usr.sbin/vnconfig/vnconfig.c

   1 /*
   2  * Copyright (c) 1993 University of Utah.
   3  * Copyright (c) 1990, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * the Systems Programming Group of the University of Utah Computer
   8  * Science Department.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * from: Utah $Hdr: vnconfig.c 1.1 93/12/15$
  35  *
  36  * @(#)vnconfig.c       8.1 (Berkeley) 12/15/93
  37  * $FreeBSD: src/usr.sbin/vnconfig/vnconfig.c,v 1.13.2.7 2003/06/02 09:10:27 maxim Exp $
  38  * $DragonFly: src/usr.sbin/vnconfig/vnconfig.c,v 1.15 2008/07/27 22:36:01 thomas Exp $
  39  */
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <paths.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <fcntl.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <sys/param.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/linker.h>
  53 #include <sys/mount.h>
  54 #include <sys/module.h>
  55 #include <sys/stat.h>
  56 #include <sys/vnioctl.h>
  57 #include <vfs/ufs/ufsmount.h>
  58
  59 #define LINESIZE        1024
  60 #define ZBUFSIZE        32768
  61
  62 struct vndisk {
  63         char    *dev;
  64         char    *file;
  65         char    *autolabel;
  66         int     flags;
  67         int64_t size;
  68         char    *oarg;
  69 } *vndisks;
  70
  71 #define VN_CONFIG       0x01
  72 #define VN_UNCONFIG     0x02
  73 #define VN_ENABLE       0x04
  74 #define VN_DISABLE      0x08
  75 #define VN_SWAP         0x10
  76 #define VN_MOUNTRO      0x20
  77 #define VN_MOUNTRW      0x40
  78 #define VN_IGNORE       0x80
  79 #define VN_SET          0x100
  80 #define VN_RESET        0x200
  81 #define VN_TRUNCATE     0x400
  82 #define VN_ZERO         0x800
  83
  84 int nvndisks;
  85
  86 int all = 0;
  87 int verbose = 0;
  88 int global = 0;
  89 int listopt = 0;
  90 u_long setopt = 0;
  91 u_long resetopt = 0;
  92 const char *configfile;
  93
  94 int config(struct vndisk *);
  95 void getoptions(struct vndisk *, const char *);
  96 int getinfo(const char *vname);
  97 char *rawdevice(const char *);
  98 void readconfig(int);
  99 static void usage(void);
 100 static int64_t getsize(const char *arg);
 101 static void do_autolabel(const char *dev, const char *label);
 102 int what_opt(const char *, u_long *);
 103
 104 int
 105 main(int argc, char *argv[])
 106 {
 107         int i, rv;
 108         int flags = 0;
 109         int64_t size = 0;
 110         char *autolabel = NULL;
 111         char *s;
 112
 113         configfile = _PATH_VNTAB;
 114         while ((i = getopt(argc, argv, "acdef:glr:s:S:TZL:uv")) != -1)
 115                 switch (i) {
 116
 117                 /* all -- use config file */
 118                 case 'a':
 119                         all++;
 120                         break;
 121
 122                 /* configure */
 123                 case 'c':
 124                         flags |= VN_CONFIG;
 125                         flags &= ~VN_UNCONFIG;
 126                         break;
 127
 128                 /* disable */
 129                 case 'd':
 130                         flags |= VN_DISABLE;
 131                         flags &= ~VN_ENABLE;
 132                         break;
 133
 134                 /* enable */
 135                 case 'e':
 136                         flags |= (VN_ENABLE|VN_CONFIG);
 137                         flags &= ~(VN_DISABLE|VN_UNCONFIG);
 138                         break;
 139
 140                 /* alternate config file */
 141                 case 'f':
 142                         configfile = optarg;
 143                         break;
 144
 145                 /* fiddle global options */
 146                 case 'g':
 147                         global = 1 - global;
 148                         break;
 149
 150                 /* reset options */
 151                 case 'r':
 152                         for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
 153                                 if (what_opt(s, &resetopt))
 154                                         errx(1, "invalid options '%s'", s);
