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 %ju out of range",
 148                     (uintmax_t)inum);
 149         ilp = &inostathead[inum / sblock.fs_ipg];
 150         iloff = inum % sblock.fs_ipg;
 151         if (iloff >= ilp->il_numalloced)
 152                 return (&unallocated);
 153         return (&ilp->il_stat[iloff]);
 154 }
 155
 156 /*
 157  * Malloc buffers and set up cache.
 158  */
 159 void
 160 bufinit(void)
 161 {
 162         struct bufarea *bp;
 163         long bufcnt, i;
 164         char *bufp;
 165
 166         pbp = pdirbp = (struct bufarea *)0;
 167         bufp = Malloc((unsigned int)sblock.fs_bsize);
 168         if (bufp == 0)
 169                 errx(EEXIT, "cannot allocate buffer pool");
 170         cgblk.b_un.b_buf = bufp;
 171         initbarea(&cgblk, BT_CYLGRP);
 172         TAILQ_INIT(&bufhead);
 173         bufcnt = MAXBUFS;
 174         if (bufcnt < MINBUFS)
 175                 bufcnt = MINBUFS;
 176         for (i = 0; i < bufcnt; i++) {
 177                 bp = (struct bufarea *)Malloc(sizeof(struct bufarea));
 178                 bufp = Malloc((unsigned int)sblock.fs_bsize);
 179                 if (bp == NULL || bufp == NULL) {
 180                         if (i >= MINBUFS)
 181                                 break;
 182                         errx(EEXIT, "cannot allocate buffer pool");
 183                 }
 184                 bp->b_un.b_buf = bufp;
 185                 TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 186                 initbarea(bp, BT_UNKNOWN);
 187         }
 188         numbufs = i;    /* save number of buffers */
 189         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 190                 readtime[i].tv_sec = totalreadtime[i].tv_sec = 0;
 191                 readtime[i].tv_nsec = totalreadtime[i].tv_nsec = 0;
 192                 readcnt[i] = totalreadcnt[i] = 0;
 193         }
 194 }
 195
 196 /*
 197  * Manage cylinder group buffers.
 198  */
 199 static struct bufarea *cgbufs;  /* header for cylinder group cache */
 200 static int flushtries;          /* number of tries to reclaim memory */
 201
 202 struct bufarea *
 203 cgget(int cg)
 204 {
 205         struct bufarea *cgbp;
 206         struct cg *cgp;
 207
 208         if (cgbufs == NULL) {
 209                 cgbufs = Calloc(sblock.fs_ncg, sizeof(struct bufarea));
 210                 if (cgbufs == NULL)
 211                         errx(EEXIT, "cannot allocate cylinder group buffers");
 212         }
 213         cgbp = &cgbufs[cg];
 214         if (cgbp->b_un.b_cg != NULL)
 215                 return (cgbp);
 216         cgp = NULL;
 217         if (flushtries == 0)
 218                 cgp = malloc((unsigned int)sblock.fs_cgsize);
 219         if (cgp == NULL) {
 220                 getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
 221                 return (&cgblk);
 222         }
 223         cgbp->b_un.b_cg = cgp;
 224         initbarea(cgbp, BT_CYLGRP);
 225         getblk(cgbp, cgtod(&sblock, cg), sblock.fs_cgsize);
 226         return (cgbp);
 227 }
 228
 229 /*
 230  * Attempt to flush a cylinder group cache entry.
 231  * Return whether the flush was successful.
 232  */
 233 int
 234 flushentry(void)
 235 {
 236         struct bufarea *cgbp;
 237
 238         cgbp = &cgbufs[flushtries++];
 239         if (cgbp->b_un.b_cg == NULL)
 240                 return (0);
 241         flush(fswritefd, cgbp);
 242         free(cgbp->b_un.b_buf);
 243         cgbp->b_un.b_buf = NULL;
 244         return (1);
 245 }
 246
 247 /*
 248  * Manage a cache of directory blocks.
