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 char *configfile;
  97
  98 int config(struct vndisk *);
  99 void getoptions(struct vndisk *, char *);
 100 int getinfo(const char *vname);
 101 char *rawdevice(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(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         if (listopt) {
 214                 if(argc > optind)
 215                         while(argc > optind)
 216                                 rv += getinfo( argv[optind++]);
 217                 else {
 218                         rv = getinfo( NULL );
 219                 }
 220                 exit(rv);
 221         }
 222
 223         if (flags == 0)
 224                 flags = VN_CONFIG;
 225         if (all) {
 226                 readconfig(flags);
 227         } else {
 228                 vndisks = calloc(sizeof(struct vndisk), 1);
 229                 if (argc < optind + 1)
 230                         usage();
 231                 vndisks[0].dev = argv[optind++];
 232                 vndisks[0].file = argv[optind++];       /* may be NULL */
 233                 vndisks[0].flags = flags;
 234                 vndisks[0].size = size;
 235                 vndisks[0].autolabel = autolabel;
 236                 if (optind < argc)
 237                         getoptions(&vndisks[0], argv[optind]);
 238                 nvndisks = 1;
 239         }
 240         rv = 0;
 241         for (i = 0; i < nvndisks; i++)
 242                 rv += config(&vndisks[i]);
 243         exit(rv);
 244 }
 245
 246 int
 247 what_opt(char *str, u_long *p)
 248 {
 249         if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
 250         if (!strcmp(str,"labels")) { *p |= VN_LABELS; return 0; }
 251         if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }
 252         if (!strcmp(str,"debug")) { *p |= VN_DEBUG; return 0; }
 253         if (!strcmp(str,"io")) { *p |= VN_IO; return 0; }
 254         if (!strcmp(str,"all")) { *p |= ~0; return 0; }
 255         if (!strcmp(str,"none")) { *p |= 0; return 0; }
 256         return 1;
 257 }
 258
 259 /*
 260  *
 261  * GETINFO
 262  *
 263  *      Print vnode disk information to stdout for the device at
 264  *      path 'vname', or all existing 'vn' devices if none is given.
 265  *      Any 'vn' devices must exist under /dev in order to be queried.
 266  *
 267  *      Todo: correctly use vm_secsize for swap-backed vn's ..
 268  */
 269
 270 int
 271 getinfo( const char *vname )
 272 {
 273         int i, vd, printlim = 0;
 274         char vnpath[PATH_MAX], *tmp;
 275
 276         struct vn_user vnu;
 277         struct stat sb;
 278
 279         if (vname == NULL) {
 280                 i = 0;
 281                 printlim = 1024;
 282         }
 283         else {
 284                 tmp = (char *) 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 == NULL) {
 294                         printf("unknown vn device: %s", vname);
 295                         return 1;
 296                 }
 297         }
 298
 299         snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", i);
 300
 301         vd = open((char *)vnpath, O_RDONLY);
 302         if (vd < 0) {
 303                 err(1, "open: %s", vnpath);
 304                 return 1;
 305         }
 306
 307         for (i; i<printlim; i++) {
 308
 309                 bzero((void *) &vnpath, sizeof(vnpath));
 310                 bzero((void *) &sb, sizeof(struct stat));
 311                 bzero((void *) &vnu, sizeof(struct vn_user));
 312
 313                 vnu.vnu_unit = i;
 314
 315                 snprintf(vnpath, sizeof(vnpath), "/dev/vn%d", vnu.vnu_unit);
 316
 317                 if(stat(vnpath, &sb) < 0)
 318                         break;
 319                 else {
 320                         if (ioctl(vd, VNIOCGET, &vnu) == -1) {
 321                                 if (errno != ENXIO) {
 322                                         err(1, "ioctl: %s", vname);
 323                                         close(vd);
 324                                         return 1;
 325                                 }
 326                         }
 327
 328                         fprintf(stdout, "vn%d: ", vnu.vnu_unit);
 329
 330                         if (vnu.vnu_file[0] == 0)
 331                                 fprintf(stdout, "not in use\n");
 332                         else if ((strcmp(vnu.vnu_file, _VN_USER_SWAP)) == 0)
 333                                 fprintf(stdout,
 334                                         "consuming %d VM pages\n",
 335                                         vnu.vnu_size);
 336                         else
 337                                 fprintf(stdout,
 338                                         "covering %s on %s, inode %ju\n",
 339                                         vnu.vnu_file,
 340                                         devname(vnu.vnu_dev, S_IFBLK),
 341                                         (uintmax_t)vnu.vnu_ino);
 342                 }
 343         }
 344         close(vd);
 345         return 0;
 346 }
 347
 348 int
 349 config(struct vndisk *vnp)
 350 {
 351         char *dev, *file, *rdev, *oarg;
 352         FILE *f;
 353         struct vn_ioctl vnio;
 354         int flags, pgsize, rv, status;
 355         u_long l;
 356
 357         pgsize = getpagesize();
 358
 359         status = rv = 0;
 360
 361         /*
 362          * Prepend "/dev/" to the specified device name, if necessary.
