574 lines
15 KiB
C
574 lines
15 KiB
C
/* $NetBSD: disksubr.c,v 1.6 1996/11/23 03:56:44 mark Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1988 Regents of the University of California.
|
|
* Copyright (c) 1995 Mark Brinicombe
|
|
* 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: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/dkbad.h>
|
|
#include <sys/disklabel.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/device.h>
|
|
#include <sys/disk.h>
|
|
|
|
#define b_cylin b_resid
|
|
|
|
/* int filecore_checksum(char *bootblock)
|
|
*
|
|
* Calculates the filecore boot block checksum. This is used to validate
|
|
* a filecore boot block on the disc. If a boot block is validated then
|
|
* it is used to locate the partition table. If the boot block is not
|
|
* validated, it is assumed that the whole disc is RiscBSD.
|
|
*/
|
|
|
|
/*
|
|
* This can be coded better using add with carry but as it is used rarely
|
|
* there is not much point writing it in assembly.
|
|
*/
|
|
|
|
u_int
|
|
filecore_checksum(bootblock)
|
|
u_char *bootblock;
|
|
{
|
|
register u_int sum;
|
|
register u_int loop;
|
|
|
|
/* A boot block of zero has a zero checksum - clever thinking Acorn, NOT ! */
|
|
|
|
sum = 0;
|
|
|
|
for (loop = 0; loop < 512; ++loop)
|
|
sum += bootblock[loop];
|
|
|
|
/* If the whole block is zero then it is invalid */
|
|
|
|
if (sum == 0) return(0xffff);
|
|
|
|
sum = 0;
|
|
|
|
for (loop = 0; loop < 511; ++loop) {
|
|
sum += bootblock[loop];
|
|
if (sum > 255)
|
|
sum -= 255;
|
|
}
|
|
|
|
return(sum);
|
|
}
|
|
|
|
|
|
/*
|
|
* Attempt to read a disk label from a device
|
|
* using the indicated stategy routine.
|
|
* The label must be partly set up before this:
|
|
* secpercyl, secsize and anything required for a block i/o read
|
|
* operation in the driver's strategy/start routines
|
|
* must be filled in before calling us.
|
|
*
|
|
* If dos partition table requested, attempt to load it and
|
|
* find disklabel inside a DOS partition. Also, if bad block
|
|
* table needed, attempt to extract it as well. Return buffer
|
|
* for use in signalling errors if requested.
|
|
*
|
|
* Returns null on success and an error string on failure.
|
|
*/
|
|
|
|
char *
|
|
readdisklabel(dev, strat, lp, osdep)
|
|
dev_t dev;
|
|
void (*strat)();
|
|
struct disklabel *lp;
|
|
struct cpu_disklabel *osdep;
|
|
{
|
|
struct riscbsd_partition *rp = osdep->partitions;
|
|
struct dkbad *bdp = &osdep->bad;
|
|
register struct buf *bp;
|
|
struct disklabel *dlp;
|
|
char *msg = NULL;
|
|
int cyl, riscbsdpartoff, i;
|
|
|
|
/* printf("Reading disclabel for %04x\n", dev);*/
|
|
|
|
/* minimal requirements for archtypal disk label */
|
|
|
|
if (lp->d_secsize == 0)
|
|
lp->d_secsize = DEV_BSIZE;
|
|
|
|
if (lp->d_secperunit == 0)
|
|
lp->d_secperunit = 0x1fffffff;
|
|
|
|
lp->d_npartitions = MAXPARTITIONS;
|
|
for (i = 0; i < MAXPARTITIONS; i++) {
|
|
if (i == RAW_PART) continue;
|
|
lp->d_partitions[i].p_offset = 0;
|
|
lp->d_partitions[i].p_fstype = FS_UNUSED;
|
|
lp->d_partitions[i].p_size = 0;
|
|
}
|
|
|
|
if (lp->d_partitions[RAW_PART].p_size == 0) {
|
|
lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
|
|
lp->d_partitions[RAW_PART].p_offset = 0;
|
|
lp->d_partitions[RAW_PART].p_size = 0x1fffffff;
|
|
}
|
|
|
|
/* obtain buffer to probe drive with */