 249  */
 250 struct bufarea *
 251 getdatablk(ufs2_daddr_t blkno, long size, int type)
 252 {
 253         struct bufarea *bp;
 254
 255         TAILQ_FOREACH(bp, &bufhead, b_list)
 256                 if (bp->b_bno == fsbtodb(&sblock, blkno))
 257                         goto foundit;
 258         TAILQ_FOREACH_REVERSE(bp, &bufhead, buflist, b_list)
 259                 if ((bp->b_flags & B_INUSE) == 0)
 260                         break;
 261         if (bp == NULL)
 262                 errx(EEXIT, "deadlocked buffer pool");
 263         bp->b_type = type;
 264         getblk(bp, blkno, size);
 265         /* fall through */
 266 foundit:
 267         if (debug && bp->b_type != type)
 268                 printf("Buffer type changed from %s to %s\n",
 269                     buftype[bp->b_type], buftype[type]);
 270         TAILQ_REMOVE(&bufhead, bp, b_list);
 271         TAILQ_INSERT_HEAD(&bufhead, bp, b_list);
 272         bp->b_flags |= B_INUSE;
 273         return (bp);
 274 }
 275
 276 /*
 277  * Timespec operations (from <sys/time.h>).
 278  */
 279 #define timespecsub(vvp, uvp)                                           \
 280         do {                                                            \
 281                 (vvp)->tv_sec -= (uvp)->tv_sec;                         \
 282                 (vvp)->tv_nsec -= (uvp)->tv_nsec;                       \
 283                 if ((vvp)->tv_nsec < 0) {                               \
 284                         (vvp)->tv_sec--;                                \
 285                         (vvp)->tv_nsec += 1000000000;                   \
 286                 }                                                       \
 287         } while (0)
 288 #define timespecadd(vvp, uvp)                                           \
 289         do {                                                            \
 290                 (vvp)->tv_sec += (uvp)->tv_sec;                         \
 291                 (vvp)->tv_nsec += (uvp)->tv_nsec;                       \
 292                 if ((vvp)->tv_nsec >= 1000000000) {                     \
 293                         (vvp)->tv_sec++;                                \
 294                         (vvp)->tv_nsec -= 1000000000;                   \
 295                 }                                                       \
 296         } while (0)
 297
 298 void
 299 getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
 300 {
 301         ufs2_daddr_t dblk;
 302         struct timespec start, finish;
 303
 304         dblk = fsbtodb(&sblock, blk);
 305         if (bp->b_bno == dblk) {
 306                 totalreads++;
 307         } else {
 308                 flush(fswritefd, bp);
 309                 if (debug) {
 310                         readcnt[bp->b_type]++;
 311                         clock_gettime(CLOCK_REALTIME_PRECISE, &start);
 312                 }
 313                 bp->b_errs = blread(fsreadfd, bp->b_un.b_buf, dblk, size);
 314                 if (debug) {
 315                         clock_gettime(CLOCK_REALTIME_PRECISE, &finish);
 316                         timespecsub(&finish, &start);
 317                         timespecadd(&readtime[bp->b_type], &finish);
 318                 }
 319                 bp->b_bno = dblk;
 320                 bp->b_size = size;
 321         }
 322 }
 323
 324 void
 325 flush(int fd, struct bufarea *bp)
 326 {
 327         int i, j;
 328
 329         if (!bp->b_dirty)
 330                 return;
 331         bp->b_dirty = 0;
 332         if (fswritefd < 0) {
 333                 pfatal("WRITING IN READ_ONLY MODE.\n");
 334                 return;
 335         }
 336         if (bp->b_errs != 0)
 337                 pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
 338                     (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
 339                     (long long)bp->b_bno);
 340         bp->b_errs = 0;
 341         blwrite(fd, bp->b_un.b_buf, bp->b_bno, bp->b_size);
 342         if (bp != &sblk)
 343                 return;
 344         for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
 345                 blwrite(fswritefd, (char *)sblock.fs_csp + i,
 346                     fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
 347                     sblock.fs_cssize - i < sblock.fs_bsize ?
