2 * Copyright (c) 2003,2004,2009 The DragonFly Project. All rights reserved.
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>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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
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.
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
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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
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 * ----------------------------------------------------------------------------
42 * Copyright (c) 1982, 1986, 1988, 1993
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45 * All or some portions of this file are derived from material licensed
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48 * the permission of UNIX System Laboratories, Inc.
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54 * notice, this list of conditions and the following disclaimer.
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60 * This product includes software developed by the University of
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67 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
68 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
69 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
70 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
71 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
72 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
73 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
74 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
75 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
78 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
79 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
80 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
83 #include <sys/param.h>
84 #include <sys/systm.h>
85 #include <sys/kernel.h>
87 #include <sys/sysctl.h>
90 #include <sys/disklabel.h>
91 #include <sys/disklabel32.h>
92 #include <sys/disklabel64.h>
93 #include <sys/diskslice.h>
94 #include <sys/diskmbr.h>
96 #include <sys/kerneldump.h>
97 #include <sys/malloc.h>
98 #include <machine/md_var.h>
99 #include <sys/ctype.h>
100 #include <sys/syslog.h>
101 #include <sys/device.h>
102 #include <sys/msgport.h>
103 #include <sys/devfs.h>
104 #include <sys/thread.h>
105 #include <sys/dsched.h>
106 #include <sys/queue.h>
107 #include <sys/lock.h>
108 #include <sys/udev.h>
109 #include <sys/uuid.h>
111 #include <sys/buf2.h>
112 #include <sys/mplock2.h>
113 #include <sys/msgport2.h>
114 #include <sys/thread2.h>
116 static MALLOC_DEFINE(M_DISK, "disk", "disk data");
117 static int disk_debug_enable = 0;
119 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
120 static void disk_msg_core(void *);
121 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe);
122 static void disk_probe(struct disk *dp, int reprobe);
123 static void _setdiskinfo(struct disk *disk, struct disk_info *info);
124 static void bioqwritereorder(struct bio_queue_head *bioq);
125 static void disk_cleanserial(char *serno);
126 static int disk_debug(int, char *, ...) __printflike(2, 3);
127 static cdev_t _disk_create_named(const char *name, int unit, struct disk *dp,
128 struct dev_ops *raw_ops, int clone);
130 static d_open_t diskopen;
131 static d_close_t diskclose;
132 static d_ioctl_t diskioctl;
133 static d_strategy_t diskstrategy;
134 static d_psize_t diskpsize;
135 static d_dump_t diskdump;
137 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
138 static struct lwkt_token disklist_token;
140 static struct dev_ops disk_ops = {
141 { "disk", 0, D_DISK | D_MPSAFE | D_TRACKCLOSE },
143 .d_close = diskclose,
145 .d_write = physwrite,
146 .d_ioctl = diskioctl,
147 .d_strategy = diskstrategy,
149 .d_psize = diskpsize,
152 static struct objcache *disk_msg_cache;
154 struct objcache_malloc_args disk_msg_malloc_args = {
155 sizeof(struct disk_msg), M_DISK };
157 static struct lwkt_port disk_dispose_port;
158 static struct lwkt_port disk_msg_port;
161 disk_debug(int level, char *fmt, ...)
