sbin/fsck_ffs/main.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1993
   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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if 0
  31 #ifndef lint
  32 static const char copyright[] =
  33 "@(#) Copyright (c) 1980, 1986, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/14/95";
  39 #endif /* not lint */
  40 #endif
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 #include <sys/param.h>
  45 #include <sys/file.h>
  46 #include <sys/mount.h>
  47 #include <sys/resource.h>
  48 #include <sys/stat.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/uio.h>
  51 #include <sys/disklabel.h>
  52
  53 #include <ufs/ufs/dinode.h>
  54 #include <ufs/ffs/fs.h>
  55
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <fstab.h>
  59 #include <grp.h>
  60 #include <inttypes.h>
  61 #include <mntopts.h>
  62 #include <paths.h>
  63 #include <stdint.h>
  64 #include <string.h>
  65 #include <time.h>
  66
  67 #include "fsck.h"
  68
  69 int     restarts;
  70
  71 static void usage(void) __dead2;
  72 static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
  73 static int checkfilesys(char *filesys);
  74 static int chkdoreload(struct statfs *mntp);
  75 static struct statfs *getmntpt(const char *);
  76
  77 int
  78 main(int argc, char *argv[])
  79 {
  80         int ch;
  81         struct rlimit rlimit;
  82         struct itimerval itimerval;
  83         int ret = 0;
  84
  85         sync();
  86         skipclean = 1;
  87         inoopt = 0;
  88         while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZ")) != -1) {
  89                 switch (ch) {
  90                 case 'b':
  91                         skipclean = 0;
  92                         bflag = argtoimax('b', "number", optarg, 10);
  93                         printf("Alternate super block location: %jd\n", bflag);
  94                         break;
  95
  96                 case 'B':
  97                         bkgrdflag = 1;
  98                         break;
  99
 100                 case 'c':
 101                         skipclean = 0;
 102                         cvtlevel = argtoimax('c', "conversion level", optarg,
 103                             10);
 104                         if (cvtlevel < 3)
 105                                 errx(EEXIT, "cannot do level %d conversion",
 106                                     cvtlevel);
 107                         break;
 108
 109                 case 'd':
 110                         debug++;
 111                         break;
 112
 113                 case 'E':
 114                         Eflag++;
 115                         break;
 116
 117                 case 'f':
 118                         skipclean = 0;
 119                         break;
 120
 121                 case 'F':
 122                         bkgrdcheck = 1;
 123                         break;
 124
 125                 case 'm':
 126                         lfmode = argtoimax('m', "mode", optarg, 8);
 127                         if (lfmode &~ 07777)
 128                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 129                         printf("** lost+found creation mode %o\n", lfmode);
 130                         break;
 131
 132                 case 'n':
 133                         nflag++;
 134                         yflag = 0;
 135                         break;
 136
 137                 case 'p':
 138                         preen++;
 139                         /*FALLTHROUGH*/
 140
 141                 case 'C':
 142                         ckclean++;
 143                         break;
 144
 145                 case 'R':
 146                         wantrestart = 1;
 147                         break;
 148                 case 'r':
 149                         inoopt++;
 150                         break;
 151
 152                 case 'S':
 153                         surrender = 1;
 154                         break;
 155
 156                 case 'y':
 157                         yflag++;
 158                         nflag = 0;
 159                         break;
 160
 161                 case 'Z':
 162                         Zflag++;
 163                         break;
 164
 165                 default:
 166                         usage();
 167                 }
 168         }
 169         argc -= optind;
 170         argv += optind;
 171
 172         if (!argc)
 173                 usage();
 174
 175         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 176                 (void)signal(SIGINT, catch);
 177         if (ckclean)
 178                 (void)signal(SIGQUIT, catchquit);
 179         signal(SIGINFO, infohandler);
 180         if (bkgrdflag) {
 181                 signal(SIGALRM, alarmhandler);
 182                 itimerval.it_interval.tv_sec = 5;
 183                 itimerval.it_interval.tv_usec = 0;
 184                 itimerval.it_value.tv_sec = 5;
 185                 itimerval.it_value.tv_usec = 0;
 186                 setitimer(ITIMER_REAL, &itimerval, NULL);
 187         }
 188         /*
 189          * Push up our allowed memory limit so we can cope
 190          * with huge file systems.
