2 * Copyright (c) 1994 Bruce D. Evans.
5 * Copyright (c) 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
11 * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * from: @(#)wd.c 7.2 (Berkeley) 5/9/91
43 * from: wd.c,v 1.55 1994/10/22 01:57:12 phk Exp $
44 * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
45 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
46 * $FreeBSD: src/sys/kern/subr_diskslice.c,v 1.82.2.6 2001/07/24 09:49:41 dd Exp $
47 * $DragonFly: src/sys/kern/subr_diskslice.c,v 1.51 2008/08/29 20:08:36 dillon Exp $
50 #include <sys/param.h>
51 #include <sys/systm.h>
54 #include <sys/disklabel.h>
55 #include <sys/disklabel32.h>
56 #include <sys/disklabel64.h>
57 #include <sys/diskslice.h>
59 #include <sys/diskmbr.h>
60 #include <sys/fcntl.h>
61 #include <sys/malloc.h>
63 #include <sys/syslog.h>
65 #include <sys/vnode.h>
66 #include <sys/device.h>
67 #include <sys/thread2.h>
69 #include <vfs/ufs/dinode.h> /* XXX used only for fs.h */
70 #include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */
72 static int dsreadandsetlabel(cdev_t dev, u_int flags,
73 struct diskslices *ssp, struct diskslice *sp,
74 struct disk_info *info);
75 static void free_ds_label (struct diskslices *ssp, int slice);
76 static void set_ds_label (struct diskslices *ssp, int slice, disklabel_t lp,
78 static void set_ds_wlabel (struct diskslices *ssp, int slice, int wlabel);
81 * Determine the size of the transfer, and make sure it is
82 * within the boundaries of the partition. Adjust transfer
83 * if needed, and signal errors or early completion.
86 * o Split buffers that are too big for the device.
87 * o Check for overflow.
88 * o Finish cleaning this up.
90 * This function returns 1 on success, 0 if transfer equates
91 * to EOF (end of disk) or -1 on failure. The appropriate
92 * 'errno' value is also set in bp->b_error and bp->b_flags
93 * is marked with B_ERROR.
96 dscheck(cdev_t dev, struct bio *bio, struct diskslices *ssp)
98 struct buf *bp = bio->bio_buf;
105 u_int64_t slicerel_secno;
106 struct diskslice *sp;
112 slice = dkslice(dev);
115 if (bio->bio_offset < 0) {
116 kprintf("dscheck(%s): negative bio_offset %lld\n",
117 devtoname(dev), (long long)bio->bio_offset);
120 if (slice >= ssp->dss_nslices) {
121 kprintf("dscheck(%s): slice too large %d/%d\n",
122 devtoname(dev), slice, ssp->dss_nslices);
125 sp = &ssp->dss_slices[slice];
127 * Calculate secno and nsec
129 if (ssp->dss_secmult == 1) {
132 } else if (ssp->dss_secshift != -1) {
133 shift = DEV_BSHIFT + ssp->dss_secshift;
135 mask = (1 << shift) - 1;
136 if ((int)bp->b_bcount & mask)
138 if ((int)bio->bio_offset & mask)
140 secno = bio->bio_offset >> shift;
141 nsec = bp->b_bcount >> shift;
143 if (bp->b_bcount % ssp->dss_secsize)
145 if (bio->bio_offset % ssp->dss_secsize)
147 secno = bio->bio_offset / ssp->dss_secsize;
148 nsec = bp->b_bcount / ssp->dss_secsize;
152 * Calculate slice-relative sector number end slice-relative
155 if (slice == WHOLE_DISK_SLICE) {
157 * Labels have not been allowed on whole-disks for a while.
158 * This really puts the nail in the coffin.
