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 1.50 2008/04/20 13:44:25 swildner 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
), 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
];
128 * Calculate secno and nsec
130 if (ssp
->dss_secmult
== 1) {
133 } else if (ssp
->dss_secshift
!= -1) {
134 shift
= DEV_BSHIFT
+ ssp
->dss_secshift
;
136 mask
= (1 << shift
) - 1;
137 if ((int)bp
->b_bcount
& mask
)
139 if ((int)bio
->bio_offset
& mask
)
141 secno
= bio
->bio_offset
>> shift
;
142 nsec
= bp
->b_bcount
>> shift
;
144 if (bp
->b_bcount
% ssp
->dss_secsize
)
146 if (bio
->bio_offset
% ssp
->dss_secsize
)
148 secno
= bio
->bio_offset
/ ssp
->dss_secsize
;
149 nsec
= bp
->b_bcount
/ ssp
->dss_secsize
;
153 * Calculate slice-relative sector number end slice-relative
156 if (slice
== WHOLE_DISK_SLICE
) {
158 * Labels have not been allowed on whole-disks for a while.
159 * This really puts the nail in the coffin.
161 * Accesses to the WHOLE_DISK_SLICE do not use a disklabel
162 * and partition numbers are special-cased. Currently numbers
163 * less then 128 are not allowed. Partition numbers >= 128
164 * are encoded in the high 8 bits of the 64 bit buffer offset
165 * and are fed directly through to the device with no
166 * further interpretation. In particular, no sector
167 * translation interpretation should occur because the
168 * sector size for the special raw access may not be the
169 * same as the nominal sector size for the device.
173 kprintf("dscheck(%s): illegal partition number (%d) "
174 "for WHOLE_DISK_SLICE access\n",
175 devtoname(dev
), part
);
177 } else if (part
!= WHOLE_SLICE_PART
) {
178 nbio
= push_bio(bio
);
179 nbio
->bio_offset
= bio
->bio_offset
|
180 (u_int64_t
)part
<< 56;
185 * sp->ds_size is for the whole disk in the WHOLE_DISK_SLICE,
186 * there are no reserved areas.
188 endsecno
= sp
->ds_size
;
189 slicerel_secno
= secno
;
190 } else if (part
== WHOLE_SLICE_PART
) {
192 * NOTE! opens on a whole-slice partition will not attempt
193 * to read a disklabel in, so there may not be an in-core
194 * disklabel even if there is one on the disk.
196 endsecno
= sp
->ds_size
;
197 slicerel_secno
= secno
;
198 } else if ((lp
= sp
->ds_label
).opaque
!= NULL
) {
200 * A label is present, extract the partition. Snooping of
201 * the disklabel is not supported even if accessible. Of
202 * course, the reserved area is still write protected.
205 if (ops
->op_getpartbounds(ssp
, lp
, part
,
206 &slicerel_secno
, &endsecno
)) {
207 kprintf("dscheck(%s): partition %d out of bounds\n",
208 devtoname(dev
), part
);
211 slicerel_secno
+= secno
;
214 * Attempt to access partition when no disklabel present
216 kprintf("dscheck(%s): attempt to access non-existent partition\n",
222 * Disallow writes to reserved areas unless ds_wlabel allows it.
224 if (slicerel_secno
< sp
->ds_reserved
&& nsec
&&
225 bp
->b_cmd
!= BUF_CMD_READ
&& sp
->ds_wlabel
== 0) {
231 * If we get here, bio_offset must be on a block boundary and
232 * the sector size must be a power of 2.
234 if ((bio
->bio_offset
& (ssp
->dss_secsize
- 1)) ||
235 (ssp
->dss_secsize
^ (ssp
->dss_secsize
- 1)) !=
236 ((ssp
->dss_secsize
<< 1) - 1)) {
237 kprintf("%s: invalid BIO offset, not sector aligned or"
238 " invalid sector size (not power of 2) %08llx %d\n",
239 devtoname(dev
), bio
->bio_offset
, ssp
->dss_secsize
);
246 if (secno
+ nsec
> endsecno
) {
248 * Return an error if beyond the end of the disk, or
249 * if B_BNOCLIP is set. Tell the system that we do not
250 * need to keep the buffer around.
