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fsutil.c

/*
 * Copyright (c) 1980, 1986, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static const char sccsid[] = "@(#)utilities.c   8.6 (Berkeley) 5/19/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/fsck_ffs/fsutil.c,v 1.26 2006/10/31 22:06:56 pjd Exp $");

#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/disklabel.h>
#include <sys/stat.h>
#include <sys/disklabel.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>

#include <err.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <fstab.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "fsck.h"

static void slowio_start(void);
static void slowio_end(void);

long  diskreads, totalreads;  /* Disk cache statistics */
struct timeval slowio_starttime;
int slowio_delay_usec = 10000;      /* Initial IO delay for background fsck */
int slowio_pollcnt;

int
ftypeok(union dinode *dp)
{
      switch (DIP(dp, di_mode) & IFMT) {

      case IFDIR:
      case IFREG:
      case IFBLK:
      case IFCHR:
      case IFLNK:
      case IFSOCK:
      case IFIFO:
            return (1);

      default:
            if (debug)
                  printf("bad file type 0%o\n", DIP(dp, di_mode));
            return (0);
      }
}

int
reply(const char *question)
{
      int persevere;
      char c;

      if (preen)
            pfatal("INTERNAL ERROR: GOT TO reply()");
      persevere = !strcmp(question, "CONTINUE");
      printf("\n");
      if (!persevere && (nflag || (fswritefd < 0 && bkgrdflag == 0))) {
            printf("%s? no\n\n", question);
            resolved = 0;
            return (0);
      }
      if (yflag || (persevere && nflag)) {
            printf("%s? yes\n\n", question);
            return (1);
      }
      do    {
            printf("%s? [yn] ", question);
            (void) fflush(stdout);
            c = getc(stdin);
            while (c != '\n' && getc(stdin) != '\n') {
                  if (feof(stdin)) {
                        resolved = 0;
                        return (0);
                  }
            }
      } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
      printf("\n");
      if (c == 'y' || c == 'Y')
            return (1);
      resolved = 0;
      return (0);
}

/*
 * Look up state information for an inode.
 */
struct inostat *
inoinfo(ino_t inum)
{
      static struct inostat unallocated = { USTATE, 0, 0 };
      struct inostatlist *ilp;
      int iloff;

      if (inum > maxino)
            errx(EEXIT, "inoinfo: inumber %d out of range", inum);
      ilp = &inostathead[inum / sblock.fs_ipg];
      iloff = inum % sblock.fs_ipg;
      if (iloff >= ilp->il_numalloced)
            return (&unallocated);
      return (&ilp->il_stat[iloff]);
}

/*
 * Malloc buffers and set up cache.
 */
void
bufinit(void)
{
      struct bufarea *bp;
      long bufcnt, i;
      char *bufp;

      pbp = pdirbp = (struct bufarea *)0;
      bufp = malloc((unsigned int)sblock.fs_bsize);
      if (bufp == 0)
            errx(EEXIT, "cannot allocate buffer pool");
      cgblk.b_un.b_buf = bufp;
      initbarea(&cgblk);
      bufhead.b_next = bufhead.b_prev = &bufhead;
      bufcnt = MAXBUFSPACE / sblock.fs_bsize;
      if (bufcnt < MINBUFS)
            bufcnt = MINBUFS;
      for (i = 0; i < bufcnt; i++) {
            bp = (struct bufarea *)malloc(sizeof(struct bufarea));
            bufp = malloc((unsigned int)sblock.fs_bsize);
            if (bp == NULL || bufp == NULL) {
                  if (i >= MINBUFS)
                        break;
                  errx(EEXIT, "cannot allocate buffer pool");
            }
            bp->b_un.b_buf = bufp;
            bp->b_prev = &bufhead;
            bp->b_next = bufhead.b_next;
            bufhead.b_next->b_prev = bp;
            bufhead.b_next = bp;
            initbarea(bp);
      }
      bufhead.b_size = i;     /* save number of buffers */
}

/*
 * Manage a cache of directory blocks.
 */
struct bufarea *
getdatablk(ufs2_daddr_t blkno, long size)
{
      struct bufarea *bp;

      for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
            if (bp->b_bno == fsbtodb(&sblock, blkno))
                  goto foundit;
      for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
            if ((bp->b_flags & B_INUSE) == 0)
                  break;
      if (bp == &bufhead)
            errx(EEXIT, "deadlocked buffer pool");
      getblk(bp, blkno, size);
      /* fall through */
foundit:
      bp->b_prev->b_next = bp->b_next;
      bp->b_next->b_prev = bp->b_prev;
      bp->b_prev = &bufhead;
      bp->b_next = bufhead.b_next;
      bufhead.b_next->b_prev = bp;
      bufhead.b_next = bp;
      bp->b_flags |= B_INUSE;
      return (bp);
}

