2 * Copyright (c) 2003,2004 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>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
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34 * ----------------------------------------------------------------------------
35 * "THE BEER-WARE LICENSE" (Revision 42):
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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
39 * ----------------------------------------------------------------------------
41 * Copyright (c) 1982, 1986, 1988, 1993
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71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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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/malloc.h>
97 #include <sys/sysctl.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/msgport2.h>
104 #include <sys/buf2.h>
105 #include <vfs/devfs/devfs.h>
106 #include <sys/thread.h>
107 #include <sys/thread2.h>
109 #include <sys/queue.h>
110 #include <sys/lock.h>
112 static MALLOC_DEFINE(M_DISK, "disk", "disk data");
114 static void disk_msg_autofree_reply(lwkt_port_t, lwkt_msg_t);
115 static void disk_msg_core(void *);
116 static int disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe);
117 static void disk_probe(struct disk *dp, int reprobe);
118 static void _setdiskinfo(struct disk *disk, struct disk_info *info);
120 static d_open_t diskopen;
121 static d_close_t diskclose;
122 static d_ioctl_t diskioctl;
123 static d_strategy_t diskstrategy;
124 static d_psize_t diskpsize;
125 static d_clone_t diskclone;
126 static d_dump_t diskdump;
128 static LIST_HEAD(, disk) disklist = LIST_HEAD_INITIALIZER(&disklist);
129 static struct lwkt_token disklist_token;
131 static struct dev_ops disk_ops = {
132 { "disk", 0, D_DISK },
134 .d_close = diskclose,
136 .d_write = physwrite,
137 .d_ioctl = diskioctl,
138 .d_strategy = diskstrategy,
140 .d_psize = diskpsize,
144 static struct objcache *disk_msg_cache;
146 struct objcache_malloc_args disk_msg_malloc_args = {
147 sizeof(struct disk_msg), M_DISK };
149 static struct lwkt_port disk_dispose_port;
150 static struct lwkt_port disk_msg_port;
154 disk_probe_slice(struct disk *dp, cdev_t dev, int slice, int reprobe)
156 struct disk_info *info = &dp->d_info;
157 struct diskslice *sp = &dp->d_slice->dss_slices[slice];
159 struct partinfo part;
166 ops = &disklabel32_ops;
167 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
168 if (msg && !strcmp(msg, "no disk label")) {
169 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: trying with disklabel64\n");
170 ops = &disklabel64_ops;
171 msg = ops->op_readdisklabel(dev, sp, &sp->ds_label, info);
173 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: label: %s\n", (msg)?msg:"is NULL");
175 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: found %d partitions in the label\n", ops->op_getnumparts(sp->ds_label));
176 if (slice != WHOLE_DISK_SLICE)
177 ops->op_adjust_label_reserved(dp->d_slice, slice, sp);
182 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: lp.opaque: %x\n", sp->ds_label.opaque);
183 for (i = 0; i < ops->op_getnumparts(sp->ds_label); i++) {
184 ops->op_loadpartinfo(sp->ds_label, i, &part);
185 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: partinfo says fstype=%d for part %d\n", part.fstype, i);
188 (ndev = devfs_find_device_by_name("%s%c",
189 dev->si_name, 'a'+ (char)i))) {
190 /* Device already exists and is still valid */
191 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice: reprobing and device remained valid, mark it\n");
192 ndev->si_flags |= SI_REPROBE_TEST;
194 ndev = make_dev(&disk_ops,
195 dkmakeminor(dkunit(dp->d_cdev), slice, i),
196 UID_ROOT, GID_OPERATOR, 0640,
197 "%s%c", dev->si_name, 'a'+ (char)i);
199 if (dp->d_info.d_serialno) {
200 make_dev_alias(ndev, "serno/%s.s%d%c", dp->d_info.d_serialno, slice - 1, 'a' + (char)i);
202 ndev->si_flags |= SI_REPROBE_TEST;
205 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_probe_slice:end: lp.opaque: %x\n", ndev->si_disk->d_slice->dss_slices[slice].ds_label.opaque);
208 } else if (info->d_dsflags & DSO_COMPATLABEL) {
210 if (sp->ds_size >= 0x100000000ULL)
211 ops = &disklabel64_ops;
213 ops = &disklabel32_ops;
214 sp->ds_label = ops->op_clone_label(info, sp);
216 if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
217 log(LOG_WARNING, "%s: cannot find label (%s)\n",
222 sp->ds_wlabel = FALSE;
225 return (msg ? EINVAL : 0);
230 disk_probe(struct disk *dp, int reprobe)
232 struct disk_info *info = &dp->d_info;
233 cdev_t dev = dp->d_cdev;
236 struct diskslice *sp;
238 KKASSERT (info->d_media_blksize != 0);
240 dp->d_slice = dsmakeslicestruct(BASE_SLICE, info);
242 error = mbrinit(dev, info, &(dp->d_slice));
246 for (i = 0; i < dp->d_slice->dss_nslices; i++) {
248 * Ignore the whole-disk slice, it has already been created.
