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freebsd/sbin/fsck_ffs/inode.c
Don Lewis af6726e657 Eliminate linked list used to track inodes with an initial link 
count of zero and instead encode this information in the inode state.
Pass 4 performed a linear search of this list for each inode in
the file system, which performs poorly if the list is long.

Reviewed by:    sam & keramida (an earlier version of the patch), mckusick
MFC after:	1 month
2004-10-08 20:44:47 +00:00

679 lines
17 KiB
C
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/*
* 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[] = "@(#)inode.c 8.8 (Berkeley) 4/28/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stdint.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <err.h>
#include <pwd.h>
#include <string.h>
#include "fsck.h"
static ino_t startinum;
static int iblock(struct inodesc *, long ilevel, off_t isize);
int
ckinode(union dinode *dp, struct inodesc *idesc)
{
off_t remsize, sizepb;
int i, offset, ret;
union dinode dino;
ufs2_daddr_t ndb;
mode_t mode;
char pathbuf[MAXPATHLEN + 1];
if (idesc->id_fix != IGNORE)
idesc->id_fix = DONTKNOW;
idesc->id_lbn = -1;
idesc->id_entryno = 0;
idesc->id_filesize = DIP(dp, di_size);
mode = DIP(dp, di_mode) & IFMT;
if (mode == IFBLK || mode == IFCHR || (mode == IFLNK &&
DIP(dp, di_size) < (unsigned)sblock.fs_maxsymlinklen))
return (KEEPON);
if (sblock.fs_magic == FS_UFS1_MAGIC)
dino.dp1 = dp->dp1;
else
dino.dp2 = dp->dp2;
ndb = howmany(DIP(&dino, di_size), sblock.fs_bsize);
for (i = 0; i < NDADDR; i++) {
idesc->id_lbn++;
if (--ndb == 0 &&
(offset = blkoff(&sblock, DIP(&dino, di_size))) != 0)
idesc->id_numfrags =
numfrags(&sblock, fragroundup(&sblock, offset));
else
idesc->id_numfrags = sblock.fs_frag;
if (DIP(&dino, di_db[i]) == 0) {
if (idesc->id_type == DATA && ndb >= 0) {
/* An empty block in a directory XXX */
getpathname(pathbuf, idesc->id_number,
idesc->id_number);
pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS",
pathbuf);
if (reply("ADJUST LENGTH") == 1) {
dp = ginode(idesc->id_number);
DIP_SET(dp, di_size,
i * sblock.fs_bsize);
printf(
"YOU MUST RERUN FSCK AFTERWARDS\n");
rerun = 1;
inodirty();
}
}
continue;
}
idesc->id_blkno = DIP(&dino, di_db[i]);
if (idesc->id_type != DATA)
ret = (*idesc->id_func)(idesc);
else
ret = dirscan(idesc);
if (ret & STOP)
return (ret);
}
idesc->id_numfrags = sblock.fs_frag;
remsize = DIP(&dino, di_size) - sblock.fs_bsize * NDADDR;
sizepb = sblock.fs_bsize;
for (i = 0; i < NIADDR; i++) {
sizepb *= NINDIR(&sblock);
if (DIP(&dino, di_ib[i])) {
idesc->id_blkno = DIP(&dino, di_ib[i]);
ret = iblock(idesc, i + 1, remsize);
if (ret & STOP)
return (ret);
} else {
idesc->id_lbn += sizepb / sblock.fs_bsize;
if (idesc->id_type == DATA && remsize > 0) {
/* An empty block in a directory XXX */
getpathname(pathbuf, idesc->id_number,
idesc->id_number);
pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS",
pathbuf);
if (reply("ADJUST LENGTH") == 1) {
