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subr_diskslice.c
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subr_diskslice.c
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/*-
* Copyright (c) 1994 Bruce D. Evans.
* All rights reserved.
*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)wd.c 7.2 (Berkeley) 5/9/91
* from: wd.c,v 1.55 1994/10/22 01:57:12 phk Exp $
* from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
* from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $
* $FreeBSD: src/sys/kern/subr_diskslice.c,v 1.82.2.6 2001/07/24 09:49:41 dd Exp $
* $DragonFly: src/sys/kern/subr_diskslice.c,v 1.51 2008/08/29 20:08:36 dillon Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/disklabel.h>
#include <sys/disklabel32.h>
#include <sys/disklabel64.h>
#include <sys/diskslice.h>
#include <sys/disk.h>
#include <sys/diskmbr.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/device.h>
#include <sys/thread2.h>
#include <vfs/ufs/dinode.h> /* XXX used only for fs.h */
#include <vfs/ufs/fs.h> /* XXX used only to get BBSIZE/SBSIZE */
#include <sys/devfs.h>
static int dsreadandsetlabel(cdev_t dev, u_int flags,
struct diskslices *ssp, struct diskslice *sp,
struct disk_info *info);
static void free_ds_label (struct diskslices *ssp, int slice);
static void set_ds_label (struct diskslices *ssp, int slice, disklabel_t lp,
disklabel_ops_t ops);
static void set_ds_wlabel (struct diskslices *ssp, int slice, int wlabel);
/*
* Determine the size of the transfer, and make sure it is
* within the boundaries of the partition. Adjust transfer
* if needed, and signal errors or early completion.
*
* XXX TODO:
* o Split buffers that are too big for the device.
* o Check for overflow.
* o Finish cleaning this up.
*
* This function returns 1 on success, 0 if transfer equates
* to EOF (end of disk) or -1 on failure. The appropriate
* 'errno' value is also set in bp->b_error and bp->b_flags
* is marked with B_ERROR.
*/
struct bio *
dscheck(cdev_t dev, struct bio *bio, struct diskslices *ssp)
{
struct buf *bp = bio->bio_buf;
struct bio *nbio;
disklabel_t lp;
disklabel_ops_t ops;
long nsec;
u_int64_t secno;
u_int64_t endsecno;
u_int64_t slicerel_secno;
struct diskslice *sp;
u_int32_t part;
u_int32_t slice;
int shift;
int mask;
slice = dkslice(dev);
part = dkpart(dev);
if (bio->bio_offset < 0) {
kprintf("dscheck(%s): negative bio_offset %lld\n",
devtoname(dev), (long long)bio->bio_offset);
goto bad;
}
if (slice >= ssp->dss_nslices) {
kprintf("dscheck(%s): slice too large %d/%d\n",
devtoname(dev), slice, ssp->dss_nslices);
goto bad;
}
sp = &ssp->dss_slices[slice];
/*
* Calculate secno and nsec
*/
if (ssp->dss_secmult == 1) {
shift = DEV_BSHIFT;
goto doshift;
} else if (ssp->dss_secshift != -1) {
shift = DEV_BSHIFT + ssp->dss_secshift;
doshift:
mask = (1 << shift) - 1;
if ((int)bp->b_bcount & mask)
goto bad_bcount;
if ((int)bio->bio_offset & mask)
goto bad_blkno;
secno = bio->bio_offset >> shift;
nsec = bp->b_bcount >> shift;
} else {
if (bp->b_bcount % ssp->dss_secsize)
goto bad_bcount;
if (bio->bio_offset % ssp->dss_secsize)
goto bad_blkno;
secno = bio->bio_offset / ssp->dss_secsize;
nsec = bp->b_bcount / ssp->dss_secsize;
}
/*
* Calculate slice-relative sector number end slice-relative
* limit.
*/
if (slice == WHOLE_DISK_SLICE) {
/*
* Labels have not been allowed on whole-disks for a while.
* This really puts the nail in the coffin.
*
* Accesses to the WHOLE_DISK_SLICE do not use a disklabel
* and partition numbers are special-cased. Currently numbers
* less then 128 are not allowed. Partition numbers >= 128
* are encoded in the high 8 bits of the 64 bit buffer offset
* and are fed directly through to the device with no
* further interpretation. In particular, no sector
* translation interpretation should occur because the
* sector size for the special raw access may not be the
* same as the nominal sector size for the device.