252 if (secno
> endsecno
|| (bp
->b_flags
& B_BNOCLIP
))
256 * If exactly at end of disk, return an EOF. Throw away
257 * the buffer contents, if any, by setting B_INVAL.
259 if (secno
== endsecno
) {
260 bp
->b_resid
= bp
->b_bcount
;
261 bp
->b_flags
|= B_INVAL
;
268 nsec
= endsecno
- secno
;
269 bp
->b_bcount
= nsec
* ssp
->dss_secsize
;
272 nbio
= push_bio(bio
);
273 nbio
->bio_offset
= (off_t
)(sp
->ds_offset
+ slicerel_secno
) *
279 "dscheck(%s): b_bcount %d is not on a sector boundary (ssize %d)\n",
280 devtoname(dev
), bp
->b_bcount
, ssp
->dss_secsize
);
285 "dscheck(%s): bio_offset %lld is not on a sector boundary (ssize %d)\n",
286 devtoname(dev
), bio
->bio_offset
, ssp
->dss_secsize
);
288 bp
->b_error
= EINVAL
;
292 * Terminate the I/O with a ranging error. Since the buffer is
293 * either illegal or beyond the file EOF, mark it B_INVAL as well.
295 bp
->b_resid
= bp
->b_bcount
;
296 bp
->b_flags
|= B_ERROR
| B_INVAL
;
299 * Caller must biodone() the originally passed bio if NULL is
306 dsclose(cdev_t dev
, int mode
, struct diskslices
*ssp
)
310 struct diskslice
*sp
;
312 slice
= dkslice(dev
);
314 if (slice
< ssp
->dss_nslices
) {
315 sp
= &ssp
->dss_slices
[slice
];
321 dsgone(struct diskslices
**sspp
)
324 struct diskslice
*sp
;
325 struct diskslices
*ssp
;
327 for (slice
= 0, ssp
= *sspp
; slice
< ssp
->dss_nslices
; slice
++) {
328 sp
= &ssp
->dss_slices
[slice
];
329 free_ds_label(ssp
, slice
);
331 kfree(ssp
, M_DEVBUF
);
336 * For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
337 * is subject to the same restriction as dsopen().
340 dsioctl(cdev_t dev
, u_long cmd
, caddr_t data
, int flags
,
341 struct diskslices
**sspp
, struct disk_info
*info
)
348 u_int32_t openmask
[DKMAXPARTITIONS
/(sizeof(u_int32_t
)*8)];
351 struct diskslice
*sp
;
352 struct diskslices
*ssp
;
354 slice
= dkslice(dev
);
357 if (slice
>= ssp
->dss_nslices
)
359 sp
= &ssp
->dss_slices
[slice
];
361 ops
= sp
->ds_ops
; /* may be NULL if no label */
365 ops
= &disklabel32_ops
;
368 if (cmd
!= DIOCGDVIRGIN32
)
369 ops
= &disklabel64_ops
;
371 * You can only retrieve a virgin disklabel on the whole
372 * disk slice or whole-slice partition.
374 if (slice
!= WHOLE_DISK_SLICE
&&
375 part
!= WHOLE_SLICE_PART
) {
380 ops
->op_makevirginlabel(lp
, ssp
, sp
, info
);
386 * You can only retrieve a disklabel on the whole
389 * We do not support labels directly on whole-disks
390 * any more (that is, disks without slices), unless the
391 * device driver has asked for a compatible label (e.g.
392 * for a CD) to allow booting off of storage that is
393 * otherwise unlabeled.
