FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_io.c
1 /*-
2 * Copyright (c) 2002 Poul-Henning Kamp
3 * Copyright (c) 2002 Networks Associates Technology, Inc.
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
7 * and NAI Labs, the Security Research Division of Network Associates, Inc.
8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
9 * DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The names of the authors may not be used to endorse or promote
20 * products derived from this software without specific prior written
21 * permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: releng/8.3/sys/geom/geom_io.c 212939 2010-09-20 23:39:00Z gibbs $");
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/bio.h>
44 #include <sys/ktr.h>
45 #include <sys/proc.h>
46 #include <sys/stack.h>
47
48 #include <sys/errno.h>
49 #include <geom/geom.h>
50 #include <geom/geom_int.h>
51 #include <sys/devicestat.h>
52
53 #include <vm/uma.h>
54
55 static struct g_bioq g_bio_run_down;
56 static struct g_bioq g_bio_run_up;
57 static struct g_bioq g_bio_run_task;
58
59 static u_int pace;
60 static uma_zone_t biozone;
61
62 /*
63 * The head of the list of classifiers used in g_io_request.
64 * Use g_register_classifier() and g_unregister_classifier()
65 * to add/remove entries to the list.
66 * Classifiers are invoked in registration order.
67 */
68 static TAILQ_HEAD(g_classifier_tailq, g_classifier_hook)
69 g_classifier_tailq = TAILQ_HEAD_INITIALIZER(g_classifier_tailq);
70
71 #include <machine/atomic.h>
72
73 static void
74 g_bioq_lock(struct g_bioq *bq)
75 {
76
77 mtx_lock(&bq->bio_queue_lock);
78 }
79
80 static void
81 g_bioq_unlock(struct g_bioq *bq)
82 {
83
84 mtx_unlock(&bq->bio_queue_lock);
85 }
86
87 #if 0
88 static void
89 g_bioq_destroy(struct g_bioq *bq)
90 {
91
92 mtx_destroy(&bq->bio_queue_lock);
93 }
94 #endif
95
96 static void
97 g_bioq_init(struct g_bioq *bq)
98 {
99
100 TAILQ_INIT(&bq->bio_queue);
101 mtx_init(&bq->bio_queue_lock, "bio queue", NULL, MTX_DEF);
102 }
103
104 static struct bio *
105 g_bioq_first(struct g_bioq *bq)
106 {
107 struct bio *bp;
108
109 bp = TAILQ_FIRST(&bq->bio_queue);
110 if (bp != NULL) {
111 KASSERT((bp->bio_flags & BIO_ONQUEUE),
112 ("Bio not on queue bp=%p target %p", bp, bq));
113 bp->bio_flags &= ~BIO_ONQUEUE;
114 TAILQ_REMOVE(&bq->bio_queue, bp, bio_queue);
115 bq->bio_queue_length--;
116 }
117 return (bp);
118 }
119
120 struct bio *
121 g_new_bio(void)
122 {
123 struct bio *bp;
124
125 bp = uma_zalloc(biozone, M_NOWAIT | M_ZERO);
126 #ifdef KTR
127 if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
128 struct stack st;
129
130 CTR1(KTR_GEOM, "g_new_bio(): %p", bp);
131 stack_save(&st);
132 CTRSTACK(KTR_GEOM, &st, 3, 0);
133 }
134 #endif
135 return (bp);
136 }
137
138 struct bio *
139 g_alloc_bio(void)
140 {
141 struct bio *bp;
142
143 bp = uma_zalloc(biozone, M_WAITOK | M_ZERO);
144 #ifdef KTR
145 if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
146 struct stack st;
147
148 CTR1(KTR_GEOM, "g_alloc_bio(): %p", bp);
149 stack_save(&st);
150 CTRSTACK(KTR_GEOM, &st, 3, 0);
151 }
152 #endif
153 return (bp);
154 }
155
156 void
157 g_destroy_bio(struct bio *bp)
158 {
159 #ifdef KTR
160 if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
