sbin/fsck_ffs/fsutil.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 sccsid[] = "@(#)utilities.c   8.6 (Berkeley) 5/19/95";
  33 #endif /* not lint */
  34 #endif
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/time.h>
  40 #include <sys/types.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/disk.h>
  43 #include <sys/disklabel.h>
  44 #include <sys/ioctl.h>
  45 #include <sys/stat.h>
  46
  47 #include <ufs/ufs/dinode.h>
  48 #include <ufs/ufs/dir.h>
  49 #include <ufs/ffs/fs.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <string.h>
  54 #include <ctype.h>
  55 #include <fstab.h>
  56 #include <stdint.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <time.h>
  60 #include <unistd.h>
  61
  62 #include "fsck.h"
  63
  64 static void slowio_start(void);
  65 static void slowio_end(void);
  66 static void printIOstats(void);
  67
  68 static long diskreads, totaldiskreads, totalreads; /* Disk cache statistics */
  69 static struct timespec startpass, finishpass;
  70 struct timeval slowio_starttime;
  71 int slowio_delay_usec = 10000;  /* Initial IO delay for background fsck */
  72 int slowio_pollcnt;
  73 static struct bufarea cgblk;    /* backup buffer for cylinder group blocks */
  74 static TAILQ_HEAD(buflist, bufarea) bufhead;    /* head of buffer cache list */
  75 static int numbufs;                             /* size of buffer cache */
  76 static char *buftype[BT_NUMBUFTYPES] = BT_NAMES;
  77
  78 int
  79 ftypeok(union dinode *dp)
  80 {
  81         switch (DIP(dp, di_mode) & IFMT) {
  82
  83         case IFDIR:
  84         case IFREG:
  85         case IFBLK:
  86         case IFCHR:
  87         case IFLNK:
  88         case IFSOCK:
  89         case IFIFO:
  90                 return (1);
  91
  92         default:
  93                 if (debug)
  94                         printf("bad file type 0%o\n", DIP(dp, di_mode));
  95                 return (0);
  96         }
  97 }
  98
  99 int
 100 reply(const char *question)
 101 {
 102         int persevere;
 103         char c;
 104
 105         if (preen)
 106                 pfatal("INTERNAL ERROR: GOT TO reply()");
 107         persevere = !strcmp(question, "CONTINUE");
 108         printf("\n");
 109         if (!persevere && (nflag || (fswritefd < 0 && bkgrdflag == 0))) {
 110                 printf("%s? no\n\n", question);
 111                 resolved = 0;
 112                 return (0);
 113         }
 114         if (yflag || (persevere && nflag)) {
 115                 printf("%s? yes\n\n", question);
 116                 return (1);
 117         }
 118         do      {
 119                 printf("%s? [yn] ", question);
 120                 (void) fflush(stdout);
 121                 c = getc(stdin);
 122                 while (c != '\n' && getc(stdin) != '\n') {
 123                         if (feof(stdin)) {
 124                                 resolved = 0;
 125                                 return (0);
 126                         }
 127                 }
 128         } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
 129         printf("\n");
 130         if (c == 'y' || c == 'Y')
 131                 return (1);
 132         resolved = 0;
 133         return (0);
 134 }
 135
 136 /*
 137  * Look up state information for an inode.
 138  */
 139 struct inostat *
 140 inoinfo(ino_t inum)
 141 {
 142         static struct inostat unallocated = { USTATE, 0, 0 };
 143         struct inostatlist *ilp;
 144         int iloff;
 145
 146         if (inum > maxino)
 147                 errx(EEXIT, "inoinfo: inumber %d out of range", inum);
 148         ilp = &inostathead[inum / sblock.fs_ipg];
 149         iloff = inum % sblock.fs_ipg;
 150         if (iloff >= ilp->il_numalloced)
 151                 return (&unallocated);
 152         return (&ilp->il_stat[iloff]);
 153 }
 154
 155 /*
 156  * Malloc buffers and set up cache.
