediasize", pp->name, sc->sc_name);
2997 return (EINVAL);
2998 }
2999 if ((sc->sc_mediasize / (sc->sc_ndisks - 1)) > pp->mediasize) {
3000 G_RAID3_DEBUG(1,
3001 "Invalid size of disk %s (device %s), skipping.", pp->name,
3002 sc->sc_name);
3003 return (EINVAL);
3004 }
3005 if ((md->md_sectorsize / pp->sectorsize) < sc->sc_ndisks - 1) {
3006 G_RAID3_DEBUG(1,
3007 "Invalid '%s' field on disk %s (device %s), skipping.",
3008 "md_sectorsize", pp->name, sc->sc_name);
3009 return (EINVAL);
3010 }
3011 if (md->md_sectorsize != sc->sc_sectorsize) {
3012 G_RAID3_DEBUG(1,
3013 "Invalid '%s' field on disk %s (device %s), skipping.",
3014 "md_sectorsize", pp->name, sc->sc_name);
3015 return (EINVAL);
3016 }
3017 if ((sc->sc_sectorsize % pp->sectorsize) != 0) {
3018 G_RAID3_DEBUG(1,
3019 "Invalid sector size of disk %s (device %s), skipping.",
3020 pp->name, sc->sc_name);
3021 return (EINVAL);
3022 }
3023 if ((md->md_mflags & ~G_RAID3_DEVICE_FLAG_MASK) != 0) {
3024 G_RAID3_DEBUG(1,
3025 "Invalid device flags on disk %s (device %s), skipping.",
3026 pp->name, sc->sc_name);
3027 return (EINVAL);
3028 }
3029 if ((md->md_mflags & G_RAID3_DEVICE_FLAG_VERIFY) != 0 &&
3030 (md->md_mflags & G_RAID3_DEVICE_FLAG_ROUND_ROBIN) != 0) {
3031 /*
3032 * VERIFY and ROUND-ROBIN options are mutally exclusive.
3033 */
3034 G_RAID3_DEBUG(1, "Both VERIFY and ROUND-ROBIN flags exist on "
3035 "disk %s (device %s), skipping.", pp->name, sc->sc_name);
3036 return (EINVAL);
3037 }
3038 if ((md->md_dflags & ~G_RAID3_DISK_FLAG_MASK) != 0) {
3039 G_RAID3_DEBUG(1,
3040 "Invalid disk flags on disk %s (device %s), skipping.",
3041 pp->name, sc->sc_name);
3042 return (EINVAL);
3043 }
3044 return (0);
3045 }
3046
3047 int
g_raid3_add_disk(struct g_raid3_softc * sc,struct g_provider * pp,struct g_raid3_metadata * md)3048 g_raid3_add_disk(struct g_raid3_softc *sc, struct g_provider *pp,
3049 struct g_raid3_metadata *md)
3050 {
3051 struct g_raid3_disk *disk;
3052 int error;
3053
3054 g_topology_assert_not();
3055 G_RAID3_DEBUG(2, "Adding disk %s.", pp->name);
3056
3057 error = g_raid3_check_metadata(sc, pp, md);
3058 if (error != 0)
3059 return (error);
3060 if (sc->sc_state != G_RAID3_DEVICE_STATE_STARTING &&
3061 md->md_genid < sc->sc_genid) {
3062 G_RAID3_DEBUG(0, "Component %s (device %s) broken, skipping.",
3063 pp->name, sc->sc_name);
3064 return (EINVAL);
3065 }
3066 disk = g_raid3_init_disk(sc, pp, md, &error);
3067 if (disk == NULL)
3068 return (error);
3069 error = g_raid3_event_send(disk, G_RAID3_DISK_STATE_NEW,
3070 G_RAID3_EVENT_WAIT);
3071 if (error != 0)
3072 return (error);
3073 if (md->md_version < G_RAID3_VERSION) {
3074 G_RAID3_DEBUG(0, "Upgrading metadata on %s (v%d->v%d).",