161 struct stack st;
162
163 CTR1(KTR_GEOM, "g_destroy_bio(): %p", bp);
164 stack_save(&st);
165 CTRSTACK(KTR_GEOM, &st, 3, 0);
166 }
167 #endif
168 uma_zfree(biozone, bp);
169 }
170
171 struct bio *
172 g_clone_bio(struct bio *bp)
173 {
174 struct bio *bp2;
175
176 bp2 = uma_zalloc(biozone, M_NOWAIT | M_ZERO);
177 if (bp2 != NULL) {
178 bp2->bio_parent = bp;
179 bp2->bio_cmd = bp->bio_cmd;
180 bp2->bio_length = bp->bio_length;
181 bp2->bio_offset = bp->bio_offset;
182 bp2->bio_data = bp->bio_data;
183 bp2->bio_attribute = bp->bio_attribute;
184 /* Inherit classification info from the parent */
185 bp2->bio_classifier1 = bp->bio_classifier1;
186 bp2->bio_classifier2 = bp->bio_classifier2;
187 bp->bio_children++;
188 }
189 #ifdef KTR
190 if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
191 struct stack st;
192
193 CTR2(KTR_GEOM, "g_clone_bio(%p): %p", bp, bp2);
194 stack_save(&st);
195 CTRSTACK(KTR_GEOM, &st, 3, 0);
196 }
197 #endif
198 return(bp2);
199 }
200
201 struct bio *
202 g_duplicate_bio(struct bio *bp)
203 {
204 struct bio *bp2;
205
206 bp2 = uma_zalloc(biozone, M_WAITOK | M_ZERO);
207 bp2->bio_parent = bp;
208 bp2->bio_cmd = bp->bio_cmd;
209 bp2->bio_length = bp->bio_length;
210 bp2->bio_offset = bp->bio_offset;
211 bp2->bio_data = bp->bio_data;
212 bp2->bio_attribute = bp->bio_attribute;
213 bp->bio_children++;
214 #ifdef KTR
215 if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
216 struct stack st;
217
218 CTR2(KTR_GEOM, "g_duplicate_bio(%p): %p", bp, bp2);
219 stack_save(&st);
220 CTRSTACK(KTR_GEOM, &st, 3, 0);
221 }
222 #endif
223 return(bp2);
224 }
225
226 void
227 g_io_init()
228 {
229
230 g_bioq_init(&g_bio_run_down);
231 g_bioq_init(&g_bio_run_up);
232 g_bioq_init(&g_bio_run_task);
233 biozone = uma_zcreate("g_bio", sizeof (struct bio),
234 NULL, NULL,
235 NULL, NULL,
236 0, 0);
237 }
238
239 int
240 g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr)
241 {
242 struct bio *bp;
243 int error;
244
245 g_trace(G_T_BIO, "bio_getattr(%s)", attr);
246 bp = g_alloc_bio();
247 bp->bio_cmd = BIO_GETATTR;
248 bp->bio_done = NULL;
249 bp->bio_attribute = attr;
250 bp->bio_length = *len;
251 bp->bio_data = ptr;
252 g_io_request(bp, cp);
253 error = biowait(bp, "ggetattr");
254 *len = bp->bio_completed;
255 g_destroy_bio(bp);
256 return (error);
257 }
258
259 int
260 g_io_flush(struct g_consumer *cp)
261 {
262 struct bio *bp;
263 int error;
264
265 g_trace(G_T_BIO, "bio_flush(%s)", cp->provider->name);
266 bp = g_alloc_bio();
267 bp->bio_cmd = BIO_FLUSH;
268 bp->bio_flags |= BIO_ORDERED;
269 bp->bio_done = NULL;
270 bp->bio_attribute = NULL;
271 bp->bio_offset = cp->provider->mediasize;
272 bp->bio_length = 0;
273 bp->bio_data = NULL;
274 g_io_request(bp, cp);
275 error = biowait(bp, "gflush");
276 g_destroy_bio(bp);
277 return (error);
278 }
279
280 static int
281 g_io_check(struct bio *bp)
282 {
283 struct g_consumer *cp;
284 struct g_provider *pp;
285
286 cp = bp->bio_from;
287 pp = bp->bio_to;
288
289 /* Fail if access counters dont allow the operation */
290 switch(bp->bio_cmd) {
291 case BIO_READ:
292 case BIO_GETATTR:
293 if (cp->acr == 0)
294 return (EPERM);
295 break;
296 case BIO_WRITE:
297 case BIO_DELETE:
298 case BIO_FLUSH:
299 if (cp->acw == 0)
