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freebsd-nq/sbin/fsck_ffs/fsutil.c
Robert Wing 20123b25ee fsck_ffs(8): fix divide by zero when debug messages are enabled 
Only print buffer cache debug message when a cache lookup has been done.

When running `fsck_ffs -d` on a gjournal'ed filesystem, it's possible
that totalreads is greater than zero when no cache lookup has been
done - causing a divide by zero. This commit fixes the following error:

    Floating point exception (core dumped)

Reviewed by:    mckusick
Differential Revision:  https://reviews.freebsd.org/D30370
2021-05-22 11:03:36 -08:00

1336 lines
32 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#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("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/stat.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 <time.h>
#include <unistd.h>
#include <libufs.h>
#include "fsck.h"
int sujrecovery = 0;
static struct bufarea *allocbuf(const char *);
static void cg_write(struct bufarea *);
static void slowio_start(void);
static void slowio_end(void);
static void printIOstats(void);
static void prtbuf(const char *, struct bufarea *);
static long diskreads, totaldiskreads, totalreads; /* Disk cache statistics */
static struct timespec startpass, finishpass;
struct timeval slowio_starttime;
int slowio_delay_usec = 10000; /* Initial IO delay for background fsck */
int slowio_pollcnt;
static struct bufarea cgblk; /* backup buffer for cylinder group blocks */
static TAILQ_HEAD(bufqueue, bufarea) bufqueuehd; /* head of buffer cache LRU */
static LIST_HEAD(bufhash, bufarea) bufhashhd[HASHSIZE]; /* buffer hash list */
static int numbufs; /* size of buffer cache */
static int cachelookups; /* number of cache lookups */
static int cachereads; /* number of cache reads */
static int flushtries; /* number of tries to reclaim memory */
char *buftype[BT_NUMBUFTYPES] = BT_NAMES;
void
fsutilinit(void)
{
diskreads = totaldiskreads = totalreads = 0;
bzero(&startpass, sizeof(struct timespec));
bzero(&finishpass, sizeof(struct timespec));
bzero(&slowio_starttime, sizeof(struct timeval));
slowio_delay_usec = 10000;
slowio_pollcnt = 0;
flushtries = 0;
}
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 %ju out of range",
(uintmax_t)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)
{
int i;
if ((cgblk.b_un.b_buf = Malloc((unsigned int)sblock.fs_bsize)) == NULL)
errx(EEXIT, "Initial malloc(%d) failed", sblock.fs_bsize);
initbarea(&cgblk, BT_CYLGRP);
numbufs = cachelookups = cachereads = 0;
TAILQ_INIT(&bufqueuehd);
for (i = 0; i < HASHSIZE; i++)
LIST_INIT(&bufhashhd[i]);
for (i = 0; i < BT_NUMBUFTYPES; i++) {
readtime[i].tv_sec = totalreadtime[i].tv_sec = 0;
readtime[i].tv_nsec = totalreadtime[i].tv_nsec = 0;
readcnt[i] = totalreadcnt[i] = 0;
}
}
static struct bufarea *
allocbuf(const char *failreason)
{
struct bufarea *bp;
char *bufp;
bp = (struct bufarea *)Malloc(sizeof(struct bufarea));
bufp = Malloc((unsigned int)sblock.fs_bsize);
if (bp == NULL || bufp == NULL) {
errx(EEXIT, "%s", failreason);
/* NOTREACHED */
}
numbufs++;
bp->b_un.b_buf = bufp;
TAILQ_INSERT_HEAD(&bufqueuehd, bp, b_list);
initbarea(bp, BT_UNKNOWN);
return (bp);
}
/*
* Manage cylinder group buffers.
*
* Use getblk() here rather than cgget() because the cylinder group
* may be corrupted but we want it anyway so we can fix it.