 348                     sblock.fs_cssize - i : sblock.fs_bsize);
 349         }
 350 }
 351
 352 void
 353 rwerror(const char *mesg, ufs2_daddr_t blk)
 354 {
 355
 356         if (bkgrdcheck)
 357                 exit(EEXIT);
 358         if (preen == 0)
 359                 printf("\n");
 360         pfatal("CANNOT %s: %ld", mesg, (long)blk);
 361         if (reply("CONTINUE") == 0)
 362                 exit(EEXIT);
 363 }
 364
 365 void
 366 ckfini(int markclean)
 367 {
 368         struct bufarea *bp, *nbp;
 369         int ofsmodified, cnt;
 370
 371         if (bkgrdflag) {
 372                 unlink(snapname);
 373                 if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
 374                         cmd.value = FS_UNCLEAN;
 375                         cmd.size = markclean ? -1 : 1;
 376                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 377                             &cmd, sizeof cmd) == -1)
 378                                 rwerror("SET FILE SYSTEM FLAGS", FS_UNCLEAN);
 379                         if (!preen) {
 380                                 printf("\n***** FILE SYSTEM MARKED %s *****\n",
 381                                     markclean ? "CLEAN" : "DIRTY");
 382                                 if (!markclean)
 383                                         rerun = 1;
 384                         }
 385                 } else if (!preen && !markclean) {
 386                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 387                         rerun = 1;
 388                 }
 389         }
 390         if (debug && totalreads > 0)
 391                 printf("cache with %d buffers missed %ld of %ld (%d%%)\n",
 392                     numbufs, totaldiskreads, totalreads,
 393                     (int)(totaldiskreads * 100 / totalreads));
 394         if (fswritefd < 0) {
 395                 (void)close(fsreadfd);
 396                 return;
 397         }
 398         flush(fswritefd, &sblk);
 399         if (havesb && cursnapshot == 0 && sblock.fs_magic == FS_UFS2_MAGIC &&
 400             sblk.b_bno != sblock.fs_sblockloc / dev_bsize &&
 401             !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
 402                 sblk.b_bno = sblock.fs_sblockloc / dev_bsize;
 403                 sbdirty();
 404                 flush(fswritefd, &sblk);
 405         }
 406         flush(fswritefd, &cgblk);
 407         free(cgblk.b_un.b_buf);
 408         cnt = 0;
 409         TAILQ_FOREACH_REVERSE_SAFE(bp, &bufhead, buflist, b_list, nbp) {
 410                 TAILQ_REMOVE(&bufhead, bp, b_list);
 411                 cnt++;
 412                 flush(fswritefd, bp);
 413                 free(bp->b_un.b_buf);
 414                 free((char *)bp);
 415         }
 416         if (numbufs != cnt)
 417                 errx(EEXIT, "panic: lost %d buffers", numbufs - cnt);
 418         for (cnt = 0; cnt < sblock.fs_ncg; cnt++) {
 419                 if (cgbufs[cnt].b_un.b_cg == NULL)
 420                         continue;
 421                 flush(fswritefd, &cgbufs[cnt]);
 422                 free(cgbufs[cnt].b_un.b_cg);
 423         }
 424         free(cgbufs);
 425         pbp = pdirbp = (struct bufarea *)0;
 426         if (cursnapshot == 0 && sblock.fs_clean != markclean) {
 427                 if ((sblock.fs_clean = markclean) != 0) {
 428                         sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
 429                         sblock.fs_pendingblocks = 0;
 430                         sblock.fs_pendinginodes = 0;
 431                 }
 432                 sbdirty();
 433                 ofsmodified = fsmodified;
 434                 flush(fswritefd, &sblk);
 435                 fsmodified = ofsmodified;
 436                 if (!preen) {
 437                         printf("\n***** FILE SYSTEM MARKED %s *****\n",
 438                             markclean ? "CLEAN" : "DIRTY");
 439                         if (!markclean)
 440                                 rerun = 1;
 441                 }
 442         } else if (!preen) {
 443                 if (markclean) {
 444                         printf("\n***** FILE SYSTEM IS CLEAN *****\n");
 445                 } else {
 446                         printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
 447                         rerun = 1;
 448                 }
 449         }
 450         (void)close(fsreadfd);
 451         (void)close(fswritefd);
 452 }
 453
 454 /*
 455  * Print out I/O statistics.