dp = ginode(idesc->id_number);
DIP_SET(dp, di_size,
DIP(dp, di_size) - remsize);
remsize = 0;
printf(
"YOU MUST RERUN FSCK AFTERWARDS\n");
rerun = 1;
inodirty();
break;
}
}
}
remsize -= sizepb;
}
return (KEEPON);
}
static int
iblock(struct inodesc *idesc, long ilevel, off_t isize)
{
struct bufarea *bp;
int i, n, (*func)(struct inodesc *), nif;
off_t sizepb;
char buf[BUFSIZ];
char pathbuf[MAXPATHLEN + 1];
union dinode *dp;
if (idesc->id_type != DATA) {
func = idesc->id_func;
if (((n = (*func)(idesc)) & KEEPON) == 0)
return (n);
} else
func = dirscan;
if (chkrange(idesc->id_blkno, idesc->id_numfrags))
return (SKIP);
bp = getdatablk(idesc->id_blkno, sblock.fs_bsize);
ilevel--;
for (sizepb = sblock.fs_bsize, i = 0; i < ilevel; i++)
sizepb *= NINDIR(&sblock);
if (howmany(isize, sizepb) > NINDIR(&sblock))
nif = NINDIR(&sblock);
else
nif = howmany(isize, sizepb);
if (idesc->id_func == pass1check && nif < NINDIR(&sblock)) {
for (i = nif; i < NINDIR(&sblock); i++) {
if (IBLK(bp, i) == 0)
continue;
(void)sprintf(buf, "PARTIALLY TRUNCATED INODE I=%lu",
(u_long)idesc->id_number);
if (preen) {
pfatal("%s", buf);
} else if (dofix(idesc, buf)) {
IBLK_SET(bp, i, 0);
dirty(bp);
}
}
flush(fswritefd, bp);
}
for (i = 0; i < nif; i++) {
if (ilevel == 0)
idesc->id_lbn++;
if (IBLK(bp, i)) {
idesc->id_blkno = IBLK(bp, i);
if (ilevel == 0)
n = (*func)(idesc);
else
n = iblock(idesc, ilevel, isize);
if (n & STOP) {
bp->b_flags &= ~B_INUSE;
return (n);
}
} else {
if (idesc->id_type == DATA && isize > 0) {
/* An empty block in a directory XXX */
getpathname(pathbuf, idesc->id_number,
idesc->id_number);
pfatal("DIRECTORY %s: CONTAINS EMPTY BLOCKS",
pathbuf);
if (reply("ADJUST LENGTH") == 1) {
dp = ginode(idesc->id_number);
DIP_SET(dp, di_size,
DIP(dp, di_size) - isize);
isize = 0;
printf(
"YOU MUST RERUN FSCK AFTERWARDS\n");
rerun = 1;
inodirty();
bp->b_flags &= ~B_INUSE;
return(STOP);
}
}
}
isize -= sizepb;
}
bp->b_flags &= ~B_INUSE;
return (KEEPON);
}
/*
* Check that a block in a legal block number.
* Return 0 if in range, 1 if out of range.
*/
int
chkrange(ufs2_daddr_t blk, int cnt)
{
int c;
if (cnt <= 0 || blk <= 0 || blk > maxfsblock ||
cnt - 1 > maxfsblock - blk)
return (1);
if (cnt > sblock.fs_frag ||
fragnum(&sblock, blk) + cnt > sblock.fs_frag) {
if (debug)
printf("bad size: blk %ld, offset %i, size %d\n",
(long)blk, (int)fragnum(&sblock, blk), cnt);
return (1);
}
c = dtog(&sblock, blk);
if (blk < cgdmin(&sblock, c)) {
if ((blk + cnt) > cgsblock(&sblock, c)) {
if (debug) {
printf("blk %ld < cgdmin %ld;",
(long)blk, (long)cgdmin(&sblock, c));
printf(" blk + cnt %ld > cgsbase %ld\n",
(long)(blk + cnt),
(long)cgsblock(&sblock, c));
}
return (1);
}
} else {
if ((blk + cnt) > cgbase(&sblock, c+1)) {
if (debug) {
printf("blk %ld >= cgdmin %ld;",
(long)blk, (long)cgdmin(&sblock, c));
printf(" blk + cnt %ld > sblock.fs_fpg %ld\n",
(long)(blk + cnt), (long)sblock.fs_fpg);
}
return (1);
}
}
return (0);
}
/*
* General purpose interface for reading inodes.