250 if (i == WHOLE_DISK_SLICE)
252 sp = &dp->d_slice->dss_slices[i];
255 * Handle s0. s0 is a compatibility slice if there are no
256 * other slices and it has not otherwise been set up, else
259 if (i == COMPATIBILITY_SLICE) {
261 if (sp->ds_type == 0 &&
262 dp->d_slice->dss_nslices == BASE_SLICE) {
263 sp->ds_size = info->d_media_blocks;
272 * Ignore 0-length slices
274 if (sp->ds_size == 0)
278 (ndev = devfs_find_device_by_name("%ss%d",
279 dev->si_name, sno))) {
281 * Device already exists and is still valid
283 ndev->si_flags |= SI_REPROBE_TEST;
286 * Else create new device
288 ndev = make_dev(&disk_ops,
289 dkmakewholeslice(dkunit(dev), i),
290 UID_ROOT, GID_OPERATOR, 0640,
291 "%ss%d", dev->si_name, sno);
292 if (dp->d_info.d_serialno) {
293 make_dev_alias(ndev, "serno/%s.s%d",
294 dp->d_info.d_serialno, sno);
297 ndev->si_flags |= SI_REPROBE_TEST;
300 if (sp->ds_type == DOSPTYP_386BSD) {
301 if (dp->d_slice->dss_first_bsd_slice == 0)
302 dp->d_slice->dss_first_bsd_slice = i;
303 disk_probe_slice(dp, ndev, i, reprobe);
310 disk_msg_core(void *arg)
314 struct diskslice *sp;
318 lwkt_initport_thread(&disk_msg_port, curthread);
322 msg = (disk_msg_t)lwkt_waitport(&disk_msg_port, 0);
323 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_msg_core, new msg: %x\n", (unsigned int)msg->hdr.u.ms_result);
325 switch (msg->hdr.u.ms_result) {
327 case DISK_DISK_PROBE:
328 dp = (struct disk *)msg->load;
332 case DISK_DISK_DESTROY:
333 dp = (struct disk *)msg->load;
334 devfs_destroy_subnames(dp->d_cdev->si_name);
335 devfs_destroy_dev(dp->d_cdev);
336 lwkt_gettoken(&ilock, &disklist_token);
337 LIST_REMOVE(dp, d_list);
338 lwkt_reltoken(&ilock);
340 devfs_destroy_dev(dp->d_rawdev); /* XXX: needed? when? */
342 if (dp->d_info.d_serialno) {
343 kfree(dp->d_info.d_serialno, M_TEMP);
344 dp->d_info.d_serialno = NULL;
349 dp = (struct disk *)msg->load;
350 devfs_destroy_subnames(dp->d_cdev->si_name);
353 case DISK_SLICE_REPROBE:
354 dp = (struct disk *)msg->load;
355 sp = (struct diskslice *)msg->load2;
356 devfs_clr_subnames_flag(sp->ds_dev->si_name, SI_REPROBE_TEST);
357 devfs_debug(DEVFS_DEBUG_DEBUG,
358 "DISK_SLICE_REPROBE: %s\n",
359 sp->ds_dev->si_name);
360 disk_probe_slice(dp, sp->ds_dev, dkslice(sp->ds_dev), 1);
361 devfs_destroy_subnames_without_flag(sp->ds_dev->si_name,
365 case DISK_DISK_REPROBE:
366 dp = (struct disk *)msg->load;
367 devfs_clr_subnames_flag(dp->d_cdev->si_name, SI_REPROBE_TEST);
368 devfs_debug(DEVFS_DEBUG_DEBUG,
369 "DISK_DISK_REPROBE: %s\n",
370 dp->d_cdev->si_name);
372 devfs_destroy_subnames_without_flag(dp->d_cdev->si_name,
380 devfs_debug(DEVFS_DEBUG_WARNING, "disk_msg_core: unknown message received at core\n");
383 lwkt_replymsg((lwkt_msg_t)msg, 0);
390 * Acts as a message drain. Any message that is replied to here gets destroyed and
