mount.c revision 1.103
1 /* $NetBSD: mount.c,v 1.103 2020/10/18 10:57:30 mlelstv Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1989, 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; 41 #else 42 __RCSID("$NetBSD: mount.c,v 1.103 2020/10/18 10:57:30 mlelstv Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/mount.h> 48 #include <sys/wait.h> 49 50 #include <fs/puffs/puffs_msgif.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fstab.h> 55 #include <pwd.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 #include <util.h> 62 63 #define MOUNTNAMES 64 #include <fcntl.h> 65 #include <sys/disk.h> 66 #include <sys/disklabel.h> 67 #include <sys/ioctl.h> 68 69 #include "pathnames.h" 70 #include "mountprog.h" 71 72 static int debug, verbose; 73 74 static void catopt(char **, const char *); 75 static const char * 76 getfslab(const char *str); 77 static struct statvfs * 78 getmntpt(const char *); 79 static int getmntargs(struct statvfs *, char *, size_t); 80 static int hasopt(const char *, const char *); 81 static void mangle(char *, int *, const char ** volatile *, int *); 82 static int mountfs(const char *, const char *, const char *, 83 int, const char *, const char *, int, char *, size_t); 84 static void prmount(struct statvfs *); 85 __dead static void usage(void); 86 87 88 /* Map from mount options to printable formats. */ 89 static const struct opt { 90 int o_opt; 91 int o_silent; 92 const char *o_name; 93 } optnames[] = { 94 __MNT_FLAGS 95 }; 96 97 #define FLG_UPDATE 1 98 #define FLG_RDONLY 2 99 #define FLG_RDWRITE 4 100 #define FLG_FORCE 8 101 102 static const char ffs_fstype[] = "ffs"; 103 104 int 105 main(int argc, char *argv[]) 106 { 107 const char *mntfromname, *mntonname, **vfslist, *vfstype; 108 struct fstab *fs; 109 struct statvfs *mntbuf; 110 #if 0 111 FILE *mountdfp; 112 #endif 113 int all, ch, forceall, i, init_flags, mntsize, rval; 114 char *options; 115 const char *mountopts, *fstypename; 116 char canonical_path_buf[MAXPATHLEN], buf[MAXPATHLEN]; 117 char *canonical_path; 118 119 /* started as "mount" */ 120 all = forceall = init_flags = 0; 121 options = NULL; 122 vfslist = NULL; 123 vfstype = ffs_fstype; 124 while ((ch = getopt(argc, argv, "Aadfo:rwt:uv")) != -1) 125 switch (ch) { 126 case 'A': 127 all = forceall = 1; 128 break; 129 case 'a': 130 all = 1; 131 break; 132 case 'd': 133 debug = 1; 134 break; 135 case 'f': 136 init_flags |= FLG_FORCE; 137 break; 138 case 'o': 139 if (*optarg) 140 catopt(&options, optarg); 141 break; 142 case 'r': 143 init_flags |= FLG_RDONLY; 144 break; 145 case 't': 146 if (vfslist != NULL) 147 errx(EXIT_FAILURE, 148 "Only one -t option may be specified."); 149 vfslist = makevfslist(optarg); 150 vfstype = optarg; 151 break; 152 case 'u': 153 init_flags |= FLG_UPDATE; 154 break; 155 case 'v': 156 verbose++; 157 break; 158 case 'w': 159 init_flags |= FLG_RDWRITE; 160 break; 161 case '?': 162 default: 163 usage(); 164 /* NOTREACHED */ 165 } 166 argc -= optind; 167 argv += optind; 168 169 #define BADTYPE(type) \ 170 (strcmp(type, FSTAB_RO) && \ 171 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 172 