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kernel/vm: Rename *_putpages()'s 'sync' argument to 'flags'.
[dragonfly.git] / sys / kern / subr_disk.c
blob6ee205a24667a7cbb817872c313d4f0ce2e90bd2
1 /*
2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 * and Alex Hornung <ahornung@gmail.com>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * ----------------------------------------------------------------------------
36 * "THE BEER-WARE LICENSE" (Revision 42):
37 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
38 * can do whatever you want with this stuff. If we meet some day, and you think
39 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
40 * ----------------------------------------------------------------------------
41 *
42 * Copyright (c) 1982, 1986, 1988, 1993
43 * The Regents of the University of California. All rights reserved.
44 * (c) UNIX System Laboratories, Inc.
45 * All or some portions of this file are derived from material licensed
46 * to the University of California by American Telephone and Telegraph
47 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
48 * the permission of UNIX System Laboratories, Inc.
49 *
50 * Redistribution and use in source and binary forms, with or without
51 * modification, are permitted provided that the following conditions
52 * are met:
53 * 1. Redistributions of source code must retain the above copyright
54 * notice, this list of conditions and the following disclaimer.
55 * 2. Redistributions in binary form must reproduce the above copyright
56 * notice, this list of conditions and the following disclaimer in the
57 * documentation and/or other materials provided with the distribution.
58 * 3. Neither the name of the University nor the names of its contributors
59 * may be used to endorse or promote products derived from this software
60 * without specific prior written permission.
61 *
62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
72 * SUCH DAMAGE.
73 *
74 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
75 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
76 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
77 */
78
79 #include <sys/param.h>
80 #include <sys/systm.h>
81 #include <sys/kernel.h>
82 #include <sys/proc.h>
83 #include <sys/sysctl.h>
84 #include <sys/buf.h>
85 #include <sys/conf.h>
86 #include <sys/disklabel.h>
87 #include <sys/disklabel32.h>
88 #include <sys/disklabel64.h>
89 #include <sys/diskslice.h>
90 #include <sys/diskmbr.h>
91 #include <sys/disk.h>
92 #include <sys/kerneldump.h>
93 #include <sys/malloc.h>
94 #include <machine/md_var.h>
95 #include <sys/ctype.h>
96 #include <sys/syslog.h>
97 #include <sys/device.h>
98 #include <sys/msgport.h>
99 #include <sys/devfs.h>
100 #include <sys/thread.h>
101 #include <sys/dsched.h>
102 #include <sys/queue.h>
103 #include <sys/lock.h>
104 #include <sys/udev.h>
105 #include <sys/uuid.h>
106
107 #include <sys/buf2.h>
108 #include <sys/msgport2.h>
109
110 static MALLOC_DEFINE(M_DISK, "disk", "disk data");
111 static int disk_debug_enable = 0;
112
113 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
114 static void disk_msg_core(void *);
115 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe);
116 static void disk_probe(struct disk *dp, int reprobe);
117 static void _setdiskinfo(struct disk *disk, struct disk_info *info);
118 static void bioqwritereorder(struct bio_queue_head *bioq);
119 static void disk_cleanserial(char *serno);
120 static int disk_debug(int, char *, ...) __printflike(2, 3);
121 static cdev_t _disk_create_named(const char *name, int unit, struct disk *dp,
122 struct dev_ops *raw_ops, int clone);
123
124 static d_open_t diskopen;
125 static d_close_t diskclose;
126 static d_ioctl_t diskioctl;
127 static d_strategy_t diskstrategy;
128 static d_psize_t diskpsize;
129 static d_dump_t diskdump;
130
131 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
132 static struct lwkt_token disklist_token;
133 static struct lwkt_token ds_token;
134
135 static struct dev_ops disk1_ops = {
136 { "disk", 0, D_DISK | D_MPSAFE | D_TRACKCLOSE | D_KVABIO },
137 .d_open = diskopen,
138 .d_close = diskclose,
139 .d_read = physread,
140 .d_write = physwrite,
141 .d_ioctl = diskioctl,
142 .d_strategy = diskstrategy,
143 .d_dump = diskdump,
144 .d_psize = diskpsize,
145 };
146
147 static struct dev_ops disk2_ops = {
148 { "disk", 0, D_DISK | D_MPSAFE | D_TRACKCLOSE | D_KVABIO |
149 D_NOEMERGPGR },
150 .d_open = diskopen,
151 .d_close = diskclose,
152 .d_read = physread,
153 .d_write = physwrite,
154 .d_ioctl = diskioctl,
155 .d_strategy = diskstrategy,
156 .d_dump = diskdump,
157 .d_psize = diskpsize,
158 };
159
160 static struct objcache *disk_msg_cache;
161
162 struct objcache_malloc_args disk_msg_malloc_args = {
163 sizeof(struct disk_msg), M_DISK };
164
165 static struct lwkt_port disk_dispose_port;
166 static struct lwkt_port disk_msg_port;
167
168 static int
169 disk_debug(int level, char *fmt, ...)
170 {
171 __va_list ap;
172
173 __va_start(ap, fmt);
174 if (level <= disk_debug_enable)
175 kvprintf(fmt, ap);
176 __va_end(ap);
177
178 return 0;
179 }
180
181 static int
182 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
183 {
184 struct disk_info *info = &dp->d_info;
185 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
186 disklabel_ops_t ops;
187 struct dev_ops *dops;
188 struct partinfo part;
189 const char *msg;
190 char uuid_buf[128];
191 cdev_t ndev;
192 int sno;
193 u_int i;
194
195 disk_debug(2, "disk_probe_slice (begin): %s (%s)\n",
196 dev->si_name, dp->d_cdev->si_name);
197
198 sno = slice ? slice - 1 : 0;
199 dops = (dp->d_rawdev->si_ops->head.flags & D_NOEMERGPGR) ?
200 &disk2_ops : &disk1_ops;
201
202 ops = &disklabel32_ops;
203 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
204 if (msg && !strcmp(msg, "no disk label")) {
205 ops = &disklabel64_ops;
206 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
207 }
208
209 if (msg == NULL) {
210 char packname[DISKLABEL_MAXPACKNAME];
211
212 if (slice != WHOLE_DISK_SLICE)
213 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
214 else
215 sp->ds_reserved = 0;
216
217 ops->op_getpackname(sp->ds_label, packname, sizeof(packname));
218
219 destroy_dev_alias(dev, "by-label/*");
220 if (packname[0])
221 make_dev_alias(dev, "by-label/%s", packname);
222
223 sp->ds_ops = ops;
224 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
225 ops->op_loadpartinfo(sp->ds_label, i, &part);
226
227 if (part.fstype) {
228 if (reprobe &&
229 (ndev = devfs_find_device_by_name("%s%c",
230 dev->si_name, 'a' + i))
231 ) {
232 /*
233 * Device already exists and
234 * is still valid.