*/
static struct bufarea *cgbufs; /* header for cylinder group cache */
static int flushtries; /* number of tries to reclaim memory */
struct bufarea *
cglookup(int cg)
{
struct bufarea *cgbp;
struct cg *cgp;
if ((unsigned) cg >= sblock.fs_ncg)
errx(EEXIT, "cglookup: out of range cylinder group %d", cg);
if (cgbufs == NULL) {
cgbufs = calloc(sblock.fs_ncg, sizeof(struct bufarea));
if (cgbufs == NULL)
errx(EEXIT, "Cannot allocate cylinder group buffers");
}
cgbp = &cgbufs[cg];
if (cgbp->b_un.b_cg != NULL)
return (cgbp);
cgp = NULL;
if (flushtries == 0)
cgp = Malloc((unsigned int)sblock.fs_cgsize);
if (cgp == NULL) {
if (sujrecovery)
errx(EEXIT,"Ran out of memory during journal recovery");
getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
return (&cgblk);
}
cgbp->b_un.b_cg = cgp;
initbarea(cgbp, BT_CYLGRP);
getblk(cgbp, cgtod(&sblock, cg), sblock.fs_cgsize);
return (cgbp);
}
/*
* Mark a cylinder group buffer as dirty.
* Update its check-hash if they are enabled.
*/
void
cgdirty(struct bufarea *cgbp)
{
struct cg *cg;
cg = cgbp->b_un.b_cg;
if ((sblock.fs_metackhash & CK_CYLGRP) != 0) {
cg->cg_ckhash = 0;
cg->cg_ckhash =
calculate_crc32c(~0L, (void *)cg, sblock.fs_cgsize);
}
dirty(cgbp);
}
/*
* Attempt to flush a cylinder group cache entry.
* Return whether the flush was successful.
*/
int
flushentry(void)
{
struct bufarea *cgbp;
if (sujrecovery || flushtries == sblock.fs_ncg || cgbufs == NULL)
return (0);
cgbp = &cgbufs[flushtries++];
if (cgbp->b_un.b_cg == NULL)
return (0);
flush(fswritefd, cgbp);
free(cgbp->b_un.b_buf);
cgbp->b_un.b_buf = NULL;
return (1);
}
/*
* Manage a cache of directory blocks.
*/
struct bufarea *
getdatablk(ufs2_daddr_t blkno, long size, int type)
{
struct bufarea *bp;
struct bufhash *bhdp;
cachelookups++;
/* If out of range, return empty buffer with b_err == -1 */
if (type != BT_INODES && chkrange(blkno, size / sblock.fs_fsize)) {
blkno = -1;
type = BT_EMPTY;
}
bhdp = &bufhashhd[HASH(blkno)];
LIST_FOREACH(bp, bhdp, b_hash)
if (bp->b_bno == fsbtodb(&sblock, blkno)) {
if (debug && bp->b_size != size) {
prtbuf("getdatablk: size mismatch", bp);
pfatal("getdatablk: b_size %d != size %ld\n",
bp->b_size, size);
}
goto foundit;
}
/*
* Move long-term busy buffer back to the front of the LRU so we
* do not endless inspect them for recycling.
*/
bp = TAILQ_LAST(&bufqueuehd, bufqueue);
if (bp != NULL && bp->b_refcnt != 0) {
TAILQ_REMOVE(&bufqueuehd, bp, b_list);
TAILQ_INSERT_HEAD(&bufqueuehd, bp, b_list);
}
/*
* Allocate up to the minimum number of buffers before
* considering recycling any of them.
*/
if (size > sblock.fs_bsize)
errx(EEXIT, "Excessive buffer size %ld > %d\n", size,
sblock.fs_bsize);
if (numbufs < MINBUFS) {
bp = allocbuf("cannot create minimal buffer pool");
} else if (sujrecovery) {
/*
* SUJ recovery does not want anything written until it
* has successfully completed (so it can fail back to
* full fsck). Thus, we can only recycle clean buffers.
*/
TAILQ_FOREACH_REVERSE(bp, &bufqueuehd, bufqueue, b_list)
if ((bp->b_flags & B_DIRTY) == 0 && bp->b_refcnt == 0)
break;
if (bp == NULL)
bp = allocbuf("Ran out of memory during "
"journal recovery");
else
LIST_REMOVE(bp, b_hash);
} else {
/*
* Recycle oldest non-busy buffer.
