1 /*- 2 * Copyright (c) 1980, 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1980, 1989, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)mount.c 8.25 (Berkeley) 5/8/95"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/mount.h> 50 #include <sys/stat.h> 51 #include <sys/wait.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <fstab.h> 56 #include <pwd.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 #include "extern.h" 64 #include "mntopts.h" 65 #include "pathnames.h" 66 67 /* `meta' options */ 68 #define MOUNT_META_OPTION_FSTAB "fstab" 69 #define MOUNT_META_OPTION_CURRENT "current" 70 71 int debug, fstab_style, verbose; 72 73 char *catopt __P((char *, const char *)); 74 struct statfs 75 *getmntpt __P((const char *)); 76 int hasopt __P((const char *, const char *)); 77 int ismounted __P((struct fstab *, struct statfs *, int)); 78 int isremountable __P((const char *)); 79 void mangle __P((char *, int *, const char **)); 80 char *update_options __P((char *, char *, int)); 81 int mountfs __P((const char *, const char *, const char *, 82 int, const char *, const char *)); 83 void remopt __P((char *, const char *)); 84 void prmount __P((struct statfs *)); 85 void putfsent __P((const struct statfs *)); 86 void usage __P((void)); 87 char *flags2opts __P((int)); 88 89 /* Map from mount options to printable formats. */ 90 static struct opt { 91 int o_opt; 92 const char *o_name; 93 } optnames[] = { 94 { MNT_ASYNC, "asynchronous" }, 95 { MNT_EXPORTED, "NFS exported" }, 96 { MNT_LOCAL, "local" }, 97 { MNT_NOATIME, "noatime" }, 98 { MNT_NODEV, "nodev" }, 99 { MNT_NOEXEC, "noexec" }, 100 { MNT_NOSUID, "nosuid" }, 101 { MNT_NOSYMFOLLOW, "nosymfollow" }, 102 { MNT_QUOTA, "with quotas" }, 103 { MNT_RDONLY, "read-only" }, 104 { MNT_SYNCHRONOUS, "synchronous" }, 105 { MNT_UNION, "union" }, 106 { MNT_NOCLUSTERR, "noclusterr" }, 107 { MNT_NOCLUSTERW, "noclusterw" }, 108 { MNT_SUIDDIR, "suiddir" }, 109 { MNT_SOFTDEP, "soft-updates" }, 110 { 0, NULL } 111 }; 112 113 /* 114 * List of VFS types that can be remounted without becoming mounted on top 115 * of each other. 116 * XXX Is this list correct? 117 */ 118 static const char * 119 remountable_fs_names[] = { 120 "ufs", "ffs", "ext2fs", 121 0 122 }; 123 124 int 125 main(argc, argv) 126 int argc; 127 char * const argv[]; 128 { 129 const char *mntfromname, **vfslist, *vfstype; 130 struct fstab *fs; 131 struct statfs *mntbuf; 132 FILE *mountdfp; 133 pid_t pid; 134 int all, ch, i, init_flags, mntsize, rval, have_fstab; 135 char *options; 136 137 all = init_flags = 0; 138 options = NULL; 139 vfslist = NULL; 140 vfstype = "ufs"; 141 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1) 142 switch (ch) { 143 case 'a': 144 all = 1; 145 break; 146 case 'd': 147 debug = 1; 148 break; 149 case 'f': 150 init_flags |= MNT_FORCE; 151 break; 152 case 'o': 153 if (*optarg) 154 options = catopt(options, optarg); 155 break; 156 case 'p': 157 fstab_style = 1; 158 verbose = 1; 159 break; 160 case 'r': 161 options = catopt(options, "ro"); 162 break; 163 case 't': 164 if (vfslist != NULL) 165 errx(1, "only one -t option may be specified"); 166 vfslist = makevfslist(optarg); 167 vfstype = optarg; 168 break; 169 case 'u': 170 init_flags |= MNT_UPDATE; 171 break; 172 case 'v': 173 verbose = 1; 174 break; 175 case 'w': 176 options = catopt(options, "noro"); 177 break; 178 case '?': 179 default: 180 usage(); 181 /* NOTREACHED */ 182 } 183 argc -= optind; 184 argv += optind; 185 186 #define BADTYPE(type) \ 187 (strcmp(type, FSTAB_RO) && \ 188 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 189 190 rval = 0; 191 switch (argc) { 192 case 0: 193 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 194 err(1, "getmntinfo"); 195 if (all) { 196 while ((fs = getfsent()) != NULL) { 197 if (BADTYPE(fs->fs_type)) 198 continue; 199 if (checkvfsname(fs->fs_vfstype, vfslist)) 200 continue; 201 if (hasopt(fs->fs_mntops, "noauto")) 202 continue; 203 if (!