235 */
236 ndev->si_flags |= SI_REPROBE_TEST;
237
238 /*
239 * Destroy old UUID alias
240 */
241 destroy_dev_alias(ndev,
242 "part-by-uuid/*");
243 destroy_dev_alias(ndev,
244 "part-by-label/*");
245
246 /* Create UUID alias */
247 if (!kuuid_is_nil(&part.storage_uuid)) {
248 snprintf_uuid(uuid_buf,
249 sizeof(uuid_buf),
250 &part.storage_uuid);
251 make_dev_alias(ndev,
252 "part-by-uuid/%s",
253 uuid_buf);
254 udev_dict_set_cstr(ndev, "uuid", uuid_buf);
255 }
256 if (packname[0]) {
257 make_dev_alias(ndev,
258 "part-by-label/%s.%c",
259 packname, 'a' + i);
260 }
261 } else {
262 ndev = make_dev_covering(dops,
263 dp->d_rawdev->si_ops,
264 dkmakeminor(dkunit(dp->d_cdev),
265 slice, i),
266 UID_ROOT, GID_OPERATOR, 0640,
267 "%s%c", dev->si_name, 'a'+ i);
268 ndev->si_parent = dev;
269 ndev->si_iosize_max = dev->si_iosize_max;
270 ndev->si_disk = dp;
271 udev_dict_set_cstr(ndev, "subsystem", "disk");
272 /* Inherit parent's disk type */
273 if (dp->d_disktype) {
274 udev_dict_set_cstr(ndev, "disk-type",
275 __DECONST(char *, dp->d_disktype));
276 }
277
278 /* Create serno alias */
279 if (dp->d_info.d_serialno) {
280 make_dev_alias(ndev,
281 "serno/%s.s%d%c",
282 dp->d_info.d_serialno,
283 sno, 'a' + i);
284 }
285
286 /* Create UUID alias */
287 if (!kuuid_is_nil(&part.storage_uuid)) {
288 snprintf_uuid(uuid_buf,
289 sizeof(uuid_buf),
290 &part.storage_uuid);
291 make_dev_alias(ndev,
292 "part-by-uuid/%s",
293 uuid_buf);
294 udev_dict_set_cstr(ndev, "uuid", uuid_buf);
295 }
296 if (packname[0]) {
297 make_dev_alias(ndev,
298 "part-by-label/%s.%c",
299 packname, 'a' + i);
300 }
301 ndev->si_flags |= SI_REPROBE_TEST;
302 }
303 }
304 }
305 } else if (info->d_dsflags & DSO_COMPATLABEL) {
306 msg = NULL;
307 if (sp->ds_size >= 0x100000000ULL)
308 ops = &disklabel64_ops;
309 else
310 ops = &disklabel32_ops;
311 sp->ds_label = ops->op_clone_label(info, sp);
312 } else {
313 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */
314 sp->ds_type == DOSPTYP_NETBSD ||
315 sp->ds_type == DOSPTYP_OPENBSD ||
316 sp->ds_type == DOSPTYP_DFLYBSD) {
317 log(LOG_WARNING, "%s: cannot find label (%s)\n",
318 dev->si_name, msg);
319 }
320
321 if (sp->ds_label.opaque != NULL && sp->ds_ops != NULL) {
322 /* Clear out old label - it's not around anymore */
323 disk_debug(2,
324 "disk_probe_slice: clear out old diskabel on %s\n",
325 dev->si_name);
326
327 sp->ds_ops->op_freedisklabel(&sp->ds_label);
328 sp->ds_ops = NULL;
329 }
330 }
331
332 if (msg == NULL) {
333 sp->ds_wlabel = FALSE;
334 }
335
336 return (msg ? EINVAL : 0);
337 }
338
339 /*
340 * This routine is only called for newly minted drives or to reprobe
341 * a drive with no open slices. disk_probe_slice() is called directly
342 * when reprobing partition changes within slices.
343 */
344 static void
345 disk_probe(struct disk *dp, int reprobe)
346 {
347 struct disk_info *info = &dp->d_info;
348 cdev_t dev = dp->d_cdev;
349 cdev_t ndev;
350 int error, i, sno;
351 struct diskslices *osp;
352 struct diskslice *sp;
353 struct dev_ops *dops;
354 char uuid_buf[128];
355
356 /*
357 * d_media_blksize can be 0 for non-disk storage devices such
358 * as audio CDs.
359 */
360 if (info->d_media_blksize == 0)
361 return;
362
363 osp = dp->d_slice;
364 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
365 disk_debug(1, "disk_probe (begin): %s\n", dp->d_cdev->si_name);
366
367 error = mbrinit(dev, info, &(dp->d_slice));
368 if (error) {
369 dsgone(&osp);
370 return;
371 }
372
373 dops = (dp->d_rawdev->si_ops->head.flags & D_NOEMERGPGR) ?
374 &disk2_ops : &disk1_ops;
375
376 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
377 /*
378 * Ignore the whole-disk slice, it has already been created.
379 */
380 if (i == WHOLE_DISK_SLICE)
381 continue;
382
383 #if 1
384 /*
385 * Ignore the compatibility slice s0 if it's a device mapper
386 * volume.
387 */
388 if ((i == COMPATIBILITY_SLICE) &&
389 (info->d_dsflags & DSO_DEVICEMAPPER))
390 continue;
391 #endif
392
393 sp = &dp->d_slice->dss_slices[i];
394
395 /*
396 * Handle s0. s0 is a compatibility slice if there are no
397 * other slices and it has not otherwise been set up, else
398 * we ignore it.