 157  */
 158 void
 159 bufinit(void)
 160 {
 161         struct bufarea *bp;
 162         long bufcnt, i;
 163         char *bufp;
 164
 165         pbp = pdirbp = (struct bufarea *)0;
 166         bufp = Malloc((unsigned int)sblock.fs_bsize);
 167         if (bufp == 0)
 168                 errx(EEXIT, "cannot allocate buffer pool");
 169         cgblk.b_un.b_buf = bufp;
 170         initbarea(&cgblk, BT_CYLGRP);
 171         TAILQ_INIT(&bufhead);
 172         bufcnt = MAXBUFS;
 173         if (bufcnt < MINBUFS)
 174                 bufcnt = MINBUFS;
 175         for (i = 0; i < bufcnt; i++) {
 176                 bp = (struct bufarea *)Malloc(sizeof(struct bufarea));
 177                 bufp = Malloc((unsigned int)sblock.fs_bsize);
 178                 if (bp == NULL || bufp == NULL) {
 179                         if (i >= MINBUFS)
 180                                 break;
 181                         errx(EEXIT, "cannot allocate buffer pool");
 182                 }
 183                 bp->b_un.b_buf = bufp;
 184                 TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 185                 initbarea(bp, BT_UNKNOWN);
 186         }
 187         numbufs = i;    /* save number of buffers */
 188         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 189                 readtime[i].tv_sec = totalreadtime[i].tv_sec = 0;
 190                 readtime[i].tv_nsec = totalreadtime[i].tv_nsec = 0;
 191                 readcnt[i] = totalreadcnt[i] = 0;
 192         }
 193 }
 194
 195 /*
 196  * Manage cylinder group buffers.
 197  */
 198 static struct bufarea *cgbufs;  /* header for cylinder group cache */
 199 static int flushtries;          /* number of tries to reclaim memory */
 200
 201 struct bufarea *
 202 cgget(int cg)
 203 {
 204         struct bufarea *cgbp;
 205         struct cg *cgp;
 206
 207         if (cgbufs == NULL) {
 208                 cgbufs = Calloc(sblock.fs_ncg, sizeof(struct bufarea));
 209                 if (cgbufs == NULL)
 210                         errx(EEXIT, "cannot allocate cylinder group buffers");
 211         }
 212         cgbp = &cgbufs[cg];
 213         if (cgbp->b_un.b_cg != NULL)
 214                 return (cgbp);
 215         cgp = NULL;
 216         if (flushtries == 0)
 217                 cgp = malloc((unsigned int)sblock.fs_cgsize);
 218         if (cgp == NULL) {
 219                 getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
 220                 return (&cgblk);
 221         }
 222         cgbp->b_un.b_cg = cgp;
 223         initbarea(cgbp, BT_CYLGRP);
 224         getblk(cgbp, cgtod(&sblock, cg), sblock.fs_cgsize);
 225         return (cgbp);
 226 }
 227
 228 /*
 229  * Attempt to flush a cylinder group cache entry.
 230  * Return whether the flush was successful.
 231  */
 232 int
 233 flushentry(void)
 234 {
 235         struct bufarea *cgbp;
 236
 237         cgbp = &cgbufs[flushtries++];
 238         if (cgbp->b_un.b_cg == NULL)
 239                 return (0);
 240         flush(fswritefd, cgbp);
 241         free(cgbp->b_un.b_buf);
 242         cgbp->b_un.b_buf = NULL;
 243         return (1);
 244 }
 245
 246 /*
 247  * Manage a cache of directory blocks.
 248  */
 249 struct bufarea *
 250 getdatablk(ufs2_daddr_t blkno, long size, int type)
 251 {
 252         struct bufarea *bp;
 253
 254         TAILQ_FOREACH(bp, &bufhead, b_list)
 255                 if (bp->b_bno == fsbtodb(&sblock, blkno))
 256                         goto foundit;
 257         TAILQ_FOREACH_REVERSE(bp, &bufhead, buflist, b_list)
 258                 if ((bp->b_flags & B_INUSE) == 0)
 259                         break;
 260         if (bp == NULL)
 261                 errx(EEXIT, "deadlocked buffer pool");
 262         bp->b_type = type;
 263         getblk(bp, blkno, size);
 264         /* fall through */
 265 foundit:
 266         if (debug && bp->b_type != type)
 267                 printf("Buffer type changed from %s to %s\n",
 268                     buftype[bp->b_type], buftype[type]);
 269         TAILQ_REMOVE(&bufhead, bp, b_list);
 270         TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 271         bp->b_flags |= B_INUSE;
 272         return (bp);
 273 }
 274
 275 /*
 276  * Timespec operations (from <sys/time.h>).