(init_flags & MNT_UPDATE) && 204 ismounted(fs, mntbuf, mntsize)) 205 continue; 206 if (mountfs(fs->fs_vfstype, fs->fs_spec, 207 fs->fs_file, init_flags, options, 208 fs->fs_mntops)) 209 rval = 1; 210 } 211 } else if (fstab_style) { 212 for (i = 0; i < mntsize; i++) { 213 if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) 214 continue; 215 putfsent(&mntbuf[i]); 216 } 217 } else { 218 for (i = 0; i < mntsize; i++) { 219 if (checkvfsname(mntbuf[i].f_fstypename, 220 vfslist)) 221 continue; 222 prmount(&mntbuf[i]); 223 } 224 } 225 exit(rval); 226 case 1: 227 if (vfslist != NULL) 228 usage(); 229 230 if (init_flags & MNT_UPDATE) { 231 mntfromname = NULL; 232 have_fstab = 0; 233 if ((mntbuf = getmntpt(*argv)) == NULL) 234 errx(1, "not currently mounted %s", *argv); 235 /* 236 * Only get the mntflags from fstab if both mntpoint 237 * and mntspec are identical. Also handle the special 238 * case where just '/' is mounted and 'spec' is not 239 * identical with the one from fstab ('/dev' is missing 240 * in the spec-string at boot-time). 241 */ 242 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 243 if (strcmp(fs->fs_spec, 244 mntbuf->f_mntfromname) == 0 && 245 strcmp(fs->fs_file, 246 mntbuf->f_mntonname) == 0) { 247 have_fstab = 1; 248 mntfromname = mntbuf->f_mntfromname; 249 } else if (argv[0][0] == '/' && 250 argv[0][1] == '\0') { 251 fs = getfsfile("/"); 252 have_fstab = 1; 253 mntfromname = fs->fs_spec; 254 } 255 } 256 if (have_fstab) { 257 options = update_options(options, fs->fs_mntops, 258 mntbuf->f_flags); 259 } else { 260 mntfromname = mntbuf->f_mntfromname; 261 options = update_options(options, NULL, 262 mntbuf->f_flags); 263 } 264 rval = mountfs(mntbuf->f_fstypename, mntfromname, 265 mntbuf->f_mntonname, init_flags, options, 0); 266 break; 267 } 268 rmslashes(*argv, *argv); 269 if ((fs = getfsfile(*argv)) == NULL && 270 (fs = getfsspec(*argv)) == NULL) 271 errx(1, "%s: unknown special file or file system", 272 *argv); 273 if (BADTYPE(fs->fs_type)) 274 errx(1, "%s has unknown file system type", 275 *argv); 276 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, 277 init_flags, options, fs->fs_mntops); 278 break; 279 case 2: 280 /* 281 * If -t flag has not been specified, the path cannot be 282 * found, spec contains either a ':' or a '@', and the 283 * spec is not a file with those characters, then assume 284 * that an NFS filesystem is being specified ala Sun. 285 */ 286 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL && 287 access(argv[0], 0) == -1) 288 vfstype = "nfs"; 289 rval = mountfs(vfstype, 290 argv[0], argv[1], init_flags, options, NULL); 291 break; 292 default: 293 usage(); 294 /* NOTREACHED */ 295 } 296 297 /* 298 * If the mount was successfully, and done by root, tell mountd the 299 * good news. Pid checks are probably unnecessary, but don't hurt. 300 */ 301 if (rval == 0 && getuid() == 0 && 302 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 303 if (fscanf(mountdfp, "%d", &pid) == 