166 if (level <= disk_debug_enable)
174 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
176 struct disk_info *info = &dp->d_info;
177 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
179 struct partinfo part;
187 "disk_probe_slice (begin): %s (%s)\n",
188 dev->si_name, dp->d_cdev->si_name);
190 sno = slice ? slice - 1 : 0;
192 ops = &disklabel32_ops;
193 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
194 if (msg && !strcmp(msg, "no disk label")) {
195 ops = &disklabel64_ops;
196 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
200 if (slice != WHOLE_DISK_SLICE)
201 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
206 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
207 ops->op_loadpartinfo(sp->ds_label, i, &part);
210 (ndev = devfs_find_device_by_name("%s%c",
211 dev->si_name, 'a' + i))
214 * Device already exists and
217 ndev->si_flags |= SI_REPROBE_TEST;
220 * Destroy old UUID alias
222 destroy_dev_alias(ndev, "part-by-uuid/*");
224 /* Create UUID alias */
225 if (!kuuid_is_nil(&part.storage_uuid)) {
226 snprintf_uuid(uuid_buf,
232 udev_dict_set_cstr(ndev, "uuid", uuid_buf);
235 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
236 dkmakeminor(dkunit(dp->d_cdev),
238 UID_ROOT, GID_OPERATOR, 0640,
239 "%s%c", dev->si_name, 'a'+ i);
240 ndev->si_parent = dev;
242 udev_dict_set_cstr(ndev, "subsystem", "disk");
243 /* Inherit parent's disk type */
244 if (dp->d_disktype) {
245 udev_dict_set_cstr(ndev, "disk-type",
246 __DECONST(char *, dp->d_disktype));
249 /* Create serno alias */
250 if (dp->d_info.d_serialno) {
253 dp->d_info.d_serialno,
257 /* Create UUID alias */
258 if (!kuuid_is_nil(&part.storage_uuid)) {
259 snprintf_uuid(uuid_buf,
265 udev_dict_set_cstr(ndev, "uuid", uuid_buf);
267 ndev->si_flags |= SI_REPROBE_TEST;
271 } else if (info->d_dsflags & DSO_COMPATLABEL) {
273 if (sp->ds_size >= 0x100000000ULL)
274 ops = &disklabel64_ops;
276 ops = &disklabel32_ops;
277 sp->ds_label = ops->op_clone_label(info, sp);
279 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */
280 sp->ds_type == DOSPTYP_NETBSD ||
281 sp->ds_type == DOSPTYP_OPENBSD) {
282 log(LOG_WARNING, "%s: cannot find label (%s)\n",
286 if (sp->ds_label.opaque != NULL && sp->ds_ops != NULL) {
287 /* Clear out old label - it's not around anymore */
289 "disk_probe_slice: clear out old diskabel on %s\n",
292 sp->ds_ops->op_freedisklabel(&sp->ds_label);
298 sp->ds_wlabel = FALSE;
301 return (msg ? EINVAL : 0);
305 * This routine is only called for newly minted drives or to reprobe
306 * a drive with no open slices. disk_probe_slice() is called directly
307 * when reprobing partition changes within slices.
310 disk_probe(struct disk *dp, int reprobe)
312 struct disk_info *info = &dp->d_info;
313 cdev_t dev = dp->d_cdev;
316 struct diskslices *osp;
317 struct diskslice *sp;
320 KKASSERT (info->d_media_blksize != 0);
323 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
324 disk_debug(1, "disk_probe (begin): %s\n", dp->d_cdev->si_name);
326 error = mbrinit(dev, info, &(dp->d_slice));
332 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
334 * Ignore the whole-disk slice, it has already been created.
336 if (i == WHOLE_DISK_SLICE)
341 * Ignore the compatibility slice s0 if it's a device mapper
344 if ((i == COMPATIBILITY_SLICE) &&
345 (info->d_dsflags & DSO_DEVICEMAPPER))
349 sp = &dp->d_slice->dss_slices[i];
352 * Handle s0. s0 is a compatibility slice if there are no
353 * other slices and it has not otherwise been set up, else
356 if (i == COMPATIBILITY_SLICE) {
358 if (sp->ds_type == 0 &&
359 dp->d_slice->dss_nslices == BASE_SLICE) {
360 sp->ds_size = info->d_media_blocks;
369 * Ignore 0-length slices
371 if (sp->ds_size == 0)
375 (ndev = devfs_find_device_by_name("%ss%d",
376 dev->si_name, sno))) {
378 * Device already exists and is still valid
380 ndev->si_flags |= SI_REPROBE_TEST;
383 * Destroy old UUID alias
385 destroy_dev_alias(ndev, "slice-by-uuid/*");
387 /* Create UUID alias */
388 if (!kuuid_is_nil(&sp->ds_stor_uuid)) {
389 snprintf_uuid(uuid_buf, sizeof(uuid_buf),
391 make_dev_alias(ndev, "slice-by-uuid/%s",
396 * Else create new device
398 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
399 dkmakewholeslice(dkunit(dev), i),
400 UID_ROOT, GID_OPERATOR, 0640,
401 (info->d_dsflags & DSO_DEVICEMAPPER)?
