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NetBSD/sbin/fsck_ffs/utilities.c

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/* $NetBSD: utilities.c,v 1.56 2008/07/31 05:38:04 simonb Exp $ */
/*
* 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.
* 3. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)utilities.c 8.6 (Berkeley) 5/19/95";
#else
__RCSID("$NetBSD: utilities.c,v 1.56 2008/07/31 05:38:04 simonb Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include "fsutil.h"
#include "fsck.h"
#include "extern.h"
#include "exitvalues.h"
long diskreads, totalreads; /* Disk cache statistics */
static void rwerror(const char *, daddr_t);
extern int returntosingle;
int
ftypeok(union dinode *dp)
{
switch (iswap16(DIP(dp, 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", iswap16(DIP(dp, 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)) {
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);
}
/*
* 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)
errexit("cannot allocate buffer pool");
cgblk.b_un.b_buf = bufp;
initbarea(&cgblk);
bufp = malloc((unsigned int)APPLEUFS_LABEL_SIZE);
if (bufp == 0)
errexit("cannot allocate buffer pool");
appleufsblk.b_un.b_buf = bufp;
initbarea(&appleufsblk);
bufhead.b_next = bufhead.b_prev = &bufhead;
bufcnt = MAXBUFSPACE / sblock->fs_bsize;
if (bufcnt < MINBUFS)
bufcnt = MINBUFS;
for (i = 0; i < bufcnt; i++) {
bp = malloc(sizeof(struct bufarea));
bufp = malloc((unsigned int)sblock->fs_bsize);
if (bp == NULL || bufp == NULL) {
if (i >= MINBUFS) {
if (bp)
free(bp);
if (bufp)
free(bufp);
break;
}
errexit("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(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)
errexit("deadlocked buffer pool");
/* fall through */
foundit:
getblk(bp, blkno, size);
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, daddr_t blk, long size)
{
daddr_t dblk;
dblk = fsbtodb(sblock, blk);
totalreads++;
if (bp->b_bno != dblk) {
flush(fswritefd, bp);
diskreads++;
bp->b_errs = bread(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;
struct csum *ccsp;
if (!bp->b_dirty)
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_dirty = 0;
bp->b_errs = 0;
bwrite(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++) {
int size = sblock->fs_cssize - i < sblock->fs_bsize ?
sblock->fs_cssize - i : sblock->fs_bsize;
ccsp = (struct csum *)((char *)sblock->fs_csp + i);
if (needswap)
ffs_csum_swap(ccsp, ccsp, size);
bwrite(fswritefd, (char *)ccsp,
fsbtodb(sblock, sblock->fs_csaddr + j * sblock->fs_frag),
size);
if (needswap)
ffs_csum_swap(ccsp, ccsp, size);
}
}
static void
rwerror(const char *mesg, daddr_t blk)
{
if (preen == 0)
printf("\n");
pfatal("CANNOT %s: BLK %lld", mesg, (long long)blk);
if (reply("CONTINUE") == 0)
exit(FSCK_EXIT_CHECK_FAILED);
}
void
ckfini(void)
{
struct bufarea *bp, *nbp;
int ofsmodified, cnt = 0;
if (fswritefd < 0) {
(void)close(fsreadfd);
return;
}
flush(fswritefd, &sblk);
if (havesb && bflag != 0 &&
(preen || reply("UPDATE STANDARD SUPERBLOCK"))) {
if (preen)
pwarn("UPDATING STANDARD SUPERBLOCK\n");
if (!is_ufs2 && (sblock->fs_old_flags & FS_FLAGS_UPDATED) == 0)
sblk.b_bno = SBLOCK_UFS1 / dev_bsize;
else
sblk.b_bno = sblock->fs_sblockloc / dev_bsize;
sbdirty();
flush(fswritefd, &sblk);
}
flush(fswritefd, &appleufsblk);
free(appleufsblk.b_un.b_buf);
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)
errexit("Panic: lost %d buffers", bufhead.b_size - cnt);
pbp = pdirbp = (struct bufarea *)0;
if (markclean && (sblock->fs_clean & FS_ISCLEAN) == 0) {
/*
* Mark the file system as clean, and sync the superblock.