173 rval = 0; 174 switch (argc) { 175 case 0: 176 if (all) 177 while ((fs = getfsent()) != NULL) { 178 if (BADTYPE(fs->fs_type)) 179 continue; 180 if (checkvfsname(fs->fs_vfstype, vfslist)) 181 continue; 182 if (hasopt(fs->fs_mntops, "noauto")) 183 continue; 184 if (strcmp(fs->fs_spec, "from_mount") == 0) { 185 if ((mntbuf = getmntpt(fs->fs_file)) 186 == NULL) 187 errx(EXIT_FAILURE, 188 "Unknown file system %s", 189 fs->fs_file); 190 mntfromname = mntbuf->f_mntfromname; 191 } else 192 mntfromname = fs->fs_spec; 193 mntfromname = getfsspecname(buf, sizeof(buf), 194 mntfromname); 195 if (mntfromname == NULL) 196 err(EXIT_FAILURE, "%s", buf); 197 if (mountfs(fs->fs_vfstype, mntfromname, 198 fs->fs_file, init_flags, options, 199 fs->fs_mntops, !forceall, NULL, 0)) 200 rval = 1; 201 } 202 else { 203 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 204 err(EXIT_FAILURE, "getmntinfo"); 205 for (i = 0; i < mntsize; i++) { 206 if (checkvfsname(mntbuf[i].f_fstypename, 207 vfslist)) 208 continue; 209 prmount(&mntbuf[i]); 210 } 211 } 212 return rval; 213 case 1: 214 if (vfslist != NULL) { 215 usage(); 216 /* NOTREACHED */ 217 } 218 219 /* 220 * Create a canonical version of the device or mount path 221 * passed to us. It's ok for this to fail. It's also ok 222 * for the result to be exactly the same as the original. 223 */ 224 canonical_path = realpath(*argv, canonical_path_buf); 225 226 if (init_flags & FLG_UPDATE) { 227 /* 228 * Try looking up the canonical path first, 229 * then try exactly what the user entered. 230 */ 231 if ((canonical_path == NULL || 232 (mntbuf = getmntpt(canonical_path)) == NULL) && 233 (mntbuf = getmntpt(*argv)) == NULL) { 234 out: 235 errx(EXIT_FAILURE, 236 "Unknown special file or file system `%s'", 237 *argv); 238 } 239 mntfromname = mntbuf->f_mntfromname; 240 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 241 if (strcmp(fs->fs_spec, "from_mount") != 0) 242 mntfromname = fs->fs_spec; 243 /* ignore the fstab file options. */ 244 fs->fs_mntops = NULL; 245 } 246 mntonname = mntbuf->f_mntonname; 247 fstypename = mntbuf->f_fstypename; 248 mountopts = NULL; 249 } else { 250 /* 251 * Try looking up the canonical path first, 252 * then try exactly what the user entered. 253 */ 254 if (canonical_path == NULL || 255 ((fs = getfsfile(canonical_path)) == NULL && 256 (fs = getfsspec(canonical_path)) == NULL)) 257 { 258 if ((fs = getfsfile(*argv)) == NULL && 259 (fs = getfsspec(*argv)) == NULL) { 260 goto out; 261 } 262 } 263 if (BADTYPE(fs->fs_type)) 264 errx(EXIT_FAILURE, 265 "Unknown file system type for `%s'", 266 *argv); 267 if (strcmp(fs->fs_spec, "from_mount") == 0) { 268 if ((canonical_path == NULL || 269 (mntbuf = getmntpt(canonical_path)) 270 == NULL) && 271 (mntbuf = getmntpt(*argv)) == NULL) 272 goto out; 273 mntfromname = mntbuf->f_mntfromname; 274 } else 275 mntfromname = fs->fs_spec; 276 mntonname = fs->fs_file; 277 fstypename = fs->fs_vfstype; 278 mountopts = fs->fs_mntops; 279 } 280 mntfromname = getfsspecname(buf, sizeof(buf), mntfromname); 281 if (mntfromname == NULL) 282 err(EXIT_FAILURE, "%s", buf); 283 rval = mountfs(fstypename, mntfromname, 284 mntonname, init_flags, options, mountopts, 0, NULL, 0); 285 break; 286 case 2: 287 /* 288 * If -t flag has not been specified, and spec contains either 289 * a ':' or a '@' then assume that an NFS filesystem is being 290 * specified ala Sun. 291 */ 292 mntfromname = getfsspecname(buf, sizeof(buf), argv[0]); 293 if (mntfromname == NULL) 294 err(EXIT_FAILURE, "%s", buf); 295 if (vfslist == NULL) { 296 if (strpbrk(argv[0], ":@") != NULL) { 297 fprintf(stderr, "WARNING: autoselecting nfs " 298 "based on : or @ in the device name is " 299 "deprecated!\n" 300 "WARNING: This behaviour will be removed " 301 "in a future release\n"); 302 vfstype = "nfs"; 303 } else { 304 vfstype = getfslab(mntfromname); 305 if (vfstype == NULL) 306 vfstype = ffs_fstype; 307 } 308 } 309 rval = mountfs(vfstype, mntfromname, argv[1], init_flags, 310 options, NULL, 0, NULL, 0); 311 break; 312 default: 313 usage(); 314 } 315 316 #if 0 /* disabled because it interferes the service. */ 317 /* 318 * If the mount was successfully, and done by root, tell mountd the 319 * good news. Pid checks are probably unnecessary, but don't hurt. 320 */ 321 if (rval == 0 && getuid() == 0 && 322 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 323 int pid; 324 325 if (fscanf(mountdfp, "%d", &pid) == 1 && 326 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 327 err(EXIT_FAILURE, "signal mountd"); 328 (void)fclose(mountdfp); 329 } 330 #endif 331 332 return rval; 333 } 334 335 int 336 hasopt(const char *mntopts, const char *option) 337 { 338 int negative, found; 339 char *opt, *optbuf; 340 341 if (option[0] == 'n' && option[1] == 'o') { 342 negative = 1; 343 option += 2; 344 } else 345 negative = 0; 346 optbuf = estrdup(mntopts); 347 found = 0; 348 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 349 if (opt[0] == 'n' && opt[1] == 'o') { 350 if (!strcasecmp(opt + 2, option)) 351 found = negative; 352 } else if (!strcasecmp(opt, option)) 353 found = !negative; 354 } 355 free(optbuf); 356 return (found); 357 } 358 359 static int 360 mountfs(const char *vfstype, const char *spec, const char *name, 361 int flags, const char *options, const char *mntopts, 362 int skipmounted, char *buf, size_t buflen) 363 { 364 /* List of directories containing mount_xxx subcommands. */ 365 static const char *edirs[] = { 366 #ifdef RESCUEDIR 367 RESCUEDIR, 368 #endif 369 _PATH_SBIN, 370 _PATH_USRSBIN, 371 NULL 372 }; 373 const char ** volatile argv, **edir; 374 struct statvfs *sfp, sf; 375 pid_t pid; 376 int pfd[2]; 377 int argc, numfs, i, status, maxargc; 378 char *optbuf, execname[MAXPATHLEN + 1], execbase[MAXPATHLEN], 379 mntpath[MAXPATHLEN]; 380 volatile int getargs; 381 382 if (realpath(name, mntpath) == NULL) { 383 warn("realpath `%s'", name); 384 return (1); 385 } 386 387 name = mntpath; 388 389 optbuf = NULL; 390 if (mntopts) 391 catopt(&optbuf, mntopts); 392 393 if (options) { 394 catopt(&optbuf, options); 395 getargs = strstr(options, "getargs") != NULL; 396 } else 397 getargs = 0; 398 399 if (!mntopts && !options) 400 catopt(&optbuf, "rw"); 401 402 if (getargs == 0 && strcmp(name, "/") == 