402 "%s.s%d" : "%ss%d", dev->si_name, sno);
403 ndev->si_parent = dev;
404 udev_dict_set_cstr(ndev, "subsystem", "disk");
405 /* Inherit parent's disk type */
406 if (dp->d_disktype) {
407 udev_dict_set_cstr(ndev, "disk-type",
408 __DECONST(char *, dp->d_disktype));
411 /* Create serno alias */
412 if (dp->d_info.d_serialno) {
413 make_dev_alias(ndev, "serno/%s.s%d",
414 dp->d_info.d_serialno, sno);
417 /* Create UUID alias */
418 if (!kuuid_is_nil(&sp->ds_stor_uuid)) {
419 snprintf_uuid(uuid_buf, sizeof(uuid_buf),
421 make_dev_alias(ndev, "slice-by-uuid/%s",
426 ndev->si_flags |= SI_REPROBE_TEST;
431 * Probe appropriate slices for a disklabel
433 * XXX slice type 1 used by our gpt probe code.
434 * XXX slice type 0 used by mbr compat slice.
436 if (sp->ds_type == DOSPTYP_386BSD ||
437 sp->ds_type == DOSPTYP_NETBSD ||
438 sp->ds_type == DOSPTYP_OPENBSD ||
441 if (dp->d_slice->dss_first_bsd_slice == 0)
442 dp->d_slice->dss_first_bsd_slice = i;
443 disk_probe_slice(dp, ndev, i, reprobe);
447 disk_debug(1, "disk_probe (end): %s\n", dp->d_cdev->si_name);
452 disk_msg_core(void *arg)
455 struct diskslice *sp;
459 lwkt_gettoken(&disklist_token);
460 lwkt_initport_thread(&disk_msg_port, curthread);
461 wakeup(curthread); /* synchronous startup */
462 lwkt_reltoken(&disklist_token);
464 get_mplock(); /* not mpsafe yet? */
468 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
470 switch (msg->hdr.u.ms_result) {
471 case DISK_DISK_PROBE:
472 dp = (struct disk *)msg->load;
474 "DISK_DISK_PROBE: %s\n",
475 dp->d_cdev->si_name);
478 case DISK_DISK_DESTROY:
479 dp = (struct disk *)msg->load;
481 "DISK_DISK_DESTROY: %s\n",
482 dp->d_cdev->si_name);
483 devfs_destroy_related(dp->d_cdev);
484 destroy_dev(dp->d_cdev);
485 destroy_only_dev(dp->d_rawdev);
486 lwkt_gettoken(&disklist_token);
487 LIST_REMOVE(dp, d_list);
488 lwkt_reltoken(&disklist_token);
489 if (dp->d_info.d_serialno) {
490 kfree(dp->d_info.d_serialno, M_TEMP);
491 dp->d_info.d_serialno = NULL;
495 dp = (struct disk *)msg->load;
497 "DISK_DISK_UNPROBE: %s\n",
498 dp->d_cdev->si_name);
499 devfs_destroy_related(dp->d_cdev);
501 case DISK_SLICE_REPROBE:
502 dp = (struct disk *)msg->load;
503 sp = (struct diskslice *)msg->load2;
504 devfs_clr_related_flag(sp->ds_dev,
507 "DISK_SLICE_REPROBE: %s\n",
508 sp->ds_dev->si_name);
509 disk_probe_slice(dp, sp->ds_dev,
510 dkslice(sp->ds_dev), 1);
511 devfs_destroy_related_without_flag(
512 sp->ds_dev, SI_REPROBE_TEST);
514 case DISK_DISK_REPROBE:
515 dp = (struct disk *)msg->load;
516 devfs_clr_related_flag(dp->d_cdev, SI_REPROBE_TEST);
518 "DISK_DISK_REPROBE: %s\n",
519 dp->d_cdev->si_name);
521 devfs_destroy_related_without_flag(
522 dp->d_cdev, SI_REPROBE_TEST);
525 disk_debug(1, "DISK_SYNC\n");
528 devfs_debug(DEVFS_DEBUG_WARNING,
529 "disk_msg_core: unknown message "
530 "received at core\n");
533 lwkt_replymsg(&msg->hdr, 0);
540 * Acts as a message drain. Any message that is replied to here gets
541 * destroyed and the memory freed.
