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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * from: Utah $Hdr: vnconfig.c 1.1 93/12/15$
  39  *
  40  * @(#)vnconfig.c       8.1 (Berkeley) 12/15/93
  41  * $FreeBSD: src/usr.sbin/vnconfig/vnconfig.c,v 1.13.2.7 2003/06/02 09:10:27 maxim Exp $
  42  * $DragonFly: src/usr.sbin/vnconfig/vnconfig.c,v 1.15 2008/07/27 22:36:01 thomas Exp $
  43  */
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <errno.h>
  48 #include <paths.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <fcntl.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <sys/param.h>
  55 #include <sys/ioctl.h>
  56 #include <sys/linker.h>
  57 #include <sys/mount.h>
  58 #include <sys/module.h>
  59 #include <sys/stat.h>
  60 #include <sys/vnioctl.h>
  61 #include <vfs/ufs/ufsmount.h>
  62
  63 #define LINESIZE        1024
  64 #define ZBUFSIZE        32768
  65
  66 struct vndisk {
  67         char    *dev;
  68         char    *file;
  69         char    *autolabel;
  70         int     flags;
  71         int64_t size;
  72         char    *oarg;
  73 } *vndisks;
  74
  75 #define VN_CONFIG       0x01
  76 #define VN_UNCONFIG     0x02
  77 #define VN_ENABLE       0x04
  78 #define VN_DISABLE      0x08
  79 #define VN_SWAP         0x10
  80 #define VN_MOUNTRO      0x20
  81 #define VN_MOUNTRW      0x40
  82 #define VN_IGNORE       0x80
  83 #define VN_SET          0x100
  84 #define VN_RESET        0x200
  85 #define VN_TRUNCATE     0x400
  86 #define VN_ZERO         0x800
  87
  88 int nvndisks;
  89
  90 int all = 0;
  91 int verbose = 0;
  92 int global = 0;
  93 int listopt = 0;
  94 u_long setopt = 0;
  95 u_long resetopt = 0;
  96 const char *configfile;
  97
  98 int config(struct vndisk *);
  99 void getoptions(struct vndisk *, const char *);
 100 int getinfo(const char *vname);
 101 char *rawdevice(const char *);
 102 void readconfig(int);
 103 static void usage(void);
 104 static int64_t getsize(const char *arg);
 105 static void do_autolabel(const char *dev, const char *label);
 106 int what_opt(const char *, u_long *);
 107
 108 int
 109 main(int argc, char *argv[])
 110 {
 111         int i, rv;
 112         int flags = 0;
 113         int64_t size = 0;
 114         char *autolabel = NULL;
 115         char *s;
 116
 117         configfile = _PATH_VNTAB;
 118         while ((i = getopt(argc, argv, "acdef:glr:s:S:TZL:uv")) != -1)
 119                 switch (i) {
 120
 121                 /* all -- use config file */
 122                 case 'a':
 123                         all++;
 124                         break;
 125
 126                 /* configure */
 127                 case 'c':
 128                         flags |= VN_CONFIG;
 129                         flags &= ~VN_UNCONFIG;
 130                         break;
 131
 132                 /* disable */
 133                 case 'd':
 134                         flags |= VN_DISABLE;
 135                         flags &= ~VN_ENABLE;
 136                         break;
 137
 138                 /* enable */
 139                 case 'e':
 140                         flags |= (VN_ENABLE|VN_CONFIG);
 141                         flags &= ~(VN_DISABLE|VN_UNCONFIG);
 142                         break;
 143
 144                 /* alternate config file */
 145                 case 'f':
 146                         configfile = optarg;
 147                         break;
 148
 149                 /* fiddle global options */
 150                 case 'g':
 151                         global = 1 - global;
 152                         break;
 153
 154                 /* reset options */
 155                 case 'r':
 156                         for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
 157                                 if (what_opt(s, &resetopt))
 158                                         errx(1, "invalid options '%s'", s);
 159                         }
 160                         flags |= VN_RESET;