*/
TAILQ_FOREACH_REVERSE(bp, &bufqueuehd, bufqueue, b_list)
if (bp->b_refcnt == 0)
break;
if (bp == NULL)
bp = allocbuf("Ran out of memory for buffers");
else
LIST_REMOVE(bp, b_hash);
}
flush(fswritefd, bp);
bp->b_type = type;
LIST_INSERT_HEAD(bhdp, bp, b_hash);
getblk(bp, blkno, size);
cachereads++;
/* fall through */
foundit:
if (debug && bp->b_type != type) {
printf("getdatablk: buffer type changed to %s",
BT_BUFTYPE(type));
prtbuf("", bp);
}
TAILQ_REMOVE(&bufqueuehd, bp, b_list);
TAILQ_INSERT_HEAD(&bufqueuehd, bp, b_list);
if (bp->b_errs == 0)
bp->b_refcnt++;
return (bp);
}
void
getblk(struct bufarea *bp, ufs2_daddr_t blk, long size)
{
ufs2_daddr_t dblk;
struct timespec start, finish;
dblk = fsbtodb(&sblock, blk);
if (bp->b_bno == dblk) {
totalreads++;
} else {
if (debug) {
readcnt[bp->b_type]++;
clock_gettime(CLOCK_REALTIME_PRECISE, &start);
}
if (bp->b_type != BT_EMPTY)
bp->b_errs =
blread(fsreadfd, bp->b_un.b_buf, dblk, size);
else
bp->b_errs = -1;
if (debug) {
clock_gettime(CLOCK_REALTIME_PRECISE, &finish);
timespecsub(&finish, &start, &finish);
timespecadd(&readtime[bp->b_type], &finish,
&readtime[bp->b_type]);
}
bp->b_bno = dblk;
bp->b_size = size;
}
}
void
brelse(struct bufarea *bp)
{
if (bp->b_refcnt <= 0)
prtbuf("brelse: buffer with negative reference count", bp);
bp->b_refcnt--;
}
void
flush(int fd, struct bufarea *bp)
{
struct inode ip;
if ((bp->b_flags & B_DIRTY) == 0)
return;
bp->b_flags &= ~B_DIRTY;
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;
/*
* Write using the appropriate function.
*/
switch (bp->b_type) {
case BT_SUPERBLK:
if (bp != &sblk)
pfatal("BUFFER %p DOES NOT MATCH SBLK %p\n",
bp, &sblk);
if (sbput(fd, bp->b_un.b_fs, 0) == 0)
fsmodified = 1;
break;
case BT_CYLGRP:
if (sujrecovery)
cg_write(bp);
if (cgput(fswritefd, &sblock, bp->b_un.b_cg) == 0)
fsmodified = 1;
break;
case BT_INODES:
if (debug && sblock.fs_magic == FS_UFS2_MAGIC) {
struct ufs2_dinode *dp = bp->b_un.b_dinode2;
int i;
for (i = 0; i < INOPB(&sblock); dp++, i++) {
if (ffs_verify_dinode_ckhash(&sblock, dp) == 0)
continue;
pwarn("flush: INODE CHECK-HASH FAILED");
ip.i_bp = bp;
ip.i_dp = (union dinode *)dp;
ip.i_number = bp->b_index + i;
prtinode(&ip);
if (preen || reply("FIX") != 0) {
if (preen)
printf(" (FIXED)\n");
ffs_update_dinode_ckhash(&sblock, dp);
inodirty(&ip);
}
}
}
/* FALLTHROUGH */
default:
blwrite(fd, bp->b_un.b_buf, bp->b_bno, bp->b_size);
break;
}
}
/*
* Journaled soft updates does not maintain cylinder group summary
* information during cleanup, so this routine recalculates the summary
* information and updates the superblock summary in preparation for
* writing out the cylinder group.
*/
static void
cg_write(struct bufarea *bp)
{
ufs1_daddr_t fragno, cgbno, maxbno;
u_int8_t *blksfree;
struct cg *cgp;
int blk;
int i;
/*
* Fix the frag and cluster summary.
