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util-linux/disk-utils/mkfs.bfs.c

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/*
* mkfs.bfs - Create SCO BFS filesystem - aeb, 1999-09-07
*
* Usage: mkfs.bfs [-N nr-of-inodes] [-V volume-name] [-F fsname] device
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "blkdev.h"
#include "c.h"
#include "closestream.h"
#include "nls.h"
#include "strutils.h"
#include "xalloc.h"
#include "bitops.h"
#define BFS_ROOT_INO 2
#define BFS_NAMELEN 14
#define BFS_BLOCKSIZE 512
#define BFS_SUPER_MAGIC 0x1badface
/* superblock - 512 bytes */
struct bfssb {
uint32_t s_magic;
uint32_t s_start; /* byte offset of start of data */
uint32_t s_end; /* sizeof(slice)-1 */
/* for recovery during compaction */
uint32_t s_from, s_to; /* src and dest block of current transfer */
int32_t s_backup_from, s_backup_to;
/* labels - may well contain garbage */
char s_fsname[6];
char s_volume[6];
char s_pad[472];
};
/* inode - 64 bytes */
struct bfsi {
uint16_t i_ino;
unsigned char i_pad1[2];
uint32_t i_first_block;
uint32_t i_last_block;
uint32_t i_bytes_to_end;
uint32_t i_type; /* 1: file, 2: the unique dir */
uint32_t i_mode;
uint32_t i_uid, i_gid;
uint32_t i_nlinks;
uint32_t i_atime, i_mtime, i_ctime;
unsigned char i_pad2[16];
};
#define BFS_DIR_TYPE 2
/* directory entry - 16 bytes */
struct bfsde {
uint16_t d_ino;
char d_name[BFS_NAMELEN];
};
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fprintf(out,
_("Usage: %s [options] device [block-count]\n"),
program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Make an SCO bfs filesystem.\n"), out);
fprintf(out, _("\nOptions:\n"
" -N, --inodes=NUM specify desired number of inodes\n"
" -V, --vname=NAME specify volume name\n"
" -F, --fname=NAME specify file system name\n"
" -v, --verbose explain what is being done\n"
" -c this option is silently ignored\n"
" -l this option is silently ignored\n"
));
printf(USAGE_HELP_OPTIONS(21));
printf(USAGE_MAN_TAIL("mkfs.bfs(8)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
char *device, *volume, *fsname;
long inodes;
unsigned long long total_blocks, ino_bytes, ino_blocks, data_blocks;
unsigned long long user_specified_total_blocks = 0;
int verbose = 0;
int fd;
uint32_t first_block;
struct bfssb sb;
struct bfsi ri;
struct bfsde de;
struct stat statbuf;
time_t now;
int c, i, len;
enum { VERSION_OPTION = CHAR_MAX + 1 };
static const struct option longopts[] = {
{"inodes", required_argument, NULL, 'N'},
{"vname", required_argument, NULL, 'V'},
{"fname", required_argument, NULL, 'F'},
{"verbose", no_argument, NULL, 'v'},
{"version", no_argument, NULL, VERSION_OPTION},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
if (argc < 2) {
warnx(_("not enough arguments"));
errtryhelp(EXIT_FAILURE);
}
if (argc == 2 && !strcmp(argv[1], "-V"))
print_version(EXIT_SUCCESS);
volume = fsname = " "; /* is there a default? */
inodes = 0;
while ((c = getopt_long(argc, argv, "N:V:F:vhcl", longopts, NULL)) != -1) {
switch (c) {
case 'N':
inodes = strtol_or_err(optarg, _("invalid number of inodes"));
break;
case 'V':
len = strlen(optarg);
if (len <= 0 || len > 6)
errx(EXIT_FAILURE, _("volume name too long"));
volume = xstrdup(optarg);
break;
case 'F':
len = strlen(optarg);
if (len <= 0 || len > 6)
errx(EXIT_FAILURE, _("fsname name too long"));
fsname = xstrdup(optarg);
break;
case 'v':
verbose = 1;
break;
case 'c':
case 'l':
/* when called via mkfs we may get options c,l,v */
break;
case VERSION_OPTION:
print_version(EXIT_SUCCESS);
case 'h':
usage();
default:
errtryhelp(EXIT_FAILURE);
}
}
if (optind == argc) {
warnx(_("no device specified"));
errtryhelp(EXIT_FAILURE);
}
device = argv[optind++];
if (stat(device, &statbuf) < 0)
