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