*/
lp.opaque = NULL;
if (part < 128) {
kprintf("dscheck(%s): illegal partition number (%d) "
"for WHOLE_DISK_SLICE access\n",
devtoname(dev), part);
goto bad;
} else if (part != WHOLE_SLICE_PART) {
nbio = push_bio(bio);
nbio->bio_offset = bio->bio_offset |
(u_int64_t)part << 56;
return(nbio);
} else {
/*
* If writing to the raw disk request a
* reprobe on the last close.
*/
if (bp->b_cmd == BUF_CMD_WRITE)
sp->ds_flags |= DSF_REPROBE;
}
/*
* sp->ds_size is for the whole disk in the WHOLE_DISK_SLICE,
* there are no reserved areas.
*/
endsecno = sp->ds_size;
slicerel_secno = secno;
} else if (part == WHOLE_SLICE_PART) {
/*
* NOTE! opens on a whole-slice partition will not attempt
* to read a disklabel in, so there may not be an in-core
* disklabel even if there is one on the disk.
*/
endsecno = sp->ds_size;
slicerel_secno = secno;
} else if ((lp = sp->ds_label).opaque != NULL) {
/*
* A label is present, extract the partition. Snooping of
* the disklabel is not supported even if accessible. Of
* course, the reserved area is still write protected.
*/
ops = sp->ds_ops;
if (ops->op_getpartbounds(ssp, lp, part,
&slicerel_secno, &endsecno)) {
kprintf("dscheck(%s): partition %d out of bounds\n",
devtoname(dev), part);
goto bad;
}
slicerel_secno += secno;
} else {
/*
* Attempt to access partition when no disklabel present
*/
kprintf("dscheck(%s): attempt to access non-existent partition\n",
devtoname(dev));
goto bad;
}
/*
* Disallow writes to reserved areas unless ds_wlabel allows it.
* If the reserved area is written to request a reprobe of the
* disklabel when the slice is closed.
*/
if (slicerel_secno < sp->ds_reserved && nsec &&
bp->b_cmd == BUF_CMD_WRITE) {
if (sp->ds_wlabel == 0) {
bp->b_error = EROFS;
goto error;
}
sp->ds_flags |= DSF_REPROBE;
}
/*
* If we get here, bio_offset must be on a block boundary and
* the sector size must be a power of 2.
*/
if ((bio->bio_offset & (ssp->dss_secsize - 1)) ||
(ssp->dss_secsize ^ (ssp->dss_secsize - 1)) !=
((ssp->dss_secsize << 1) - 1)) {
kprintf("%s: invalid BIO offset, not sector aligned or"
" invalid sector size (not power of 2) %08llx %d\n",
devtoname(dev), (long long)bio->bio_offset,
ssp->dss_secsize);
goto bad;
}
/*
* EOF handling
*/
if (secno + nsec > endsecno) {
/*
* Return an error if beyond the end of the disk, or
* if B_BNOCLIP is set. Tell the system that we do not
* need to keep the buffer around.
*/
if (secno > endsecno || (bp->b_flags & B_BNOCLIP))
goto bad;
/*
* If exactly at end of disk, return an EOF. Throw away
* the buffer contents, if any, by setting B_INVAL.
*/
if (secno == endsecno) {
bp->b_resid = bp->b_bcount;
bp->b_flags |= B_INVAL;
goto done;
}
/*
* Else truncate
*/
nsec = endsecno - secno;
bp->b_bcount = nsec * ssp->dss_secsize;
}
nbio = push_bio(bio);
nbio->bio_offset = (off_t)(sp->ds_offset + slicerel_secno) *
ssp->dss_secsize;
return (nbio);
bad_bcount:
kprintf(
"dscheck(%s): b_bcount %d is not on a sector boundary (ssize %d)\n",
devtoname(dev), bp->b_bcount, ssp->dss_secsize);
goto bad;
bad_blkno:
kprintf(
"dscheck(%s): bio_offset %lld is not on a sector boundary (ssize %d)\n",
devtoname(dev), (long long)bio->bio_offset, ssp->dss_secsize);
bad:
bp->b_error = EINVAL;
/* fall through */
error:
/*
* Terminate the I/O with a ranging error. Since the buffer is
* either illegal or beyond the file EOF, mark it B_INVAL as well.
