sbin/fsck_ffs/fsutil.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 sccsid[] = "@(#)utilities.c   8.6 (Berkeley) 5/19/95";
  35 #endif /* not lint */
  36 #endif
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/param.h>
  41 #include <sys/time.h>
  42 #include <sys/types.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/disk.h>
  45 #include <sys/disklabel.h>
  46 #include <sys/ioctl.h>
  47 #include <sys/stat.h>
  48
  49 #include <ufs/ufs/dinode.h>
  50 #include <ufs/ufs/dir.h>
  51 #include <ufs/ffs/fs.h>
  52
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <string.h>
  56 #include <ctype.h>
  57 #include <fstab.h>
  58 #include <stdint.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63 #include <libufs.h>
  64
  65 #include "fsck.h"
  66
  67 static void slowio_start(void);
  68 static void slowio_end(void);
  69 static void printIOstats(void);
  70
  71 static long diskreads, totaldiskreads, totalreads; /* Disk cache statistics */
  72 static struct timespec startpass, finishpass;
  73 struct timeval slowio_starttime;
  74 int slowio_delay_usec = 10000;  /* Initial IO delay for background fsck */
  75 int slowio_pollcnt;
  76 static struct bufarea cgblk;    /* backup buffer for cylinder group blocks */
  77 static TAILQ_HEAD(buflist, bufarea) bufhead;    /* head of buffer cache list */
  78 static int numbufs;                             /* size of buffer cache */
  79 static char *buftype[BT_NUMBUFTYPES] = BT_NAMES;
  80 static struct bufarea *cgbufs;  /* header for cylinder group cache */
  81 static int flushtries;          /* number of tries to reclaim memory */
  82
  83 void
  84 fsutilinit(void)
  85 {
  86         diskreads = totaldiskreads = totalreads = 0;
  87         bzero(&startpass, sizeof(struct timespec));
  88         bzero(&finishpass, sizeof(struct timespec));
  89         bzero(&slowio_starttime, sizeof(struct timeval));
  90         slowio_delay_usec = 10000;
  91         slowio_pollcnt = 0;
  92         bzero(&cgblk, sizeof(struct bufarea));
  93         TAILQ_INIT(&bufhead);
  94         numbufs = 0;
  95         /* buftype ? */
  96         cgbufs = NULL;
  97         flushtries = 0;
  98 }
  99
 100 int
 101 ftypeok(union dinode *dp)
 102 {
 103         switch (DIP(dp, di_mode) & IFMT) {
 104
 105         case IFDIR:
 106         case IFREG:
 107         case IFBLK:
 108         case IFCHR:
 109         case IFLNK:
 110         case IFSOCK:
 111         case IFIFO:
 112                 return (1);
 113
 114         default:
 115                 if (debug)
 116                         printf("bad file type 0%o\n", DIP(dp, di_mode));
 117                 return (0);
 118         }
 119 }
 120
 121 int
 122 reply(const char *question)
 123 {
 124         int persevere;
 125         char c;
 126
 127         if (preen)
 128                 pfatal("INTERNAL ERROR: GOT TO reply()");
 129         persevere = !strcmp(question, "CONTINUE");
 130         printf("\n");
 131         if (!persevere && (nflag || (fswritefd < 0 && bkgrdflag == 0))) {
 132                 printf("%s? no\n\n", question);
 133                 resolved = 0;
 134                 return (0);
 135         }
 136         if (yflag || (persevere && nflag)) {
 137                 printf("%s? yes\n\n", question);
 138                 return (1);
 139         }
 140         do      {
 141                 printf("%s? [yn] ", question);
 142                 (void) fflush(stdout);
 143                 c = getc(stdin);
 144                 while (c != '\n' && getc(stdin) != '\n') {
 145                         if (feof(stdin)) {
 146                                 resolved = 0;
 147                                 return (0);
 148                         }
 149                 }
 150         } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
 151         printf("\n");
 152         if (c == 'y' || c == 'Y')
 153                 return (1);
 154         resolved = 0;
 155         return (0);
 156 }
 157
 158 /*
 159  * Look up state information for an inode.
 160  */
 161 struct inostat *
 162 inoinfo(ino_t inum)
 163 {
 164         static struct inostat unallocated = { USTATE, 0, 0 };
 165         struct inostatlist *ilp;
 166         int iloff;
 167
 168         if (inum > maxino)
 169                 errx(EEXIT, "inoinfo: inumber %ju out of range",
 170                     (uintmax_t)inum);
 171         ilp = &inostathead[inum / sblock.fs_ipg];
 172         iloff = inum % sblock.fs_ipg;
 173         if (iloff >= ilp->il_numalloced)
 174                 return (&unallocated);
 175         return (&ilp->il_stat[iloff]);
 176 }
 177
 178 /*
 179  * Malloc buffers and set up cache.