399 */
400 if (i == COMPATIBILITY_SLICE) {
401 sno = 0;
402 if (sp->ds_type == 0 &&
403 dp->d_slice->dss_nslices == BASE_SLICE) {
404 sp->ds_size = info->d_media_blocks;
405 sp->ds_reserved = 0;
406 }
407 } else {
408 sno = i - 1;
409 sp->ds_reserved = 0;
410 }
411
412 /*
413 * Ignore 0-length slices
414 */
415 if (sp->ds_size == 0)
416 continue;
417
418 if (reprobe &&
419 (ndev = devfs_find_device_by_name("%ss%d",
420 dev->si_name, sno))) {
421 /*
422 * Device already exists and is still valid
423 */
424 ndev->si_flags |= SI_REPROBE_TEST;
425
426 /*
427 * Destroy old UUID alias
428 */
429 destroy_dev_alias(ndev, "slice-by-uuid/*");
430
431 /* Create UUID alias */
432 if (!kuuid_is_nil(&sp->ds_stor_uuid)) {
433 snprintf_uuid(uuid_buf, sizeof(uuid_buf),
434 &sp->ds_stor_uuid);
435 make_dev_alias(ndev, "slice-by-uuid/%s",
436 uuid_buf);
437 }
438 } else {
439 /*
440 * Else create new device
441 */
442 ndev = make_dev_covering(dops, dp->d_rawdev->si_ops,
443 dkmakewholeslice(dkunit(dev), i),
444 UID_ROOT, GID_OPERATOR, 0640,
445 (info->d_dsflags & DSO_DEVICEMAPPER)?
446 "%s.s%d" : "%ss%d", dev->si_name, sno);
447 ndev->si_parent = dev;
448 ndev->si_iosize_max = dev->si_iosize_max;
449 udev_dict_set_cstr(ndev, "subsystem", "disk");
450 /* Inherit parent's disk type */
451 if (dp->d_disktype) {
452 udev_dict_set_cstr(ndev, "disk-type",
453 __DECONST(char *, dp->d_disktype));
454 }
455
456 /* Create serno alias */
457 if (dp->d_info.d_serialno) {
458 make_dev_alias(ndev, "serno/%s.s%d",
459 dp->d_info.d_serialno, sno);
460 }
461
462 /* Create UUID alias */
463 if (!kuuid_is_nil(&sp->ds_stor_uuid)) {
464 snprintf_uuid(uuid_buf, sizeof(uuid_buf),
465 &sp->ds_stor_uuid);
466 make_dev_alias(ndev, "slice-by-uuid/%s",
467 uuid_buf);
468 }
469
470 ndev->si_disk = dp;
471 ndev->si_flags |= SI_REPROBE_TEST;
472 }
473 sp->ds_dev = ndev;
474
475 /*
476 * Probe appropriate slices for a disklabel
477 *
478 * XXX slice type 1 used by our gpt probe code.
479 * XXX slice type 0 used by mbr compat slice.
480 */
481 if (sp->ds_type == DOSPTYP_386BSD ||
482 sp->ds_type == DOSPTYP_NETBSD ||
483 sp->ds_type == DOSPTYP_OPENBSD ||
484 sp->ds_type == DOSPTYP_DFLYBSD ||
485 sp->ds_type == 0 ||
486 sp->ds_type == 1) {
487 if (dp->d_slice->dss_first_bsd_slice == 0)
488 dp->d_slice->dss_first_bsd_slice = i;
489 disk_probe_slice(dp, ndev, i, reprobe);
490 }
491 }
492 dsgone(&osp);
493 disk_debug(1, "disk_probe (end): %s\n", dp->d_cdev->si_name);
494 }
495
496
497 static void
498 disk_msg_core(void *arg)
499 {
500 struct disk *dp;
501 struct diskslice *sp;
502 disk_msg_t msg;
503 int run;
504
505 lwkt_gettoken(&disklist_token);
506 lwkt_initport_thread(&disk_msg_port, curthread);
507 wakeup(curthread); /* synchronous startup */
508 lwkt_reltoken(&disklist_token);
509
510 lwkt_gettoken(&ds_token);
511 run = 1;
512
513 while (run) {
514 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
515
516 switch (msg->hdr.u.ms_result) {
517 case DISK_DISK_PROBE:
518 dp = (struct disk *)msg->load;
519 disk_debug(1,
520 "DISK_DISK_PROBE: %s\n",
521 dp->d_cdev->si_name);
522 disk_iocom_update(dp);
523 disk_probe(dp, 0);
524 break;
525 case DISK_DISK_DESTROY:
526 dp = (struct disk *)msg->load;
527 disk_debug(1,
528 "DISK_DISK_DESTROY: %s\n",
529 dp->d_cdev->si_name);
530 disk_iocom_uninit(dp);
531
532 /*
533 * Interlock against struct disk enumerations.
534 * Wait for enumerations to complete then remove
535 * the dp from the list before tearing it down.
536 * This avoids numerous races.
537 */
538 lwkt_gettoken(&disklist_token);
539 while (dp->d_refs)
540 tsleep(&dp->d_refs, 0, "diskdel", hz / 10);
541 LIST_REMOVE(dp, d_list);
542
543 dsched_disk_destroy(dp);
544 devfs_destroy_related(dp->d_cdev);
545 destroy_dev(dp->d_cdev);
546 destroy_only_dev(dp->d_rawdev);
547
548 lwkt_reltoken(&disklist_token);
549
550 if (dp->d_info.d_serialno) {
551 kfree(dp->d_info.d_serialno, M_TEMP);
552 dp->d_info.d_serialno = NULL;
553 }
554 break;
555 case DISK_UNPROBE:
556 dp = (struct disk *)msg->load;
557 disk_debug(1,
558 "DISK_DISK_UNPROBE: %s\n",
559 dp->d_cdev->si_name);
560 devfs_destroy_related(dp->d_cdev);
561 break;
562 case DISK_SLICE_REPROBE:
563 dp = (struct disk *)msg->load;
564 sp = (struct diskslice *)msg->load2;
565 devfs_clr_related_flag(sp->ds_dev,
566 SI_REPROBE_TEST);
567 disk_debug(1,
568 "DISK_SLICE_REPROBE: %s\n",
569 sp->ds_dev->si_name);
570 disk_probe_slice(dp, sp->ds_dev,
571 dkslice(sp->ds_dev), 1);
572 devfs_destroy_related_without_flag(
573 sp->ds_dev, SI_REPROBE_TEST);
574 break;
575 case DISK_DISK_REPROBE:
576 dp = (struct disk *)msg->load;
577 devfs_clr_related_flag(dp->d_cdev, SI_REPROBE_TEST);
578 disk_debug(1,
579 "DISK_DISK_REPROBE: %s\n",
580 dp->d_cdev->si_name);
581 disk_probe(dp, 1);
582 devfs_destroy_related_without_flag(
583 dp->d_cdev, SI_REPROBE_TEST);
584 break;
585 case DISK_SYNC:
586 disk_debug(1, "DISK_SYNC\n");
587 break;
588 default:
589 devfs_debug(DEVFS_DEBUG_WARNING,
590 "disk_msg_core: unknown message "
591 "received at core\n");
592 break;
593 }
594 lwkt_replymsg(&msg->hdr, 0);
595 }
596 lwkt_reltoken(&ds_token);
597 lwkt_exit();
598 }
599
600
601 /*
602 * Acts as a message drain. Any message that is replied to here gets
603 * destroyed and the memory freed.
