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freebsd-skq/sys/kern/subr_diskslice.c
obrien fea3a33427 Discussed with: bde
1998-04-24 11:50:30 +00:00

1085 lines
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#ifdef SLICE
#undef DEVFS
#endif
/*-
* 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 $
* $Id: subr_diskslice.c,v 1.44 1998/04/24 11:49:57 obrien Exp $
*/
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
#include <sys/disklabel.h>
#include <sys/diskslice.h>
#include <sys/dkbad.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/systm.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 void dsiodone __P((struct buf *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));
#ifdef DEVFS
static void free_ds_labeldevs __P((struct diskslices *ssp, int slice));
#endif
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_bad __P((struct diskslices *ssp, int slice,
struct dkbad_intern *btp));
static void set_ds_label __P((struct diskslices *ssp, int slice,
struct disklabel *lp));
#ifdef DEVFS
static void set_ds_labeldevs __P((char *dname, dev_t dev,
struct diskslices *ssp));
static void set_ds_labeldevs_unaliased __P((char *dname, dev_t dev,
struct diskslices *ssp));
#endif
static void set_ds_wlabel __P((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 Do bad sector remapping. May need to split buffer.
* o Split buffers that are too big for the device.
* o Check for overflow.
* o Finish cleaning this up.
*/
int
dscheck(bp, ssp)
struct buf *bp;
struct diskslices *ssp;
{
daddr_t blkno;
daddr_t labelsect;
struct disklabel *lp;
u_long maxsz;
char *msg;
struct partition *pp;
struct diskslice *sp;
long sz;
if (bp->b_blkno < 0) {
Debugger("Slice code got negative blocknumber");
bp->b_error = EINVAL;
goto bad;
}
sp = &ssp->dss_slices[dkslice(bp->b_dev)];
lp = sp->ds_label;
sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
if (lp == NULL) {
blkno = bp->b_blkno;
labelsect = -LABELSECTOR - 1;
maxsz = sp->ds_size;
} else {
labelsect = lp->d_partitions[LABEL_PART].p_offset;
if (labelsect != 0) Debugger("labelsect != 0 in dscheck()");
pp = &lp->d_partitions[dkpart(bp->b_dev)];
blkno = pp->p_offset + bp->b_blkno;
maxsz = pp->p_size;
if (sp->ds_bad != NULL && ds_debug) {
daddr_t newblkno;
newblkno = transbad144(sp->ds_bad, blkno);
if (newblkno != blkno)
printf("should map bad block %lu -> %lu\n",
blkno, newblkno);
}
}
/* overwriting disk label ? */
/* XXX should also protect bootstrap in first 8K */
if (blkno <= LABELSECTOR + labelsect &&
#if LABELSECTOR != 0
bp->b_blkno + sz > LABELSECTOR + labelsect &&
#endif
(bp->b_flags & B_READ) == 0 && sp->ds_wlabel == 0) {
bp->b_error = EROFS;
goto bad;
}
#if defined(DOSBBSECTOR) && defined(notyet)
/* overwriting master boot record? */
if (blkno <= DOSBBSECTOR && (bp->b_flags & B_READ) == 0 &&
sp->ds_wlabel == 0) {
bp->b_error = EROFS;
goto bad;
}
#endif
/* beyond partition? */
if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
/* if exactly at end of disk, return an EOF */
if (bp->b_blkno == maxsz) {
bp->b_resid = bp->b_bcount;
return (0);
}
/* or truncate if part of it fits */
sz = maxsz - bp->b_blkno;
if (sz <= 0) {
bp->b_error = EINVAL;
goto bad;
}
bp->b_bcount = sz << DEV_BSHIFT;
}
bp->b_pblkno = blkno + sp->ds_offset;
/*
* 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 (blkno <= LABELSECTOR + labelsect
#if LABELSECTOR != 0
&& bp->b_blkno + sz > LABELSECTOR + labelsect
#endif
&& sp->ds_offset != 0) {
struct iodone_chain *ic;
ic = malloc(sizeof *ic , M_DEVBUF, M_WAITOK);
ic->ic_prev_flags = bp->b_flags;
ic->ic_prev_iodone = bp->b_iodone;
ic->ic_prev_iodone_chain = bp->b_iodone_chain;
ic->ic_args[0].ia_long = (LABELSECTOR + labelsect - blkno)
<< DEV_BSHIFT;
if (lp)
ic->ic_args[0].ia_long *= lp->d_secsize / DEV_BSIZE;
ic->ic_args[1].ia_ptr = sp;
bp->b_flags |= B_CALL;
bp->b_iodone = dsiodone;
bp->b_iodone_chain = ic;
if (!(bp->b_flags & B_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.