*/
cgp = bp->b_un.b_cg;
cgp->cg_cs.cs_nbfree = 0;
cgp->cg_cs.cs_nffree = 0;
bzero(&cgp->cg_frsum, sizeof(cgp->cg_frsum));
maxbno = fragstoblks(&sblock, sblock.fs_fpg);
if (sblock.fs_contigsumsize > 0) {
for (i = 1; i <= sblock.fs_contigsumsize; i++)
cg_clustersum(cgp)[i] = 0;
bzero(cg_clustersfree(cgp), howmany(maxbno, CHAR_BIT));
}
blksfree = cg_blksfree(cgp);
for (cgbno = 0; cgbno < maxbno; cgbno++) {
if (ffs_isfreeblock(&sblock, blksfree, cgbno))
continue;
if (ffs_isblock(&sblock, blksfree, cgbno)) {
ffs_clusteracct(&sblock, cgp, cgbno, 1);
cgp->cg_cs.cs_nbfree++;
continue;
}
fragno = blkstofrags(&sblock, cgbno);
blk = blkmap(&sblock, blksfree, fragno);
ffs_fragacct(&sblock, blk, cgp->cg_frsum, 1);
for (i = 0; i < sblock.fs_frag; i++)
if (isset(blksfree, fragno + i))
cgp->cg_cs.cs_nffree++;
}
/*
* Update the superblock cg summary from our now correct values
* before writing the block.
*/
sblock.fs_cs(&sblock, cgp->cg_cgx) = cgp->cg_cs;
}
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;
struct inoinfo *inp, *ninp;
int ofsmodified, cnt, cg, i;
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 (debug && cachelookups > 0)
printf("cache with %d buffers missed %d of %d (%d%%)\n",
numbufs, cachereads, cachelookups,
(int)(cachereads * 100 / cachelookups));
if (fswritefd < 0) {
(void)close(fsreadfd);
return;
}
/*
* To remain idempotent with partial truncations the buffers
* must be flushed in this order:
* 1) cylinder groups (bitmaps)
* 2) indirect, directory, external attribute, and data blocks
* 3) inode blocks
* 4) superblock
* This ordering preserves access to the modified pointers
* until they are freed.
*/
/* Step 1: cylinder groups */
if (debug)
printf("Flush Cylinder groups\n");
if (cgbufs != NULL) {
for (cnt = 0; cnt < sblock.fs_ncg; cnt++) {
if (cgbufs[cnt].b_un.b_cg == NULL)
continue;
flush(fswritefd, &cgbufs[cnt]);
free(cgbufs[cnt].b_un.b_cg);
}
free(cgbufs);
cgbufs = NULL;
}
flush(fswritefd, &cgblk);
free(cgblk.b_un.b_buf);
cgblk.b_un.b_buf = NULL;
cnt = 0;
/* Step 2: indirect, directory, external attribute, and data blocks */
if (debug)
printf("Flush indirect, directory, external attribute, "
"and data blocks\n");
if (pdirbp != NULL) {
brelse(pdirbp);
pdirbp = NULL;
}
TAILQ_FOREACH_REVERSE_SAFE(bp, &bufqueuehd, bufqueue, b_list, nbp) {
switch (bp->b_type) {
/* These should not be in the buffer cache list */
case BT_UNKNOWN:
case BT_SUPERBLK:
case BT_CYLGRP:
default:
prtbuf("ckfini: improper buffer type on cache list",bp);
continue;
/* These are the ones to flush in this step */
case BT_EMPTY:
if (bp->b_bno >= 0)
pfatal("Unused BT_EMPTY buffer for block %jd\n",
(intmax_t)bp->b_bno);
/* FALLTHROUGH */
case BT_LEVEL1:
case BT_LEVEL2:
case BT_LEVEL3:
case BT_EXTATTR:
case BT_DIRDATA:
case BT_DATA:
break;
/* These are the ones to flush in the next step */
case BT_INODES:
continue;
}
if (debug && bp->b_refcnt != 0) {
prtbuf("ckfini: clearing in-use buffer", bp);
pfatal("ckfini: clearing in-use buffer\n");
}
TAILQ_REMOVE(&bufqueuehd, bp, b_list);
cnt++;
flush(fswritefd, bp);
free(bp->b_un.b_buf);
free((char *)bp);
}
/* Step 3: inode blocks */
if (debug)
printf("Flush inode blocks\n");
if (icachebp != NULL) {
brelse(icachebp);
icachebp = NULL;
}
TAILQ_FOREACH_REVERSE_SAFE(bp, &bufqueuehd, bufqueue, b_list, nbp) {
if (debug && bp->b_refcnt != 0) {
prtbuf("ckfini: clearing in-use buffer", bp);
pfatal("ckfini: clearing in-use buffer\n");
}
TAILQ_REMOVE(&bufqueuehd, bp, b_list);
cnt++;
flush(fswritefd, bp);
free(bp->b_un.b_buf);
free((char *)bp);
}
if (numbufs != cnt)
errx(EEXIT, "panic: lost %d buffers", numbufs - cnt);
/* Step 4: superblock */
if (debug)
printf("Flush the superblock\n");
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")) {
/* Change the write destination to standard superblock */
sblock.fs_sblockactualloc = sblock.fs_sblockloc;
sblk.b_bno = sblock.fs_sblockloc / dev_bsize;
sbdirty();
flush(fswritefd, &sblk);
}
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) {
if (markclean) {
printf("\n***** FILE SYSTEM IS CLEAN *****\n");
} else {
printf("\n***** FILE SYSTEM STILL DIRTY *****\n");
rerun = 1;
}
}
/*
* Free allocated tracking structures.