3075 pp->name, md->md_version, G_RAID3_VERSION);
3076 g_raid3_update_metadata(disk);
3077 }
3078 return (0);
3079 }
3080
3081 static void
g_raid3_destroy_delayed(void * arg,int flag)3082 g_raid3_destroy_delayed(void *arg, int flag)
3083 {
3084 struct g_raid3_softc *sc;
3085 int error;
3086
3087 if (flag == EV_CANCEL) {
3088 G_RAID3_DEBUG(1, "Destroying canceled.");
3089 return;
3090 }
3091 sc = arg;
3092 g_topology_unlock();
3093 sx_xlock(&sc->sc_lock);
3094 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) == 0,
3095 ("DESTROY flag set on %s.", sc->sc_name));
3096 KASSERT((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROYING) != 0,
3097 ("DESTROYING flag not set on %s.", sc->sc_name));
3098 G_RAID3_DEBUG(0, "Destroying %s (delayed).", sc->sc_name);
3099 error = g_raid3_destroy(sc, G_RAID3_DESTROY_SOFT);
3100 if (error != 0) {
3101 G_RAID3_DEBUG(0, "Cannot destroy %s.", sc->sc_name);
3102 sx_xunlock(&sc->sc_lock);
3103 }
3104 g_topology_lock();
3105 }
3106
3107 static int
g_raid3_access(struct g_provider * pp,int acr,int acw,int ace)3108 g_raid3_access(struct g_provider *pp, int acr, int acw, int ace)
3109 {
3110 struct g_raid3_softc *sc;
3111 int dcr, dcw, dce, error = 0;
3112
3113 g_topology_assert();
3114 G_RAID3_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name, acr,
3115 acw, ace);
3116
3117 sc = pp->private;
3118 KASSERT(sc != NULL, ("NULL softc (provider=%s).", pp->name));
3119
3120 dcr = pp->acr + acr;
3121 dcw = pp->acw + acw;
3122 dce = pp->ace + ace;
3123
3124 g_topology_unlock();
3125 sx_xlock(&sc->sc_lock);
3126 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROY) != 0 ||
3127 g_raid3_ndisks(sc, G_RAID3_DISK_STATE_ACTIVE) < sc->sc_ndisks - 1) {
3128 if (acr > 0 || acw > 0 || ace > 0)
3129 error = ENXIO;
3130 goto end;
3131 }
3132 if (dcw == 0)
3133 g_raid3_idle(sc, dcw);
3134 if ((sc->sc_flags & G_RAID3_DEVICE_FLAG_DESTROYING) != 0) {
3135 if (acr > 0 || acw > 0 || ace > 0) {
3136 error = ENXIO;
3137 goto end;
3138 }
3139 if (dcr == 0 && dcw == 0 && dce == 0) {
3140 g_post_event(g_raid3_destroy_delayed, sc, M_WAITOK,
3141 sc, NULL);
3142 }
3143 }
3144 end:
3145 sx_xunlock(&sc->sc_lock);
3146 g_topology_lock();
3147 return (error);
3148 }
3149
3150 static struct g_geom *
g_raid3_create(struct g_class * mp,const struct g_raid3_metadata * md)3151 g_raid3_create(struct g_class *mp, const struct g_raid3_metadata *md)
3152 {
3153 struct g_raid3_softc *sc;
3154 struct g_geom *gp;
3155 int error, timeout;
3156 u_int n;
3157
3158 g_topology_assert();
3159 G_RAID3_DEBUG(1, "Creating device %s (id=%u).", md->md_name, md->md_id);
3160
3161 /* One disk is minimum. */
3162 if (md->md_all < 1)
3163 return (NULL);
3164 /*
3165 * Action geom.
