EMILE/libemile/emile_second_create_mapfile.c

138 lines
2.7 KiB
C

/*
*
* (c) 2005 Laurent Vivier <Laurent@lvivier.info>
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <string.h>
#include "libemile.h"
struct emile_container *emile_second_create_mapfile(unsigned short *unit_id, char *mapfile, char* kernel)
{
struct emile_container *container;
int fd;
int ret;
unsigned short unit_id_map;
int block_size;
/* create container of the kernel */
fd = open(kernel, O_RDONLY);
if (fd == -1)
{
fprintf(stderr, "ERROR: cannot open kernel\n");
return NULL;
}
/* get filesystem block size */
ret = ioctl(fd, FIGETBSZ, &block_size);
if (ret != 0) {
close(fd);
perror("ioctl(FIGETBSZ)");
return NULL;
}
container = (struct emile_container *)malloc(block_size);
if (container == NULL)
{
fprintf(stderr, "ERROR: cannot allocate memory for container\n");
close(fd);
return NULL;
}
memset(container, 0, block_size);
ret = emile_scsi_create_container(fd, &unit_id_map, container,
(block_size - sizeof(struct emile_container)) / sizeof(struct emile_block));
close(fd);
if (ret != 0)
{
fprintf(stderr, "ERROR: cannot fill container\n");
free(container);
return NULL;
}
/* write container to map file */
fd = open(mapfile, O_CREAT | O_WRONLY);
if (fd == -1)
{
fprintf(stderr, "ERROR: cannot create map file (%s)\n", mapfile);
free(container);
return NULL;
}
ret = write(fd, container, block_size);
close(fd);
if (ret != block_size)
{
fprintf(stderr, "ERROR: cannot write map file (%s)\n", mapfile);
free(container);
return NULL;
}
/* now, we must know where is the map file */
memset(container, 0, block_size);
fd = open(mapfile, O_RDONLY);
if (fd == -1)
{
fprintf(stderr, "ERROR: cannot open map file to read (%s)\n", mapfile);
free(container);
return NULL;
}
ret = emile_scsi_create_container(fd, unit_id, container,
(block_size - sizeof(struct emile_container)) / sizeof(struct emile_block));
close(fd);
if (ret != 0)
{
fprintf(stderr, "ERROR: cannot map map file...\n");
free(container);
return NULL;
}
if (unit_id_map != *unit_id)
{
fprintf(stderr, "ERROR: map file must be on the same disk as the file to map\n");
free(container);
return NULL;
}
if (container->size != block_size)
{
fprintf(stderr, "ERROR: map file size is bad (%d)\n", container->size);
free(container);
return NULL;
}
if (container->blocks[0].count == 0)
{
fprintf(stderr, "ERROR: map file is empty !\n");
free(container);
return NULL;
}
if (container->blocks[1].count != 0)
{
fprintf(stderr, "ERROR: map file is not contiguous\n");
free(container);
return NULL;
}
return container;
}