void
getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
{
      ufs2_daddr_t dblk;

      totalreads++;
      dblk = fsbtodb(&sblock, blk);
      if (bp->b_bno != dblk) {
            flush(fswritefd, bp);
            diskreads++;
            bp->b_errs = blread(fsreadfd, bp->b_un.b_buf, dblk, size);
            bp->b_bno = dblk;
            bp->b_size = size;
      }
}

void
flush(int fd, struct bufarea *bp)
{
      int i, j;

      if (!bp->b_dirty)
            return;
      bp->b_dirty = 0;
      if (fswritefd < 0) {
            pfatal("WRITING IN READ_ONLY MODE.\n");
            return;
      }
      if (bp->b_errs != 0)
            pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
                (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
                (long long)bp->b_bno);
      bp->b_errs = 0;
      blwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
      if (bp != &sblk)
            return;
      for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
            blwrite(fswritefd, (char *)sblock.fs_csp + i,
                fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
                sblock.fs_cssize - i < sblock.fs_bsize ?
                sblock.fs_cssize - i : sblock.fs_bsize);
      }
}

void
rwerror(const char *mesg, ufs2_daddr_t blk)
{

      if (bkgrdcheck)
            exit(EEXIT);
      if (preen == 0)
            printf("\n");
      pfatal("CANNOT %s: %ld", mesg, (long)blk);
      if (reply("CONTINUE") == 0)
            exit(EEXIT);
}

void
ckfini(int markclean)
{
      struct bufarea *bp, *nbp;
      int ofsmodified, cnt = 0;

      if (bkgrdflag) {
            unlink(snapname);
            if ((!(sblock.fs_flags & FS_UNCLEAN)) != markclean) {
                  cmd.value = FS_UNCLEAN;
                  cmd.size = markclean ? -1 : 1;
                  if (sysctlbyname("vfs.ffs.setflags", 0, 0,
                      &cmd, sizeof cmd) == -1)
                        rwerror("SET FILE SYSTEM FLAGS", FS_UNCLEAN);
                  if (!preen) {
                        printf("\n***** FILE SYSTEM MARKED %s *****\n",
                            markclean ? "CLEAN" : "DIRTY");
                        if (!markclean)
                              rerun = 1;
                  }
            } else if (!preen && !markclean) {
                  printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
                  rerun = 1;
            }
      }
      if (fswritefd < 0) {
            (void)close(fsreadfd);
            return;
      }
      flush(fswritefd, &sblk);
      if (havesb && cursnapshot == 0 && sblock.fs_magic == FS_UFS2_MAGIC &&
          sblk.b_bno != sblock.fs_sblockloc / dev_bsize &&
          !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
            sblk.b_bno = sblock.fs_sblockloc / dev_bsize;
            sbdirty();
            flush(fswritefd, &sblk);
      }
      flush(fswritefd, &cgblk);
      free(cgblk.b_un.b_buf);
      for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
            cnt++;
            flush(fswritefd, bp);
            nbp = bp->b_prev;
            free(bp->b_un.b_buf);
            free((char *)bp);
      }
      if (bufhead.b_size != cnt)
            errx(EEXIT, "panic: lost %d buffers", bufhead.b_size - cnt);
      pbp = pdirbp = (struct bufarea *)0;
      if (cursnapshot == 0 && sblock.fs_clean != markclean) {
            if ((sblock.fs_clean = markclean) != 0) {
                  sblock.fs_flags &= ~(FS_UNCLEAN | FS_NEEDSFSCK);
                  sblock.fs_pendingblocks = 0;
                  sblock.fs_pendinginodes = 0;
            }
            sbdirty();
            ofsmodified = fsmodified;
            flush(fswritefd, &sblk);
            fsmodified = ofsmodified;
            if (!preen) {
                  printf("\n***** FILE SYSTEM MARKED %s *****\n",
                      markclean ? "CLEAN" : "DIRTY");
                  if (!markclean)
                        rerun = 1;
            }
      } else if (!preen && !markclean) {
            printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
            rerun = 1;
      }
      if (debug && totalreads > 0)
            printf("cache missed %ld of %ld (%d%%)\n", diskreads,
                totalreads, (int)(diskreads * 100 / totalreads));
      (void)close(fsreadfd);
      (void)close(fswritefd);
}

int
blread(int fd, char *buf, ufs2_daddr_t blk, long size)
{
      char *cp;
      int i, errs;
      off_t offset;

