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>
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8 * modification, are permitted provided that the following conditions
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
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37 * can do whatever you want with this stuff. If we meet some day, and you think
38 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
77 * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
78 * $FreeBSD: src/sys/kern/subr_disk.c,v 1.20.2.6 2001/10/05 07:14:57 peter Exp $
79 * $FreeBSD: src/sys/ufs/ufs/ufs_disksubr.c,v 1.44.2.3 2001/03/05 05:42:19 obrien Exp $
80 * $DragonFly: src/sys/kern/subr_disk.c,v 1.40 2008/06/05 18:06:32 swildner 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 <sys/sysctl.h>
99 #include <machine/md_var.h>
100 #include <sys/ctype.h>
101 #include <sys/syslog.h>
102 #include <sys/device.h>
103 #include <sys/msgport.h>
104 #include <sys/devfs.h>
105 #include <sys/thread.h>
106 #include <sys/dsched.h>
107 #include <sys/queue.h>
108 #include <sys/lock.h>
109 #include <sys/udev.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);
127 static d_open_t diskopen;
128 static d_close_t diskclose;
129 static d_ioctl_t diskioctl;
130 static d_strategy_t diskstrategy;
131 static d_psize_t diskpsize;
132 static d_clone_t diskclone;
133 static d_dump_t diskdump;
135 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
136 static struct lwkt_token disklist_token;
138 static struct dev_ops disk_ops = {
139 { "disk", 0, D_DISK | D_MPSAFE },
141 .d_close = diskclose,
143 .d_write = physwrite,
144 .d_ioctl = diskioctl,
145 .d_strategy = diskstrategy,
147 .d_psize = diskpsize,
151 static struct objcache *disk_msg_cache;
153 struct objcache_malloc_args disk_msg_malloc_args = {
154 sizeof(struct disk_msg), M_DISK };
156 static struct lwkt_port disk_dispose_port;
157 static struct lwkt_port disk_msg_port;
160 disk_debug(int level, char *fmt, ...)
165 if (level <= disk_debug_enable)
173 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
175 struct disk_info *info = &dp->d_info;
176 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
178 struct partinfo part;
185 "disk_probe_slice (begin): %s (%s)\n",
186 dev->si_name, dp->d_cdev->si_name);
188 sno = slice ? slice - 1 : 0;
190 ops = &disklabel32_ops;
191 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
192 if (msg && !strcmp(msg, "no disk label")) {
193 ops = &disklabel64_ops;
194 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
197 if (slice != WHOLE_DISK_SLICE)
198 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
203 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
204 ops->op_loadpartinfo(sp->ds_label, i, &part);
207 (ndev = devfs_find_device_by_name("%s%c",
208 dev->si_name, 'a' + i))
211 * Device already exists and
214 ndev->si_flags |= SI_REPROBE_TEST;
216 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
217 dkmakeminor(dkunit(dp->d_cdev),
219 UID_ROOT, GID_OPERATOR, 0640,
220 "%s%c", dev->si_name, 'a'+ i);
222 udev_dict_set_cstr(ndev, "subsystem", "disk");
223 /* Inherit parent's disk type */
224 if (dp->d_disktype) {
225 udev_dict_set_cstr(ndev, "disk-type",
226 __DECONST(char *, dp->d_disktype));
228 if (dp->d_info.d_serialno) {
231 dp->d_info.d_serialno,
234 ndev->si_flags |= SI_REPROBE_TEST;
238 } else if (info->d_dsflags & DSO_COMPATLABEL) {
240 if (sp->ds_size >= 0x100000000ULL)
241 ops = &disklabel64_ops;
243 ops = &disklabel32_ops;
244 sp->ds_label = ops->op_clone_label(info, sp);
246 if (sp->ds_type == DOSPTYP_386BSD || /* XXX */
247 sp->ds_type == DOSPTYP_NETBSD ||
248 sp->ds_type == DOSPTYP_OPENBSD) {
249 log(LOG_WARNING, "%s: cannot find label (%s)\n",
255 sp->ds_wlabel = FALSE;
258 return (msg ? EINVAL : 0);
262 * This routine is only called for newly minted drives or to reprobe
263 * a drive with no open slices. disk_probe_slice() is called directly
264 * when reprobing partition changes within slices.