300 return (EPERM);
301 break;
302 default:
303 return (EPERM);
304 }
305 /* if provider is marked for error, don't disturb. */
306 if (pp->error)
307 return (pp->error);
308
309 switch(bp->bio_cmd) {
310 case BIO_READ:
311 case BIO_WRITE:
312 case BIO_DELETE:
313 /* Zero sectorsize or mediasize is probably a lack of media. */
314 if (pp->sectorsize == 0 || pp->mediasize == 0)
315 return (ENXIO);
316 /* Reject I/O not on sector boundary */
317 if (bp->bio_offset % pp->sectorsize)
318 return (EINVAL);
319 /* Reject I/O not integral sector long */
320 if (bp->bio_length % pp->sectorsize)
321 return (EINVAL);
322 /* Reject requests before or past the end of media. */
323 if (bp->bio_offset < 0)
324 return (EIO);
325 if (bp->bio_offset > pp->mediasize)
326 return (EIO);
327 break;
328 default:
329 break;
330 }
331 return (0);
332 }
333
334 /*
335 * bio classification support.
336 *
337 * g_register_classifier() and g_unregister_classifier()
338 * are used to add/remove a classifier from the list.
339 * The list is protected using the g_bio_run_down lock,
340 * because the classifiers are called in this path.
341 *
342 * g_io_request() passes bio's that are not already classified
343 * (i.e. those with bio_classifier1 == NULL) to g_run_classifiers().
344 * Classifiers can store their result in the two fields
345 * bio_classifier1 and bio_classifier2.
346 * A classifier that updates one of the fields should
347 * return a non-zero value.
348 * If no classifier updates the field, g_run_classifiers() sets
349 * bio_classifier1 = BIO_NOTCLASSIFIED to avoid further calls.
350 */
351
352 int
353 g_register_classifier(struct g_classifier_hook *hook)
354 {
355
356 g_bioq_lock(&g_bio_run_down);
357 TAILQ_INSERT_TAIL(&g_classifier_tailq, hook, link);
358 g_bioq_unlock(&g_bio_run_down);
359
360 return (0);
361 }
362
363 void
364 g_unregister_classifier(struct g_classifier_hook *hook)
365 {
366 struct g_classifier_hook *entry;
367
368 g_bioq_lock(&g_bio_run_down);
369 TAILQ_FOREACH(entry, &g_classifier_tailq, link) {
370 if (entry == hook) {
371 TAILQ_REMOVE(&g_classifier_tailq, hook, link);
372 break;
373 }
374 }
375 g_bioq_unlock(&g_bio_run_down);
376 }
377
378 static void
379 g_run_classifiers(struct bio *bp)
380 {
381 struct g_classifier_hook *hook;
382 int classified = 0;
383
384 TAILQ_FOREACH(hook, &g_classifier_tailq, link)
385 classified |= hook->func(hook->arg, bp);
386
387 if (!classified)
388 bp->bio_classifier1 = BIO_NOTCLASSIFIED;
389 }
390
391 void
392 g_io_request(struct bio *bp, struct g_consumer *cp)
393 {
394 struct g_provider *pp;
395 int first;
396
397 KASSERT(cp != NULL, ("NULL cp in g_io_request"));
398 KASSERT(bp != NULL, ("NULL bp in g_io_request"));
399 pp = cp->provider;
400 KASSERT(pp != NULL, ("consumer not attached in g_io_request"));
401 #ifdef DIAGNOSTIC
402 KASSERT(bp->bio_driver1 == NULL,
403 ("bio_driver1 used by the consumer (geom %s)", cp->geom->name));
404 KASSERT(bp->bio_driver2 == NULL,
405 ("bio_driver2 used by the consumer (geom %s)", cp->geom->name));
406 KASSERT(bp->bio_pflags == 0,
407 ("bio_pflags used by the consumer (geom %s)", cp->geom->name));
408 /*
409 * Remember consumer's private fields, so we can detect if they were
410 * modified by the provider.