3166 */
3167 gp = g_new_geomf(mp, "%s", md->md_name);
3168 sc = malloc(sizeof(*sc), M_RAID3, M_WAITOK | M_ZERO);
3169 sc->sc_disks = malloc(sizeof(struct g_raid3_disk) * md->md_all, M_RAID3,
3170 M_WAITOK | M_ZERO);
3171 gp->start = g_raid3_start;
3172 gp->orphan = g_raid3_orphan;
3173 gp->access = g_raid3_access;
3174 gp->dumpconf = g_raid3_dumpconf;
3175
3176 sc->sc_id = md->md_id;
3177 sc->sc_mediasize = md->md_mediasize;
3178 sc->sc_sectorsize = md->md_sectorsize;
3179 sc->sc_ndisks = md->md_all;
3180 sc->sc_round_robin = 0;
3181 sc->sc_flags = md->md_mflags;
3182 sc->sc_bump_id = 0;
3183 sc->sc_idle = 1;
3184 sc->sc_last_write = time_uptime;
3185 sc->sc_writes = 0;
3186 sc->sc_refcnt = 1;
3187 for (n = 0; n < sc->sc_ndisks; n++) {
3188 sc->sc_disks[n].d_softc = sc;
3189 sc->sc_disks[n].d_no = n;
3190 sc->sc_disks[n].d_state = G_RAID3_DISK_STATE_NODISK;
3191 }
3192 sx_init(&sc->sc_lock, "graid3:lock");
3193 bioq_init(&sc->sc_queue);
3194 mtx_init(&sc->sc_queue_mtx, "graid3:queue", NULL, MTX_DEF);
3195 bioq_init(&sc->sc_regular_delayed);
3196 bioq_init(&sc->sc_inflight);
3197 bioq_init(&sc->sc_sync_delayed);
3198 TAILQ_INIT(&sc->sc_events);
3199 mtx_init(&sc->sc_events_mtx, "graid3:events", NULL, MTX_DEF);
3200 callout_init(&sc->sc_callout, 1);
3201 sc->sc_state = G_RAID3_DEVICE_STATE_STARTING;
3202 gp->softc = sc;
3203 sc->sc_geom = gp;
3204 sc->sc_provider = NULL;
3205 /*
3206 * Synchronization geom.
3207 */
3208 gp = g_new_geomf(mp, "%s.sync", md->md_name);
3209 gp->softc = sc;
3210 gp->orphan = g_raid3_orphan;
3211 sc->sc_sync.ds_geom = gp;
3212
3213 if (!g_raid3_use_malloc) {
3214 sc->sc_zones[G_RAID3_ZONE_64K].sz_zone = uma_zcreate("gr3:64k",
3215 65536, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3216 UMA_ALIGN_PTR, 0);
3217 sc->sc_zones[G_RAID3_ZONE_64K].sz_inuse = 0;
3218 sc->sc_zones[G_RAID3_ZONE_64K].sz_max = g_raid3_n64k;
3219 sc->sc_zones[G_RAID3_ZONE_64K].sz_requested =
3220 sc->sc_zones[G_RAID3_ZONE_64K].sz_failed = 0;
3221 sc->sc_zones[G_RAID3_ZONE_16K].sz_zone = uma_zcreate("gr3:16k",
3222 16384, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3223 UMA_ALIGN_PTR, 0);
3224 sc->sc_zones[G_RAID3_ZONE_16K].sz_inuse = 0;
3225 sc->sc_zones[G_RAID3_ZONE_16K].sz_max = g_raid3_n16k;
3226 sc->sc_zones[G_RAID3_ZONE_16K].sz_requested =
3227 sc->sc_zones[G_RAID3_ZONE_16K].sz_failed = 0;
3228 sc->sc_zones[G_RAID3_ZONE_4K].sz_zone = uma_zcreate("gr3:4k",
3229 4096, g_raid3_uma_ctor, g_raid3_uma_dtor, NULL, NULL,
3230 UMA_ALIGN_PTR, 0);
3231 sc->sc_zones[G_RAID3_ZONE_4K].sz_inuse = 0;
3232 sc->sc_zones[G_RAID3_ZONE_4K].sz_max = g_raid3_n4k;
3233 sc->sc_zones[G_RAID3_ZONE_4K].sz_requested =
3234 sc->sc_zones[G_RAID3_ZONE_4K].sz_failed = 0;
3235 }
3236
3237 error = kproc_create(g_raid3_worker, sc, &sc->sc_worker, 0, 0,
3238 "g_raid3 %s", md->md_name);
3239 if (error != 0) {
3240 G_RAID3_DEBUG(1, "Cannot create kernel thread for %s.",
3241 sc->sc_name);
3242 g_destroy_geom(sc->sc_geom);
3243 g_raid3_free_device(sc);
3244 return (NULL);
3245 }
3246
3247 G_RAID3_DEBUG(1, "Device %s created (%u components, id=%u).",
3248 sc->sc_name, sc->sc_ndisks, sc->sc_id);
3249
3250 sc->sc_rootmount = root_mount_hold("GRAID3");
3251 G_RAID3_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
3252
3253 /*
3254 * Schedule startup timeout.