394 disk_msg_autofree_reply(lwkt_port_t port, lwkt_msg_t msg)
396 objcache_put(disk_msg_cache, msg);
401 disk_msg_send(uint32_t cmd, void *load, void *load2)
404 lwkt_port_t port = &disk_msg_port;
406 disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
408 lwkt_initmsg(&disk_msg->hdr, &disk_dispose_port, 0);
410 disk_msg->hdr.u.ms_result = cmd;
411 disk_msg->load = load;
412 disk_msg->load2 = load2;
414 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
418 disk_msg_send_sync(uint32_t cmd, void *load, void *load2)
420 struct lwkt_port rep_port;
421 disk_msg_t disk_msg = objcache_get(disk_msg_cache, M_WAITOK);
422 disk_msg_t msg_incoming;
423 lwkt_port_t port = &disk_msg_port;
425 lwkt_initport_thread(&rep_port, curthread);
426 lwkt_initmsg(&disk_msg->hdr, &rep_port, 0);
428 disk_msg->hdr.u.ms_result = cmd;
429 disk_msg->load = load;
430 disk_msg->load2 = load2;
433 lwkt_sendmsg(port, (lwkt_msg_t)disk_msg);
434 msg_incoming = lwkt_waitport(&rep_port, 0);
438 * Create a raw device for the dev_ops template (which is returned). Also
439 * create a slice and unit managed disk and overload the user visible
440 * device space with it.
442 * NOTE: The returned raw device is NOT a slice and unit managed device.
443 * It is an actual raw device representing the raw disk as specified by
444 * the passed dev_ops. The disk layer not only returns such a raw device,
445 * it also uses it internally when passing (modified) commands through.
448 disk_create(int unit, struct disk *dp, struct dev_ops *raw_ops)
453 rawdev = make_only_dev(raw_ops, dkmakewholedisk(unit),
454 UID_ROOT, GID_OPERATOR, 0640,
455 "%s%d", raw_ops->head.name, unit);
458 bzero(dp, sizeof(*dp));
460 dp->d_rawdev = rawdev;
461 dp->d_raw_ops = raw_ops;
462 dp->d_dev_ops = &disk_ops;
463 dp->d_cdev = make_dev(&disk_ops,
464 dkmakewholedisk(unit),
465 UID_ROOT, GID_OPERATOR, 0640,
466 "%s%d", raw_ops->head.name, unit);
468 dp->d_cdev->si_disk = dp;
470 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_create called for %s\n",
471 dp->d_cdev->si_name);
472 lwkt_gettoken(&ilock, &disklist_token);
473 LIST_INSERT_HEAD(&disklist, dp, d_list);
474 lwkt_reltoken(&ilock);
475 return (dp->d_rawdev);
480 _setdiskinfo(struct disk *disk, struct disk_info *info)
484 devfs_debug(DEVFS_DEBUG_DEBUG,
485 "_setdiskinfo called for disk -1-: %x\n", disk);
486 oldserialno = disk->d_info.d_serialno;
487 bcopy(info, &disk->d_info, sizeof(disk->d_info));
488 info = &disk->d_info;
491 * The serial number is duplicated so the caller can throw
494 if (info->d_serialno && info->d_serialno[0]) {
495 info->d_serialno = kstrdup(info->d_serialno, M_TEMP);
497 make_dev_alias(disk->d_cdev, "serno/%s",
501 info->d_serialno = NULL;
504 kfree(oldserialno, M_TEMP);
507 * The caller may set d_media_size or d_media_blocks and we
508 * calculate the other.
