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freebsd-dev/sys/kern/subr_diskslice.c
Bruce Evans 43be698cb6 Moved initialization of defaults for the label for the whole disk from 
disklabel(8) to the kernel (dsopen()).  Drivers should initialize the
hardware values (rpm, interleave, skews).  Drivers currently don't do
this, but it usually doesn't matter since rotational position stuff is
normally disabled.
1996-06-17 14:43:54 +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 $
* $Id: subr_diskslice.c,v 1.26 1996/06/12 05:07:31 gpalmer Exp $
*/
#include <sys/param.h>
#include <sys/buf.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/ioctl.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 b_cylinder b_resid
#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");
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;
}
/* calculate cylinder for disksort to order transfers with */
bp->b_pblkno = blkno + sp->ds_offset;
if (lp == NULL)
bp->b_cylinder = 0; /* XXX always 0 would be better */
else
bp->b_cylinder = bp->b_pblkno / lp->d_secpercyl;
/*
* 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;
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;
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);
error = setdisklabel(lp, (struct disklabel *)data,
sp->ds_label != NULL
? sp->ds_openmask : (u_long)0);
/* XXX why doesn't setdisklabel() check this? */
if (error == 0 && lp->d_partitions[RAW_PART].p_offset != 0)
error = EINVAL;
#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 openmask;
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(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++) {
u_char openmask;
int part;
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 (-1);
}
}
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;
{
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 = RAW_PART + 1;
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, sp = &ssp->dss_slices[BASE_SLICE];
slice < ssp->dss_nslices; slice++, sp++)
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_npartitions == 0)
lp1->d_npartitions = MAXPARTITIONS;
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);
}
}
}
slice = dkslice(dev);
if (slice >= ssp->dss_nslices)
return (ENXIO);
sp = &ssp->dss_slices[slice];
part = dkpart(dev);
unit = dkunit(dev);
#ifdef DEVFS
if (slice >= BASE_SLICE && sp->ds_bdev == NULL && sp->ds_size != 0) {
mynor = minor(dkmodpart(dev, RAW_PART));
sname = dsname(dname, unit, slice, RAW_PART, partname);
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
if (sp->ds_label == NULL) {
set_ds_wlabel(ssp, slice, TRUE); /* XXX invert */
lp1 = malloc(sizeof *lp1, M_DEVBUF, M_WAITOK);
*lp1 = *lp;
lp = lp1;
TRACE(("readdisklabel\n"));
msg = readdisklabel(dkmodpart(dev, RAW_PART), strat, lp);
#if 0 /* XXX */
if (msg == NULL && setgeom != NULL && setgeom(lp) != 0)
msg = "setgeom failed";
#endif
sname = dsname(dname, unit, slice, RAW_PART, partname);
if (msg == NULL)
msg = fixlabel(sname, sp, lp, FALSE);
if (msg != NULL) {
free(lp, M_DEVBUF);
if (sp->ds_type == DOSPTYP_386BSD /* XXX */)
log(LOG_WARNING, "%s: cannot find label (%s)\n",
sname, msg);
if (part == RAW_PART)
goto out;
return (EINVAL); /* XXX needs translation */
}
if (lp->d_flags & D_BADSECT) {
struct dkbad *btp;
btp = malloc(sizeof *btp, M_DEVBUF, M_WAITOK);
TRACE(("readbad144\n"));
msg = readbad144(dev, strat, lp, btp);
if (msg != NULL) {
log(LOG_WARNING,
"%s: cannot find bad sector table (%s)\n",
sname, msg);
free(btp, M_DEVBUF);
free(lp, M_DEVBUF);
if (part == RAW_PART)
goto out;
return (EINVAL); /* XXX needs translation */
}
set_ds_bad(ssp, slice, internbad144(btp, lp));
free(btp, M_DEVBUF);
if (sp->ds_bad == NULL) {
free(lp, M_DEVBUF);
if (part == RAW_PART)
goto out;
return (EINVAL); /* XXX needs translation */
}
}
set_ds_label(ssp, slice, lp);
#ifdef DEVFS
set_ds_labeldevs(dname, dev, ssp);
#endif
set_ds_wlabel(ssp, slice, FALSE);
}
if (part != RAW_PART
&& (sp->ds_label == NULL || part >= sp->ds_label->d_npartitions))
return (EINVAL); /* XXX needs translation */
out:
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);
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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