 277  */
 278 #define timespecsub(vvp, uvp)                                           \
 279         do {                                                            \
 280                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
 281                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
 282                 if ((vvp)->tv_nsec < 0) {                               \
 283                         (vvp)->tv_sec--;                                \
 284                         (vvp)->tv_nsec += 1000000000;                   \
 285                 }                                                       \
 286         } while (0)
 287 #define timespecadd(vvp, uvp)                                           \
 288         do {                                                            \
 289                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
 290                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
 291                 if ((vvp)->tv_nsec >= 1000000000) {                     \
 292                         (vvp)->tv_sec++;                                \
 293                         (vvp)->tv_nsec -= 1000000000;                   \
 294                 }                                                       \
 295         } while (0)
 296
 297 void
 298 getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
 299 {
 300         ufs2_daddr_t dblk;
 301         struct timespec start, finish;
 302
 303         dblk = fsbtodb(&sblock, blk);
 304         if (bp->b_bno == dblk) {
 305                 totalreads++;
 306         } else {
 307                 flush(fswritefd, bp);
 308                 if (debug) {
 309                         readcnt[bp->b_type]++;
 310                         clock_gettime(CLOCK_REALTIME_PRECISE, &start);
 311                 }
 312                 bp->b_errs = blread(fsreadfd, bp->b_un.b_buf, dblk, size);
 313                 if (debug) {
 314                         clock_gettime(CLOCK_REALTIME_PRECISE, &finish);
 315                         timespecsub(&finish, &start);
 316                         timespecadd(&readtime[bp->b_type], &finish);
 317                 }
 318                 bp->b_bno = dblk;
 319                 bp->b_size = size;
 320         }
 321 }
 322
 323 void
 324 flush(int fd, struct bufarea *bp)
 325 {
 326         int i, j;
 327
 328         if (!bp->b_dirty)
 329                 return;
 330         bp->b_dirty = 0;
 331         if (fswritefd < 0) {
 332                 pfatal("WRITING IN READ_ONLY MODE.\n");
 333                 return;
 334         }
 335         if (bp->b_errs != 0)
 336                 pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
 337                     (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
 338                     (long long)bp->b_bno);
 339         bp->b_errs = 0;
 340         blwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
 341         if (bp != &sblk)
 342                 return;
 343         for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
 344                 blwrite(fswritefd, (char *)sblock.fs_csp + i,
 345                     fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
 346                     sblock.fs_cssize - i < sblock.fs_bsize ?
 347                     sblock.fs_cssize - i : sblock.fs_bsize);
 348         }
 349 }
 350
 351 void
 352 rwerror(const char *mesg, ufs2_daddr_t blk)
 353 {
 354
 355         if (bkgrdcheck)
 356                 exit(EEXIT);
 357         if (preen == 0)
 358                 printf("\n");
 359         pfatal("CANNOT %s: %ld", mesg, (long)blk);
 360         if (reply("CONTINUE") == 0)
 361                 exit(EEXIT);
 362 }
 363
 364 void
 365 ckfini(int markclean)
 366 {
 367         struct bufarea *bp, *nbp;
 368         int ofsmodified, cnt;
 369
 370         if (bkgrdflag) {
 371                 unlink(snapname);
 372                 if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
 373                         cmd.value = FS_UNCLEAN;
 374                         cmd.size = markclean ? -1 : 1;
 375                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 376                             &cmd, sizeof cmd) == -1)
 377                                 rwerror("SET FILE SYSTEM FLAGS", FS_UNCLEAN);
 378                         if (!preen) {
 379                                 printf("\n***** FILE SYSTEM MARKED %s *****\n",
 380                                     markclean ? "CLEAN" : "DIRTY");
 381                                 if (!markclean)
 382                                         rerun = 1;
 383                         }
 384                 } else if (!preen && !markclean) {
 385                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 386                         rerun = 1;
 387                 }
 388         }
 389         if (debug && totalreads > 0)
 390                 printf("cache with %d buffers missed %ld of %ld (%d%%)\n",
