sbin/fsck_ffs/main.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1986, 1993
   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 #if 0
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1980, 1986, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/14/95";
  41 #endif /* not lint */
  42 #endif
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD$");
  45
  46 #define IN_RTLD                 /* So we pickup the P_OSREL defines */
  47 #include <sys/param.h>
  48 #include <sys/file.h>
  49 #include <sys/mount.h>
  50 #include <sys/resource.h>
  51 #include <sys/stat.h>
  52 #include <sys/sysctl.h>
  53 #include <sys/uio.h>
  54 #include <sys/disklabel.h>
  55
  56 #include <ufs/ufs/dinode.h>
  57 #include <ufs/ffs/fs.h>
  58
  59 #include <err.h>
  60 #include <errno.h>
  61 #include <fstab.h>
  62 #include <grp.h>
  63 #include <inttypes.h>
  64 #include <mntopts.h>
  65 #include <paths.h>
  66 #include <stdint.h>
  67 #include <string.h>
  68 #include <time.h>
  69
  70 #include "fsck.h"
  71
  72 int     restarts;
  73
  74 static void usage(void) __dead2;
  75 static intmax_t argtoimax(int flag, const char *req, const char *str, int base);
  76 static int checkfilesys(char *filesys);
  77 static int chkdoreload(struct statfs *mntp);
  78 static struct statfs *getmntpt(const char *);
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         int ch;
  84         struct rlimit rlimit;
  85         struct itimerval itimerval;
  86         int fsret;
  87         int ret = 0;
  88
  89         sync();
  90         skipclean = 1;
  91         inoopt = 0;
  92         while ((ch = getopt(argc, argv, "b:Bc:CdEfFm:npRrSyZz")) != -1) {
  93                 switch (ch) {
  94                 case 'b':
  95                         skipclean = 0;
  96                         bflag = argtoimax('b', "number", optarg, 10);
  97                         printf("Alternate super block location: %jd\n", bflag);
  98                         break;
  99
 100                 case 'B':
 101                         bkgrdflag = 1;
 102                         break;
 103
 104                 case 'c':
 105                         skipclean = 0;
 106                         cvtlevel = argtoimax('c', "conversion level", optarg,
 107                             10);
 108                         if (cvtlevel < 3)
 109                                 errx(EEXIT, "cannot do level %d conversion",
 110                                     cvtlevel);
 111                         break;
 112
 113                 case 'd':
 114                         debug++;
 115                         break;
 116
 117                 case 'E':
 118                         Eflag++;
 119                         break;
 120
 121                 case 'f':
 122                         skipclean = 0;
 123                         break;
 124
 125                 case 'F':
 126                         bkgrdcheck = 1;
 127                         break;
 128
 129                 case 'm':
 130                         lfmode = argtoimax('m', "mode", optarg, 8);
 131                         if (lfmode &~ 07777)
 132                                 errx(EEXIT, "bad mode to -m: %o", lfmode);
 133                         printf("** lost+found creation mode %o\n", lfmode);
 134                         break;
 135
 136                 case 'n':
 137                         nflag++;
 138                         yflag = 0;
 139                         break;
 140
 141                 case 'p':
 142                         preen++;
 143                         /*FALLTHROUGH*/
 144
 145                 case 'C':
 146                         ckclean++;
 147                         break;
 148
 149                 case 'R':
 150                         wantrestart = 1;
 151                         break;
 152                 case 'r':
 153                         inoopt++;
 154                         break;
 155
 156                 case 'S':
 157                         surrender = 1;
 158                         break;
 159
 160                 case 'y':
 161                         yflag++;
 162                         nflag = 0;
 163                         break;
 164
 165                 case 'Z':
 166                         Zflag++;
 167                         break;
 168
 169                 case 'z':
 170                         zflag++;
 171                         break;
 172
 173                 default:
 174                         usage();
 175                 }
 176         }
 177         argc -= optind;
 178         argv += optind;
 179
 180         if (!argc)
 181                 usage();
 182
 183         if (signal(SIGINT, SIG_IGN) != SIG_IGN)
 184                 (void)signal(SIGINT, catch);
 185         if (ckclean)
 186                 (void)signal(SIGQUIT, catchquit);
 187         signal(SIGINFO, infohandler);
 188         if (bkgrdflag) {
 189                 signal(SIGALRM, alarmhandler);
 190                 itimerval.it_interval.tv_sec = 5;
 191                 itimerval.it_interval.tv_usec = 0;
 192                 itimerval.it_value.tv_sec = 5;
 193                 itimerval.it_value.tv_usec = 0;
 194                 setitimer(ITIMER_REAL, &itimerval, NULL);
 195         }
 196         /*
 197          * Push up our allowed memory limit so we can cope
 198          * with huge file systems.
