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 %s\n", file);
 394                                                 return(0);
 395                                         }
 396                                         st.st_size -= (off_t)n;
 397                                 }
 398                         }
 399                         close(fd);
 400                 } else {
 401                         printf("Unable to open file %s\n", file);
 402                         return(0);
 403                 }
 404         } else if (file == NULL && vnp->size == 0 && (flags & VN_CONFIG)) {
 405                 warnx("specify regular filename or swap size");
 406                 return (0);
 407         }
 408
 409         rdev = rawdevice(dev);
 410         f = fopen(rdev, "rw");
 411         if (f == NULL) {
 412                 warn("%s", dev);
 413                 return(1);
 414         }
 415         if (!strcmp(rdev, "/dev/vn")) {
 416                 printf("%s\n", fdevname(fileno(f)));
 417                 rv = asprintf(&dev, "%s%s", _PATH_DEV, fdevname(fileno(f)));
 418                 if (rv < 0)
 419                         dev = fdevname(fileno(f));
 420         }
 421
 422         vnio.vn_file = file;
 423         vnio.vn_size = vnp->size;       /* non-zero only if swap backed */
 424
 425         /*
 426          * Disable the device
 427          */
 428         if (flags & VN_DISABLE) {
 429                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 430                         rv = unmount(oarg, 0);
 431                         if (rv) {
 432                                 status--;
 433                                 if (errno == EBUSY)
 434                                         flags &= ~VN_UNCONFIG;
 435                                 if ((flags & VN_UNCONFIG) == 0)
 436                                         warn("umount");
 437                         } else if (verbose)
 438                                 printf("%s: unmounted\n", dev);
 439                 }
 440         }
 441         /*
 442          * Clear (un-configure) the device
 443          */
 444         if (flags & VN_UNCONFIG) {
 445                 rv = ioctl(fileno(f), VNIOCDETACH, &vnio);
 446                 if (rv) {
 447                         if (errno == ENODEV) {
 448                                 if (verbose)
 449                                         printf("%s: not configured\n", dev);
 450                                 rv = 0;
 451                         } else {
 452                                 status--;
 453                                 warn("VNIOCDETACH");
 454                         }
 455                 } else if (verbose)
 456                         printf("%s: cleared\n", dev);
 457         }
 458         /*
 459          * Set specified options
 460          */
 461         if (flags & VN_SET) {
 462                 l = setopt;
 463                 if (global)
 464                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 465                 else
 466                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 467                 if (rv) {
 468                         status--;
 469                         warn("VNIO[GU]SET");
 470                 } else if (verbose)
 471                         printf("%s: flags now=%08lx\n",dev,l);
 472         }
 473         /*
 474          * Reset specified options
 475          */
 476         if (flags & VN_RESET) {
 477                 l = resetopt;
 478                 if (global)
 479                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 480                 else
 481                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 482                 if (rv) {
 483                         status--;
 484                         warn("VNIO[GU]CLEAR");
 485                 } else if (verbose)
 486                         printf("%s: flags now=%08lx\n",dev,l);
 487         }
 488         /*
 489          * Configure the device
 490          */
 491         if (flags & VN_CONFIG) {
 492                 rv = ioctl(fileno(f), VNIOCATTACH, &vnio);
 493                 if (rv) {
 494                         status--;
 495                         warn("VNIOCATTACH");
 496                         flags &= ~VN_ENABLE;
 497                 } else {
 498                         if (verbose) {
 499                                 printf("%s: %s, ", dev, file);
 500                                 if (vnp->size != 0) {
 501                                     printf("%jd bytes mapped\n", (intmax_t)vnio.vn_size);
 502                                 } else {
 503                                     printf("complete file mapped\n");
 504                                 }
 505                         }
 506                         /*
 507                          * autolabel
 508                          */
 509                         if (vnp->autolabel) {
 510                                 do_autolabel(vnp->dev, vnp->autolabel);
 511                         }
 512                 }
 513         }
 514         /*
 515          * Set an option
 516          */
 517         if (flags & VN_SET) {
 518                 l = setopt;
 519                 if (global)
 520                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 521                 else
 522                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 523                 if (rv) {
 524                         status--;
 525                         warn("VNIO[GU]SET");
 526                 } else if (verbose)
 527                         printf("%s: flags now=%08lx\n",dev,l);
 528         }
 529         /*
 530          * Reset an option
 531          */
 532         if (flags & VN_RESET) {
 533                 l = resetopt;
 534                 if (global)
 535                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 536                 else
 537                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 538                 if (rv) {
 539                         status--;
 540                         warn("VNIO[GU]CLEAR");
 541                 } else if (verbose)
 542                         printf("%s: flags now=%08lx\n",dev,l);
 543         }
 544
 545         /*
 546          * Close the device now, as we may want to mount it.