*/
if (blockmap != NULL)
free(blockmap);
blockmap = NULL;
if (inostathead != NULL) {
for (cg = 0; cg < sblock.fs_ncg; cg++)
if (inostathead[cg].il_stat != NULL)
free((char *)inostathead[cg].il_stat);
free(inostathead);
}
inostathead = NULL;
if (inpsort != NULL)
free(inpsort);
inpsort = NULL;
if (inphead != NULL) {
for (i = 0; i < dirhash; i++) {
for (inp = inphead[i]; inp != NULL; inp = ninp) {
ninp = inp->i_nexthash;
free(inp);
}
}
free(inphead);
}
inphead = NULL;
finalIOstats();
(void)close(fsreadfd);
(void)close(fswritefd);
}
/*
* Print out I/O statistics.
*/
void
IOstats(char *what)
{
int i;
if (debug == 0)
return;
if (diskreads == 0) {
printf("%s: no I/O\n\n", what);
return;
}
if (startpass.tv_sec == 0)
startpass = startprog;
printf("%s: I/O statistics\n", what);
printIOstats();
totaldiskreads += diskreads;
diskreads = 0;
for (i = 0; i < BT_NUMBUFTYPES; i++) {
timespecadd(&totalreadtime[i], &readtime[i], &totalreadtime[i]);
totalreadcnt[i] += readcnt[i];
readtime[i].tv_sec = readtime[i].tv_nsec = 0;
readcnt[i] = 0;
}
clock_gettime(CLOCK_REALTIME_PRECISE, &startpass);
}
void
finalIOstats(void)
{
int i;
if (debug == 0)
return;
printf("Final I/O statistics\n");
totaldiskreads += diskreads;
diskreads = totaldiskreads;
startpass = startprog;
for (i = 0; i < BT_NUMBUFTYPES; i++) {
timespecadd(&totalreadtime[i], &readtime[i], &totalreadtime[i]);
totalreadcnt[i] += readcnt[i];
readtime[i] = totalreadtime[i];
readcnt[i] = totalreadcnt[i];
}
printIOstats();
}
static void printIOstats(void)
{
long long msec, totalmsec;
int i;
clock_gettime(CLOCK_REALTIME_PRECISE, &finishpass);
timespecsub(&finishpass, &startpass, &finishpass);
printf("Running time: %jd.%03ld sec\n",
(intmax_t)finishpass.tv_sec, finishpass.tv_nsec / 1000000);
printf("buffer reads by type:\n");
for (totalmsec = 0, i = 0; i < BT_NUMBUFTYPES; i++)
totalmsec += readtime[i].tv_sec * 1000 +
readtime[i].tv_nsec / 1000000;
if (totalmsec == 0)
totalmsec = 1;
for (i = 0; i < BT_NUMBUFTYPES; i++) {
if (readcnt[i] == 0)
continue;
msec =
readtime[i].tv_sec * 1000 + readtime[i].tv_nsec / 1000000;
printf("%21s:%8ld %2ld.%ld%% %4jd.%03ld sec %2lld.%lld%%\n",
buftype[i], readcnt[i], readcnt[i] * 100 / diskreads,
(readcnt[i] * 1000 / diskreads) % 10,
(intmax_t)readtime[i].tv_sec, readtime[i].tv_nsec / 1000000,
msec * 100 / totalmsec, (msec * 1000 / totalmsec) % 10);
}
printf("\n");
}
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();
totalreads++;
diskreads++;
if (pread(fd, buf, (int)size, offset) == size) {
if (bkgrdflag)
slowio_end();
return (0);
}
/*
* This is handled specially here instead of in rwerror because
* rwerror is used for all sorts of errors, not just true read/write
* errors. It should be refactored and fixed.