1 && 304 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 305 err(1, "signal mountd"); 306 (void)fclose(mountdfp); 307 } 308 309 exit(rval); 310 } 311 312 int 313 ismounted(fs, mntbuf, mntsize) 314 struct fstab *fs; 315 struct statfs *mntbuf; 316 int mntsize; 317 { 318 int i; 319 320 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0') 321 /* the root file system can always be remounted */ 322 return (0); 323 324 for (i = mntsize - 1; i >= 0; --i) 325 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 && 326 (!isremountable(fs->fs_vfstype) || 327 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)) 328 return (1); 329 return (0); 330 } 331 332 int 333 isremountable(vfsname) 334 const char *vfsname; 335 { 336 const char **cp; 337 338 for (cp = remountable_fs_names; *cp; cp++) 339 if (strcmp(*cp, vfsname) == 0) 340 return (1); 341 return (0); 342 } 343 344 int 345 hasopt(mntopts, option) 346 const char *mntopts, *option; 347 { 348 int negative, found; 349 char *opt, *optbuf; 350 351 if (option[0] == 'n' && option[1] == 'o') { 352 negative = 1; 353 option += 2; 354 } else 355 negative = 0; 356 optbuf = strdup(mntopts); 357 found = 0; 358 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 359 if (opt[0] == 'n' && opt[1] == 'o') { 360 if (!strcasecmp(opt + 2, option)) 361 found = negative; 362 } else if (!strcasecmp(opt, option)) 363 found = !negative; 364 } 365 free(optbuf); 366 return (found); 367 } 368 369 int 370 mountfs(vfstype, spec, name, flags, options, mntopts) 371 const char *vfstype, *spec, *name, *options, *mntopts; 372 int flags; 373 { 374 /* List of directories containing mount_xxx subcommands. */ 375 static const char *edirs[] = { 376 _PATH_SBIN, 377 _PATH_USRSBIN, 378 NULL 379 }; 380 const char *argv[100], **edir; 381 struct statfs sf; 382 pid_t pid; 383 int argc, i, status; 384 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 385 386 #if __GNUC__ 387 (void)&optbuf; 388 (void)&name; 389 #endif 390 391 /* resolve the mountpoint with realpath(3) */ 392 (void)checkpath(name, mntpath); 393 name = mntpath; 394 395 if (mntopts == NULL) 396 mntopts = ""; 397 if (options == NULL) { 398 if (*mntopts == '\0') { 399 options = "rw"; 400 } else { 401 options = mntopts; 402 mntopts = ""; 403 } 404 } 405 optbuf = catopt(strdup(mntopts), options); 406 407 if (strcmp(name, "/") == 0) 408 flags |= MNT_UPDATE; 409 if (flags & MNT_FORCE) 410 optbuf = catopt(optbuf, "force"); 411 if (flags & MNT_RDONLY) 412 optbuf = catopt(optbuf, "ro"); 413 /* 414 * XXX 415 * The mount_mfs (newfs) command uses -o to select the 416 * optimization mode. We don't pass the default "-o rw" 417 * for that reason. 418 */ 419 if (flags & MNT_UPDATE) 420 optbuf = catopt(optbuf, "update"); 421 422 argc = 0; 423 argv[argc++] = vfstype; 424 mangle(optbuf, &argc, argv); 425 argv[argc++] = spec; 426 argv[argc++] = name; 427 argv[argc] = NULL; 428 429 if (debug) { 430 (void)printf("exec: mount_%s", vfstype); 431 for (i = 1; i < argc; i++) 432 (void)printf(" %s", argv[i]); 433 (void)printf("\n"); 434 return (0); 435 } 436 437 switch (pid = fork()) { 438 case -1: /* Error. */ 439 warn("fork"); 440 free(optbuf); 441 return (1); 442 case 0: /* Child. */ 443 if (strcmp(vfstype, "ufs") == 0) 444 exit(mount_ufs(argc, (char * const *) argv)); 445 446 /* Go find an executable. */ 447 for (edir = edirs; *edir; edir++) { 448 (void)snprintf(execname, 449 sizeof(execname), "%s/mount_%s", *edir, vfstype); 450 execv(execname, (char * const *)argv); 451 } 452 if (errno == ENOENT) { 453 int len = 0; 454 char *cp; 455 for (edir = edirs; *edir; edir++) 456 len += strlen(*edir) + 2; /* ", " */ 457 if ((cp = malloc(len)) == NULL) 458 errx(1, "malloc failed"); 459 cp[0] = '\0'; 460 for (edir = edirs; *edir; edir++) { 461 strcat(cp, *edir); 462 if (edir[1] != NULL) 463 strcat(cp, ", "); 464 } 465 warn("exec mount_%s not found in %s", vfstype, cp); 466 } 467 exit(1); 468 /* NOTREACHED */ 469 default: /* Parent. */ 470 free(optbuf); 471 472 if (waitpid(pid, &status, 0) < 0) { 473 warn("waitpid"); 474 return (1); 475 } 476 477 if (WIFEXITED(status)) { 478 if (WEXITSTATUS(status) != 0) 479 return (WEXITSTATUS(status)); 480 } else if (WIFSIGNALED(status)) { 481 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]); 482 return (1); 483 } 484 485 if (verbose) { 486 if (statfs(name, &sf) < 0) { 487 warn("statfs %s", name); 488 return (1); 489 } 490 if (fstab_style) 491 putfsent(&sf); 492 else 493 prmount(&sf); 494 } 495 break; 496 } 497 498 return (0); 499 } 500 501 void 502 prmount(sfp) 503 struct statfs *sfp; 504 { 505 int flags; 506 struct opt *o; 507 struct passwd *pw; 508 509 (void)printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname, 510 sfp->f_fstypename); 511 512 flags = sfp->f_flags & MNT_VISFLAGMASK; 513 for (o = optnames; flags && o->o_opt; o++) 514 if (flags & o->o_opt) { 515 (void)printf(", %s", o->o_name); 516 flags &= ~o->o_opt; 517 } 518 if (sfp->f_owner) { 519 (void)printf(", mounted by "); 520 if ((pw = getpwuid(sfp->f_owner)) != NULL) 521 (void)printf("%s", pw->pw_name); 522 else 523 (void)printf("%d", sfp->f_owner); 524 } 525 if (verbose) { 526 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0) 527 (void)printf(", writes: sync %ld async %ld", 528 sfp->f_syncwrites, sfp->f_asyncwrites); 529 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0) 530 (void)printf(", reads: sync %ld async %ld", 531 sfp->f_syncreads, sfp->f_asyncreads); 532 } 533 (void)printf(")\n"); 534 } 535 536 struct statfs * 537 getmntpt(name) 538 const char *name; 539 { 540 struct statfs *mntbuf; 541 int i, mntsize; 542 543 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 544 for (i = mntsize - 1; i >= 0; i--) { 545 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 546 strcmp(mntbuf[i].f_mntonname, name) == 0) 547 return (&mntbuf[i]); 548 } 549 return (NULL); 550 } 551 552 char * 553 catopt(s0, s1) 554 char *s0; 555 const char *s1; 556 { 557 size_t i; 558 char *cp; 559 560 if (s1 == NULL || *s1 == '\0') 561 return s0; 562 563 if (s0 && *s0) { 564 i = strlen(s0) + strlen(s1) + 1 + 1; 565 if ((cp = malloc(i)) == NULL) 566 errx(1, "malloc failed"); 567 (void)snprintf(cp, i, "%s,%s", s0, s1); 568 } else 569 cp = strdup(s1); 570 571 if (s0) 572 free(s0); 573 return (cp); 574 } 575 576 void 577 mangle(options, argcp, argv) 578 char *options; 579 int *argcp; 580 const char **argv; 581 { 582 char *p, *s; 583 int argc; 584 585 argc = *argcp; 586 for (s = options; (p = strsep(&s, ",")) != NULL;) 587 if (*p != '\0') { 588 if (*p == '-') { 589 argv[argc++] = p; 590 p = strchr(p, '='); 591 if (p) { 592 *p = '\0'; 593 argv[argc++] = p+1; 594 } 595 } else if (strcmp(p, "rw") != 0) { 596 argv[argc++] = "-o"; 597 argv[argc++] = p; 598 } 599 } 600 601 *argcp = argc; 602 } 603 604 605 char * 606 update_options(opts, fstab, curflags) 607 char *opts; 608 char *fstab; 609 int curflags; 610 { 611 char *o, *p; 612 char *cur; 613 char *expopt, *newopt, *tmpopt; 614 615 if (opts == NULL) 616 return strdup(""); 617 618 /* remove meta options from list */ 619 remopt(fstab, MOUNT_META_OPTION_FSTAB); 620 remopt(fstab, MOUNT_META_OPTION_CURRENT); 621 cur = flags2opts(curflags); 622 623 /* 624 * Expand all meta-options passed to us first. 