396 if (part
!= WHOLE_SLICE_PART
)
398 if (slice
== WHOLE_DISK_SLICE
&&
399 (info
->d_dsflags
& DSO_COMPATLABEL
) == 0) {
402 if (sp
->ds_label
.opaque
== NULL
) {
403 error
= dsreadandsetlabel(dev
, info
->d_dsflags
,
405 ops
= sp
->ds_ops
; /* may be NULL */
409 * The type of label we found must match the type of
412 if (error
== 0 && IOCPARM_LEN(cmd
) != ops
->labelsize
)
415 bcopy(sp
->ds_label
.opaque
, data
, ops
->labelsize
);
420 struct partinfo
*dpart
= (void *)data
;
423 * The disk management layer may not have read the
424 * disklabel yet because simply opening a slice no
425 * longer 'probes' the disk that way. Be sure we
428 * We ignore any error.
430 if (sp
->ds_label
.opaque
== NULL
&&
431 part
== WHOLE_SLICE_PART
&&
432 slice
!= WHOLE_DISK_SLICE
) {
433 dsreadandsetlabel(dev
, info
->d_dsflags
,
435 ops
= sp
->ds_ops
; /* may be NULL */
438 bzero(dpart
, sizeof(*dpart
));
439 dpart
->media_offset
= (u_int64_t
)sp
->ds_offset
*
440 info
->d_media_blksize
;
441 dpart
->media_size
= (u_int64_t
)sp
->ds_size
*
442 info
->d_media_blksize
;
443 dpart
->media_blocks
= sp
->ds_size
;
444 dpart
->media_blksize
= info
->d_media_blksize
;
445 dpart
->reserved_blocks
= sp
->ds_reserved
;
446 dpart
->fstype_uuid
= sp
->ds_type_uuid
;
447 dpart
->storage_uuid
= sp
->ds_stor_uuid
;
449 if (slice
!= WHOLE_DISK_SLICE
&&
450 part
!= WHOLE_SLICE_PART
) {
453 if (lp
.opaque
== NULL
)
455 if (ops
->op_getpartbounds(ssp
, lp
, part
,
459 ops
->op_loadpartinfo(lp
, part
, dpart
);
460 dpart
->media_offset
+= start
*
461 info
->d_media_blksize
;
462 dpart
->media_size
= blocks
*
463 info
->d_media_blksize
;
464 dpart
->media_blocks
= blocks
;
467 * partition starting sector (p_offset)
468 * requires slice's reserved areas to be
471 if (dpart
->reserved_blocks
> start
)
472 dpart
->reserved_blocks
-= start
;
474 dpart
->reserved_blocks
= 0;
478 * Load remaining fields from the info structure
480 dpart
->d_nheads
= info
->d_nheads
;
481 dpart
->d_ncylinders
= info
->d_ncylinders
;
482 dpart
->d_secpertrack
= info
->d_secpertrack
;
483 dpart
->d_secpercyl
= info
->d_secpercyl
;
488 bcopy(ssp
, data
, (char *)&ssp
->dss_slices
[ssp
->dss_nslices
] -
493 ops
= &disklabel32_ops
;
496 if (cmd
!= DIOCSDINFO32
)
497 ops
= &disklabel64_ops
;
499 * You can write a disklabel on the whole disk slice or
500 * whole-slice partition.
502 if (slice
!= WHOLE_DISK_SLICE
&&
503 part
!= WHOLE_SLICE_PART
) {
508 * We no longer support writing disklabels directly to media
509 * without there being a slice. Keep this as a separate
512 if (slice
== WHOLE_DISK_SLICE
)
514 if (!(flags
& FWRITE
))
518 * If an existing label is present it must be the same
519 * type as the label being passed by the ioctl.
