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/*
* Authors: Kent Overstreet <kent.overstreet@gmail.com>
* Gabriel de Perthuis <g2p.code@gmail.com>
* Jacob Malevich <jam@datera.io>
*
* GPLv2
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <blkid.h>
#include <uuid/uuid.h>
#include "ccan/darray/darray.h"
#include "bcache-cmds.h"
#include "libbcache.h"
/* Open a block device, do magic blkid stuff: */
static int open_for_format(const char *dev, bool force)
{
blkid_probe pr;
const char *fs_type = NULL, *fs_label = NULL;
size_t fs_type_len, fs_label_len;
int fd;
if ((fd = open(dev, O_RDWR|O_EXCL)) == -1)
die("Can't open dev %s: %s\n", dev, strerror(errno));
if (force)
return fd;
if (!(pr = blkid_new_probe()))
die("blkid error 1");
if (blkid_probe_set_device(pr, fd, 0, 0))
die("blkid error 2");
if (blkid_probe_enable_partitions(pr, true))
die("blkid error 3");
if (blkid_do_fullprobe(pr) < 0)
die("blkid error 4");
blkid_probe_lookup_value(pr, "TYPE", &fs_type, &fs_type_len);
blkid_probe_lookup_value(pr, "LABEL", &fs_label, &fs_label_len);
if (fs_type) {
if (fs_label)
printf("%s contains a %s filesystem labelled '%s'\n",
dev, fs_type, fs_label);
else
printf("%s contains a %s filesystem\n",
dev, fs_type);
if (!ask_proceed())
exit(EXIT_FAILURE);
}
blkid_free_probe(pr);
return fd;
}
static void usage(void)
{
puts("bcache format - create a new bcache filesystem on one or more devices\n"
"Usage: bcache format [OPTION]... <devices>\n"
"\n"
"Options:\n"
" -b, --block=size\n"
" --btree_node=size Btree node size, default 256k\n"
" --metadata_checksum_type=(none|crc32c|crc64)\n"
" --data_checksum_type=(none|crc32c|crc64)\n"
" --compression_type=(none|lz4|gzip)\n"
" --error_action=(continue|readonly|panic)\n"
" Action to take on filesystem error\n"
" --max_journal_entry_size=size\n"
" -l, --label=label\n"
" --uuid=uuid\n"
" -f, --force\n"
"\n"
"Device specific options:\n"
" --fs_size=size Size of filesystem on device\n"
" --bucket=size bucket size\n"
" --discard Enable discards\n"
" -t, --tier=# tier of subsequent devices\n"
"\n"
" -h, --help display this help and exit\n"
"\n"
"Device specific options must come before corresponding devices, e.g.\n"
" bcache format --tier 0 /dev/sdb --tier 1 /dev/sdc\n"
"\n"
"Report bugs to <linux-bcache@vger.kernel.org>");
exit(EXIT_SUCCESS);
}
#define OPTS \
OPT('b', block_size, required_argument) \
OPT(0, btree_node_size, required_argument) \
OPT(0, metadata_checksum_type, required_argument) \
OPT(0, data_checksum_type, required_argument) \
OPT(0, compression_type, required_argument) \
OPT('e', error_action, required_argument) \
OPT(0, max_journal_entry_size, required_argument) \
OPT('L', label, required_argument) \
OPT('U', uuid, required_argument) \
OPT('f', force, no_argument) \
OPT(0, fs_size, required_argument) \
OPT(0, bucket_size, required_argument) \
OPT('t', tier, required_argument) \
OPT(0, discard, no_argument) \
OPT('h', help, no_argument)
enum {
Opt_no_opt = 1,
#define OPT(shortopt, longopt, has_arg) Opt_##longopt,
OPTS
#undef OPT
};
static const struct option format_opts[] = {
#define OPT(shortopt, longopt, has_arg) { \
#longopt, has_arg, NULL, Opt_##longopt \
},
OPTS
#undef OPT
{ NULL }
};
int cmd_format(int argc, char *argv[])
{
darray(struct dev_opts) devices;
struct dev_opts *dev;
unsigned block_size = 0;
unsigned btree_node_size = 0;
unsigned meta_csum_type = BCH_CSUM_CRC32C;
unsigned data_csum_type = BCH_CSUM_CRC32C;
unsigned compression_type = BCH_COMPRESSION_NONE;
unsigned on_error_action = BCH_ON_ERROR_RO;
char *label = NULL;
uuid_le uuid;
bool force = false;
/* Device specific options: */
u64 filesystem_size = 0;
unsigned bucket_size = 0;
unsigned tier = 0;
bool discard = false;
unsigned max_journal_entry_size = 0;
char *passphrase = NULL;
int opt;
darray_init(devices);
uuid_clear(uuid.b);
while ((opt = getopt_long(argc, argv,
"-b:e:L:U:ft:h",
format_opts,
NULL)) != -1)
switch (opt) {
case Opt_block_size:
case 'b':
block_size = hatoi_validate(optarg,
"block size");
break;
case Opt_btree_node_size:
btree_node_size = hatoi_validate(optarg,
"btree node size");
break;
case Opt_metadata_checksum_type:
meta_csum_type = read_string_list_or_die(optarg,
csum_types, "checksum type");
break;
case Opt_data_checksum_type:
data_csum_type = read_string_list_or_die(optarg,
csum_types, "checksum type");
break;
case Opt_compression_type:
compression_type = read_string_list_or_die(optarg,
compression_types, "compression type");
break;
case Opt_error_action:
case 'e':
on_error_action = read_string_list_or_die(optarg,
error_actions, "error action");
break;
case Opt_max_journal_entry_size:
max_journal_entry_size = hatoi_validate(optarg,
"journal entry size");
break;
case Opt_label:
case 'L':
label = strdup(optarg);
break;
case Opt_uuid:
case 'U':
if (uuid_parse(optarg, uuid.b))
die("Bad uuid");
break;
case Opt_force:
case 'f':
force = true;
break;
case Opt_fs_size:
filesystem_size = hatoi(optarg) >> 9;
break;
case Opt_bucket_size:
bucket_size = hatoi_validate(optarg, "bucket size");
break;
case Opt_tier:
case 't':
tier = strtoul_or_die(optarg, CACHE_TIERS, "tier");
break;
case Opt_discard:
discard = true;
break;
case Opt_no_opt:
darray_append(devices, (struct dev_opts) {
.path = strdup(optarg),
.size = filesystem_size,
.bucket_size = bucket_size,
.tier = tier,
.discard = discard,
});
break;
case Opt_help:
case 'h':
usage();
break;
}
if (!darray_size(devices))
die("Please supply a device");
if (uuid_is_null(uuid.b))
uuid_generate(uuid.b);
darray_foreach(dev, devices)
dev->fd = open_for_format(dev->path, force);
bcache_format(devices.item, darray_size(devices),
block_size,
btree_node_size,
meta_csum_type,
data_csum_type,
compression_type,
1,
1,
on_error_action,
max_journal_entry_size,
label,
uuid);
if (passphrase) {
memzero_explicit(passphrase, strlen(passphrase));
free(passphrase);
}
return 0;
}
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