160 * Accesses to the WHOLE_DISK_SLICE do not use a disklabel
161 * and partition numbers are special-cased. Currently numbers
162 * less then 128 are not allowed. Partition numbers >= 128
163 * are encoded in the high 8 bits of the 64 bit buffer offset
164 * and are fed directly through to the device with no
165 * further interpretation. In particular, no sector
166 * translation interpretation should occur because the
167 * sector size for the special raw access may not be the
168 * same as the nominal sector size for the device.
172 kprintf("dscheck(%s): illegal partition number (%d) "
173 "for WHOLE_DISK_SLICE access\n",
174 devtoname(dev), part);
176 } else if (part != WHOLE_SLICE_PART) {
177 nbio = push_bio(bio);
178 nbio->bio_offset = bio->bio_offset |
179 (u_int64_t)part << 56;
183 * If writing to the raw disk request a
184 * reprobe on the last close.
186 if (bp->b_cmd == BUF_CMD_WRITE)
187 sp->ds_flags |= DSF_REPROBE;
191 * sp->ds_size is for the whole disk in the WHOLE_DISK_SLICE,
192 * there are no reserved areas.
194 endsecno = sp->ds_size;
195 slicerel_secno = secno;
196 } else if (part == WHOLE_SLICE_PART) {
198 * NOTE! opens on a whole-slice partition will not attempt
199 * to read a disklabel in, so there may not be an in-core
200 * disklabel even if there is one on the disk.
202 endsecno = sp->ds_size;
203 slicerel_secno = secno;
204 } else if ((lp = sp->ds_label).opaque != NULL) {
206 * A label is present, extract the partition. Snooping of
207 * the disklabel is not supported even if accessible. Of
208 * course, the reserved area is still write protected.
211 if (ops->op_getpartbounds(ssp, lp, part,
212 &slicerel_secno, &endsecno)) {
213 kprintf("dscheck(%s): partition %d out of bounds\n",
214 devtoname(dev), part);
217 slicerel_secno += secno;
220 * Attempt to access partition when no disklabel present
222 kprintf("dscheck(%s): attempt to access non-existent partition\n",
228 * Disallow writes to reserved areas unless ds_wlabel allows it.
229 * If the reserved area is written to request a reprobe of the
230 * disklabel when the slice is closed.
232 if (slicerel_secno < sp->ds_reserved && nsec &&
233 bp->b_cmd == BUF_CMD_WRITE) {
234 if (sp->ds_wlabel == 0) {
238 sp->ds_flags |= DSF_REPROBE;
242 * If we get here, bio_offset must be on a block boundary and
243 * the sector size must be a power of 2.
245 if ((bio->bio_offset & (ssp->dss_secsize - 1)) ||
246 (ssp->dss_secsize ^ (ssp->dss_secsize - 1)) !=
247 ((ssp->dss_secsize << 1) - 1)) {
248 kprintf("%s: invalid BIO offset, not sector aligned or"
249 " invalid sector size (not power of 2) %08llx %d\n",
250 devtoname(dev), (long long)bio->bio_offset,
258 if (secno + nsec > endsecno) {
260 * Return an error if beyond the end of the disk, or
261 * if B_BNOCLIP is set. Tell the system that we do not
262 * need to keep the buffer around.
264 if (secno > endsecno || (bp->b_flags & B_BNOCLIP))
268 * If exactly at end of disk, return an EOF. Throw away
269 * the buffer contents, if any, by setting B_INVAL.
271 if (secno == endsecno) {
272 bp->b_resid = bp->b_bcount;
273 bp->b_flags |= B_INVAL;
280 nsec = endsecno - secno;
281 bp->b_bcount = nsec * ssp->dss_secsize;
284 nbio = push_bio(bio);
285 nbio->bio_offset = (off_t)(sp->ds_offset + slicerel_secno) *
291 "dscheck(%s): b_bcount %d is not on a sector boundary (ssize %d)\n",
292 devtoname(dev), bp->b_bcount, ssp->dss_secsize);
297 "dscheck(%s): bio_offset %lld is not on a sector boundary (ssize %d)\n",
298 devtoname(dev), (long long)bio->bio_offset, ssp->dss_secsize);
300 bp->b_error = EINVAL;
304 * Terminate the I/O with a ranging error. Since the buffer is
305 * either illegal or beyond the file EOF, mark it B_INVAL as well.