267 disk_probe(struct disk *dp, int reprobe)
269 struct disk_info *info = &dp->d_info;
270 cdev_t dev = dp->d_cdev;
273 struct diskslices *osp;
274 struct diskslice *sp;
276 KKASSERT (info->d_media_blksize != 0);
279 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
280 disk_debug(1, "disk_probe (begin): %s\n", dp->d_cdev->si_name);
282 error = mbrinit(dev, info, &(dp->d_slice));
288 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
290 * Ignore the whole-disk slice, it has already been created.
292 if (i == WHOLE_DISK_SLICE)
294 sp = &dp->d_slice->dss_slices[i];
297 * Handle s0. s0 is a compatibility slice if there are no
298 * other slices and it has not otherwise been set up, else
301 if (i == COMPATIBILITY_SLICE) {
303 if (sp->ds_type == 0 &&
304 dp->d_slice->dss_nslices == BASE_SLICE) {
305 sp->ds_size = info->d_media_blocks;
314 * Ignore 0-length slices
316 if (sp->ds_size == 0)
320 (ndev = devfs_find_device_by_name("%ss%d",
321 dev->si_name, sno))) {
323 * Device already exists and is still valid
325 ndev->si_flags |= SI_REPROBE_TEST;
328 * Else create new device
330 ndev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
331 dkmakewholeslice(dkunit(dev), i),
332 UID_ROOT, GID_OPERATOR, 0640,
333 "%ss%d", dev->si_name, sno);
334 udev_dict_set_cstr(ndev, "subsystem", "disk");
335 /* Inherit parent's disk type */
336 if (dp->d_disktype) {
337 udev_dict_set_cstr(ndev, "disk-type",
338 __DECONST(char *, dp->d_disktype));
340 if (dp->d_info.d_serialno) {
341 make_dev_alias(ndev, "serno/%s.s%d",
342 dp->d_info.d_serialno, sno);
345 ndev->si_flags |= SI_REPROBE_TEST;
350 * Probe appropriate slices for a disklabel
352 * XXX slice type 1 used by our gpt probe code.
353 * XXX slice type 0 used by mbr compat slice.
355 if (sp->ds_type == DOSPTYP_386BSD ||
356 sp->ds_type == DOSPTYP_NETBSD ||
357 sp->ds_type == DOSPTYP_OPENBSD ||
360 if (dp->d_slice->dss_first_bsd_slice == 0)
361 dp->d_slice->dss_first_bsd_slice = i;
362 disk_probe_slice(dp, ndev, i, reprobe);
366 disk_debug(1, "disk_probe (end): %s\n", dp->d_cdev->si_name);
371 disk_msg_core(void *arg)
374 struct diskslice *sp;
378 lwkt_gettoken(&disklist_token);
379 lwkt_initport_thread(&disk_msg_port, curthread);
380 wakeup(curthread); /* synchronous startup */
381 lwkt_reltoken(&disklist_token);
383 get_mplock(); /* not mpsafe yet? */
387 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
389 switch (msg->hdr.u.ms_result) {
390 case DISK_DISK_PROBE:
391 dp = (struct disk *)msg->load;
393 "DISK_DISK_PROBE: %s\n",
394 dp->d_cdev->si_name);
397 case DISK_DISK_DESTROY:
398 dp = (struct disk *)msg->load;
400 "DISK_DISK_DESTROY: %s\n",
401 dp->d_cdev->si_name);
402 devfs_destroy_subnames(dp->d_cdev->si_name);
403 devfs_destroy_dev(dp->d_cdev);
404 lwkt_gettoken(&disklist_token);
405 LIST_REMOVE(dp, d_list);
406 lwkt_reltoken(&disklist_token);
407 if (dp->d_info.d_serialno) {
408 kfree(dp->d_info.d_serialno, M_TEMP);
409 dp->d_info.d_serialno = NULL;
413 dp = (struct disk *)msg->load;
415 "DISK_DISK_UNPROBE: %s\n",
416 dp->d_cdev->si_name);
417 devfs_destroy_subnames(dp->d_cdev->si_name);
419 case DISK_SLICE_REPROBE:
420 dp = (struct disk *)msg->load;
421 sp = (struct diskslice *)msg->load2;
422 devfs_clr_subnames_flag(sp->ds_dev->si_name,
425 "DISK_SLICE_REPROBE: %s\n",
426 sp->ds_dev->si_name);
427 disk_probe_slice(dp, sp->ds_dev,
428 dkslice(sp->ds_dev), 1);
429 devfs_destroy_subnames_without_flag(
430 sp->ds_dev->si_name, SI_REPROBE_TEST);
432 case DISK_DISK_REPROBE:
433 dp = (struct disk *)msg->load;
434 devfs_clr_subnames_flag(dp->d_cdev->si_name, SI_REPROBE_TEST);
436 "DISK_DISK_REPROBE: %s\n",
437 dp->d_cdev->si_name);
439 devfs_destroy_subnames_without_flag(