411 */
412 bp->_bio_caller1 = bp->bio_caller1;
413 bp->_bio_caller2 = bp->bio_caller2;
414 bp->_bio_cflags = bp->bio_cflags;
415 #endif
416
417 if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_GETATTR)) {
418 KASSERT(bp->bio_data != NULL,
419 ("NULL bp->data in g_io_request(cmd=%hhu)", bp->bio_cmd));
420 }
421 if (bp->bio_cmd & (BIO_DELETE|BIO_FLUSH)) {
422 KASSERT(bp->bio_data == NULL,
423 ("non-NULL bp->data in g_io_request(cmd=%hhu)",
424 bp->bio_cmd));
425 }
426 if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) {
427 KASSERT(bp->bio_offset % cp->provider->sectorsize == 0,
428 ("wrong offset %jd for sectorsize %u",
429 bp->bio_offset, cp->provider->sectorsize));
430 KASSERT(bp->bio_length % cp->provider->sectorsize == 0,
431 ("wrong length %jd for sectorsize %u",
432 bp->bio_length, cp->provider->sectorsize));
433 }
434
435 g_trace(G_T_BIO, "bio_request(%p) from %p(%s) to %p(%s) cmd %d",
436 bp, cp, cp->geom->name, pp, pp->name, bp->bio_cmd);
437
438 bp->bio_from = cp;
439 bp->bio_to = pp;
440 bp->bio_error = 0;
441 bp->bio_completed = 0;
442
443 KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
444 ("Bio already on queue bp=%p", bp));
445 bp->bio_flags |= BIO_ONQUEUE;
446
447 binuptime(&bp->bio_t0);
448
449 /*
450 * The statistics collection is lockless, as such, but we
451 * can not update one instance of the statistics from more
452 * than one thread at a time, so grab the lock first.
453 *
454 * We also use the lock to protect the list of classifiers.
455 */
456 g_bioq_lock(&g_bio_run_down);
457
458 if (!TAILQ_EMPTY(&g_classifier_tailq) && !bp->bio_classifier1)
459 g_run_classifiers(bp);
460
461 if (g_collectstats & 1)
462 devstat_start_transaction(pp->stat, &bp->bio_t0);
463 if (g_collectstats & 2)
464 devstat_start_transaction(cp->stat, &bp->bio_t0);
465
466 pp->nstart++;
467 cp->nstart++;
468 first = TAILQ_EMPTY(&g_bio_run_down.bio_queue);
469 TAILQ_INSERT_TAIL(&g_bio_run_down.bio_queue, bp, bio_queue);
470 g_bio_run_down.bio_queue_length++;
471 g_bioq_unlock(&g_bio_run_down);
472
473 /* Pass it on down. */
474 if (first)
475 wakeup(&g_wait_down);
476 }
477
478 void
479 g_io_deliver(struct bio *bp, int error)
480 {
481 struct g_consumer *cp;
482 struct g_provider *pp;
483 int first;
484
485 KASSERT(bp != NULL, ("NULL bp in g_io_deliver"));
486 pp = bp->bio_to;
487 KASSERT(pp != NULL, ("NULL bio_to in g_io_deliver"));
488 cp = bp->bio_from;
489 if (cp == NULL) {
490 bp->bio_error = error;
491 bp->bio_done(bp);
492 return;
493 }
494 KASSERT(cp != NULL, ("NULL bio_from in g_io_deliver"));
495 KASSERT(cp->geom != NULL, ("NULL bio_from->geom in g_io_deliver"));
496 #ifdef DIAGNOSTIC
497 /*
498 * Some classes - GJournal in particular - can modify bio's
499 * private fields while the bio is in transit; G_GEOM_VOLATILE_BIO
500 * flag means it's an expected behaviour for that particular geom.