*/
if (bp->b_vp != NULL)
bp->b_vp->v_numoutput++;
msg = fixlabel((char *)NULL, sp,
(struct disklabel *)
(bp->b_data + ic->ic_args[0].ia_long),
TRUE);
if (msg != NULL) {
printf("%s\n", msg);
bp->b_error = EROFS;
goto bad;
}
}
}
return (1);
bad:
bp->b_flags |= B_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);
switch (mode) {
case S_IFBLK:
sp->ds_bopenmask &= ~mask;
break;
case S_IFCHR:
sp->ds_copenmask &= ~mask;
break;
}
sp->ds_openmask = sp->ds_bopenmask | sp->ds_copenmask;
}
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];
if (sp->ds_bad != NULL) {
free(sp->ds_bad, M_DEVBUF);
set_ds_bad(ssp, slice, (struct dkbad_intern *)NULL);
}
#ifdef DEVFS
if (sp->ds_bdev != NULL)
devfs_remove_dev(sp->ds_bdev);
if (sp->ds_cdev != NULL)
devfs_remove_dev(sp->ds_cdev);
#endif
free_ds_label(ssp, slice);
}
free(ssp, M_DEVBUF);
*sspp = NULL;
}
/*
* For the "write" commands (DIOCSBAD, DIOCSDINFO and DIOCWDINFO), this
* is subject to the same restriction as dsopen().
*/
int
dsioctl(dname, dev, cmd, data, flags, sspp, strat, setgeom)
char *dname;
dev_t dev;
int cmd;
caddr_t data;
int flags;
struct diskslices **sspp;
d_strategy_t *strat;
ds_setgeom_t *setgeom;
{
int error;
struct disklabel *lp;
int old_wlabel;
u_char openmask;
int part;
int slice;
struct diskslice *sp;
struct diskslices *ssp;
slice = dkslice(dev);
ssp = *sspp;
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
switch (cmd) {
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:
*(struct diskslices *)data = *ssp;
return (0);
case DIOCSBAD:
if (slice == WHOLE_DISK_SLICE)
return (ENODEV);
if (!(flags & FWRITE))
return (EBADF);
if (lp == NULL)
return (EINVAL);
if (sp->ds_bad != NULL)
free(sp->ds_bad, M_DEVBUF);
set_ds_bad(ssp, slice, internbad144((struct dkbad *)data, lp));
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 = EINVAL;
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 0 /* XXX */
if (error != 0 && setgeom != NULL)
error = setgeom(lp);
#endif
if (error != 0) {
free(lp, M_DEVBUF);
return (error);
}
free_ds_label(ssp, slice);
set_ds_label(ssp, slice, lp);
#ifdef DEVFS
set_ds_labeldevs(dname, dev, ssp);
#endif
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++) {
u_char openmask1;
openmask1 = ssp->dss_slices[slice].ds_openmask;
if (openmask1
&& (slice != WHOLE_DISK_SLICE
|| openmask1 & ~(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(dname, dev,
ssp->dss_slices[WHOLE_DISK_SLICE].ds_copenmask
& (1 << RAW_PART) ? S_IFCHR : S_IFBLK,
sspp, lp, strat, setgeom, ssp->dss_bdevsw,
ssp->dss_cdevsw);
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_bopenmask,
part = 0; openmask; openmask >>= 1, part++) {
if (!(openmask & 1))
continue;
error = dsopen(dname,
dkmodslice(dkmodpart(dev, part),
slice),
S_IFBLK, sspp, lp, strat,
setgeom, ssp->dss_bdevsw,
ssp->dss_cdevsw);
if (error != 0) {
/* XXX should free devfs toks. */