440 dp->d_cdev->si_name, SI_REPROBE_TEST);
443 disk_debug(1, "DISK_SYNC\n");
446 devfs_debug(DEVFS_DEBUG_WARNING,
447 "disk_msg_core: unknown message "
448 "received at core\n");
451 lwkt_replymsg(&msg->hdr, 0);
458 * Acts as a message drain. Any message that is replied to here gets
459 * destroyed and the memory freed.
462 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
464 objcache_put(disk_msg_cache, msg);
469 disk_msg_send(uint32_t cmd, void *load, void *load2)
472 lwkt_port_t port = &disk_msg_port;
474 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
476 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
478 disk_msg->hdr.u.ms_result = cmd;
479 disk_msg->load = load;
480 disk_msg->load2 = load2;
482 lwkt_sendmsg(port, &disk_msg->hdr);
486 disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
488 struct lwkt_port rep_port;
492 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
493 port = &disk_msg_port;
495 /* XXX could probably use curthread's built-in msgport */
496 lwkt_initport_thread(&rep_port, curthread);
497 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
499 disk_msg->hdr.u.ms_result = cmd;
500 disk_msg->load = load;
501 disk_msg->load2 = load2;
503 lwkt_sendmsg(port, &disk_msg->hdr);
504 lwkt_waitmsg(&disk_msg->hdr, 0);
505 objcache_put(disk_msg_cache, disk_msg);
509 * Create a raw device for the dev_ops template (which is returned). Also
510 * create a slice and unit managed disk and overload the user visible
511 * device space with it.
513 * NOTE: The returned raw device is NOT a slice and unit managed device.
514 * It is an actual raw device representing the raw disk as specified by
515 * the passed dev_ops. The disk layer not only returns such a raw device,
516 * it also uses it internally when passing (modified) commands through.
519 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
521 return disk_create_named(NULL, unit, dp, raw_ops);
525 disk_create_named(const char *name, int unit, struct disk *dp, struct dev_ops *raw_ops)
530 name = raw_ops->head.name;
532 disk_debug(1, "disk_create (begin): %s%d\n", name, unit);
534 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
535 UID_ROOT, GID_OPERATOR, 0640,
538 bzero(dp, sizeof(*dp));
540 dp->d_rawdev = rawdev;
541 dp->d_raw_ops = raw_ops;
542 dp->d_dev_ops = &disk_ops;
543 dp->d_cdev = make_dev_covering(&disk_ops, dp->d_rawdev->si_ops,
544 dkmakewholedisk(unit),
545 UID_ROOT, GID_OPERATOR, 0640,
547 udev_dict_set_cstr(dp->d_cdev, "subsystem", "disk");
548 dp->d_cdev->si_disk = dp;
550 dsched_disk_create_callback(dp, name, unit);
552 lwkt_gettoken(&disklist_token);
553 LIST_INSERT_HEAD(&disklist, dp, d_list);
554 lwkt_reltoken(&disklist_token);
556 disk_debug(1, "disk_create (end): %s%d\n", name, unit);
558 return (dp->d_rawdev);
562 disk_setdisktype(struct disk *disk, const char *type)
564 KKASSERT(disk != NULL);
566 disk->d_disktype = type;
567 return udev_dict_set_cstr(disk->d_cdev, "disk-type", __DECONST(char *, type));
571 _setdiskinfo(struct disk *disk, struct disk_info *info)
575 oldserialno = disk->d_info.d_serialno;
576 bcopy(info, &disk->d_info, sizeof(disk->d_info));
577 info = &disk->d_info;
580 "_setdiskinfo: %s\n",
581 disk->d_cdev->si_name);
584 * The serial number is duplicated so the caller can throw
587 if (info->d_serialno && info->d_serialno[0]) {
588 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
589 disk_cleanserial(info->d_serialno);
591 make_dev_alias(disk->d_cdev, "serno/%s",
595 info->d_serialno = NULL;
598 kfree(oldserialno, M_TEMP);
600 dsched_disk_update_callback(disk, info);
603 * The caller may set d_media_size or d_media_blocks and we
604 * calculate the other.