*/
bp->b_resid = bp->b_bcount;
bp->b_flags |= B_ERROR | B_INVAL;
done:
/*
* Caller must biodone() the originally passed bio if NULL is
* returned.
*/
return (NULL);
}
/*
* dsclose() - close a cooked disk slice.
*
* WARNING! The passed diskslices and related diskslice structures may
* be invalidated or replaced by this function, callers must
* reload from the disk structure for continued access.
*/
void
dsclose(cdev_t dev, int mode, struct diskslices *ssp)
{
u_int32_t part;
u_int32_t slice;
struct diskslice *sp;
slice = dkslice(dev);
part = dkpart(dev);
if (slice < ssp->dss_nslices) {
sp = &ssp->dss_slices[slice];
dsclrmask(sp, part);
if (sp->ds_flags & DSF_REPROBE) {
sp->ds_flags &= ~DSF_REPROBE;
if (slice == WHOLE_DISK_SLICE) {
disk_msg_send_sync(DISK_DISK_REPROBE,
dev->si_disk, NULL);
devfs_config();
} else {
disk_msg_send_sync(DISK_SLICE_REPROBE,
dev->si_disk, sp);
devfs_config();
}
/* ssp and sp may both be invalid after reprobe */
}
}
}
void
dsgone(struct diskslices **sspp)
{
int slice;
struct diskslice *sp;
struct diskslices *ssp;
if ((ssp = *sspp) != NULL) {
for (slice = 0; slice < ssp->dss_nslices; slice++) {
sp = &ssp->dss_slices[slice];
free_ds_label(ssp, slice);
}
kfree(ssp, M_DEVBUF);
*sspp = NULL;
}
}
/*
* For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
* is subject to the same restriction as dsopen().
*/
int
dsioctl(cdev_t dev, u_long cmd, caddr_t data, int flags,
struct diskslices **sspp, struct disk_info *info)
{
int error;
disklabel_t lp;
disklabel_t lptmp;
disklabel_ops_t ops;
int old_wlabel;
u_int32_t openmask[DKMAXPARTITIONS/(sizeof(u_int32_t)*8)];
int part;
int slice;
struct diskslice *sp;
struct diskslices *ssp;
slice = dkslice(dev);
part = dkpart(dev);
ssp = *sspp;
if (slice >= ssp->dss_nslices)
return (EINVAL);
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
ops = sp->ds_ops; /* may be NULL if no label */
switch (cmd) {
case DIOCGDVIRGIN32:
ops = &disklabel32_ops;
/* fall through */
case DIOCGDVIRGIN64:
if (cmd != DIOCGDVIRGIN32)
ops = &disklabel64_ops;
/*
* You can only retrieve a virgin disklabel on the whole
* disk slice or whole-slice partition.
*/
if (slice != WHOLE_DISK_SLICE &&
part != WHOLE_SLICE_PART) {
return(EINVAL);
}
lp.opaque = data;
ops->op_makevirginlabel(lp, ssp, sp, info);
return (0);
case DIOCGDINFO32:
case DIOCGDINFO64:
/*
* You can only retrieve a disklabel on the whole
* slice partition.
*
* We do not support labels directly on whole-disks
* any more (that is, disks without slices), unless the
* device driver has asked for a compatible label (e.g.
* for a CD) to allow booting off of storage that is
* otherwise unlabeled.
*/
error = 0;
if (part != WHOLE_SLICE_PART)
return(EINVAL);
if (slice == WHOLE_DISK_SLICE &&
(info->d_dsflags & DSO_COMPATLABEL) == 0) {
return (ENODEV);
}
if (sp->ds_label.opaque == NULL) {
error = dsreadandsetlabel(dev, info->d_dsflags,
ssp, sp, info);
ops = sp->ds_ops; /* may be NULL */
}
/*
* The type of label we found must match the type of
* label requested.