 180  */
 181 void
 182 bufinit(void)
 183 {
 184         struct bufarea *bp;
 185         long bufcnt, i;
 186         char *bufp;
 187
 188         pbp = pdirbp = (struct bufarea *)0;
 189         bufp = Malloc((unsigned int)sblock.fs_bsize);
 190         if (bufp == NULL)
 191                 errx(EEXIT, "cannot allocate buffer pool");
 192         cgblk.b_un.b_buf = bufp;
 193         initbarea(&cgblk, BT_CYLGRP);
 194         TAILQ_INIT(&bufhead);
 195         bufcnt = MAXBUFS;
 196         if (bufcnt < MINBUFS)
 197                 bufcnt = MINBUFS;
 198         for (i = 0; i < bufcnt; i++) {
 199                 bp = (struct bufarea *)Malloc(sizeof(struct bufarea));
 200                 bufp = Malloc((unsigned int)sblock.fs_bsize);
 201                 if (bp == NULL || bufp == NULL) {
 202                         if (i >= MINBUFS)
 203                                 break;
 204                         errx(EEXIT, "cannot allocate buffer pool");
 205                 }
 206                 bp->b_un.b_buf = bufp;
 207                 TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 208                 initbarea(bp, BT_UNKNOWN);
 209         }
 210         numbufs = i;    /* save number of buffers */
 211         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 212                 readtime[i].tv_sec = totalreadtime[i].tv_sec = 0;
 213                 readtime[i].tv_nsec = totalreadtime[i].tv_nsec = 0;
 214                 readcnt[i] = totalreadcnt[i] = 0;
 215         }
 216 }
 217
 218 /*
 219  * Manage cylinder group buffers.
 220  *
 221  * Use getblk() here rather than cgget() because the cylinder group
 222  * may be corrupted but we want it anyway so we can fix it.
 223  */
 224 static struct bufarea *cgbufs;  /* header for cylinder group cache */
 225 static int flushtries;          /* number of tries to reclaim memory */
 226
 227 struct bufarea *
 228 cglookup(int cg)
 229 {
 230         struct bufarea *cgbp;
 231         struct cg *cgp;
 232
 233         if (cgbufs == NULL) {
 234                 cgbufs = calloc(sblock.fs_ncg, sizeof(struct bufarea));
 235                 if (cgbufs == NULL)
 236                         errx(EEXIT, "cannot allocate cylinder group buffers");
 237         }
 238         cgbp = &cgbufs[cg];
 239         if (cgbp->b_un.b_cg != NULL)
 240                 return (cgbp);
 241         cgp = NULL;
 242         if (flushtries == 0)
 243                 cgp = malloc((unsigned int)sblock.fs_cgsize);
 244         if (cgp == NULL) {
 245                 getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
 246                 return (&cgblk);
 247         }
 248         cgbp->b_un.b_cg = cgp;
 249         initbarea(cgbp, BT_CYLGRP);
 250         getblk(cgbp, cgtod(&sblock, cg), sblock.fs_cgsize);
 251         return (cgbp);
 252 }
 253
 254 /*
 255  * Mark a cylinder group buffer as dirty.
 256  * Update its check-hash if they are enabled.
 257  */
 258 void
 259 cgdirty(struct bufarea *cgbp)
 260 {
 261         struct cg *cg;
 262
 263         cg = cgbp->b_un.b_cg;
 264         if ((sblock.fs_metackhash & CK_CYLGRP) != 0) {
 265                 cg->cg_ckhash = 0;
 266                 cg->cg_ckhash =
 267                     calculate_crc32c(~0L, (void *)cg, sblock.fs_cgsize);
 268         }
 269         dirty(cgbp);
 270 }
 271
 272 /*
 273  * Attempt to flush a cylinder group cache entry.
 274  * Return whether the flush was successful.
 275  */
 276 int
 277 flushentry(void)
 278 {
 279         struct bufarea *cgbp;
 280
 281         if (flushtries == sblock.fs_ncg || cgbufs == NULL)
 282                 return (0);
 283         cgbp = &cgbufs[flushtries++];
 284         if (cgbp->b_un.b_cg == NULL)
 285                 return (0);
 286         flush(fswritefd, cgbp);
 287         free(cgbp->b_un.b_buf);
 288         cgbp->b_un.b_buf = NULL;
 289         return (1);
 290 }
 291
 292 /*
 293  * Manage a cache of directory blocks.
