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freebsd/sys/kern/subr_diskslice.c
Jordan K. Hubbard e7c2b5a51d Add a new ioctl for doing virgin disklabels. 
Submitted by:	dillon
2000-10-31 07:05:40 +00:00

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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 $
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/conf.h>
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/vnode.h>
#include <ufs/ffs/fs.h>
#define TRACE(str) do { if (ds_debug) printf str; } while (0)
typedef u_char bool_t;
static volatile bool_t ds_debug;
static struct disklabel *clone_label __P((struct disklabel *lp));
static void dsiodone __P((struct bio *bp));
static char *fixlabel __P((char *sname, struct diskslice *sp,
struct disklabel *lp, int writeflag));
static void free_ds_label __P((struct diskslices *ssp, int slice));
static void partition_info __P((char *sname, int part, struct partition *pp));
static void slice_info __P((char *sname, struct diskslice *sp));
static void set_ds_label __P((struct diskslices *ssp, int slice,
struct disklabel *lp));
static void set_ds_labeldevs __P((dev_t dev, struct diskslices *ssp));
static void set_ds_wlabel __P((struct diskslices *ssp, int slice,
int wlabel));
/*
* Duplicate a label for the whole disk, and initialize defaults in the
* copy for fields that are not already initialized. The caller only
* needs to initialize d_secsize and d_secperunit, and zero the fields
* that are to be defaulted.
*/
static struct disklabel *
clone_label(lp)
struct disklabel *lp;
{
struct disklabel *lp1;
lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
*lp1 = *lp;
lp = NULL;
if (lp1->d_typename[0] == '\0')
strncpy(lp1->d_typename, "amnesiac", sizeof(lp1->d_typename));
if (lp1->d_packname[0] == '\0')
strncpy(lp1->d_packname, "fictitious", sizeof(lp1->d_packname));
if (lp1->d_nsectors == 0)
lp1->d_nsectors = 32;
if (lp1->d_ntracks == 0)
lp1->d_ntracks = 64;
lp1->d_secpercyl = lp1->d_nsectors * lp1->d_ntracks;
lp1->d_ncylinders = lp1->d_secperunit / lp1->d_secpercyl;
if (lp1->d_rpm == 0)
lp1->d_rpm = 3600;
if (lp1->d_interleave == 0)
lp1->d_interleave = 1;
if (lp1->d_npartitions < RAW_PART + 1)
lp1->d_npartitions = MAXPARTITIONS;
if (lp1->d_bbsize == 0)
lp1->d_bbsize = BBSIZE;
if (lp1->d_sbsize == 0)
lp1->d_sbsize = SBSIZE;
lp1->d_partitions[RAW_PART].p_size = lp1->d_secperunit;
lp1->d_magic = DISKMAGIC;
lp1->d_magic2 = DISKMAGIC;
lp1->d_checksum = dkcksum(lp1);
return (lp1);
}
/*
* 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.