510 KKASSERT(info->d_media_size == 0 || info->d_media_blksize == 0);
511 if (info->d_media_size == 0 && info->d_media_blocks) {
512 info->d_media_size = (u_int64_t)info->d_media_blocks *
513 info->d_media_blksize;
514 } else if (info->d_media_size && info->d_media_blocks == 0 &&
515 info->d_media_blksize) {
516 info->d_media_blocks = info->d_media_size /
517 info->d_media_blksize;
521 * The si_* fields for rawdev are not set until after the
522 * disk_create() call, so someone using the cooked version
523 * of the raw device (i.e. da0s0) will not get the right
524 * si_iosize_max unless we fix it up here.
526 if (disk->d_cdev && disk->d_rawdev &&
527 disk->d_cdev->si_iosize_max == 0) {
528 disk->d_cdev->si_iosize_max = disk->d_rawdev->si_iosize_max;
529 disk->d_cdev->si_bsize_phys = disk->d_rawdev->si_bsize_phys;
530 disk->d_cdev->si_bsize_best = disk->d_rawdev->si_bsize_best;
535 * Disk drivers must call this routine when media parameters are available
539 disk_setdiskinfo(struct disk *disk, struct disk_info *info)
541 _setdiskinfo(disk, info);
542 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_setdiskinfo called for disk -2-: %x\n", disk);
543 disk_msg_send(DISK_DISK_PROBE, disk, NULL);
547 disk_setdiskinfo_sync(struct disk *disk, struct disk_info *info)
549 _setdiskinfo(disk, info);
550 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_setdiskinfo_sync called for disk -2-: %x\n", disk);
551 disk_msg_send_sync(DISK_DISK_PROBE, disk, NULL);
555 * This routine is called when an adapter detaches. The higher level
556 * managed disk device is destroyed while the lower level raw device is
560 disk_destroy(struct disk *disk)
562 disk_msg_send_sync(DISK_DISK_DESTROY, disk, NULL);
567 disk_dumpcheck(cdev_t dev, u_int64_t *count, u_int64_t *blkno, u_int *secsize)
569 struct partinfo pinfo;
572 bzero(&pinfo, sizeof(pinfo));
573 error = dev_dioctl(dev, DIOCGPART, (void *)&pinfo, 0, proc0.p_ucred);
576 if (pinfo.media_blksize == 0)
578 *count = (u_int64_t)Maxmem * PAGE_SIZE / pinfo.media_blksize;
579 if (dumplo64 < pinfo.reserved_blocks ||
580 dumplo64 + *count > pinfo.media_blocks) {
583 *blkno = dumplo64 + pinfo.media_offset / pinfo.media_blksize;
584 *secsize = pinfo.media_blksize;
589 disk_unprobe(struct disk *disk)
594 disk_msg_send_sync(DISK_UNPROBE, disk, NULL);
598 disk_invalidate (struct disk *disk)
600 devfs_debug(DEVFS_DEBUG_INFO, "disk_invalidate for %s\n", disk->d_cdev->si_name);
602 dsgone(&disk->d_slice);
606 disk_enumerate(struct disk *disk)
611 lwkt_gettoken(&ilock, &disklist_token);
613 dp = (LIST_FIRST(&disklist));
615 dp = (LIST_NEXT(disk, d_list));
616 lwkt_reltoken(&ilock);
623 sysctl_disks(SYSCTL_HANDLER_ARGS)
631 while ((disk = disk_enumerate(disk))) {
633 error = SYSCTL_OUT(req, " ", 1);
639 error = SYSCTL_OUT(req, disk->d_rawdev->si_name,
640 strlen(disk->d_rawdev->si_name));
644 error = SYSCTL_OUT(req, "", 1);
648 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
649 sysctl_disks, "A", "names of available disks");
652 * Open a disk device or partition.