 456  */
 457 void
 458 IOstats(char *what)
 459 {
 460         int i;
 461
 462         if (debug == 0)
 463                 return;
 464         if (diskreads == 0) {
 465                 printf("%s: no I/O\n\n", what);
 466                 return;
 467         }
 468         if (startpass.tv_sec == 0)
 469                 startpass = startprog;
 470         printf("%s: I/O statistics\n", what);
 471         printIOstats();
 472         totaldiskreads += diskreads;
 473         diskreads = 0;
 474         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 475                 timespecadd(&totalreadtime[i], &readtime[i]);
 476                 totalreadcnt[i] += readcnt[i];
 477                 readtime[i].tv_sec = readtime[i].tv_nsec = 0;
 478                 readcnt[i] = 0;
 479         }
 480         clock_gettime(CLOCK_REALTIME_PRECISE, &startpass);
 481 }
 482
 483 void
 484 finalIOstats(void)
 485 {
 486         int i;
 487
 488         if (debug == 0)
 489                 return;
 490         printf("Final I/O statistics\n");
 491         totaldiskreads += diskreads;
 492         diskreads = totaldiskreads;
 493         startpass = startprog;
 494         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 495                 timespecadd(&totalreadtime[i], &readtime[i]);
 496                 totalreadcnt[i] += readcnt[i];
 497                 readtime[i] = totalreadtime[i];
 498                 readcnt[i] = totalreadcnt[i];
 499         }
 500         printIOstats();
 501 }
 502
 503 static void printIOstats(void)
 504 {
 505         long long msec, totalmsec;
 506         int i;
 507
 508         clock_gettime(CLOCK_REALTIME_PRECISE, &finishpass);
 509         timespecsub(&finishpass, &startpass);
 510         printf("Running time: %jd.%03ld sec\n",
 511                 (intmax_t)finishpass.tv_sec, finishpass.tv_nsec / 1000000);
 512         printf("buffer reads by type:\n");
 513         for (totalmsec = 0, i = 0; i < BT_NUMBUFTYPES; i++)
 514                 totalmsec += readtime[i].tv_sec * 1000 +
 515                     readtime[i].tv_nsec / 1000000;
 516         if (totalmsec == 0)
 517                 totalmsec = 1;
 518         for (i = 0; i < BT_NUMBUFTYPES; i++) {
 519                 if (readcnt[i] == 0)
 520                         continue;
 521                 msec =
 522                     readtime[i].tv_sec * 1000 + readtime[i].tv_nsec / 1000000;
 523                 printf("%21s:%8ld %2ld.%ld%% %4jd.%03ld sec %2lld.%lld%%\n",
 524                     buftype[i], readcnt[i], readcnt[i] * 100 / diskreads,
 525                     (readcnt[i] * 1000 / diskreads) % 10,
 526                     (intmax_t)readtime[i].tv_sec, readtime[i].tv_nsec / 1000000,
 527                     msec * 100 / totalmsec, (msec * 1000 / totalmsec) % 10);
 528         }
 529         printf("\n");
 530 }
 531
 532 int
 533 blread(int fd, char *buf, ufs2_daddr_t blk, long size)
 534 {
 535         char *cp;
 536         int i, errs;
 537         off_t offset;
 538
 539         offset = blk;
 540         offset *= dev_bsize;
 541         if (bkgrdflag)
 542                 slowio_start();
 543         totalreads++;
 544         diskreads++;
 545         if (lseek(fd, offset, 0) < 0)
 546                 rwerror("SEEK BLK", blk);
 547         else if (read(fd, buf, (int)size) == size) {
 548                 if (bkgrdflag)
 549                         slowio_end();
 550                 return (0);
 551         }
 552         rwerror("READ BLK", blk);
 553         if (lseek(fd, offset, 0) < 0)
 554                 rwerror("SEEK BLK", blk);
 555         errs = 0;
 556         memset(buf, 0, (size_t)size);
 557         printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
 558         for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
 559                 if (read(fd, cp, (int)secsize) != secsize) {
 560                         (void)lseek(fd, offset + i + secsize, 0);
 561                         if (secsize != dev_bsize && dev_bsize != 1)
 562                                 printf(" %jd (%jd),",