 199          */
 200         if (getrlimit(RLIMIT_DATA, &rlimit) == 0) {
 201                 rlimit.rlim_cur = rlimit.rlim_max;
 202                 (void)setrlimit(RLIMIT_DATA, &rlimit);
 203         }
 204         while (argc > 0) {
 205                 if ((fsret = checkfilesys(*argv)) == ERESTART)
 206                         continue;
 207                 ret |= fsret;
 208                 argc--;
 209                 argv++;
 210         }
 211
 212         if (returntosingle)
 213                 ret = 2;
 214         exit(ret);
 215 }
 216
 217 static intmax_t
 218 argtoimax(int flag, const char *req, const char *str, int base)
 219 {
 220         char *cp;
 221         intmax_t ret;
 222
 223         ret = strtoimax(str, &cp, base);
 224         if (cp == str || *cp)
 225                 errx(EEXIT, "-%c flag requires a %s", flag, req);
 226         return (ret);
 227 }
 228
 229 /*
 230  * Check the specified file system.
 231  */
 232 /* ARGSUSED */
 233 static int
 234 checkfilesys(char *filesys)
 235 {
 236         ufs2_daddr_t n_ffree, n_bfree;
 237         struct dups *dp;
 238         struct statfs *mntp;
 239         struct stat snapdir;
 240         struct group *grp;
 241         struct iovec *iov;
 242         char errmsg[255];
 243         int ofsmodified;
 244         int iovlen;
 245         int cylno;
 246         intmax_t blks, files;
 247         size_t size;
 248
 249         iov = NULL;
 250         iovlen = 0;
 251         errmsg[0] = '\0';
 252         fsutilinit();
 253         fsckinit();
 254
 255         cdevname = filesys;
 256         if (debug && ckclean)
 257                 pwarn("starting\n");
 258         /*
 259          * Make best effort to get the disk name. Check first to see
 260          * if it is listed among the mounted file systems. Failing that
 261          * check to see if it is listed in /etc/fstab.
 262          */
 263         mntp = getmntpt(filesys);
 264         if (mntp != NULL)
 265                 filesys = mntp->f_mntfromname;
 266         else
 267                 filesys = blockcheck(filesys);
 268         /*
 269          * If -F flag specified, check to see whether a background check
 270          * is possible and needed. If possible and needed, exit with
 271          * status zero. Otherwise exit with status non-zero. A non-zero
 272          * exit status will cause a foreground check to be run.
 273          */
 274         sblock_init();
 275         if (bkgrdcheck) {
 276                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 277                         exit(3);        /* Cannot read superblock */
 278                 close(fsreadfd);
 279                 /* Earlier background failed or journaled */
 280                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ))
 281                         exit(4);
 282                 if ((sblock.fs_flags & FS_DOSOFTDEP) == 0)
 283                         exit(5);        /* Not running soft updates */
 284                 size = MIBSIZE;
 285                 if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0)
 286                         exit(6);        /* Lacks kernel support */
 287                 if ((mntp == NULL && sblock.fs_clean == 1) ||
 288                     (mntp != NULL && (sblock.fs_flags & FS_UNCLEAN) == 0))
 289                         exit(7);        /* Filesystem clean, report it now */
 290                 exit(0);
 291         }
 292         if (ckclean && skipclean) {
 293                 /*
 294                  * If file system is gjournaled, check it here.