656 diskopen(struct dev_open_args *ap)
658 cdev_t dev = ap->a_head.a_dev;
662 devfs_debug(DEVFS_DEBUG_DEBUG, "diskopen: name is %s\n", dev->si_name);
665 * dp can't be NULL here XXX.
673 * Deal with open races
675 while (dp->d_flags & DISKFLAG_LOCK) {
676 dp->d_flags |= DISKFLAG_WANTED;
677 error = tsleep(dp, PCATCH, "diskopen", hz);
681 dp->d_flags |= DISKFLAG_LOCK;
683 devfs_debug(DEVFS_DEBUG_DEBUG, "diskopen: -2- name is %s\n", dev->si_name);
686 * Open the underlying raw device.
688 if (!dsisopen(dp->d_slice)) {
690 if (!pdev->si_iosize_max)
691 pdev->si_iosize_max = dev->si_iosize_max;
693 error = dev_dopen(dp->d_rawdev, ap->a_oflags,
694 ap->a_devtype, ap->a_cred);
698 * Inherit properties from the underlying device now that it is
706 error = dsopen(dev, ap->a_devtype, dp->d_info.d_dsflags,
707 &dp->d_slice, &dp->d_info);
708 if (!dsisopen(dp->d_slice)) {
709 dev_dclose(dp->d_rawdev, ap->a_oflags, ap->a_devtype);
712 dp->d_flags &= ~DISKFLAG_LOCK;
713 if (dp->d_flags & DISKFLAG_WANTED) {
714 dp->d_flags &= ~DISKFLAG_WANTED;
722 * Close a disk device or partition
726 diskclose(struct dev_close_args *ap)
728 cdev_t dev = ap->a_head.a_dev;
735 devfs_debug(DEVFS_DEBUG_DEBUG, "diskclose: name %s\n", dev->si_name);
737 dsclose(dev, ap->a_devtype, dp->d_slice);
738 if (!dsisopen(dp->d_slice)) {
739 devfs_debug(DEVFS_DEBUG_DEBUG, "diskclose is closing underlying device\n");
740 error = dev_dclose(dp->d_rawdev, ap->a_fflag, ap->a_devtype);
746 * First execute the ioctl on the disk device, and if it isn't supported
747 * try running it on the backing device.