521 if (sp
->ds_label
.opaque
&& sp
->ds_ops
!= ops
)
525 * Create a temporary copy of the existing label
526 * (if present) so setdisklabel can compare it against
529 lp
.opaque
= kmalloc(ops
->labelsize
, M_DEVBUF
, M_WAITOK
);
530 if (sp
->ds_label
.opaque
== NULL
)
531 bzero(lp
.opaque
, ops
->labelsize
);
533 bcopy(sp
->ds_label
.opaque
, lp
.opaque
, ops
->labelsize
);
534 if (sp
->ds_label
.opaque
== NULL
) {
535 bzero(openmask
, sizeof(openmask
));
537 bcopy(sp
->ds_openmask
, openmask
, sizeof(openmask
));
540 error
= ops
->op_setdisklabel(lp
, lptmp
, ssp
, sp
, openmask
);
542 kfree(lp
.opaque
, M_DEVBUF
);
545 free_ds_label(ssp
, slice
);
546 set_ds_label(ssp
, slice
, lp
, ops
);
549 case DIOCSYNCSLICEINFO
:
551 * This ioctl can only be done on the whole disk
553 if (slice
!= WHOLE_DISK_SLICE
|| part
!= WHOLE_SLICE_PART
)
556 if (*(int *)data
== 0) {
557 for (slice
= 0; slice
< ssp
->dss_nslices
; slice
++) {
558 struct diskslice
*ds
= &ssp
->dss_slices
[slice
];
560 switch(dscountmask(ds
)) {
564 if (slice
!= WHOLE_DISK_SLICE
)
566 if (!dschkmask(ds
, RAW_PART
))
576 * Temporarily forget the current slices struct and read
581 * XXX should wait for current accesses on this disk to
582 * complete, then lock out future accesses and opens.
585 error
= dsopen(dev
, S_IFCHR
, ssp
->dss_oflags
, sspp
, info
);
592 * Reopen everything. This is a no-op except in the "force"
593 * case and when the raw bdev and cdev are both open. Abort
596 for (slice
= 0; slice
< ssp
->dss_nslices
; slice
++) {
597 for (part
= 0; part
< DKMAXPARTITIONS
; ++part
) {
598 if (!dschkmask(&ssp
->dss_slices
[slice
], part
))
600 error
= dsopen(dkmodslice(dkmodpart(dev
, part
),
602 S_IFCHR
, ssp
->dss_oflags
, sspp
,
616 error
= dsioctl(dev
, ((cmd
== DIOCWDINFO32
) ?
617 DIOCSDINFO32
: DIOCSDINFO64
),
618 data
, flags
, &ssp
, info
);
619 if (error
== 0 && sp
->ds_label
.opaque
== NULL
)
625 * Allow the reserved area to be written, reload ops
626 * because the DIOCSDINFO op above may have installed
630 old_wlabel
= sp
->ds_wlabel
;
631 set_ds_wlabel(ssp
, slice
, TRUE
);
632 error
= ops
->op_writedisklabel(dev
, ssp
, sp
, sp
->ds_label
);
633 set_ds_wlabel(ssp
, slice
, old_wlabel
);
634 /* XXX should invalidate in-core label if write failed. */
638 if (slice
== WHOLE_DISK_SLICE
)
640 if (!(flags
& FWRITE
))
642 set_ds_wlabel(ssp
, slice
, *(int *)data
!= 0);
651 dsisopen(struct diskslices
*ssp
)
657 for (slice
= 0; slice
< ssp
->dss_nslices
; slice
++) {
658 if (dscountmask(&ssp
->dss_slices
[slice
]))
665 * Allocate a slices "struct" and initialize it to contain only an empty
666 * compatibility slice (pointing to itself), a whole disk slice (covering
667 * the disk as described by the label), and (nslices - BASE_SLICES) empty
668 * slices beginning at BASE_SLICE.
670 * Note that the compatibility slice is no longer really a compatibility
671 * slice. It is slice 0 if a GPT label is present, and the dangerously
672 * dedicated slice if no slice table otherwise exists. Else it is 0-sized.