3255 */
3256 timeout = atomic_load_acq_int(&g_raid3_timeout);
3257 sc->sc_timeout_event = malloc(sizeof(struct g_raid3_event), M_RAID3,
3258 M_WAITOK);
3259 callout_reset(&sc->sc_callout, timeout * hz, g_raid3_go, sc);
3260 return (sc->sc_geom);
3261 }
3262
3263 int
g_raid3_destroy(struct g_raid3_softc * sc,int how)3264 g_raid3_destroy(struct g_raid3_softc *sc, int how)
3265 {
3266 struct g_provider *pp;
3267
3268 g_topology_assert_not();
3269 sx_assert(&sc->sc_lock, SX_XLOCKED);
3270
3271 pp = sc->sc_provider;
3272 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
3273 switch (how) {
3274 case G_RAID3_DESTROY_SOFT:
3275 G_RAID3_DEBUG(1,
3276 "Device %s is still open (r%dw%de%d).", pp->name,
3277 pp->acr, pp->acw, pp->ace);
3278 return (EBUSY);
3279 case G_RAID3_DESTROY_DELAYED:
3280 G_RAID3_DEBUG(1,
3281 "Device %s will be destroyed on last close.",
3282 pp->name);
3283 if (sc->sc_syncdisk != NULL)
3284 g_raid3_sync_stop(sc, 1);
3285 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROYING;
3286 return (EBUSY);
3287 case G_RAID3_DESTROY_HARD:
3288 G_RAID3_DEBUG(1, "Device %s is still open, so it "
3289 "can't be definitely removed.", pp->name);
3290 break;
3291 }
3292 }
3293
3294 g_topology_lock();
3295 if (sc->sc_geom->softc == NULL) {
3296 g_topology_unlock();
3297 return (0);
3298 }
3299 sc->sc_geom->softc = NULL;
3300 sc->sc_sync.ds_geom->softc = NULL;
3301 g_topology_unlock();
3302
3303 sc->sc_flags |= G_RAID3_DEVICE_FLAG_DESTROY;
3304 sc->sc_flags |= G_RAID3_DEVICE_FLAG_WAIT;
3305 G_RAID3_DEBUG(4, "%s: Waking up %p.", __func__, sc);
3306 sx_xunlock(&sc->sc_lock);
3307 mtx_lock(&sc->sc_queue_mtx);
3308 wakeup(sc);
3309 wakeup(&sc->sc_queue);
3310 mtx_unlock(&sc->sc_queue_mtx);
3311 G_RAID3_DEBUG(4, "%s: Sleeping %p.", __func__, &sc->sc_worker);
3312 while (sc->sc_worker != NULL)
3313 tsleep(&sc->sc_worker, PRIBIO, "r3:destroy", hz / 5);
3314 G_RAID3_DEBUG(4, "%s: Woken up %p.", __func__, &sc->sc_worker);
3315 sx_xlock(&sc->sc_lock);
3316 g_raid3_destroy_device(sc);
3317 return (0);
3318 }
3319
3320 static void
g_raid3_taste_orphan(struct g_consumer * cp)3321 g_raid3_taste_orphan(struct g_consumer *cp)
3322 {
3323
3324 KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
3325 cp->provider->name));
3326 }
3327
3328 static struct g_geom *
g_raid3_taste(struct g_class * mp,struct g_provider * pp,int flags __unused)3329 g_raid3_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
3330 {
3331 struct g_raid3_metadata md;
3332 struct g_raid3_softc *sc;
3333 struct g_consumer *cp;
3334 struct g_geom *gp;
3335 int error;
3336
3337 g_topology_assert();
3338 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
3339 G_RAID3_DEBUG(2, "Tasting %s.", pp->name);
3340
3341 gp = g_new_geomf(mp, "raid3:taste");
3342 /* This orphan function should be never called. */
3343 gp->orphan = g_raid3_taste_orphan;
3344 cp = g_new_consumer(gp);
3345 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
3346 error = g_attach(cp, pp);
3347 if (error == 0) {
3348 error = g_raid3_read_metadata(cp, &md);
3349 g_detach(cp);
3350 }
3351 g_destroy_consumer(cp);
3352 g_destroy_geom(gp);
3353 if (error != 0)
3354 return (NULL);
3355 gp = NULL;
3356
3357 if (md.md_provider[0] != '\0' &&
3358 !g_compare_names(md.md_provider, pp->name))
3359 return (NULL);
3360 if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
3361 return (NULL);
3362 if (g_raid3_debug >= 2)
3363 raid3_metadata_dump(&md);
3364
3365 /*
3366 * Let's check if device already exists.