*/
int
dscheck(bp, ssp)
struct bio *bp;
struct diskslices *ssp;
{
daddr_t blkno;
u_long endsecno;
daddr_t labelsect;
struct disklabel *lp;
char *msg;
long nsec;
struct partition *pp;
daddr_t secno;
daddr_t slicerel_secno;
struct diskslice *sp;
blkno = bp->bio_blkno;
if (blkno < 0) {
printf("dscheck(%s): negative bio_blkno %ld\n",
devtoname(bp->bio_dev), (long)blkno);
bp->bio_error = EINVAL;
goto bad;
}
sp = &ssp->dss_slices[dkslice(bp->bio_dev)];
lp = sp->ds_label;
if (ssp->dss_secmult == 1) {
if (bp->bio_bcount % (u_long)DEV_BSIZE)
goto bad_bcount;
secno = blkno;
nsec = bp->bio_bcount >> DEV_BSHIFT;
} else if (ssp->dss_secshift != -1) {
if (bp->bio_bcount & (ssp->dss_secsize - 1))
goto bad_bcount;
if (blkno & (ssp->dss_secmult - 1))
goto bad_blkno;
secno = blkno >> ssp->dss_secshift;
nsec = bp->bio_bcount >> (DEV_BSHIFT + ssp->dss_secshift);
} else {
if (bp->bio_bcount % ssp->dss_secsize)
goto bad_bcount;
if (blkno % ssp->dss_secmult)
goto bad_blkno;
secno = blkno / ssp->dss_secmult;
nsec = bp->bio_bcount / ssp->dss_secsize;
}
if (lp == NULL) {
labelsect = -LABELSECTOR - 1;
endsecno = sp->ds_size;
slicerel_secno = secno;
} else {
labelsect = lp->d_partitions[LABEL_PART].p_offset;
if (labelsect != 0) Debugger("labelsect != 0 in dscheck()");
pp = &lp->d_partitions[dkpart(bp->bio_dev)];
endsecno = pp->p_size;
slicerel_secno = pp->p_offset + secno;
}
/* overwriting disk label ? */
/* XXX should also protect bootstrap in first 8K */
if (slicerel_secno <= LABELSECTOR + labelsect &&
#if LABELSECTOR != 0
slicerel_secno + nsec > LABELSECTOR + labelsect &&
#endif
(bp->bio_cmd == BIO_WRITE) && sp->ds_wlabel == 0) {
bp->bio_error = EROFS;
goto bad;
}
#if defined(DOSBBSECTOR) && defined(notyet)
/* overwriting master boot record? */
if (slicerel_secno <= DOSBBSECTOR && (bp->bio_cmd == BIO_WRITE) &&
sp->ds_wlabel == 0) {
bp->bio_error = EROFS;
goto bad;
}
#endif
/* beyond partition? */
if (secno + nsec > endsecno) {
/* if exactly at end of disk, return an EOF */
if (secno == endsecno) {
bp->bio_resid = bp->bio_bcount;
return (0);
}
/* or truncate if part of it fits */
nsec = endsecno - secno;
if (nsec <= 0) {
bp->bio_error = EINVAL;
goto bad;
}
bp->bio_bcount = nsec * ssp->dss_secsize;
}
bp->bio_pblkno = sp->ds_offset + slicerel_secno;
/*
* Snoop on label accesses if the slice offset is nonzero. Fudge
* offsets in the label to keep the in-core label coherent with
* the on-disk one.
*/
if (slicerel_secno <= LABELSECTOR + labelsect
#if LABELSECTOR != 0
&& slicerel_secno + nsec > LABELSECTOR + labelsect
#endif
&& sp->ds_offset != 0) {
struct iodone_chain *ic;
ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK);
ic->ic_prev_flags = bp->bio_flags;
ic->ic_prev_iodone = bp->bio_done;
ic->ic_prev_iodone_chain = bp->bio_done_chain;
ic->ic_args[0].ia_long = (LABELSECTOR + labelsect -
slicerel_secno) * ssp->dss_secsize;
ic->ic_args[1].ia_ptr = sp;
bp->bio_done = dsiodone;
bp->bio_done_chain = ic;
if (!(bp->bio_cmd == BIO_READ)) {
/*
* XXX even disklabel(8) writes directly so we need
* to adjust writes. Perhaps we should drop support
* for DIOCWLABEL (always write protect labels) and
* require the use of DIOCWDINFO.
*
* XXX probably need to copy the data to avoid even
* temporarily corrupting the in-core copy.