307 bp->b_resid = bp->b_bcount;
308 bp->b_flags |= B_ERROR | B_INVAL;
311 * Caller must biodone() the originally passed bio if NULL is
318 * dsclose() - close a cooked disk slice.
320 * WARNING! The passed diskslices and related diskslice structures may
321 * be invalidated or replaced by this function, callers must
322 * reload from the disk structure for continued access.
325 dsclose(cdev_t dev, int mode, struct diskslices *ssp)
329 struct diskslice *sp;
331 slice = dkslice(dev);
333 if (slice < ssp->dss_nslices) {
334 sp = &ssp->dss_slices[slice];
336 if (sp->ds_flags & DSF_REPROBE) {
337 sp->ds_flags &= ~DSF_REPROBE;
338 if (slice == WHOLE_DISK_SLICE) {
339 kprintf("reprobe whole disk\n");
340 disk_msg_send_sync(DISK_DISK_REPROBE,
343 kprintf("reprobe slice\n");
344 disk_msg_send_sync(DISK_SLICE_REPROBE,
347 /* ssp and sp may both be invalid after reprobe */
353 dsgone(struct diskslices **sspp)
356 struct diskslice *sp;
357 struct diskslices *ssp;
359 kprintf("dsgone is called... fear!\n");
361 for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) {
362 sp = &ssp->dss_slices[slice];
363 free_ds_label(ssp, slice);
365 kfree(ssp, M_DEVBUF);
370 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
371 * is subject to the same restriction as dsopen().
374 dsioctl(cdev_t dev, u_long cmd, caddr_t data, int flags,
375 struct diskslices **sspp, struct disk_info *info)
382 u_int32_t openmask[DKMAXPARTITIONS/(sizeof(u_int32_t)*8)];
385 struct diskslice *sp;
386 struct diskslices *ssp;
388 slice = dkslice(dev);
391 if (slice >= ssp->dss_nslices)
393 sp = &ssp->dss_slices[slice];
395 ops = sp->ds_ops; /* may be NULL if no label */
399 ops = &disklabel32_ops;
402 if (cmd != DIOCGDVIRGIN32)
403 ops = &disklabel64_ops;
405 * You can only retrieve a virgin disklabel on the whole
406 * disk slice or whole-slice partition.
408 if (slice != WHOLE_DISK_SLICE &&
409 part != WHOLE_SLICE_PART) {
414 ops->op_makevirginlabel(lp, ssp, sp, info);
420 * You can only retrieve a disklabel on the whole
423 * We do not support labels directly on whole-disks
424 * any more (that is, disks without slices), unless the
425 * device driver has asked for a compatible label (e.g.
426 * for a CD) to allow booting off of storage that is
427 * otherwise unlabeled.
430 if (part != WHOLE_SLICE_PART)
432 if (slice == WHOLE_DISK_SLICE &&
433 (info->d_dsflags & DSO_COMPATLABEL) == 0) {
436 if (sp->ds_label.opaque == NULL) {
437 error = dsreadandsetlabel(dev, info->d_dsflags,
439 ops = sp->ds_ops; /* may be NULL */
443 * The type of label we found must match the type of
446 if (error == 0 && IOCPARM_LEN(cmd) != ops->labelsize)
449 bcopy(sp->ds_label.opaque, data, ops->labelsize);
454 struct partinfo *dpart = (void *)data;
457 * The disk management layer may not have read the
458 * disklabel yet because simply opening a slice no
459 * longer 'probes' the disk that way. Be sure we
462 * We ignore any error.
