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/*
* Author: Kent Overstreet <kmo@daterainc.com>
*
* GPLv2
*/
#define _FILE_OFFSET_BITS 64
#define __USE_FILE_OFFSET 64
#define _XOPEN_SOURCE 600
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.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: make-bcache [options] device\n"
" -C, --cache Format a cache device\n"
" -B, --bdev Format a backing device\n"
" --wipe-bcache destroy existing bcache data if present\n"
" -l, --label label\n"
" --cset-uuid UUID for the cache set\n"
" --csum-type One of (none|crc32c|crc64)\n"
" -b, --bucket bucket size\n"
" -w, --block block size (hard sector size of SSD, often 2k)\n"
" --replication-set replication set of subsequent devices\n"
" --meta-replicas number of metadata replicas\n"
" --data-replicas number of data replicas\n"
" --tier tier of subsequent devices\n"
" --cache_replacement_policy one of (lru|fifo|random)\n"
" --discard enable discards\n"
" --writeback enable writeback\n"
" -o, --data-offset data offset in sectors\n"
" -h, --help display this help and exit\n");
exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
{
int c, bdev = -1;
size_t i, nr_backing_devices = 0;
unsigned block_size = 0;
unsigned bucket_sizes[argc];
int num_bucket_sizes = 0;
int writeback = 0, discard = 0, wipe_bcache = 0;
unsigned replication_set = 0, tier = 0, replacement_policy = 0;
uint64_t data_offset = BDEV_DATA_START_DEFAULT;
char *label = NULL;
const char *cache_devices[argc];
int cache_dev_fd[argc];
const char *backing_devices[argc];
int backing_dev_fd[argc];
const char *backing_dev_labels[argc];
enum long_opts {
CACHE_SET_UUID = 256,
CSUM_TYPE,
REPLICATION_SET,
META_REPLICAS,
DATA_REPLICAS,
};
const struct option opts[] = {
{ "cache", 0, NULL, 'C' },
{ "bdev", 0, NULL, 'B' },
{ "wipe-bcache", 0, &wipe_bcache, 1 },
{ "label", 1, NULL, 'l' },
{ "cset-uuid", 1, NULL, CACHE_SET_UUID },
{ "csum-type", 1, NULL, CSUM_TYPE },
{ "bucket", 1, NULL, 'b' },
{ "block", 1, NULL, 'w' },
{ "replication-set", 1, NULL, REPLICATION_SET },
{ "meta-replicas", 1, NULL, META_REPLICAS},
{ "data-replicas", 1, NULL, DATA_REPLICAS },
{ "tier", 1, NULL, 't' },
{ "cache_replacement_policy", 1, NULL, 'p' },
{ "discard", 0, &discard, 1 },
{ "writeback", 0, &writeback, 1 },
{ "data_offset", 1, NULL, 'o' },
{ "help", 0, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};
struct cache_sb *cache_set_sb = calloc(1, sizeof(*cache_set_sb) +
sizeof(struct cache_member) * argc);
uuid_generate(cache_set_sb->set_uuid.b);
SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb, BCH_CSUM_CRC32C);
SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb, 1);
SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb, 1);
bucket_sizes[0] = 1024;
while ((c = getopt_long(argc, argv,
"-hCBU:w:b:l:",
opts, NULL)) != -1) {
switch (c) {
case 'C':
bdev = 0;
break;
case 'B':
bdev = 1;
break;
case 'l':
label = optarg;
memcpy(cache_set_sb->label, label,
sizeof(cache_set_sb->label));
break;
case CACHE_SET_UUID:
if (uuid_parse(optarg, cache_set_sb->set_uuid.b)) {
fprintf(stderr, "Bad uuid\n");
exit(EXIT_FAILURE);
}
break;
case CSUM_TYPE:
SET_CACHE_PREFERRED_CSUM_TYPE(cache_set_sb,
read_string_list_or_die(optarg, csum_types,
"csum type"));
break;
case 'b':
bucket_sizes[num_bucket_sizes] = hatoi_validate(optarg, "bucket size");
num_bucket_sizes++;
break;
case 'w':
block_size = hatoi_validate(optarg, "block size");
break;
case REPLICATION_SET:
replication_set = strtoul_or_die(optarg,
CACHE_REPLICATION_SET_MAX,
"replication set");
break;
case META_REPLICAS:
SET_CACHE_SET_META_REPLICAS_WANT(cache_set_sb,
strtoul_or_die(optarg,
CACHE_SET_META_REPLICAS_WANT_MAX,
"meta replicas"));
break;
case DATA_REPLICAS:
SET_CACHE_SET_DATA_REPLICAS_WANT(cache_set_sb,
strtoul_or_die(optarg,
CACHE_SET_DATA_REPLICAS_WANT_MAX,
"data replicas"));
break;
case 't':
tier = strtoul_or_die(optarg, CACHE_TIERS, "tier");
break;
case 'p':
replacement_policy = read_string_list_or_die(optarg,
replacement_policies,
"cache replacement policy");
break;
case 'o':
data_offset = atoll(optarg);
if (data_offset < BDEV_DATA_START_DEFAULT) {
fprintf(stderr, "Bad data offset; minimum %d sectors\n",
BDEV_DATA_START_DEFAULT);
exit(EXIT_FAILURE);
}
break;
case 'h':
usage();
break;
case 1:
if (bdev == -1) {
fprintf(stderr, "Please specify -C or -B\n");
exit(EXIT_FAILURE);
}
if (bdev) {
backing_dev_labels[nr_backing_devices] = label;
backing_devices[nr_backing_devices++] = optarg;
} else {
cache_devices[cache_set_sb->nr_in_set] = optarg;
next_cache_device(cache_set_sb,
replication_set,
tier,
replacement_policy,
discard);
}
break;
}
}
if (!cache_set_sb->nr_in_set && !nr_backing_devices) {
fprintf(stderr, "Please supply a device\n");
usage();
}
i = 0;
do {
if (bucket_sizes[i] < block_size) {
fprintf(stderr, "Bucket size cannot be smaller than block size\n");
exit(EXIT_FAILURE);
}
i++;
} while (i < num_bucket_sizes);
if (!block_size) {
for (i = 0; i < cache_set_sb->nr_in_set; i++)
block_size = max(block_size,
get_blocksize(cache_devices[i]));
for (i = 0; i < nr_backing_devices; i++)
block_size = max(block_size,
get_blocksize(backing_devices[i]));
}
for (i = 0; i < cache_set_sb->nr_in_set; i++)
cache_dev_fd[i] = dev_open(cache_devices[i], wipe_bcache);
for (i = 0; i < nr_backing_devices; i++)
backing_dev_fd[i] = dev_open(backing_devices[i], wipe_bcache);
write_cache_sbs(cache_dev_fd, cache_set_sb, block_size,
bucket_sizes, num_bucket_sizes);
for (i = 0; i < nr_backing_devices; i++)
write_backingdev_sb(backing_dev_fd[i],
block_size, bucket_sizes,
writeback
? CACHE_MODE_WRITEBACK
: CACHE_MODE_WRITETHROUGH,
data_offset,
backing_dev_labels[i],
cache_set_sb->set_uuid);
return 0;
}
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