 294  */
 295 struct bufarea *
 296 getdatablk(ufs2_daddr_t blkno, long size, int type)
 297 {
 298         struct bufarea *bp;
 299
 300         TAILQ_FOREACH(bp, &bufhead, b_list)
 301                 if (bp->b_bno == fsbtodb(&sblock, blkno))
 302                         goto foundit;
 303         TAILQ_FOREACH_REVERSE(bp, &bufhead, buflist, b_list)
 304                 if ((bp->b_flags & B_INUSE) == 0)
 305                         break;
 306         if (bp == NULL)
 307                 errx(EEXIT, "deadlocked buffer pool");
 308         bp->b_type = type;
 309         getblk(bp, blkno, size);
 310         /* fall through */
 311 foundit:
 312         if (debug && bp->b_type != type)
 313                 printf("Buffer type changed from %s to %s\n",
 314                     buftype[bp->b_type], buftype[type]);
 315         TAILQ_REMOVE(&bufhead, bp, b_list);
 316         TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 317         bp->b_flags |= B_INUSE;
 318         return (bp);
 319 }
 320
 321 void
 322 getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
 323 {
 324         ufs2_daddr_t dblk;
 325         struct timespec start, finish;
 326
 327         dblk = fsbtodb(&sblock, blk);
 328         if (bp->b_bno == dblk) {
 329                 totalreads++;
 330         } else {
 331                 flush(fswritefd, bp);
 332                 if (debug) {
 333                         readcnt[bp->b_type]++;
 334                         clock_gettime(CLOCK_REALTIME_PRECISE, &start);
 335                 }
 336                 bp->b_errs = blread(fsreadfd, bp->b_un.b_buf, dblk, size);
 337                 if (debug) {
 338                         clock_gettime(CLOCK_REALTIME_PRECISE, &finish);
 339                         timespecsub(&finish, &start, &finish);
 340                         timespecadd(&readtime[bp->b_type], &finish,
 341                             &readtime[bp->b_type]);
 342                 }
 343                 bp->b_bno = dblk;
 344                 bp->b_size = size;
 345         }
 346 }
 347
 348 void
 349 flush(int fd, struct bufarea *bp)
 350 {
 351
 352         if (!bp->b_dirty)
 353                 return;
 354         bp->b_dirty = 0;
 355         if (fswritefd < 0) {
 356                 pfatal("WRITING IN READ_ONLY MODE.\n");
 357                 return;
 358         }
 359         if (bp->b_errs != 0)
 360                 pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
 361                     (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
 362                     (long long)bp->b_bno);
 363         bp->b_errs = 0;
 364         /*
 365          * Write using the appropriate function.
 366          */
 367         switch (bp->b_type) {
 368         case BT_SUPERBLK:
 369                 if (bp != &sblk)
 370                         pfatal("BUFFER %p DOES NOT MATCH SBLK %p\n",
 371                             bp, &sblk);
 372                 if (sbput(fd, bp->b_un.b_fs, 0) == 0)
 373                         fsmodified = 1;
 374                 break;
 375         case BT_CYLGRP:
 376                 if (cgput(fswritefd, &sblock, bp->b_un.b_cg) == 0)
 377                         fsmodified = 1;
 378                 break;
 379         default:
 380                 blwrite(fd, bp->b_un.b_buf, bp->b_bno, bp->b_size);
 381                 break;
 382         }
 383 }
 384
 385 void
 386 rwerror(const char *mesg, ufs2_daddr_t blk)
 387 {
 388
 389         if (bkgrdcheck)
 390                 exit(EEXIT);
 391         if (preen == 0)
 392                 printf("\n");
 393         pfatal("CANNOT %s: %ld", mesg, (long)blk);
 394         if (reply("CONTINUE") == 0)
 395                 exit(EEXIT);
 396 }
 397
 398 void
 399 ckfini(int markclean)
 400 {
 401         struct bufarea *bp, *nbp;
 402         int ofsmodified, cnt;
 403
 404         if (bkgrdflag) {
 405                 unlink(snapname);
 406                 if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
 407                         cmd.value = FS_UNCLEAN;
 408                         cmd.size = markclean ? -1 : 1;
 409                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 410                             &cmd, sizeof cmd) == -1)
 411                                 rwerror("SET FILE SYSTEM FLAGS", FS_UNCLEAN);
 412                         if (!preen) {
 413                                 printf("\n***** FILE SYSTEM MARKED %s *****\n",
 414                                     markclean ? "CLEAN" : "DIRTY");
 415                                 if (!markclean)
 416                                         rerun = 1;
 417                         }
 418                 } else if (!preen && !markclean) {