675 dsmakeslicestruct(int nslices
, struct disk_info
*info
)
677 struct diskslice
*sp
;
678 struct diskslices
*ssp
;
680 ssp
= kmalloc(offsetof(struct diskslices
, dss_slices
) +
681 nslices
* sizeof *sp
, M_DEVBUF
, M_WAITOK
);
682 ssp
->dss_first_bsd_slice
= COMPATIBILITY_SLICE
;
683 ssp
->dss_nslices
= nslices
;
687 * Figure out if we can use shifts or whether we have to
688 * use mod/multply to translate byte offsets into sector numbers.
690 if ((info
->d_media_blksize
^ (info
->d_media_blksize
- 1)) ==
691 (info
->d_media_blksize
<< 1) - 1) {
692 ssp
->dss_secmult
= info
->d_media_blksize
/ DEV_BSIZE
;
693 if (ssp
->dss_secmult
& (ssp
->dss_secmult
- 1))
694 ssp
->dss_secshift
= -1;
696 ssp
->dss_secshift
= ffs(ssp
->dss_secmult
) - 1;
698 ssp
->dss_secmult
= 0;
699 ssp
->dss_secshift
= -1;
701 ssp
->dss_secsize
= info
->d_media_blksize
;
702 sp
= &ssp
->dss_slices
[0];
703 bzero(sp
, nslices
* sizeof *sp
);
704 sp
[WHOLE_DISK_SLICE
].ds_size
= info
->d_media_blocks
;
709 dsname(cdev_t dev
, int unit
, int slice
, int part
, char *partname
)
711 static char name
[32];
715 dname
= dev_dname(dev
);
716 if (strlen(dname
) > 16)
717 dname
= "nametoolong";
718 ksnprintf(name
, sizeof(name
), "%s%d", dname
, unit
);
722 if (slice
!= WHOLE_DISK_SLICE
) {
724 * slice or slice + partition. BASE_SLICE is s1, but
725 * the compatibility slice (0) needs to be s0.
727 used
+= ksnprintf(name
+ used
, sizeof(name
) - used
,
728 "s%d", (slice
? slice
- BASE_SLICE
+ 1 : 0));
729 if (part
!= WHOLE_SLICE_PART
) {
730 used
+= ksnprintf(name
+ used
, sizeof(name
) - used
,
732 partname
[0] = 'a' + part
;
735 } else if (part
== WHOLE_SLICE_PART
) {
737 * whole-disk-device, raw access to disk
739 /* no string extension */
740 } else if (part
> 128) {
742 * whole-disk-device, extended raw access partitions.
743 * (typically used to access CD audio tracks)
745 used
+= ksnprintf(name
+ used
, sizeof(name
) - used
,
749 * whole-disk-device, illegal partition number
751 used
+= ksnprintf(name
+ used
, sizeof(name
) - used
,
758 * This should only be called when the unit is inactive and the strategy
759 * routine should not allow it to become active unless we call it. Our
760 * strategy routine must be special to allow activity.
763 dsopen(cdev_t dev
, int mode
, u_int flags
,
764 struct diskslices
**sspp
, struct disk_info
*info
)
769 struct diskslice
*sp
;
770 struct diskslices
*ssp
;
774 dev
->si_bsize_phys
= info
->d_media_blksize
;
777 * Do not attempt to read the slice table or disk label when
778 * accessing the whole-disk slice or a while-slice partition.
780 if (dkslice(dev
) == WHOLE_DISK_SLICE
)
781 flags
|= DSO_ONESLICE
| DSO_NOLABELS
;
782 if (dkpart(dev
) == WHOLE_SLICE_PART
)
783 flags
|= DSO_NOLABELS
;
786 * Reinitialize the slice table unless there is an open device
789 * It would be nice if we didn't have to do this but when a
790 * user is slicing and partitioning up a disk it is a lot safer
791 * to not take any chances.