606 KKASSERT(info->d_media_size == 0 || info->d_media_blksize == 0);
607 if (info->d_media_size == 0 && info->d_media_blocks) {
608 info->d_media_size = (u_int64_t)info->d_media_blocks *
609 info->d_media_blksize;
610 } else if (info->d_media_size && info->d_media_blocks == 0 &&
611 info->d_media_blksize) {
612 info->d_media_blocks = info->d_media_size /
613 info->d_media_blksize;
617 * The si_* fields for rawdev are not set until after the
618 * disk_create() call, so someone using the cooked version
619 * of the raw device (i.e. da0s0) will not get the right
620 * si_iosize_max unless we fix it up here.
622 if (disk->d_cdev && disk->d_rawdev &&
623 disk->d_cdev->si_iosize_max == 0) {
624 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
625 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
626 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
629 /* Add the serial number to the udev_dictionary */
630 if (info->d_serialno)
631 udev_dict_set_cstr(disk->d_cdev, "serno", info->d_serialno);
635 * Disk drivers must call this routine when media parameters are available
639 disk_setdiskinfo(struct disk *disk, struct disk_info *info)
641 _setdiskinfo(disk, info);
642 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
644 "disk_setdiskinfo: sent probe for %s\n",
645 disk->d_cdev->si_name);
649 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
651 _setdiskinfo(disk, info);
652 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
654 "disk_setdiskinfo_sync: sent probe for %s\n",
655 disk->d_cdev->si_name);
659 * This routine is called when an adapter detaches. The higher level
660 * managed disk device is destroyed while the lower level raw device is
664 disk_destroy(struct disk *disk)
666 dsched_disk_destroy_callback(disk);
667 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
672 disk_dumpcheck(cdev_t dev, u_int64_t *size, u_int64_t *blkno, u_int32_t *secsize)
674 struct partinfo pinfo;
677 bzero(&pinfo, sizeof(pinfo));
678 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0,
679 proc0.p_ucred, NULL);
683 if (pinfo.media_blksize == 0)
686 if (blkno) /* XXX: make sure this reserved stuff is right */
687 *blkno = pinfo.reserved_blocks +
688 pinfo.media_offset / pinfo.media_blksize;
690 *secsize = pinfo.media_blksize;
692 *size = (pinfo.media_blocks - pinfo.reserved_blocks);
698 disk_dumpconf(cdev_t dev, u_int onoff)
700 struct dumperinfo di;
701 u_int64_t size, blkno;
706 return set_dumper(NULL);
708 error = disk_dumpcheck(dev, &size, &blkno, &secsize);
713 bzero(&di, sizeof(struct dumperinfo));
714 di.dumper = diskdump;
716 di.blocksize = secsize;
717 di.mediaoffset = blkno * DEV_BSIZE;
718 di.mediasize = size * DEV_BSIZE;
720 return set_dumper(&di);
724 disk_unprobe(struct disk *disk)
729 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
733 disk_invalidate (struct disk *disk)
735 dsgone(&disk->d_slice);
739 disk_enumerate(struct disk *disk)
743 lwkt_gettoken(&disklist_token);
745 dp = (LIST_FIRST(&disklist));
747 dp = (LIST_NEXT(disk, d_list));
748 lwkt_reltoken(&disklist_token);
755 sysctl_disks(SYSCTL_HANDLER_ARGS)
763 while ((disk = disk_enumerate(disk))) {
765 error = SYSCTL_OUT(req, " ", 1);
771 error = SYSCTL_OUT(req, disk->d_rawdev->si_name,
772 strlen(disk->d_rawdev->si_name));
776 error = SYSCTL_OUT(req, "", 1);
780 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
781 sysctl_disks, "A", "names of available disks");
784 * Open a disk device or partition.