604 */
605 static void
606 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
607 {
608 objcache_put(disk_msg_cache, msg);
609 }
610
611
612 void
613 disk_msg_send(uint32_t cmd, void *load, void *load2)
614 {
615 disk_msg_t disk_msg;
616 lwkt_port_t port = &disk_msg_port;
617
618 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
619
620 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
621
622 disk_msg->hdr.u.ms_result = cmd;
623 disk_msg->load = load;
624 disk_msg->load2 = load2;
625 KKASSERT(port);
626 lwkt_sendmsg(port, &disk_msg->hdr);
627 }
628
629 void
630 disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
631 {
632 struct lwkt_port rep_port;
633 disk_msg_t disk_msg;
634 lwkt_port_t port;
635
636 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
637 port = &disk_msg_port;
638
639 /* XXX could probably use curthread's built-in msgport */
640 lwkt_initport_thread(&rep_port, curthread);
641 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
642
643 disk_msg->hdr.u.ms_result = cmd;
644 disk_msg->load = load;
645 disk_msg->load2 = load2;
646
647 lwkt_domsg(port, &disk_msg->hdr, 0);
648 objcache_put(disk_msg_cache, disk_msg);
649 }
650
651 /*
652 * Create a raw device for the dev_ops template (which is returned). Also
653 * create a slice and unit managed disk and overload the user visible
654 * device space with it.
655 *
656 * NOTE: The returned raw device is NOT a slice and unit managed device.
657 * It is an actual raw device representing the raw disk as specified by
658 * the passed dev_ops. The disk layer not only returns such a raw device,
659 * it also uses it internally when passing (modified) commands through.
660 */
661 cdev_t
662 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
663 {
664 return _disk_create_named(NULL, unit, dp, raw_ops, 0);
665 }
666
667 cdev_t
668 disk_create_clone(int unit, struct disk *dp,
669 struct dev_ops *raw_ops)
670 {
671 return _disk_create_named(NULL, unit, dp, raw_ops, 1);
672 }
673
674 cdev_t
675 disk_create_named(const char *name, int unit, struct disk *dp,
676 struct dev_ops *raw_ops)
677 {
678 return _disk_create_named(name, unit, dp, raw_ops, 0);
679 }
680
681 cdev_t
682 disk_create_named_clone(const char *name, int unit, struct disk *dp,
683 struct dev_ops *raw_ops)
684 {
685 return _disk_create_named(name, unit, dp, raw_ops, 1);
686 }
687
688 static cdev_t
689 _disk_create_named(const char *name, int unit, struct disk *dp,
690 struct dev_ops *raw_ops, int clone)
691 {
692 cdev_t rawdev;
693 struct dev_ops *dops;
694
695 disk_debug(1, "disk_create (begin): %s%d\n", name, unit);
696
697 if (name) {
698 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
699 UID_ROOT, GID_OPERATOR, 0640, "%s", name);
700 } else {
701 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
702 UID_ROOT, GID_OPERATOR, 0640,
703 "%s%d", raw_ops->head.name, unit);
704 }
705
706 bzero(dp, sizeof(*dp));
707
708 dops = (raw_ops->head.flags & D_NOEMERGPGR) ? &disk2_ops : &disk1_ops;
709
710 dp->d_rawdev = rawdev;
711 dp->d_raw_ops = raw_ops;
712 dp->d_dev_ops = dops;
713
714 if (name) {
715 if (clone) {
716 dp->d_cdev = make_only_dev_covering(
717 dops, dp->d_rawdev->si_ops,
718 dkmakewholedisk(unit),
719 UID_ROOT, GID_OPERATOR, 0640,
720 "%s", name);
721 } else {
722 dp->d_cdev = make_dev_covering(
723 dops, dp->d_rawdev->si_ops,
724 dkmakewholedisk(unit),
725 UID_ROOT, GID_OPERATOR, 0640,
726 "%s", name);
727 }
728 } else {
729 if (clone) {
730 dp->d_cdev = make_only_dev_covering(
731 dops, dp->d_rawdev->si_ops,
732 dkmakewholedisk(unit),
733 UID_ROOT, GID_OPERATOR, 0640,
734 "%s%d", raw_ops->head.name, unit);
735 } else {
736 dp->d_cdev = make_dev_covering(
737 dops, dp->d_rawdev->si_ops,
738 dkmakewholedisk(unit),
739 UID_ROOT, GID_OPERATOR, 0640,
740 "%s%d", raw_ops->head.name, unit);
741 }
742 }
743
744 udev_dict_set_cstr(dp->d_cdev, "subsystem", "disk");
745 dp->d_cdev->si_disk = dp;
746
747 if (name)
748 dsched_disk_create(dp, name, unit);
749 else
750 dsched_disk_create(dp, raw_ops->head.name, unit);
751
752 lwkt_gettoken(&disklist_token);
753 LIST_INSERT_HEAD(&disklist, dp, d_list);
754 lwkt_reltoken(&disklist_token);
755
756 disk_iocom_init(dp);
757
758 disk_debug(1, "disk_create (end): %s%d\n",
759 (name != NULL)?(name):(raw_ops->head.name), unit);
760
761 return (dp->d_rawdev);
762 }
763
764 int
765 disk_setdisktype(struct disk *disk, const char *type)
766 {
767 int error;
768
769 KKASSERT(disk != NULL);
770
771 disk->d_disktype = type;
772 error = udev_dict_set_cstr(disk->d_cdev, "disk-type",
773 __DECONST(char *, type));
774 return error;
775 }
776
777 int
778 disk_getopencount(struct disk *disk)
779 {
780 return disk->d_opencount;
781 }
782
783 static void
784 _setdiskinfo(struct disk *disk, struct disk_info *info)
785 {
786 char *oldserialno;
787
788 oldserialno = disk->d_info.d_serialno;
789 bcopy(info, &disk->d_info, sizeof(disk->d_info));
790 info = &disk->d_info;
791
792 disk_debug(1, "_setdiskinfo: %s\n", disk->d_cdev->si_name);
793
794 /*
795 * The serial number is duplicated so the caller can throw
796 * their copy away.
