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/*
* Author: Colin King <colin.king@canonical.com>
*
* Copyright (C) 2013 Canonical, Ltd.
*
* 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
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/fs.h>
static int *get_blocks(const char *filename, int *num_blocks)
{
int fd, block_size, i;
int *blocks;
struct stat statinfo;
if ((fd = open(filename, O_RDONLY)) < 0) {
fprintf(stderr, "Cannot open %s\n", filename);
return NULL;
}
if (ioctl(fd, FIGETBSZ, &block_size) < 0) {
fprintf(stderr, "Cannot get block size\n");
close(fd);
return NULL;
}
if (fstat(fd, &statinfo) < 0) {
fprintf(stderr, "Cannot stat %s\n", filename);
close(fd);
return NULL;
}
*num_blocks = (statinfo.st_size + block_size - 1) / block_size;
blocks = malloc(sizeof(int) * *num_blocks);
if (!blocks) {
fprintf(stderr, "Cannot allocate buffer for %d blocks\n", *num_blocks);
close(fd);
return NULL;
}
/*
* Collect blocks, some file systems may not support FIBMAP, so
* silently ignore errors.
*/
for (i = 0; i < *num_blocks; i++) {
blocks[i] = i;
if (ioctl(fd, FIBMAP, &blocks[i]) < 0)
blocks[i] = 0;
}
close(fd);
return blocks;
}
int check_blocks(
int *lower_blocks, int lower_num_blocks,
int *upper_blocks, int upper_num_blocks)
{
int i, j;
/* Upper must not have more blocks than lower */
if (upper_num_blocks > lower_num_blocks)
return EXIT_FAILURE;
/* Upper must have blocks that are in the lower */
for (i = 0; i < upper_num_blocks; i++) {
bool found = false;
for (j = 0; j < lower_num_blocks; j++) {
if (upper_blocks[i] == lower_blocks[j]) {
found = true;
break;
}
}
if (!found)
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
int main(int argc, char **argv) {
int *lower_blocks, *upper_blocks;
int lower_num_blocks, upper_num_blocks;
int rc = EXIT_SUCCESS;
if (argc != 3) {
fprintf(stderr, "Usage: %s lower-file upper-file\n", argv[0]);
exit(EXIT_FAILURE);
}
lower_blocks = get_blocks(argv[1], &lower_num_blocks);
if (!lower_blocks)
exit(EXIT_FAILURE);
upper_blocks = get_blocks(argv[2], &upper_num_blocks);
if (!upper_blocks) {
free(lower_blocks);
exit(EXIT_FAILURE);
}
rc = check_blocks(lower_blocks, lower_num_blocks,
upper_blocks, upper_num_blocks);
free(upper_blocks);
free(lower_blocks);
exit(rc);
}
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