 547          */
 548         fclose(f);
 549
 550         /*
 551          * Enable special functions on the device
 552          */
 553         if (flags & VN_ENABLE) {
 554                 if (flags & VN_SWAP) {
 555                         rv = swapon(dev);
 556                         if (rv) {
 557                                 status--;
 558                                 warn("swapon");
 559                         }
 560                         else if (verbose)
 561                                 printf("%s: swapping enabled\n", dev);
 562                 }
 563                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 564                         struct ufs_args args;
 565                         int mflags;
 566
 567                         args.fspec = dev;
 568                         mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
 569                         rv = mount("ufs", oarg, mflags, &args);
 570                         if (rv) {
 571                                 status--;
 572                                 warn("mount");
 573                         }
 574                         else if (verbose)
 575                                 printf("%s: mounted on %s\n", dev, oarg);
 576                 }
 577         }
 578 /* done: */
 579         fflush(stdout);
 580         return(status < 0);
 581 }
 582
 583 #define EOL(c)          ((c) == '\0' || (c) == '\n')
 584 #define WHITE(c)        ((c) == ' ' || (c) == '\t' || (c) == '\n')
 585
 586 void
 587 readconfig(int flags)
 588 {
 589         char buf[LINESIZE];
 590         FILE *f;
 591         char *cp, *sp;
 592         int ix;
 593         int ax;
 594
 595         f = fopen(configfile, "r");
 596         if (f == NULL)
 597                 err(1, "%s", configfile);
 598         ix = 0;         /* number of elements */
 599         ax = 0;         /* allocated elements */
 600         while (fgets(buf, LINESIZE, f) != NULL) {
 601                 cp = buf;
 602                 if (*cp == '#')
 603                         continue;
 604                 while (!EOL(*cp) && WHITE(*cp))
 605                         cp++;
 606                 if (EOL(*cp))
 607                         continue;
 608                 sp = cp;
 609                 while (!EOL(*cp) && !WHITE(*cp))
 610                         cp++;
 611                 if (EOL(*cp))
 612                         continue;
 613                 *cp++ = '\0';
 614
 615                 if (ix == ax) {
 616                         ax = ax + 16;
 617                         vndisks = realloc(vndisks, ax * sizeof(struct vndisk));
 618                         bzero(&vndisks[ix], (ax - ix) * sizeof(struct vndisk));
 619                 }
 620                 vndisks[ix].dev = malloc(cp - sp);
 621                 strcpy(vndisks[ix].dev, sp);
 622                 while (!EOL(*cp) && WHITE(*cp))
 623                         cp++;
 624                 if (EOL(*cp))
 625                         continue;
 626                 sp = cp;
 627                 while (!EOL(*cp) && !WHITE(*cp))
 628                         cp++;
 629                 *cp++ = '\0';
 630
 631                 if (*sp == '%' && strtol(sp + 1, NULL, 0) > 0) {
 632                         vndisks[ix].size = getsize(sp + 1);
 633                 } else {
 634                         vndisks[ix].file = malloc(cp - sp);
 635                         strcpy(vndisks[ix].file, sp);
 636                 }
 637
 638                 while (!EOL(*cp) && WHITE(*cp))
 639                         cp++;
 640                 vndisks[ix].flags = flags;
 641                 if (!EOL(*cp)) {
 642                         sp = cp;
 643                         while (!EOL(*cp) && !WHITE(*cp))