 563                                     (intmax_t)(blk * dev_bsize + i) / secsize,
 564                                     (intmax_t)blk + i / dev_bsize);
 565                         else
 566                                 printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 567                         errs++;
 568                 }
 569         }
 570         printf("\n");
 571         if (errs)
 572                 resolved = 0;
 573         return (errs);
 574 }
 575
 576 void
 577 blwrite(int fd, char *buf, ufs2_daddr_t blk, ssize_t size)
 578 {
 579         int i;
 580         char *cp;
 581         off_t offset;
 582
 583         if (fd < 0)
 584                 return;
 585         offset = blk;
 586         offset *= dev_bsize;
 587         if (lseek(fd, offset, 0) < 0)
 588                 rwerror("SEEK BLK", blk);
 589         else if (write(fd, buf, size) == size) {
 590                 fsmodified = 1;
 591                 return;
 592         }
 593         resolved = 0;
 594         rwerror("WRITE BLK", blk);
 595         if (lseek(fd, offset, 0) < 0)
 596                 rwerror("SEEK BLK", blk);
 597         printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
 598         for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
 599                 if (write(fd, cp, dev_bsize) != dev_bsize) {
 600                         (void)lseek(fd, offset + i + dev_bsize, 0);
 601                         printf(" %jd,", (intmax_t)blk + i / dev_bsize);
 602                 }
 603         printf("\n");
 604         return;
 605 }
 606
 607 void
 608 blerase(int fd, ufs2_daddr_t blk, long size)
 609 {
 610         off_t ioarg[2];
 611
 612         if (fd < 0)
 613                 return;
 614         ioarg[0] = blk * dev_bsize;
 615         ioarg[1] = size;
 616         ioctl(fd, DIOCGDELETE, ioarg);
 617         /* we don't really care if we succeed or not */
 618         return;
 619 }
 620
 621 void
 622 blzero(int fd, ufs2_daddr_t blk, long size)
 623 {
 624         static char *zero;
 625         off_t offset, len;
 626
 627         if (fd < 0)
 628                 return;
 629         len = ZEROBUFSIZE;
 630         if (zero == NULL) {
 631                 zero = calloc(len, 1);
 632                 if (zero == NULL)
 633                         errx(EEXIT, "cannot allocate buffer pool");
 634         }
 635         offset = blk * dev_bsize;
 636         if (lseek(fd, offset, 0) < 0)
 637                 rwerror("SEEK BLK", blk);
 638         while (size > 0) {
 639                 if (size > len)
 640                         size = len;
 641                 else
 642                         len = size;
 643                 if (write(fd, zero, len) != len)
 644                         rwerror("WRITE BLK", blk);
 645                 blk += len / dev_bsize;
 646                 size -= len;
 647         }
 648 }
 649
 650 /*
 651  * Verify cylinder group's magic number and other parameters.  If the
 652  * test fails, offer an option to rebuild the whole cylinder group.
 653  */
 654 int
 655 check_cgmagic(int cg, struct bufarea *cgbp)
 656 {
 657         struct cg *cgp = cgbp->b_un.b_cg;
 658
 659         /*
 660          * Extended cylinder group checks.
 661          */
 662         if (cg_chkmagic(cgp) &&
 663             ((sblock.fs_magic == FS_UFS1_MAGIC &&
 664               cgp->cg_old_niblk == sblock.fs_ipg &&
 665               cgp->cg_ndblk <= sblock.fs_fpg &&
 666               cgp->cg_old_ncyl <= sblock.fs_old_cpg) ||
 667              (sblock.fs_magic == FS_UFS2_MAGIC &&
 668               cgp->cg_niblk == sblock.fs_ipg &&
 669               cgp->cg_ndblk <= sblock.fs_fpg &&
 670               cgp->cg_initediblk <= sblock.fs_ipg))) {
 671                 return (1);
 672         }
 673         pfatal("CYLINDER GROUP %d: BAD MAGIC NUMBER", cg);
 674         if (!reply("REBUILD CYLINDER GROUP")) {
 675                 printf("YOU WILL NEED TO RERUN FSCK.\n");
 676                 rerun = 1;
 677                 return (1);
 678         }
 679         /*
 680          * Zero out the cylinder group and then initialize critical fields.