err(EXIT_FAILURE, _("stat of %s failed"), device);
fd = open_blkdev_or_file(&statbuf, device, O_RDWR);
if (fd < 0)
err(EXIT_FAILURE, _("cannot open %s"), device);
if (optind == argc - 1)
user_specified_total_blocks =
strtou64_or_err(argv[optind], _("invalid block-count"));
else if (optind != argc) {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
if (blkdev_get_sectors(fd, &total_blocks) == -1) {
if (!user_specified_total_blocks)
err(EXIT_FAILURE, _("cannot get size of %s"), device);
total_blocks = user_specified_total_blocks;
} else if (user_specified_total_blocks) {
if (user_specified_total_blocks > total_blocks)
errx(EXIT_FAILURE,
_("blocks argument too large, max is %llu"),
total_blocks);
total_blocks = user_specified_total_blocks;
}
if (!inodes) {
/* pick some reasonable default */
inodes = 8 * (total_blocks / 800);
if (inodes < 48)
inodes = 48;
if (512 < inodes)
inodes = 512;
} else {
/* believe the user */
if (512 < inodes)
errx(EXIT_FAILURE, _("too many inodes - max is 512"));
}
ino_bytes = inodes * sizeof(struct bfsi);
ino_blocks = (ino_bytes + BFS_BLOCKSIZE - 1) / BFS_BLOCKSIZE;
data_blocks = total_blocks - ino_blocks - 1;
/* mimic the behavior of SCO's mkfs - maybe this limit is needed */
if (data_blocks < 32)
errx(EXIT_FAILURE,
_("not enough space, need at least %llu blocks"),
ino_blocks + 33);
memset(&sb, 0, sizeof(sb));
sb.s_magic = cpu_to_le32(BFS_SUPER_MAGIC);
sb.s_start = cpu_to_le32(ino_bytes + sizeof(struct bfssb));
sb.s_end = cpu_to_le32(total_blocks * BFS_BLOCKSIZE - 1);
sb.s_from = sb.s_to = sb.s_backup_from = sb.s_backup_to = -1;
memcpy(sb.s_fsname, fsname, 6);
memcpy(sb.s_volume, volume, 6);
if (verbose) {
fprintf(stderr, _("Device: %s\n"), device);
fprintf(stderr, _("Volume: <%-6s>\n"), volume);
fprintf(stderr, _("FSname: <%-6s>\n"), fsname);
fprintf(stderr, _("BlockSize: %d\n"), BFS_BLOCKSIZE);
if (ino_blocks == 1)
fprintf(stderr, _("Inodes: %ld (in 1 block)\n"),
inodes);
else
fprintf(stderr, _("Inodes: %ld (in %llu blocks)\n"),
inodes, ino_blocks);
fprintf(stderr, _("Blocks: %llu\n"), total_blocks);
fprintf(stderr, _("Inode end: %d, Data end: %d\n"),
le32_to_cpu(sb.s_start) - 1, le32_to_cpu(sb.s_end));
}
if (write(fd, &sb, sizeof(sb)) != sizeof(sb))
err(EXIT_FAILURE, _("error writing superblock"));
memset(&ri, 0, sizeof(ri));
ri.i_ino = cpu_to_le16(BFS_ROOT_INO);
first_block = 1 + ino_blocks;
ri.i_first_block = cpu_to_le32(first_block);
ri.i_last_block = cpu_to_le32(first_block +
(inodes * sizeof(de) - 1) / BFS_BLOCKSIZE);
ri.i_bytes_to_end = cpu_to_le32(first_block * BFS_BLOCKSIZE
+ 2 * sizeof(struct bfsde) - 1);
ri.i_type = cpu_to_le32(BFS_DIR_TYPE);
ri.i_mode = cpu_to_le32(S_IFDIR | 0755); /* or just 0755 */
ri.i_uid = cpu_to_le32(0);
ri.i_gid = cpu_to_le32(1); /* random */
ri.i_nlinks = 2;
time(&now);
ri.i_atime = cpu_to_le32(now);
ri.i_mtime = cpu_to_le32(now);
ri.i_ctime = cpu_to_le32(now);
if (write(fd, &ri, sizeof(ri)) != sizeof(ri))
err(EXIT_FAILURE, _("error writing root inode"));
memset(&ri, 0, sizeof(ri));
for (i = 1; i < inodes; i++)
if (write(fd, &ri, sizeof(ri)) != sizeof(ri))
err(EXIT_FAILURE, _("error writing inode"));
if (lseek(fd, (1 + ino_blocks) * BFS_BLOCKSIZE, SEEK_SET) == -1)
err(EXIT_FAILURE, _("seek error"));
memset(&de, 0, sizeof(de));
de.d_ino = cpu_to_le16(BFS_ROOT_INO);
memcpy(de.d_name, ".", 1);
if (write(fd, &de, sizeof(de)) != sizeof(de))
err(EXIT_FAILURE, _("error writing . entry"));
memcpy(de.d_name, "..", 2);
if (write(fd, &de, sizeof(de)) != sizeof(de))
err(EXIT_FAILURE, _("error writing .. entry"));
if (close_fd(fd) != 0)
err(EXIT_FAILURE, _("error closing %s"), device);
return EXIT_SUCCESS;
}
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