 644                                 cp++;
 645                         *cp++ = '\0';
 646                         getoptions(&vndisks[ix], sp);
 647                 }
 648                 nvndisks++;
 649                 ix++;
 650         }
 651 }
 652
 653 void
 654 getoptions(struct vndisk *vnp, const char *fstr)
 655 {
 656         int flags = 0;
 657         const char *oarg = NULL;
 658
 659         if (strcmp(fstr, "swap") == 0)
 660                 flags |= VN_SWAP;
 661         else if (strncmp(fstr, "mount=", 6) == 0) {
 662                 flags |= VN_MOUNTRW;
 663                 oarg = &fstr[6];
 664         } else if (strncmp(fstr, "mountrw=", 8) == 0) {
 665                 flags |= VN_MOUNTRW;
 666                 oarg = &fstr[8];
 667         } else if (strncmp(fstr, "mountro=", 8) == 0) {
 668                 flags |= VN_MOUNTRO;
 669                 oarg = &fstr[8];
 670         } else if (strcmp(fstr, "ignore") == 0)
 671                 flags |= VN_IGNORE;
 672         vnp->flags |= flags;
 673         if (oarg) {
 674                 vnp->oarg = malloc(strlen(oarg) + 1);
 675                 strcpy(vnp->oarg, oarg);
 676         } else
 677                 vnp->oarg = NULL;
 678 }
 679
 680 char *
 681 rawdevice(const char *dev)
 682 {
 683         char *rawbuf, *dp, *ep;
 684         struct stat sb;
 685         int len;
 686
 687         len = strlen(dev);
 688         rawbuf = malloc(len + 2);
 689         strcpy(rawbuf, dev);
 690         if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
 691                 dp = strrchr(rawbuf, '/');
 692                 if (dp) {
 693                         for (ep = &rawbuf[len]; ep > dp; --ep)
 694                                 *(ep+1) = *ep;
 695                         *++ep = 'r';
 696                 }
 697         }
 698         return (rawbuf);
 699 }
 700
 701 static void
 702 usage(void)
 703 {
 704         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 705                 "usage: vnconfig [-cdeguvTZ] [-s options] [-r options]",
 706                 "                [-S value] special_file [regular_file] [feature]",
 707                 "       vnconfig -a [-cdeguv] [-s options] [-r options] [-f config_file]",
 708                 "       vnconfig -l [special_file ...]");
 709         exit(1);
 710 }
 711
 712 static int64_t
 713 getsize(const char *arg)
 714 {
 715         char *ptr;
 716         int pgsize = getpagesize();
 717         int64_t size = strtoq(arg, &ptr, 0);
 718
 719         switch(tolower(*ptr)) {
 720         case 't':
 721                 /*
 722                  * GULP!  Terabytes.  It's actually possible to create
 723                  * a 7.9 TB VN device, though newfs can't handle any single
 724                  * filesystem larger then 1 TB.
 725                  */
 726                 size *= 1024;
 727                 /* fall through */
 728         case 'g':
 729                 size *= 1024;
 730                 /* fall through */
 731         default:
 732         case 'm':
 733                 size *= 1024;
 734                 /* fall through */
 735         case 'k':
 736                 size *= 1024;
 737                 /* fall through */
 738         case 'c':
 739                 break;
 740         }
 741         size = (size + pgsize - 1) / pgsize;
 742         return(size);
 743 }
 744
 745 /*
 746  * DO_AUTOLABEL
 747  *
 748  *      Automatically label the device.  This will wipe any preexisting
 749  *      label.
 750  */
 751
 752 static void
 753 do_autolabel(const char *dev __unused, const char *label __unused)
 754 {
 755         /* XXX not yet implemented */
 756         fprintf(stderr, "autolabel not yet implemented, sorry\n");
 757         exit(1);
 758 }
 759