625 */ 626 expopt = NULL; 627 for (p = opts; (o = strsep(&p, ",")) != NULL;) { 628 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0) 629 expopt = catopt(expopt, fstab); 630 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0) 631 expopt = catopt(expopt, cur); 632 else 633 expopt = catopt(expopt, o); 634 } 635 free(cur); 636 free(opts); 637 638 /* 639 * Remove previous contradictory arguments. Given option "foo" we 640 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo" 641 * and "foo" - so we can deal with possible options like "notice". 642 */ 643 newopt = NULL; 644 for (p = expopt; (o = strsep(&p, ",")) != NULL;) { 645 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL) 646 errx(1, "malloc failed"); 647 648 strcpy(tmpopt, "no"); 649 strcat(tmpopt, o); 650 remopt(newopt, tmpopt); 651 free(tmpopt); 652 653 if (strncmp("no", o, 2) == 0) 654 remopt(newopt, o+2); 655 656 newopt = catopt(newopt, o); 657 } 658 free(expopt); 659 660 return newopt; 661 } 662 663 void 664 remopt(string, opt) 665 char *string; 666 const char *opt; 667 { 668 char *o, *p, *r; 669 670 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0') 671 return; 672 673 r = string; 674 675 for (p = string; (o = strsep(&p, ",")) != NULL;) { 676 if (strcmp(opt, o) != 0) { 677 if (*r == ',' && *o != '\0') 678 r++; 679 while ((*r++ = *o++) != '\0') 680 ; 681 *--r = ','; 682 } 683 } 684 *r = '\0'; 685 } 686 687 void 688 usage() 689 { 690 691 (void)fprintf(stderr, "%s\n%s\n%s\n", 692 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node", 693 " mount [-adfpruvw] [-t ufs | external_type]", 694 " mount [-dfpruvw] special | node"); 695 exit(1); 696 } 697 698 void 699 putfsent(ent) 700 const struct statfs *ent; 701 { 702 struct fstab *fst; 703 char *opts; 704 705 opts = flags2opts(ent->f_flags); 706 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname, 707 ent->f_fstypename, opts); 708 free(opts); 709 710 if ((fst = getfsspec(ent->f_mntfromname))) 711 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 712 else if ((fst = getfsfile(ent->f_mntonname))) 713 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 714 else if (strcmp(ent->f_fstypename, "ufs") == 0) { 715 if (strcmp(ent->f_mntonname, "/") == 0) 716 printf("\t1 1\n"); 717 else 718 printf("\t2 2\n"); 719 } else 720 printf("\t0 0\n"); 721 } 722 723 724 char * 725 flags2opts(flags) 726 int flags; 727 { 728 char *res; 729 730 res = NULL; 731 732 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw"); 733 734 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync"); 735 if (flags & MNT_NOEXEC) res = catopt(res, "noexec"); 736 if (flags & MNT_NOSUID) res = catopt(res, "nosuid"); 737 if (flags & MNT_NODEV) res = catopt(res, "nodev"); 738 if (flags & MNT_UNION) res = catopt(res, "union"); 739 if (flags & MNT_ASYNC) res = catopt(res, "async"); 740 if (flags & MNT_NOATIME) res = catopt(res, "noatime"); 741 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr"); 742 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw"); 743 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow"); 744 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir"); 745 746 return res; 747 } 748