 681          * Bit maps and summaries will be recalculated by later passes.
 682          */
 683         memset(cgp, 0, (size_t)sblock.fs_cgsize);
 684         cgp->cg_magic = CG_MAGIC;
 685         cgp->cg_cgx = cg;
 686         cgp->cg_niblk = sblock.fs_ipg;
 687         cgp->cg_initediblk = sblock.fs_ipg < 2 * INOPB(&sblock) ?
 688             sblock.fs_ipg : 2 * INOPB(&sblock);
 689         if (cgbase(&sblock, cg) + sblock.fs_fpg < sblock.fs_size)
 690                 cgp->cg_ndblk = sblock.fs_fpg;
 691         else
 692                 cgp->cg_ndblk = sblock.fs_size - cgbase(&sblock, cg);
 693         cgp->cg_iusedoff = &cgp->cg_space[0] - (u_char *)(&cgp->cg_firstfield);
 694         if (sblock.fs_magic == FS_UFS1_MAGIC) {
 695                 cgp->cg_niblk = 0;
 696                 cgp->cg_initediblk = 0;
 697                 cgp->cg_old_ncyl = sblock.fs_old_cpg;
 698                 cgp->cg_old_niblk = sblock.fs_ipg;
 699                 cgp->cg_old_btotoff = cgp->cg_iusedoff;
 700                 cgp->cg_old_boff = cgp->cg_old_btotoff +
 701                     sblock.fs_old_cpg * sizeof(int32_t);
 702                 cgp->cg_iusedoff = cgp->cg_old_boff +
 703                     sblock.fs_old_cpg * sizeof(u_int16_t);
 704         }
 705         cgp->cg_freeoff = cgp->cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
 706         cgp->cg_nextfreeoff = cgp->cg_freeoff + howmany(sblock.fs_fpg,CHAR_BIT);
 707         if (sblock.fs_contigsumsize > 0) {
 708                 cgp->cg_nclusterblks = cgp->cg_ndblk / sblock.fs_frag;
 709                 cgp->cg_clustersumoff =
 710                     roundup(cgp->cg_nextfreeoff, sizeof(u_int32_t));
 711                 cgp->cg_clustersumoff -= sizeof(u_int32_t);
 712                 cgp->cg_clusteroff = cgp->cg_clustersumoff +
 713                     (sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
 714                 cgp->cg_nextfreeoff = cgp->cg_clusteroff +
 715                     howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
 716         }
 717         dirty(cgbp);
 718         return (0);
 719 }
 720
 721 /*
 722  * allocate a data block with the specified number of fragments
 723  */
 724 ufs2_daddr_t
 725 allocblk(long frags)
 726 {
 727         int i, j, k, cg, baseblk;
 728         struct bufarea *cgbp;
 729         struct cg *cgp;
 730
 731         if (frags <= 0 || frags > sblock.fs_frag)
 732                 return (0);
 733         for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
 734                 for (j = 0; j <= sblock.fs_frag - frags; j++) {
 735                         if (testbmap(i + j))
 736                                 continue;
 737                         for (k = 1; k < frags; k++)
 738                                 if (testbmap(i + j + k))
 739                                         break;
 740                         if (k < frags) {
 741                                 j += k;
 742                                 continue;
 743                         }
 744                         cg = dtog(&sblock, i + j);
 745                         cgbp = cgget(cg);
 746                         cgp = cgbp->b_un.b_cg;
 747                         if (!check_cgmagic(cg, cgbp))
 748                                 return (0);
 749                         baseblk = dtogd(&sblock, i + j);
 750                         for (k = 0; k < frags; k++) {
 751                                 setbmap(i + j + k);
 752                                 clrbit(cg_blksfree(cgp), baseblk + k);
 753                         }
 754                         n_blks += frags;
 755                         if (frags == sblock.fs_frag)
 756                                 cgp->cg_cs.cs_nbfree--;
 757                         else
 758                                 cgp->cg_cs.cs_nffree -= frags;
