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 fsret;
  84         int ret = 0;
  85
  86         sync();
  87         skipclean = 1;
  88         inoopt = 0;
  89         while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) {
  90                 switch (ch) {
  91                 case 'b':
  92                         skipclean = 0;
  93                         bflag = argtoimax('b', "number", optarg, 10);
  94                         printf("Alternate super block location: %jd\n", bflag);
  95                         break;
  96
  97                 case 'B':
  98                         bkgrdflag = 1;
  99                         break;
 100
 101                 case 'c':
 102                         skipclean = 0;
 103                         cvtlevel = argtoimax('c', "conversion level", optarg,
 104                             10);
 105                         if (cvtlevel < 3)
 106                                 errx(EEXIT, "cannot do level %d conversion",
 107                                     cvtlevel);
 108                         break;
 109
 110                 case 'd':
 111                         debug++;
 112                         break;
 113
 114                 case 'E':
 115                         Eflag++;
 116                         break;
 117
 118                 case 'f':
 119                         skipclean = 0;
 120                         break;
 121
 122                 case 'F':
 123                         bkgrdcheck = 1;
 124                         break;
 125
 126                 case 'm':
 127                         lfmode = argtoimax('m', "mode", optarg, 8);
 128                         if (lfmode &~ 07777)
 129                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 130                         printf("** lost+found creation mode %o\n", lfmode);
 131                         break;
 132
 133                 case 'n':
 134                         nflag++;
 135                         yflag = 0;
 136                         break;
 137
 138                 case 'p':
 139                         preen++;
 140                         /*FALLTHROUGH*/
 141
 142                 case 'C':
 143                         ckclean++;
 144                         break;
 145
 146                 case 'R':
 147                         wantrestart = 1;
 148                         break;
 149                 case 'r':
 150                         inoopt++;
 151                         break;
 152
 153                 case 'S':
 154                         surrender = 1;
 155                         break;
 156
 157                 case 'y':
 158                         yflag++;
 159                         nflag = 0;
 160                         break;
 161
 162                 case 'Z':
 163                         Zflag++;
 164                         break;
 165
 166                 case 'z':
 167                         zflag++;
 168                         break;
 169
 170                 default:
 171                         usage();
 172                 }
 173         }
 174         argc -= optind;
 175         argv += optind;
 176
 177         if (!argc)
 178                 usage();
 179
 180         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 181                 (void)signal(SIGINT, catch);
 182         if (ckclean)
 183                 (void)signal(SIGQUIT, catchquit);
 184         signal(SIGINFO, infohandler);
 185         if (bkgrdflag) {
 186                 signal(SIGALRM, alarmhandler);
 187                 itimerval.it_interval.tv_sec = 5;
 188                 itimerval.it_interval.tv_usec = 0;
 189                 itimerval.it_value.tv_sec = 5;
 190                 itimerval.it_value.tv_usec = 0;
 191                 setitimer(ITIMER_REAL, &itimerval, NULL);
 192         }
 193         /*
 194          * Push up our allowed memory limit so we can cope
 195          * with huge file systems.
 196          */
 197         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 198                 rlimit.rlim_cur = rlimit.rlim_max;
 199                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 200         }
 201         while (argc > 0) {
 202                 if ((fsret = checkfilesys(*argv)) == ERESTART)
 203                         continue;
 204                 ret |= fsret;
 205                 argc--;
 206                 argv++;
 207         }
 208
 209         if (returntosingle)
 210                 ret = 2;
 211         exit(ret);
 212 }
 213
 214 static intmax_t
 215 argtoimax(int flag, const char *req, const char *str, int base)
 216 {
 217         char *cp;
 218         intmax_t ret;
 219
 220         ret = strtoimax(str, &cp, base);
 221         if (cp == str || *cp)
 222                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 223         return (ret);
 224 }
 225
 226 /*
 227  * Check the specified file system.
 228  */
 229 /* ARGSUSED */
 230 static int
 231 checkfilesys(char *filesys)
 232 {
 233         ufs2_daddr_t n_ffree, n_bfree;
 234         struct dups *dp;
 235         struct statfs *mntp;
 236         struct stat snapdir;
 237         struct group *grp;
 238         struct iovec *iov;
 239         char errmsg[255];
 240         int ofsmodified;
 241         int iovlen;
 242         int cylno;
 243         intmax_t blks, files;
 244         size_t size;
 245
 246         iov = NULL;
 247         iovlen = 0;
 248         errmsg[0] = '\0';
 249         fsutilinit();
 250         fsckinit();
 251
 252         cdevname = filesys;
 253         if (debug && ckclean)
 254                 pwarn("starting\n");
 255         /*
 256          * Make best effort to get the disk name. Check first to see
 257          * if it is listed among the mounted file systems. Failing that
 258          * check to see if it is listed in /etc/fstab.