 363          * Operate on vnp->dev because it is used later.
 364          */
 365         if (vnp->dev[0] != '/' && vnp->dev[0] != '.')
 366                 asprintf(&vnp->dev, "%s%s", _PATH_DEV, vnp->dev);
 367         dev = vnp->dev;
 368         file = vnp->file;
 369         flags = vnp->flags;
 370         oarg = vnp->oarg;
 371
 372         if (flags & VN_IGNORE)
 373                 return(0);
 374
 375         /*
 376          * When a regular file has been specified, do any requested setup
 377          * of the file.  Truncation (also creates the file if necessary),
 378          * sizing, and zeroing.
 379          */
 380
 381         if (file && vnp->size != 0 && (flags & VN_CONFIG)) {
 382                 int  fd;
 383                 struct stat st;
 384
 385                 if (flags & VN_TRUNCATE)
 386                         fd = open(file, O_RDWR|O_CREAT|O_TRUNC, 0600);
 387                 else
 388                         fd = open(file, O_RDWR);
 389                 if (fd >= 0 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
 390                         if (st.st_size < vnp->size * pgsize)
 391                                 ftruncate(fd, vnp->size * pgsize);
 392                         if (vnp->size != 0)
 393                                 st.st_size = vnp->size * pgsize;
 394
 395                         if (flags & VN_ZERO) {
 396                                 char *buf = malloc(ZBUFSIZE);
 397                                 bzero(buf, ZBUFSIZE);
 398                                 while (st.st_size > 0) {
 399                                         int n = (st.st_size > ZBUFSIZE) ?
 400                                             ZBUFSIZE : (int)st.st_size;
 401                                         if (write(fd, buf, n) != n) {
 402                                                 ftruncate(fd, 0);
 403                                                 printf("Unable to ZERO file %s\n", file);
 404                                                 return(0);
 405                                         }
 406                                         st.st_size -= (off_t)n;
 407                                 }
 408                         }
 409                         close(fd);
 410                 } else {
 411                         printf("Unable to open file %s\n", file);
 412                         return(0);
 413                 }
 414         } else if (file == NULL && vnp->size == 0 && (flags & VN_CONFIG)) {
 415                 warnx("specify regular filename or swap size");
 416                 return (0);
 417         }
 418
 419         rdev = rawdevice(dev);
 420         f = fopen(rdev, "rw");
 421         if (f == NULL) {
 422                 warn("%s", dev);
 423                 return(1);
 424         }
 425         vnio.vn_file = file;
 426         vnio.vn_size = vnp->size;       /* non-zero only if swap backed */
 427
 428         /*
 429          * Disable the device
 430          */
 431         if (flags & VN_DISABLE) {
 432                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 433                         rv = unmount(oarg, 0);
 434                         if (rv) {
 435                                 status--;
 436                                 if (errno == EBUSY)
 437                                         flags &= ~VN_UNCONFIG;
 438                                 if ((flags & VN_UNCONFIG) == 0)
 439                                         warn("umount");
 440                         } else if (verbose)
 441                                 printf("%s: unmounted\n", dev);
 442                 }
 443         }
 444         /*
 445          * Clear (un-configure) the device
 446          */
 447         if (flags & VN_UNCONFIG) {
 448                 rv = ioctl(fileno(f), VNIOCDETACH, &vnio);
 449                 if (rv) {
 450                         if (errno == ENODEV) {
 451                                 if (verbose)
 452                                         printf("%s: not configured\n", dev);
 453                                 rv = 0;
 454                         } else {
 455                                 status--;
 456                                 warn("VNIOCDETACH");
 457                         }
 458                 } else if (verbose)
 459                         printf("%s: cleared\n", dev);
 460         }
 461         /*
 462          * Set specified options
 463          */
 464         if (flags & VN_SET) {
 465                 l = setopt;
 466                 if (global)
 467                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 468                 else
 469                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 470                 if (rv) {
 471                         status--;
 472                         warn("VNIO[GU]SET");
 473                 } else if (verbose)
 474                         printf("%s: flags now=%08x\n",dev,l);
 475         }
 476         /*
 477          * Reset specified options
 478          */
 479         if (flags & VN_RESET) {
 480                 l = resetopt;
 481                 if (global)