544 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
546 objcache_put(disk_msg_cache, msg);
551 disk_msg_send(uint32_t cmd, void *load, void *load2)
554 lwkt_port_t port = &disk_msg_port;
556 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
558 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
560 disk_msg->hdr.u.ms_result = cmd;
561 disk_msg->load = load;
562 disk_msg->load2 = load2;
564 lwkt_sendmsg(port, &disk_msg->hdr);
568 disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
570 struct lwkt_port rep_port;
574 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
575 port = &disk_msg_port;
577 /* XXX could probably use curthread's built-in msgport */
578 lwkt_initport_thread(&rep_port, curthread);
579 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
581 disk_msg->hdr.u.ms_result = cmd;
582 disk_msg->load = load;
583 disk_msg->load2 = load2;
585 lwkt_sendmsg(port, &disk_msg->hdr);
586 lwkt_waitmsg(&disk_msg->hdr, 0);
587 objcache_put(disk_msg_cache, disk_msg);
591 * Create a raw device for the dev_ops template (which is returned). Also
592 * create a slice and unit managed disk and overload the user visible
593 * device space with it.
595 * NOTE: The returned raw device is NOT a slice and unit managed device.
596 * It is an actual raw device representing the raw disk as specified by
597 * the passed dev_ops. The disk layer not only returns such a raw device,
598 * it also uses it internally when passing (modified) commands through.
601 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
603 return _disk_create_named(NULL, unit, dp, raw_ops, 0);
607 disk_create_clone(int unit, struct disk *dp, struct dev_ops *raw_ops)
609 return _disk_create_named(NULL, unit, dp, raw_ops, 1);
613 disk_create_named(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops)
615 return _disk_create_named(name, unit, dp, raw_ops, 0);
619 disk_create_named_clone(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops)
621 return _disk_create_named(name, unit, dp, raw_ops, 1);
625 _disk_create_named(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops, int clone)
629 disk_debug(1, "disk_create (begin): %s%d\n", name, unit);
632 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
633 UID_ROOT, GID_OPERATOR, 0640, "%s", name);
635 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
636 UID_ROOT, GID_OPERATOR, 0640,
637 "%s%d", raw_ops->head.name, unit);
640 bzero(dp, sizeof(*dp));
642 dp->d_rawdev = rawdev;
643 dp->d_raw_ops = raw_ops;
644 dp->d_dev_ops = &disk_ops;
648 dp->d_cdev = make_only_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
649 dkmakewholedisk(unit), UID_ROOT, GID_OPERATOR, 0640,
652 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
653 dkmakewholedisk(unit), UID_ROOT, GID_OPERATOR, 0640,
658 dp->d_cdev = make_only_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
659 dkmakewholedisk(unit),
660 UID_ROOT, GID_OPERATOR, 0640,
661 "%s%d", raw_ops->head.name, unit);
663 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
664 dkmakewholedisk(unit),
665 UID_ROOT, GID_OPERATOR, 0640,
666 "%s%d", raw_ops->head.name, unit);
670 udev_dict_set_cstr(dp->d_cdev, "subsystem", "disk");
671 dp->d_cdev->si_disk = dp;
674 dsched_disk_create_callback(dp, name, unit);
676 dsched_disk_create_callback(dp, raw_ops->head.name, unit);
678 lwkt_gettoken(&disklist_token);
679 LIST_INSERT_HEAD(&disklist, dp, d_list);
680 lwkt_reltoken(&disklist_token);
682 disk_debug(1, "disk_create (end): %s%d\n",
683 (name != NULL)?(name):(raw_ops->head.name), unit);
685 return (dp->d_rawdev);
689 disk_setdisktype(struct disk *disk, const char *type)
691 KKASSERT(disk != NULL);
693 disk->d_disktype = type;
694 return udev_dict_set_cstr(disk->d_cdev, "disk-type", __DECONST(char *, type));
698 disk_getopencount(struct disk *disk)
700 return disk->d_opencount;
704 _setdiskinfo(struct disk *disk, struct disk_info *info)
708 oldserialno = disk->d_info.d_serialno;
709 bcopy(info, &disk->d_info, sizeof(disk->d_info));
710 info = &disk->d_info;
713 "_setdiskinfo: %s\n",
714 disk->d_cdev->si_name);
717 * The serial number is duplicated so the caller can throw
720 if (info->d_serialno && info->d_serialno[0] &&
721 (info->d_serialno[0] != ' ' || strlen(info->d_serialno) > 1)) {
722 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
723 disk_cleanserial(info->d_serialno);
725 make_dev_alias(disk->d_cdev, "serno/%s",
729 info->d_serialno = NULL;
732 kfree(oldserialno, M_TEMP);
734 dsched_disk_update_callback(disk, info);
737 * The caller may set d_media_size or d_media_blocks and we
738 * calculate the other.