 155                         }
 156                         flags |= VN_RESET;
 157                         break;
 158
 159                 case 'l':
 160                         listopt = 1;
 161                         break;
 162
 163                 /* set options */
 164                 case 's':
 165                         for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
 166                                 if (what_opt(s, &setopt))
 167                                         errx(1, "invalid options '%s'", s);
 168                         }
 169                         flags |= VN_SET;
 170                         break;
 171
 172                 /* unconfigure */
 173                 case 'u':
 174                         flags |= (VN_DISABLE|VN_UNCONFIG);
 175                         flags &= ~(VN_ENABLE|VN_CONFIG);
 176                         break;
 177
 178                 /* verbose */
 179                 case 'v':
 180                         verbose++;
 181                         break;
 182
 183                 case 'S':
 184                         size = getsize(optarg);
 185                         flags |= VN_CONFIG;
 186                         flags &= ~VN_UNCONFIG;
 187                         break;
 188
 189                 case 'T':
 190                         flags |= VN_TRUNCATE;
 191                         break;
 192
 193                 case 'Z':
 194                         flags |= VN_ZERO;
 195                         break;
 196
 197                 case 'L':
 198                         autolabel = optarg;
 199                         break;
 200
 201                 default:
 202                         usage();
 203                 }
 204
 205         if (modfind("vn") < 0)
 206                 if (kldload("vn") < 0 || modfind("vn") < 0)
 207                         warnx( "cannot find or load \"vn\" kernel module");
 208
 209         rv = 0;
 210         if (listopt) {
 211                 if(argc > optind)
 212                         while(argc > optind)
 213                                 rv += getinfo( argv[optind++]);
 214                 else {
 215                         rv = getinfo( NULL );
 216                 }
 217                 exit(rv);
 218         }
 219
 220         if (flags == 0)
 221                 flags = VN_CONFIG;
 222         if (all) {
 223                 readconfig(flags);
 224         } else {
 225                 vndisks = calloc(sizeof(struct vndisk), 1);
 226                 if (argc < optind + 1)
 227                         usage();
 228                 vndisks[0].dev = argv[optind++];
 229                 vndisks[0].file = argv[optind++];       /* may be NULL */
 230                 vndisks[0].flags = flags;
 231                 vndisks[0].size = size;
 232                 vndisks[0].autolabel = autolabel;
 233                 if (optind < argc)
 234                         getoptions(&vndisks[0], argv[optind]);
 235                 nvndisks = 1;
 236         }
 237         rv = 0;
 238         for (i = 0; i < nvndisks; i++)
 239                 rv += config(&vndisks[i]);
 240         exit(rv);
 241 }
 242
 243 int
 244 what_opt(const char *str, u_long *p)
 245 {
 246         if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
 247         if (!strcmp(str,"labels")) { return 0; }        /* deprecated */
 248         if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }
 249         if (!strcmp(str,"debug")) { *p |= VN_DEBUG; return 0; }
 250         if (!strcmp(str,"io")) { *p |= VN_IO; return 0; }
 251         if (!strcmp(str,"all")) { *p |= ~0; return 0; }
 252         if (!strcmp(str,"none")) { *p |= 0; return 0; }
 253         return 1;
 254 }
 255
 256 /*
 257  *
 258  * GETINFO
 259  *
 260  *      Print vnode disk information to stdout for the device at
 261  *      path 'vname', or all existing 'vn' devices if none is given.
 262  *      Any 'vn' devices must exist under /dev in order to be queried.
 263  *
 264  *      Todo: correctly use vm_secsize for swap-backed vn's ..