 391                     numbufs, totaldiskreads, totalreads,
 392                     (int)(totaldiskreads * 100 / totalreads));
 393         if (fswritefd < 0) {
 394                 (void)close(fsreadfd);
 395                 return;
 396         }
 397         flush(fswritefd, &sblk);
 398         if (havesb && cursnapshot == 0 && sblock.fs_magic == FS_UFS2_MAGIC &&
 399             sblk.b_bno != sblock.fs_sblockloc / dev_bsize &&
 400             !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
 401                 sblk.b_bno = sblock.fs_sblockloc / dev_bsize;
 402                 sbdirty();
 403                 flush(fswritefd, &sblk);
 404         }
 405         flush(fswritefd, &cgblk);
 406         free(cgblk.b_un.b_buf);
 407         cnt = 0;
 408         TAILQ_FOREACH_REVERSE_SAFE(bp, &bufhead, buflist, b_list, nbp) {
 409                 TAILQ_REMOVE(&bufhead, bp, b_list);
 410                 cnt++;
 411                 flush(fswritefd, bp);
 412                 free(bp->b_un.b_buf);
 413                 free((char *)bp);
 414         }
 415         if (numbufs != cnt)
 416                 errx(EEXIT, "panic: lost %d buffers", numbufs - cnt);
 417         for (cnt = 0; cnt < sblock.fs_ncg; cnt++) {
 418                 if (cgbufs[cnt].b_un.b_cg == NULL)
 419                         continue;
 420                 flush(fswritefd, &cgbufs[cnt]);
 421                 free(cgbufs[cnt].b_un.b_cg);
 422         }
 423         free(cgbufs);
 424         pbp = pdirbp = (struct bufarea *)0;
 425         if (cursnapshot == 0 && sblock.fs_clean != markclean) {
 426                 if ((sblock.fs_clean = markclean) != 0) {
 427                         sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
 428                         sblock.fs_pendingblocks = 0;
 429                         sblock.fs_pendinginodes = 0;
 430                 }
 431                 sbdirty();
 432                 ofsmodified = fsmodified;
 433                 flush(fswritefd, &sblk);
 434                 fsmodified = ofsmodified;
 435                 if (!preen) {
 436                         printf("\n***** FILE SYSTEM MARKED %s *****\n",
 437                             markclean ? "CLEAN" : "DIRTY");
 438                         if (!markclean)
 439                                 rerun = 1;
 440                 }
 441         } else if (!preen) {
 442                 if (markclean) {
 443                         printf("\n***** FILE SYSTEM IS CLEAN *****\n");
 444                 } else {
 445                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 446                         rerun = 1;
 447                 }
 448         }
 449         (void)close(fsreadfd);
 450         (void)close(fswritefd);
 451 }
 452
 453 /*
 454  * Print out I/O statistics.
 455  */
 456 void
 457 IOstats(char *what)
 458 {
 459         int i;
 460
 461         if (debug == 0)
 462                 return;
 463         if (diskreads == 0) {
 464                 printf("%s: no I/O\n\n", what);
 465                 return;
 466         }
 467         if (startpass.tv_sec == 0)
 468                 startpass = startprog;
 469         printf("%s: I/O statistics\n", what);
 470         printIOstats();
 471         totaldiskreads += diskreads;
 472         diskreads = 0;
 473         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 474                 timespecadd(&totalreadtime[i], &readtime[i]);
 475                 totalreadcnt[i] += readcnt[i];
 476                 readtime[i].tv_sec = readtime[i].tv_nsec = 0;
 477                 readcnt[i] = 0;
 478         }
 479         clock_gettime(CLOCK_REALTIME_PRECISE, &startpass);
 480 }
 481
 482 void
 483 finalIOstats(void)
 484 {
 485         int i;
 486
 487         if (debug == 0)
 488                 return;
 489         printf("Final I/O statistics\n");
 490         totaldiskreads += diskreads;
 491         diskreads = totaldiskreads;
 492         startpass = startprog;
 493         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 494                 timespecadd(&totalreadtime[i], &readtime[i]);
 495                 totalreadcnt[i] += readcnt[i];
 496                 readtime[i] = totalreadtime[i];
 497                 readcnt[i] = totalreadcnt[i];
 498         }
 499         printIOstats();
 500 }
 501
 502 static void printIOstats(void)
 503 {
 504         long long msec, totalmsec;
 505         int i;
 506
 507         clock_gettime(CLOCK_REALTIME_PRECISE, &finishpass);
 508         timespecsub(&finishpass, &startpass);
 509         printf("Running time: %jd.%03ld sec\n",
 510                 (intmax_t)finishpass.tv_sec, finishpass.tv_nsec / 1000000);
 511         printf("buffer reads by type:\n");
 512         for (totalmsec = 0, i = 0; i < BT_NUMBUFTYPES; i++)
 513                 totalmsec += readtime[i].tv_sec * 1000 +
 514                     readtime[i].tv_nsec / 1000000;
 515         if (totalmsec == 0)
 516                 totalmsec = 1;