 419                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 420                         rerun = 1;
 421                 }
 422         }
 423         if (debug && totalreads > 0)
 424                 printf("cache with %d buffers missed %ld of %ld (%d%%)\n",
 425                     numbufs, totaldiskreads, totalreads,
 426                     (int)(totaldiskreads * 100 / totalreads));
 427         if (fswritefd < 0) {
 428                 (void)close(fsreadfd);
 429                 return;
 430         }
 431         flush(fswritefd, &sblk);
 432         if (havesb && cursnapshot == 0 && sblock.fs_magic == FS_UFS2_MAGIC &&
 433             sblk.b_bno != sblock.fs_sblockloc / dev_bsize &&
 434             !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
 435                 /* Change the write destination to standard superblock */
 436                 sblock.fs_sblockactualloc = sblock.fs_sblockloc;
 437                 sblk.b_bno = sblock.fs_sblockloc / dev_bsize;
 438                 sbdirty();
 439                 flush(fswritefd, &sblk);
 440         }
 441         flush(fswritefd, &cgblk);
 442         free(cgblk.b_un.b_buf);
 443         cnt = 0;
 444         TAILQ_FOREACH_REVERSE_SAFE(bp, &bufhead, buflist, b_list, nbp) {
 445                 TAILQ_REMOVE(&bufhead, bp, b_list);
 446                 cnt++;
 447                 flush(fswritefd, bp);
 448                 free(bp->b_un.b_buf);
 449                 free((char *)bp);
 450         }
 451         if (numbufs != cnt)
 452                 errx(EEXIT, "panic: lost %d buffers", numbufs - cnt);
 453         if (cgbufs != NULL) {
 454                 for (cnt = 0; cnt < sblock.fs_ncg; cnt++) {
 455                         if (cgbufs[cnt].b_un.b_cg == NULL)
 456                                 continue;
 457                         flush(fswritefd, &cgbufs[cnt]);
 458                         free(cgbufs[cnt].b_un.b_cg);
 459                 }
 460                 free(cgbufs);
 461         }
 462         pbp = pdirbp = (struct bufarea *)0;
 463         if (cursnapshot == 0 && sblock.fs_clean != markclean) {
 464                 if ((sblock.fs_clean = markclean) != 0) {
 465                         sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
 466                         sblock.fs_pendingblocks = 0;
 467                         sblock.fs_pendinginodes = 0;
 468                 }
 469                 sbdirty();
 470                 ofsmodified = fsmodified;
 471                 flush(fswritefd, &sblk);
 472                 fsmodified = ofsmodified;
 473                 if (!preen) {
 474                         printf("\n***** FILE SYSTEM MARKED %s *****\n",
 475                             markclean ? "CLEAN" : "DIRTY");
 476                         if (!markclean)
 477                                 rerun = 1;
 478                 }
 479         } else if (!preen) {
 480                 if (markclean) {
 481                         printf("\n***** FILE SYSTEM IS CLEAN *****\n");
 482                 } else {
 483                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 484                         rerun = 1;
 485                 }
 486         }
 487         (void)close(fsreadfd);
 488         (void)close(fswritefd);
 489 }
 490
 491 /*
 492  * Print out I/O statistics.
 493  */
 494 void
 495 IOstats(char *what)
 496 {
 497         int i;
 498
 499         if (debug == 0)
 500                 return;
 501         if (diskreads == 0) {
 502                 printf("%s: no I/O\n\n", what);
 503                 return;
 504         }
 505         if (startpass.tv_sec == 0)
 506                 startpass = startprog;
 507         printf("%s: I/O statistics\n", what);
 508         printIOstats();
 509         totaldiskreads += diskreads;
 510         diskreads = 0;
 511         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 512                 timespecadd(&totalreadtime[i], &readtime[i], &totalreadtime[i]);
 513                 totalreadcnt[i] += readcnt[i];
 514                 readtime[i].tv_sec = readtime[i].tv_nsec = 0;
 515                 readcnt[i] = 0;
 516         }
 517         clock_gettime(CLOCK_REALTIME_PRECISE, &startpass);
 518 }
 519
 520 void
 521 finalIOstats(void)
 522 {
 523         int i;
 524
 525         if (debug == 0)
 526                 return;
 527         printf("Final I/O statistics\n");
 528         totaldiskreads += diskreads;
 529         diskreads = totaldiskreads;
 530         startpass = startprog;
 531         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 532                 timespecadd(&totalreadtime[i], &readtime[i], &totalreadtime[i]);
 533                 totalreadcnt[i] += readcnt[i];
 534                 readtime[i] = totalreadtime[i];