 265  */
 266
 267 int
 268 getinfo( const char *vname )
 269 {
 270         int i = 0, vd, printlim = 0;
 271         char vnpath[PATH_MAX];
 272         const char *tmp;
 273
 274         struct vn_user vnu;
 275         struct stat sb;
 276
 277         if (vname == NULL) {
 278                 printlim = 1024;
 279         } else {
 280                 tmp = vname;
 281                 while (*tmp != 0) {
 282                         if(isdigit(*tmp)){
 283                                 i = atoi(tmp);
 284                                 printlim = i + 1;
 285                                 break;
 286                         }
 287                         tmp++;
 288                 }
 289                 if (*tmp == '\0')
 290                         errx(1, "unknown vn device: %s", vname);
 291         }
 292
 293         snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", i);
 294
 295         vd = open(vnpath, O_RDONLY);
 296         if (vd < 0)
 297                 err(1, "open: %s", vnpath);
 298
 299         for (; i<printlim; i++) {
 300
 301                 bzero(&vnpath, sizeof(vnpath));
 302                 bzero(&sb, sizeof(struct stat));
 303                 bzero(&vnu, sizeof(struct vn_user));
 304
 305                 vnu.vnu_unit = i;
 306
 307                 snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", vnu.vnu_unit);
 308
 309                 if(stat(vnpath, &sb) < 0) {
 310                         break;
 311                 }
 312                 else {
 313                         if (ioctl(vd, VNIOCGET, &vnu) == -1) {
 314                                 warn("vn%d: ioctl", i);
 315                                         continue;
 316                         }
 317
 318                         fprintf(stdout, "vn%d: ", vnu.vnu_unit);
 319
 320                         if (vnu.vnu_file[0] == 0)
 321                                 fprintf(stdout, "not in use\n");
 322                         else if ((strcmp(vnu.vnu_file, _VN_USER_SWAP)) == 0)
 323                                 fprintf(stdout,
 324                                         "consuming %jd VM pages\n",
 325                                         (intmax_t)vnu.vnu_size);
 326                         else
 327                                 fprintf(stdout,
 328                                         "covering %s on %s, inode %ju\n",
 329                                         vnu.vnu_file,
 330                                         devname(vnu.vnu_dev, S_IFBLK),
 331                                         (uintmax_t)vnu.vnu_ino);
 332                 }
 333         }
 334         close(vd);
 335         return 0;
 336 }
 337
 338 int
 339 config(struct vndisk *vnp)
 340 {
 341         char *dev, *file, *rdev, *oarg;
 342         FILE *f;
 343         struct vn_ioctl vnio;
 344         int flags, pgsize, rv, status;
 345         u_long l;
 346
 347         pgsize = getpagesize();
 348
 349         status = rv = 0;
 350
 351         /*
 352          * Prepend "/dev/" to the specified device name, if necessary.
 353          * Operate on vnp->dev because it is used later.
 354          */
 355         if (vnp->dev[0] != '/' && vnp->dev[0] != '.')
 356                 asprintf(&vnp->dev, "%s%s", _PATH_DEV, vnp->dev);
 357         dev = vnp->dev;
 358         file = vnp->file;
 359         flags = vnp->flags;
 360         oarg = vnp->oarg;
 361
 362         if (flags & VN_IGNORE)
 363                 return(0);
 364
 365         /*
 366          * When a regular file has been specified, do any requested setup
 367          * of the file.  Truncation (also creates the file if necessary),
 368          * sizing, and zeroing.
 369          */
 370
 371         if (file && vnp->size != 0 && (flags & VN_CONFIG)) {
 372                 int  fd;
 373                 struct stat st;
 374
 375                 if (flags & VN_TRUNCATE)
 376                         fd = open(file, O_RDWR|O_CREAT|O_TRUNC, 0600);
 377                 else
 378                         fd = open(file, O_RDWR);
 379                 if (fd >= 0 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
 380                         if (st.st_size < vnp->size * pgsize)
 381                                 ftruncate(fd, vnp->size * pgsize);
 382                         if (vnp->size != 0)
 383                                 st.st_size = vnp->size * pgsize;
 384
 385                         if (flags & VN_ZERO) {
 386                                 char *buf = malloc(ZBUFSIZE);
 387                                 bzero(buf, ZBUFSIZE);
 388                                 while (st.st_size > 0) {
 389                                         int n = (st.st_size > ZBUFSIZE) ?