797 */
798 if (info->d_serialno && info->d_serialno[0] &&
799 (info->d_serialno[0] != ' ' || strlen(info->d_serialno) > 1)) {
800 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
801 disk_cleanserial(info->d_serialno);
802 if (disk->d_cdev) {
803 make_dev_alias(disk->d_cdev, "serno/%s",
804 info->d_serialno);
805 }
806 } else {
807 info->d_serialno = NULL;
808 }
809 if (oldserialno)
810 kfree(oldserialno, M_TEMP);
811
812 dsched_disk_update(disk, info);
813
814 /*
815 * The caller may set d_media_size or d_media_blocks and we
816 * calculate the other.
817 */
818 KKASSERT(info->d_media_size == 0 || info->d_media_blocks == 0);
819 if (info->d_media_size == 0 && info->d_media_blocks) {
820 info->d_media_size = (u_int64_t)info->d_media_blocks *
821 info->d_media_blksize;
822 } else if (info->d_media_size && info->d_media_blocks == 0 &&
823 info->d_media_blksize) {
824 info->d_media_blocks = info->d_media_size /
825 info->d_media_blksize;
826 }
827
828 /*
829 * The si_* fields for rawdev are not set until after the
830 * disk_create() call, so someone using the cooked version
831 * of the raw device (i.e. da0s0) will not get the right
832 * si_iosize_max unless we fix it up here.
833 */
834 if (disk->d_cdev && disk->d_rawdev &&
835 disk->d_cdev->si_iosize_max == 0) {
836 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
837 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
838 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
839 }
840
841 /* Add the serial number to the udev_dictionary */
842 if (info->d_serialno)
843 udev_dict_set_cstr(disk->d_cdev, "serno", info->d_serialno);
844 }
845
846 /*
847 * Disk drivers must call this routine when media parameters are available
848 * or have changed.
849 */
850 void
851 disk_setdiskinfo(struct disk *disk, struct disk_info *info)
852 {
853 _setdiskinfo(disk, info);
854 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
855 disk_debug(1, "disk_setdiskinfo: sent probe for %s\n",
856 disk->d_cdev->si_name);
857 }
858
859 void
860 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
861 {
862 _setdiskinfo(disk, info);
863 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
864 disk_debug(1, "disk_setdiskinfo_sync: sent probe for %s\n",
865 disk->d_cdev->si_name);
866 }
867
868 /*
869 * This routine is called when an adapter detaches. The higher level
870 * managed disk device is destroyed while the lower level raw device is
871 * released.
872 */
873 void
874 disk_destroy(struct disk *disk)
875 {
876 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
877 return;
878 }
879
880 int
881 disk_dumpcheck(cdev_t dev, u_int64_t *size,
882 u_int64_t *blkno, u_int32_t *secsize)
883 {
884 struct partinfo pinfo;
885 int error;
886
887 if (size)
888 *size = 0; /* avoid gcc warnings */
889 if (secsize)
890 *secsize = 512; /* avoid gcc warnings */
891 bzero(&pinfo, sizeof(pinfo));
892
893 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0,
894 proc0.p_ucred, NULL, NULL);
895 if (error)
896 return (error);
897
898 if (pinfo.media_blksize == 0)
899 return (ENXIO);
900
901 if (blkno) /* XXX: make sure this reserved stuff is right */
902 *blkno = pinfo.reserved_blocks +
903 pinfo.media_offset / pinfo.media_blksize;
904 if (secsize)
905 *secsize = pinfo.media_blksize;
906 if (size)
907 *size = (pinfo.media_blocks - pinfo.reserved_blocks);
908
909 return (0);
910 }
911
912 int
913 disk_dumpconf(cdev_t dev, u_int onoff)
914 {
915 struct dumperinfo di;
916 u_int64_t size, blkno;
917 u_int32_t secsize;
918 int error;
919
920 if (!onoff)
921 return set_dumper(NULL);
922
923 error = disk_dumpcheck(dev, &size, &blkno, &secsize);
924
925 if (error)
926 return ENXIO;
927
928 bzero(&di, sizeof(struct dumperinfo));
929 di.dumper = diskdump;
930 di.priv = dev;
931 di.blocksize = secsize;
932 di.maxiosize = dev->si_iosize_max;
933 di.mediaoffset = blkno * DEV_BSIZE;
934 di.mediasize = size * DEV_BSIZE;
935
936 return set_dumper(&di);
937 }
938
939 void
940 disk_unprobe(struct disk *disk)
941 {
942 if (disk == NULL)
943 return;
944
945 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
946 }
947
948 void
949 disk_invalidate (struct disk *disk)
950 {
951 dsgone(&disk->d_slice);
952 }
953
954 /*
955 * Enumerate disks, pass a marker and an initial NULL dp to initialize,
956 * then loop with the previously returned dp.
957 *
958 * The returned dp will be referenced, preventing its destruction. When
959 * you pass the returned dp back into the loop the ref is dropped.
960 *
961 * WARNING: If terminating your loop early you must call
962 * disk_enumerate_stop().
963 */
964 struct disk *
965 disk_enumerate(struct disk *marker, struct disk *dp)
966 {
967 lwkt_gettoken(&disklist_token);
968 if (dp) {
969 --dp->d_refs;
970 dp = LIST_NEXT(marker, d_list);
971 LIST_REMOVE(marker, d_list);
972 } else {
973 bzero(marker, sizeof(*marker));
974 marker->d_flags = DISKFLAG_MARKER;
975 dp = LIST_FIRST(&disklist);
976 }
977 while (dp) {
978 if ((dp->d_flags & DISKFLAG_MARKER) == 0)
979 break;
980 dp = LIST_NEXT(dp, d_list);
981 }
982 if (dp) {
983 ++dp->d_refs;
984 LIST_INSERT_AFTER(dp, marker, d_list);
985 }
986 lwkt_reltoken(&disklist_token);
987 return (dp);
988 }
989
990 /*
991 * Terminate an enumeration early. Do not call this function if the
992 * enumeration ended normally. dp can be NULL, indicating that you
993 * wish to retain the ref count on dp.