0 && !hasopt(optbuf, "union")) 403 flags |= FLG_UPDATE; 404 else if (skipmounted) { 405 if ((numfs = getmntinfo(&sfp, MNT_WAIT)) == 0) { 406 warn("getmntinfo"); 407 return (1); 408 } 409 for(i = 0; i < numfs; i++) { 410 const char *mountedtype = sfp[i].f_fstypename; 411 size_t cmplen = sizeof(sfp[i].f_fstypename); 412 413 /* remove "puffs|" from comparisons, if present */ 414 #define TYPESIZE (sizeof(PUFFS_TYPEPREFIX)-1) 415 if (strncmp(mountedtype, 416 PUFFS_TYPEPREFIX, TYPESIZE) == 0) { 417 mountedtype += TYPESIZE; 418 cmplen -= TYPESIZE; 419 } 420 421 /* 422 * XXX can't check f_mntfromname, 423 * thanks to mfs, union, etc. 424 */ 425 if (strncmp(name, sfp[i].f_mntonname, MNAMELEN) == 0 && 426 strncmp(vfstype, mountedtype, cmplen) == 0) { 427 if (verbose) 428 (void)printf("%s on %s type %.*s: " 429 "%s\n", 430 sfp[i].f_mntfromname, 431 sfp[i].f_mntonname, 432 (int)sizeof(sfp[i].f_fstypename), 433 sfp[i].f_fstypename, 434 "already mounted"); 435 return (0); 436 } 437 } 438 } 439 if (flags & FLG_FORCE) 440 catopt(&optbuf, "force"); 441 if (flags & FLG_RDONLY) 442 catopt(&optbuf, "ro"); 443 /* make -w override -r */ 444 if (flags & FLG_RDWRITE) 445 catopt(&optbuf, "rw"); 446 447 if (flags & FLG_UPDATE) { 448 catopt(&optbuf, "update"); 449 /* Figure out the fstype only if we defaulted to ffs */ 450 if (vfstype == ffs_fstype && statvfs(name, &sf) != -1) 451 vfstype = sf.f_fstypename; 452 } 453 454 maxargc = 64; 455 argv = ecalloc(maxargc, sizeof(*argv)); 456 457 if (getargs && 458 strncmp(vfstype, PUFFS_TYPEPREFIX, sizeof(PUFFS_TYPEPREFIX)-1) == 0) 459 (void)snprintf(execbase, sizeof(execbase), "mount_puffs"); 460 else if (hasopt(optbuf, "rump")) 461 (void)snprintf(execbase, sizeof(execbase), "rump_%s", vfstype); 462 else 463 (void)snprintf(execbase, sizeof(execbase), "mount_%s", vfstype); 464 argc = 0; 465 argv[argc++] = execbase; 466 if (optbuf) 467 mangle(optbuf, &argc, &argv, &maxargc); 468 argv[argc++] = spec; 469 argv[argc++] = name; 470 argv[argc] = NULL; 471 472 if ((verbose && buf == NULL) || debug) { 473 (void)printf("exec:"); 474 for (i = 0; i < argc; i++) 475 (void)printf(" %s", argv[i]); 476 (void)printf("\n"); 477 } 478 479 if (buf) { 480 if (pipe(pfd) == -1) 481 warn("Cannot create pipe"); 482 } 483 484 switch (pid = fork()) { 485 case -1: /* Error. */ 486 warn("fork"); 487 if (optbuf) 488 free(optbuf); 489 free(argv); 490 return (1); 491 492 case 0: /* Child. */ 493 if (debug) 494 _exit(0); 495 496 if (buf) { 497 (void)close(pfd[0]); 498 (void)close(STDOUT_FILENO); 499 if (dup2(pfd[1], STDOUT_FILENO) == -1) 500 warn("Cannot open fd to mount program"); 501 } 502 503 /* Go find an executable. */ 504 edir = edirs; 505 do { 506 (void)snprintf(execname, 507 sizeof(execname), "%s/%s", *edir, execbase); 508 (void)execv(execname, __UNCONST(argv)); 509 if (errno != ENOENT) 510 warn("exec %s for %s", execname, name); 511 } while (*++edir != NULL); 512 513 if (errno == ENOENT) 514 warn("exec %s for %s: %s", execbase, name, execbase); 515 _exit(1); 516 /* NOTREACHED */ 517 518 default: /* Parent. */ 519 if (optbuf) 520 free(optbuf); 521 free(argv); 