 295                  */
 296                 if ((fsreadfd = open(filesys, O_RDONLY)) < 0 || readsb(0) == 0)
 297                         exit(3);        /* Cannot read superblock */
 298                 close(fsreadfd);
 299                 if ((sblock.fs_flags & FS_GJOURNAL) != 0) {
 300                         //printf("GJournaled file system detected on %s.\n",
 301                         //    filesys);
 302                         if (sblock.fs_clean == 1) {
 303                                 pwarn("FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 304                                 exit(0);
 305                         }
 306                         if ((sblock.fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) == 0) {
 307                                 gjournal_check(filesys);
 308                                 if (chkdoreload(mntp) == 0)
 309                                         exit(0);
 310                                 exit(4);
 311                         } else {
 312                                 pfatal(
 313                             "UNEXPECTED INCONSISTENCY, CANNOT RUN FAST FSCK\n");
 314                         }
 315                 }
 316         }
 317         /*
 318          * If we are to do a background check:
 319          *      Get the mount point information of the file system
 320          *      create snapshot file
 321          *      return created snapshot file
 322          *      if not found, clear bkgrdflag and proceed with normal fsck
 323          */
 324         if (bkgrdflag) {
 325                 if (mntp == NULL) {
 326                         bkgrdflag = 0;
 327                         pfatal("NOT MOUNTED, CANNOT RUN IN BACKGROUND\n");
 328                 } else if ((mntp->f_flags & MNT_SOFTDEP) == 0) {
 329                         bkgrdflag = 0;
 330                         pfatal(
 331                           "NOT USING SOFT UPDATES, CANNOT RUN IN BACKGROUND\n");
 332                 } else if ((mntp->f_flags & MNT_RDONLY) != 0) {
 333                         bkgrdflag = 0;
 334                         pfatal("MOUNTED READ-ONLY, CANNOT RUN IN BACKGROUND\n");
 335                 } else if ((fsreadfd = open(filesys, O_RDONLY)) >= 0) {
 336                         if (readsb(0) != 0) {
 337                                 if (sblock.fs_flags & (FS_NEEDSFSCK | FS_SUJ)) {
 338                                         bkgrdflag = 0;
 339                                         pfatal(
 340                         "UNEXPECTED INCONSISTENCY, CANNOT RUN IN BACKGROUND\n");
 341                                 }
 342                                 if ((sblock.fs_flags & FS_UNCLEAN) == 0 &&
 343                                     skipclean && ckclean) {
 344                                         /*
 345                                          * file system is clean;
 346                                          * skip snapshot and report it clean
 347                                          */
 348                                         pwarn(
 349                                         "FILE SYSTEM CLEAN; SKIPPING CHECKS\n");
 350                                         goto clean;
 351                                 }
 352                         }
 353                         close(fsreadfd);
 354                 }
 355                 if (bkgrdflag) {
 356                         snprintf(snapname, sizeof snapname, "%s/.snap",
 357                             mntp->f_mntonname);
 358                         if (stat(snapname, &snapdir) < 0) {
 359                                 if (errno != ENOENT) {
 360                                         bkgrdflag = 0;
 361                                         pfatal(
 362         "CANNOT FIND SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 363                                             snapname, strerror(errno));
 364                                 } else if ((grp = getgrnam("operator")) == NULL ||
 365                                            mkdir(snapname, 0770) < 0 ||
 366                                            chown(snapname, -1, grp->gr_gid) < 0 ||
 367                                            chmod(snapname, 0770) < 0) {
 368                                         bkgrdflag = 0;
 369                                         pfatal(
 370         "CANNOT CREATE SNAPSHOT DIRECTORY %s: %s, CANNOT RUN IN BACKGROUND\n",
 371                                             snapname, strerror(errno));
 372                                 }