740 KKASSERT(info->d_media_size == 0 || info->d_media_blocks == 0);
741 if (info->d_media_size == 0 && info->d_media_blocks) {
742 info->d_media_size = (u_int64_t)info->d_media_blocks *
743 info->d_media_blksize;
744 } else if (info->d_media_size && info->d_media_blocks == 0 &&
745 info->d_media_blksize) {
746 info->d_media_blocks = info->d_media_size /
747 info->d_media_blksize;
751 * The si_* fields for rawdev are not set until after the
752 * disk_create() call, so someone using the cooked version
753 * of the raw device (i.e. da0s0) will not get the right
754 * si_iosize_max unless we fix it up here.
756 if (disk->d_cdev && disk->d_rawdev &&
757 disk->d_cdev->si_iosize_max == 0) {
758 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
759 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
760 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
763 /* Add the serial number to the udev_dictionary */
764 if (info->d_serialno)
765 udev_dict_set_cstr(disk->d_cdev, "serno", info->d_serialno);
769 * Disk drivers must call this routine when media parameters are available
773 disk_setdiskinfo(struct disk *disk, struct disk_info *info)
775 _setdiskinfo(disk, info);
776 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
778 "disk_setdiskinfo: sent probe for %s\n",
779 disk->d_cdev->si_name);
783 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
785 _setdiskinfo(disk, info);
786 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
788 "disk_setdiskinfo_sync: sent probe for %s\n",
789 disk->d_cdev->si_name);
793 * This routine is called when an adapter detaches. The higher level
794 * managed disk device is destroyed while the lower level raw device is
798 disk_destroy(struct disk *disk)
800 dsched_disk_destroy_callback(disk);
801 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
806 disk_dumpcheck(cdev_t dev, u_int64_t *size, u_int64_t *blkno, u_int32_t *secsize)
808 struct partinfo pinfo;
811 bzero(&pinfo, sizeof(pinfo));
812 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0,
813 proc0.p_ucred, NULL);
817 if (pinfo.media_blksize == 0)
820 if (blkno) /* XXX: make sure this reserved stuff is right */
821 *blkno = pinfo.reserved_blocks +
822 pinfo.media_offset / pinfo.media_blksize;
824 *secsize = pinfo.media_blksize;
826 *size = (pinfo.media_blocks - pinfo.reserved_blocks);
832 disk_dumpconf(cdev_t dev, u_int onoff)
834 struct dumperinfo di;
835 u_int64_t size, blkno;
840 return set_dumper(NULL);
842 error = disk_dumpcheck(dev, &size, &blkno, &secsize);
847 bzero(&di, sizeof(struct dumperinfo));
848 di.dumper = diskdump;
850 di.blocksize = secsize;
851 di.mediaoffset = blkno * DEV_BSIZE;
852 di.mediasize = size * DEV_BSIZE;
854 return set_dumper(&di);
858 disk_unprobe(struct disk *disk)
863 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
867 disk_invalidate (struct disk *disk)
869 dsgone(&disk->d_slice);
873 disk_enumerate(struct disk *disk)
877 lwkt_gettoken(&disklist_token);
879 dp = (LIST_FIRST(&disklist));
881 dp = (LIST_NEXT(disk, d_list));
882 lwkt_reltoken(&disklist_token);
889 sysctl_disks(SYSCTL_HANDLER_ARGS)
897 while ((disk = disk_enumerate(disk))) {
899 error = SYSCTL_OUT(req, " ", 1);
905 error = SYSCTL_OUT(req, disk->d_rawdev->si_name,
906 strlen(disk->d_rawdev->si_name));
910 error = SYSCTL_OUT(req, "", 1);
914 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
915 sysctl_disks, "A", "names of available disks");
918 * Open a disk device or partition.