 535                 readcnt[i] = totalreadcnt[i];
 536         }
 537         printIOstats();
 538 }
 539
 540 static void printIOstats(void)
 541 {
 542         long long msec, totalmsec;
 543         int i;
 544
 545         clock_gettime(CLOCK_REALTIME_PRECISE, &finishpass);
 546         timespecsub(&finishpass, &startpass, &finishpass);
 547         printf("Running time: %jd.%03ld sec\n",
 548                 (intmax_t)finishpass.tv_sec, finishpass.tv_nsec / 1000000);
 549         printf("buffer reads by type:\n");
 550         for (totalmsec = 0, i = 0; i < BT_NUMBUFTYPES; i++)
 551                 totalmsec += readtime[i].tv_sec * 1000 +
 552                     readtime[i].tv_nsec / 1000000;
 553         if (totalmsec == 0)
 554                 totalmsec = 1;
 555         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 556                 if (readcnt[i] == 0)
 557                         continue;
 558                 msec =
 559                     readtime[i].tv_sec * 1000 + readtime[i].tv_nsec / 1000000;
 560                 printf("%21s:%8ld %2ld.%ld%% %4jd.%03ld sec %2lld.%lld%%\n",
 561                     buftype[i], readcnt[i], readcnt[i] * 100 / diskreads,
 562                     (readcnt[i] * 1000 / diskreads) % 10,
 563                     (intmax_t)readtime[i].tv_sec, readtime[i].tv_nsec / 1000000,
 564                     msec * 100 / totalmsec, (msec * 1000 / totalmsec) % 10);
 565         }
 566         printf("\n");
 567 }
 568
 569 int
 570 blread(int fd, char *buf, ufs2_daddr_t blk, long size)
 571 {
 572         char *cp;
 573         int i, errs;
 574         off_t offset;
 575
 576         offset = blk;
 577         offset *= dev_bsize;
 578         if (bkgrdflag)
 579                 slowio_start();
 580         totalreads++;
 581         diskreads++;
 582         if (pread(fd, buf, (int)size, offset) == size) {
 583                 if (bkgrdflag)
 584                         slowio_end();
 585                 return (0);
 586         }
 587
 588         /*
 589          * This is handled specially here instead of in rwerror because
 590          * rwerror is used for all sorts of errors, not just true read/write
 591          * errors.  It should be refactored and fixed.
 592          */
 593         if (surrender) {
 594                 pfatal("CANNOT READ_BLK: %ld", (long)blk);
 595                 errx(EEXIT, "ABORTING DUE TO READ ERRORS");
 596         } else
 597                 rwerror("READ BLK", blk);
 598
 599         errs = 0;
 600         memset(buf, 0, (size_t)size);
 601         printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
 602         for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
 603                 if (pread(fd, cp, (int)secsize, offset + i) != secsize) {
 604                         if (secsize != dev_bsize && dev_bsize != 1)
 605                                 printf(" %jd (%jd),",
 606                                     (intmax_t)(blk * dev_bsize + i) / secsize,
 607                                     (intmax_t)blk + i / dev_bsize);
 608                         else
 609                                 printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 610                         errs++;
 611                 }
 612         }
 613         printf("\n");
 614         if (errs)
 615                 resolved = 0;
 616         return (errs);
 617 }
 618
 619 void
 620 blwrite(int fd, char *buf, ufs2_daddr_t blk, ssize_t size)
 621 {
 622         int i;
 623         char *cp;
 624         off_t offset;
 625
 626         if (fd < 0)
 627                 return;
 628         offset = blk;
 629         offset *= dev_bsize;
 630         if (pwrite(fd, buf, size, offset) == size) {
 631                 fsmodified = 1;
 632                 return;
 633         }
 634         resolved = 0;
 635         rwerror("WRITE BLK", blk);
 636         printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
 637         for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
 638                 if (pwrite(fd, cp, dev_bsize, offset + i) != dev_bsize)
 639                         printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 640         printf("\n");
 641         return;
 642 }
 643
 644 void
 645 blerase(int fd, ufs2_daddr_t blk, long size)
 646 {
 647         off_t ioarg[2];
 648
 649         if (fd < 0)
 650                 return;
 651         ioarg[0] = blk * dev_bsize;
 652         ioarg[1] = size;
 653         ioctl(fd, DIOCGDELETE, ioarg);
 654         /* we don't really care if we succeed or not */
 655         return;
 656 }
 657
 658 /*
 659  * Fill a contiguous region with all-zeroes.  Note ZEROBUFSIZE is by
 660  * definition a multiple of dev_bsize.