 259          */
 260         mntp = getmntpt(filesys);
 261         if (mntp != NULL)
 262                 filesys = mntp->f_mntfromname;
 263         else
 264                 filesys = blockcheck(filesys);
 265         /*
 266          * If -F flag specified, check to see whether a background check
 267          * is possible and needed. If possible and needed, exit with
 268          * status zero. Otherwise exit with status non-zero. A non-zero
 269          * exit status will cause a foreground check to be run.
 270          */
 271         sblock_init();
 272         if (bkgrdcheck) {
 273                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 274                         exit(3);        /* Cannot read superblock */
 275                 close(fsreadfd);
 276                 /* Earlier background failed or journaled */
 277                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 278                         exit(4);
 279                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 280                         exit(5);        /* Not running soft updates */
 281                 size = MIBSIZE;
 282                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 283                         exit(6);        /* Lacks kernel support */
 284                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 285                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 286                         exit(7);        /* Filesystem clean, report it now */
 287                 exit(0);
 288         }
 289         if (ckclean && skipclean) {
 290                 /*
 291                  * If file system is gjournaled, check it here.
 292                  */
 293                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 294                         exit(3);        /* Cannot read superblock */
 295                 close(fsreadfd);
 296                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 297                         //printf("GJournaled file system detected on %s.\n",
 298                         //    filesys);
 299                         if (sblock.fs_clean == 1) {
 300                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 301                                 exit(0);
 302                         }
 303                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 304                                 gjournal_check(filesys);
 305                                 if (chkdoreload(mntp) == 0)
 306                                         exit(0);
 307                                 exit(4);
 308                         } else {
 309                                 pfatal(
 310                             "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
 311                         }
 312                 }
 313         }
 314         /*
 315          * If we are to do a background check:
 316          *      Get the mount point information of the file system
 317          *      create snapshot file
 318          *      return created snapshot file
 319          *      if not found, clear bkgrdflag and proceed with normal fsck
 320          */
 321         if (bkgrdflag) {
 322                 if (mntp == NULL) {
 323                         bkgrdflag = 0;
 324                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 325                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 326                         bkgrdflag = 0;
 327                         pfatal(
 328                           "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
 329                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 330                         bkgrdflag = 0;
 331                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 332                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 333                         if (readsb(0) != 0) {
 334                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 335                                         bkgrdflag = 0;
 336                                         pfatal(
 337                         "UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
 338                                 }
 339                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 340                                     skipclean && ckclean) {
 341                                         /*
 342                                          * file system is clean;
 343                                          * skip snapshot and report it clean
 344                                          */
 345                                         pwarn(
 346                                         "FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 347                                         goto clean;
 348                                 }
 349                         }
 350                         close(fsreadfd);
 351                 }
 352                 if (bkgrdflag) {
 353                         snprintf(snapname, sizeof snapname, "%s/.snap",
 354                             mntp->f_mntonname);
 355                         if (stat(snapname, &snapdir) < 0) {
 356                                 if (errno != ENOENT) {
 357                                         bkgrdflag = 0;
 358                                         pfatal(
 359         "CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 360                                             snapname, strerror(errno));
 361                                 } else if ((grp = getgrnam("operator")) == NULL ||
 362                                            mkdir(snapname, 0770) < 0 ||
 363                                            chown(snapname, -1, grp->gr_gid) < 0 ||
 364                                            chmod(snapname, 0770) < 0) {
 365                                         bkgrdflag = 0;
 366                                         pfatal(
 367         "CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 368                                             snapname, strerror(errno));
 369                                 }
 370                         } else if (!S_ISDIR(snapdir.st_mode)) {
 371                                 bkgrdflag = 0;
 372                                 pfatal(
 373                         "%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
 374                                     snapname);
 375                         }
 376                 }
 377                 if (bkgrdflag) {
 378                         snprintf(snapname, sizeof snapname,
 379                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 380                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 381                         build_iovec(&iov, &iovlen, "from", snapname,
 382                             (size_t)-1);
 383                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 384                             (size_t)-1);
 385                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 386                             sizeof(errmsg));
 387                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 388                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 389
 390                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 391                                 if (errno == EEXIST && unlink(snapname) == 0)
 392                                         continue;
 393                                 bkgrdflag = 0;
 394                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 395                                     snapname, strerror(errno), errmsg);
 396                                 break;
 397                         }
 398                         if (bkgrdflag != 0)
 399                                 filesys = snapname;
 400                 }
 401         }
 402
 403         switch (setup(filesys)) {
 404         case 0:
 405                 if (preen)
 406                         pfatal("CAN'T CHECK FILE SYSTEM.");
 407                 return (0);
 408         case -1:
 409         clean:
 410                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 411                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 412                 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
 413                     (intmax_t)sblock.fs_cstotal.cs_nffree,
 414                     (intmax_t)sblock.fs_cstotal.cs_nbfree,
 415                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 416                 return (0);
 417         }
 418         /*
 419          * Determine if we can and should do journal recovery.