*/
if (error == 0 && IOCPARM_LEN(cmd) != ops->labelsize)
error = ENOATTR;
if (error == 0)
bcopy(sp->ds_label.opaque, data, ops->labelsize);
return (error);
case DIOCGPART:
{
struct partinfo *dpart = (void *)data;
/*
* The disk management layer may not have read the
* disklabel yet because simply opening a slice no
* longer 'probes' the disk that way. Be sure we
* have tried.
*
* We ignore any error.
*/
if (sp->ds_label.opaque == NULL &&
part == WHOLE_SLICE_PART &&
slice != WHOLE_DISK_SLICE) {
dsreadandsetlabel(dev, info->d_dsflags,
ssp, sp, info);
ops = sp->ds_ops; /* may be NULL */
}
bzero(dpart, sizeof(*dpart));
dpart->media_offset = (u_int64_t)sp->ds_offset *
info->d_media_blksize;
dpart->media_size = (u_int64_t)sp->ds_size *
info->d_media_blksize;
dpart->media_blocks = sp->ds_size;
dpart->media_blksize = info->d_media_blksize;
dpart->reserved_blocks= sp->ds_reserved;
dpart->fstype_uuid = sp->ds_type_uuid;
dpart->storage_uuid = sp->ds_stor_uuid;
if (slice != WHOLE_DISK_SLICE &&
part != WHOLE_SLICE_PART) {
u_int64_t start;
u_int64_t blocks;
if (lp.opaque == NULL)
return(EINVAL);
if (ops->op_getpartbounds(ssp, lp, part,
&start, &blocks)) {
return(EINVAL);
}
ops->op_loadpartinfo(lp, part, dpart);
dpart->media_offset += start *
info->d_media_blksize;
dpart->media_size = blocks *
info->d_media_blksize;
dpart->media_blocks = blocks;
/*
* partition starting sector (p_offset)
* requires slice's reserved areas to be
* adjusted.
*/
if (dpart->reserved_blocks > start)
dpart->reserved_blocks -= start;
else
dpart->reserved_blocks = 0;
}
/*
* Load remaining fields from the info structure
*/
dpart->d_nheads = info->d_nheads;
dpart->d_ncylinders = info->d_ncylinders;
dpart->d_secpertrack = info->d_secpertrack;
dpart->d_secpercyl = info->d_secpercyl;
}
return (0);
case DIOCGSLICEINFO:
bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] -
(char *)ssp);
return (0);
case DIOCSDINFO32:
ops = &disklabel32_ops;
/* fall through */
case DIOCSDINFO64:
if (cmd != DIOCSDINFO32)
ops = &disklabel64_ops;
/*
* You can write a disklabel on the whole disk slice or
* whole-slice partition.
*/
if (slice != WHOLE_DISK_SLICE &&
part != WHOLE_SLICE_PART) {
return(EINVAL);
}
/*
* We no longer support writing disklabels directly to media
* without there being a slice. Keep this as a separate
* conditional.
*/
if (slice == WHOLE_DISK_SLICE)
return (ENODEV);
if (!(flags & FWRITE))
return (EBADF);
/*
* If an existing label is present it must be the same
* type as the label being passed by the ioctl.
*/
if (sp->ds_label.opaque && sp->ds_ops != ops)
return (ENOATTR);
/*
* Create a temporary copy of the existing label
* (if present) so setdisklabel can compare it against
* the new label.