464 if (sp->ds_label.opaque == NULL &&
465 part == WHOLE_SLICE_PART &&
466 slice != WHOLE_DISK_SLICE) {
467 kprintf("dsioctl: I shouldn't be here...\n");
468 dsreadandsetlabel(dev, info->d_dsflags,
470 ops = sp->ds_ops; /* may be NULL */
473 bzero(dpart, sizeof(*dpart));
474 dpart->media_offset = (u_int64_t)sp->ds_offset *
475 info->d_media_blksize;
476 dpart->media_size = (u_int64_t)sp->ds_size *
477 info->d_media_blksize;
478 dpart->media_blocks = sp->ds_size;
479 dpart->media_blksize = info->d_media_blksize;
480 dpart->reserved_blocks= sp->ds_reserved;
481 dpart->fstype_uuid = sp->ds_type_uuid;
482 dpart->storage_uuid = sp->ds_stor_uuid;
484 if (slice != WHOLE_DISK_SLICE &&
485 part != WHOLE_SLICE_PART) {
488 if (lp.opaque == NULL)
490 if (ops->op_getpartbounds(ssp, lp, part,
494 ops->op_loadpartinfo(lp, part, dpart);
495 dpart->media_offset += start *
496 info->d_media_blksize;
497 dpart->media_size = blocks *
498 info->d_media_blksize;
499 dpart->media_blocks = blocks;
502 * partition starting sector (p_offset)
503 * requires slice's reserved areas to be
506 if (dpart->reserved_blocks > start)
507 dpart->reserved_blocks -= start;
509 dpart->reserved_blocks = 0;
513 * Load remaining fields from the info structure
515 dpart->d_nheads = info->d_nheads;
516 dpart->d_ncylinders = info->d_ncylinders;
517 dpart->d_secpertrack = info->d_secpertrack;
518 dpart->d_secpercyl = info->d_secpercyl;
523 bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] -
528 ops = &disklabel32_ops;
531 if (cmd != DIOCSDINFO32)
532 ops = &disklabel64_ops;
534 * You can write a disklabel on the whole disk slice or
535 * whole-slice partition.
537 if (slice != WHOLE_DISK_SLICE &&
538 part != WHOLE_SLICE_PART) {
543 * We no longer support writing disklabels directly to media
544 * without there being a slice. Keep this as a separate
547 if (slice == WHOLE_DISK_SLICE)
549 if (!(flags & FWRITE))
553 * If an existing label is present it must be the same
554 * type as the label being passed by the ioctl.
556 if (sp->ds_label.opaque && sp->ds_ops != ops)
560 * Create a temporary copy of the existing label
561 * (if present) so setdisklabel can compare it against
564 lp.opaque = kmalloc(ops->labelsize, M_DEVBUF, M_WAITOK);
565 if (sp->ds_label.opaque == NULL)
566 bzero(lp.opaque, ops->labelsize);
568 bcopy(sp->ds_label.opaque, lp.opaque, ops->labelsize);
569 if (sp->ds_label.opaque == NULL) {
570 bzero(openmask, sizeof(openmask));
572 bcopy(sp->ds_openmask, openmask, sizeof(openmask));
575 error = ops->op_setdisklabel(lp, lptmp, ssp, sp, openmask);
576 //XXX: send reprobe message here.
577 disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp);
579 kfree(lp.opaque, M_DEVBUF);
582 free_ds_label(ssp, slice);
583 set_ds_label(ssp, slice, lp, ops);
586 case DIOCSYNCSLICEINFO:
588 * This ioctl can only be done on the whole disk
590 if (slice != WHOLE_DISK_SLICE || part != WHOLE_SLICE_PART)
593 if (*(int *)data == 0) {
594 for (slice = 0; slice < ssp->dss_nslices; slice++) {
595 struct diskslice *ds = &ssp->dss_slices[slice];
597 switch(dscountmask(ds)) {
601 if (slice != WHOLE_DISK_SLICE)
603 if (!dschkmask(ds, RAW_PART))
612 disk_msg_send_sync(DISK_DISK_REPROBE, dev->si_disk, NULL);
616 * Temporarily forget the current slices struct and read
621 * XXX should wait for current accesses on this disk to
622 * complete, then lock out future accesses and opens.