*/
/* XXX need name here. */
msg = fixlabel((char *)NULL, sp,
(struct disklabel *)
(bp->bio_data + ic->ic_args[0].ia_long),
TRUE);
if (msg != NULL) {
printf("dscheck(%s): %s\n",
devtoname(bp->bio_dev), msg);
bp->bio_error = EROFS;
goto bad;
}
}
}
return (1);
bad_bcount:
printf(
"dscheck(%s): bio_bcount %ld is not on a sector boundary (ssize %d)\n",
devtoname(bp->bio_dev), bp->bio_bcount, ssp->dss_secsize);
bp->bio_error = EINVAL;
goto bad;
bad_blkno:
printf(
"dscheck(%s): bio_blkno %ld is not on a sector boundary (ssize %d)\n",
devtoname(bp->bio_dev), (long)blkno, ssp->dss_secsize);
bp->bio_error = EINVAL;
goto bad;
bad:
bp->bio_resid = bp->bio_bcount;
bp->bio_flags |= BIO_ERROR;
return (-1);
}
void
dsclose(dev, mode, ssp)
dev_t dev;
int mode;
struct diskslices *ssp;
{
u_char mask;
struct diskslice *sp;
sp = &ssp->dss_slices[dkslice(dev)];
mask = 1 << dkpart(dev);
sp->ds_openmask &= ~mask;
}
void
dsgone(sspp)
struct diskslices **sspp;
{
int slice;
struct diskslice *sp;
struct diskslices *ssp;
for (slice = 0, ssp = *sspp; slice < ssp->dss_nslices; slice++) {
sp = &ssp->dss_slices[slice];
free_ds_label(ssp, slice);
}
free(ssp, M_DEVBUF);
*sspp = NULL;
}
/*
* For the "write" commands (DIOCSDINFO and DIOCWDINFO), this
* is subject to the same restriction as dsopen().
*/
int
dsioctl(dev, cmd, data, flags, sspp)
dev_t dev;
u_long cmd;
caddr_t data;
int flags;
struct diskslices **sspp;
{
int error;
struct disklabel *lp;
int old_wlabel;
u_char openmask;
int part;
int slice;
struct diskslice *sp;
struct diskslices *ssp;
struct partition *pp;
slice = dkslice(dev);
ssp = *sspp;
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
switch (cmd) {
case DIOCGDVIRGIN:
lp = (struct disklabel *)data;
if (ssp->dss_slices[WHOLE_DISK_SLICE].ds_label) {
*lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
} else {
bzero(lp, sizeof(struct disklabel));
}
lp->d_magic = DISKMAGIC;
lp->d_magic2 = DISKMAGIC;
pp = &lp->d_partitions[RAW_PART];
pp->p_offset = 0;
pp->p_size = sp->ds_size;
lp->d_npartitions = MAXPARTITIONS;
if (lp->d_interleave == 0)
lp->d_interleave = 1;
if (lp->d_rpm == 0)
lp->d_rpm = 3600;
if (lp->d_nsectors == 0)
lp->d_nsectors = 32;
if (lp->d_ntracks == 0)
lp->d_ntracks = 64;
lp->d_bbsize = BBSIZE;
lp->d_sbsize = SBSIZE;
lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
lp->d_secperunit = sp->ds_size;
lp->d_checksum = 0;
lp->d_checksum = dkcksum(lp);
return (0);
case DIOCGDINFO:
if (lp == NULL)
return (EINVAL);
*(struct disklabel *)data = *lp;
return (0);
#ifdef notyet
case DIOCGDINFOP:
if (lp == NULL)
return (EINVAL);
*(struct disklabel **)data = lp;
return (0);
#endif
case DIOCGPART:
if (lp == NULL)
return (EINVAL);
((struct partinfo *)data)->disklab = lp;
((struct partinfo *)data)->part
= &lp->d_partitions[dkpart(dev)];
return (0);
case DIOCGSLICEINFO:
bcopy(ssp, data, (char *)&ssp->dss_slices[ssp->dss_nslices] -
(char *)ssp);
return (0);
case DIOCSDINFO:
if (slice == WHOLE_DISK_SLICE)
return (ENODEV);
if (!(flags & FWRITE))
return (EBADF);
lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
if (sp->ds_label == NULL)
bzero(lp, sizeof *lp);
else
bcopy(sp->ds_label, lp, sizeof *lp);
if (sp->ds_label == NULL)
openmask = 0;
else {
openmask = sp->ds_openmask;
if (slice == COMPATIBILITY_SLICE)
openmask |= ssp->dss_slices[
ssp->dss_first_bsd_slice].ds_openmask;