*/
if (surrender) {
pfatal("CANNOT READ_BLK: %ld", (long)blk);
errx(EEXIT, "ABORTING DUE TO READ ERRORS");
} else
rwerror("READ 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 (pread(fd, cp, (int)secsize, offset + i) != secsize) {
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, ssize_t size)
{
int i;
char *cp;
off_t offset;
if (fd < 0)
return;
offset = blk;
offset *= dev_bsize;
if (pwrite(fd, buf, size, offset) == size) {
fsmodified = 1;
return;
}
resolved = 0;
rwerror("WRITE BLK", 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, dev_bsize, offset + i) != dev_bsize)
printf(" %jd,", (intmax_t)blk + i / dev_bsize);
printf("\n");
return;
}
void
blerase(int fd, ufs2_daddr_t blk, long size)
{
off_t ioarg[2];
if (fd < 0)
return;
ioarg[0] = blk * dev_bsize;
ioarg[1] = size;
ioctl(fd, DIOCGDELETE, ioarg);
/* we don't really care if we succeed or not */
return;
}
/*
* Fill a contiguous region with all-zeroes. Note ZEROBUFSIZE is by
* definition a multiple of dev_bsize.
*/
void
blzero(int fd, ufs2_daddr_t blk, long size)
{
static char *zero;
off_t offset, len;
if (fd < 0)
return;
if (zero == NULL) {
zero = calloc(ZEROBUFSIZE, 1);
if (zero == NULL)
errx(EEXIT, "cannot allocate buffer pool");
}
offset = blk * dev_bsize;
if (lseek(fd, offset, 0) < 0)
rwerror("SEEK BLK", blk);
while (size > 0) {
len = MIN(ZEROBUFSIZE, size);
if (write(fd, zero, len) != len)
rwerror("WRITE BLK", blk);
blk += len / dev_bsize;
size -= len;
}
}
/*
* Verify cylinder group's magic number and other parameters. If the
* test fails, offer an option to rebuild the whole cylinder group.
*/
int
check_cgmagic(int cg, struct bufarea *cgbp, int request_rebuild)
{
struct cg *cgp = cgbp->b_un.b_cg;
uint32_t cghash, calchash;
static int prevfailcg = -1;
/*
* Extended cylinder group checks.
*/
calchash = cgp->cg_ckhash;
if ((sblock.fs_metackhash & CK_CYLGRP) != 0 &&
(ckhashadd & CK_CYLGRP) == 0) {
cghash = cgp->cg_ckhash;
cgp->cg_ckhash = 0;
calchash = calculate_crc32c(~0L, (void *)cgp, sblock.fs_cgsize);
cgp->cg_ckhash = cghash;
}
if (cgp->cg_ckhash == calchash &&
cg_chkmagic(cgp) &&
cgp->cg_cgx == cg &&
((sblock.fs_magic == FS_UFS1_MAGIC &&
cgp->cg_old_niblk == sblock.fs_ipg &&
cgp->cg_ndblk <= sblock.fs_fpg &&
cgp->cg_old_ncyl <= sblock.fs_old_cpg) ||
(sblock.fs_magic == FS_UFS2_MAGIC &&
cgp->cg_niblk == sblock.fs_ipg &&
cgp->cg_ndblk <= sblock.fs_fpg &&
cgp->cg_initediblk <= sblock.fs_ipg))) {
return (1);
}
if (prevfailcg == cg)
return (0);
prevfailcg = cg;
pfatal("CYLINDER GROUP %d: INTEGRITY CHECK FAILED", cg);
if (!request_rebuild) {
printf("\n");
return (0);
}
if (!reply("REBUILD CYLINDER GROUP")) {
printf("YOU WILL NEED TO RERUN FSCK.\n");
rerun = 1;
return (1);
}
/*
* Zero out the cylinder group and then initialize critical fields.
* Bit maps and summaries will be recalculated by later passes.