 661  */
 662 void
 663 blzero(int fd, ufs2_daddr_t blk, long size)
 664 {
 665         static char *zero;
 666         off_t offset, len;
 667
 668         if (fd < 0)
 669                 return;
 670         if (zero == NULL) {
 671                 zero = calloc(ZEROBUFSIZE, 1);
 672                 if (zero == NULL)
 673                         errx(EEXIT, "cannot allocate buffer pool");
 674         }
 675         offset = blk * dev_bsize;
 676         if (lseek(fd, offset, 0) < 0)
 677                 rwerror("SEEK BLK", blk);
 678         while (size > 0) {
 679                 len = MIN(ZEROBUFSIZE, size);
 680                 if (write(fd, zero, len) != len)
 681                         rwerror("WRITE BLK", blk);
 682                 blk += len / dev_bsize;
 683                 size -= len;
 684         }
 685 }
 686
 687 /*
 688  * Verify cylinder group's magic number and other parameters.  If the
 689  * test fails, offer an option to rebuild the whole cylinder group.
 690  */
 691 int
 692 check_cgmagic(int cg, struct bufarea *cgbp)
 693 {
 694         struct cg *cgp = cgbp->b_un.b_cg;
 695
 696         /*
 697          * Extended cylinder group checks.
 698          */
 699         if (cg_chkmagic(cgp) &&
 700             ((sblock.fs_magic == FS_UFS1_MAGIC &&
 701               cgp->cg_old_niblk == sblock.fs_ipg &&
 702               cgp->cg_ndblk <= sblock.fs_fpg &&
 703               cgp->cg_old_ncyl <= sblock.fs_old_cpg) ||
 704              (sblock.fs_magic == FS_UFS2_MAGIC &&
 705               cgp->cg_niblk == sblock.fs_ipg &&
 706               cgp->cg_ndblk <= sblock.fs_fpg &&
 707               cgp->cg_initediblk <= sblock.fs_ipg))) {
 708                 return (1);
 709         }
 710         pfatal("CYLINDER GROUP %d: BAD MAGIC NUMBER", cg);
 711         if (!reply("REBUILD CYLINDER GROUP")) {
 712                 printf("YOU WILL NEED TO RERUN FSCK.\n");
 713                 rerun = 1;
 714                 return (1);
 715         }
 716         /*
 717          * Zero out the cylinder group and then initialize critical fields.
 718          * Bit maps and summaries will be recalculated by later passes.
 719          */
 720         memset(cgp, 0, (size_t)sblock.fs_cgsize);
 721         cgp->cg_magic = CG_MAGIC;
 722         cgp->cg_cgx = cg;
 723         cgp->cg_niblk = sblock.fs_ipg;
 724         cgp->cg_initediblk = MIN(sblock.fs_ipg, 2 * INOPB(&sblock));
 725         if (cgbase(&sblock, cg) + sblock.fs_fpg < sblock.fs_size)
 726                 cgp->cg_ndblk = sblock.fs_fpg;
 727         else
 728                 cgp->cg_ndblk = sblock.fs_size - cgbase(&sblock, cg);
 729         cgp->cg_iusedoff = &cgp->cg_space[0] - (u_char *)(&cgp->cg_firstfield);
 730         if (sblock.fs_magic == FS_UFS1_MAGIC) {
 731                 cgp->cg_niblk = 0;
 732                 cgp->cg_initediblk = 0;
 733                 cgp->cg_old_ncyl = sblock.fs_old_cpg;
 734                 cgp->cg_old_niblk = sblock.fs_ipg;
 735                 cgp->cg_old_btotoff = cgp->cg_iusedoff;
 736                 cgp->cg_old_boff = cgp->cg_old_btotoff +
 737                     sblock.fs_old_cpg * sizeof(int32_t);
 738                 cgp->cg_iusedoff = cgp->cg_old_boff +
 739                     sblock.fs_old_cpg * sizeof(u_int16_t);
 740         }
 741         cgp->cg_freeoff = cgp->cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
 742         cgp->cg_nextfreeoff = cgp->cg_freeoff + howmany(sblock.fs_fpg,CHAR_BIT);
 743         if (sblock.fs_contigsumsize > 0) {
 744                 cgp->cg_nclusterblks = cgp->cg_ndblk / sblock.fs_frag;
 745                 cgp->cg_clustersumoff =
 746                     roundup(cgp->cg_nextfreeoff, sizeof(u_int32_t));
 747                 cgp->cg_clustersumoff -= sizeof(u_int32_t);
 748                 cgp->cg_clusteroff = cgp->cg_clustersumoff +
 749                     (sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
 750                 cgp->cg_nextfreeoff = cgp->cg_clusteroff +
 751                     howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
 752         }
 753         cgdirty(cgbp);
 754         return (0);
 755 }
 756
 757 /*
 758  * allocate a data block with the specified number of fragments
 759  */
 760 ufs2_daddr_t
 761 allocblk(long frags)
 762 {
 763         int i, j, k, cg, baseblk;
 764         struct bufarea *cgbp;
 765         struct cg *cgp;
 766
 767         if (frags <= 0 || frags > sblock.fs_frag)
 768                 return (0);
 769         for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
 770                 for (j = 0; j <= sblock.fs_frag - frags; j++) {
 771                         if (testbmap(i + j))
 772                                 continue;