501 */
502 if ((cp->geom->flags & G_GEOM_VOLATILE_BIO) == 0) {
503 KASSERT(bp->bio_caller1 == bp->_bio_caller1,
504 ("bio_caller1 used by the provider %s", pp->name));
505 KASSERT(bp->bio_caller2 == bp->_bio_caller2,
506 ("bio_caller2 used by the provider %s", pp->name));
507 KASSERT(bp->bio_cflags == bp->_bio_cflags,
508 ("bio_cflags used by the provider %s", pp->name));
509 }
510 #endif
511 KASSERT(bp->bio_completed >= 0, ("bio_completed can't be less than 0"));
512 KASSERT(bp->bio_completed <= bp->bio_length,
513 ("bio_completed can't be greater than bio_length"));
514
515 g_trace(G_T_BIO,
516 "g_io_deliver(%p) from %p(%s) to %p(%s) cmd %d error %d off %jd len %jd",
517 bp, cp, cp->geom->name, pp, pp->name, bp->bio_cmd, error,
518 (intmax_t)bp->bio_offset, (intmax_t)bp->bio_length);
519
520 KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
521 ("Bio already on queue bp=%p", bp));
522
523 /*
524 * XXX: next two doesn't belong here
525 */
526 bp->bio_bcount = bp->bio_length;
527 bp->bio_resid = bp->bio_bcount - bp->bio_completed;
528
529 /*
530 * The statistics collection is lockless, as such, but we
531 * can not update one instance of the statistics from more
532 * than one thread at a time, so grab the lock first.
533 */
534 g_bioq_lock(&g_bio_run_up);
535 if (g_collectstats & 1)
536 devstat_end_transaction_bio(pp->stat, bp);
537 if (g_collectstats & 2)
538 devstat_end_transaction_bio(cp->stat, bp);
539
540 cp->nend++;
541 pp->nend++;
542 if (error != ENOMEM) {
543 bp->bio_error = error;
544 first = TAILQ_EMPTY(&g_bio_run_up.bio_queue);
545 TAILQ_INSERT_TAIL(&g_bio_run_up.bio_queue, bp, bio_queue);
546 bp->bio_flags |= BIO_ONQUEUE;
547 g_bio_run_up.bio_queue_length++;
548 g_bioq_unlock(&g_bio_run_up);
549 if (first)
550 wakeup(&g_wait_up);
551 return;
552 }
553 g_bioq_unlock(&g_bio_run_up);
554
555 if (bootverbose)
556 printf("ENOMEM %p on %p(%s)\n", bp, pp, pp->name);
557 bp->bio_children = 0;
558 bp->bio_inbed = 0;
559 g_io_request(bp, cp);
560 pace++;
561 return;
562 }
563
564 void
565 g_io_schedule_down(struct thread *tp __unused)
566 {
567 struct bio *bp;
568 off_t excess;
569 int error;
570
571 for(;;) {
572 g_bioq_lock(&g_bio_run_down);
573 bp = g_bioq_first(&g_bio_run_down);
574 if (bp == NULL) {
575 CTR0(KTR_GEOM, "g_down going to sleep");
576 msleep(&g_wait_down, &g_bio_run_down.bio_queue_lock,
577 PRIBIO | PDROP, "-", 0);
578 continue;
579 }
580 CTR0(KTR_GEOM, "g_down has work to do");
581 g_bioq_unlock(&g_bio_run_down);
582 if (pace > 0) {
583 CTR1(KTR_GEOM, "g_down pacing self (pace %d)", pace);
584 pause("g_down", hz/10);
585 pace--;
586 }
587 error = g_io_check(bp);
588 if (error) {
589 CTR3(KTR_GEOM, "g_down g_io_check on bp %p provider "
590 "%s returned %d", bp, bp->bio_to->name, error);
591 g_io_deliver(bp, error);
592 continue;
593 }
594 CTR2(KTR_GEOM, "g_down processing bp %p provider %s", bp,
595 bp->bio_to->name);
596 switch (bp->bio_cmd) {
597 case BIO_READ:
598 case BIO_WRITE:
599 case BIO_DELETE:
600 /* Truncate requests to the end of providers media. */
601 /*
602 * XXX: What if we truncate because of offset being
603 * bad, not length?