free(lp, M_DEVBUF);
/* XXX should restore devfs toks. */
*sspp = ssp;
return (EBUSY);
}
}
for (openmask = ssp->dss_slices[slice].ds_copenmask,
part = 0; openmask; openmask >>= 1, part++) {
if (!(openmask & 1))
continue;
error = dsopen(dname,
dkmodslice(dkmodpart(dev, part),
slice),
S_IFCHR, sspp, lp, strat,
setgeom, ssp->dss_bdevsw,
ssp->dss_cdevsw);
if (error != 0) {
/* XXX should free devfs toks. */
free(lp, M_DEVBUF);
/* XXX should restore devfs toks. */
*sspp = ssp;
return (EBUSY);
}
}
}
/* XXX devfs tokens? */
free(lp, M_DEVBUF);
dsgone(&ssp);
return (0);
case DIOCWDINFO:
error = dsioctl(dname, dev, DIOCSDINFO, data, flags, &ssp,
strat, setgeom);
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, strat, sp->ds_label);
/* XXX should invalidate in-core label if write failed. */
set_ds_wlabel(ssp, slice, old_wlabel);
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);
}
}
static void
dsiodone(bp)
struct buf *bp;
{
struct iodone_chain *ic;
char *msg;
ic = bp->b_iodone_chain;
bp->b_flags = (ic->ic_prev_flags & B_CALL)
| (bp->b_flags & ~(B_CALL | B_DONE));
bp->b_iodone = ic->ic_prev_iodone;
bp->b_iodone_chain = ic->ic_prev_iodone_chain;
if (!(bp->b_flags & B_READ)
|| (!(bp->b_flags & B_ERROR) && bp->b_error == 0)) {
msg = fixlabel((char *)NULL, ic->ic_args[1].ia_ptr,
(struct disklabel *)
(bp->b_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);
}
char *
dsname(dname, unit, slice, part, partname)
char *dname;
int unit;
int slice;
int part;
char *partname;
{
static char name[32];
if (strlen(dname) > 16)
dname = "nametoolong";
sprintf(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)
sprintf(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(dname, dev, mode, sspp, lp, strat, setgeom, bdevsw, cdevsw)
char *dname;
dev_t dev;
int mode;
struct diskslices **sspp;
struct disklabel *lp;
d_strategy_t *strat;
ds_setgeom_t *setgeom;
struct bdevsw *bdevsw;
struct cdevsw *cdevsw;
{
struct dkbad *btp;
dev_t dev1;
int error;
struct disklabel *lp1;
char *msg;
u_char mask;
#ifdef DEVFS
int mynor;
#endif
bool_t need_init;
int part;
char partname[2];
int slice;
char *sname;
struct diskslice *sp;
struct diskslices *ssp;
int unit;
/*
* 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) {
TRACE(("dsinit\n"));
error = dsinit(dname, dev, strat, lp, sspp);
if (error != 0) {
dsgone(sspp);
return (error);
}
lp->d_npartitions = MAXPARTITIONS;
lp->d_partitions[RAW_PART].p_size = lp->d_secperunit;
ssp = *sspp;
#ifdef DEVFS
ssp->dss_bdevsw = bdevsw;
ssp->dss_cdevsw = cdevsw;
#endif
/*
* 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;
}
}
lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
*lp1 = *lp;
/*
* Initialize defaults for the label for the whole disk so
* that it can be used as a template for disklabel(8).
* d_rpm = 3600 is unlikely to be correct for a modern
* disk, but d_rpm is normally irrelevant.