922 diskopen(struct dev_open_args *ap)
924 cdev_t dev = ap->a_head.a_dev;
929 * dp can't be NULL here XXX.
931 * d_slice will be NULL if setdiskinfo() has not been called yet.
932 * setdiskinfo() is typically called whether the disk is present
933 * or not (e.g. CD), but the base disk device is created first
934 * and there may be a race.
937 if (dp == NULL || dp->d_slice == NULL)
942 * Deal with open races
945 while (dp->d_flags & DISKFLAG_LOCK) {
946 dp->d_flags |= DISKFLAG_WANTED;
947 error = tsleep(dp, PCATCH, "diskopen", hz);
953 dp->d_flags |= DISKFLAG_LOCK;
956 * Open the underlying raw device.
958 if (!dsisopen(dp->d_slice)) {
960 if (!pdev->si_iosize_max)
961 pdev->si_iosize_max = dev->si_iosize_max;
963 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
964 ap->a_devtype, ap->a_cred);
969 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
970 &dp->d_slice, &dp->d_info);
971 if (!dsisopen(dp->d_slice)) {
972 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype);
975 dp->d_flags &= ~DISKFLAG_LOCK;
976 if (dp->d_flags & DISKFLAG_WANTED) {
977 dp->d_flags &= ~DISKFLAG_WANTED;
982 KKASSERT(dp->d_opencount >= 0);
983 /* If the open was successful, bump open count */
985 atomic_add_int(&dp->d_opencount, 1);
991 * Close a disk device or partition
995 diskclose(struct dev_close_args *ap)
997 cdev_t dev = ap->a_head.a_dev;
1006 * The cdev_t represents the disk/slice/part. The shared
1007 * dp structure governs all cdevs associated with the disk.
1009 * As a safety only close the underlying raw device on the last
1010 * close the disk device if our tracking of the slices/partitions
1011 * also indicates nothing is open.
1013 KKASSERT(dp->d_opencount >= 1);
1014 lcount = atomic_fetchadd_int(&dp->d_opencount, -1);
1017 dsclose(dev, ap->a_devtype, dp->d_slice);
1018 if (lcount <= 1 && !dsisopen(dp->d_slice)) {
1019 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype);
1026 * First execute the ioctl on the disk device, and if it isn't supported
1027 * try running it on the backing device.
1031 diskioctl(struct dev_ioctl_args *ap)
1033 cdev_t dev = ap->a_head.a_dev;
1042 devfs_debug(DEVFS_DEBUG_DEBUG,
1043 "diskioctl: cmd is: %lx (name: %s)\n",
1044 ap->a_cmd, dev->si_name);
1045 devfs_debug(DEVFS_DEBUG_DEBUG,
1046 "diskioctl: &dp->d_slice is: %p, %p\n",
1047 &dp->d_slice, dp->d_slice);
1049 if (ap->a_cmd == DIOCGKERNELDUMP) {
1050 u = *(u_int *)ap->a_data;
1051 return disk_dumpconf(dev, u);
1054 if (&dp->d_slice == NULL || dp->d_slice == NULL ||
1055 ((dp->d_info.d_dsflags & DSO_DEVICEMAPPER) &&
1056 dkslice(dev) == WHOLE_DISK_SLICE)) {
1060 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
1061 &dp->d_slice, &dp->d_info);
1065 if (error == ENOIOCTL) {
1066 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
1067 ap->a_fflag, ap->a_cred, NULL);
1073 * Execute strategy routine
1077 diskstrategy(struct dev_strategy_args *ap)
1079 cdev_t dev = ap->a_head.a_dev;
1080 struct bio *bio = ap->a_bio;
1087 bio->bio_buf->b_error = ENXIO;
1088 bio->bio_buf->b_flags |= B_ERROR;
1092 KKASSERT(dev->si_disk == dp);
1095 * The dscheck() function will also transform the slice relative
1096 * block number i.e. bio->bio_offset into a block number that can be
1097 * passed directly to the underlying raw device. If dscheck()
1098 * returns NULL it will have handled the bio for us (e.g. EOF
1099 * or error due to being beyond the device size).