604 */
605 excess = bp->bio_offset + bp->bio_length;
606 if (excess > bp->bio_to->mediasize) {
607 excess -= bp->bio_to->mediasize;
608 bp->bio_length -= excess;
609 if (excess > 0)
610 CTR3(KTR_GEOM, "g_down truncated bio "
611 "%p provider %s by %d", bp,
612 bp->bio_to->name, excess);
613 }
614 /* Deliver zero length transfers right here. */
615 if (bp->bio_length == 0) {
616 g_io_deliver(bp, 0);
617 CTR2(KTR_GEOM, "g_down terminated 0-length "
618 "bp %p provider %s", bp, bp->bio_to->name);
619 continue;
620 }
621 break;
622 default:
623 break;
624 }
625 THREAD_NO_SLEEPING();
626 CTR4(KTR_GEOM, "g_down starting bp %p provider %s off %ld "
627 "len %ld", bp, bp->bio_to->name, bp->bio_offset,
628 bp->bio_length);
629 bp->bio_to->geom->start(bp);
630 THREAD_SLEEPING_OK();
631 }
632 }
633
634 void
635 bio_taskqueue(struct bio *bp, bio_task_t *func, void *arg)
636 {
637 bp->bio_task = func;
638 bp->bio_task_arg = arg;
639 /*
640 * The taskqueue is actually just a second queue off the "up"
641 * queue, so we use the same lock.
642 */
643 g_bioq_lock(&g_bio_run_up);
644 KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
645 ("Bio already on queue bp=%p target taskq", bp));
646 bp->bio_flags |= BIO_ONQUEUE;
647 TAILQ_INSERT_TAIL(&g_bio_run_task.bio_queue, bp, bio_queue);
648 g_bio_run_task.bio_queue_length++;
649 wakeup(&g_wait_up);
650 g_bioq_unlock(&g_bio_run_up);
651 }
652
653
654 void
655 g_io_schedule_up(struct thread *tp __unused)
656 {
657 struct bio *bp;
658 for(;;) {
659 g_bioq_lock(&g_bio_run_up);
660 bp = g_bioq_first(&g_bio_run_task);
661 if (bp != NULL) {
662 g_bioq_unlock(&g_bio_run_up);
663 THREAD_NO_SLEEPING();
664 CTR1(KTR_GEOM, "g_up processing task bp %p", bp);
665 bp->bio_task(bp->bio_task_arg);
666 THREAD_SLEEPING_OK();
667 continue;
668 }
669 bp = g_bioq_first(&g_bio_run_up);
670 if (bp != NULL) {
671 g_bioq_unlock(&g_bio_run_up);
672 THREAD_NO_SLEEPING();
673 CTR4(KTR_GEOM, "g_up biodone bp %p provider %s off "
674 "%jd len %ld", bp, bp->bio_to->name,
675 bp->bio_offset, bp->bio_length);
676 biodone(bp);
677 THREAD_SLEEPING_OK();
678 continue;
679 }
680 CTR0(KTR_GEOM, "g_up going to sleep");
681 msleep(&g_wait_up, &g_bio_run_up.bio_queue_lock,
682 PRIBIO | PDROP, "-", 0);
683 }
684 }
685
686 void *
687 g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error)
688 {
689 struct bio *bp;
690 void *ptr;
691 int errorc;
692
693 KASSERT(length > 0 && length >= cp->provider->sectorsize &&