 373                         } else if (!S_ISDIR(snapdir.st_mode)) {
 374                                 bkgrdflag = 0;
 375                                 pfatal(
 376                         "%s IS NOT A DIRECTORY, CANNOT RUN IN BACKGROUND\n",
 377                                     snapname);
 378                         }
 379                 }
 380                 if (bkgrdflag) {
 381                         snprintf(snapname, sizeof snapname,
 382                             "%s/.snap/fsck_snapshot", mntp->f_mntonname);
 383                         build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 384                         build_iovec(&iov, &iovlen, "from", snapname,
 385                             (size_t)-1);
 386                         build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 387                             (size_t)-1);
 388                         build_iovec(&iov, &iovlen, "errmsg", errmsg,
 389                             sizeof(errmsg));
 390                         build_iovec(&iov, &iovlen, "update", NULL, 0);
 391                         build_iovec(&iov, &iovlen, "snapshot", NULL, 0);
 392
 393                         while (nmount(iov, iovlen, mntp->f_flags) < 0) {
 394                                 if (errno == EEXIST && unlink(snapname) == 0)
 395                                         continue;
 396                                 bkgrdflag = 0;
 397                                 pfatal("CANNOT CREATE SNAPSHOT %s: %s %s\n",
 398                                     snapname, strerror(errno), errmsg);
 399                                 break;
 400                         }
 401                         if (bkgrdflag != 0)
 402                                 filesys = snapname;
 403                 }
 404         }
 405
 406         switch (setup(filesys)) {
 407         case 0:
 408                 if (preen)
 409                         pfatal("CAN'T CHECK FILE SYSTEM.");
 410                 return (0);
 411         case -1:
 412         clean:
 413                 pwarn("clean, %ld free ", (long)(sblock.fs_cstotal.cs_nffree +
 414                     sblock.fs_frag * sblock.fs_cstotal.cs_nbfree));
 415                 printf("(%jd frags, %jd blocks, %.1f%% fragmentation)\n",
 416                     (intmax_t)sblock.fs_cstotal.cs_nffree,
 417                     (intmax_t)sblock.fs_cstotal.cs_nbfree,
 418                     sblock.fs_cstotal.cs_nffree * 100.0 / sblock.fs_dsize);
 419                 return (0);
 420         }
 421         /*
 422          * Determine if we can and should do journal recovery.
 423          */
 424         if ((sblock.fs_flags & FS_SUJ) == FS_SUJ) {
 425                 if ((sblock.fs_flags & FS_NEEDSFSCK) != FS_NEEDSFSCK && skipclean) {
 426                         if (preen || reply("USE JOURNAL")) {
 427                                 if (suj_check(filesys) == 0) {
 428                                         printf("\n***** FILE SYSTEM MARKED CLEAN *****\n");
 429                                         if (chkdoreload(mntp) == 0)
 430                                                 exit(0);
 431                                         exit(4);
 432                                 }
 433                         }
 434                         printf("** Skipping journal, falling through to full fsck\n\n");
 435                 }
 436                 /*
 437                  * Write the superblock so we don't try to recover the
 438                  * journal on another pass. If this is the only change
 439                  * to the filesystem, we do not want it to be called
 440                  * out as modified.
 441                  */
 442                 sblock.fs_mtime = time(NULL);
 443                 sbdirty();
 444                 ofsmodified = fsmodified;
 445                 flush(fswritefd, &sblk);
 446                 fsmodified = ofsmodified;
 447         }
 448         /*
 449          * If the filesystem was run on an old kernel that did not
 450          * support check hashes, clear the check-hash flags so that
 451          * we do not try to verify them.
 452          */
 453         if ((sblock.fs_flags & FS_METACKHASH) == 0)
 454                 sblock.fs_metackhash = 0;
 455         /*
 456          * If we are running on a kernel that can provide check hashes
 457          * that are not yet enabled for the filesystem and we are
 458          * running manually without the -y flag, offer to add any
 459          * supported check hashes that are not already enabled.