*/
if (preen)
pwarn("MARKING FILE SYSTEM CLEAN\n");
else if (!reply("MARK FILE SYSTEM CLEAN"))
markclean = 0;
if (markclean) {
sblock->fs_clean = FS_ISCLEAN;
sblock->fs_pendingblocks = 0;
sblock->fs_pendinginodes = 0;
sbdirty();
ofsmodified = fsmodified;
flush(fswritefd, &sblk);
#if LITE2BORKEN
fsmodified = ofsmodified;
#endif
if (!preen)
printf(
"\n***** FILE SYSTEM MARKED CLEAN *****\n");
}
}
if (debug)
printf("cache missed %ld of %ld (%d%%)\n", diskreads,
totalreads, (int)(diskreads * 100 / totalreads));
cleanup_wapbl();
(void)close(fsreadfd);
(void)close(fswritefd);
}
int
bread(int fd, char *buf, daddr_t blk, long size)
{
char *cp;
int i, errs;
off_t offset;
offset = blk;
offset *= dev_bsize;
if ((pread(fd, buf, (int)size, offset) == size) &&
read_wapbl(buf, size, blk) == 0)
return (0);
rwerror("READ", 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 (pread(fd, cp, (int)secsize, offset + i) != secsize) {
if (secsize != dev_bsize && dev_bsize != 1)
printf(" %lld (%lld),",
(long long)((blk*dev_bsize + i) / secsize),
(long long)(blk + i / dev_bsize));
else
printf(" %lld,",
(long long)(blk + i / dev_bsize));
errs++;
}
}
printf("\n");
return (errs);
}
void
bwrite(int fd, char *buf, daddr_t blk, long size)
{
int i;
char *cp;
off_t offset;
if (fd < 0)
return;
offset = blk;
offset *= dev_bsize;
if (pwrite(fd, buf, (int)size, offset) == size) {
fsmodified = 1;
return;
}
rwerror("WRITE", blk);
printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
if (pwrite(fd, cp, (int)dev_bsize, offset + i) != dev_bsize)
printf(" %lld,", (long long)(blk + i / dev_bsize));
printf("\n");
return;
}
/*
* allocate a data block with the specified number of fragments
*/
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);
memcpy(cgp, cgblk.b_un.b_cg, sblock->fs_cgsize);
if ((doswap && !needswap) || (!doswap && needswap))
ffs_cg_swap(cgblk.b_un.b_cg, cgp, sblock);
if (!cg_chkmagic(cgp, 0))
pfatal("CG %d: ALLOCBLK: BAD MAGIC NUMBER\n",
cg);
baseblk = dtogd(sblock, i + j);
for (k = 0; k < frags; k++) {
setbmap(i + j + k);
clrbit(cg_blksfree(cgp, 0), 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(daddr_t blkno, long frags)
{
struct inodesc idesc;
idesc.id_blkno = blkno;
idesc.id_numfrags = frags;
(void)pass4check(&idesc);
}
/*
* Find a pathname
*/
void
getpathname(char *namebuf, size_t namebuflen, ino_t curdir, ino_t ino)
{
int len;
char *cp;
struct inodesc idesc;
static int busy = 0;
struct inostat *info;
if (curdir == ino && ino == ROOTINO) {
(void)strlcpy(namebuf, "/", namebuflen);
return;
}
info = inoinfo(curdir);
if (busy || (info->ino_state != DSTATE && info->ino_state != DFOUND)) {
(void)strlcpy(namebuf, "?", namebuflen);
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 = "..";
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[FFS_MAXNAMLEN])
break;
ino = idesc.id_number;
}
busy = 0;
if (ino != ROOTINO)
*--cp = '?';
memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
}
void
catch(int sig)
{
if (!doinglevel2) {
markclean = 0;
ckfini();
}
exit(FSCK_EXIT_SIGNALLED);
}
/*
* When preening, allow a single quit to signal
* a special exit after filesystem checks complete
* so that reboot sequence may be interrupted.
*/
void
catchquit(int sig)
{
int errsave = errno;
printf("returning to single-user after file system check\n");
returntosingle = 1;
(void)signal(SIGQUIT, SIG_DFL);
errno = errsave;
}
/*
* Ignore a single quit signal; wait and flush just in case.
* Used by child processes in preen.