624 kprintf("dsioctl messed with our stuff!\n");
626 error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, info);
633 * Reopen everything. This is a no-op except in the "force"
634 * case and when the raw bdev and cdev are both open. Abort
637 for (slice = 0; slice < ssp->dss_nslices; slice++) {
638 for (part = 0; part < DKMAXPARTITIONS; ++part) {
639 if (!dschkmask(&ssp->dss_slices[slice], part))
641 error = dsopen(dkmodslice(dkmodpart(dev, part),
643 S_IFCHR, ssp->dss_oflags, sspp,
652 //XXX: recheck this...
659 error = dsioctl(dev, ((cmd == DIOCWDINFO32) ?
660 DIOCSDINFO32 : DIOCSDINFO64),
661 data, flags, &ssp, info);
662 if (error == 0 && sp->ds_label.opaque == NULL)
664 if (part != WHOLE_SLICE_PART)
670 * Allow the reserved area to be written, reload ops
671 * because the DIOCSDINFO op above may have installed
675 old_wlabel = sp->ds_wlabel;
676 set_ds_wlabel(ssp, slice, TRUE);
677 error = ops->op_writedisklabel(dev, ssp, sp, sp->ds_label);
678 disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp);
679 set_ds_wlabel(ssp, slice, old_wlabel);
680 /* XXX should invalidate in-core label if write failed. */
684 if (slice == WHOLE_DISK_SLICE)
686 if (!(flags & FWRITE))
688 set_ds_wlabel(ssp, slice, *(int *)data != 0);
697 dsisopen(struct diskslices *ssp)
703 for (slice = 0; slice < ssp->dss_nslices; slice++) {
704 if (dscountmask(&ssp->dss_slices[slice]))
711 * Allocate a slices "struct" and initialize it to contain only an empty
712 * compatibility slice (pointing to itself), a whole disk slice (covering
713 * the disk as described by the label), and (nslices - BASE_SLICES) empty
714 * slices beginning at BASE_SLICE.
716 * Note that the compatibility slice is no longer really a compatibility
717 * slice. It is slice 0 if a GPT label is present, and the dangerously
718 * dedicated slice if no slice table otherwise exists. Else it is 0-sized.
721 dsmakeslicestruct(int nslices, struct disk_info *info)
723 struct diskslice *sp;
724 struct diskslices *ssp;
726 ssp = kmalloc(offsetof(struct diskslices, dss_slices) +
727 nslices * sizeof *sp, M_DEVBUF, M_WAITOK);
728 ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
729 ssp->dss_nslices = nslices;
733 * Figure out if we can use shifts or whether we have to
734 * use mod/multply to translate byte offsets into sector numbers.
736 if ((info->d_media_blksize ^ (info->d_media_blksize - 1)) ==
737 (info->d_media_blksize << 1) - 1) {
738 ssp->dss_secmult = info->d_media_blksize / DEV_BSIZE;
739 if (ssp->dss_secmult & (ssp->dss_secmult - 1))
740 ssp->dss_secshift = -1;
742 ssp->dss_secshift = ffs(ssp->dss_secmult) - 1;
744 ssp->dss_secmult = 0;
745 ssp->dss_secshift = -1;
747 ssp->dss_secsize = info->d_media_blksize;
748 sp = &ssp->dss_slices[0];
749 bzero(sp, nslices * sizeof *sp);
750 sp[WHOLE_DISK_SLICE].ds_size = info->d_media_blocks;
755 dsname(cdev_t dev, int unit, int slice, int part, char *partname)
761 * This should only be called when the unit is inactive and the strategy
762 * routine should not allow it to become active unless we call it. Our
763 * strategy routine must be special to allow activity.