      offset = blk;
      offset *= dev_bsize;
      if (bkgrdflag)
            slowio_start();
      if (lseek(fd, offset, 0) < 0)
            rwerror("SEEK BLK", blk);
      else if (read(fd, buf, (int)size) == size) {
            if (bkgrdflag)
                  slowio_end();
            return (0);
      }
      rwerror("READ BLK", blk);
      if (lseek(fd, offset, 0) < 0)
            rwerror("SEEK BLK", blk);
      errs = 0;
      memset(buf, 0, (size_t)size);
      printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
      for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
            if (read(fd, cp, (int)secsize) != secsize) {
                  (void)lseek(fd, offset + i + secsize, 0);
                  if (secsize != dev_bsize && dev_bsize != 1)
                        printf(" %jd (%jd),",
                            (intmax_t)(blk * dev_bsize + i) / secsize,
                            (intmax_t)blk + i / dev_bsize);
                  else
                        printf(" %jd,", (intmax_t)blk + i / dev_bsize);
                  errs++;
            }
      }
      printf("\n");
      if (errs)
            resolved = 0;
      return (errs);
}

void
blwrite(int fd, char *buf, ufs2_daddr_t blk, long size)
{
      int i;
      char *cp;
      off_t offset;

      if (fd < 0)
            return;
      offset = blk;
      offset *= dev_bsize;
      if (lseek(fd, offset, 0) < 0)
            rwerror("SEEK BLK", blk);
      else if (write(fd, buf, (int)size) == size) {
            fsmodified = 1;
            return;
      }
      resolved = 0;
      rwerror("WRITE BLK", blk);
      if (lseek(fd, offset, 0) < 0)
            rwerror("SEEK BLK", blk);
      printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
      for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
            if (write(fd, cp, (int)dev_bsize) != dev_bsize) {
                  (void)lseek(fd, offset + i + dev_bsize, 0);
                  printf(" %jd,", (intmax_t)blk + i / dev_bsize);
            }
      printf("\n");
      return;
}

/*
 * allocate a data block with the specified number of fragments
 */
ufs2_daddr_t
allocblk(long frags)
{
      int i, j, k, cg, baseblk;
      struct cg *cgp = &cgrp;

      if (frags <= 0 || frags > sblock.fs_frag)
            return (0);
      for (i = 0; i < maxfsblock - sblock.fs_frag; i += sblock.fs_frag) {
            for (j = 0; j <= sblock.fs_frag - frags; j++) {
                  if (testbmap(i + j))
                        continue;
                  for (k = 1; k < frags; k++)
                        if (testbmap(i + j + k))
                              break;
                  if (k < frags) {
                        j += k;
                        continue;
                  }
                  cg = dtog(&sblock, i + j);
                  getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
                  if (!cg_chkmagic(cgp))
                        pfatal("CG %d: BAD MAGIC NUMBER\n", cg);
                  baseblk = dtogd(&sblock, i + j);
                  for (k = 0; k < frags; k++) {
                        setbmap(i + j + k);
                        clrbit(cg_blksfree(cgp), baseblk + k);
                  }
                  n_blks += frags;
                  if (frags == sblock.fs_frag)
                        cgp->cg_cs.cs_nbfree--;
                  else
                        cgp->cg_cs.cs_nffree -= frags;
                  cgdirty();
                  return (i + j);
            }
      }
      return (0);
}

/*
 * Free a previously allocated block
 */
void
freeblk(ufs2_daddr_t blkno, long frags)
{
      struct inodesc idesc;

      idesc.id_blkno = blkno;
      idesc.id_numfrags = frags;
      (void)pass4check(&idesc);
}

/* Slow down IO so as to leave some disk bandwidth for other processes */
void
slowio_start()
{

      /* Delay one in every 8 operations */
      slowio_pollcnt = (slowio_pollcnt + 1) & 7;
      if (slowio_pollcnt == 0) {
            gettimeofday(&slowio_starttime, NULL);
      }
}

void
slowio_end()
{
      struct timeval tv;
      int delay_usec;

      if (slowio_pollcnt != 0)
            return;

      /* Update the slowdown interval. */
      gettimeofday(&tv, NULL);
      delay_usec = (tv.tv_sec - slowio_starttime.tv_sec) * 1000000 +
          (tv.tv_usec - slowio_starttime.tv_usec);
      if (delay_usec < 64)
            delay_usec = 64;
      if (delay_usec > 2500000)
            delay_usec = 2500000;
      slowio_delay_usec = (slowio_delay_usec * 63 + delay_usec) >> 6;
      /* delay by 8 times the average IO delay */
      if (slowio_delay_usec > 64)
            usleep(slowio_delay_usec * 8);
}