 191          */
 192         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 193                 rlimit.rlim_cur = rlimit.rlim_max;
 194                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 195         }
 196         while (argc > 0) {
 197                 if (checkfilesys(*argv) == ERESTART)
 198                         continue;
 199                 argc--;
 200                 argv++;
 201         }
 202
 203         if (returntosingle)
 204                 ret = 2;
 205         exit(ret);
 206 }
 207
 208 static intmax_t
 209 argtoimax(int flag, const char *req, const char *str, int base)
 210 {
 211         char *cp;
 212         intmax_t ret;
 213
 214         ret = strtoimax(str, &cp, base);
 215         if (cp == str || *cp)
 216                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 217         return (ret);
 218 }
 219
 220 /*
 221  * Check the specified file system.
 222  */
 223 /* ARGSUSED */
 224 static int
 225 checkfilesys(char *filesys)
 226 {
 227         ufs2_daddr_t n_ffree, n_bfree;
 228         struct dups *dp;
 229         struct statfs *mntp;
 230         struct stat snapdir;
 231         struct group *grp;
 232         struct iovec *iov;
 233         char errmsg[255];
 234         int ofsmodified;
 235         int iovlen;
 236         int cylno;
 237         intmax_t blks, files;
 238         size_t size;
 239
 240         iov = NULL;
 241         iovlen = 0;
 242         errmsg[0] = '\0';
 243         fsutilinit();
 244         fsckinit();
 245
 246         cdevname = filesys;
 247         if (debug && ckclean)
 248                 pwarn("starting\n");
 249         /*
 250          * Make best effort to get the disk name. Check first to see
 251          * if it is listed among the mounted file systems. Failing that
 252          * check to see if it is listed in /etc/fstab.
 253          */
 254         mntp = getmntpt(filesys);
 255         if (mntp != NULL)
 256                 filesys = mntp->f_mntfromname;
 257         else
 258                 filesys = blockcheck(filesys);
 259         /*
 260          * If -F flag specified, check to see whether a background check
 261          * is possible and needed. If possible and needed, exit with
 262          * status zero. Otherwise exit with status non-zero. A non-zero
 263          * exit status will cause a foreground check to be run.
 264          */
 265         sblock_init();
 266         if (bkgrdcheck) {
 267                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 268                         exit(3);        /* Cannot read superblock */
 269                 close(fsreadfd);
 270                 /* Earlier background failed or journaled */
 271                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 272                         exit(4);
 273                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 274                         exit(5);        /* Not running soft updates */
 275                 size = MIBSIZE;
 276                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 277                         exit(6);        /* Lacks kernel support */
 278                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 279                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 280                         exit(7);        /* Filesystem clean, report it now */
 281                 exit(0);
 282         }
 283         if (ckclean && skipclean) {
 284                 /*
 285                  * If file system is gjournaled, check it here.