3367 */
3368 sc = NULL;
3369 LIST_FOREACH(gp, &mp->geom, geom) {
3370 sc = gp->softc;
3371 if (sc == NULL)
3372 continue;
3373 if (sc->sc_sync.ds_geom == gp)
3374 continue;
3375 if (strcmp(md.md_name, sc->sc_name) != 0)
3376 continue;
3377 if (md.md_id != sc->sc_id) {
3378 G_RAID3_DEBUG(0, "Device %s already configured.",
3379 sc->sc_name);
3380 return (NULL);
3381 }
3382 break;
3383 }
3384 if (gp == NULL) {
3385 gp = g_raid3_create(mp, &md);
3386 if (gp == NULL) {
3387 G_RAID3_DEBUG(0, "Cannot create device %s.",
3388 md.md_name);
3389 return (NULL);
3390 }
3391 sc = gp->softc;
3392 }
3393 G_RAID3_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
3394 g_topology_unlock();
3395 sx_xlock(&sc->sc_lock);
3396 error = g_raid3_add_disk(sc, pp, &md);
3397 if (error != 0) {
3398 G_RAID3_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
3399 pp->name, gp->name, error);
3400 if (g_raid3_ndisks(sc, G_RAID3_DISK_STATE_NODISK) ==
3401 sc->sc_ndisks) {
3402 g_cancel_event(sc);
3403 g_raid3_destroy(sc, G_RAID3_DESTROY_HARD);
3404 g_topology_lock();
3405 return (NULL);
3406 }
3407 gp = NULL;
3408 }
3409 sx_xunlock(&sc->sc_lock);
3410 g_topology_lock();
3411 return (gp);
3412 }
3413
3414 static int
g_raid3_destroy_geom(struct gctl_req * req __unused,struct g_class * mp __unused,struct g_geom * gp)3415 g_raid3_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
3416 struct g_geom *gp)
3417 {
3418 struct g_raid3_softc *sc;
3419 int error;
3420
3421 g_topology_unlock();
3422 sc = gp->softc;
3423 sx_xlock(&sc->sc_lock);
3424 g_cancel_event(sc);
3425 error = g_raid3_destroy(gp->softc, G_RAID3_DESTROY_SOFT);
3426 if (error != 0)
3427 sx_xunlock(&sc->sc_lock);
3428 g_topology_lock();
3429 return (error);
3430 }
3431
3432 static void
g_raid3_dumpconf(struct sbuf * sb,const char * indent,struct g_geom * gp,struct g_consumer * cp,struct g_provider * pp)3433 g_raid3_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
3434 struct g_consumer *cp, struct g_provider *pp)
3435 {
3436 struct g_raid3_softc *sc;
3437
3438 g_topology_assert();
3439
3440 sc = gp->softc;
3441 if (sc == NULL)
3442 return;
3443 /* Skip synchronization geom. */
3444 if (gp == sc->sc_sync.ds_geom)
3445 return;
3446 if (pp != NULL) {
3447 /* Nothing here. */
3448 } else if (cp != NULL) {
3449 struct g_raid3_disk *disk;
3450
3451 disk = cp->private;
3452 if (disk == NULL)
3453 return;
3454 g_topology_unlock();
3455 sx_xlock(&sc->sc_lock);
3456 sbuf_printf(sb, "%s<Type>", indent);
3457 if (disk->d_no == sc->sc_ndisks - 1)
3458 sbuf_cat(sb, "PARITY");
3459 else