 390                                             ZBUFSIZE : (int)st.st_size;
 391                                         if (write(fd, buf, n) != n) {
 392                                                 ftruncate(fd, 0);
 393                                                 printf("Unable to ZERO file "
 394                                                        "%s\n", file);
 395                                                 return(0);
 396                                         }
 397                                         st.st_size -= (off_t)n;
 398                                 }
 399                         }
 400                         close(fd);
 401                 } else {
 402                         printf("Unable to open file %s\n", file);
 403                         return(0);
 404                 }
 405         } else if (file == NULL && vnp->size == 0 && (flags & VN_CONFIG)) {
 406                 warnx("specify regular filename or swap size");
 407                 return (0);
 408         }
 409
 410         rdev = rawdevice(dev);
 411         f = fopen(rdev, "rw");
 412         if (f == NULL) {
 413                 warn("%s", dev);
 414                 return(1);
 415         }
 416         if (!strcmp(rdev, "/dev/vn")) {
 417                 printf("%s\n", fdevname(fileno(f)));
 418                 rv = asprintf(&dev, "%s%s", _PATH_DEV, fdevname(fileno(f)));
 419                 if (rv < 0)
 420                         dev = fdevname(fileno(f));
 421         }
 422
 423         vnio.vn_file = file;
 424         vnio.vn_size = vnp->size;       /* non-zero only if swap backed */
 425
 426         /*
 427          * Disable the device
 428          */
 429         if (flags & VN_DISABLE) {
 430                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 431                         rv = unmount(oarg, 0);
 432                         if (rv) {
 433                                 status--;
 434                                 if (errno == EBUSY)
 435                                         flags &= ~VN_UNCONFIG;
 436                                 if ((flags & VN_UNCONFIG) == 0)
 437                                         warn("umount");
 438                         } else if (verbose)
 439                                 printf("%s: unmounted\n", dev);
 440                 }
 441         }
 442         /*
 443          * Clear (un-configure) the device
 444          */
 445         if (flags & VN_UNCONFIG) {
 446                 rv = ioctl(fileno(f), VNIOCDETACH, &vnio);
 447                 if (rv) {
 448                         if (errno == ENODEV) {
 449                                 if (verbose)
 450                                         printf("%s: not configured\n", dev);
 451                                 rv = 0;
 452                         } else {
 453                                 status--;
 454                                 warn("VNIOCDETACH");
 455                         }
 456                 } else if (verbose)
 457                         printf("%s: cleared\n", dev);
 458         }
 459         /*
 460          * Set specified options
 461          */
 462         if (flags & VN_SET) {
 463                 l = setopt;
 464                 if (global)
 465                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 466                 else
 467                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 468                 if (rv) {
 469                         status--;
 470                         warn("VNIO[GU]SET");
 471                 } else if (verbose)
 472                         printf("%s: flags now=%08lx\n",dev,l);
 473         }
 474         /*
 475          * Reset specified options
 476          */
 477         if (flags & VN_RESET) {
 478                 l = resetopt;
 479                 if (global)
 480                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 481                 else
 482                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 483                 if (rv) {
 484                         status--;
 485                         warn("VNIO[GU]CLEAR");
 486                 } else if (verbose)
 487                         printf("%s: flags now=%08lx\n",dev,l);
 488         }
 489         /*
 490          * Configure the device
 491          */
 492         if (flags & VN_CONFIG) {
 493                 rv = ioctl(fileno(f), VNIOCATTACH, &vnio);
 494                 if (rv) {
 495                         status--;
 496                         warn("VNIOCATTACH");
 497                         flags &= ~VN_ENABLE;
 498                 } else {
 499                         if (verbose) {
 500                                 printf("%s: %s, ", dev, file);
 501                                 if (vnp->size != 0) {
 502                                         printf("%jd bytes mapped\n",
 503                                                (intmax_t)vnio.vn_size);
 504                                 } else {
 505                                         printf("complete file mapped\n");
 506                                 }
 507                         }
 508                         /*
 509                          * autolabel
 510                          */
 511                         if (vnp->autolabel) {
 512                                 do_autolabel(vnp->dev, vnp->autolabel);
 513                         }
 514                 }
 515         }
 516         /*
 517          * Set an option
 518          */
 519         if (flags & VN_SET) {
 520                 l = setopt;
 521                 if (global)
 522                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 523                 else
 524                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 525                 if (rv) {
 526                         status--;
 527                         warn("VNIO[GU]SET");
 528                 } else if (verbose)
 529                         printf("%s: flags now=%08lx\n",dev,l);
 530         }
 531         /*
 532          * Reset an option
 533          */
 534         if (flags & VN_RESET) {
 535                 l = resetopt;
 536                 if (global)
 537                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 538                 else
 539                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 540                 if (rv) {
 541                         status--;
 542                         warn("VNIO[GU]CLEAR");
 543                 } else if (verbose)
 544                         printf("%s: flags now=%08lx\n",dev,l);
 545         }
 546
 547         /*
 548          * Close the device now, as we may want to mount it.
