disk-utils/mkfs.bfs.c

   1 /*
   2  *  mkfs.bfs - Create SCO BFS filesystem - aeb, 1999-09-07
   3  *
   4  *      Usage: mkfs.bfs [-N nr-of-inodes] [-V volume-name] [-F fsname] device
   5  */
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <getopt.h>
  10 #include <limits.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/stat.h>
  15 #include <time.h>
  16 #include <unistd.h>
  17
  18 #include "blkdev.h"
  19 #include "c.h"
  20 #include "closestream.h"
  21 #include "nls.h"
  22 #include "strutils.h"
  23 #include "xalloc.h"
  24 #include "bitops.h"
  25 #include "exitcodes.h"
  26
  27 #define BFS_ROOT_INO            2
  28 #define BFS_NAMELEN             14
  29 #define BFS_BLOCKSIZE           512
  30 #define BFS_SUPER_MAGIC         0x1badface
  31
  32 /* superblock - 512 bytes */
  33 struct bfssb {
  34         uint32_t s_magic;
  35         uint32_t s_start;       /* byte offset of start of data */
  36         uint32_t s_end; /* sizeof(slice)-1 */
  37
  38         /* for recovery during compaction */
  39         uint32_t s_from, s_to;  /* src and dest block of current transfer */
  40         int32_t s_backup_from, s_backup_to;
  41
  42         /* labels - may well contain garbage */
  43         char s_fsname[6];
  44         char s_volume[6];
  45         char s_pad[472];
  46 };
  47
  48 /* inode - 64 bytes */
  49 struct bfsi {
  50         uint16_t i_ino;
  51         unsigned char i_pad1[2];
  52         uint32_t i_first_block;
  53         uint32_t i_last_block;
  54         uint32_t i_bytes_to_end;
  55         uint32_t i_type;        /* 1: file, 2: the unique dir */
  56         uint32_t i_mode;
  57         uint32_t i_uid, i_gid;
  58         uint32_t i_nlinks;
  59         uint32_t i_atime, i_mtime, i_ctime;
  60         unsigned char i_pad2[16];
  61 };
  62
  63 #define BFS_DIR_TYPE    2
  64
  65 /* directory entry - 16 bytes */
  66 struct bfsde {
  67         uint16_t d_ino;
  68         char d_name[BFS_NAMELEN];
  69 };
  70
  71 static void __attribute__((__noreturn__)) usage(void)
  72 {
  73         FILE *out = stdout;
  74         fprintf(out,
  75                 _("Usage: %s [options] device [block-count]\n"),
  76                 program_invocation_short_name);
  77
  78         fputs(USAGE_SEPARATOR, out);
  79         fputs(_("Make an SCO bfs filesystem.\n"), out);
  80
  81         fprintf(out, _("\nOptions:\n"
  82                        " -N, --inodes=NUM    specify desired number of inodes\n"
  83                        " -V, --vname=NAME    specify volume name\n"
  84                        " -F, --fname=NAME    specify file system name\n"
  85                        " -v, --verbose       explain what is being done\n"
  86                        " -c                  this option is silently ignored\n"
  87                        " -l                  this option is silently ignored\n"
  88                        " --lock[=<mode>]     use exclusive device lock (yes, no or nonblock)\n"
  89                        ));
  90         fprintf(out, USAGE_HELP_OPTIONS(21));
  91
  92         fprintf(out, USAGE_MAN_TAIL("mkfs.bfs(8)"));
  93         exit(EXIT_SUCCESS);
  94 }
  95
  96 int main(int argc, char **argv)
  97 {
  98         char *device, *volume, *fsname;
  99         char *lockmode = 0;
 100         long inodes;
 101         unsigned long long total_blocks, ino_bytes, ino_blocks, data_blocks;
 102         unsigned long long user_specified_total_blocks = 0;
 103         int verbose = 0;
 104         int fd;
 105         uint32_t first_block;
 106         struct bfssb sb;
 107         struct bfsi ri;
 108         struct bfsde de;
 109         struct stat statbuf;
 110         time_t now;
 111         int c, i, len;
 112
 113         enum {
 114             VERSION_OPTION = CHAR_MAX + 1,
 115             OPT_LOCK
 116         };
 117         static const struct option longopts[] = {
 118                 {"inodes", required_argument, NULL, 'N'},
 119                 {"vname", required_argument, NULL, 'V'},
 120                 {"fname", required_argument, NULL, 'F'},
 121                 {"verbose", no_argument, NULL, 'v'},
 122                 {"version", no_argument, NULL, VERSION_OPTION},
