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