*/
if (lp1->d_rpm == 0)
lp1->d_rpm = 3600;
if (lp1->d_interleave == 0)
lp1->d_interleave = 1;
if (lp1->d_bbsize == 0)
lp1->d_bbsize = BBSIZE;
if (lp1->d_sbsize == 0)
lp1->d_sbsize = SBSIZE;
ssp->dss_slices[WHOLE_DISK_SLICE].ds_label = lp1;
ssp->dss_slices[WHOLE_DISK_SLICE].ds_wlabel = TRUE;
if (setgeom != NULL) {
error = setgeom(lp);
if (error != 0) {
dsgone(sspp);
return (error);
}
}
}
unit = dkunit(dev);
/*
* Initialize secondary info for all slices. It is needed for more
* than the current slice in the DEVFS case.
*/
for (slice = 0; slice < ssp->dss_nslices; slice++) {
sp = &ssp->dss_slices[slice];
if (sp->ds_label != NULL)
continue;
dev1 = dkmodslice(dkmodpart(dev, RAW_PART), slice);
sname = dsname(dname, unit, slice, RAW_PART, partname);
#ifdef DEVFS
if (slice != COMPATIBILITY_SLICE && sp->ds_bdev == NULL
&& sp->ds_size != 0) {
mynor = minor(dev1);
sp->ds_bdev =
devfs_add_devswf(bdevsw, mynor, DV_BLK,
UID_ROOT, GID_OPERATOR, 0640,
"%s", sname);
sp->ds_cdev =
devfs_add_devswf(cdevsw, mynor, DV_CHR,
UID_ROOT, GID_OPERATOR, 0640,
"r%s", sname);
}
#endif
/*
* 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 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
*lp1 = *lp;
TRACE(("readdisklabel\n"));
msg = readdisklabel(dev1, strat, lp1);
#if 0 /* XXX */
if (msg == NULL && setgeom != NULL && setgeom(lp1) != 0)
msg = "setgeom failed";
#endif
if (msg == NULL)
msg = fixlabel(sname, sp, lp1, FALSE);
if (msg != NULL) {
free(lp1, M_DEVBUF);
if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
log(LOG_WARNING, "%s: cannot find label (%s)\n",
sname, msg);
continue;
}
if (lp1->d_flags & D_BADSECT) {
btp = malloc(sizeof *btp, M_DEVBUF, M_WAITOK);
TRACE(("readbad144\n"));
msg = readbad144(dev1, strat, lp1, btp);
if (msg != NULL) {
log(LOG_WARNING,
"%s: cannot find bad sector table (%s)\n",
sname, msg);
free(btp, M_DEVBUF);
free(lp1, M_DEVBUF);
continue;
}
set_ds_bad(ssp, slice, internbad144(btp, lp1));
free(btp, M_DEVBUF);
if (sp->ds_bad == NULL) {
free(lp1, M_DEVBUF);
continue;
}
}
set_ds_label(ssp, slice, lp1);
#ifdef DEVFS
set_ds_labeldevs(dname, dev1, ssp);
#endif
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;
switch (mode) {
case S_IFBLK:
sp->ds_bopenmask |= mask;
break;
case S_IFCHR:
sp->ds_copenmask |= mask;
break;
}
sp->ds_openmask = sp->ds_bopenmask | sp->ds_copenmask;
return (0);
}
int
dssize(dev, sspp, dopen, dclose)
dev_t dev;
struct diskslices **sspp;
d_open_t dopen;
d_close_t dclose;
{
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_bopenmask & (1 << part))) {
if (dopen(dev, FREAD, S_IFBLK, (struct proc *)NULL) != 0)
return (-1);
dclose(dev, FREAD, S_IFBLK, (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;
#ifdef DEVFS
free_ds_labeldevs(ssp, slice);
if (slice == COMPATIBILITY_SLICE)
free_ds_labeldevs(ssp, ssp->dss_first_bsd_slice);
else if (slice == ssp->dss_first_bsd_slice)
free_ds_labeldevs(ssp, COMPATIBILITY_SLICE);
#endif
free(lp, M_DEVBUF);
set_ds_label(ssp, slice, (struct disklabel *)NULL);