994 *
995 * This function removes the marker.
996 */
997 void
998 disk_enumerate_stop(struct disk *marker, struct disk *dp)
999 {
1000 lwkt_gettoken(&disklist_token);
1001 LIST_REMOVE(marker, d_list);
1002 if (dp)
1003 --dp->d_refs;
1004 lwkt_reltoken(&disklist_token);
1005 }
1006
1007 static
1008 int
1009 sysctl_disks(SYSCTL_HANDLER_ARGS)
1010 {
1011 struct disk marker;
1012 struct disk *dp;
1013 int error, first;
1014
1015 first = 1;
1016 error = 0;
1017 dp = NULL;
1018
1019 while ((dp = disk_enumerate(&marker, dp))) {
1020 if (!first) {
1021 error = SYSCTL_OUT(req, " ", 1);
1022 if (error) {
1023 disk_enumerate_stop(&marker, dp);
1024 break;
1025 }
1026 } else {
1027 first = 0;
1028 }
1029 error = SYSCTL_OUT(req, dp->d_rawdev->si_name,
1030 strlen(dp->d_rawdev->si_name));
1031 if (error) {
1032 disk_enumerate_stop(&marker, dp);
1033 break;
1034 }
1035 }
1036 if (error == 0)
1037 error = SYSCTL_OUT(req, "", 1);
1038 return error;
1039 }
1040
1041 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
1042 sysctl_disks, "A", "names of available disks");
1043
1044 /*
1045 * Open a disk device or partition.
1046 */
1047 static
1048 int
1049 diskopen(struct dev_open_args *ap)
1050 {
1051 cdev_t dev = ap->a_head.a_dev;
1052 struct disk *dp;
1053 int error;
1054
1055 /*
1056 * dp can't be NULL here XXX.
1057 *
1058 * d_slice will be NULL if setdiskinfo() has not been called yet.
1059 * setdiskinfo() is typically called whether the disk is present
1060 * or not (e.g. CD), but the base disk device is created first
1061 * and there may be a race.
1062 */
1063 dp = dev->si_disk;
1064 if (dp == NULL || dp->d_slice == NULL)
1065 return (ENXIO);
1066 error = 0;
1067
1068 /*
1069 * Deal with open races
1070 */
1071 lwkt_gettoken(&ds_token);
1072 while (dp->d_flags & DISKFLAG_LOCK) {
1073 dp->d_flags |= DISKFLAG_WANTED;
1074 error = tsleep(dp, PCATCH, "diskopen", hz);
1075 if (error) {
1076 lwkt_reltoken(&ds_token);
1077 return (error);
1078 }
1079 }
1080 dp->d_flags |= DISKFLAG_LOCK;
1081
1082 /*
1083 * Open the underlying raw device.
1084 */
1085 if (!dsisopen(dp->d_slice)) {
1086 #if 0
1087 if (!pdev->si_iosize_max)
1088 pdev->si_iosize_max = dev->si_iosize_max;
1089 #endif
1090 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
1091 ap->a_devtype, ap->a_cred, NULL, NULL);
1092 }
1093
1094 if (error)
1095 goto out;
1096 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
1097 &dp->d_slice, &dp->d_info);
1098 if (!dsisopen(dp->d_slice)) {
1099 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype, NULL);
1100 }
1101 out:
1102 dp->d_flags &= ~DISKFLAG_LOCK;
1103 if (dp->d_flags & DISKFLAG_WANTED) {
1104 dp->d_flags &= ~DISKFLAG_WANTED;
1105 wakeup(dp);
1106 }
1107 lwkt_reltoken(&ds_token);
1108
1109 KKASSERT(dp->d_opencount >= 0);
1110 /* If the open was successful, bump open count */
1111 if (error == 0)
1112 atomic_add_int(&dp->d_opencount, 1);
1113
1114 return(error);
1115 }
1116
1117 /*
1118 * Close a disk device or partition
1119 */
1120 static
1121 int
1122 diskclose(struct dev_close_args *ap)
1123 {
1124 cdev_t dev = ap->a_head.a_dev;
1125 struct disk *dp;
1126 int error;
1127 int lcount;
1128
1129 error = 0;
1130 dp = dev->si_disk;
1131
1132 /*
1133 * The cdev_t represents the disk/slice/part. The shared
1134 * dp structure governs all cdevs associated with the disk.
1135 *
1136 * As a safety only close the underlying raw device on the last
1137 * close the disk device if our tracking of the slices/partitions
1138 * also indicates nothing is open.
1139 */
1140 KKASSERT(dp->d_opencount >= 1);
1141 lcount = atomic_fetchadd_int(&dp->d_opencount, -1);
1142
1143 lwkt_gettoken(&ds_token);
1144 dsclose(dev, ap->a_devtype, dp->d_slice);
1145 if (lcount <= 1 && !dsisopen(dp->d_slice)) {
1146 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype, NULL);
1147 }
1148 lwkt_reltoken(&ds_token);
1149
1150 return (error);
1151 }
1152
1153 /*
1154 * First execute the ioctl on the disk device, and if it isn't supported
1155 * try running it on the backing device.
1156 */
1157 static
1158 int
1159 diskioctl(struct dev_ioctl_args *ap)
1160 {
1161 cdev_t dev = ap->a_head.a_dev;
1162 struct disk *dp;
1163 int error;
1164 u_int u;
1165
1166 dp = dev->si_disk;
1167 if (dp == NULL)
1168 return (ENXIO);
1169
1170 devfs_debug(DEVFS_DEBUG_DEBUG,
1171 "diskioctl: cmd is: %lx (name: %s)\n",
1172 ap->a_cmd, dev->si_name);
1173 devfs_debug(DEVFS_DEBUG_DEBUG,
1174 "diskioctl: &dp->d_slice is: %p, %p\n",
1175 &dp->d_slice, dp->d_slice);
1176
1177 if (ap->a_cmd == DIOCGKERNELDUMP) {
1178 u = *(u_int *)ap->a_data;
1179 return disk_dumpconf(dev, u);
1180 }
1181
1182 if (ap->a_cmd == DIOCRECLUSTER && dev == dp->d_cdev) {
1183 error = disk_iocom_ioctl(dp, ap->a_cmd, ap->a_data);
1184 return error;
1185 }
1186
1187 if (&dp->d_slice == NULL || dp->d_slice == NULL ||
1188 ((dp->d_info.d_dsflags & DSO_DEVICEMAPPER) &&
1189 dkslice(dev) == WHOLE_DISK_SLICE)) {
1190 error = ENOIOCTL;
1191 } else {
1192 lwkt_gettoken(&ds_token);
1193 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
1194 &dp->d_slice, &dp->d_info);
1195 lwkt_reltoken(&ds_token);
1196 }
1197
1198 if (error == ENOIOCTL) {
1199 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
1200 ap->a_fflag, ap->a_cred, NULL, NULL);
1201 }
1202 return (error);
1203 }
1204
1205 /*
1206 * Execute strategy routine
1207 *
1208 * WARNING! We are using the KVABIO API and must not access memory
1209 * through bp->b_data without first calling bkvasync(bp).