else if (slice == ssp->dss_first_bsd_slice)
openmask |= ssp->dss_slices[
COMPATIBILITY_SLICE].ds_openmask;
}
error = setdisklabel(lp, (struct disklabel *)data,
(u_long)openmask);
/* XXX why doesn't setdisklabel() check this? */
if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0)
error = EXDEV;
if (error == 0) {
if (lp->d_secperunit > sp->ds_size)
error = ENOSPC;
for (part = 0; part < lp->d_npartitions; part++)
if (lp->d_partitions[part].p_size > sp->ds_size)
error = ENOSPC;
}
if (error != 0) {
free(lp, M_DEVBUF);
return (error);
}
free_ds_label(ssp, slice);
set_ds_label(ssp, slice, lp);
set_ds_labeldevs(dev, ssp);
return (0);
case DIOCSYNCSLICEINFO:
if (slice != WHOLE_DISK_SLICE || dkpart(dev) != RAW_PART)
return (EINVAL);
if (!*(int *)data)
for (slice = 0; slice < ssp->dss_nslices; slice++) {
openmask = ssp->dss_slices[slice].ds_openmask;
if (openmask
&& (slice != WHOLE_DISK_SLICE
|| openmask & ~(1 << RAW_PART)))
return (EBUSY);
}
/*
* Temporarily forget the current slices struct and read
* the current one.
* XXX should wait for current accesses on this disk to
* complete, then lock out future accesses and opens.
*/
*sspp = NULL;
lp = malloc(sizeof *lp, M_DEVBUF, M_WAITOK);
*lp = *ssp->dss_slices[WHOLE_DISK_SLICE].ds_label;
error = dsopen(dev, S_IFCHR, ssp->dss_oflags, sspp, lp);
if (error != 0) {
free(lp, M_DEVBUF);
*sspp = ssp;
return (error);
}
/*
* Reopen everything. This is a no-op except in the "force"
* case and when the raw bdev and cdev are both open. Abort
* if anything fails.
*/
for (slice = 0; slice < ssp->dss_nslices; slice++) {
for (openmask = ssp->dss_slices[slice].ds_openmask,
part = 0; openmask; openmask >>= 1, part++) {
if (!(openmask & 1))
continue;
error = dsopen(dkmodslice(dkmodpart(dev, part),
slice),
S_IFCHR, ssp->dss_oflags, sspp,
lp);
if (error != 0) {
free(lp, M_DEVBUF);
*sspp = ssp;
return (EBUSY);
}
}
}
free(lp, M_DEVBUF);
dsgone(&ssp);
return (0);
case DIOCWDINFO:
error = dsioctl(dev, DIOCSDINFO, data, flags, &ssp);
if (error != 0)
return (error);
/*
* XXX this used to hack on dk_openpart to fake opening
* partition 0 in case that is used instead of dkpart(dev).
*/
old_wlabel = sp->ds_wlabel;
set_ds_wlabel(ssp, slice, TRUE);
error = writedisklabel(dev, sp->ds_label);
/* XXX should invalidate in-core label if write failed. */
set_ds_wlabel(ssp, slice, old_wlabel);
return (error);
case DIOCWLABEL:
#ifndef __alpha__
if (slice == WHOLE_DISK_SLICE)
return (ENODEV);
#endif
if (!(flags & FWRITE))
return (EBADF);
set_ds_wlabel(ssp, slice, *(int *)data != 0);
return (0);
default:
return (ENOIOCTL);
}
}
static void
dsiodone(bp)
struct bio *bp;
{
struct iodone_chain *ic;
char *msg;
ic = bp->bio_done_chain;
bp->bio_done = ic->ic_prev_iodone;
bp->bio_done_chain = ic->ic_prev_iodone_chain;
if (!(bp->bio_cmd == BIO_READ)
|| (!(bp->bio_flags & BIO_ERROR) && bp->bio_error == 0)) {
msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr,
(struct disklabel *)
(bp->bio_data + ic->ic_args[0].ia_long),
FALSE);
if (msg != NULL)
printf("%s\n", msg);
}
free(ic, M_DEVBUF);
biodone(bp);
}
int
dsisopen(ssp)
struct diskslices *ssp;
{
int slice;
if (ssp == NULL)
return (0);
for (slice = 0; slice < ssp->dss_nslices; slice++)
if (ssp->dss_slices[slice].ds_openmask)
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.