*/
void
voidquit(int sig)
{
int errsave = errno;
sleep(1);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGQUIT, SIG_DFL);
errno = errsave;
}
/*
* 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:
errexit("UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
}
/* NOTREACHED */
return (0);
}
void
copyback_cg(struct bufarea *blk)
{
memcpy(blk->b_un.b_cg, cgrp, sblock->fs_cgsize);
if (needswap)
ffs_cg_swap(cgrp, blk->b_un.b_cg, sblock);
}
void
infohandler(int sig)
{
got_siginfo = 1;
}
/*
* 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)
errexit("inoinfo: inumber %llu out of range",
(unsigned long long)inum);
ilp = &inostathead[inum / sblock->fs_ipg];
iloff = inum % sblock->fs_ipg;
if (iloff >= ilp->il_numalloced)
return (&unallocated);
return (&ilp->il_stat[iloff]);
}
void
sb_oldfscompat_read(struct fs *fs, struct fs **fssave)
{
if ((fs->fs_magic != FS_UFS1_MAGIC) ||
(fs->fs_old_flags & FS_FLAGS_UPDATED))
return;
/* Save a copy of fields that may be modified for compatibility */
if (fssave) {
if (!*fssave)
*fssave = malloc(sizeof(struct fs));
if (!*fssave)
errexit("cannot allocate space for compat store");
memmove(*fssave, fs, sizeof(struct fs));
if (debug)
printf("detected ufs1 superblock not yet updated for ufs2 kernels\n");
if (doswap) {
uint16_t postbl[256];
int i, n;
if (fs->fs_old_postblformat == FS_42POSTBLFMT)
n = 256;
else
n = 128;
/* extract the postbl from the unswapped superblock */
if (!needswap)
ffs_sb_swap(*fssave, *fssave);
memmove(postbl, (&(*fssave)->fs_old_postbl_start),
n * sizeof(postbl[0]));
if (!needswap)
ffs_sb_swap(*fssave, *fssave);
/* Now swap it */
for (i=0; i < n; i++)
postbl[i] = bswap16(postbl[i]);
/* And put it back such that it will get correctly
* unscrambled if it is swapped again on the way out
*/
if (needswap)
ffs_sb_swap(*fssave, *fssave);
memmove((&(*fssave)->fs_old_postbl_start), postbl,
n * sizeof(postbl[0]));
if (needswap)
ffs_sb_swap(*fssave, *fssave);
}
}
/* These fields will be overwritten by their
* original values in fs_oldfscompat_write, so it is harmless
* to modify them here.
*/
fs->fs_cstotal.cs_ndir =
fs->fs_old_cstotal.cs_ndir;
fs->fs_cstotal.cs_nbfree =
fs->fs_old_cstotal.cs_nbfree;
fs->fs_cstotal.cs_nifree =
fs->fs_old_cstotal.cs_nifree;
fs->fs_cstotal.cs_nffree =
fs->fs_old_cstotal.cs_nffree;
fs->fs_maxbsize = fs->fs_bsize;
fs->fs_time = fs->fs_old_time;
fs->fs_size = fs->fs_old_size;
fs->fs_dsize = fs->fs_old_dsize;
fs->fs_csaddr = fs->fs_old_csaddr;
fs->fs_sblockloc = SBLOCK_UFS1;
fs->fs_flags = fs->fs_old_flags;
if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
fs->fs_old_nrpos = 8;
fs->fs_old_npsect = fs->fs_old_nsect;
fs->fs_old_interleave = 1;
fs->fs_old_trackskew = 0;
}
}
void
sb_oldfscompat_write(struct fs *fs, struct fs *fssave)
{
if ((fs->fs_magic != FS_UFS1_MAGIC) ||
(fs->fs_old_flags & FS_FLAGS_UPDATED))
return;
fs->fs_old_flags = fs->fs_flags;
fs->fs_old_time = fs->fs_time;
fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;
fs->fs_flags = fssave->fs_flags;
if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
fs->fs_old_nrpos = fssave->fs_old_nrpos;
fs->fs_old_npsect = fssave->fs_old_npsect;
fs->fs_old_interleave = fssave->fs_old_interleave;
fs->fs_old_trackskew = fssave->fs_old_trackskew;
}
memmove(&fs->fs_old_postbl_start, &fssave->fs_old_postbl_start,
((fs->fs_old_postblformat == FS_42POSTBLFMT) ?
512 : 256));
}
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