751 diskioctl(struct dev_ioctl_args *ap)
753 cdev_t dev = ap->a_head.a_dev;
761 devfs_debug(DEVFS_DEBUG_DEBUG, "diskioctl: cmd is: %x (name: %s)\n", ap->a_cmd, dev->si_name);
762 devfs_debug(DEVFS_DEBUG_DEBUG, "diskioctl: &dp->d_slice is: %x, %x\n", &dp->d_slice, dp->d_slice);
764 devfs_debug(DEVFS_DEBUG_DEBUG, "diskioctl:1: says lp.opaque is: %x\n", dp->d_slice->dss_slices[0].ds_label.opaque);
766 error = dsioctl(dev, ap->a_cmd, ap->a_data, ap->a_fflag,
767 &dp->d_slice, &dp->d_info);
769 devfs_debug(DEVFS_DEBUG_DEBUG, "diskioctl:2: says lp.opaque is: %x\n", dp->d_slice->dss_slices[0].ds_label.opaque);
771 if (error == ENOIOCTL) {
772 devfs_debug(DEVFS_DEBUG_DEBUG, "diskioctl: going for dev_dioctl instead!\n");
773 error = dev_dioctl(dp->d_rawdev, ap->a_cmd, ap->a_data,
774 ap->a_fflag, ap->a_cred);
780 * Execute strategy routine
784 diskstrategy(struct dev_strategy_args *ap)
786 cdev_t dev = ap->a_head.a_dev;
787 struct bio *bio = ap->a_bio;
794 bio->bio_buf->b_error = ENXIO;
795 bio->bio_buf->b_flags |= B_ERROR;
799 KKASSERT(dev->si_disk == dp);
802 * The dscheck() function will also transform the slice relative
803 * block number i.e. bio->bio_offset into a block number that can be
804 * passed directly to the underlying raw device. If dscheck()
805 * returns NULL it will have handled the bio for us (e.g. EOF
806 * or error due to being beyond the device size).
808 if ((nbio = dscheck(dev, bio, dp->d_slice)) != NULL) {
809 dev_dstrategy(dp->d_rawdev, nbio);
811 devfs_debug(DEVFS_DEBUG_DEBUG, "diskstrategy: dscheck NULL!!! biodone time!\n");
818 * Return the partition size in ?blocks?
822 diskpsize(struct dev_psize_args *ap)
824 cdev_t dev = ap->a_head.a_dev;
830 ap->a_result = dssize(dev, &dp->d_slice);
835 * When new device entries are instantiated, make sure they inherit our
836 * si_disk structure and block and iosize limits from the raw device.
838 * This routine is always called synchronously in the context of the
841 * XXX The various io and block size constraints are not always initialized
842 * properly by devices.
846 diskclone(struct dev_clone_args *ap)
848 cdev_t dev = ap->a_head.a_dev;
852 KKASSERT(dp != NULL);
854 dev->si_iosize_max = dp->d_rawdev->si_iosize_max;
855 dev->si_bsize_phys = dp->d_rawdev->si_bsize_phys;
856 dev->si_bsize_best = dp->d_rawdev->si_bsize_best;
861 diskdump(struct dev_dump_args *ap)
863 cdev_t dev = ap->a_head.a_dev;
864 struct disk *dp = dev->si_disk;
867 error = disk_dumpcheck(dev, &ap->a_count, &ap->a_blkno, &ap->a_secsize);
869 ap->a_head.a_dev = dp->d_rawdev;
870 error = dev_doperate(&ap->a_head);
877 SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
878 0, sizeof(struct diskslices), "sizeof(struct diskslices)");
880 SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
881 0, sizeof(struct disk), "sizeof(struct disk)");
885 * Seek sort for disks.
887 * The bio_queue keep two queues, sorted in ascending block order. The first
888 * queue holds those requests which are positioned after the current block
889 * (in the first request); the second, which starts at queue->switch_point,
890 * holds requests which came in after their block number was passed. Thus
891 * we implement a one way scan, retracting after reaching the end of the drive
892 * to the first request on the second queue, at which time it becomes the
895 * A one-way scan is natural because of the way UNIX read-ahead blocks are
899 bioqdisksort(struct bio_queue_head *bioq, struct bio *bio)
905 be = TAILQ_LAST(&bioq->queue, bio_queue);
907 * If the queue is empty or we are an
908 * ordered transaction, then it's easy.
910 if ((bq = bioq_first(bioq)) == NULL ||
911 (bio->bio_buf->b_flags & B_ORDERED) != 0) {
912 bioq_insert_tail(bioq, bio);
914 } else if (bioq->insert_point != NULL) {
917 * A certain portion of the list is
918 * "locked" to preserve ordering, so
919 * we can only insert after the insert
922 bq = bioq->insert_point;
926 * If we lie before the last removed (currently active)
927 * request, and are not inserting ourselves into the
928 * "locked" portion of the list, then we must add ourselves
929 * to the second request list.