788 diskopen(struct dev_open_args *ap)
790 cdev_t dev = ap->a_head.a_dev;
795 * dp can't be NULL here XXX.
797 * d_slice will be NULL if setdiskinfo() has not been called yet.
798 * setdiskinfo() is typically called whether the disk is present
799 * or not (e.g. CD), but the base disk device is created first
800 * and there may be a race.
803 if (dp == NULL || dp->d_slice == NULL)
808 * Deal with open races
811 while (dp->d_flags & DISKFLAG_LOCK) {
812 dp->d_flags |= DISKFLAG_WANTED;
813 error = tsleep(dp, PCATCH, "diskopen", hz);
819 dp->d_flags |= DISKFLAG_LOCK;
822 * Open the underlying raw device.
824 if (!dsisopen(dp->d_slice)) {
826 if (!pdev->si_iosize_max)
827 pdev->si_iosize_max = dev->si_iosize_max;
829 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
830 ap->a_devtype, ap->a_cred);
834 * Inherit properties from the underlying device now that it is
842 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
843 &dp->d_slice, &dp->d_info);
844 if (!dsisopen(dp->d_slice)) {
845 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype);
848 dp->d_flags &= ~DISKFLAG_LOCK;
849 if (dp->d_flags & DISKFLAG_WANTED) {
850 dp->d_flags &= ~DISKFLAG_WANTED;
859 * Close a disk device or partition
863 diskclose(struct dev_close_args *ap)
865 cdev_t dev = ap->a_head.a_dev;
873 dsclose(dev, ap->a_devtype, dp->d_slice);
874 if (!dsisopen(dp->d_slice)) {
875 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype);
882 * First execute the ioctl on the disk device, and if it isn't supported
883 * try running it on the backing device.
887 diskioctl(struct dev_ioctl_args *ap)
889 cdev_t dev = ap->a_head.a_dev;
898 devfs_debug(DEVFS_DEBUG_DEBUG,
899 "diskioctl: cmd is: %lx (name: %s)\n",
900 ap->a_cmd, dev->si_name);
901 devfs_debug(DEVFS_DEBUG_DEBUG,
902 "diskioctl: &dp->d_slice is: %p, %p\n",
903 &dp->d_slice, dp->d_slice);
905 if (ap->a_cmd == DIOCGKERNELDUMP) {
906 u = *(u_int *)ap->a_data;
907 return disk_dumpconf(dev, u);
910 if (&dp->d_slice == NULL || dp->d_slice == NULL) {
914 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
915 &dp->d_slice, &dp->d_info);
919 if (error == ENOIOCTL) {
920 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
921 ap->a_fflag, ap->a_cred, NULL);
927 * Execute strategy routine
931 diskstrategy(struct dev_strategy_args *ap)
933 cdev_t dev = ap->a_head.a_dev;
934 struct bio *bio = ap->a_bio;
941 bio->bio_buf->b_error = ENXIO;
942 bio->bio_buf->b_flags |= B_ERROR;
946 KKASSERT(dev->si_disk == dp);
949 * The dscheck() function will also transform the slice relative
950 * block number i.e. bio->bio_offset into a block number that can be
951 * passed directly to the underlying raw device. If dscheck()
952 * returns NULL it will have handled the bio for us (e.g. EOF
953 * or error due to being beyond the device size).
955 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
956 dsched_queue(dp, nbio);
964 * Return the partition size in ?blocks?
968 diskpsize(struct dev_psize_args *ap)
970 cdev_t dev = ap->a_head.a_dev;
976 ap->a_result = dssize(dev, &dp->d_slice);
981 * When new device entries are instantiated, make sure they inherit our
982 * si_disk structure and block and iosize limits from the raw device.
984 * This routine is always called synchronously in the context of the
987 * XXX The various io and block size constraints are not always initialized
988 * properly by devices.