 460          */
 461         ckhashadd = 0;
 462         if (preen == 0 && yflag == 0 && sblock.fs_magic != FS_UFS1_MAGIC &&
 463             fswritefd != -1 && getosreldate() >= P_OSREL_CK_CYLGRP) {
 464                 if ((sblock.fs_metackhash & CK_CYLGRP) == 0 &&
 465                     reply("ADD CYLINDER GROUP CHECK-HASH PROTECTION") != 0)
 466                         ckhashadd |= CK_CYLGRP;
 467 #ifdef notyet
 468                 if ((sblock.fs_metackhash & CK_SUPERBLOCK) == 0 &&
 469                     getosreldate() >= P_OSREL_CK_SUPERBLOCK &&
 470                     reply("ADD SUPERBLOCK CHECK-HASH PROTECTION") != 0)
 471                         ckhashadd |= CK_SUPERBLOCK;
 472                 if ((sblock.fs_metackhash & CK_INODE) == 0 &&
 473                     getosreldate() >= P_OSREL_CK_INODE &&
 474                     reply("ADD INODE CHECK-HASH PROTECTION") != 0)
 475                         ckhashadd |= CK_INODE;
 476                 if ((sblock.fs_metackhash & CK_INDIR) == 0 &&
 477                     getosreldate() >= P_OSREL_CK_INDIR &&
 478                     reply("ADD INDIRECT BLOCK CHECK-HASH PROTECTION") != 0)
 479                         ckhashadd |= CK_INDIR;
 480                 if ((sblock.fs_metackhash & CK_DIR) == 0 &&
 481                     getosreldate() >= P_OSREL_CK_DIR &&
 482                     reply("ADD DIRECTORY CHECK-HASH PROTECTION") != 0)
 483                         ckhashadd |= CK_DIR;
 484 #endif /* notyet */
 485                 if (ckhashadd != 0)
 486                         sblock.fs_flags |= FS_METACKHASH;
 487         }
 488         /*
 489          * Cleared if any questions answered no. Used to decide if
 490          * the superblock should be marked clean.
 491          */
 492         resolved = 1;
 493         /*
 494          * 1: scan inodes tallying blocks used
 495          */
 496         if (preen == 0) {
 497                 printf("** Last Mounted on %s\n", sblock.fs_fsmnt);
 498                 if (mntp != NULL && mntp->f_flags & MNT_ROOTFS)
 499                         printf("** Root file system\n");
 500                 printf("** Phase 1 - Check Blocks and Sizes\n");
 501         }
 502         clock_gettime(CLOCK_REALTIME_PRECISE, &startprog);
 503         pass1();
 504         IOstats("Pass1");
 505
 506         /*
 507          * 1b: locate first references to duplicates, if any
 508          */
 509         if (duplist) {
 510                 if (preen || usedsoftdep)
 511                         pfatal("INTERNAL ERROR: dups with %s%s%s",
 512                             preen ? "-p" : "",
 513                             (preen && usedsoftdep) ? " and " : "",
 514                             usedsoftdep ? "softupdates" : "");
 515                 printf("** Phase 1b - Rescan For More DUPS\n");
 516                 pass1b();
 517                 IOstats("Pass1b");
 518         }
 519
 520         /*
 521          * 2: traverse directories from root to mark all connected directories
 522          */
 523         if (preen == 0)
 524                 printf("** Phase 2 - Check Pathnames\n");
 525         pass2();
 526         IOstats("Pass2");
 527
 528         /*
 529          * 3: scan inodes looking for disconnected directories
 530          */
 531         if (preen == 0)
 532                 printf("** Phase 3 - Check Connectivity\n");
 533         pass3();
 534         IOstats("Pass3");
 535
 536         /*
 537          * 4: scan inodes looking for disconnected files; check reference counts
 538          */
 539         if (preen == 0)
 540                 printf("** Phase 4 - Check Reference Counts\n");
 541         pass4();
 542         IOstats("Pass4");
 543
 544         /*
 545          * 5: check and repair resource counts in cylinder groups
 546          */
 547         if (preen == 0)
 548                 printf("** Phase 5 - Check Cyl groups\n");
 549         pass5();
 550         IOstats("Pass5");
 551
 552         /*
 553          * print out summary statistics
 554          */
 555         n_ffree = sblock.fs_cstotal.cs_nffree;
 556         n_bfree = sblock.fs_cstotal.cs_nbfree;