3460 sbuf_cat(sb, "DATA");
3461 sbuf_cat(sb, "</Type>\n");
3462 sbuf_printf(sb, "%s<Number>%u</Number>\n", indent,
3463 (u_int)disk->d_no);
3464 if (disk->d_state == G_RAID3_DISK_STATE_SYNCHRONIZING) {
3465 sbuf_printf(sb, "%s<Synchronized>", indent);
3466 if (disk->d_sync.ds_offset == 0)
3467 sbuf_cat(sb, "0%");
3468 else {
3469 sbuf_printf(sb, "%u%%",
3470 (u_int)((disk->d_sync.ds_offset * 100) /
3471 (sc->sc_mediasize / (sc->sc_ndisks - 1))));
3472 }
3473 sbuf_cat(sb, "</Synchronized>\n");
3474 if (disk->d_sync.ds_offset > 0) {
3475 sbuf_printf(sb, "%s<BytesSynced>%jd"
3476 "</BytesSynced>\n", indent,
3477 (intmax_t)disk->d_sync.ds_offset);
3478 }
3479 }
3480 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent,
3481 disk->d_sync.ds_syncid);
3482 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, disk->d_genid);
3483 sbuf_printf(sb, "%s<Flags>", indent);
3484 if (disk->d_flags == 0)
3485 sbuf_cat(sb, "NONE");
3486 else {
3487 int first = 1;
3488
3489 #define ADD_FLAG(flag, name) do { \
3490 if ((disk->d_flags & (flag)) != 0) { \
3491 if (!first) \
3492 sbuf_cat(sb, ", "); \
3493 else \
3494 first = 0; \
3495 sbuf_cat(sb, name); \
3496 } \
3497 } while (0)
3498 ADD_FLAG(G_RAID3_DISK_FLAG_DIRTY, "DIRTY");
3499 ADD_FLAG(G_RAID3_DISK_FLAG_HARDCODED, "HARDCODED");
3500 ADD_FLAG(G_RAID3_DISK_FLAG_SYNCHRONIZING,
3501 "SYNCHRONIZING");
3502 ADD_FLAG(G_RAID3_DISK_FLAG_FORCE_SYNC, "FORCE_SYNC");
3503 ADD_FLAG(G_RAID3_DISK_FLAG_BROKEN, "BROKEN");
3504 #undef ADD_FLAG
3505 }
3506 sbuf_cat(sb, "</Flags>\n");
3507 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3508 g_raid3_disk_state2str(disk->d_state));
3509 sx_xunlock(&sc->sc_lock);
3510 g_topology_lock();
3511 } else {
3512 g_topology_unlock();
3513 sx_xlock(&sc->sc_lock);
3514 if (!g_raid3_use_malloc) {
3515 sbuf_printf(sb,
3516 "%s<Zone4kRequested>%u</Zone4kRequested>\n", indent,
3517 sc->sc_zones[G_RAID3_ZONE_4K].sz_requested);
3518 sbuf_printf(sb,
3519 "%s<Zone4kFailed>%u</Zone4kFailed>\n", indent,
3520 sc->sc_zones[G_RAID3_ZONE_4K].sz_failed);
3521 sbuf_printf(sb,
3522 "%s<Zone16kRequested>%u</Zone16kRequested>\n", indent,
3523 sc->sc_zones[G_RAID3_ZONE_16K].sz_requested);
3524 sbuf_printf(sb,
3525 "%s<Zone16kFailed>%u</Zone16kFailed>\n", indent,
3526 sc->sc_zones[G_RAID3_ZONE_16K].sz_failed);
3527 sbuf_printf(sb,
3528 "%s<Zone64kRequested>%u</Zone64kRequested>\n", indent,
3529 sc->sc_zones[G_RAID3_ZONE_64K].sz_requested);
3530 sbuf_printf(sb,
3531 "%s<Zone64kFailed>%u</Zone64kFailed>\n", indent,
3532 sc->sc_zones[G_RAID3_ZONE_64K].sz_failed);
3533 }