 773                         for (k = 1; k < frags; k++)
 774                                 if (testbmap(i + j + k))
 775                                         break;
 776                         if (k < frags) {
 777                                 j += k;
 778                                 continue;
 779                         }
 780                         cg = dtog(&sblock, i + j);
 781                         cgbp = cglookup(cg);
 782                         cgp = cgbp->b_un.b_cg;
 783                         if (!check_cgmagic(cg, cgbp))
 784                                 return (0);
 785                         baseblk = dtogd(&sblock, i + j);
 786                         for (k = 0; k < frags; k++) {
 787                                 setbmap(i + j + k);
 788                                 clrbit(cg_blksfree(cgp), baseblk + k);
 789                         }
 790                         n_blks += frags;
 791                         if (frags == sblock.fs_frag)
 792                                 cgp->cg_cs.cs_nbfree--;
 793                         else
 794                                 cgp->cg_cs.cs_nffree -= frags;
 795                         cgdirty(cgbp);
 796                         return (i + j);
 797                 }
 798         }
 799         return (0);
 800 }
 801
 802 /*
 803  * Slow down IO so as to leave some disk bandwidth for other processes
 804  */
 805 void
 806 slowio_start()
 807 {
 808
 809         /* Delay one in every 8 operations */
 810         slowio_pollcnt = (slowio_pollcnt + 1) & 7;
 811         if (slowio_pollcnt == 0) {
 812                 gettimeofday(&slowio_starttime, NULL);
 813         }
 814 }
 815
 816 void
 817 slowio_end()
 818 {
 819         struct timeval tv;
 820         int delay_usec;
 821
 822         if (slowio_pollcnt != 0)
 823                 return;
 824
 825         /* Update the slowdown interval. */
 826         gettimeofday(&tv, NULL);
 827         delay_usec = (tv.tv_sec - slowio_starttime.tv_sec) * 1000000 +
 828             (tv.tv_usec - slowio_starttime.tv_usec);
 829         if (delay_usec < 64)
 830                 delay_usec = 64;
 831         if (delay_usec > 2500000)
 832                 delay_usec = 2500000;
 833         slowio_delay_usec = (slowio_delay_usec * 63 + delay_usec) >> 6;
 834         /* delay by 8 times the average IO delay */
 835         if (slowio_delay_usec > 64)
 836                 usleep(slowio_delay_usec * 8);
 837 }
 838
 839 /*
 840  * Find a pathname
 841  */
 842 void
 843 getpathname(char *namebuf, ino_t curdir, ino_t ino)
 844 {
 845         int len;
 846         char *cp;
 847         struct inodesc idesc;
 848         static int busy = 0;
 849
 850         if (curdir == ino && ino == UFS_ROOTINO) {
 851                 (void)strcpy(namebuf, "/");
 852                 return;
 853         }
 854         if (busy || !INO_IS_DVALID(curdir)) {
 855                 (void)strcpy(namebuf, "?");
 856                 return;
 857         }
 858         busy = 1;
 859         memset(&idesc, 0, sizeof(struct inodesc));
 860         idesc.id_type = DATA;
 861         idesc.id_fix = IGNORE;
 862         cp = &namebuf[MAXPATHLEN - 1];
 863         *cp = '\0';
 864         if (curdir != ino) {
 865                 idesc.id_parent = curdir;
 866                 goto namelookup;
 867         }
 868         while (ino != UFS_ROOTINO) {
 869                 idesc.id_number = ino;
 870                 idesc.id_func = findino;
 871                 idesc.id_name = strdup("..");
 872                 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
 873                         break;
 874         namelookup:
 875                 idesc.id_number = idesc.id_parent;
 876                 idesc.id_parent = ino;
 877                 idesc.id_func = findname;
 878                 idesc.id_name = namebuf;
 879                 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
 880                         break;
 881                 len = strlen(namebuf);
 882                 cp -= len;
 883                 memmove(cp, namebuf, (size_t)len);
 884                 *--cp = '/';
 885                 if (cp < &namebuf[UFS_MAXNAMLEN])
 886                         break;
 887                 ino = idesc.id_number;
 888         }
 889         busy = 0;
 890         if (ino != UFS_ROOTINO)
 891                 *--cp = '?';
 892         memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
 893 }
 894
 895 void
 896 catch(int sig __unused)
 897 {
 898
 899         ckfini(0);
 900         exit(12);
 901 }
 902
 903 /*
 904  * When preening, allow a single quit to signal
 905  * a special exit after file system checks complete
 906  * so that reboot sequence may be interrupted.