 420          */
 421         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 422                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 423                         if (preen || reply("USE JOURNAL")) {
 424                                 if (suj_check(filesys) == 0) {
 425                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 426                                         if (chkdoreload(mntp) == 0)
 427                                                 exit(0);
 428                                         exit(4);
 429                                 }
 430                         }
 431                         printf("** Skipping journal, falling through to full fsck\n\n");
 432                 }
 433                 /*
 434                  * Write the superblock so we don't try to recover the
 435                  * journal on another pass. If this is the only change
 436                  * to the filesystem, we do not want it to be called
 437                  * out as modified.
 438                  */
 439                 sblock.fs_mtime = time(NULL);
 440                 sbdirty();
 441                 ofsmodified = fsmodified;
 442                 flush(fswritefd, &sblk);
 443                 fsmodified = ofsmodified;
 444         }
 445
 446         /*
 447          * Cleared if any questions answered no. Used to decide if
 448          * the superblock should be marked clean.
 449          */
 450         resolved = 1;
 451         /*
 452          * 1: scan inodes tallying blocks used
 453          */
 454         if (preen == 0) {
 455                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 456                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 457                         printf("** Root file system\n");
 458                 printf("** Phase 1 - Check Blocks and Sizes\n");
 459         }
 460         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 461         pass1();
 462         IOstats("Pass1");
 463
 464         /*
 465          * 1b: locate first references to duplicates, if any
 466          */
 467         if (duplist) {
 468                 if (preen || usedsoftdep)
 469                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 470                             preen ? "-p" : "",
 471                             (preen && usedsoftdep) ? " and " : "",
 472                             usedsoftdep ? "softupdates" : "");
 473                 printf("** Phase 1b - Rescan For More DUPS\n");
 474                 pass1b();
 475                 IOstats("Pass1b");
 476         }
 477
 478         /*
 479          * 2: traverse directories from root to mark all connected directories
 480          */
 481         if (preen == 0)
 482                 printf("** Phase 2 - Check Pathnames\n");
 483         pass2();
 484         IOstats("Pass2");
 485
 486         /*
 487          * 3: scan inodes looking for disconnected directories
 488          */
 489         if (preen == 0)
 490                 printf("** Phase 3 - Check Connectivity\n");
 491         pass3();
 492         IOstats("Pass3");
 493
 494         /*
 495          * 4: scan inodes looking for disconnected files; check reference counts
 496          */
 497         if (preen == 0)
 498                 printf("** Phase 4 - Check Reference Counts\n");
 499         pass4();
 500         IOstats("Pass4");
 501
 502         /*
 503          * 5: check and repair resource counts in cylinder groups
 504          */
 505         if (preen == 0)
 506                 printf("** Phase 5 - Check Cyl groups\n");
 507         pass5();
 508         IOstats("Pass5");
 509
 510         /*
 511          * print out summary statistics
 512          */
 513         n_ffree = sblock.fs_cstotal.cs_nffree;
 514         n_bfree = sblock.fs_cstotal.cs_nbfree;
 515         files = maxino - ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 516         blks = n_blks +
 517             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 518         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 519         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 520         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 521         if (bkgrdflag && (files > 0 || blks > 0)) {
 522                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 523                 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
 524                     countdirs, files - countdirs, blks);
 525         }
 526         pwarn("%ld files, %jd used, %ju free ",
 527             (long)n_files, (intmax_t)n_blks,
 528             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 529         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 530             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 531             n_ffree * 100.0 / sblock.fs_dsize);
 532         if (debug) {
 533                 if (files < 0)
 534                         printf("%jd inodes missing\n", -files);
 535                 if (blks < 0)
 536                         printf("%jd blocks missing\n", -blks);
 537                 if (duplist != NULL) {
 538                         printf("The following duplicate blocks remain:");
 539                         for (dp = duplist; dp; dp = dp->next)
 540                                 printf(" %jd,", (intmax_t)dp->dup);
 541                         printf("\n");
 542                 }
 543         }
 544         duplist = (struct dups *)0;
 545         muldup = (struct dups *)0;
 546         inocleanup();
 547         if (fsmodified) {
 548                 sblock.fs_time = time(NULL);
 549                 sbdirty();
 550         }
 551         if (cvtlevel && sblk.b_dirty) {
 552                 /*
 553                  * Write out the duplicate super blocks
 554                  */
 555                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 556                         blwrite(fswritefd, (char *)&sblock,
 557                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 558                             SBLOCKSIZE);
 559         }
 560         if (rerun)
 561                 resolved = 0;
 562         finalIOstats();
 563
 564         /*
 565          * Check to see if the file system is mounted read-write.