 517         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 518                 if (readcnt[i] == 0)
 519                         continue;
 520                 msec =
 521                     readtime[i].tv_sec * 1000 + readtime[i].tv_nsec / 1000000;
 522                 printf("%21s:%8ld %2ld.%ld%% %4jd.%03ld sec %2lld.%lld%%\n",
 523                     buftype[i], readcnt[i], readcnt[i] * 100 / diskreads,
 524                     (readcnt[i] * 1000 / diskreads) % 10,
 525                     (intmax_t)readtime[i].tv_sec, readtime[i].tv_nsec / 1000000,
 526                     msec * 100 / totalmsec, (msec * 1000 / totalmsec) % 10);
 527         }
 528         printf("\n");
 529 }
 530
 531 int
 532 blread(int fd, char *buf, ufs2_daddr_t blk, long size)
 533 {
 534         char *cp;
 535         int i, errs;
 536         off_t offset;
 537
 538         offset = blk;
 539         offset *= dev_bsize;
 540         if (bkgrdflag)
 541                 slowio_start();
 542         totalreads++;
 543         diskreads++;
 544         if (lseek(fd, offset, 0) < 0)
 545                 rwerror("SEEK BLK", blk);
 546         else if (read(fd, buf, (int)size) == size) {
 547                 if (bkgrdflag)
 548                         slowio_end();
 549                 return (0);
 550         }
 551         rwerror("READ BLK", blk);
 552         if (lseek(fd, offset, 0) < 0)
 553                 rwerror("SEEK BLK", blk);
 554         errs = 0;
 555         memset(buf, 0, (size_t)size);
 556         printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
 557         for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
 558                 if (read(fd, cp, (int)secsize) != secsize) {
 559                         (void)lseek(fd, offset + i + secsize, 0);
 560                         if (secsize != dev_bsize && dev_bsize != 1)
 561                                 printf(" %jd (%jd),",
 562                                     (intmax_t)(blk * dev_bsize + i) / secsize,
 563                                     (intmax_t)blk + i / dev_bsize);
 564                         else
 565                                 printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 566                         errs++;
 567                 }
 568         }
 569         printf("\n");
 570         if (errs)
 571                 resolved = 0;
 572         return (errs);
 573 }
 574
 575 void
 576 blwrite(int fd, char *buf, ufs2_daddr_t blk, long size)
 577 {
 578         int i;
 579         char *cp;
 580         off_t offset;
 581
 582         if (fd < 0)
 583                 return;
 584         offset = blk;
 585         offset *= dev_bsize;
 586         if (lseek(fd, offset, 0) < 0)
 587                 rwerror("SEEK BLK", blk);
 588         else if (write(fd, buf, (int)size) == size) {
 589                 fsmodified = 1;
 590                 return;
 591         }
 592         resolved = 0;
 593         rwerror("WRITE BLK", blk);
 594         if (lseek(fd, offset, 0) < 0)
 595                 rwerror("SEEK BLK", blk);
 596         printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
 597         for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
 598                 if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
 599                         (void)lseek(fd, offset + i + dev_bsize, 0);
 600                         printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 601                 }
 602         printf("\n");
 603         return;
 604 }
 605
 606 void
 607 blerase(int fd, ufs2_daddr_t blk, long size)
 608 {
 609         off_t ioarg[2];
 610
 611         if (fd < 0)
 612                 return;
 613         ioarg[0] = blk * dev_bsize;
 614         ioarg[1] = size;
 615         ioctl(fd, DIOCGDELETE, ioarg);
 616         /* we don't really care if we succeed or not */
 617         return;
 618 }
 619
 620 void
 621 blzero(int fd, ufs2_daddr_t blk, long size)
 622 {
 623         static char *zero;
 624         off_t offset, len;
 625
 626         if (fd < 0)
 627                 return;
 628         len = ZEROBUFSIZE;
 629         if (zero == NULL) {
 630                 zero = calloc(len, 1);
 631                 if (zero == NULL)
 632                         errx(EEXIT, "cannot allocate buffer pool");
 633         }
 634         offset = blk * dev_bsize;
 635         if (lseek(fd, offset, 0) < 0)
 636                 rwerror("SEEK BLK", blk);
 637         while (size > 0) {
 638                 if (size > len)
 639                         size = len;
 640                 else
 641                         len = size;
 642                 if (write(fd, zero, len) != len)
 643                         rwerror("WRITE BLK", blk);
 644                 blk += len / dev_bsize;
 645                 size -= len;
 646         }
 647 }
 648
 649 /*
 650  * Verify cylinder group's magic number and other parameters.  If the
 651  * test fails, offer an option to rebuild the whole cylinder group.