1101 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
1102 dsched_queue(dp, nbio);
1110 * Return the partition size in ?blocks?
1114 diskpsize(struct dev_psize_args *ap)
1116 cdev_t dev = ap->a_head.a_dev;
1123 ap->a_result = dssize(dev, &dp->d_slice);
1125 if ((ap->a_result == -1) &&
1126 (dp->d_info.d_dsflags & DSO_RAWPSIZE)) {
1127 ap->a_head.a_dev = dp->d_rawdev;
1128 return dev_doperate(&ap->a_head);
1134 diskdump(struct dev_dump_args *ap)
1136 cdev_t dev = ap->a_head.a_dev;
1137 struct disk *dp = dev->si_disk;
1138 u_int64_t size, offset;
1141 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize);
1142 /* XXX: this should probably go in disk_dumpcheck somehow */
1143 if (ap->a_length != 0) {
1145 offset = ap->a_blkno * DEV_BSIZE;
1146 if ((ap->a_offset < offset) ||
1147 (ap->a_offset + ap->a_length - offset > size)) {
1148 kprintf("Attempt to write outside dump device boundaries.\n");
1154 ap->a_head.a_dev = dp->d_rawdev;
1155 error = dev_doperate(&ap->a_head);
1162 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
1163 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
1165 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
1166 0, sizeof(struct disk), "sizeof(struct disk)");
1169 * Reorder interval for burst write allowance and minor write
1172 * We always want to trickle some writes in to make use of the
1173 * disk's zone cache. Bursting occurs on a longer interval and only
1174 * runningbufspace is well over the hirunningspace limit.
1176 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */
1177 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval,
1178 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, "");
1179 int bioq_reorder_minor_interval = 5;
1180 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval,
1181 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, "");
1183 int bioq_reorder_burst_bytes = 3000000;
1184 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes,
1185 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, "");
1186 int bioq_reorder_minor_bytes = 262144;
1187 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes,
1188 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, "");
1192 * Order I/Os. Generally speaking this code is designed to make better
1193 * use of drive zone caches. A drive zone cache can typically track linear
1194 * reads or writes for around 16 zones simultaniously.
1196 * Read prioritization issues: It is possible for hundreds of megabytes worth
1197 * of writes to be queued asynchronously. This creates a huge bottleneck
1198 * for reads which reduce read bandwidth to a trickle.
1200 * To solve this problem we generally reorder reads before writes.
1202 * However, a large number of random reads can also starve writes and
1203 * make poor use of the drive zone cache so we allow writes to trickle
1207 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
1210 * The BIO wants to be ordered. Adding to the tail also
1211 * causes transition to be set to NULL, forcing the ordering
1212 * of all prior I/O's.
1214 if (bio->bio_buf->b_flags & B_ORDERED) {
1215 bioq_insert_tail(bioq, bio);
1219 switch(bio->bio_buf->b_cmd) {
1221 if (bioq->transition) {
1223 * Insert before the first write. Bleedover writes
1224 * based on reorder intervals to prevent starvation.
1226 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act);
1228 if (bioq->reorder % bioq_reorder_minor_interval == 0) {
1229 bioqwritereorder(bioq);
1230 if (bioq->reorder >=
1231 bioq_reorder_burst_interval) {
1237 * No writes queued (or ordering was forced),
1240 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1245 * Writes are always appended. If no writes were previously
1246 * queued or an ordered tail insertion occured the transition
1247 * field will be NULL.
1249 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1250 if (bioq->transition == NULL)
1251 bioq->transition = bio;
1255 * All other request types are forced to be ordered.