*/
struct diskslices *
dsmakeslicestruct(nslices, lp)
int nslices;
struct disklabel *lp;
{
struct diskslice *sp;
struct diskslices *ssp;
ssp = malloc(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;
ssp->dss_secmult = lp->d_secsize / DEV_BSIZE;
if (ssp->dss_secmult & (ssp->dss_secmult - 1))
ssp->dss_secshift = -1;
else
ssp->dss_secshift = ffs(ssp->dss_secmult) - 1;
ssp->dss_secsize = lp->d_secsize;
sp = &ssp->dss_slices[0];
bzero(sp, nslices * sizeof *sp);
sp[WHOLE_DISK_SLICE].ds_size = lp->d_secperunit;
return (ssp);
}
char *
dsname(dev, unit, slice, part, partname)
dev_t dev;
int unit;
int slice;
int part;
char *partname;
{
static char name[32];
const char *dname;
dname = devsw(dev)->d_name;
if (strlen(dname) > 16)
dname = "nametoolong";
snprintf(name, sizeof(name), "%s%d", dname, unit);
partname[0] = '\0';
if (slice != WHOLE_DISK_SLICE || part != RAW_PART) {
partname[0] = 'a' + part;
partname[1] = '\0';
if (slice != COMPATIBILITY_SLICE)
snprintf(name + strlen(name),
sizeof(name) - strlen(name), "s%d", slice - 1);
}
return (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(dev, mode, flags, sspp, lp)
dev_t dev;
int mode;
u_int flags;
struct diskslices **sspp;
struct disklabel *lp;
{
dev_t dev1;
int error;
struct disklabel *lp1;
char *msg;
u_char mask;
bool_t need_init;
int part;
char partname[2];
int slice;
char *sname;
struct diskslice *sp;
struct diskslices *ssp;
int unit;
dev->si_bsize_phys = lp->d_secsize;
unit = dkunit(dev);
if (lp->d_secsize % DEV_BSIZE) {
printf("%s: invalid sector size %lu\n", devtoname(dev),
(u_long)lp->d_secsize);
return (EINVAL);
}
/*
* XXX reinitialize the slice table unless there is an open device
* on the unit. This should only be done if the media has changed.
*/
ssp = *sspp;
need_init = !dsisopen(ssp);
if (ssp != NULL && need_init)
dsgone(sspp);
if (need_init) {
/*
* Allocate a minimal slices "struct". This will become
* the final slices "struct" if we don't want real slices
* or if we can't find any real slices.
*/
*sspp = dsmakeslicestruct(BASE_SLICE, lp);
if (!(flags & DSO_ONESLICE)) {
TRACE(("dsinit\n"));
error = dsinit(dev, lp, sspp);
if (error != 0) {
dsgone(sspp);
return (error);
}
}
ssp = *sspp;
ssp->dss_oflags = flags;
/*
* If there are no real slices, then make the compatiblity
* slice cover the whole disk.