794 need_init
= !dsisopen(ssp
);
795 if (ssp
!= NULL
&& need_init
)
799 * Allocate a minimal slices "struct". This will become
800 * the final slices "struct" if we don't want real slices
801 * or if we can't find any real slices.
805 *sspp
= dsmakeslicestruct(BASE_SLICE
, info
);
807 if ((flags
& DSO_ONESLICE
) == 0) {
808 error
= mbrinit(dev
, info
, sspp
);
815 ssp
->dss_oflags
= flags
;
818 * If there are no real slices, then make the compatiblity
819 * slice cover the whole disk.
821 if (ssp
->dss_nslices
== BASE_SLICE
) {
822 sp
= &ssp
->dss_slices
[COMPATIBILITY_SLICE
];
824 sp
->ds_size
= info
->d_media_blocks
;
829 * Set dss_first_bsd_slice to point at the first BSD
832 for (slice
= BASE_SLICE
; slice
< ssp
->dss_nslices
; slice
++) {
833 sp
= &ssp
->dss_slices
[slice
];
834 if (sp
->ds_type
== DOSPTYP_386BSD
/* XXX */) {
836 struct diskslice
*csp
;
839 ssp
->dss_first_bsd_slice
= slice
;
842 * no longer supported, s0 is a real slice
845 csp
= &ssp
->dss_slices
[COMPATIBILITY_SLICE
];
846 csp
->ds_offset
= sp
->ds_offset
;
847 csp
->ds_size
= sp
->ds_size
;
848 csp
->ds_type
= sp
->ds_type
;
849 csp
->ds_reserved
= sp
->ds_reserved
;
856 * By definition accesses via the whole-disk device do not
857 * specify any reserved areas. The whole disk may be read
858 * or written by the whole-disk device.
860 * The whole-disk slice does not ever have a label.
862 sp
= &ssp
->dss_slices
[WHOLE_DISK_SLICE
];
863 sp
->ds_wlabel
= TRUE
;
868 * Load the disklabel for the slice being accessed unless it is
869 * a whole-disk-slice or a whole-slice-partition (as determined
872 * We could scan all slices here and try to load up their
873 * disklabels, but that would cause us to access slices that
874 * the user may otherwise not intend us to access, or corrupted
877 * XXX if there are no opens on the slice we may want to re-read
878 * the disklabel anyway, even if we have one cached.
880 slice
= dkslice(dev
);
881 if (slice
>= ssp
->dss_nslices
)
883 sp
= &ssp
->dss_slices
[slice
];
886 if ((flags
& DSO_NOLABELS
) == 0 && sp
->ds_label
.opaque
== NULL
) {
887 dev1
= dkmodslice(dkmodpart(dev
, WHOLE_SLICE_PART
), slice
);
890 * If opening a raw disk we do not try to
891 * read the disklabel now. No interpretation of raw disks
892 * (e.g. like 'da0') ever occurs. We will try to read the
893 * disklabel for a raw slice if asked to via DIOC* ioctls.
895 * Access to the label area is disallowed by default. Note
896 * however that accesses via WHOLE_DISK_SLICE, and accesses
897 * via WHOLE_SLICE_PART for slices without valid disklabels,
898 * will allow writes and ignore the flag.
900 set_ds_wlabel(ssp
, slice
, FALSE
);
901 dsreadandsetlabel(dev1
, flags
, ssp
, sp
, info
);
905 * If opening a particular partition the disklabel must exist and
906 * the partition must be present in the label.
908 * If the partition is the special whole-disk-slice no partition
911 if (part
!= WHOLE_SLICE_PART
&& slice
!= WHOLE_DISK_SLICE
) {
912 if (sp
->ds_label
.opaque
== NULL
||
913 part
>= sp
->ds_ops
->op_getnumparts(sp
->ds_label
)) {
919 * Do not allow special raw-extension partitions to be opened
920 * if the device doesn't support them. Raw-extension partitions
921 * are typically used to handle CD tracks.