694 length <= MAXPHYS, ("g_read_data(): invalid length %jd",
695 (intmax_t)length));
696
697 bp = g_alloc_bio();
698 bp->bio_cmd = BIO_READ;
699 bp->bio_done = NULL;
700 bp->bio_offset = offset;
701 bp->bio_length = length;
702 ptr = g_malloc(length, M_WAITOK);
703 bp->bio_data = ptr;
704 g_io_request(bp, cp);
705 errorc = biowait(bp, "gread");
706 if (error != NULL)
707 *error = errorc;
708 g_destroy_bio(bp);
709 if (errorc) {
710 g_free(ptr);
711 ptr = NULL;
712 }
713 return (ptr);
714 }
715
716 int
717 g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length)
718 {
719 struct bio *bp;
720 int error;
721
722 KASSERT(length > 0 && length >= cp->provider->sectorsize &&
723 length <= MAXPHYS, ("g_write_data(): invalid length %jd",
724 (intmax_t)length));
725
726 bp = g_alloc_bio();
727 bp->bio_cmd = BIO_WRITE;
728 bp->bio_done = NULL;
729 bp->bio_offset = offset;
730 bp->bio_length = length;
731 bp->bio_data = ptr;
732 g_io_request(bp, cp);
733 error = biowait(bp, "gwrite");
734 g_destroy_bio(bp);
735 return (error);
736 }
737
738 int
739 g_delete_data(struct g_consumer *cp, off_t offset, off_t length)
740 {
741 struct bio *bp;
742 int error;
743
744 KASSERT(length > 0 && length >= cp->provider->sectorsize,
745 ("g_delete_data(): invalid length %jd", (intmax_t)length));
746
747 bp = g_alloc_bio();
748 bp->bio_cmd = BIO_DELETE;
749 bp->bio_done = NULL;
750 bp->bio_offset = offset;
751 bp->bio_length = length;
752 bp->bio_data = NULL;
753 g_io_request(bp, cp);
754 error = biowait(bp, "gdelete");
755 g_destroy_bio(bp);
756 return (error);
757 }
758
759 void
760 g_print_bio(struct bio *bp)
761 {
762 const char *pname, *cmd = NULL;
763
764 if (bp->bio_to != NULL)
765 pname = bp->bio_to->name;
766 else
767 pname = "[unknown]";
768
769 switch (bp->bio_cmd) {
770 case BIO_GETATTR:
771 cmd = "GETATTR";
772 printf("%s[%s(attr=%s)]", pname, cmd, bp->bio_attribute);
773 return;
774 case BIO_FLUSH:
775 cmd = "FLUSH";
776 printf("%s[%s]", pname, cmd);
777 return;
778 case BIO_READ:
779 cmd = "READ";
780 case BIO_WRITE:
781 if (cmd == NULL)
782 cmd = "WRITE";
783 case BIO_DELETE:
784 if (cmd == NULL)
785 cmd = "DELETE";
786 printf("%s[%s(offset=%jd, length=%jd)]", pname, cmd,
787 (intmax_t)bp->bio_offset, (intmax_t)bp->bio_length);
788 return;
789 default:
790 cmd = "UNKNOWN";
791 printf("%s[%s()]", pname, cmd);
792 return;
793 }
794 /* NOTREACHED */
795 }
Cache object: faa44b8f5ea2796190a038f53057ef5e
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