 549          */
 550         fclose(f);
 551
 552         /*
 553          * Enable special functions on the device
 554          */
 555         if (flags & VN_ENABLE) {
 556                 if (flags & VN_SWAP) {
 557                         rv = swapon(dev);
 558                         if (rv) {
 559                                 status--;
 560                                 warn("swapon");
 561                         }
 562                         else if (verbose)
 563                                 printf("%s: swapping enabled\n", dev);
 564                 }
 565                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 566                         struct ufs_args args;
 567                         int mflags;
 568
 569                         args.fspec = dev;
 570                         mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
 571                         rv = mount("ufs", oarg, mflags, &args);
 572                         if (rv) {
 573                                 status--;
 574                                 warn("mount");
 575                         }
 576                         else if (verbose)
 577                                 printf("%s: mounted on %s\n", dev, oarg);
 578                 }
 579         }
 580 /* done: */
 581         fflush(stdout);
 582         return(status < 0);
 583 }
 584
 585 #define EOL(c)          ((c) == '\0' || (c) == '\n')
 586 #define WHITE(c)        ((c) == ' ' || (c) == '\t' || (c) == '\n')
 587
 588 void
 589 readconfig(int flags)
 590 {
 591         char buf[LINESIZE];
 592         FILE *f;
 593         char *cp, *sp;
 594         int ix;
 595         int ax;
 596
 597         f = fopen(configfile, "r");
 598         if (f == NULL)
 599                 err(1, "%s", configfile);
 600         ix = 0;         /* number of elements */
 601         ax = 0;         /* allocated elements */
 602         while (fgets(buf, LINESIZE, f) != NULL) {
 603                 cp = buf;
 604                 if (*cp == '#')
 605                         continue;
 606                 while (!EOL(*cp) && WHITE(*cp))
 607                         cp++;
 608                 if (EOL(*cp))
 609                         continue;
 610                 sp = cp;
 611                 while (!EOL(*cp) && !WHITE(*cp))
 612                         cp++;
 613                 if (EOL(*cp))
 614                         continue;
 615                 *cp++ = '\0';
 616
 617                 if (ix == ax) {
 618                         ax = ax + 16;
 619                         vndisks = realloc(vndisks, ax * sizeof(struct vndisk));
 620                         bzero(&vndisks[ix], (ax - ix) * sizeof(struct vndisk));
 621                 }
 622                 vndisks[ix].dev = malloc(cp - sp);
 623                 strcpy(vndisks[ix].dev, sp);
 624                 while (!EOL(*cp) && WHITE(*cp))
 625                         cp++;
 626                 if (EOL(*cp))
 627                         continue;
 628                 sp = cp;
 629                 while (!EOL(*cp) && !WHITE(*cp))
 630                         cp++;
 631                 *cp++ = '\0';
 632
 633                 if (*sp == '%' && strtol(sp + 1, NULL, 0) > 0) {
 634                         vndisks[ix].size = getsize(sp + 1);
 635                 } else {
 636                         vndisks[ix].file = malloc(cp - sp);
 637                         strcpy(vndisks[ix].file, sp);
 638                 }
 639
 640                 while (!EOL(*cp) && WHITE(*cp))
 641                         cp++;
 642                 vndisks[ix].flags = flags;
 643                 if (!EOL(*cp)) {
 644                         sp = cp;
 645                         while (!EOL(*cp) && !WHITE(*cp))