766 dsopen(cdev_t dev, int mode, u_int flags,
767 struct diskslices **sspp, struct disk_info *info)
772 struct diskslice *sp;
773 struct diskslices *ssp;
778 dev->si_bsize_phys = info->d_media_blksize;
779 slice = dkslice(dev);
781 sp = &ssp->dss_slices[slice];
787 * Do not attempt to read the slice table or disk label when
788 * accessing the whole-disk slice or a while-slice partition.
790 if (dkslice(dev) == WHOLE_DISK_SLICE)
791 flags |= DSO_ONESLICE | DSO_NOLABELS;
792 if (dkpart(dev) == WHOLE_SLICE_PART)
793 flags |= DSO_NOLABELS;
796 * Reinitialize the slice table unless there is an open device
799 * It would be nice if we didn't have to do this but when a
800 * user is slicing and partitioning up a disk it is a lot safer
801 * to not take any chances.
804 need_init = !dsisopen(ssp);
805 if (ssp != NULL && need_init)
809 * Allocate a minimal slices "struct". This will become
810 * the final slices "struct" if we don't want real slices
811 * or if we can't find any real slices.
815 *sspp = dsmakeslicestruct(BASE_SLICE, info);
817 if ((flags & DSO_ONESLICE) == 0) {
818 error = mbrinit(dev, info, sspp);
825 ssp->dss_oflags = flags;
828 * If there are no real slices, then make the compatiblity
829 * slice cover the whole disk.
831 if (ssp->dss_nslices == BASE_SLICE) {
832 sp = &ssp->dss_slices[COMPATIBILITY_SLICE];
834 sp->ds_size = info->d_media_blocks;
839 * Set dss_first_bsd_slice to point at the first BSD
842 for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) {
843 sp = &ssp->dss_slices[slice];
844 if (sp->ds_type == DOSPTYP_386BSD /* XXX */) {
846 struct diskslice *csp;
849 ssp->dss_first_bsd_slice = slice;
852 * no longer supported, s0 is a real slice
855 csp = &ssp->dss_slices[COMPATIBILITY_SLICE];
856 csp->ds_offset = sp->ds_offset;
857 csp->ds_size = sp->ds_size;
858 csp->ds_type = sp->ds_type;
859 csp->ds_reserved = sp->ds_reserved;
866 * By definition accesses via the whole-disk device do not
867 * specify any reserved areas. The whole disk may be read
868 * or written by the whole-disk device.
870 * The whole-disk slice does not ever have a label.
872 sp = &ssp->dss_slices[WHOLE_DISK_SLICE];
873 sp->ds_wlabel = TRUE;
878 * Load the disklabel for the slice being accessed unless it is
879 * a whole-disk-slice or a whole-slice-partition (as determined
882 * We could scan all slices here and try to load up their
883 * disklabels, but that would cause us to access slices that
884 * the user may otherwise not intend us to access, or corrupted
887 * XXX if there are no opens on the slice we may want to re-read
888 * the disklabel anyway, even if we have one cached.
890 slice = dkslice(dev);
891 if (slice >= ssp->dss_nslices)
893 sp = &ssp->dss_slices[slice];
896 if ((flags & DSO_NOLABELS) == 0 && sp->ds_label.opaque == NULL) {
897 dev1 = dkmodslice(dkmodpart(dev, WHOLE_SLICE_PART), slice);
900 * If opening a raw disk we do not try to
901 * read the disklabel now. No interpretation of raw disks
902 * (e.g. like 'da0') ever occurs. We will try to read the
903 * disklabel for a raw slice if asked to via DIOC* ioctls.
905 * Access to the label area is disallowed by default. Note
906 * however that accesses via WHOLE_DISK_SLICE, and accesses
907 * via WHOLE_SLICE_PART for slices without valid disklabels,
908 * will allow writes and ignore the flag.
