EMILE/libemile/emile_first_set_param_scsi_extents.c
2006-09-20 21:47:43 +00:00

67 lines
1.5 KiB
C

static __attribute__((used)) char* rcsid = "$CVSHeader$";
/*
*
* (c) 2004-2006 Laurent Vivier <Laurent@lvivier.info>
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "libemile.h"
#include "emile.h"
#define BLOCK_SIZE 512 /* FIXME: should ask the disk driver */
int emile_first_set_param_scsi_extents( int fd, int drive_num, int second_offset, int size)
{
int fd;
int ret;
char first[1024];
int current;
unsigned short max_blocks;
int location;
location = lseek(fd, 0, SEEK_CUR);
if (location == -1)
return EEMILE_CANNOT_READ_FIRST;
ret = read(fd, first, 1024);
if (ret == -1)
return EEMILE_CANNOT_READ_FIRST;
max_blocks = read_short((u_int16_t*)&first[1022]) / 6;
write_short((u_int16_t*)&first[1014], BLOCK_SIZE);
write_short((u_int16_t*)&first[1016], drive_num);
write_long((u_int32_t*)&first[1018], 0);
current = 1014;
current -= 2;
write_short((u_int16_t*)&first[current], (size + BLOCK_SIZE - 1) / BLOCK_SIZE);
current -= 4;
write_long((u_int32_t*)&first[current], second_offset);
/* mark end of blocks list */
current -= 2;
write_short((u_int16_t*)(&first[current]), 0);
/* set second level size */
write_long((u_int32_t*)&first[1018], (size + BLOCK_SIZE - 1) / BLOCK_SIZE * BLOCK_SIZE);
ret = lseek(fd, location, SEEK_SET);
if (ret != 0)
return EEMILE_CANNOT_WRITE_FIRST;
ret = write(fd, first, 1024);
if (ret == -1)
return EEMILE_CANNOT_WRITE_FIRST;
return 0;
}