992 diskclone(struct dev_clone_args *ap)
994 cdev_t dev = ap->a_head.a_dev;
998 KKASSERT(dp != NULL);
1000 dev->si_iosize_max = dp->d_rawdev->si_iosize_max;
1001 dev->si_bsize_phys = dp->d_rawdev->si_bsize_phys;
1002 dev->si_bsize_best = dp->d_rawdev->si_bsize_best;
1007 diskdump(struct dev_dump_args *ap)
1009 cdev_t dev = ap->a_head.a_dev;
1010 struct disk *dp = dev->si_disk;
1011 u_int64_t size, offset;
1014 error = disk_dumpcheck(dev, &size, &ap->a_blkno, &ap->a_secsize);
1015 /* XXX: this should probably go in disk_dumpcheck somehow */
1016 if (ap->a_length != 0) {
1018 offset = ap->a_blkno * DEV_BSIZE;
1019 if ((ap->a_offset < offset) ||
1020 (ap->a_offset + ap->a_length - offset > size)) {
1021 kprintf("Attempt to write outside dump device boundaries.\n");
1027 ap->a_head.a_dev = dp->d_rawdev;
1028 error = dev_doperate(&ap->a_head);
1035 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
1036 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
1038 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
1039 0, sizeof(struct disk), "sizeof(struct disk)");
1042 * Reorder interval for burst write allowance and minor write
1045 * We always want to trickle some writes in to make use of the
1046 * disk's zone cache. Bursting occurs on a longer interval and only
1047 * runningbufspace is well over the hirunningspace limit.
1049 int bioq_reorder_burst_interval = 60; /* should be multiple of minor */
1050 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_interval,
1051 CTLFLAG_RW, &bioq_reorder_burst_interval, 0, "");
1052 int bioq_reorder_minor_interval = 5;
1053 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_interval,
1054 CTLFLAG_RW, &bioq_reorder_minor_interval, 0, "");
1056 int bioq_reorder_burst_bytes = 3000000;
1057 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_burst_bytes,
1058 CTLFLAG_RW, &bioq_reorder_burst_bytes, 0, "");
1059 int bioq_reorder_minor_bytes = 262144;
1060 SYSCTL_INT(_kern, OID_AUTO, bioq_reorder_minor_bytes,
1061 CTLFLAG_RW, &bioq_reorder_minor_bytes, 0, "");
1065 * Order I/Os. Generally speaking this code is designed to make better
1066 * use of drive zone caches. A drive zone cache can typically track linear
1067 * reads or writes for around 16 zones simultaniously.
1069 * Read prioritization issues: It is possible for hundreds of megabytes worth
1070 * of writes to be queued asynchronously. This creates a huge bottleneck
1071 * for reads which reduce read bandwidth to a trickle.
1073 * To solve this problem we generally reorder reads before writes.
1075 * However, a large number of random reads can also starve writes and
1076 * make poor use of the drive zone cache so we allow writes to trickle
1080 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
1083 * The BIO wants to be ordered. Adding to the tail also
1084 * causes transition to be set to NULL, forcing the ordering
1085 * of all prior I/O's.
1087 if (bio->bio_buf->b_flags & B_ORDERED) {
1088 bioq_insert_tail(bioq, bio);
1092 switch(bio->bio_buf->b_cmd) {
1094 if (bioq->transition) {
1096 * Insert before the first write. Bleedover writes
1097 * based on reorder intervals to prevent starvation.
1099 TAILQ_INSERT_BEFORE(bioq->transition, bio, bio_act);
1101 if (bioq->reorder % bioq_reorder_minor_interval == 0) {
1102 bioqwritereorder(bioq);
1103 if (bioq->reorder >=
1104 bioq_reorder_burst_interval) {
1110 * No writes queued (or ordering was forced),
1113 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1118 * Writes are always appended. If no writes were previously
1119 * queued or an ordered tail insertion occured the transition
1120 * field will be NULL.
1122 TAILQ_INSERT_TAIL(&bioq->queue, bio, bio_act);
1123 if (bioq->transition == NULL)
1124 bioq->transition = bio;
1128 * All other request types are forced to be ordered.