*/
union dinode *
ginode(ino_t inumber)
{
ufs2_daddr_t iblk;
if (inumber < ROOTINO || inumber > maxino)
errx(EEXIT, "bad inode number %d to ginode", inumber);
if (startinum == 0 ||
inumber < startinum || inumber >= startinum + INOPB(&sblock)) {
iblk = ino_to_fsba(&sblock, inumber);
if (pbp != 0)
pbp->b_flags &= ~B_INUSE;
pbp = getdatablk(iblk, sblock.fs_bsize);
startinum = (inumber / INOPB(&sblock)) * INOPB(&sblock);
}
if (sblock.fs_magic == FS_UFS1_MAGIC)
return ((union dinode *)
&pbp->b_un.b_dinode1[inumber % INOPB(&sblock)]);
return ((union dinode *)&pbp->b_un.b_dinode2[inumber % INOPB(&sblock)]);
}
/*
* Special purpose version of ginode used to optimize first pass
* over all the inodes in numerical order.
*/
static ino_t nextino, lastinum, lastvalidinum;
static long readcnt, readpercg, fullcnt, inobufsize, partialcnt, partialsize;
static caddr_t inodebuf;
union dinode *
getnextinode(ino_t inumber)
{
long size;
ufs2_daddr_t dblk;
union dinode *dp;
static caddr_t nextinop;
if (inumber != nextino++ || inumber > lastvalidinum)
errx(EEXIT, "bad inode number %d to nextinode", inumber);
if (inumber >= lastinum) {
readcnt++;
dblk = fsbtodb(&sblock, ino_to_fsba(&sblock, lastinum));
if (readcnt % readpercg == 0) {
size = partialsize;
lastinum += partialcnt;
} else {
size = inobufsize;
lastinum += fullcnt;
}
/*
* If bread returns an error, it will already have zeroed
* out the buffer, so we do not need to do so here.
*/
(void)bread(fsreadfd, inodebuf, dblk, size);
nextinop = inodebuf;
}
dp = (union dinode *)nextinop;
if (sblock.fs_magic == FS_UFS1_MAGIC)
nextinop += sizeof(struct ufs1_dinode);
else
nextinop += sizeof(struct ufs2_dinode);
return (dp);
}
void
setinodebuf(ino_t inum)
{
if (inum % sblock.fs_ipg != 0)
errx(EEXIT, "bad inode number %d to setinodebuf", inum);
lastvalidinum = inum + sblock.fs_ipg - 1;
startinum = 0;
nextino = inum;
lastinum = inum;
readcnt = 0;
if (inodebuf != NULL)
return;
inobufsize = blkroundup(&sblock, INOBUFSIZE);
fullcnt = inobufsize / ((sblock.fs_magic == FS_UFS1_MAGIC) ?
sizeof(struct ufs1_dinode) : sizeof(struct ufs2_dinode));
readpercg = sblock.fs_ipg / fullcnt;
partialcnt = sblock.fs_ipg % fullcnt;
partialsize = partialcnt * ((sblock.fs_magic == FS_UFS1_MAGIC) ?
sizeof(struct ufs1_dinode) : sizeof(struct ufs2_dinode));
if (partialcnt != 0) {
readpercg++;
} else {
partialcnt = fullcnt;
partialsize = inobufsize;
}
if ((inodebuf = malloc((unsigned)inobufsize)) == NULL)
errx(EEXIT, "cannot allocate space for inode buffer");
}
void
freeinodebuf(void)
{
if (inodebuf != NULL)
free((char *)inodebuf);
inodebuf = NULL;
}
/*
* Routines to maintain information about directory inodes.
* This is built during the first pass and used during the
* second and third passes.
*
* Enter inodes into the cache.