 286                  */
 287                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 288                         exit(3);        /* Cannot read superblock */
 289                 close(fsreadfd);
 290                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 291                         //printf("GJournaled file system detected on %s.\n",
 292                         //    filesys);
 293                         if (sblock.fs_clean == 1) {
 294                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 295                                 exit(0);
 296                         }
 297                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 298                                 gjournal_check(filesys);
 299                                 if (chkdoreload(mntp) == 0)
 300                                         exit(0);
 301                                 exit(4);
 302                         } else {
 303                                 pfatal(
 304                             "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
 305                         }
 306                 }
 307         }
 308         /*
 309          * If we are to do a background check:
 310          *      Get the mount point information of the file system
 311          *      create snapshot file
 312          *      return created snapshot file
 313          *      if not found, clear bkgrdflag and proceed with normal fsck
 314          */
 315         if (bkgrdflag) {
 316                 if (mntp == NULL) {
 317                         bkgrdflag = 0;
 318                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 319                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 320                         bkgrdflag = 0;
 321                         pfatal(
 322                           "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
 323                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 324                         bkgrdflag = 0;
 325                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 326                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 327                         if (readsb(0) != 0) {
 328                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 329                                         bkgrdflag = 0;
 330                                         pfatal(
 331                         "UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
 332                                 }
 333                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 334                                     skipclean && ckclean) {
 335                                         /*
 336                                          * file system is clean;
 337                                          * skip snapshot and report it clean
 338                                          */
 339                                         pwarn(
 340                                         "FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 341                                         goto clean;
 342                                 }
 343                         }
 344                         close(fsreadfd);
 345                 }
 346                 if (bkgrdflag) {
 347                         snprintf(snapname, sizeof snapname, "%s/.snap",
 348                             mntp->f_mntonname);
 349                         if (stat(snapname, &snapdir) < 0) {
 350                                 if (errno != ENOENT) {
 351                                         bkgrdflag = 0;
 352                                         pfatal(
 353         "CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 354                                             snapname, strerror(errno));
 355                                 } else if ((grp = getgrnam("operator")) == 0 ||
 356                                     mkdir(snapname, 0770) < 0 ||
 357                                     chown(snapname, -1, grp->gr_gid) < 0 ||
 358                                     chmod(snapname, 0770) < 0) {
 359                                         bkgrdflag = 0;
 360                                         pfatal(
 361         "CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 362                                             snapname, strerror(errno));
 363                                 }
 364                         } else if (!S_ISDIR(snapdir.st_mode)) {
 365                                 bkgrdflag = 0;
 366                                 pfatal(
 367                         "%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
 368                                     snapname);
 369                         }
 370                 }
 371                 if (bkgrdflag) {
 372                         snprintf(snapname, sizeof snapname,
 373                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 374                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 375                         build_iovec(&iov, &iovlen, "from", snapname,
 376                             (size_t)-1);
 377                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 378                             (size_t)-1);
 379                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 380                             sizeof(errmsg));
 381                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 382                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 383
 384                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 385                                 if (errno == EEXIST && unlink(snapname) == 0)
 386                                         continue;
 387                                 bkgrdflag = 0;
 388                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 389                                     snapname, strerror(errno), errmsg);
 390                                 break;
 391                         }
 392                         if (bkgrdflag != 0)
 393                                 filesys = snapname;
 394                 }
 395         }
 396
 397         switch (setup(filesys)) {
 398         case 0:
 399                 if (preen)
 400                         pfatal("CAN'T CHECK FILE SYSTEM.");
 401                 return (0);
 402         case -1:
 403         clean:
 404                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 405                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 406                 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
 407                     (intmax_t)sblock.fs_cstotal.cs_nffree,
 408                     (intmax_t)sblock.fs_cstotal.cs_nbfree,
 409                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 410                 return (0);
 411         }
 412         /*
 413          * Determine if we can and should do journal recovery.
 414          */
 415         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 416                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 417                         if (preen || reply("USE JOURNAL")) {
 418                                 if (suj_check(filesys) == 0) {
 419                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 420                                         if (chkdoreload(mntp) == 0)
 421                                                 exit(0);
 422                                         exit(4);
 423                                 }
 424                         }
 425                         printf("** Skipping journal, falling through to full fsck\n\n");
 426                 }
 427                 /*
 428                  * Write the superblock so we don't try to recover the
 429                  * journal on another pass. If this is the only change
 430                  * to the filesystem, we do not want it to be called
 431                  * out as modified.