*/
lp.opaque = kmalloc(ops->labelsize, M_DEVBUF, M_WAITOK);
if (sp->ds_label.opaque == NULL)
bzero(lp.opaque, ops->labelsize);
else
bcopy(sp->ds_label.opaque, lp.opaque, ops->labelsize);
if (sp->ds_label.opaque == NULL) {
bzero(openmask, sizeof(openmask));
} else {
bcopy(sp->ds_openmask, openmask, sizeof(openmask));
}
lptmp.opaque = data;
error = ops->op_setdisklabel(lp, lptmp, ssp, sp, openmask);
disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp);
devfs_config();
if (error != 0) {
kfree(lp.opaque, M_DEVBUF);
return (error);
}
free_ds_label(ssp, slice);
set_ds_label(ssp, slice, lp, ops);
return (0);
case DIOCSYNCSLICEINFO:
/*
* This ioctl can only be done on the whole disk
*/
if (slice != WHOLE_DISK_SLICE || part != WHOLE_SLICE_PART)
return (EINVAL);
if (*(int *)data == 0) {
for (slice = 0; slice < ssp->dss_nslices; slice++) {
struct diskslice *ds = &ssp->dss_slices[slice];
switch(dscountmask(ds)) {
case 0:
break;
case 1:
if (slice != WHOLE_DISK_SLICE)
return (EBUSY);
if (!dschkmask(ds, RAW_PART))
return (EBUSY);
break;
default:
return (EBUSY);
}
}
}
disk_msg_send_sync(DISK_DISK_REPROBE, dev->si_disk, NULL);
devfs_config();
return 0;
case DIOCWDINFO32:
case DIOCWDINFO64:
error = dsioctl(dev, ((cmd == DIOCWDINFO32) ?
DIOCSDINFO32 : DIOCSDINFO64),
data, flags, &ssp, info);
if (error == 0 && sp->ds_label.opaque == NULL)
error = EINVAL;
if (part != WHOLE_SLICE_PART)
error = EINVAL;
if (error != 0)
return (error);
/*
* Allow the reserved area to be written, reload ops
* because the DIOCSDINFO op above may have installed
* a new label type.
*/
ops = sp->ds_ops;
old_wlabel = sp->ds_wlabel;
set_ds_wlabel(ssp, slice, TRUE);
error = ops->op_writedisklabel(dev, ssp, sp, sp->ds_label);
disk_msg_send_sync(DISK_SLICE_REPROBE, dev->si_disk, sp);
devfs_config();
set_ds_wlabel(ssp, slice, old_wlabel);
/* XXX should invalidate in-core label if write failed. */
return (error);
case DIOCWLABEL:
if (slice == WHOLE_DISK_SLICE)
return (ENODEV);
if (!(flags & FWRITE))
return (EBADF);
set_ds_wlabel(ssp, slice, *(int *)data != 0);
return (0);
default:
return (ENOIOCTL);
}
}
int
dsisopen(struct diskslices *ssp)
{
int slice;
if (ssp == NULL)
return (0);
for (slice = 0; slice < ssp->dss_nslices; slice++) {
if (dscountmask(&ssp->dss_slices[slice]))
return (1);
}
return (0);
}
/*
* Allocate a slices "struct" and initialize it to contain only an empty
* compatibility slice (pointing to itself), a whole disk slice (covering
* the disk as described by the label), and (nslices - BASE_SLICES) empty
* slices beginning at BASE_SLICE.
*
* Note that the compatibility slice is no longer really a compatibility
* slice. It is slice 0 if a GPT label is present, and the dangerously
* dedicated slice if no slice table otherwise exists. Else it is 0-sized.
*/
struct diskslices *
dsmakeslicestruct(int nslices, struct disk_info *info)
{
struct diskslice *sp;
struct diskslices *ssp;
ssp = kmalloc(offsetof(struct diskslices, dss_slices) +
nslices * sizeof *sp, M_DEVBUF, M_WAITOK);
ssp->dss_first_bsd_slice = COMPATIBILITY_SLICE;
ssp->dss_nslices = nslices;
ssp->dss_oflags = 0;
/*
* Figure out if we can use shifts or whether we have to
* use mod/multply to translate byte offsets into sector numbers.
*/
if ((info->d_media_blksize ^ (info->d_media_blksize - 1)) ==
(info->d_media_blksize << 1) - 1) {
ssp->dss_secmult = info->d_media_blksize / DEV_BSIZE;
if (ssp->dss_secmult & (ssp->dss_secmult - 1))
ssp->dss_secshift = -1;
else
ssp->dss_secshift = ffs(ssp->dss_secmult) - 1;
} else {
ssp->dss_secmult = 0;
ssp->dss_secshift = -1;
}
ssp->dss_secsize = info->d_media_blksize;
sp = &ssp->dss_slices[0];
bzero(sp, nslices * sizeof *sp);
sp[WHOLE_DISK_SLICE].ds_size = info->d_media_blocks;
return (ssp);
}
char *
dsname(cdev_t dev, int unit, int slice, int part, char *partname)
{
return dev->si_name;
}
/*
* This should only be called when the unit is inactive and the strategy
* routine should not allow it to become active unless we call it. Our
* strategy routine must be special to allow activity.