1130 bioq_insert_tail(bioq, bio);
1136 * Move the read-write transition point to prevent reads from
1137 * completely starving our writes. This brings a number of writes into
1138 * the fold every N reads.
1140 * We bring a few linear writes into the fold on a minor interval
1141 * and we bring a non-linear burst of writes into the fold on a major
1142 * interval. Bursting only occurs if runningbufspace is really high
1143 * (typically from syncs, fsyncs, or HAMMER flushes).
1147 bioqwritereorder(struct bio_queue_head *bioq)
1155 if (bioq->reorder < bioq_reorder_burst_interval ||
1156 !buf_runningbufspace_severe()) {
1157 left = (size_t)bioq_reorder_minor_bytes;
1160 left = (size_t)bioq_reorder_burst_bytes;
1164 next_offset = bioq->transition->bio_offset;
1165 while ((bio = bioq->transition) != NULL &&
1166 (check_off == 0 || next_offset == bio->bio_offset)
1168 n = bio->bio_buf->b_bcount;
1169 next_offset = bio->bio_offset + n;
1170 bioq->transition = TAILQ_NEXT(bio, bio_act);
1178 * Bounds checking against the media size, used for the raw partition.
1179 * secsize, mediasize and b_blkno must all be the same units.
1180 * Possibly this has to be DEV_BSIZE (512).
1183 bounds_check_with_mediasize(struct bio *bio, int secsize, uint64_t mediasize)
1185 struct buf *bp = bio->bio_buf;
1188 sz = howmany(bp->b_bcount, secsize);
1190 if (bio->bio_offset/DEV_BSIZE + sz > mediasize) {
1191 sz = mediasize - bio->bio_offset/DEV_BSIZE;
1193 /* If exactly at end of disk, return EOF. */
1194 bp->b_resid = bp->b_bcount;
1198 /* If past end of disk, return EINVAL. */
1199 bp->b_error = EINVAL;
1202 /* Otherwise, truncate request. */
1203 bp->b_bcount = sz * secsize;
1210 * Disk error is the preface to plaintive error messages
1211 * about failing disk transfers. It prints messages of the form
1213 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
1215 * if the offset of the error in the transfer and a disk label
1216 * are both available. blkdone should be -1 if the position of the error
1217 * is unknown; the disklabel pointer may be null from drivers that have not
1218 * been converted to use them. The message is printed with kprintf
1219 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1220 * The message should be completed (with at least a newline) with kprintf
1221 * or log(-1, ...), respectively. There is no trailing space.
1224 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
1226 struct buf *bp = bio->bio_buf;
1240 kprintf("%s: %s %sing ", dev->si_name, what, term);
1241 kprintf("offset %012llx for %d",
1242 (long long)bio->bio_offset,
1246 kprintf(" (%d bytes completed)", donecnt);
1250 * Locate a disk device
1253 disk_locate(const char *devname)
1255 return devfs_find_device_by_name(devname);
1259 disk_config(void *arg)
1261 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
1267 struct thread* td_core;
1269 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1271 objcache_malloc_alloc,
1272 objcache_malloc_free,
1273 &disk_msg_malloc_args);
1275 lwkt_token_init(&disklist_token, 1, "disks");
1278 * Initialize the reply-only port which acts as a message drain
1280 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1282 lwkt_gettoken(&disklist_token);
1283 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1284 TDF_MPSAFE, 0, "disk_msg_core");
1285 tsleep(td_core, 0, "diskcore", 0);
1286 lwkt_reltoken(&disklist_token);
1292 objcache_destroy(disk_msg_cache);
1296 * Clean out illegal characters in serial numbers.
1299 disk_cleanserial(char *serno)
1303 while ((c = *serno) != 0) {
1304 if (c >= 'a' && c <= 'z')
1306 else if (c >= 'A' && c <= 'Z')
1308 else if (c >= '0' && c <= '9')
1310 else if (c == '-' || c == '@' || c == '+' || c == '.')
1318 TUNABLE_INT("kern.disk_debug", &disk_debug_enable);
1319 SYSCTL_INT(_kern, OID_AUTO, disk_debug, CTLFLAG_RW, &disk_debug_enable,
1320 0, "Enable subr_disk debugging");
1322 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1323 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);