|
|
|
|
bp = geteblk((int)lp->d_secsize);
|
|
|
|
/* request no partition relocation by driver on I/O operations */
|
|
|
|
bp->b_dev = dev;
|
|
|
|
/* do riscbsd partitions in the process of getting disklabel? */
|
|
|
|
riscbsdpartoff = 0;
|
|
cyl = LABELSECTOR / lp->d_secpercyl;
|
|
|
|
if (rp) {
|
|
struct filecore_bootblock *bb;
|
|
int heads;
|
|
int sectors;
|
|
|
|
/* read the filecore boot block */
|
|
|
|
/* printf("readdisclabel: Reading boot block\n");*/
|
|
|
|
bp->b_blkno = FILECORE_BOOT_SECTOR;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
bp->b_cylin = bp->b_blkno / lp->d_secpercyl;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, validate boot block and locate parition table */
|
|
|
|
if (biowait(bp)) {
|
|
msg = "filecore boot block I/O error";
|
|
goto done;
|
|
}
|
|
|
|
bb = (struct filecore_bootblock *)bp->b_data;
|
|
|
|
/* Validate boot block */
|
|
|
|
if (bb->checksum != filecore_checksum((u_char *)bb)) {
|
|
|
|
/* Invalid boot block so lets assume the entire disc is RiscBSD */
|
|
|
|
/* printf("readdisklabel: Invalid filecore boot block (incorrect checksum)\n");*/
|
|
goto readlabel;
|
|
}
|
|
|
|
/* Get some information from the boot block */
|
|
|
|
cyl = bb->partition_cyl_low + (bb->partition_cyl_high << 8);
|
|
|
|
heads = bb->heads;
|
|
sectors = bb->secspertrack;
|
|
|
|
/* Do we have a RiscBSD partition table ? */
|
|
|
|
if (bb->partition_type == PARTITION_FORMAT_RISCBSD) {
|
|
/* printf("heads = %d nsectors = %d\n", heads, sectors);*/
|
|
|
|
riscbsdpartoff = cyl * heads * sectors;
|
|
} else if (bb->partition_type == PARTITION_FORMAT_RISCIX) {
|
|
struct riscix_partition_table *rpt;
|
|
int loop;
|
|
|
|
/* We have a RISCiX partition table :-( groan */
|
|
|
|
/* Ok read the RISCiX partition table and see if there is a RiscBSD partition */
|
|
|
|
bp->b_blkno = cyl * heads * sectors;
|
|
printf("Found RiscIX partition table @ %08x\n", bp->b_blkno);
|
|
bp->b_cylin = bp->b_blkno / lp->d_secpercyl;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, locate disk label within block and validate */
|
|
|
|
if (biowait(bp)) {
|
|
msg = "disk label I/O error";
|
|
goto done;
|
|
}
|
|
|
|
rpt = (struct riscix_partition_table *)bp->b_data;
|
|
/* for (loop = 0; loop < NRISCIX_PARTITIONS; ++loop)
|
|
printf("p%d: %16s %08x %08x %08x\n", loop,
|
|
rpt->partitions[loop].rp_name,
|
|
rpt->partitions[loop].rp_start,
|
|
rpt->partitions[loop].rp_length,
|
|
rpt->partitions[loop].rp_type);
|
|
*/
|
|
for (loop = 0; loop < NRISCIX_PARTITIONS; ++loop) {
|
|
if (strcmp(rpt->partitions[loop].rp_name, "RiscBSD") == 0
|
|
|| strcmp(rpt->partitions[loop].rp_name, "NetBSD") == 0
|
|
|| strcmp(rpt->partitions[loop].rp_name, "Empty:") == 0) {
|
|
riscbsdpartoff = rpt->partitions[loop].rp_start;
|
|
break;
|
|
}
|
|
}
|
|
if (loop == NRISCIX_PARTITIONS) {
|
|
msg = "RiscBSD partition identifier string not found.";
|
|
goto done;
|
|
}
|
|
} else {
|
|
msg = "Invalid partition format";
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* next, dig out disk label */
|
|
|
|
readlabel:
|
|
/* printf("Reading disklabel addr=%08x\n", riscbsdpartoff * DEV_BSIZE);*/
|
|
|
|
bp->b_blkno = riscbsdpartoff + LABELSECTOR;
|
|
bp->b_cylin = bp->b_blkno / lp->d_secpercyl;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, locate disk label within block and validate */