931 if (bio->bio_offset < bioq->last_offset) {
932 bq = bioq->switch_point;
934 * If we are starting a new secondary list,
938 bioq->switch_point = bio;
939 bioq_insert_tail(bioq, bio);
943 * If we lie ahead of the current switch point,
944 * insert us before the switch point and move
947 if (bio->bio_offset < bq->bio_offset) {
948 bioq->switch_point = bio;
949 TAILQ_INSERT_BEFORE(bq, bio, bio_act);
953 if (bioq->switch_point != NULL)
954 be = TAILQ_PREV(bioq->switch_point,
957 * If we lie between last_offset and bq,
960 if (bio->bio_offset < bq->bio_offset) {
961 TAILQ_INSERT_BEFORE(bq, bio, bio_act);
968 * Request is at/after our current position in the list.
969 * Optimize for sequential I/O by seeing if we go at the tail.
971 if (bio->bio_offset > be->bio_offset) {
972 TAILQ_INSERT_AFTER(&bioq->queue, be, bio, bio_act);
976 /* Otherwise, insertion sort */
977 while ((bn = TAILQ_NEXT(bq, bio_act)) != NULL) {
980 * We want to go after the current request if it is the end
981 * of the first request list, or if the next request is a
982 * larger cylinder than our request.
984 if (bn == bioq->switch_point
985 || bio->bio_offset < bn->bio_offset)
989 TAILQ_INSERT_AFTER(&bioq->queue, bq, bio, bio_act);
993 * Disk error is the preface to plaintive error messages
994 * about failing disk transfers. It prints messages of the form
996 hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
998 * if the offset of the error in the transfer and a disk label
999 * are both available. blkdone should be -1 if the position of the error
1000 * is unknown; the disklabel pointer may be null from drivers that have not
1001 * been converted to use them. The message is printed with kprintf
1002 * if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
1003 * The message should be completed (with at least a newline) with kprintf
1004 * or log(-1, ...), respectively. There is no trailing space.
1007 diskerr(struct bio *bio, cdev_t dev, const char *what, int pri, int donecnt)
1009 struct buf *bp = bio->bio_buf;
1023 //sname = dsname(dev, unit, slice, part, partname);
1024 kprintf("%s: %s %sing ", dev->si_name, what, term);
1025 kprintf("offset %012llx for %d",
1026 (long long)bio->bio_offset,
1030 kprintf(" (%d bytes completed)", donecnt);
1034 * Locate a disk device
1037 disk_locate(const char *devname)
1039 return devfs_find_device_by_name(devname);
1044 disk_config(void *arg)
1046 disk_msg_send_sync(DISK_SYNC, NULL, NULL);
1053 struct thread* td_core;
1054 devfs_debug(DEVFS_DEBUG_DEBUG, "disk_init() called\n");
1056 disk_msg_cache = objcache_create("disk-msg-cache", 0, 0,
1058 objcache_malloc_alloc,
1059 objcache_malloc_free,
1060 &disk_msg_malloc_args );
1062 lwkt_token_init(&disklist_token);
1064 /* Initialize the reply-only port which acts as a message drain */
1065 lwkt_initport_replyonly(&disk_dispose_port, disk_msg_autofree_reply);
1067 lwkt_create(disk_msg_core, /*args*/NULL, &td_core, NULL,
1068 0, 0, "disk_msg_core");
1070 tsleep(td_core, 0, "diskcore", 0);
1077 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_uninit() called\n");
1079 objcache_destroy(disk_msg_cache);
1084 SYSINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_FIRST, disk_init, NULL);
1085 SYSUNINIT(disk_register, SI_SUB_PRE_DRIVERS, SI_ORDER_ANY, disk_uninit, NULL);