 646                                 cp++;
 647                         *cp++ = '\0';
 648                         getoptions(&vndisks[ix], sp);
 649                 }
 650                 nvndisks++;
 651                 ix++;
 652         }
 653 }
 654
 655 void
 656 getoptions(struct vndisk *vnp, const char *fstr)
 657 {
 658         int flags = 0;
 659         const char *oarg = NULL;
 660
 661         if (strcmp(fstr, "swap") == 0)
 662                 flags |= VN_SWAP;
 663         else if (strncmp(fstr, "mount=", 6) == 0) {
 664                 flags |= VN_MOUNTRW;
 665                 oarg = &fstr[6];
 666         } else if (strncmp(fstr, "mountrw=", 8) == 0) {
 667                 flags |= VN_MOUNTRW;
 668                 oarg = &fstr[8];
 669         } else if (strncmp(fstr, "mountro=", 8) == 0) {
 670                 flags |= VN_MOUNTRO;
 671                 oarg = &fstr[8];
 672         } else if (strcmp(fstr, "ignore") == 0)
 673                 flags |= VN_IGNORE;
 674         vnp->flags |= flags;
 675         if (oarg) {
 676                 vnp->oarg = malloc(strlen(oarg) + 1);
 677                 strcpy(vnp->oarg, oarg);
 678         } else
 679                 vnp->oarg = NULL;
 680 }
 681
 682 char *
 683 rawdevice(const char *dev)
 684 {
 685         char *rawbuf, *dp, *ep;
 686         struct stat sb;
 687         int len;
 688
 689         len = strlen(dev);
 690         rawbuf = malloc(len + 2);
 691         strcpy(rawbuf, dev);
 692         if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
 693                 dp = strrchr(rawbuf, '/');
 694                 if (dp) {
 695                         for (ep = &rawbuf[len]; ep > dp; --ep)
 696                                 *(ep+1) = *ep;
 697                         *++ep = 'r';
 698                 }
 699         }
 700         return (rawbuf);
 701 }
 702
 703 static void
 704 usage(void)
 705 {
 706         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 707                 "usage: vnconfig [-cdeguvTZ] [-s options] [-r options]",
 708                 "                [-S value] special_file [regular_file] [feature]",
 709                 "       vnconfig -a [-cdeguv] [-s options] [-r options] [-f config_file]",
 710                 "       vnconfig -l [special_file ...]");
 711         exit(1);
 712 }
 713
 714 static int64_t
 715 getsize(const char *arg)
 716 {
 717         char *ptr;
 718         int pgsize = getpagesize();
 719         int64_t size = strtoq(arg, &ptr, 0);
 720
 721         switch(tolower(*ptr)) {
 722         case 't':
 723                 /*
 724                  * GULP!  Terabytes.  It's actually possible to create
 725                  * a 7.9 TB VN device, though newfs can't handle any single
 726                  * filesystem larger then 1 TB.
 727                  */
 728                 size *= 1024;
 729                 /* fall through */
 730         case 'g':
 731                 size *= 1024;
 732                 /* fall through */
 733         default:
 734         case 'm':
 735                 size *= 1024;
 736                 /* fall through */
 737         case 'k':
 738                 size *= 1024;
 739                 /* fall through */
 740         case 'c':
 741                 break;
 742         }
 743         size = (size + pgsize - 1) / pgsize;
 744         return(size);
 745 }
 746
 747 /*
 748  * DO_AUTOLABEL
 749  *
 750  *      Automatically label the device.  This will wipe any preexisting
 751  *      label.
 752  */
 753
 754 static void
 755 do_autolabel(const char *dev __unused, const char *label __unused)
 756 {
 757         /* XXX not yet implemented */
 758         fprintf(stderr, "autolabel not yet implemented, sorry\n");
 759         exit(1);
 760 }
 761