1210 */
1211 static
1212 int
1213 diskstrategy(struct dev_strategy_args *ap)
1214 {
1215 cdev_t dev = ap->a_head.a_dev;
1216 struct bio *bio = ap->a_bio;
1217 struct bio *nbio;
1218 struct disk *dp;
1219
1220 dp = dev->si_disk;
1221
1222 if (dp == NULL) {
1223 bio->bio_buf->b_error = ENXIO;
1224 bio->bio_buf->b_flags |= B_ERROR;
1225 biodone(bio);
1226 return(0);
1227 }
1228 KKASSERT(dev->si_disk == dp);
1229
1230 /*
1231 * The dscheck() function will also transform the slice relative
1232 * block number i.e. bio->bio_offset into a block number that can be
1233 * passed directly to the underlying raw device. If dscheck()
1234 * returns NULL it will have handled the bio for us (e.g. EOF
1235 * or error due to being beyond the device size).
1236 */
1237 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
1238 dev_dstrategy(dp->d_rawdev, nbio);
1239 } else {
1240 biodone(bio);
1241 }
1242 return(0);
1243 }
1244
1245 /*
1246 * Return the partition size in ?blocks?
1247 */
1248 static
1249 int
1250 diskpsize(struct dev_psize_args *ap)
1251 {
1252 cdev_t dev = ap->a_head.a_dev;
1253 struct disk *dp;
1254
1255 dp = dev->si_disk;
1256 if (dp == NULL)
1257 return(ENODEV);
1258
1259 ap->a_result = dssize(dev, &dp->d_slice);
1260
1261 if ((ap->a_result == -1) &&
1262 (dp->d_info.d_dsflags & DSO_RAWPSIZE)) {
1263 ap->a_head.a_dev = dp->d_rawdev;
1264 return dev_doperate(&ap->a_head);
1265 }
1266 return(0);
1267 }
1268
1269 static int
1270 diskdump(struct dev_dump_args *ap)
1271 {
1272 cdev_t dev = ap->a_head.a_dev;
1273 struct disk *dp = dev->si_disk;
1274 u_int64_t size, offset;
1275 int error;
1276
1277 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize);
1278 /* XXX: this should probably go in disk_dumpcheck somehow */
1279 if (ap->a_length != 0) {
1280 size *= DEV_BSIZE;
1281 offset = ap->a_blkno * DEV_BSIZE;
1282 if ((ap->a_offset < offset) ||
1283 (ap->a_offset + ap->a_length - offset > size)) {
1284 kprintf("Attempt to write outside dump "
1285 "device boundaries.\n");
1286 error = ENOSPC;
1287 }
1288 }
1289
1290 if (error == 0) {
1291 ap->a_head.a_dev = dp->d_rawdev;
1292 error = dev_doperate(&ap->a_head);
1293 }
1294
1295 return(error);
1296 }
1297
1298
1299 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
1300 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
1301
1302 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
1303 0, sizeof(struct disk), "sizeof(struct disk)");
1304
1305 /*
1306 * Reorder interval for burst write allowance and minor write
1307 * allowance.
1308 *
1309 * We always want to trickle some writes in to make use of the
1310 * disk's zone cache. Bursting occurs on a longer interval and only
1311 * runningbufspace is well over the hirunningspace limit.
1312 */
1313 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */
1314 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval,
1315 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, "");
1316 int bioq_reorder_minor_interval = 5;
1317 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval,
1318 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, "");
1319
1320 int bioq_reorder_burst_bytes = 3000000;
1321 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes,
1322 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, "");
1323 int bioq_reorder_minor_bytes = 262144;
1324 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes,
1325 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, "");
1326
1327
1328 /*
1329 * Order I/Os. Generally speaking this code is designed to make better
1330 * use of drive zone caches. A drive zone cache can typically track linear
1331 * reads or writes for around 16 zones simultaniously.
1332 *
1333 * Read prioritization issues: It is possible for hundreds of megabytes worth
1334 * of writes to be queued asynchronously. This creates a huge bottleneck
1335 * for reads which reduce read bandwidth to a trickle.
1336 *
1337 * To solve this problem we generally reorder reads before writes.
1338 *
1339 * However, a large number of random reads can also starve writes and
1340 * make poor use of the drive zone cache so we allow writes to trickle
1341 * in every N reads.
1342 */
1343 void
1344 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
1345 {
1346 #if 0
1347 /*
1348 * The BIO wants to be ordered. Adding to the tail also
1349 * causes transition to be set to NULL, forcing the ordering
1350 * of all prior I/O's.
1351 */
1352 if (bio->bio_buf->b_flags & B_ORDERED) {
1353 bioq_insert_tail(bioq, bio);
1354 return;
1355 }
1356 #endif
1357
1358 switch(bio->bio_buf->b_cmd) {
1359 case BUF_CMD_READ:
1360 if (bioq->transition) {
1361 /*
1362 * Insert before the first write. Bleedover writes
1363 * based on reorder intervals to prevent starvation.
1364 */
1365 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act);
1366 ++bioq->reorder;
1367 if (bioq->reorder % bioq_reorder_minor_interval == 0) {
1368 bioqwritereorder(bioq);
1369 if (bioq->reorder >=
1370 bioq_reorder_burst_interval) {
1371 bioq->reorder = 0;
1372 }
1373 }
1374 } else {
1375 /*
1376 * No writes queued (or ordering was forced),
1377 * insert at tail.