 566          */
 567         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 568                 resolved = 0;
 569         ckfini(resolved);
 570
 571         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 572                 if (inostathead[cylno].il_stat != NULL)
 573                         free((char *)inostathead[cylno].il_stat);
 574         free((char *)inostathead);
 575         inostathead = NULL;
 576         if (fsmodified && !preen)
 577                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 578         if (rerun) {
 579                 if (wantrestart && (restarts++ < 10) &&
 580                     (preen || reply("RESTART")))
 581                         return (ERESTART);
 582                 printf("\n***** PLEASE RERUN FSCK *****\n");
 583         }
 584         if (chkdoreload(mntp) != 0) {
 585                 if (!fsmodified)
 586                         return (0);
 587                 if (!preen)
 588                         printf("\n***** REBOOT NOW *****\n");
 589                 sync();
 590                 return (4);
 591         }
 592         return (rerun ? ERERUN : 0);
 593 }
 594
 595 static int
 596 chkdoreload(struct statfs *mntp)
 597 {
 598         struct iovec *iov;
 599         int iovlen;
 600         char errmsg[255];
 601
 602         if (mntp == NULL)
 603                 return (0);
 604
 605         iov = NULL;
 606         iovlen = 0;
 607         errmsg[0] = '\0';
 608         /*
 609          * We modified a mounted file system.  Do a mount update on
 610          * it unless it is read-write, so we can continue using it
 611          * as safely as possible.
 612          */
 613         if (mntp->f_flags & MNT_RDONLY) {
 614                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 615                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 616                     (size_t)-1);
 617                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 618                     (size_t)-1);
 619                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 620                     sizeof(errmsg));
 621                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 622                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 623                 /*
 624                  * XX: We need the following line until we clean up
 625                  * nmount parsing of root mounts and NFS root mounts.
 626                  */
 627                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 628                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 629                         return (0);
 630                 }
 631                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 632                     mntp->f_mntonname, strerror(errno), errmsg);
 633                 return (1);
 634         }
 635         return (0);
 636 }
 637
 638 /*
 639  * Get the mount point information for name.
 640  */
 641 static struct statfs *
 642 getmntpt(const char *name)
 643 {
 644         struct stat devstat, mntdevstat;
 645         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 646         char *ddevname;
 647         struct statfs *mntbuf, *statfsp;
 648         int i, mntsize, isdev;
 649
 650         if (stat(name, &devstat) != 0)
 651                 return (NULL);
 652         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 653                 isdev = 1;
 654         else
 655                 isdev = 0;
 656         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 657         for (i = 0; i < mntsize; i++) {
 658                 statfsp = &mntbuf[i];
 659                 ddevname = statfsp->f_mntfromname;
 660                 if (*ddevname != '/') {
 661                         if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
 662                             sizeof(statfsp->f_mntfromname))
 663                                 continue;
 664                         strcpy(device, _PATH_DEV);
 665                         strcat(device, ddevname);
 666                         strcpy(statfsp->f_mntfromname, device);
 667                 }
 668                 if (isdev == 0) {
 669                         if (strcmp(name, statfsp->f_mntonname))
 670                                 continue;
 671                         return (statfsp);
 672                 }
 673                 if (stat(ddevname, &mntdevstat) == 0 &&
 674                     mntdevstat.st_rdev == devstat.st_rdev)
 675                         return (statfsp);
 676         }
 677         statfsp = NULL;
 678         return (statfsp);
 679 }
 680
 681 static void
 682 usage(void)
 683 {
 684         (void) fprintf(stderr,
 685 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
 686             getprogname());
 687         exit(1);
 688 }
 689
 690 void
 691 infohandler(int sig __unused)
 692 {
 693         got_siginfo = 1;
 694 }
 695
 696 void
 697 alarmhandler(int sig __unused)
 698 {
 699         got_sigalarm = 1;
 700 }