 759                         dirty(cgbp);
 760                         return (i + j);
 761                 }
 762         }
 763         return (0);
 764 }
 765
 766 /*
 767  * Free a previously allocated block
 768  */
 769 void
 770 freeblk(ufs2_daddr_t blkno, long frags)
 771 {
 772         struct inodesc idesc;
 773
 774         idesc.id_blkno = blkno;
 775         idesc.id_numfrags = frags;
 776         (void)pass4check(&idesc);
 777 }
 778
 779 /* Slow down IO so as to leave some disk bandwidth for other processes */
 780 void
 781 slowio_start()
 782 {
 783
 784         /* Delay one in every 8 operations */
 785         slowio_pollcnt = (slowio_pollcnt + 1) & 7;
 786         if (slowio_pollcnt == 0) {
 787                 gettimeofday(&slowio_starttime, NULL);
 788         }
 789 }
 790
 791 void
 792 slowio_end()
 793 {
 794         struct timeval tv;
 795         int delay_usec;
 796
 797         if (slowio_pollcnt != 0)
 798                 return;
 799
 800         /* Update the slowdown interval. */
 801         gettimeofday(&tv, NULL);
 802         delay_usec = (tv.tv_sec - slowio_starttime.tv_sec) * 1000000 +
 803             (tv.tv_usec - slowio_starttime.tv_usec);
 804         if (delay_usec < 64)
 805                 delay_usec = 64;
 806         if (delay_usec > 2500000)
 807                 delay_usec = 2500000;
 808         slowio_delay_usec = (slowio_delay_usec * 63 + delay_usec) >> 6;
 809         /* delay by 8 times the average IO delay */
 810         if (slowio_delay_usec > 64)
 811                 usleep(slowio_delay_usec * 8);
 812 }
 813
 814 /*
 815  * Find a pathname
 816  */
 817 void
 818 getpathname(char *namebuf, ino_t curdir, ino_t ino)
 819 {
 820         int len;
 821         char *cp;
 822         struct inodesc idesc;
 823         static int busy = 0;
 824
 825         if (curdir == ino && ino == ROOTINO) {
 826                 (void)strcpy(namebuf, "/");
 827                 return;
 828         }
 829         if (busy || !INO_IS_DVALID(curdir)) {
 830                 (void)strcpy(namebuf, "?");
 831                 return;
 832         }
 833         busy = 1;
 834         memset(&idesc, 0, sizeof(struct inodesc));
 835         idesc.id_type = DATA;
 836         idesc.id_fix = IGNORE;
 837         cp = &namebuf[MAXPATHLEN - 1];
 838         *cp = '\0';
 839         if (curdir != ino) {
 840                 idesc.id_parent = curdir;
 841                 goto namelookup;
 842         }
 843         while (ino != ROOTINO) {
 844                 idesc.id_number = ino;
 845                 idesc.id_func = findino;
 846                 idesc.id_name = strdup("..");
 847                 if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
 848                         break;
 849         namelookup:
 850                 idesc.id_number = idesc.id_parent;
 851                 idesc.id_parent = ino;
 852                 idesc.id_func = findname;
 853                 idesc.id_name = namebuf;
 854                 if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
 855                         break;
 856                 len = strlen(namebuf);
 857                 cp -= len;
 858                 memmove(cp, namebuf, (size_t)len);
 859                 *--cp = '/';
 860                 if (cp < &namebuf[MAXNAMLEN])
 861                         break;
 862                 ino = idesc.id_number;
 863         }
 864         busy = 0;
 865         if (ino != ROOTINO)
 866                 *--cp = '?';
 867         memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
 868 }
 869
 870 void
 871 catch(int sig __unused)
 872 {
 873
 874         ckfini(0);
 875         exit(12);
 876 }
 877
 878 /*
 879  * When preening, allow a single quit to signal
 880  * a special exit after file system checks complete
 881  * so that reboot sequence may be interrupted.