/*
 * Find a pathname
 */
void
getpathname(char *namebuf, ino_t curdir, ino_t ino)
{
      int len;
      char *cp;
      struct inodesc idesc;
      static int busy = 0;

      if (curdir == ino && ino == ROOTINO) {
            (void)strcpy(namebuf, "/");
            return;
      }
      if (busy || !INO_IS_DVALID(curdir)) {
            (void)strcpy(namebuf, "?");
            return;
      }
      busy = 1;
      memset(&idesc, 0, sizeof(struct inodesc));
      idesc.id_type = DATA;
      idesc.id_fix = IGNORE;
      cp = &namebuf[MAXPATHLEN - 1];
      *cp = '\0';
      if (curdir != ino) {
            idesc.id_parent = curdir;
            goto namelookup;
      }
      while (ino != ROOTINO) {
            idesc.id_number = ino;
            idesc.id_func = findino;
            idesc.id_name = strdup("..");
            if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
                  break;
      namelookup:
            idesc.id_number = idesc.id_parent;
            idesc.id_parent = ino;
            idesc.id_func = findname;
            idesc.id_name = namebuf;
            if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
                  break;
            len = strlen(namebuf);
            cp -= len;
            memmove(cp, namebuf, (size_t)len);
            *--cp = '/';
            if (cp < &namebuf[MAXNAMLEN])
                  break;
            ino = idesc.id_number;
      }
      busy = 0;
      if (ino != ROOTINO)
            *--cp = '?';
      memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
}

void
catch(int sig __unused)
{

      ckfini(0);
      exit(12);
}

/*
 * When preening, allow a single quit to signal
 * a special exit after file system checks complete
 * so that reboot sequence may be interrupted.
 */
void
catchquit(int sig __unused)
{
      printf("returning to single-user after file system check\n");
      returntosingle = 1;
      (void)signal(SIGQUIT, SIG_DFL);
}

/*
 * determine whether an inode should be fixed.
 */
int
dofix(struct inodesc *idesc, const char *msg)
{

      switch (idesc->id_fix) {

      case DONTKNOW:
            if (idesc->id_type == DATA)
                  direrror(idesc->id_number, msg);
            else
                  pwarn("%s", msg);
            if (preen) {
                  printf(" (SALVAGED)\n");
                  idesc->id_fix = FIX;
                  return (ALTERED);
            }
            if (reply("SALVAGE") == 0) {
                  idesc->id_fix = NOFIX;
                  return (0);
            }
            idesc->id_fix = FIX;
            return (ALTERED);

      case FIX:
            return (ALTERED);

      case NOFIX:
      case IGNORE:
            return (0);

      default:
            errx(EEXIT, "UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
      }
      /* NOTREACHED */
      return (0);
}

#include <stdarg.h>

/*
 * An unexpected inconsistency occured.
 * Die if preening or file system is running with soft dependency protocol,
 * otherwise just print message and continue.
 */
void
pfatal(const char *fmt, ...)
{
      va_list ap;
      va_start(ap, fmt);
      if (!preen) {
            (void)vfprintf(stdout, fmt, ap);
            va_end(ap);
            if (usedsoftdep)
                  (void)fprintf(stdout,
                      "\nUNEXPECTED SOFT UPDATE INCONSISTENCY\n");
            /*
             * Force foreground fsck to clean up inconsistency.
             */
            if (bkgrdflag) {
                  cmd.value = FS_NEEDSFSCK;
                  cmd.size = 1;
                  if (sysctlbyname("vfs.ffs.setflags", 0, 0,
                      &cmd, sizeof cmd) == -1)
                        pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
                  fprintf(stdout, "CANNOT RUN IN BACKGROUND\n");
                  ckfini(0);
                  exit(EEXIT);
            }
            return;
      }
      if (cdevname == NULL)
            cdevname = strdup("fsck");
      (void)fprintf(stdout, "%s: ", cdevname);
      (void)vfprintf(stdout, fmt, ap);
      (void)fprintf(stdout,
          "\n%s: UNEXPECTED%sINCONSISTENCY; RUN fsck MANUALLY.\n",
          cdevname, usedsoftdep ? " SOFT UPDATE " : " ");
      /*
       * Force foreground fsck to clean up inconsistency.
       */
      if (bkgrdflag) {
            cmd.value = FS_NEEDSFSCK;
            cmd.size = 1;
            if (sysctlbyname("vfs.ffs.setflags", 0, 0,
                &cmd, sizeof cmd) == -1)
                  pwarn("CANNOT SET FS_NEEDSFSCK FLAG\n");
      }
      ckfini(0);
      exit(EEXIT);
}

/*
 * Pwarn just prints a message when not preening or running soft dependency
 * protocol, or a warning (preceded by filename) when preening.
 */
void
pwarn(const char *fmt, ...)
{
      va_list ap;
      va_start(ap, fmt);
      if (preen)
            (void)fprintf(stdout, "%s: ", cdevname);
      (void)vfprintf(stdout, fmt, ap);
      va_end(ap);
}

/*
 * Stub for routines from kernel.
 */
void
panic(const char *fmt, ...)
{
      va_list ap;
      va_start(ap, fmt);
      pfatal("INTERNAL INCONSISTENCY:");
      (void)vfprintf(stdout, fmt, ap);
      va_end(ap);
      exit(EEXIT);
}

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