 652  */
 653 int
 654 check_cgmagic(int cg, struct bufarea *cgbp)
 655 {
 656         struct cg *cgp = cgbp->b_un.b_cg;
 657
 658         /*
 659          * Extended cylinder group checks.
 660          */
 661         if (cg_chkmagic(cgp) &&
 662             ((sblock.fs_magic == FS_UFS1_MAGIC &&
 663               cgp->cg_old_niblk == sblock.fs_ipg &&
 664               cgp->cg_ndblk <= sblock.fs_fpg &&
 665               cgp->cg_old_ncyl <= sblock.fs_old_cpg) ||
 666              (sblock.fs_magic == FS_UFS2_MAGIC &&
 667               cgp->cg_niblk == sblock.fs_ipg &&
 668               cgp->cg_ndblk <= sblock.fs_fpg &&
 669               cgp->cg_initediblk <= sblock.fs_ipg))) {
 670                 return (1);
 671         }
 672         pfatal("CYLINDER GROUP %d: BAD MAGIC NUMBER", cg);
 673         if (!reply("REBUILD CYLINDER GROUP")) {
 674                 printf("YOU WILL NEED TO RERUN FSCK.\n");
 675                 rerun = 1;
 676                 return (1);
 677         }
 678         /*
 679          * Zero out the cylinder group and then initialize critical fields.
 680          * Bit maps and summaries will be recalculated by later passes.
 681          */
 682         memset(cgp, 0, (size_t)sblock.fs_cgsize);
 683         cgp->cg_magic = CG_MAGIC;
 684         cgp->cg_cgx = cg;
 685         cgp->cg_niblk = sblock.fs_ipg;
 686         cgp->cg_initediblk = sblock.fs_ipg < 2 * INOPB(&sblock) ?
 687             sblock.fs_ipg : 2 * INOPB(&sblock);
 688         if (cgbase(&sblock, cg) + sblock.fs_fpg < sblock.fs_size)
 689                 cgp->cg_ndblk = sblock.fs_fpg;
 690         else
 691                 cgp->cg_ndblk = sblock.fs_size - cgbase(&sblock, cg);
 692         cgp->cg_iusedoff = &cgp->cg_space[0] - (u_char *)(&cgp->cg_firstfield);
 693         if (sblock.fs_magic == FS_UFS1_MAGIC) {
 694                 cgp->cg_niblk = 0;
 695                 cgp->cg_initediblk = 0;
 696                 cgp->cg_old_ncyl = sblock.fs_old_cpg;
 697                 cgp->cg_old_niblk = sblock.fs_ipg;
 698                 cgp->cg_old_btotoff = cgp->cg_iusedoff;
 699                 cgp->cg_old_boff = cgp->cg_old_btotoff +
 700                     sblock.fs_old_cpg * sizeof(int32_t);
 701                 cgp->cg_iusedoff = cgp->cg_old_boff +
 702                     sblock.fs_old_cpg * sizeof(u_int16_t);
 703         }
 704         cgp->cg_freeoff = cgp->cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
 705         cgp->cg_nextfreeoff = cgp->cg_freeoff + howmany(sblock.fs_fpg,CHAR_BIT);
 706         if (sblock.fs_contigsumsize > 0) {
 707                 cgp->cg_nclusterblks = cgp->cg_ndblk / sblock.fs_frag;
 708                 cgp->cg_clustersumoff =
 709                     roundup(cgp->cg_nextfreeoff, sizeof(u_int32_t));
 710                 cgp->cg_clustersumoff -= sizeof(u_int32_t);
 711                 cgp->cg_clusteroff = cgp->cg_clustersumoff +
 712                     (sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
 713                 cgp->cg_nextfreeoff = cgp->cg_clusteroff +
 714                     howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
 715         }
 716         dirty(cgbp);
 717         return (0);
 718 }
 719
 720 /*
 721  * allocate a data block with the specified number of fragments
 722  */
 723 ufs2_daddr_t
 724 allocblk(long frags)
 725 {
 726         int i, j, k, cg, baseblk;
 727         struct bufarea *cgbp;
 728         struct cg *cgp;
 729
 730         if (frags <= 0 || frags > sblock.fs_frag)
 731                 return (0);
 732         for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
 733                 for (j = 0; j <= sblock.fs_frag - frags; j++) {
 734                         if (testbmap(i + j))
 735                                 continue;
 736                         for (k = 1; k < frags; k++)
 737                                 if (testbmap(i + j + k))
 738                                         break;
 739                         if (k < frags) {
 740                                 j += k;
 741                                 continue;
 742                         }
 743                         cg = dtog(&sblock, i + j);
 744                         cgbp = cgget(cg);
 745                         cgp = cgbp->b_un.b_cg;
 746                         if (!check_cgmagic(cg, cgbp))
 747                                 return (0);
