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