 907  */
 908 void
 909 catchquit(int sig __unused)
 910 {
 911         printf("returning to single-user after file system check\n");
 912         returntosingle = 1;
 913         (void)signal(SIGQUIT, SIG_DFL);
 914 }
 915
 916 /*
 917  * determine whether an inode should be fixed.
 918  */
 919 int
 920 dofix(struct inodesc *idesc, const char *msg)
 921 {
 922
 923         switch (idesc->id_fix) {
 924
 925         case DONTKNOW:
 926                 if (idesc->id_type == DATA)
 927                         direrror(idesc->id_number, msg);
 928                 else
 929                         pwarn("%s", msg);
 930                 if (preen) {
 931                         printf(" (SALVAGED)\n");
 932                         idesc->id_fix = FIX;
 933                         return (ALTERED);
 934                 }
 935                 if (reply("SALVAGE") == 0) {
 936                         idesc->id_fix = NOFIX;
 937                         return (0);
 938                 }
 939                 idesc->id_fix = FIX;
 940                 return (ALTERED);
 941
 942         case FIX:
 943                 return (ALTERED);
 944
 945         case NOFIX:
 946         case IGNORE:
 947                 return (0);
 948
 949         default:
 950                 errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
 951         }
 952         /* NOTREACHED */
 953         return (0);
 954 }
 955
 956 #include <stdarg.h>
 957
 958 /*
 959  * An unexpected inconsistency occurred.
 960  * Die if preening or file system is running with soft dependency protocol,
 961  * otherwise just print message and continue.
 962  */
 963 void
 964 pfatal(const char *fmt, ...)
 965 {
 966         va_list ap;
 967         va_start(ap, fmt);
 968         if (!preen) {
 969                 (void)vfprintf(stdout, fmt, ap);
 970                 va_end(ap);
 971                 if (usedsoftdep)
 972                         (void)fprintf(stdout,
 973                             "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
 974                 /*
 975                  * Force foreground fsck to clean up inconsistency.
 976                  */
 977                 if (bkgrdflag) {
 978                         cmd.value = FS_NEEDSFSCK;
 979                         cmd.size = 1;
 980                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 981                             &cmd, sizeof cmd) == -1)
 982                                 pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
 983                         fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
 984                         ckfini(0);
 985                         exit(EEXIT);
 986                 }
 987                 return;
 988         }
 989         if (cdevname == NULL)
 990                 cdevname = strdup("fsck");
 991         (void)fprintf(stdout, "%s: ", cdevname);
 992         (void)vfprintf(stdout, fmt, ap);
 993         (void)fprintf(stdout,
 994             "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
 995             cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
 996         /*
 997          * Force foreground fsck to clean up inconsistency.
 998          */
 999         if (bkgrdflag) {
1000                 cmd.value = FS_NEEDSFSCK;
1001                 cmd.size = 1;
1002                 if (sysctlbyname("vfs.ffs.setflags", 0, 0,
1003                     &cmd, sizeof cmd) == -1)
1004                         pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
1005         }
1006         ckfini(0);
1007         exit(EEXIT);
1008 }
1009
1010 /*
1011  * Pwarn just prints a message when not preening or running soft dependency
1012  * protocol, or a warning (preceded by filename) when preening.
1013  */
1014 void
1015 pwarn(const char *fmt, ...)
1016 {
1017         va_list ap;
1018         va_start(ap, fmt);
1019         if (preen)
1020                 (void)fprintf(stdout, "%s: ", cdevname);
1021         (void)vfprintf(stdout, fmt, ap);
1022         va_end(ap);
1023 }
1024
1025 /*
1026  * Stub for routines from kernel.
1027  */
1028 void
1029 panic(const char *fmt, ...)
1030 {
1031         va_list ap;
1032         va_start(ap, fmt);
1033         pfatal("INTERNAL INCONSISTENCY:");
1034         (void)vfprintf(stdout, fmt, ap);
1035         va_end(ap);
1036         exit(EEXIT);
1037 }