|
|
|
|
if (biowait(bp)) {
|
|
msg = "disk label I/O error";
|
|
goto done;
|
|
}
|
|
for (dlp = (struct disklabel *)bp->b_data;
|
|
dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - sizeof(*dlp));
|
|
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
|
|
if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
|
|
if (msg == NULL)
|
|
msg = "no disk label";
|
|
} else if (dlp->d_npartitions > MAXPARTITIONS ||
|
|
dkcksum(dlp) != 0)
|
|
msg = "disk label corrupted";
|
|
else {
|
|
*lp = *dlp;
|
|
msg = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (msg)
|
|
goto done;
|
|
|
|
/* obtain bad sector table if requested and present */
|
|
if (bdp && (lp->d_flags & D_BADSECT)) {
|
|
struct dkbad *db;
|
|
|
|
i = 0;
|
|
do {
|
|
/* read a bad sector table */
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
bp->b_blkno = lp->d_secperunit - lp->d_nsectors + i;
|
|
if (lp->d_secsize > DEV_BSIZE)
|
|
bp->b_blkno *= lp->d_secsize / DEV_BSIZE;
|
|
else
|
|
bp->b_blkno /= DEV_BSIZE / lp->d_secsize;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_cylin = lp->d_ncylinders - 1;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, validate, otherwise try another */
|
|
if (biowait(bp)) {
|
|
msg = "bad sector table I/O error";
|
|
} else {
|
|
db = (struct dkbad *)(bp->b_data);
|
|
#define DKBAD_MAGIC 0x4321
|
|
if (db->bt_mbz == 0
|
|
&& db->bt_flag == DKBAD_MAGIC) {
|
|
msg = NULL;
|
|
*bdp = *db;
|
|
break;
|
|
} else
|
|
msg = "bad sector table corrupted";
|
|
}
|
|
} while ((bp->b_flags & B_ERROR) && (i += 2) < 10 &&
|
|
i < lp->d_nsectors);
|
|
}
|
|
|
|
done:
|
|
bp->b_flags = B_INVAL | B_AGE | B_READ;
|
|
brelse(bp);
|
|
return (msg);
|
|
}
|
|
|
|
|
|
/*
|
|
* Check new disk label for sensibility
|
|
* before setting it.
|
|
*/
|
|
|
|
int
|
|
setdisklabel(olp, nlp, openmask, osdep)
|
|
struct disklabel *olp;
|
|
struct disklabel *nlp;
|
|
u_long openmask;
|
|
struct cpu_disklabel *osdep;
|
|
{
|
|
register i;
|
|
register struct partition *opp, *npp;
|
|
|
|
/* sanity clause */
|
|
|
|
if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0
|
|
|| (nlp->d_secsize % DEV_BSIZE) != 0)
|
|
return(EINVAL);
|
|
|
|
/* special case to allow disklabel to be invalidated */
|
|
|
|
if (nlp->d_magic == 0xffffffff) {
|
|
*olp = *nlp;
|
|
return (0);
|
|
}
|
|
|
|
if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC
|
|
|| dkcksum(nlp) != 0)
|
|
return (EINVAL);
|
|
|
|
/* XXX missing check if other dos partitions will be overwritten */
|
|
|
|
while (openmask != 0) {
|
|
i = ffs(openmask) - 1;
|
|
openmask &= ~(1 << i);
|
|
if (nlp->d_npartitions <= i)
|
|
return (EBUSY);
|
|
opp = &olp->d_partitions[i];
|
|
npp = &nlp->d_partitions[i];
|
|
if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
|
|
return (EBUSY);
|
|
/*
|
|
* Copy internally-set partition information
|
|
* if new label doesn't include it. XXX
|
|
*/
|
|
if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
|
|
npp->p_fstype = opp->p_fstype;
|
|
npp->p_fsize = opp->p_fsize;
|
|
npp->p_frag = opp->p_frag;
|
|
npp->p_cpg = opp->p_cpg;
|
|
}
|
|
}
|
|
|
|
nlp->d_checksum = 0;
|
|
nlp->d_checksum = dkcksum(nlp);
|
|
*olp = *nlp;
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write disk label back to device after modification.