*/
void
cacheino(union dinode *dp, ino_t inumber)
{
struct inoinfo *inp, **inpp;
int i, blks;
if (howmany(DIP(dp, di_size), sblock.fs_bsize) > NDADDR)
blks = NDADDR + NIADDR;
else
blks = howmany(DIP(dp, di_size), sblock.fs_bsize);
inp = (struct inoinfo *)
malloc(sizeof(*inp) + (blks - 1) * sizeof(ufs2_daddr_t));
if (inp == NULL)
errx(EEXIT, "cannot increase directory list");
inpp = &inphead[inumber % dirhash];
inp->i_nexthash = *inpp;
*inpp = inp;
inp->i_parent = inumber == ROOTINO ? ROOTINO : (ino_t)0;
inp->i_dotdot = (ino_t)0;
inp->i_number = inumber;
inp->i_isize = DIP(dp, di_size);
inp->i_numblks = blks;
for (i = 0; i < (blks < NDADDR ? blks : NDADDR); i++)
inp->i_blks[i] = DIP(dp, di_db[i]);
if (blks > NDADDR)
for (i = 0; i < NIADDR; i++)
inp->i_blks[NDADDR + i] = DIP(dp, di_ib[i]);
if (inplast == listmax) {
listmax += 100;
inpsort = (struct inoinfo **)realloc((char *)inpsort,
(unsigned)listmax * sizeof(struct inoinfo *));
if (inpsort == NULL)
errx(EEXIT, "cannot increase directory list");
}
inpsort[inplast++] = inp;
}
/*
* Look up an inode cache structure.
*/
struct inoinfo *
getinoinfo(ino_t inumber)
{
struct inoinfo *inp;
for (inp = inphead[inumber % dirhash]; inp; inp = inp->i_nexthash) {
if (inp->i_number != inumber)
continue;
return (inp);
}
errx(EEXIT, "cannot find inode %d", inumber);
return ((struct inoinfo *)0);
}
/*
* Clean up all the inode cache structure.
*/
void
inocleanup(void)
{
struct inoinfo **inpp;
if (inphead == NULL)
return;
for (inpp = &inpsort[inplast - 1]; inpp >= inpsort; inpp--)
free((char *)(*inpp));
free((char *)inphead);
free((char *)inpsort);
inphead = inpsort = NULL;
}
void
inodirty(void)
{
dirty(pbp);
}
void
clri(struct inodesc *idesc, const char *type, int flag)
{
union dinode *dp;
dp = ginode(idesc->id_number);
if (flag == 1) {
pwarn("%s %s", type,
(DIP(dp, di_mode) & IFMT) == IFDIR ? "DIR" : "FILE");
pinode(idesc->id_number);
}
if (preen || reply("CLEAR") == 1) {
if (preen)
printf(" (CLEARED)\n");
n_files--;
if (bkgrdflag == 0) {
(void)ckinode(dp, idesc);
inoinfo(idesc->id_number)->ino_state = USTATE;
clearinode(dp);
inodirty();
} else {
cmd.value = idesc->id_number;
cmd.size = -DIP(dp, di_nlink);
if (debug)
printf("adjrefcnt ino %ld amt %lld\n",
(long)cmd.value, (long long)cmd.size);
if (sysctl(adjrefcnt, MIBSIZE, 0, 0,
&cmd, sizeof cmd) == -1)
rwerror("ADJUST INODE", cmd.value);
}
}
}
int
findname(struct inodesc *idesc)
{
struct direct *dirp = idesc->id_dirp;
if (dirp->d_ino != idesc->id_parent || idesc->id_entryno < 2) {
idesc->id_entryno++;
return (KEEPON);
}
memmove(idesc->id_name, dirp->d_name, (size_t)dirp->d_namlen + 1);
return (STOP|FOUND);
}
int
findino(struct inodesc *idesc)
{
struct direct *dirp = idesc->id_dirp;
if (dirp->d_ino == 0)
return (KEEPON);
if (strcmp(dirp->d_name, idesc->id_name) == 0 &&
dirp->d_ino >= ROOTINO && dirp->d_ino <= maxino) {
idesc->id_parent = dirp->d_ino;
return (STOP|FOUND);
}
return (KEEPON);
