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