*/
memset(cgp, 0, (size_t)sblock.fs_cgsize);
cgp->cg_magic = CG_MAGIC;
cgp->cg_cgx = cg;
cgp->cg_niblk = sblock.fs_ipg;
cgp->cg_initediblk = MIN(sblock.fs_ipg, 2 * INOPB(&sblock));
if (cgbase(&sblock, cg) + sblock.fs_fpg < sblock.fs_size)
cgp->cg_ndblk = sblock.fs_fpg;
else
cgp->cg_ndblk = sblock.fs_size - cgbase(&sblock, cg);
cgp->cg_iusedoff = &cgp->cg_space[0] - (u_char *)(&cgp->cg_firstfield);
if (sblock.fs_magic == FS_UFS1_MAGIC) {
cgp->cg_niblk = 0;
cgp->cg_initediblk = 0;
cgp->cg_old_ncyl = sblock.fs_old_cpg;
cgp->cg_old_niblk = sblock.fs_ipg;
cgp->cg_old_btotoff = cgp->cg_iusedoff;
cgp->cg_old_boff = cgp->cg_old_btotoff +
sblock.fs_old_cpg * sizeof(int32_t);
cgp->cg_iusedoff = cgp->cg_old_boff +
sblock.fs_old_cpg * sizeof(u_int16_t);
}
cgp->cg_freeoff = cgp->cg_iusedoff + howmany(sblock.fs_ipg, CHAR_BIT);
cgp->cg_nextfreeoff = cgp->cg_freeoff + howmany(sblock.fs_fpg,CHAR_BIT);
if (sblock.fs_contigsumsize > 0) {
cgp->cg_nclusterblks = cgp->cg_ndblk / sblock.fs_frag;
cgp->cg_clustersumoff =
roundup(cgp->cg_nextfreeoff, sizeof(u_int32_t));
cgp->cg_clustersumoff -= sizeof(u_int32_t);
cgp->cg_clusteroff = cgp->cg_clustersumoff +
(sblock.fs_contigsumsize + 1) * sizeof(u_int32_t);
cgp->cg_nextfreeoff = cgp->cg_clusteroff +
howmany(fragstoblks(&sblock, sblock.fs_fpg), CHAR_BIT);
}
cgdirty(cgbp);
return (0);
}
/*
* allocate a data block with the specified number of fragments
*/
ufs2_daddr_t
allocblk(long frags)
{
int i, j, k, cg, baseblk;
struct bufarea *cgbp;
struct cg *cgp;
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);
cgbp = cglookup(cg);
cgp = cgbp->b_un.b_cg;
if (!check_cgmagic(cg, cgbp, 0)) {
i = (cg + 1) * sblock.fs_fpg - sblock.fs_frag;
continue;
}
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(cgbp);
return (i + j);
}
}
return (0);
}
/*
* 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 inode ip;
struct inodesc idesc;
static int busy = 0;
if (curdir == ino && ino == UFS_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 != UFS_ROOTINO) {
idesc.id_number = ino;
idesc.id_func = findino;
idesc.id_name = strdup("..");
ginode(ino, &ip);
if ((ckinode(ip.i_dp, &idesc) & FOUND) == 0) {
irelse(&ip);
break;
}
irelse(&ip);
namelookup:
idesc.id_number = idesc.id_parent;
idesc.id_parent = ino;
idesc.id_func = findname;
idesc.id_name = namebuf;
ginode(idesc.id_number, &ip);
if ((ckinode(ip.i_dp, &idesc) & FOUND) == 0) {
irelse(&ip);
break;
}
irelse(&ip);
len = strlen(namebuf);
cp -= len;
memmove(cp, namebuf, (size_t)len);
*--cp = '/';
if (cp < &namebuf[UFS_MAXNAMLEN])
break;
ino = idesc.id_number;
}
busy = 0;
if (ino != UFS_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>
/*
* Print details about a buffer.
*/
static void
prtbuf(const char *msg, struct bufarea *bp)
{
printf("%s: bp %p, type %s, bno %jd, size %d, refcnt %d, flags %s, "
"index %jd\n", msg, bp, BT_BUFTYPE(bp->b_type), (intmax_t) bp->b_bno,
bp->b_size, bp->b_refcnt, bp->b_flags & B_DIRTY ? "dirty" : "clean",
(intmax_t) bp->b_index);
}
/*
* An unexpected inconsistency occurred.
* 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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