 432                  */
 433                 sblock.fs_mtime = time(NULL);
 434                 sbdirty();
 435                 ofsmodified = fsmodified;
 436                 flush(fswritefd, &sblk);
 437                 fsmodified = ofsmodified;
 438         }
 439
 440         /*
 441          * Cleared if any questions answered no. Used to decide if
 442          * the superblock should be marked clean.
 443          */
 444         resolved = 1;
 445         /*
 446          * 1: scan inodes tallying blocks used
 447          */
 448         if (preen == 0) {
 449                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 450                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 451                         printf("** Root file system\n");
 452                 printf("** Phase 1 - Check Blocks and Sizes\n");
 453         }
 454         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 455         pass1();
 456         IOstats("Pass1");
 457
 458         /*
 459          * 1b: locate first references to duplicates, if any
 460          */
 461         if (duplist) {
 462                 if (preen || usedsoftdep)
 463                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 464                             preen ? "-p" : "",
 465                             (preen && usedsoftdep) ? " and " : "",
 466                             usedsoftdep ? "softupdates" : "");
 467                 printf("** Phase 1b - Rescan For More DUPS\n");
 468                 pass1b();
 469                 IOstats("Pass1b");
 470         }
 471
 472         /*
 473          * 2: traverse directories from root to mark all connected directories
 474          */
 475         if (preen == 0)
 476                 printf("** Phase 2 - Check Pathnames\n");
 477         pass2();
 478         IOstats("Pass2");
 479
 480         /*
 481          * 3: scan inodes looking for disconnected directories
 482          */
 483         if (preen == 0)
 484                 printf("** Phase 3 - Check Connectivity\n");
 485         pass3();
 486         IOstats("Pass3");
 487
 488         /*
 489          * 4: scan inodes looking for disconnected files; check reference counts
 490          */
 491         if (preen == 0)
 492                 printf("** Phase 4 - Check Reference Counts\n");
 493         pass4();
 494         IOstats("Pass4");
 495
 496         /*
 497          * 5: check and repair resource counts in cylinder groups
 498          */
 499         if (preen == 0)
 500                 printf("** Phase 5 - Check Cyl groups\n");
 501         pass5();
 502         IOstats("Pass5");
 503
 504         /*
 505          * print out summary statistics
 506          */
 507         n_ffree = sblock.fs_cstotal.cs_nffree;
 508         n_bfree = sblock.fs_cstotal.cs_nbfree;
 509         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 510         blks = n_blks +
 511             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 512         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 513         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 514         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 515         if (bkgrdflag && (files > 0 || blks > 0)) {
 516                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 517                 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
 518                     countdirs, files - countdirs, blks);
 519         }
 520         pwarn("%ld files, %jd used, %ju free ",
 521             (long)n_files, (intmax_t)n_blks,
 522             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 523         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 524             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 525             n_ffree * 100.0 / sblock.fs_dsize);
 526         if (debug) {
 527                 if (files < 0)
 528                         printf("%jd inodes missing\n", -files);
 529                 if (blks < 0)
 530                         printf("%jd blocks missing\n", -blks);
 531                 if (duplist != NULL) {
 532                         printf("The following duplicate blocks remain:");
 533                         for (dp = duplist; dp; dp = dp->next)
 534                                 printf(" %jd,", (intmax_t)dp->dup);
 535                         printf("\n");
 536                 }
 537         }
 538         duplist = (struct dups *)0;
 539         muldup = (struct dups *)0;
 540         inocleanup();
 541         if (fsmodified) {
 542                 sblock.fs_time = time(NULL);
 543                 sbdirty();
 544         }
 545         if (cvtlevel && sblk.b_dirty) {
 546                 /*
 547                  * Write out the duplicate super blocks
 548                  */
 549                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 550                         blwrite(fswritefd, (char *)&sblock,
 551                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 552                             SBLOCKSIZE);
 553         }
 554         if (rerun)
 555                 resolved = 0;
 556         finalIOstats();
 557
 558         /*
 559          * Check to see if the file system is mounted read-write.