923 if (slice
== WHOLE_DISK_SLICE
&& part
>= 128 &&
924 part
!= WHOLE_SLICE_PART
) {
925 if ((info
->d_dsflags
& DSO_RAWEXTENSIONS
) == 0)
937 * Attempt to read the disklabel. If successful, store it in sp->ds_label.
939 * If we cannot read the disklabel and DSO_COMPATLABEL is set, we construct
940 * a fake label covering the whole disk.
944 dsreadandsetlabel(cdev_t dev
, u_int flags
,
945 struct diskslices
*ssp
, struct diskslice
*sp
,
946 struct disk_info
*info
)
953 int slice
= dkslice(dev
);
956 * Probe the disklabel
959 sname
= dsname(dev
, dkunit(dev
), slice
, WHOLE_SLICE_PART
, partname
);
960 ops
= &disklabel32_ops
;
961 msg
= ops
->op_readdisklabel(dev
, sp
, &lp
, info
);
962 if (msg
&& strcmp(msg
, "no disk label") == 0) {
963 ops
= &disklabel64_ops
;
964 msg
= disklabel64_ops
.op_readdisklabel(dev
, sp
, &lp
, info
);
968 * If we failed and COMPATLABEL is set, create a dummy disklabel.
970 if (msg
!= NULL
&& (flags
& DSO_COMPATLABEL
)) {
972 if (sp
->ds_size
>= 0x100000000ULL
)
973 ops
= &disklabel64_ops
;
975 ops
= &disklabel32_ops
;
976 lp
= ops
->op_clone_label(info
, sp
);
979 if (sp
->ds_type
== DOSPTYP_386BSD
/* XXX */)
980 log(LOG_WARNING
, "%s: cannot find label (%s)\n",
983 kfree(lp
.opaque
, M_DEVBUF
);
985 set_ds_label(ssp
, slice
, lp
, ops
);
986 set_ds_wlabel(ssp
, slice
, FALSE
);
988 return (msg
? EINVAL
: 0);
992 dssize(cdev_t dev
, struct diskslices
**sspp
)
998 struct diskslices
*ssp
;
1002 slice
= dkslice(dev
);
1005 if (ssp
== NULL
|| slice
>= ssp
->dss_nslices
1006 || !dschkmask(&ssp
->dss_slices
[slice
], part
)) {
1007 if (dev_dopen(dev
, FREAD
, S_IFCHR
, proc0
.p_ucred
) != 0)
1009 dev_dclose(dev
, FREAD
, S_IFCHR
);
1012 lp
= ssp
->dss_slices
[slice
].ds_label
;
1013 if (lp
.opaque
== NULL
)
1015 ops
= ssp
->dss_slices
[slice
].ds_ops
;
1016 if (ops
->op_getpartbounds(ssp
, lp
, part
, &start
, &blocks
))
1018 return ((int64_t)blocks
);
1022 free_ds_label(struct diskslices
*ssp
, int slice
)
1024 struct diskslice
*sp
;
1027 sp
= &ssp
->dss_slices
[slice
];
1029 if (lp
.opaque
!= NULL
) {
1030 kfree(lp
.opaque
, M_DEVBUF
);
1032 set_ds_label(ssp
, slice
, lp
, NULL
);
1037 set_ds_label(struct diskslices
*ssp
, int slice
,
1038 disklabel_t lp
, disklabel_ops_t ops
)
1040 struct diskslice
*sp
= &ssp
->dss_slices
[slice
];
1044 if (lp
.opaque
&& slice
!= WHOLE_DISK_SLICE
)
1045 ops
->op_adjust_label_reserved(ssp
, slice
, sp
);
1047 sp
->ds_reserved
= 0;
1051 set_ds_wlabel(struct diskslices
*ssp
, int slice
, int wlabel
)
1053 ssp
->dss_slices
[slice
].ds_wlabel
= wlabel
;