|
|
*/
|
|
|
|
int
|
|
writedisklabel(dev, strat, lp, osdep)
|
|
dev_t dev;
|
|
void (*strat)();
|
|
struct disklabel *lp;
|
|
struct cpu_disklabel *osdep;
|
|
{
|
|
struct riscbsd_partition *rp = osdep->partitions;
|
|
register struct buf *bp;
|
|
struct disklabel *dlp;
|
|
int cyl, riscbsdpartoff;
|
|
int error = 0;
|
|
|
|
/* get a buffer and initialize it */
|
|
|
|
bp = geteblk((int)lp->d_secsize);
|
|
bp->b_dev = dev;
|
|
|
|
/* do riscbsd partitions in the process of getting disklabel? */
|
|
|
|
riscbsdpartoff = 0;
|
|
cyl = LABELSECTOR / lp->d_secpercyl;
|
|
|
|
if (rp) {
|
|
struct filecore_bootblock *bb;
|
|
int heads;
|
|
int sectors;
|
|
|
|
/* read the filecore boot block */
|
|
|
|
printf("writedisklabel: Reading boot block\n");
|
|
|
|
bp->b_blkno = FILECORE_BOOT_SECTOR;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
bp->b_cylin = bp->b_blkno / lp->d_secpercyl;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, validate boot block and locate parition table */
|
|
|
|
if (biowait(bp)) {
|
|
printf("writedisklabel: filecore boot block I/O error\n");
|
|
goto done;
|
|
}
|
|
|
|
bb = (struct filecore_bootblock *)bp->b_data;
|
|
|
|
/* Validate boot block */
|
|
|
|
if (bb->checksum != filecore_checksum((u_char *)bb)) {
|
|
/* Invalid boot block so lets assume the entire disc is RiscBSD */
|
|
|
|
printf("writedisklabel: Invalid filecore boot block (incorrect checksum)\n");
|
|
goto writelabel;
|
|
}
|
|
|
|
/* Do we have a RiscBSD partition ? */
|
|
|
|
if (bb->partition_type != PARTITION_FORMAT_RISCBSD) {
|
|
printf("writedisklabel: Invalid partition format\n");
|
|
goto done;
|
|
}
|
|
|
|
cyl = bb->partition_cyl_low + (bb->partition_cyl_high << 8);
|
|
|
|
heads = bb->heads;
|
|
sectors = bb->secspertrack;
|
|
|
|
/*printf("heads = %d nsectors = %d\n", heads, sectors);*/
|
|
|
|
riscbsdpartoff = cyl * heads * sectors;
|
|
}
|
|
|
|
writelabel:
|
|
|
|
/* printf("writedisklabel: Reading disklabel addr=%08x\n", riscbsdpartoff * DEV_BSIZE);*/
|
|
|
|
/* next, dig out disk label */
|
|
|
|
bp->b_blkno = riscbsdpartoff + LABELSECTOR;
|
|
bp->b_cylin = cyl;
|
|
bp->b_bcount = lp->d_secsize;
|
|
bp->b_flags = B_BUSY | B_READ;
|
|
(*strat)(bp);
|
|
|
|
/* if successful, locate disk label within block and validate */
|
|
|
|
if ((error = biowait(bp)))
|
|
goto done;
|
|
for (dlp = (struct disklabel *)bp->b_data;
|
|
dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - sizeof(*dlp));
|
|
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
|
|
if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
|
|
dkcksum(dlp) == 0) {
|
|
*dlp = *lp;
|
|
bp->b_flags = B_BUSY | B_WRITE;
|
|
(*strat)(bp);
|
|
error = biowait(bp);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
error = ESRCH;
|
|
|
|
done:
|
|
bp->b_flags |= B_INVAL;
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
int
|
|
bounds_check_with_label(bp, lp, wlabel)
|
|
struct buf *bp;
|
|
struct disklabel *lp;
|
|
int wlabel;
|
|
{
|
|
struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
|
|
int labelsector = lp->d_partitions[0].p_offset + LABELSECTOR;
|
|
int sz;
|
|
|
|
sz = howmany(bp->b_bcount, lp->d_secsize);
|
|
|
|
if (bp->b_blkno + sz > p->p_size) {
|
|
sz = p->p_size - bp->b_blkno;
|
|
if (sz == 0) {
|
|
/* If exactly at end of disk, return EOF. */
|
|
bp->b_resid = bp->b_bcount;
|
|
goto done;
|
|
}
|
|
if (sz < 0) {
|
|
/* If past end of disk, return EINVAL. */
|
|
bp->b_error = EINVAL;
|
|
goto bad;
|
|
}
|
|
/* Otherwise, truncate request. */
|
|
bp->b_bcount = sz << DEV_BSHIFT;
|
|
}
|
|
|
|
/* Overwriting disk label? */
|
|
if (bp->b_blkno + p->p_offset <= labelsector &&
|
|
#if LABELSECTOR != 0
|
|
bp->b_blkno + p->p_offset + sz > labelsector &&
|
|
#endif
|
|
(bp->b_flags & B_READ) == 0 && !wlabel) {
|
|
bp->b_error = EROFS;
|
|
goto bad;
|
|
}
|
|
|
|
/* calculate cylinder for disksort to order transfers with */
|
|
bp->b_cylin = (bp->b_blkno + p->p_offset) /
|
|
(lp->d_secsize / DEV_BSIZE) / lp->d_secpercyl;
|
|
return (1);
|
|
|
|
bad:
|
|
bp->b_flags |= B_ERROR;
|
|
done:
|
|
return (0);
|
|
}
|
|
|
|
|
|
void
|
|
dk_establish(dk, dev)
|
|
struct disk *dk;
|
|
struct device *dev;
|
|
{
|
|
return;
|
|
}
|
|
|
|
/* End of disksubr.c */
|