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/*
* Author: Gabriel de Perthuis <g2p.code@gmail.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 500
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include "bcache.h"
void usage()
{
fprintf(stderr, "Usage: bcache-super-show [-f] <device>\n");
}
int main(int argc, char **argv)
{
int o;
extern char *optarg;
struct cache_sb sb_stack, *sb = &sb_stack;
size_t bytes = sizeof(*sb);
bool force_csum = false;
while ((o = getopt(argc, argv, "f")) != EOF)
switch (o) {
case 'f':
force_csum = 1;
break;
default:
usage();
exit(1);
}
argv += optind;
argc -= optind;
if (argc != 1) {
usage();
exit(1);
}
int fd = open(argv[0], O_RDONLY);
if (fd < 0) {
printf("Can't open dev %s: %s\n", argv[0], strerror(errno));
exit(2);
}
if (pread(fd, sb, bytes, SB_START) != bytes) {
fprintf(stderr, "Couldn't read\n");
exit(2);
}
if (sb->keys) {
bytes = sizeof(*sb) + sb->keys * sizeof(uint64_t);
sb = malloc(bytes);
if (pread(fd, sb, bytes, SB_START) != bytes) {
fprintf(stderr, "Couldn't read\n");
exit(2);
}
}
if (!SB_IS_BDEV(sb))
show_super_cache(sb, force_csum);
else
show_super_backingdev(sb, force_csum);
return 0;
}
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