 557         files = maxino - UFS_ROOTINO - sblock.fs_cstotal.cs_nifree - n_files;
 558         blks = n_blks +
 559             sblock.fs_ncg * (cgdmin(&sblock, 0) - cgsblock(&sblock, 0));
 560         blks += cgsblock(&sblock, 0) - cgbase(&sblock, 0);
 561         blks += howmany(sblock.fs_cssize, sblock.fs_fsize);
 562         blks = maxfsblock - (n_ffree + sblock.fs_frag * n_bfree) - blks;
 563         if (bkgrdflag && (files > 0 || blks > 0)) {
 564                 countdirs = sblock.fs_cstotal.cs_ndir - countdirs;
 565                 pwarn("Reclaimed: %ld directories, %jd files, %jd fragments\n",
 566                     countdirs, files - countdirs, blks);
 567         }
 568         pwarn("%ld files, %jd used, %ju free ",
 569             (long)n_files, (intmax_t)n_blks,
 570             (uintmax_t)n_ffree + sblock.fs_frag * n_bfree);
 571         printf("(%ju frags, %ju blocks, %.1f%% fragmentation)\n",
 572             (uintmax_t)n_ffree, (uintmax_t)n_bfree,
 573             n_ffree * 100.0 / sblock.fs_dsize);
 574         if (debug) {
 575                 if (files < 0)
 576                         printf("%jd inodes missing\n", -files);
 577                 if (blks < 0)
 578                         printf("%jd blocks missing\n", -blks);
 579                 if (duplist != NULL) {
 580                         printf("The following duplicate blocks remain:");
 581                         for (dp = duplist; dp; dp = dp->next)
 582                                 printf(" %jd,", (intmax_t)dp->dup);
 583                         printf("\n");
 584                 }
 585         }
 586         duplist = (struct dups *)0;
 587         muldup = (struct dups *)0;
 588         inocleanup();
 589         if (fsmodified) {
 590                 sblock.fs_time = time(NULL);
 591                 sbdirty();
 592         }
 593         if (cvtlevel && sblk.b_dirty) {
 594                 /*
 595                  * Write out the duplicate super blocks
 596                  */
 597                 for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 598                         blwrite(fswritefd, (char *)&sblock,
 599                             fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 600                             SBLOCKSIZE);
 601         }
 602         if (rerun)
 603                 resolved = 0;
 604         finalIOstats();
 605
 606         /*
 607          * Check to see if the file system is mounted read-write.
 608          */
 609         if (bkgrdflag == 0 && mntp != NULL && (mntp->f_flags & MNT_RDONLY) == 0)
 610                 resolved = 0;
 611         ckfini(resolved);
 612
 613         for (cylno = 0; cylno < sblock.fs_ncg; cylno++)
 614                 if (inostathead[cylno].il_stat != NULL)
 615                         free((char *)inostathead[cylno].il_stat);
 616         free((char *)inostathead);
 617         inostathead = NULL;
 618         if (fsmodified && !preen)
 619                 printf("\n***** FILE SYSTEM WAS MODIFIED *****\n");
 620         if (rerun) {
 621                 if (wantrestart && (restarts++ < 10) &&
 622                     (preen || reply("RESTART")))
 623                         return (ERESTART);
 624                 printf("\n***** PLEASE RERUN FSCK *****\n");
 625         }
 626         if (chkdoreload(mntp) != 0) {
 627                 if (!fsmodified)
 628                         return (0);
 629                 if (!preen)
 630                         printf("\n***** REBOOT NOW *****\n");
 631                 sync();
 632                 return (4);
 633         }
 634         return (rerun ? ERERUN : 0);
 635 }
 636
 637 static int
 638 chkdoreload(struct statfs *mntp)
 639 {
 640         struct iovec *iov;
 641         int iovlen;
 642         char errmsg[255];
 643
 644         if (mntp == NULL)
 645                 return (0);
 646
 647         iov = NULL;
 648         iovlen = 0;
 649         errmsg[0] = '\0';
 650         /*
 651          * We modified a mounted file system.  Do a mount update on
 652          * it unless it is read-write, so we can continue using it
 653          * as safely as possible.