910 set_ds_wlabel(ssp, slice, FALSE);
911 dsreadandsetlabel(dev1, flags, ssp, sp, info);
915 * If opening a particular partition the disklabel must exist and
916 * the partition must be present in the label.
918 * If the partition is the special whole-disk-slice no partition
921 if (part != WHOLE_SLICE_PART && slice != WHOLE_DISK_SLICE) {
922 if (sp->ds_label.opaque == NULL ||
923 part >= sp->ds_ops->op_getnumparts(sp->ds_label)) {
929 * Do not allow special raw-extension partitions to be opened
930 * if the device doesn't support them. Raw-extension partitions
931 * are typically used to handle CD tracks.
933 if (slice == WHOLE_DISK_SLICE && part >= 128 &&
934 part != WHOLE_SLICE_PART) {
935 if ((info->d_dsflags & DSO_RAWEXTENSIONS) == 0)
947 * Attempt to read the disklabel. If successful, store it in sp->ds_label.
949 * If we cannot read the disklabel and DSO_COMPATLABEL is set, we construct
950 * a fake label covering the whole disk.
954 dsreadandsetlabel(cdev_t dev, u_int flags,
955 struct diskslices *ssp, struct diskslice *sp,
956 struct disk_info *info)
963 int slice = dkslice(dev);
966 * Probe the disklabel
969 sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART, partname);
970 ops = &disklabel32_ops;
971 msg = ops->op_readdisklabel(dev, sp, &lp, info);
972 if (msg && strcmp(msg, "no disk label") == 0) {
973 ops = &disklabel64_ops;
974 msg = disklabel64_ops.op_readdisklabel(dev, sp, &lp, info);
978 * If we failed and COMPATLABEL is set, create a dummy disklabel.
980 if (msg != NULL && (flags & DSO_COMPATLABEL)) {
982 if (sp->ds_size >= 0x100000000ULL)
983 ops = &disklabel64_ops;
985 ops = &disklabel32_ops;
986 lp = ops->op_clone_label(info, sp);
989 if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
990 log(LOG_WARNING, "%s: cannot find label (%s)\n",
993 kfree(lp.opaque, M_DEVBUF);
995 set_ds_label(ssp, slice, lp, ops);
996 set_ds_wlabel(ssp, slice, FALSE);
998 return (msg ? EINVAL : 0);
1002 dssize(cdev_t dev, struct diskslices **sspp)
1005 disklabel_ops_t ops;
1008 struct diskslices *ssp;
1012 slice = dkslice(dev);
1015 if (ssp == NULL || slice >= ssp->dss_nslices
1016 || !dschkmask(&ssp->dss_slices[slice], part)) {
1017 if (dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred) != 0)
1019 dev_dclose(dev, FREAD, S_IFCHR);
1022 lp = ssp->dss_slices[slice].ds_label;
1023 if (lp.opaque == NULL)
1025 ops = ssp->dss_slices[slice].ds_ops;
1026 if (ops->op_getpartbounds(ssp, lp, part, &start, &blocks))
1028 return ((int64_t)blocks);
1032 free_ds_label(struct diskslices *ssp, int slice)
1034 struct diskslice *sp;
1037 sp = &ssp->dss_slices[slice];
1039 if (lp.opaque != NULL) {
1040 kfree(lp.opaque, M_DEVBUF);
1042 set_ds_label(ssp, slice, lp, NULL);
1047 set_ds_label(struct diskslices *ssp, int slice,
1048 disklabel_t lp, disklabel_ops_t ops)
1050 struct diskslice *sp = &ssp->dss_slices[slice];
1054 if (lp.opaque && slice != WHOLE_DISK_SLICE)
1055 ops->op_adjust_label_reserved(ssp, slice, sp);
1057 sp->ds_reserved = 0;
1061 set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel)
1063 ssp->dss_slices[slice].ds_wlabel = wlabel;