 882  */
 883 void
 884 catchquit(int sig __unused)
 885 {
 886         printf("returning to single-user after file system check\n");
 887         returntosingle = 1;
 888         (void)signal(SIGQUIT, SIG_DFL);
 889 }
 890
 891 /*
 892  * determine whether an inode should be fixed.
 893  */
 894 int
 895 dofix(struct inodesc *idesc, const char *msg)
 896 {
 897
 898         switch (idesc->id_fix) {
 899
 900         case DONTKNOW:
 901                 if (idesc->id_type == DATA)
 902                         direrror(idesc->id_number, msg);
 903                 else
 904                         pwarn("%s", msg);
 905                 if (preen) {
 906                         printf(" (SALVAGED)\n");
 907                         idesc->id_fix = FIX;
 908                         return (ALTERED);
 909                 }
 910                 if (reply("SALVAGE") == 0) {
 911                         idesc->id_fix = NOFIX;
 912                         return (0);
 913                 }
 914                 idesc->id_fix = FIX;
 915                 return (ALTERED);
 916
 917         case FIX:
 918                 return (ALTERED);
 919
 920         case NOFIX:
 921         case IGNORE:
 922                 return (0);
 923
 924         default:
 925                 errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
 926         }
 927         /* NOTREACHED */
 928         return (0);
 929 }
 930
 931 #include <stdarg.h>
 932
 933 /*
 934  * An unexpected inconsistency occurred.
 935  * Die if preening or file system is running with soft dependency protocol,
 936  * otherwise just print message and continue.
 937  */
 938 void
 939 pfatal(const char *fmt, ...)
 940 {
 941         va_list ap;
 942         va_start(ap, fmt);
 943         if (!preen) {
 944                 (void)vfprintf(stdout, fmt, ap);
 945                 va_end(ap);
 946                 if (usedsoftdep)
 947                         (void)fprintf(stdout,
 948                             "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
 949                 /*
 950                  * Force foreground fsck to clean up inconsistency.
 951                  */
 952                 if (bkgrdflag) {
 953                         cmd.value = FS_NEEDSFSCK;
 954                         cmd.size = 1;
 955                         if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 956                             &cmd, sizeof cmd) == -1)
 957                                 pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
 958                         fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
 959                         ckfini(0);
 960                         exit(EEXIT);
 961                 }
 962                 return;
 963         }
 964         if (cdevname == NULL)
 965                 cdevname = strdup("fsck");
 966         (void)fprintf(stdout, "%s: ", cdevname);
 967         (void)vfprintf(stdout, fmt, ap);
 968         (void)fprintf(stdout,
 969             "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
 970             cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
 971         /*
 972          * Force foreground fsck to clean up inconsistency.
 973          */
 974         if (bkgrdflag) {
 975                 cmd.value = FS_NEEDSFSCK;
 976                 cmd.size = 1;
 977                 if (sysctlbyname("vfs.ffs.setflags", 0, 0,
 978                     &cmd, sizeof cmd) == -1)
 979                         pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
 980         }
 981         ckfini(0);
 982         exit(EEXIT);
 983 }
 984
 985 /*
 986  * Pwarn just prints a message when not preening or running soft dependency
 987  * protocol, or a warning (preceded by filename) when preening.
 988  */
 989 void
 990 pwarn(const char *fmt, ...)
 991 {
 992         va_list ap;
 993         va_start(ap, fmt);
 994         if (preen)
 995                 (void)fprintf(stdout, "%s: ", cdevname);
 996         (void)vfprintf(stdout, fmt, ap);
 997         va_end(ap);
 998 }
 999
1000 /*
1001  * Stub for routines from kernel.
1002  */
1003 void
1004 panic(const char *fmt, ...)
1005 {
1006         va_list ap;
1007         va_start(ap, fmt);
1008         pfatal("INTERNAL INCONSISTENCY:");
1009         (void)vfprintf(stdout, fmt, ap);
1010         va_end(ap);
1011         exit(EEXIT);
1012 }