 654          */
 655         if (mntp->f_flags & MNT_RDONLY) {
 656                 build_iovec(&iov, &iovlen, "fstype", "ffs", 4);
 657                 build_iovec(&iov, &iovlen, "from", mntp->f_mntfromname,
 658                     (size_t)-1);
 659                 build_iovec(&iov, &iovlen, "fspath", mntp->f_mntonname,
 660                     (size_t)-1);
 661                 build_iovec(&iov, &iovlen, "errmsg", errmsg,
 662                     sizeof(errmsg));
 663                 build_iovec(&iov, &iovlen, "update", NULL, 0);
 664                 build_iovec(&iov, &iovlen, "reload", NULL, 0);
 665                 /*
 666                  * XX: We need the following line until we clean up
 667                  * nmount parsing of root mounts and NFS root mounts.
 668                  */
 669                 build_iovec(&iov, &iovlen, "ro", NULL, 0);
 670                 if (nmount(iov, iovlen, mntp->f_flags) == 0) {
 671                         return (0);
 672                 }
 673                 pwarn("mount reload of '%s' failed: %s %s\n\n",
 674                     mntp->f_mntonname, strerror(errno), errmsg);
 675                 return (1);
 676         }
 677         return (0);
 678 }
 679
 680 /*
 681  * Get the mount point information for name.
 682  */
 683 static struct statfs *
 684 getmntpt(const char *name)
 685 {
 686         struct stat devstat, mntdevstat;
 687         char device[sizeof(_PATH_DEV) - 1 + MNAMELEN];
 688         char *ddevname;
 689         struct statfs *mntbuf, *statfsp;
 690         int i, mntsize, isdev;
 691
 692         if (stat(name, &devstat) != 0)
 693                 return (NULL);
 694         if (S_ISCHR(devstat.st_mode) || S_ISBLK(devstat.st_mode))
 695                 isdev = 1;
 696         else
 697                 isdev = 0;
 698         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 699         for (i = 0; i < mntsize; i++) {
 700                 statfsp = &mntbuf[i];
 701                 ddevname = statfsp->f_mntfromname;
 702                 if (*ddevname != '/') {
 703                         if (strlen(_PATH_DEV) + strlen(ddevname) + 1 >
 704                             sizeof(statfsp->f_mntfromname))
 705                                 continue;
 706                         strcpy(device, _PATH_DEV);
 707                         strcat(device, ddevname);
 708                         strcpy(statfsp->f_mntfromname, device);
 709                 }
 710                 if (isdev == 0) {
 711                         if (strcmp(name, statfsp->f_mntonname))
 712                                 continue;
 713                         return (statfsp);
 714                 }
 715                 if (stat(ddevname, &mntdevstat) == 0 &&
 716                     mntdevstat.st_rdev == devstat.st_rdev)
 717                         return (statfsp);
 718         }
 719         statfsp = NULL;
 720         return (statfsp);
 721 }
 722
 723 static void
 724 usage(void)
 725 {
 726         (void) fprintf(stderr,
 727 "usage: %s [-BCdEFfnpRrSyZ] [-b block] [-c level] [-m mode] filesystem ...\n",
 728             getprogname());
 729         exit(1);
 730 }
 731
 732 void
 733 infohandler(int sig __unused)
 734 {
 735         got_siginfo = 1;
 736 }
 737
 738 void
 739 alarmhandler(int sig __unused)
 740 {
 741         got_sigalarm = 1;
 742 }