 560          */
 561         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 562                 resolved = 0;
 563         ckfini(resolved);
 564
 565         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 566                 if (inostathead[cylno].il_stat != NULL)
 567                         free((char *)inostathead[cylno].il_stat);
 568         free((char *)inostathead);
 569         inostathead = NULL;
 570         if (fsmodified && !preen)
 571                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 572         if (rerun) {
 573                 if (wantrestart && (restarts++ < 10) &&
 574                     (preen || reply("RESTART")))
 575                         return (ERESTART);
 576                 printf("\n***** PLEASE RERUN FSCK *****\n");
 577         }
 578         if (chkdoreload(mntp) != 0) {
 579                 if (!fsmodified)
 580                         return (0);
 581                 if (!preen)
 582                         printf("\n***** REBOOT NOW *****\n");
 583                 sync();
 584                 return (4);
 585         }
 586         return (0);
 587 }
 588
 589 static int
 590 chkdoreload(struct statfs *mntp)
 591 {
 592         struct iovec *iov;
 593         int iovlen;
 594         char errmsg[255];
 595
 596         if (mntp == NULL)
 597                 return (0);
 598
 599         iov = NULL;
 600         iovlen = 0;
 601         errmsg[0] = '\0';
 602         /*
 603          * We modified a mounted file system.  Do a mount update on
 604          * it unless it is read-write, so we can continue using it
 605          * as safely as possible.
 606          */
 607         if (mntp->f_flags & MNT_RDONLY) {
 608                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 609                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 610                     (size_t)-1);
 611                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 612                     (size_t)-1);
 613                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 614                     sizeof(errmsg));
 615                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 616                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 617                 /*
 618                  * XX: We need the following line until we clean up
 619                  * nmount parsing of root mounts and NFS root mounts.
 620                  */
 621                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 622                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 623                         return (0);
 624                 }
 625                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 626                     mntp->f_mntonname, strerror(errno), errmsg);
 627                 return (1);
 628         }
 629         return (0);
 630 }
 631
 632 /*
 633  * Get the mount point information for name.
 634  */
 635 static struct statfs *
 636 getmntpt(const char *name)
 637 {
 638         struct stat devstat, mntdevstat;
 639         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 640         char *ddevname;
 641         struct statfs *mntbuf, *statfsp;
 642         int i, mntsize, isdev;
 643
 644         if (stat(name, &devstat) != 0)
 645                 return (NULL);
 646         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 647                 isdev = 1;
 648         else
 649                 isdev = 0;
 650         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 651         for (i = 0; i < mntsize; i++) {
 652                 statfsp = &mntbuf[i];
 653                 ddevname = statfsp->f_mntfromname;
 654                 if (*ddevname != '/') {
 655                         if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
 656                             sizeof(statfsp->f_mntfromname))
 657                                 continue;
 658                         strcpy(device, _PATH_DEV);
 659                         strcat(device, ddevname);
 660                         strcpy(statfsp->f_mntfromname, device);
 661                 }
 662                 if (isdev == 0) {
 663                         if (strcmp(name, statfsp->f_mntonname))
 664                                 continue;
 665                         return (statfsp);
 666                 }
 667                 if (stat(ddevname, &mntdevstat) == 0 &&
 668                     mntdevstat.st_rdev == devstat.st_rdev)
 669                         return (statfsp);
 670         }
 671         statfsp = NULL;
 672         return (statfsp);
 673 }
 674
 675 static void
 676 usage(void)
 677 {
 678         (void) fprintf(stderr,
 679 "usage: %s [-BEFfnpry] [-b block] [-c level] [-m mode] filesystem ...\n",
 680             getprogname());
 681         exit(1);
 682 }
 683
 684 void
 685 infohandler(int sig __unused)
 686 {
 687         got_siginfo = 1;
 688 }
 689
 690 void
 691 alarmhandler(int sig __unused)
 692 {
 693         got_sigalarm = 1;
 694 }