}
int
clearentry(struct inodesc *idesc)
{
struct direct *dirp = idesc->id_dirp;
if (dirp->d_ino != idesc->id_parent || idesc->id_entryno < 2) {
idesc->id_entryno++;
return (KEEPON);
}
dirp->d_ino = 0;
return (STOP|FOUND|ALTERED);
}
void
pinode(ino_t ino)
{
union dinode *dp;
char *p;
struct passwd *pw;
time_t t;
printf(" I=%lu ", (u_long)ino);
if (ino < ROOTINO || ino > maxino)
return;
dp = ginode(ino);
printf(" OWNER=");
if ((pw = getpwuid((int)DIP(dp, di_uid))) != 0)
printf("%s ", pw->pw_name);
else
printf("%u ", (unsigned)DIP(dp, di_uid));
printf("MODE=%o\n", DIP(dp, di_mode));
if (preen)
printf("%s: ", cdevname);
printf("SIZE=%ju ", (uintmax_t)DIP(dp, di_size));
t = DIP(dp, di_mtime);
p = ctime(&t);
printf("MTIME=%12.12s %4.4s ", &p[4], &p[20]);
}
void
blkerror(ino_t ino, const char *type, ufs2_daddr_t blk)
{
pfatal("%jd %s I=%ju", (intmax_t)blk, type, (uintmax_t)ino);
printf("\n");
switch (inoinfo(ino)->ino_state) {
case FSTATE:
case FZLINK:
inoinfo(ino)->ino_state = FCLEAR;
return;
case DSTATE:
case DZLINK:
inoinfo(ino)->ino_state = DCLEAR;
return;
case FCLEAR:
case DCLEAR:
return;
default:
errx(EEXIT, "BAD STATE %d TO BLKERR", inoinfo(ino)->ino_state);
/* NOTREACHED */
}
}
/*
* allocate an unused inode
*/
ino_t
allocino(ino_t request, int type)
{
ino_t ino;
union dinode *dp;
struct cg *cgp = &cgrp;
int cg;
if (request == 0)
request = ROOTINO;
else if (inoinfo(request)->ino_state != USTATE)
return (0);
for (ino = request; ino < maxino; ino++)
if (inoinfo(ino)->ino_state == USTATE)
break;
if (ino == maxino)
return (0);
cg = ino_to_cg(&sblock, ino);
getblk(&cgblk, cgtod(&sblock, cg), sblock.fs_cgsize);
if (!cg_chkmagic(cgp))
pfatal("CG %d: BAD MAGIC NUMBER\n", cg);
setbit(cg_inosused(cgp), ino % sblock.fs_ipg);
cgp->cg_cs.cs_nifree--;
switch (type & IFMT) {
case IFDIR:
inoinfo(ino)->ino_state = DSTATE;
cgp->cg_cs.cs_ndir++;
break;
case IFREG:
case IFLNK:
inoinfo(ino)->ino_state = FSTATE;
break;
default:
return (0);
}
cgdirty();
dp = ginode(ino);
DIP_SET(dp, di_db[0], allocblk((long)1));
if (DIP(dp, di_db[0]) == 0) {
inoinfo(ino)->ino_state = USTATE;
return (0);
}
DIP_SET(dp, di_mode, type);
DIP_SET(dp, di_flags, 0);
DIP_SET(dp, di_atime, time(NULL));
DIP_SET(dp, di_ctime, DIP(dp, di_atime));
DIP_SET(dp, di_mtime, DIP(dp, di_ctime));
DIP_SET(dp, di_mtimensec, 0);
DIP_SET(dp, di_ctimensec, 0);
DIP_SET(dp, di_atimensec, 0);
DIP_SET(dp, di_size, sblock.fs_fsize);
DIP_SET(dp, di_blocks, btodb(sblock.fs_fsize));
n_files++;
inodirty();
inoinfo(ino)->ino_type = IFTODT(type);
return (ino);
}
/*
* deallocate an inode
*/
void
freeino(ino_t ino)
{
struct inodesc idesc;
union dinode *dp;
memset(&idesc, 0, sizeof(struct inodesc));
idesc.id_type = ADDR;
idesc.id_func = pass4check;
idesc.id_number = ino;
dp = ginode(ino);
(void)ckinode(dp, &idesc);
clearinode(dp);
inodirty();
inoinfo(ino)->ino_state = USTATE;
n_files--;
}
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