522 523 if (buf || getargs) { 524 char tbuf[1024], *ptr; 525 int nread; 526 527 if (buf == NULL) { 528 ptr = tbuf; 529 buflen = sizeof(tbuf) - 1; 530 } else { 531 ptr = buf; 532 buflen--; 533 } 534 (void)close(pfd[1]); 535 (void)signal(SIGPIPE, SIG_IGN); 536 while ((nread = read(pfd[0], ptr, buflen)) > 0) { 537 buflen -= nread; 538 ptr += nread; 539 } 540 *ptr = '\0'; 541 if (buflen == 0) { 542 while (read(pfd[0], &nread, sizeof(nread)) > 0) 543 continue; 544 } 545 if (buf == NULL) 546 (void)fprintf(stdout, "%s", tbuf); 547 } 548 549 if (waitpid(pid, &status, 0) == -1) { 550 warn("waitpid"); 551 return (1); 552 } 553 554 if (WIFEXITED(status)) { 555 if (WEXITSTATUS(status) != 0) 556 return (WEXITSTATUS(status)); 557 } else if (WIFSIGNALED(status)) { 558 warnx("%s: %s", name, strsignal(WTERMSIG(status))); 559 return (1); 560 } 561 562 if (buf == NULL) { 563 if (verbose) { 564 if (statvfs(name, &sf) == -1) { 565 warn("statvfs %s", name); 566 return (1); 567 } 568 prmount(&sf); 569 } 570 } 571 break; 572 } 573 574 return (0); 575 } 576 577 static void 578 prmount(struct statvfs *sfp) 579 { 580 int flags; 581 const struct opt *o; 582 struct passwd *pw; 583 int f; 584 585 (void)printf("%s on %s type %.*s", sfp->f_mntfromname, 586 sfp->f_mntonname, (int)sizeof(sfp->f_fstypename), 587 sfp->f_fstypename); 588 589 flags = sfp->f_flag & MNT_VISFLAGMASK; 590 for (f = 0, o = optnames; flags && o < 591 &optnames[sizeof(optnames)/sizeof(optnames[0])]; o++) 592 if (flags & o->o_opt) { 593 if (!o->o_silent || verbose) 594 (void)printf("%s%s", !f++ ? " (" : ", ", 595 o->o_name); 596 flags &= ~o->o_opt; 597 } 598 if (flags) 599 (void)printf("%sunknown flag%s %#x", !f++ ? " (" : ", ", 600 flags & (flags - 1) ? "s" : "", flags); 601 if (sfp->f_owner) { 602 (void)printf("%smounted by ", !f++ ? " (" : ", "); 603 if ((pw = getpwuid(sfp->f_owner)) != NULL) 604 (void)printf("%s", pw->pw_name); 605 else 606 (void)printf("%d", sfp->f_owner); 607 } 608 if (verbose) 609 (void)printf("%sfsid: 0x%x/0x%x", 610 !f++ ? " (" /* ) */: ", ", 611 sfp->f_fsidx.__fsid_val[0], sfp->f_fsidx.__fsid_val[1]); 612 613 if (verbose) { 614 (void)printf("%s", !f++ ? " (" : ", "); 615 (void)printf("reads: sync %" PRIu64 " async %" PRIu64 "", 616 sfp->f_syncreads, sfp->f_asyncreads); 617 (void)printf(", writes: sync %" PRIu64 " async %" PRIu64 "", 618 sfp->f_syncwrites, sfp->f_asyncwrites); 619 if (verbose > 1) { 620 char buf[2048]; 621 622 if (getmntargs(sfp, buf, sizeof(buf))) 623 printf(", [%s: %s]", sfp->f_fstypename, buf); 624 } 625 printf(")\n"); 626 } else 627 (void)printf("%s", f ? ")\n" : "\n"); 628 } 629 630 static int 631 getmntargs(struct statvfs *sfs, char *buf, size_t buflen) 632 { 633 634 if (mountfs(sfs->f_fstypename, sfs->f_mntfromname, sfs->f_mntonname, 0, 635 "getargs", NULL, 0, buf, buflen)) 636 return (0); 637 else { 638 if (*buf == '\0') 639 return (0); 640 if ((buf = strchr(buf, '\n')) != NULL) 641 *buf = '\0'; 642 return (1); 643 } 644 } 645 646 static struct statvfs * 647 getmntpt(const char *name) 648 { 649 struct statvfs *mntbuf; 650 int i, mntsize; 651 652 