 161                         break;
 162
 163                 case 'l':
 164                         listopt = 1;
 165                         break;
 166
 167                 /* set options */
 168                 case 's':
 169                         for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
 170                                 if (what_opt(s, &setopt))
 171                                         errx(1, "invalid options '%s'", s);
 172                         }
 173                         flags |= VN_SET;
 174                         break;
 175
 176                 /* unconfigure */
 177                 case 'u':
 178                         flags |= (VN_DISABLE|VN_UNCONFIG);
 179                         flags &= ~(VN_ENABLE|VN_CONFIG);
 180                         break;
 181
 182                 /* verbose */
 183                 case 'v':
 184                         verbose++;
 185                         break;
 186
 187                 case 'S':
 188                         size = getsize(optarg);
 189                         flags |= VN_CONFIG;
 190                         flags &= ~VN_UNCONFIG;
 191                         break;
 192
 193                 case 'T':
 194                         flags |= VN_TRUNCATE;
 195                         break;
 196
 197                 case 'Z':
 198                         flags |= VN_ZERO;
 199                         break;
 200
 201                 case 'L':
 202                         autolabel = optarg;
 203                         break;
 204
 205                 default:
 206                         usage();
 207                 }
 208
 209         if (modfind("vn") < 0)
 210                 if (kldload("vn") < 0 || modfind("vn") < 0)
 211                         warnx( "cannot find or load \"vn\" kernel module");
 212
 213         rv = 0;
 214         if (listopt) {
 215                 if(argc > optind)
 216                         while(argc > optind)
 217                                 rv += getinfo( argv[optind++]);
 218                 else {
 219                         rv = getinfo( NULL );
 220                 }
 221                 exit(rv);
 222         }
 223
 224         if (flags == 0)
 225                 flags = VN_CONFIG;
 226         if (all) {
 227                 readconfig(flags);
 228         } else {
 229                 vndisks = calloc(sizeof(struct vndisk), 1);
 230                 if (argc < optind + 1)
 231                         usage();
 232                 vndisks[0].dev = argv[optind++];
 233                 vndisks[0].file = argv[optind++];       /* may be NULL */
 234                 vndisks[0].flags = flags;
 235                 vndisks[0].size = size;
 236                 vndisks[0].autolabel = autolabel;
 237                 if (optind < argc)
 238                         getoptions(&vndisks[0], argv[optind]);
 239                 nvndisks = 1;
 240         }
 241         rv = 0;
 242         for (i = 0; i < nvndisks; i++)
 243                 rv += config(&vndisks[i]);
 244         exit(rv);
 245 }
 246
 247 int
 248 what_opt(const char *str, u_long *p)
 249 {
 250         if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
 251         if (!strcmp(str,"labels")) { return 0; }        /* deprecated */
 252         if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }
 253         if (!strcmp(str,"debug")) { *p |= VN_DEBUG; return 0; }
 254         if (!strcmp(str,"io")) { *p |= VN_IO; return 0; }
 255         if (!strcmp(str,"all")) { *p |= ~0; return 0; }
 256         if (!strcmp(str,"none")) { *p |= 0; return 0; }
 257         return 1;
 258 }
 259
 260 /*
 261  *
 262  * GETINFO
 263  *
 264  *      Print vnode disk information to stdout for the device at
 265  *      path 'vname', or all existing 'vn' devices if none is given.
 266  *      Any 'vn' devices must exist under /dev in order to be queried.
 267  *
 268  *      Todo: correctly use vm_secsize for swap-backed vn's ..
