NetBSD/lib/libahdi/read.c

273 lines
6.8 KiB
C

/* $NetBSD: read.c,v 1.1 2000/02/05 20:40:47 jdc Exp $ */
/*
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Julian Coleman, Waldi Ravens and Leo Weppelman.
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include "privahdi.h"
#include <fcntl.h>
#include <stdlib.h>
#include <sys/dkio.h>
/*
* Read AHDI partitions from disk.
*/
int
ahdi_readlabel (ptable, diskname, flags)
struct ahdi_ptable *ptable;
char *diskname;
int flags;
{
int fd, rv;
struct disklabel *dl;
if (!(fd = openraw (diskname, O_RDONLY)))
return (-1);
if ((dl = read_dl (fd)) == NULL) {
close (fd);
return (-1);
}
if (dl->d_secsize != AHDI_BSIZE) {
close (fd);
return (-2);
}
if ((rv = check_magic(fd, LABELSECTOR, flags)) < 0) {
close (fd);
return (rv);
}
bzero ((void *) ptable, sizeof (struct ahdi_ptable));
if ((rv = read_rsec (fd, ptable, AHDI_BBLOCK, AHDI_BBLOCK, flags))
< 0) {
close (fd);
return (rv);
}
if (dl->d_secperunit != ptable->secperunit) {
if (flags & AHDI_IGN_SPU)
ptable->secperunit = dl->d_secperunit;
else {
close (fd);
return (-6);
}
}
ptable->nsectors = dl->d_nsectors;
ptable->ntracks = dl->d_ntracks;
ptable->ncylinders = dl->d_ncylinders;
ptable->secpercyl = dl->d_secpercyl;
assign_letters (ptable);
close (fd);
return (1);
}
/*
* Read AHDI partitions from root sector/auxillary root sector.
*/
int
read_rsec (fd, ptable, rsec, esec, flags)
int fd;
struct ahdi_ptable *ptable;
u_int rsec, esec;
int flags;
{
struct ahdi_part *part, *end;
struct ahdi_root *root;
u_int16_t cksum, newcksum;
int rv;
if ((root = disk_read (fd, rsec, 1)) == NULL) {
return (-1);
}
if (rsec == AHDI_BBLOCK) {
end = &root->ar_parts[AHDI_MAXRPD];
if (root->ar_checksum) {
cksum = root->ar_checksum;
root->ar_checksum = 0;
newcksum = ahdi_cksum (root);
if ((cksum != newcksum) && !(flags & AHDI_IGN_CKSUM)) {
free (root);
return (-4);
}
}
ptable->secperunit=root->ar_hdsize;
} else
end = &root->ar_parts[AHDI_MAXARPD];
for (part = root->ar_parts; part < end; ++part) {
#ifdef DEBUG
printf ("Found partitions at sector %u:\n", rsec);
printf (" flags : %02x\n", part->ap_flg);
printf (" id : %c%c%c\n", part->ap_id[0], part->ap_id[1],
part->ap_id[2]);
printf (" start : %u\n", part->ap_st);
printf (" size : %u\n", part->ap_size);
#endif
if (!(part->ap_flg & 0x01))
if ((part->ap_id[0] || part->ap_id[1] ||
part->ap_id[2]) && (flags & AHDI_IGN_EXISTS))
part->ap_flg &= 0x01;
else
continue;
if (AHDI_MKPID (part->ap_id[0], part->ap_id[1],
part->ap_id[2]) == AHDI_PID_XGM) {
u_int offs = part->ap_st + esec;
if ((rv = read_rsec (fd, ptable, offs,
esec == AHDI_BBLOCK ? offs : esec, flags)) < 0) {
free (root);
return (rv);
}
} else {
/* Attempt to check for junk values */
if (((part->ap_st + rsec) > ptable->secperunit ||
(part->ap_st + rsec + part->ap_size -1) >
ptable->secperunit)) {
if (flags & AHDI_IGN_EXT) {
/* Fake previous partition */
ptable->parts[ptable->nparts].id[0] =
part->ap_id[0];
ptable->parts[ptable->nparts].id[1] =
part->ap_id[1];
ptable->parts[ptable->nparts].id[2] =
part->ap_id[2];
} else {
free (root);
return (-5);
}
}
ptable->parts[ptable->nparts].flag = part->ap_flg;
ptable->parts[ptable->nparts].id[0] = part->ap_id[0];
ptable->parts[ptable->nparts].id[1] = part->ap_id[1];
ptable->parts[ptable->nparts].id[2] = part->ap_id[2];
ptable->parts[ptable->nparts].root = rsec;
ptable->parts[ptable->nparts].start =
part->ap_st + rsec;
ptable->parts[ptable->nparts].size = part->ap_size;
ptable->nparts++;
}
}
free (root);
return (1);
}
/*
* Read a sector from the disk.
*/
void *
disk_read (fd, start, count)
int fd;
u_int start,
count;
{
void *buffer;
off_t offset;
size_t size;
size = count * DEV_BSIZE;
offset = start * DEV_BSIZE;
if ((buffer = malloc (size)) == NULL)
return (NULL);
if (lseek (fd, offset, SEEK_SET) != offset) {
free (buffer);
return (NULL);
}
if (read (fd, buffer, size) != size) {
free (buffer);
return (NULL);
}
return (buffer);
}
/*
* Assign NetBSD drive letters to partitions
*/
void
assign_letters (ptable)
struct ahdi_ptable *ptable;
{
int i, have_root, pno;
u_int32_t pid;
#define ROOT_PART 0
have_root = 0;
pno = 0;
for (i = 0; i < ptable->nparts; i++) {
while (pno == ROOT_PART || pno == SWAP_PART || pno == RAW_PART)
pno++;
pid = AHDI_MKPID (ptable->parts[i].id[0],
ptable->parts[i].id[1], ptable->parts[i].id[2]);
if (!have_root && pid == AHDI_PID_NBD) {
ptable->parts[i].letter = ROOT_PART;
have_root = 1;
} else if (pid == AHDI_PID_SWP)
ptable->parts[i].letter = SWAP_PART;
else {
ptable->parts[i].letter = pno;
pno++;
}
}
}
/*
* Read disklabel for disk.
*/
struct disklabel *
read_dl (fd)
int fd;
{
struct disklabel *dl;
if ((dl = malloc (sizeof (struct disklabel))) == NULL) {
return (NULL);
}
if (ioctl (fd, DIOCGDINFO, dl) < 0) {
return (NULL);
}
return (dl);
}