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 653 for (i = 0; i < mntsize; i++) 654 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 655 strcmp(mntbuf[i].f_mntonname, name) == 0) 656 return (&mntbuf[i]); 657 return (NULL); 658 } 659 660 static void 661 catopt(char **sp, const char *o) 662 { 663 char *s, *n; 664 665 s = *sp; 666 if (s) { 667 easprintf(&n, "%s,%s", s, o); 668 free(s); 669 s = n; 670 } else 671 s = estrdup(o); 672 *sp = s; 673 } 674 675 static void 676 mangle(char *options, int *argcp, const char ** volatile *argvp, int *maxargcp) 677 { 678 char *p, *s; 679 int argc, maxargc; 680 const char **argv, **nargv; 681 682 argc = *argcp; 683 argv = *argvp; 684 maxargc = *maxargcp; 685 686 for (s = options; (p = strsep(&s, ",")) != NULL;) { 687 /* Always leave space for one more argument and the NULL. */ 688 if (argc >= maxargc - 4) { 689 nargv = erealloc(argv, (maxargc << 1) * sizeof(nargv)); 690 argv = nargv; 691 maxargc <<= 1; 692 } 693 if (*p != '\0') { 694 if (*p == '-') { 695 argv[argc++] = p; 696 p = strchr(p, '='); 697 if (p) { 698 *p = '\0'; 699 argv[argc++] = p+1; 700 } 701 } else { 702 argv[argc++] = "-o"; 703 argv[argc++] = p; 704 } 705 } 706 } 707 708 *argcp = argc; 709 *argvp = argv; 710 *maxargcp = maxargc; 711 } 712 713 /* Deduce the filesystem type from the disk label. */ 714 static const char * 715 getfslab(const char *str) 716 { 717 static struct dkwedge_info dkw; 718 struct disklabel dl; 719 int fd; 720 int part; 721 const char *vfstype; 722 u_char fstype; 723 char buf[MAXPATHLEN + 1]; 724 char *sp, *ep; 725 726 if ((fd = open(str, O_RDONLY)) == -1) { 727 /* 728 * Iff we get EBUSY try the raw device. Since mount always uses 729 * the block device we know we are never passed a raw device. 730 */ 731 if (errno != EBUSY) 732 err(EXIT_FAILURE, "cannot open `%s'", str); 733 strlcpy(buf, str, MAXPATHLEN); 734 if ((sp = strrchr(buf, '/')) != NULL) 735 ++sp; 736 else 737 sp = buf; 738 for (ep = sp + strlen(sp) + 1; ep > sp; ep--) 739 *ep = *(ep - 1); 740 *sp = 'r'; 741 742 /* Silently fail here - mount call can display error */ 743 if ((fd = open(buf, O_RDONLY)) == -1) 744 return (NULL); 745 } 746 747 /* Check to see if this is a wedge. */ 748 if (ioctl(fd, DIOCGWEDGEINFO, &dkw) == 0) { 749 /* Yup, this is easy. */ 750 (void) close(fd); 751 return (dkw.dkw_ptype); 752 } 753 754 if (ioctl(fd, DIOCGDINFO, &dl) == -1) { 755 (void) close(fd); 756 return (NULL); 757 } 758 759 (void) close(fd); 760 761 part = str[strlen(str) - 1] - 'a'; 762 763 if (part < 0 || part >= dl.d_npartitions) 764 return (NULL); 765 766 /* Return NULL for unknown types - caller can fall back to ffs */ 767 if ((fstype = dl.d_partitions[part].p_fstype) >= FSMAXMOUNTNAMES) 768 vfstype = NULL; 769 else 770 vfstype = mountnames[fstype]; 771 772 return (vfstype); 773 } 774 775 static void 776 usage(void) 777 { 778 779 (void)fprintf(stderr, "Usage: %s [-Aadfruvw] [-t type]\n" 780 "\t%s [-dfruvw] special | node\n" 781 "\t%s [-dfruvw] [-o options] [-t type] special node\n", 782 getprogname(), getprogname(), getprogname()); 783 exit(1); 784 } 785
Indexes created Thu Oct 23 22:10:10 GMT 2025