 269  */
 270
 271 int
 272 getinfo( const char *vname )
 273 {
 274         int i = 0, vd, printlim = 0;
 275         char vnpath[PATH_MAX];
 276         const char *tmp;
 277
 278         struct vn_user vnu;
 279         struct stat sb;
 280
 281         if (vname == NULL) {
 282                 printlim = 1024;
 283         } else {
 284                 tmp = vname;
 285                 while (*tmp != 0) {
 286                         if(isdigit(*tmp)){
 287                                 i = atoi(tmp);
 288                                 printlim = i + 1;
 289                                 break;
 290                         }
 291                         tmp++;
 292                 }
 293                 if (*tmp == '\0')
 294                         errx(1, "unknown vn device: %s", vname);
 295         }
 296
 297         snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", i);
 298
 299         vd = open(vnpath, O_RDONLY);
 300         if (vd < 0)
 301                 err(1, "open: %s", vnpath);
 302
 303         for (; i<printlim; i++) {
 304
 305                 bzero(&vnpath, sizeof(vnpath));
 306                 bzero(&sb, sizeof(struct stat));
 307                 bzero(&vnu, sizeof(struct vn_user));
 308
 309                 vnu.vnu_unit = i;
 310
 311                 snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", vnu.vnu_unit);
 312
 313                 if(stat(vnpath, &sb) < 0) {
 314                         break;
 315                 }
 316                 else {
 317                         if (ioctl(vd, VNIOCGET, &vnu) == -1) {
 318                                 warn("vn%d: ioctl", i);
 319                                         continue;
 320                         }
 321
 322                         fprintf(stdout, "vn%d: ", vnu.vnu_unit);
 323
 324                         if (vnu.vnu_file[0] == 0)
 325                                 fprintf(stdout, "not in use\n");
 326                         else if ((strcmp(vnu.vnu_file, _VN_USER_SWAP)) == 0)
 327                                 fprintf(stdout,
 328                                         "consuming %jd VM pages\n",
 329                                         (intmax_t)vnu.vnu_size);
 330                         else
 331                                 fprintf(stdout,
 332                                         "covering %s on %s, inode %ju\n",
 333                                         vnu.vnu_file,
 334                                         devname(vnu.vnu_dev, S_IFBLK),
 335                                         (uintmax_t)vnu.vnu_ino);
 336                 }
 337         }
 338         close(vd);
 339         return 0;
 340 }
 341
 342 int
 343 config(struct vndisk *vnp)
 344 {
 345         char *dev, *file, *rdev, *oarg;
 346         FILE *f;
 347         struct vn_ioctl vnio;
 348         int flags, pgsize, rv, status;
 349         u_long l;
 350
 351         pgsize = getpagesize();
 352
 353         status = rv = 0;
 354
 355         /*
 356          * Prepend "/dev/" to the specified device name, if necessary.
 357          * Operate on vnp->dev because it is used later.
 358          */
 359         if (vnp->dev[0] != '/' && vnp->dev[0] != '.')
 360                 asprintf(&vnp->dev, "%s%s", _PATH_DEV, vnp->dev);
 361         dev = vnp->dev;
 362         file = vnp->file;
 363         flags = vnp->flags;
 364         oarg = vnp->oarg;
 365
 366         if (flags & VN_IGNORE)
 367                 return(0);
 368
 369         /*
 370          * When a regular file has been specified, do any requested setup
 371          * of the file.  Truncation (also creates the file if necessary),
 372          * sizing, and zeroing.
 373          */
 374
 375         if (file && vnp->size != 0 && (flags & VN_CONFIG)) {
 376                 int  fd;
 377                 struct stat st;
 378
 379                 if (flags & VN_TRUNCATE)
 380                         fd = open(file, O_RDWR|O_CREAT|O_TRUNC, 0600);
 381                 else
 382                         fd = open(file, O_RDWR);
 383                 if (fd >= 0 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
 384                         if (st.st_size < vnp->size * pgsize)
 385                                 ftruncate(fd, vnp->size * pgsize);
 386                         if (vnp->size != 0)
 387                                 st.st_size = vnp->size * pgsize;
 388
 389                         if (flags & VN_ZERO) {
 390                                 char *buf = malloc(ZBUFSIZE);
 391                                 bzero(buf, ZBUFSIZE);
 392                                 while (st.st_size > 0) {
 393                                         int n = (st.st_size > ZBUFSIZE) ?
 394                                             ZBUFSIZE : (int)st.st_size;
 395                                         if (write(fd, buf, n) != n) {
 396                                                 ftruncate(fd, 0);
 397                                                 printf("Unable to ZERO file %s\n", file);
 398                                                 return(0);
 399                                         }
 400                                         st.st_size -= (off_t)n;
 401                                 }
 402                         }
 403                         close(fd);
 404                 } else {
 405                         printf("Unable to open file %s\n", file);
 406                         return(0);
 407                 }
 408         } else if (file == NULL && vnp->size == 0 && (flags & VN_CONFIG)) {
 409                 warnx("specify regular filename or swap size");
 410                 return (0);
 411         }
 412
 413         rdev = rawdevice(dev);
 414         f = fopen(rdev, "rw");
 415         if (f == NULL) {
 416                 warn("%s", dev);
 417                 return(1);
 418         }
 419         if (!strcmp(rdev, "/dev/vn"))
 420                 printf("Using: %s\n", fdevname(fileno(f)));
 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