 748                         baseblk = dtogd(&sblock, i + j);
 749                         for (k = 0; k < frags; k++) {
 750                                 setbmap(i + j + k);
 751                                 clrbit(cg_blksfree(cgp), baseblk + k);
 752                         }
 753                         n_blks += frags;
 754                         if (frags == sblock.fs_frag)
 755                                 cgp->cg_cs.cs_nbfree--;
 756                         else
 757                                 cgp->cg_cs.cs_nffree -= frags;
 758                         dirty(cgbp);
 759                         return (i + j);
 760                 }
 761         }
 762         return (0);
 763 }
 764
 765 /*
 766  * Free a previously allocated block
 767  */
 768 void
 769 freeblk(ufs2_daddr_t blkno, long frags)
 770 {
 771         struct inodesc idesc;
 772
 773         idesc.id_blkno = blkno;
 774         idesc.id_numfrags = frags;
 775         (void)pass4check(&idesc);
 776 }
 777
 778 /* Slow down IO so as to leave some disk bandwidth for other processes */
 779 void
 780 slowio_start()
 781 {
 782
 783         /* Delay one in every 8 operations */
 784         slowio_pollcnt = (slowio_pollcnt + 1) & 7;
 785         if (slowio_pollcnt == 0) {
 786                 gettimeofday(&slowio_starttime, NULL);
 787         }
 788 }
 789
 790 void
 791 slowio_end()
 792 {
 793         struct timeval tv;
 794         int delay_usec;
 795
 796         if (slowio_pollcnt != 0)
 797                 return;
 798
 799         /* Update the slowdown interval. */
 800         gettimeofday(&tv, NULL);
 801         delay_usec = (tv.tv_sec - slowio_starttime.tv_sec) * 1000000 +
 802             (tv.tv_usec - slowio_starttime.tv_usec);
 803         if (delay_usec < 64)
 804                 delay_usec = 64;
 805         if (delay_usec > 2500000)
 806                 delay_usec = 2500000;
 807         slowio_delay_usec = (slowio_delay_usec * 63 + delay_usec) >> 6;
 808         /* delay by 8 times the average IO delay */
 809         if (slowio_delay_usec > 64)
 810                 usleep(slowio_delay_usec * 8);
 811 }
 812
 813 /*
 814  * Find a pathname
 815  */
 816 void
 817 getpathname(char *namebuf, ino_t curdir, ino_t ino)
 818 {
 819         int len;
 820         char *cp;
 821         struct inodesc idesc;
 822         static int busy = 0;
 823
 824         if (curdir == ino && ino == ROOTINO) {
 825                 (void)strcpy(namebuf, "/");
 826                 return;
 827         }
 828         if (busy || !INO_IS_DVALID(curdir)) {
 829                 (void)strcpy(namebuf, "?");
 830                 return;
 831         }
 832         busy = 1;
 833         memset(&idesc, 0, sizeof(struct inodesc));
 834         idesc.id_type = DATA;
 835         idesc.id_fix = IGNORE;
 836         cp = &namebuf[MAXPATHLEN - 1];
 837         *cp = '\0';
 838         if (curdir != ino) {
 839                 idesc.id_parent = curdir;
 840                 goto namelookup;
 841         }
 842         while (ino != ROOTINO) {
 843                 idesc.id_number = ino;
 844                 idesc.id_func = findino;
 845                 idesc.id_name = strdup("..");
 846                 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
 847                         break;
 848         namelookup:
 849                 idesc.id_number = idesc.id_parent;
 850                 idesc.id_parent = ino;
 851                 idesc.id_func = findname;
 852                 idesc.id_name = namebuf;
 853                 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
 854                         break;
 855                 len = strlen(namebuf);
 856                 cp -= len;
 857                 memmove(cp, namebuf, (size_t)len);
 858                 *--cp = '/';
 859                 if (cp < &namebuf[MAXNAMLEN])
 860                         break;
 861                 ino = idesc.id_number;
 862         }
 863         busy = 0;
 864         if (ino != ROOTINO)
 865                 *--cp = '?';
 866         memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
 867 }
 868
 869 void
 870 catch(int sig __unused)
 871 {
 872
 873         ckfini(0);
 874         exit(12);
 875 }
 876
 877 /*
 878  * When preening, allow a single quit to signal
 879  * a special exit after file system checks complete
 880  * so that reboot sequence may be interrupted.