 482                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 483                 else
 484                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 485                 if (rv) {
 486                         status--;
 487                         warn("VNIO[GU]CLEAR");
 488                 } else if (verbose)
 489                         printf("%s: flags now=%08x\n",dev,l);
 490         }
 491         /*
 492          * Configure the device
 493          */
 494         if (flags & VN_CONFIG) {
 495                 rv = ioctl(fileno(f), VNIOCATTACH, &vnio);
 496                 if (rv) {
 497                         status--;
 498                         warn("VNIOCATTACH");
 499                         flags &= ~VN_ENABLE;
 500                 } else {
 501                         if (verbose) {
 502                                 printf("%s: %s, ", dev, file);
 503                                 if (vnp->size != 0) {
 504                                     printf("%lld bytes mapped\n", vnio.vn_size);
 505                                 } else {
 506                                     printf("complete file mapped\n");
 507                                 }
 508                         }
 509                         /*
 510                          * autolabel
 511                          */
 512                         if (vnp->autolabel) {
 513                                 do_autolabel(vnp->dev, vnp->autolabel);
 514                         }
 515                 }
 516         }
 517         /*
 518          * Set an option
 519          */
 520         if (flags & VN_SET) {
 521                 l = setopt;
 522                 if (global)
 523                         rv = ioctl(fileno(f), VNIOCGSET, &l);
 524                 else
 525                         rv = ioctl(fileno(f), VNIOCUSET, &l);
 526                 if (rv) {
 527                         status--;
 528                         warn("VNIO[GU]SET");
 529                 } else if (verbose)
 530                         printf("%s: flags now=%08lx\n",dev,l);
 531         }
 532         /*
 533          * Reset an option
 534          */
 535         if (flags & VN_RESET) {
 536                 l = resetopt;
 537                 if (global)
 538                         rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
 539                 else
 540                         rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
 541                 if (rv) {
 542                         status--;
 543                         warn("VNIO[GU]CLEAR");
 544                 } else if (verbose)
 545                         printf("%s: flags now=%08lx\n",dev,l);
 546         }
 547
 548         /*
 549          * Close the device now, as we may want to mount it.
 550          */
 551         fclose(f);
 552
 553         /*
 554          * Enable special functions on the device
 555          */
 556         if (flags & VN_ENABLE) {
 557                 if (flags & VN_SWAP) {
 558                         rv = swapon(dev);
 559                         if (rv) {
 560                                 status--;
 561                                 warn("swapon");
 562                         }
 563                         else if (verbose)
 564                                 printf("%s: swapping enabled\n", dev);
 565                 }
 566                 if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
 567                         struct ufs_args args;
 568                         int mflags;
 569
 570                         args.fspec = dev;
 571                         mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
 572                         rv = mount("ufs", oarg, mflags, &args);
 573                         if (rv) {
 574                                 status--;
 575                                 warn("mount");
 576                         }
 577                         else if (verbose)
 578                                 printf("%s: mounted on %s\n", dev, oarg);
 579                 }
 580         }
 581 /* done: */
 582         fflush(stdout);
 583         return(status < 0);
 584 }
 585
 586 #define EOL(c)          ((c) == '\0' || (c) == '\n')
 587 #define WHITE(c)        ((c) == ' ' || (c) == '\t' || (c) == '\n')
 588
 589 void
 590 readconfig(int flags)
 591 {
 592         char buf[LINESIZE];
 593         FILE *f;
 594         char *cp, *sp;
 595         int ix;
 596         int ax;
 597
 598         f = fopen(configfile, "r");
 599         if (f == NULL)
 600                 err(1, "%s", configfile);
 601         ix = 0;         /* number of elements */
 602         ax = 0;         /* allocated elements */
 603         while (fgets(buf, LINESIZE, f) != NULL) {
 604                 cp = buf;
 605                 if (*cp == '#')
 606                         continue;
 607                 while (!EOL(*cp) && WHITE(*cp))
 608                         cp++;
 609                 if (EOL(*cp))
 610                         continue;
 611                 sp = cp;
 612                 while (!EOL(*cp) && !WHITE(*cp))
 613                         cp++;