}
#ifdef DEVFS
static void
free_ds_labeldevs(ssp, slice)
struct diskslices *ssp;
int slice;
{
struct disklabel *lp;
int part;
struct diskslice *sp;
sp = &ssp->dss_slices[slice];
lp = sp->ds_label;
if (lp == NULL)
return;
for (part = 0; part < lp->d_npartitions; part++) {
if (sp->ds_bdevs[part] != NULL) {
devfs_remove_dev(sp->ds_bdevs[part]);
sp->ds_bdevs[part] = NULL;
}
if (sp->ds_cdevs[part] != NULL) {
devfs_remove_dev(sp->ds_cdevs[part]);
sp->ds_cdevs[part] = NULL;
}
}
}
#endif
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,
pp->p_offset, pp->p_offset + pp->p_size - 1, 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);
}
/*
* Most changes to ds_bad, ds_label and ds_wlabel are made using the
* following functions to ensure coherency of the compatibility slice
* with the first BSD slice. The openmask fields are _not_ shared and
* the other fields (ds_offset and ds_size) aren't changed after they
* are initialized.
*/
static void
set_ds_bad(ssp, slice, btp)
struct diskslices *ssp;
int slice;
struct dkbad_intern *btp;
{
ssp->dss_slices[slice].ds_bad = btp;
if (slice == COMPATIBILITY_SLICE)
ssp->dss_slices[ssp->dss_first_bsd_slice].ds_bad = btp;
else if (slice == ssp->dss_first_bsd_slice)
ssp->dss_slices[COMPATIBILITY_SLICE].ds_bad = btp;
}
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;
}
#ifdef DEVFS
static void
set_ds_labeldevs(dname, dev, ssp)
char *dname;
dev_t dev;
struct diskslices *ssp;
{
int slice;
set_ds_labeldevs_unaliased(dname, dev, ssp);
if (ssp->dss_first_bsd_slice == COMPATIBILITY_SLICE)
return;
slice = dkslice(dev);
if (slice == COMPATIBILITY_SLICE)
set_ds_labeldevs_unaliased(dname,
dkmodslice(dev, ssp->dss_first_bsd_slice), ssp);
else if (slice == ssp->dss_first_bsd_slice)
set_ds_labeldevs_unaliased(dname,
dkmodslice(dev, COMPATIBILITY_SLICE), ssp);
}
static void
set_ds_labeldevs_unaliased(dname, dev, ssp)
char *dname;
dev_t dev;
struct diskslices *ssp;
{
struct disklabel *lp;
int mynor;
int part;
char partname[2];
struct partition *pp;
int slice;
char *sname;
struct diskslice *sp;
slice = dkslice(dev);
sp = &ssp->dss_slices[slice];
if (sp->ds_size == 0)
return;
lp = sp->ds_label;
for (part = 0; part < lp->d_npartitions; part++) {
pp = &lp->d_partitions[part];
if (pp->p_size == 0)
continue;
sname = dsname(dname, dkunit(dev), slice, part, partname);
if (part == RAW_PART && sp->ds_bdev != NULL) {
sp->ds_bdevs[part] =
devfs_link(sp->ds_bdev,
"%s%s", sname, partname);
sp->ds_cdevs[part] =
devfs_link(sp->ds_cdev,
"r%s%s", sname, partname);
} else {
mynor = minor(dkmodpart(dev, part));
sp->ds_bdevs[part] =
devfs_add_devswf(ssp->dss_bdevsw, mynor, DV_BLK,
UID_ROOT, GID_OPERATOR, 0640,
"%s%s", sname, partname);
sp->ds_cdevs[part] =
devfs_add_devswf(ssp->dss_cdevsw, mynor, DV_CHR,
UID_ROOT, GID_OPERATOR, 0640,
"r%s%s", sname, partname);
}
}
}
#endif /* DEVFS */
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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