*/
if (ssp->dss_nslices == BASE_SLICE)
ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
= lp->d_secperunit;
/* Point the compatibility slice at the BSD slice, if any. */
for (slice = BASE_SLICE; slice < ssp->dss_nslices; slice++) {
sp = &ssp->dss_slices[slice];
if (sp->ds_type == DOSPTYP_386BSD /* XXX */) {
ssp->dss_first_bsd_slice = slice;
ssp->dss_slices[COMPATIBILITY_SLICE].ds_offset
= sp->ds_offset;
ssp->dss_slices[COMPATIBILITY_SLICE].ds_size
= sp->ds_size;
ssp->dss_slices[COMPATIBILITY_SLICE].ds_type
= sp->ds_type;
break;
}
}
ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = clone_label(lp);
ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE;
}
/* Initialize secondary info for all slices. */
for (slice = 0; slice < ssp->dss_nslices; slice++) {
sp = &ssp->dss_slices[slice];
if (sp->ds_label != NULL
#ifdef __alpha__
&& slice != WHOLE_DISK_SLICE
#endif
)
continue;
dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice);
sname = dsname(dev, unit, slice, RAW_PART, partname);
/*
* XXX this should probably only be done for the need_init
* case, but there may be a problem with DIOCSYNCSLICEINFO.
*/
set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */
lp1 = clone_label(lp);
TRACE(("readdisklabel\n"));
if (flags & DSO_NOLABELS)
msg = NULL;
else {
msg = readdisklabel(dev1, lp1);
/*
* readdisklabel() returns NULL for success, and an
* error string for failure.
*
* If there isn't a label on the disk, and if the
* DSO_COMPATLABEL is set, we want to use the
* faked-up label provided by the caller.
*
* So we set msg to NULL to indicate that there is
* no failure (since we have a faked-up label),
* free lp1, and then clone it again from lp.
* (In case readdisklabel() modified lp1.)
*/
if (msg != NULL && (flags & DSO_COMPATLABEL)) {
msg = NULL;
free(lp1, M_DEVBUF);
lp1 = clone_label(lp);
}
}
if (msg == NULL)
msg = fixlabel(sname, sp, lp1, FALSE);
if (msg == NULL && lp1->d_secsize != ssp->dss_secsize)
msg = "inconsistent sector size";
if (msg != NULL) {
if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
log(LOG_WARNING, "%s: cannot find label (%s)\n",
sname, msg);
free(lp1, M_DEVBUF);
continue;
}
if (lp1->d_flags & D_BADSECT) {
log(LOG_ERR, "%s: bad sector table not supported\n",
sname);
free(lp1, M_DEVBUF);
continue;
}
set_ds_label(ssp, slice, lp1);
set_ds_labeldevs(dev1, ssp);
set_ds_wlabel(ssp, slice, FALSE);
}
slice = dkslice(dev);
if (slice >= ssp->dss_nslices)
return (ENXIO);
sp = &ssp->dss_slices[slice];
part = dkpart(dev);
if (part != RAW_PART
&& (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions))
return (EINVAL); /* XXX needs translation */
mask = 1 << part;
sp->ds_openmask |= mask;
return (0);
}
int
dssize(dev, sspp)
dev_t dev;
struct diskslices **sspp;
{
struct disklabel *lp;
int part;
int slice;
struct diskslices *ssp;
slice = dkslice(dev);
part = dkpart(dev);
ssp = *sspp;
if (ssp == NULL || slice >= ssp->dss_nslices
|| !(ssp->dss_slices[slice].ds_openmask & (1 << part))) {
if (devsw(dev)->d_open(dev, FREAD, S_IFCHR,
(struct proc *)NULL) != 0)
return (-1);
devsw(dev)->d_close(dev, FREAD, S_IFCHR, (struct proc *)NULL);
ssp = *sspp;
}
lp = ssp->dss_slices[slice].ds_label;
if (lp == NULL)
return (-1);
return ((int)lp->d_partitions[part].p_size);
}
static void
free_ds_label(ssp, slice)
struct diskslices *ssp;
int slice;
{
struct disklabel *lp;
struct diskslice *sp;