3534 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
3535 sbuf_printf(sb, "%s<SyncID>%u</SyncID>\n", indent, sc->sc_syncid);
3536 sbuf_printf(sb, "%s<GenID>%u</GenID>\n", indent, sc->sc_genid);
3537 sbuf_printf(sb, "%s<Flags>", indent);
3538 if (sc->sc_flags == 0)
3539 sbuf_cat(sb, "NONE");
3540 else {
3541 int first = 1;
3542
3543 #define ADD_FLAG(flag, name) do { \
3544 if ((sc->sc_flags & (flag)) != 0) { \
3545 if (!first) \
3546 sbuf_cat(sb, ", "); \
3547 else \
3548 first = 0; \
3549 sbuf_cat(sb, name); \
3550 } \
3551 } while (0)
3552 ADD_FLAG(G_RAID3_DEVICE_FLAG_NOFAILSYNC, "NOFAILSYNC");
3553 ADD_FLAG(G_RAID3_DEVICE_FLAG_NOAUTOSYNC, "NOAUTOSYNC");
3554 ADD_FLAG(G_RAID3_DEVICE_FLAG_ROUND_ROBIN,
3555 "ROUND-ROBIN");
3556 ADD_FLAG(G_RAID3_DEVICE_FLAG_VERIFY, "VERIFY");
3557 #undef ADD_FLAG
3558 }
3559 sbuf_cat(sb, "</Flags>\n");
3560 sbuf_printf(sb, "%s<Components>%u</Components>\n", indent,
3561 sc->sc_ndisks);
3562 sbuf_printf(sb, "%s<State>%s</State>\n", indent,
3563 g_raid3_device_state2str(sc->sc_state));
3564 sx_xunlock(&sc->sc_lock);
3565 g_topology_lock();
3566 }
3567 }
3568
3569 static void
g_raid3_shutdown_post_sync(void * arg,int howto)3570 g_raid3_shutdown_post_sync(void *arg, int howto)
3571 {
3572 struct g_class *mp;
3573 struct g_geom *gp, *gp2;
3574 struct g_raid3_softc *sc;
3575 int error;
3576
3577 if ((howto & RB_NOSYNC) != 0)
3578 return;
3579
3580 mp = arg;
3581 g_topology_lock();
3582 g_raid3_shutdown = 1;
3583 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
3584 if ((sc = gp->softc) == NULL)
3585 continue;
3586 /* Skip synchronization geom. */
3587 if (gp == sc->sc_sync.ds_geom)
3588 continue;
3589 g_topology_unlock();
3590 sx_xlock(&sc->sc_lock);
3591 g_raid3_idle(sc, -1);
3592 g_cancel_event(sc);
3593 error = g_raid3_destroy(sc, G_RAID3_DESTROY_DELAYED);
3594 if (error != 0)
3595 sx_xunlock(&sc->sc_lock);
3596 g_topology_lock();
3597 }
3598 g_topology_unlock();
3599 }
3600
3601 static void
g_raid3_init(struct g_class * mp)3602 g_raid3_init(struct g_class *mp)
3603 {
3604
3605 g_raid3_post_sync = EVENTHANDLER_REGISTER(shutdown_post_sync,
3606 g_raid3_shutdown_post_sync, mp, SHUTDOWN_PRI_FIRST);
3607 if (g_raid3_post_sync == NULL)
3608 G_RAID3_DEBUG(0, "Warning! Cannot register shutdown event.");
3609 }
3610
3611 static void
g_raid3_fini(struct g_class * mp)3612 g_raid3_fini(struct g_class *mp)
3613 {
3614
3615 if (g_raid3_post_sync != NULL)
3616 EVENTHANDLER_DEREGISTER(shutdown_post_sync, g_raid3_post_sync);
3617 }
3618
3619 DECLARE_GEOM_CLASS(g_raid3_class, g_raid3);
3620 MODULE_VERSION(geom_raid3, 0);
3621