1378 */
1379 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1380 }
1381 break;
1382 case BUF_CMD_WRITE:
1383 /*
1384 * Writes are always appended. If no writes were previously
1385 * queued or an ordered tail insertion occured the transition
1386 * field will be NULL.
1387 */
1388 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1389 if (bioq->transition == NULL)
1390 bioq->transition = bio;
1391 break;
1392 default:
1393 /*
1394 * All other request types are forced to be ordered.
1395 */
1396 bioq_insert_tail(bioq, bio);
1397 break;
1398 }
1399 }
1400
1401 /*
1402 * Move the read-write transition point to prevent reads from
1403 * completely starving our writes. This brings a number of writes into
1404 * the fold every N reads.
1405 *
1406 * We bring a few linear writes into the fold on a minor interval
1407 * and we bring a non-linear burst of writes into the fold on a major
1408 * interval. Bursting only occurs if runningbufspace is really high
1409 * (typically from syncs, fsyncs, or HAMMER flushes).
1410 */
1411 static
1412 void
1413 bioqwritereorder(struct bio_queue_head *bioq)
1414 {
1415 struct bio *bio;
1416 off_t next_offset;
1417 size_t left;
1418 size_t n;
1419 int check_off;
1420
1421 if (bioq->reorder < bioq_reorder_burst_interval ||
1422 !buf_runningbufspace_severe()) {
1423 left = (size_t)bioq_reorder_minor_bytes;
1424 check_off = 1;
1425 } else {
1426 left = (size_t)bioq_reorder_burst_bytes;
1427 check_off = 0;
1428 }
1429
1430 next_offset = bioq->transition->bio_offset;
1431 while ((bio = bioq->transition) != NULL &&
1432 (check_off == 0 || next_offset == bio->bio_offset)
1433 ) {
1434 n = bio->bio_buf->b_bcount;
1435 next_offset = bio->bio_offset + n;
1436 bioq->transition = TAILQ_NEXT(bio, bio_act);
1437 if (left < n)
1438 break;
1439 left -= n;
1440 }
1441 }
1442
1443 /*
1444 * Bounds checking against the media size, used for the raw partition.
1445 * secsize, mediasize and b_blkno must all be the same units.
1446 * Possibly this has to be DEV_BSIZE (512).
1447 */
1448 int
1449 bounds_check_with_mediasize(struct bio *bio, int secsize, uint64_t mediasize)
1450 {
1451 struct buf *bp = bio->bio_buf;
1452 int64_t sz;
1453
1454 sz = howmany(bp->b_bcount, secsize);
1455
1456 if (bio->bio_offset/DEV_BSIZE + sz > mediasize) {
1457 sz = mediasize - bio->bio_offset/DEV_BSIZE;
1458 if (sz == 0) {
1459 /* If exactly at end of disk, return EOF. */
1460 bp->b_resid = bp->b_bcount;
1461 return 0;
1462 }
1463 if (sz < 0) {
1464 /* If past end of disk, return EINVAL. */
1465 bp->b_error = EINVAL;
1466 return 0;
1467 }
1468 /* Otherwise, truncate request. */
1469 bp->b_bcount = sz * secsize;
1470 }
1471
1472 return 1;
1473 }
1474
1475 /*
1476 * Disk error is the preface to plaintive error messages
1477 * about failing disk transfers. It prints messages of the form
1478
1479 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1480
1481 * if the offset of the error in the transfer and a disk label
1482 * are both available. blkdone should be -1 if the position of the error
1483 * is unknown; the disklabel pointer may be null from drivers that have not
1484 * been converted to use them. The message is printed with kprintf
1485 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1486 * The message should be completed (with at least a newline) with kprintf
1487 * or log(-1, ...), respectively. There is no trailing space.
1488 */
1489 void
1490 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
1491 {
1492 struct buf *bp = bio->bio_buf;
1493 const char *term;
1494
1495 switch(bp->b_cmd) {
1496 case BUF_CMD_READ:
1497 term = "read";
1498 break;
1499 case BUF_CMD_WRITE:
1500 term = "write";
1501 break;
1502 default:
1503 term = "access";
1504 break;
1505 }
1506 kprintf("%s: %s %sing ", dev->si_name, what, term);
1507 kprintf("offset %012llx for %d",
1508 (long long)bio->bio_offset,
1509 bp->b_bcount);
1510
1511 if (donecnt)
1512 kprintf(" (%d bytes completed)", donecnt);
1513 }
1514
1515 /*
1516 * Locate a disk device
1517 */
1518 cdev_t
1519 disk_locate(const char *devname)
1520 {
1521 return devfs_find_device_by_name("%s", devname);
1522 }
1523
1524 void
1525 disk_config(void *arg)
1526 {
1527 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
1528 }
1529
1530 static void
1531 disk_init(void)
1532 {
1533 struct thread* td_core;
1534
1535 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1536 NULL, NULL, NULL,
1537 objcache_malloc_alloc,
1538 objcache_malloc_free,
1539 &disk_msg_malloc_args);
1540
1541 lwkt_token_init(&disklist_token, "disks");
1542 lwkt_token_init(&ds_token, "ds");
1543
1544 /*
1545 * Initialize the reply-only port which acts as a message drain
1546 */
1547 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1548
1549 lwkt_gettoken(&disklist_token);
1550 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1551 0, -1, "disk_msg_core");
1552 tsleep(td_core, 0, "diskcore", 0);
1553 lwkt_reltoken(&disklist_token);
1554 }
1555
1556 static void
1557 disk_uninit(void)
1558 {
1559 objcache_destroy(disk_msg_cache);
1560 }
1561
1562 /*
1563 * Clean out illegal characters in serial numbers.
1564 */
1565 static void
1566 disk_cleanserial(char *serno)
1567 {
1568 char c;
1569
1570 while ((c = *serno) != 0) {
1571 if (c >= 'a' && c <= 'z')
1572 ;
1573 else if (c >= 'A' && c <= 'Z')
1574 ;
1575 else if (c >= '0' && c <= '9')
1576 ;
1577 else if (c == '-' || c == '@' || c == '+' || c == '.')
1578 ;
1579 else
1580 c = '_';
1581 *serno++= c;
1582 }
1583 }
1584
1585 TUNABLE_INT("kern.disk_debug", &disk_debug_enable);
1586 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable,
1587 0, "Enable subr_disk debugging");
1588
1589 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1590 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);
DragonFly BSD