 881  */
 882 void
 883 catchquit(int sig __unused)
 884 {
 885         printf("returning to single-user after file system check\n");
 886         returntosingle = 1;
 887         (void)signal(SIGQUIT, SIG_DFL);
 888 }
 889
 890 /*
 891  * determine whether an inode should be fixed.
 892  */
 893 int
 894 dofix(struct inodesc *idesc, const char *msg)
 895 {
 896
 897         switch (idesc->id_fix) {
 898
 899         case DONTKNOW:
 900                 if (idesc->id_type == DATA)
 901                         direrror(idesc->id_number, msg);
 902                 else
 903                         pwarn("%s", msg);
 904                 if (preen) {
 905                         printf(" (SALVAGED)\n");
 906                         idesc->id_fix = FIX;
 907                         return (ALTERED);
 908                 }
 909                 if (reply("SALVAGE") == 0) {
 910                         idesc->id_fix = NOFIX;
 911                         return (0);
 912                 }
 913                 idesc->id_fix = FIX;
 914                 return (ALTERED);
 915
 916         case FIX:
 917                 return (ALTERED);
 918
 919         case NOFIX:
 920         case IGNORE:
 921                 return (0);
 922
 923         default:
 924                 errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
 925         }
 926         /* NOTREACHED */
 927         return (0);
 928 }
 929
 930 #include <stdarg.h>
 931
 932 /*
 933  * An unexpected inconsistency occured.
 934  * Die if preening or file system is running with soft dependency protocol,
 935  * otherwise just print message and continue.
 936  */
 937 void
 938 pfatal(const char *fmt, ...)
 939 {
 940         va_list ap;
 941         va_start(ap, fmt);
 942         if (!preen) {
 943                 (void)vfprintf(stdout, fmt, ap);
 944                 va_end(ap);
 945                 if (usedsoftdep)
 946                         (void)fprintf(stdout,
 947                             "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
 948                 /*
 949                  * Force foreground fsck to clean up inconsistency.
 950                  */
 951                 if (bkgrdflag) {
 952                         cmd.value = FS_NEEDSFSCK;
 953                         cmd.size = 1;
 954                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 955                             &cmd, sizeof cmd) == -1)
 956                                 pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
 957                         fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
 958                         ckfini(0);
 959                         exit(EEXIT);
 960                 }
 961                 return;
 962         }
 963         if (cdevname == NULL)
 964                 cdevname = strdup("fsck");
 965         (void)fprintf(stdout, "%s: ", cdevname);
 966         (void)vfprintf(stdout, fmt, ap);
 967         (void)fprintf(stdout,
 968             "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
 969             cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
 970         /*
 971          * Force foreground fsck to clean up inconsistency.
 972          */
 973         if (bkgrdflag) {
 974                 cmd.value = FS_NEEDSFSCK;
 975                 cmd.size = 1;
 976                 if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 977                     &cmd, sizeof cmd) == -1)
 978                         pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
 979         }
 980         ckfini(0);
 981         exit(EEXIT);
 982 }
 983
 984 /*
 985  * Pwarn just prints a message when not preening or running soft dependency
 986  * protocol, or a warning (preceded by filename) when preening.
 987  */
 988 void
 989 pwarn(const char *fmt, ...)
 990 {
 991         va_list ap;
 992         va_start(ap, fmt);
 993         if (preen)
 994                 (void)fprintf(stdout, "%s: ", cdevname);
 995         (void)vfprintf(stdout, fmt, ap);
 996         va_end(ap);
 997 }
 998
 999 /*
1000  * Stub for routines from kernel.
1001  */
1002 void
1003 panic(const char *fmt, ...)
1004 {
1005         va_list ap;
1006         va_start(ap, fmt);
1007         pfatal("INTERNAL INCONSISTENCY:");
1008         (void)vfprintf(stdout, fmt, ap);
1009         va_end(ap);
1010         exit(EEXIT);
1011 }