1257 bioq_insert_tail(bioq, bio);
1263 * Move the read-write transition point to prevent reads from
1264 * completely starving our writes. This brings a number of writes into
1265 * the fold every N reads.
1267 * We bring a few linear writes into the fold on a minor interval
1268 * and we bring a non-linear burst of writes into the fold on a major
1269 * interval. Bursting only occurs if runningbufspace is really high
1270 * (typically from syncs, fsyncs, or HAMMER flushes).
1274 bioqwritereorder(struct bio_queue_head *bioq)
1282 if (bioq->reorder < bioq_reorder_burst_interval ||
1283 !buf_runningbufspace_severe()) {
1284 left = (size_t)bioq_reorder_minor_bytes;
1287 left = (size_t)bioq_reorder_burst_bytes;
1291 next_offset = bioq->transition->bio_offset;
1292 while ((bio = bioq->transition) != NULL &&
1293 (check_off == 0 || next_offset == bio->bio_offset)
1295 n = bio->bio_buf->b_bcount;
1296 next_offset = bio->bio_offset + n;
1297 bioq->transition = TAILQ_NEXT(bio, bio_act);
1305 * Bounds checking against the media size, used for the raw partition.
1306 * secsize, mediasize and b_blkno must all be the same units.
1307 * Possibly this has to be DEV_BSIZE (512).
1310 bounds_check_with_mediasize(struct bio *bio, int secsize, uint64_t mediasize)
1312 struct buf *bp = bio->bio_buf;
1315 sz = howmany(bp->b_bcount, secsize);
1317 if (bio->bio_offset/DEV_BSIZE + sz > mediasize) {
1318 sz = mediasize - bio->bio_offset/DEV_BSIZE;
1320 /* If exactly at end of disk, return EOF. */
1321 bp->b_resid = bp->b_bcount;
1325 /* If past end of disk, return EINVAL. */
1326 bp->b_error = EINVAL;
1329 /* Otherwise, truncate request. */
1330 bp->b_bcount = sz * secsize;
1337 * Disk error is the preface to plaintive error messages
1338 * about failing disk transfers. It prints messages of the form
1340 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1342 * if the offset of the error in the transfer and a disk label
1343 * are both available. blkdone should be -1 if the position of the error
1344 * is unknown; the disklabel pointer may be null from drivers that have not
1345 * been converted to use them. The message is printed with kprintf
1346 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1347 * The message should be completed (with at least a newline) with kprintf
1348 * or log(-1, ...), respectively. There is no trailing space.
1351 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
1353 struct buf *bp = bio->bio_buf;
1367 kprintf("%s: %s %sing ", dev->si_name, what, term);
1368 kprintf("offset %012llx for %d",
1369 (long long)bio->bio_offset,
1373 kprintf(" (%d bytes completed)", donecnt);
1377 * Locate a disk device
1380 disk_locate(const char *devname)
1382 return devfs_find_device_by_name(devname);
1386 disk_config(void *arg)
1388 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
1394 struct thread* td_core;
1396 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1398 objcache_malloc_alloc,
1399 objcache_malloc_free,
1400 &disk_msg_malloc_args);
1402 lwkt_token_init(&disklist_token, "disks");
1405 * Initialize the reply-only port which acts as a message drain
1407 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1409 lwkt_gettoken(&disklist_token);
1410 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1411 0, -1, "disk_msg_core");
1412 tsleep(td_core, 0, "diskcore", 0);
1413 lwkt_reltoken(&disklist_token);
1419 objcache_destroy(disk_msg_cache);
1423 * Clean out illegal characters in serial numbers.
1426 disk_cleanserial(char *serno)
1430 while ((c = *serno) != 0) {
1431 if (c >= 'a' && c <= 'z')
1433 else if (c >= 'A' && c <= 'Z')
1435 else if (c >= '0' && c <= '9')
1437 else if (c == '-' || c == '@' || c == '+' || c == '.')
1445 TUNABLE_INT("kern.disk_debug", &disk_debug_enable);
1446 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable,
1447 0, "Enable subr_disk debugging");
1449 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1450 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);