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
if (lp == NULL)
return;
free(lp, M_DEVBUF);
set_ds_label(ssp, slice, (struct disklabel *)NULL);
}
static char *
fixlabel(sname, sp, lp, writeflag)
char *sname;
struct diskslice *sp;
struct disklabel *lp;
int writeflag;
{
u_long end;
u_long offset;
int part;
struct partition *pp;
u_long start;
bool_t warned;
/* These errors "can't happen" so don't bother reporting details. */
if (lp->d_magic != DISKMAGIC || lp->d_magic2 != DISKMAGIC)
return ("fixlabel: invalid magic");
if (dkcksum(lp) != 0)
return ("fixlabel: invalid checksum");
pp = &lp->d_partitions[RAW_PART];
if (writeflag) {
start = 0;
offset = sp->ds_offset;
} else {
start = sp->ds_offset;
offset = -sp->ds_offset;
}
if (pp->p_offset != start) {
if (sname != NULL) {
printf(
"%s: rejecting BSD label: raw partition offset != slice offset\n",
sname);
slice_info(sname, sp);
partition_info(sname, RAW_PART, pp);
}
return ("fixlabel: raw partition offset != slice offset");
}
if (pp->p_size != sp->ds_size) {
if (sname != NULL) {
printf("%s: raw partition size != slice size\n", sname);
slice_info(sname, sp);
partition_info(sname, RAW_PART, pp);
}
if (pp->p_size > sp->ds_size) {
if (sname == NULL)
return ("fixlabel: raw partition size > slice size");
printf("%s: truncating raw partition\n", sname);
pp->p_size = sp->ds_size;
}
}
end = start + sp->ds_size;
if (start > end)
return ("fixlabel: slice wraps");
if (lp->d_secpercyl <= 0)
return ("fixlabel: d_secpercyl <= 0");
pp -= RAW_PART;
warned = FALSE;
for (part = 0; part < lp->d_npartitions; part++, pp++) {
if (pp->p_offset != 0 || pp->p_size != 0) {
if (pp->p_offset < start
|| pp->p_offset + pp->p_size > end
|| pp->p_offset + pp->p_size < pp->p_offset) {
if (sname != NULL) {
printf(
"%s: rejecting partition in BSD label: it isn't entirely within the slice\n",
sname);
if (!warned) {
slice_info(sname, sp);
warned = TRUE;
}
partition_info(sname, part, pp);
}
/* XXX else silently discard junk. */
bzero(pp, sizeof *pp);
} else
pp->p_offset += offset;
}
}
lp->d_ncylinders = sp->ds_size / lp->d_secpercyl;
lp->d_secperunit = sp->ds_size;
lp->d_checksum = 0;
lp->d_checksum = dkcksum(lp);
return (NULL);
}
static void
partition_info(sname, part, pp)
char *sname;
int part;
struct partition *pp;
{
printf("%s%c: start %lu, end %lu, size %lu\n", sname, 'a' + part,
(u_long)pp->p_offset, (u_long)(pp->p_offset + pp->p_size - 1),
(u_long)pp->p_size);
}
static void
slice_info(sname, sp)
char *sname;
struct diskslice *sp;
{
printf("%s: start %lu, end %lu, size %lu\n", sname,
sp->ds_offset, sp->ds_offset + sp->ds_size - 1, sp->ds_size);
}
static void
set_ds_label(ssp, slice, lp)
struct diskslices *ssp;
int slice;
struct disklabel *lp;
{
ssp->dss_slices[slice].ds_label = lp;
if (slice == COMPATIBILITY_SLICE)
ssp->dss_slices[ssp->dss_first_bsd_slice].ds_label = lp;
else if (slice == ssp->dss_first_bsd_slice)
ssp->dss_slices[COMPATIBILITY_SLICE].ds_label = lp;
}
static void
set_ds_labeldevs(dev, ssp)
dev_t dev;
struct diskslices *ssp;
{
}
static void
set_ds_wlabel(ssp, slice, wlabel)
struct diskslices *ssp;
int slice;
int wlabel;
{
ssp->dss_slices[slice].ds_wlabel = wlabel;
if (slice == COMPATIBILITY_SLICE)
ssp->dss_slices[ssp->dss_first_bsd_slice].ds_wlabel = wlabel;
else if (slice == ssp->dss_first_bsd_slice)
ssp->dss_slices[COMPATIBILITY_SLICE].ds_wlabel = wlabel;
}
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