*/
int
dsopen(cdev_t dev, int mode, u_int flags,
struct diskslices **sspp, struct disk_info *info)
{
struct diskslice *sp;
struct diskslices *ssp;
int slice;
int part;
ssp = *sspp;
dev->si_bsize_phys = info->d_media_blksize;
slice = dkslice(dev);
part = dkpart(dev);
sp = &ssp->dss_slices[slice];
dssetmask(sp, part);
return 0;
}
/*
* Attempt to read the disklabel. If successful, store it in sp->ds_label.
*
* If we cannot read the disklabel and DSO_COMPATLABEL is set, we construct
* a fake label covering the whole disk.
*/
static
int
dsreadandsetlabel(cdev_t dev, u_int flags,
struct diskslices *ssp, struct diskslice *sp,
struct disk_info *info)
{
disklabel_t lp;
disklabel_ops_t ops;
const char *msg;
const char *sname;
char partname[2];
int slice = dkslice(dev);
/*
* Probe the disklabel
*/
lp.opaque = NULL;
sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART, partname);
ops = &disklabel32_ops;
msg = ops->op_readdisklabel(dev, sp, &lp, info);
if (msg && strcmp(msg, "no disk label") == 0) {
ops = &disklabel64_ops;
msg = disklabel64_ops.op_readdisklabel(dev, sp, &lp, info);
}
/*
* If we failed and COMPATLABEL is set, create a dummy disklabel.
*/
if (msg != NULL && (flags & DSO_COMPATLABEL)) {
msg = NULL;
if (sp->ds_size >= 0x100000000ULL)
ops = &disklabel64_ops;
else
ops = &disklabel32_ops;
lp = ops->op_clone_label(info, sp);
}
if (msg != NULL) {
if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
log(LOG_WARNING, "%s: cannot find label (%s)\n",
sname, msg);
if (lp.opaque)
kfree(lp.opaque, M_DEVBUF);
} else {
set_ds_label(ssp, slice, lp, ops);
set_ds_wlabel(ssp, slice, FALSE);
}
return (msg ? EINVAL : 0);
}
int64_t
dssize(cdev_t dev, struct diskslices **sspp)
{
disklabel_t lp;
disklabel_ops_t ops;
int part;
int slice;
struct diskslices *ssp;
u_int64_t start;
u_int64_t blocks;
slice = dkslice(dev);
part = dkpart(dev);
ssp = *sspp;
if (ssp == NULL || slice >= ssp->dss_nslices
|| !dschkmask(&ssp->dss_slices[slice], part)) {
if (dev_dopen(dev, FREAD, S_IFCHR, proc0.p_ucred) != 0)
return (-1);
dev_dclose(dev, FREAD, S_IFCHR);
ssp = *sspp;
}
lp = ssp->dss_slices[slice].ds_label;
if (lp.opaque == NULL)
return (-1);
ops = ssp->dss_slices[slice].ds_ops;
if (ops->op_getpartbounds(ssp, lp, part, &start, &blocks))
return (-1);
return ((int64_t)blocks);
}
static void
free_ds_label(struct diskslices *ssp, int slice)
{
struct diskslice *sp;
disklabel_t lp;
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
if (lp.opaque != NULL) {
kfree(lp.opaque, M_DEVBUF);
lp.opaque = NULL;
set_ds_label(ssp, slice, lp, NULL);
}
}
static void
set_ds_label(struct diskslices *ssp, int slice,
disklabel_t lp, disklabel_ops_t ops)
{
struct diskslice *sp = &ssp->dss_slices[slice];
sp->ds_label = lp;
sp->ds_ops = ops;
if (lp.opaque && slice != WHOLE_DISK_SLICE)
ops->op_adjust_label_reserved(ssp, slice, sp);
else
sp->ds_reserved = 0;
}
static void
set_ds_wlabel(struct diskslices *ssp, int slice, int wlabel)
{
ssp->dss_slices[slice].ds_wlabel = wlabel;
}