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#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET64
#define _XOPEN_SOURCE 600
#include <ctype.h>
#include <errno.h>
#include <fcntl.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"
char zero[4096];
uint64_t getblocks(int fd)
{
uint64_t ret;
struct stat statbuf;
if (fstat(fd, &statbuf)) {
perror("stat error\n");
exit(EXIT_FAILURE);
}
ret = statbuf.st_size / 512;
if (S_ISBLK(statbuf.st_mode))
if (ioctl(fd, BLKGETSIZE, &ret)) {
perror("ioctl error");
exit(EXIT_FAILURE);
}
return ret;
}
uint64_t hatoi(const char *s)
{
char *e;
long long i = strtoll(s, &e, 10);
switch (*e) {
case 't':
case 'T':
i *= 1024;
case 'g':
case 'G':
i *= 1024;
case 'm':
case 'M':
i *= 1024;
case 'k':
case 'K':
i *= 1024;
}
return i;
}
void usage()
{
printf("Usage: make-bcache [options] device\n"
" -C Format a cache device\n"
" -B Format a backing device\n"
" -b bucket size\n"
" -w block size (hard sector size of SSD, often 2k)\n"
" -U UUID\n"
" -S Set UUID\n");
exit(EXIT_FAILURE);
}
void write_sb(char *dev, struct cache_sb *sb)
{
int fd;
char uuid[40], set_uuid[40];
if (sb->version > 1) {
printf("Must specify one of -C or -B\n");
usage();
}
if ((sb->bucket_size & (sb->bucket_size - 1)) ||
(sb->block_size & (sb->block_size - 1))) {
printf("Block and bucket sizes must be powers of two\n");
exit(EXIT_FAILURE);
}
if (sb->bucket_size < sb->block_size) {
printf("Bad bucket size %i\n", sb->bucket_size);
exit(EXIT_FAILURE);
}
if ((fd = open(dev, O_RDWR)) == -1) {
printf("Can't open dev %s: %s\n", dev, strerror(errno));
exit(EXIT_FAILURE);
}
sb->offset = SB_SECTOR;
memcpy(sb->magic, bcache_magic, 16);
sb->nbuckets = getblocks(fd) / sb->bucket_size;
sb->nr_in_set = 1;
sb->first_bucket = (23 / sb->bucket_size) + 1;
uuid_unparse(sb->uuid, uuid);
uuid_unparse(sb->set_uuid, set_uuid);
if (sb->nbuckets < 1 << 7) {
printf("Not enough buckets: %ju, need %u\n",
sb->nbuckets, 1 << 7);
exit(EXIT_FAILURE);
}
printf("UUID: %s\n"
"Set UUID: %s\n"
"nbuckets: %ju\n"
"block_size: %u\n"
"bucket_size: %u\n"
"nr_in_set: %u\n"
"nr_this_dev: %u\n"
"first_bucket: %u\n",
uuid, set_uuid,
sb->nbuckets,
sb->block_size,
sb->bucket_size,
sb->nr_in_set,
sb->nr_this_dev,
sb->first_bucket);
if (pwrite(fd, sb, sizeof(*sb), SB_SECTOR << 9) != sizeof(*sb)) {
perror("write error\n");
exit(EXIT_FAILURE);
}
fsync(fd);
close(fd);
uuid_generate(sb->uuid);
}
int main(int argc, char **argv)
{
bool written = false;
int c;
struct cache_sb sb;
memset(&sb, 0, sizeof(struct cache_sb));
sb.version = 2;
sb.block_size = 8;
sb.bucket_size = 1024;
uuid_generate(sb.uuid);
uuid_generate(sb.set_uuid);
while ((c = getopt(argc, argv, "-CBU:w:b:")) != -1)
switch (c) {
case 'C':
sb.version = 0;
break;
case 'B':
sb.version = CACHE_BACKING_DEV;
break;
case 'b':
sb.bucket_size = hatoi(optarg) / 512;
break;
case 'w':
sb.block_size = hatoi(optarg) / 512;
break;
case 'U':
if (uuid_parse(optarg, sb.uuid)) {
printf("Bad uuid\n");
exit(EXIT_FAILURE);
}
break;
case 1:
write_sb(optarg, &sb);
written = true;
break;
}
if (!written) {
printf("Please supply a device\n");
exit(EXIT_FAILURE);
}
return 0;
}
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