 123                 {"help", no_argument, NULL, 'h'},
 124                 {"lock", optional_argument, NULL, OPT_LOCK},
 125                 {NULL, 0, NULL, 0}
 126         };
 127
 128         setlocale(LC_ALL, "");
 129         bindtextdomain(PACKAGE, LOCALEDIR);
 130         textdomain(PACKAGE);
 131         close_stdout_atexit();
 132
 133         if (argc < 2) {
 134                 warnx(_("not enough arguments"));
 135                 errtryhelp(EXIT_FAILURE);
 136         }
 137         if (argc == 2 && !strcmp(argv[1], "-V"))
 138                 print_version(EXIT_SUCCESS);
 139
 140         volume = fsname = "      ";     /* is there a default? */
 141         inodes = 0;
 142
 143         while ((c = getopt_long(argc, argv, "N:V:F:vhcl", longopts, NULL)) != -1) {
 144                 switch (c) {
 145                 case 'N':
 146                         inodes = strtol_or_err(optarg, _("invalid number of inodes"));
 147                         break;
 148
 149                 case 'V':
 150                         len = strlen(optarg);
 151                         if (len <= 0 || len > 6)
 152                                 errx(EXIT_FAILURE, _("volume name too long"));
 153                         volume = xstrdup(optarg);
 154                         break;
 155
 156                 case 'F':
 157                         len = strlen(optarg);
 158                         if (len <= 0 || len > 6)
 159                                 errx(EXIT_FAILURE, _("fsname name too long"));
 160                         fsname = xstrdup(optarg);
 161                         break;
 162
 163                 case 'v':
 164                         verbose = 1;
 165                         break;
 166
 167                 case 'c':
 168                 case 'l':
 169                         /* when called via mkfs we may get options c,l,v */
 170                         break;
 171
 172                 case OPT_LOCK:
 173                         lockmode = "1";
 174                         if (optarg) {
 175                                 if (*optarg == '=')
 176                                         optarg++;
 177                                 lockmode = optarg;
 178                         }
 179                         break;
 180
 181                 case VERSION_OPTION:
 182                         print_version(EXIT_SUCCESS);
 183                 case 'h':
 184                         usage();
 185                 default:
 186                         errtryhelp(EXIT_FAILURE);
 187                 }
 188         }
 189
 190         if (optind == argc) {
 191                 warnx(_("no device specified"));
 192                 errtryhelp(EXIT_FAILURE);
 193         }
 194
 195         device = argv[optind++];
 196
 197         if (stat(device, &statbuf) < 0)
 198                 err(EXIT_FAILURE, _("stat of %s failed"), device);
 199
 200         fd = open_blkdev_or_file(&statbuf, device, O_RDWR);
 201         if (fd < 0)
 202                 err(EXIT_FAILURE, _("cannot open %s"), device);
 203
 204         if (blkdev_lock(fd, device, lockmode) != 0)
 205                 exit(MKFS_EX_ERROR);
 206
 207         if (optind == argc - 1)
 208                 user_specified_total_blocks =
 209                         strtou64_or_err(argv[optind], _("invalid block-count"));
 210         else if (optind != argc) {
 211                 warnx(_("bad usage"));
 212                 errtryhelp(EXIT_FAILURE);
 213         }
 214
 215         if (blkdev_get_sectors(fd, &total_blocks) == -1) {
 216                 if (!user_specified_total_blocks)
 217                         err(EXIT_FAILURE, _("cannot get size of %s"), device);
 218                 total_blocks = user_specified_total_blocks;
 219         } else if (user_specified_total_blocks) {
 220                 if (user_specified_total_blocks > total_blocks)
 221                         errx(EXIT_FAILURE,
 222                              _("blocks argument too large, max is %llu"),
 223                              total_blocks);
 224                 total_blocks = user_specified_total_blocks;
 225         }
 226
 227         if (!inodes) {
 228                 /* pick some reasonable default */
 229                 inodes = 8 * (total_blocks / 800);
