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/* disk.c: low-level access functions to the disk
*
* Copyright (C) 1995-97 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
* 1996-97 Michael Schlueter <schlue00@marvin.informatik.uni-dortmund.de>
*
* This program is free software. You can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation: either version 2 or
* (at your option) any later version.
*
*/
/* $Id: disk.c,v 1.10 1997/08/22 12:35:38 rnhodek Exp $
*
* $Log: disk.c,v $
* Revision 1.10 1997/08/22 12:35:38 rnhodek
* One more libc6 fix
*
* Revision 1.9 1997/08/11 13:14:59 rnhodek
* Include <asm/unistd.h> to get definition of __NR__llseek if it exists
*
* Revision 1.8 1997/07/08 18:59:00 rnhodek
* Ouch, too many changes without commits in between...
* Implemented moving of partitions
* Implemented checking of "extended start condition" (great changes in
* new_partition())
* Some more tests in verify()
*
* Revision 1.7 1997/06/22 10:36:53 rnhodek
* Added msread, mswrite for moving partitions
*
* Revision 1.6 1997/06/22 10:30:54 rnhodek
* Add __attribute__((unused)) to cvid
*
* Revision 1.5 1997/06/21 20:47:42 rnhodek
* Added RCS keywords
*
* Revision 1.4 1997/06/13 12:57:03 rnhodek
* Little fixes
*
* Revision 1.3 1997/06/13 12:48:22 rnhodek
* Nicer dump_sector
*
* Revision 1.2 1997/06/13 10:18:45 rnhodek
* Implemented settings bootflags on XGM part.
* allow write command if opened read-only and ALPHA_VERSION; actual writing
* skipped in swrite
* nicer output of list_table
*
* Revision 1.1 1997/06/11 14:36:35 rnhodek
* Initial revision
*
* Revision 1.1.1.1 1997/06/11 14:36:35 rnhodek
* Started using CVS for atafdisk
*
*/
#ifndef lint
static char vcid[] __attribute__ ((unused)) =
"$Id: disk.c,v 1.10 1997/08/22 12:35:38 rnhodek Exp $";
#endif /* lint */
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "fdisk.h"
#include "version.h"
#include "disk.h"
#include "input.h"
#include "util.h"
#include "readpart.h"
/*
* sseek: seek to specified sector - return 0 on failure
*
* For >4GB disks lseek needs a > 32bit arg.
* On the other hand, a 32 bit sector number is OK until 2TB.
*
* Thanks to _FILE_OFFSET_BITS, we can have GNU libc use an 64bit off_t even on
* 32bit platforms.
*/
int sseek( unsigned int fd, unsigned long s )
{
off_t in, out;
in = s * SECTOR_SIZE;
out = lseek( fd, in, SEEK_SET );
if (in != out) {
if (out == -1)
perror( "lseek" );
else
fprintf( stderr, "seek error: wanted 0x%08lx, got 0x%08lx\n",
in, out );
return 0;
}
return 1;
}
/* read one sector */
void sread( char *buffer, unsigned long secno )
{
if (!sseek( fd, secno ))
fatal( unable_to_seek );
if (read( fd, buffer, SECTOR_SIZE ) != SECTOR_SIZE) {
perror( "read" );
fatal( unable_to_read );
}
}
/* read multiple sectors (for moving) */
int msread( char *buffer, unsigned long secno, unsigned n )
{
if (!sseek( fd, secno )) {
perror( "seek" );
return( -1 );
}
if (read( fd, buffer, n*SECTOR_SIZE ) != n*SECTOR_SIZE) {
perror( "read" );
return( -1 );
}
return( 0 );
}
#ifdef ALPHA_VERSION
void dump_sector( unsigned long sec, unsigned char *buf )
{
int i, j;
struct rootsector *rs = (struct rootsector *)buf;
printf( "About to write to sector %lu:\n", sec );
for( i = 0; i < SECTOR_SIZE; i += 16 ) {
printf( "%03x: ", i );
for( j = 0; j < 16; ++j )
printf( "%02x ", buf[i+j] );
for( j = 0; j < 16; ++j )
printf( "%c", buf[i+j] >= ' ' ? buf[i+j] : '.' );
printf( "\n" );
}
swab_rs( rs );
for( i = 0; i < 4; ++i ) {
printf( "Slot #%d: flag=%02x ID=%c%c%c start=%9lu size=%9lu\n",
i, rs->part[i].flag,
rs->part[i].id[0], rs->part[i].id[1], rs->part[i].id[2],
rs->part[i].start, rs->part[i].size );
}
printf( "hd_size=%lu bsl_st=%lu bsl_cnt=%lu cksum=%x bootable=%d\n",
rs->hd_size, rs->bsl_st, rs->bsl_cnt, rs->checksum,
check_rootsec_checksum( buf ) );
swab_rs( rs );
printf( "\n" );
}
#endif /* ALPHA_VERSION */
/* write a sector to disk; dump it first and ask if this is a ALPHA version */
void swrite( char *buf, unsigned long secno )
{
if (!dangerous_write( fd, buf, secno ))
fatal( unable_to_write );
}
/* write a sector to arbitrary fd (for restoring savetab file) */
int dangerous_write( int fd, char *buf, unsigned long secno )
{
if (!sseek( fd, secno ))
fatal( unable_to_seek );
#ifdef ALPHA_VERSION
dump_sector( secno, buf );
if (type_open == O_RDONLY ||
!read_yesno( "Do you really want to write that data to disk", -1 ))
/* just fake that operation was ok */
return( 1 );
#endif /* ALPHA_VERSION */
return( write( fd, buf, SECTOR_SIZE ) == SECTOR_SIZE );
}
/* write multiple sectors (for moving) */
int mswrite( char *buf, unsigned long secno, unsigned n )
{
if (!sseek( fd, secno )) {
perror( "seek" );
return( -1 );
}
#ifdef ALPHA_VERSION
if (type_open == O_RDONLY) {
printf( "ALPHA and ro, not actually writing %u sectors to %lu\n",
n, secno );
return( 0 );
}
#endif
if (write( fd, buf, n*SECTOR_SIZE ) != n*SECTOR_SIZE) {
perror( "write" );
return( -1 );
}
return( 0 );
}
/* Local Variables: */
/* tab-width: 8 */
/* End: */
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