 614                 if (EOL(*cp))
 615                         continue;
 616                 *cp++ = '\0';
 617
 618                 if (ix == ax) {
 619                         ax = ax + 16;
 620                         vndisks = realloc(vndisks, ax * sizeof(struct vndisk));
 621                         bzero(&vndisks[ix], (ax - ix) * sizeof(struct vndisk));
 622                 }
 623                 vndisks[ix].dev = malloc(cp - sp);
 624                 strcpy(vndisks[ix].dev, sp);
 625                 while (!EOL(*cp) && WHITE(*cp))
 626                         cp++;
 627                 if (EOL(*cp))
 628                         continue;
 629                 sp = cp;
 630                 while (!EOL(*cp) && !WHITE(*cp))
 631                         cp++;
 632                 *cp++ = '\0';
 633
 634                 if (*sp == '%' && strtol(sp + 1, NULL, 0) > 0) {
 635                         vndisks[ix].size = getsize(sp + 1);
 636                 } else {
 637                         vndisks[ix].file = malloc(cp - sp);
 638                         strcpy(vndisks[ix].file, sp);
 639                 }
 640
 641                 while (!EOL(*cp) && WHITE(*cp))
 642                         cp++;
 643                 vndisks[ix].flags = flags;
 644                 if (!EOL(*cp)) {
 645                         sp = cp;
 646                         while (!EOL(*cp) && !WHITE(*cp))
 647                                 cp++;
 648                         *cp++ = '\0';
 649                         getoptions(&vndisks[ix], sp);
 650                 }
 651                 nvndisks++;
 652                 ix++;
 653         }
 654 }
 655
 656 void
 657 getoptions(struct vndisk *vnp, char *fstr)
 658 {
 659         int flags = 0;
 660         char *oarg = NULL;
 661
 662         if (strcmp(fstr, "swap") == 0)
 663                 flags |= VN_SWAP;
 664         else if (strncmp(fstr, "mount=", 6) == 0) {
 665                 flags |= VN_MOUNTRW;
 666                 oarg = &fstr[6];
 667         } else if (strncmp(fstr, "mountrw=", 8) == 0) {
 668                 flags |= VN_MOUNTRW;
 669                 oarg = &fstr[8];
 670         } else if (strncmp(fstr, "mountro=", 8) == 0) {
 671                 flags |= VN_MOUNTRO;
 672                 oarg = &fstr[8];
 673         } else if (strcmp(fstr, "ignore") == 0)
 674                 flags |= VN_IGNORE;
 675         vnp->flags |= flags;
 676         if (oarg) {
 677                 vnp->oarg = malloc(strlen(oarg) + 1);
 678                 strcpy(vnp->oarg, oarg);
 679         } else
 680                 vnp->oarg = NULL;
 681 }
 682
 683 char *
 684 rawdevice(char *dev)
 685 {
 686         char *rawbuf, *dp, *ep;
 687         struct stat sb;
 688         int len;
 689
 690         len = strlen(dev);
 691         rawbuf = malloc(len + 2);
 692         strcpy(rawbuf, dev);
 693         if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
 694                 dp = strrchr(rawbuf, '/');
 695                 if (dp) {
 696                         for (ep = &rawbuf[len]; ep > dp; --ep)
 697                                 *(ep+1) = *ep;
 698                         *++ep = 'r';
 699                 }
 700         }
 701         return (rawbuf);
 702 }
 703
 704 static void
 705 usage(void)
 706 {
 707         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 708                 "usage: vnconfig [-cdeguvTZ] [-s options] [-r options]",
 709                 "                [-S value] special_file [regular_file] [feature]",
 710                 "       vnconfig -a [-cdeguv] [-s options] [-r options] [-f config_file]",
 711                 "       vnconfig -l [special_file ...]");
 712         exit(1);
 713 }
 714
 715 static int64_t
 716 getsize(const char *arg)
 717 {
 718         char *ptr;
 719         int pgsize = getpagesize();
 720         int64_t size = strtoq(arg, &ptr, 0);
 721
 722         switch(tolower(*ptr)) {
 723         case 't':
 724                 /*
 725                  * GULP!  Terrabytes.  It's actually possible to create
 726                  * a 7.9 TB VN device, though newfs can't handle any single
 727                  * filesystem larger then 1 TB.
 728                  */
 729                 size *= 1024;
 730                 /* fall through */
 731         case 'g':
 732                 size *= 1024;
 733                 /* fall through */
 734         default:
 735         case 'm':
 736                 size *= 1024;
 737                 /* fall through */
 738         case 'k':
 739                 size *= 1024;
 740                 /* fall through */
 741         case 'c':
 742                 break;
 743         }
 744         size = (size + pgsize - 1) / pgsize;
 745         return(size);
 746 }
 747
 748 /*
 749  * DO_AUTOLABEL
 750  *
 751  *      Automatically label the device.  This will wipe any preexisting
 752  *      label.
 753  */
 754
 755 static void
 756 do_autolabel(const char *dev, const char *label)
 757 {
 758         /* XXX not yet implemented */
 759         fprintf(stderr, "autolabel not yet implemented, sorry\n");
 760         exit(1);
 761 }
 762