 230                 if (inodes < 48)
 231                         inodes = 48;
 232                 if (512 < inodes)
 233                         inodes = 512;
 234         } else {
 235                 /* believe the user */
 236                 if (512 < inodes)
 237                         errx(EXIT_FAILURE, _("too many inodes - max is 512"));
 238         }
 239
 240         ino_bytes = inodes * sizeof(struct bfsi);
 241         ino_blocks = (ino_bytes + BFS_BLOCKSIZE - 1) / BFS_BLOCKSIZE;
 242         data_blocks = total_blocks - ino_blocks - 1;
 243
 244         /* mimic the behavior of SCO's mkfs - maybe this limit is needed */
 245         if (data_blocks < 32)
 246                 errx(EXIT_FAILURE,
 247                      _("not enough space, need at least %llu blocks"),
 248                      ino_blocks + 33);
 249
 250         memset(&sb, 0, sizeof(sb));
 251         sb.s_magic = cpu_to_le32(BFS_SUPER_MAGIC);
 252         sb.s_start = cpu_to_le32(ino_bytes + sizeof(struct bfssb));
 253         sb.s_end = cpu_to_le32(total_blocks * BFS_BLOCKSIZE - 1);
 254         sb.s_from = sb.s_to = sb.s_backup_from = sb.s_backup_to = -1;
 255         memcpy(sb.s_fsname, fsname, 6);
 256         memcpy(sb.s_volume, volume, 6);
 257
 258         if (verbose) {
 259                 fprintf(stderr, _("Device: %s\n"), device);
 260                 fprintf(stderr, _("Volume: <%-6s>\n"), volume);
 261                 fprintf(stderr, _("FSname: <%-6s>\n"), fsname);
 262                 fprintf(stderr, _("BlockSize: %d\n"), BFS_BLOCKSIZE);
 263                 if (ino_blocks == 1)
 264                         fprintf(stderr, _("Inodes: %ld (in 1 block)\n"),
 265                                 inodes);
 266                 else
 267                         fprintf(stderr, _("Inodes: %ld (in %llu blocks)\n"),
 268                                 inodes, ino_blocks);
 269                 fprintf(stderr, _("Blocks: %llu\n"), total_blocks);
 270                 fprintf(stderr, _("Inode end: %d, Data end: %d\n"),
 271                         le32_to_cpu(sb.s_start) - 1, le32_to_cpu(sb.s_end));
 272         }
 273
 274         if (write(fd, &sb, sizeof(sb)) != sizeof(sb))
 275                 err(EXIT_FAILURE, _("error writing superblock"));
 276
 277         memset(&ri, 0, sizeof(ri));
 278         ri.i_ino = cpu_to_le16(BFS_ROOT_INO);
 279         first_block = 1 + ino_blocks;
 280         ri.i_first_block = cpu_to_le32(first_block);
 281         ri.i_last_block = cpu_to_le32(first_block +
 282             (inodes * sizeof(de) - 1) / BFS_BLOCKSIZE);
 283         ri.i_bytes_to_end = cpu_to_le32(first_block * BFS_BLOCKSIZE
 284             + 2 * sizeof(struct bfsde) - 1);
 285         ri.i_type = cpu_to_le32(BFS_DIR_TYPE);
 286         ri.i_mode = cpu_to_le32(S_IFDIR | 0755);        /* or just 0755 */
 287         ri.i_uid = cpu_to_le32(0);
 288         ri.i_gid = cpu_to_le32(1);                      /* random */
 289         ri.i_nlinks = 2;
 290         time(&now);
 291         ri.i_atime = cpu_to_le32(now);
 292         ri.i_mtime = cpu_to_le32(now);
 293         ri.i_ctime = cpu_to_le32(now);
 294
 295         if (write(fd, &ri, sizeof(ri)) != sizeof(ri))
 296                 err(EXIT_FAILURE, _("error writing root inode"));
 297
 298         memset(&ri, 0, sizeof(ri));
 299         for (i = 1; i < inodes; i++)
 300                 if (write(fd, &ri, sizeof(ri)) != sizeof(ri))
 301                         err(EXIT_FAILURE, _("error writing inode"));
 302
 303         if (lseek(fd, (1 + ino_blocks) * BFS_BLOCKSIZE, SEEK_SET) == -1)
 304                 err(EXIT_FAILURE, _("seek error"));
 305
 306         memset(&de, 0, sizeof(de));
 307         de.d_ino = cpu_to_le16(BFS_ROOT_INO);
 308         memcpy(de.d_name, ".", 1);
 309         if (write(fd, &de, sizeof(de)) != sizeof(de))
 310                 err(EXIT_FAILURE, _("error writing . entry"));
 311
 312         memcpy(de.d_name, "..", 2);
 313         if (write(fd, &de, sizeof(de)) != sizeof(de))
 314                 err(EXIT_FAILURE, _("error writing .. entry"));
 315
 316         if (close_fd(fd) != 0)
 317                 err(EXIT_FAILURE, _("error closing %s"), device);
 318
 319         return EXIT_SUCCESS;
 320 }