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NetBSD/sbin/fsck_lfs/dir.c

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/* $NetBSD: dir.c,v 1.7 2002/05/23 04:05:11 perseant 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <sys/mount.h> /* XXX */
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fsck.h"
#include "fsutil.h"
#include "extern.h"
char *lfname = "lost+found";
int lfmode = 01700;
struct dirtemplate emptydir = {0, DIRBLKSIZ};
struct dirtemplate dirhead = {
0, 12, DT_DIR, 1, ".",
0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
struct odirtemplate odirhead = {
0, 12, 1, ".",
0, DIRBLKSIZ - 12, 2, ".."
};
static int expanddir(struct dinode *, char *);
static void freedir(ino_t, ino_t);
static struct direct *fsck_readdir(struct inodesc *);
static struct bufarea *getdirblk(daddr_t, long);
static int lftempname(char *, ino_t);
static int mkentry(struct inodesc *);
static int chgino(struct inodesc *);
/*
* Propagate connected state through the tree.
*/
void
propagate()
{
register struct inoinfo **inpp, *inp, *pinp;
struct inoinfo **inpend;
/*
* Create a list of children for each directory.
*/
inpend = &inpsort[inplast];
for (inpp = inpsort; inpp < inpend; inpp++) {
inp = *inpp;
if (inp->i_parent == 0 ||
inp->i_number == ROOTINO)
continue;
pinp = getinoinfo(inp->i_parent);
inp->i_parentp = pinp;
inp->i_sibling = pinp->i_child;
pinp->i_child = inp;
}
inp = getinoinfo(ROOTINO);
while (inp) {
statemap[inp->i_number] = DFOUND;
if (inp->i_child &&
statemap[inp->i_child->i_number] == DSTATE)
inp = inp->i_child;
else if (inp->i_sibling)
inp = inp->i_sibling;
else
inp = inp->i_parentp;
}
}
/*
* Scan each entry in a directory block.
*/
int
dirscan(struct inodesc * idesc)
{
register struct direct *dp;
register struct bufarea *bp;
int dsize, n;
long blksiz;
char dbuf[DIRBLKSIZ];
if (idesc->id_type != DATA)
errexit("wrong type to dirscan %d\n", idesc->id_type);
if (idesc->id_entryno == 0 &&
(idesc->id_filesize & (DIRBLKSIZ - 1)) != 0)
idesc->id_filesize = roundup(idesc->id_filesize, DIRBLKSIZ);
blksiz = idesc->id_numfrags * sblock.lfs_fsize;
if (chkrange(idesc->id_blkno, fragstofsb(&sblock, idesc->id_numfrags))) {
idesc->id_filesize -= blksiz;
return (SKIP);
}
idesc->id_loc = 0;
for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
dsize = dp->d_reclen;
memcpy(dbuf, dp, (size_t)dsize);
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (!newinofmt) {
struct direct *tdp = (struct direct *)dbuf;
u_char tmp;
tmp = tdp->d_namlen;
tdp->d_namlen = tdp->d_type;
tdp->d_type = tmp;
}
# endif
idesc->id_dirp = (struct direct *)dbuf;
if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (!newinofmt && !doinglevel2) {
struct direct *tdp;
u_char tmp;
tdp = (struct direct *)dbuf;
tmp = tdp->d_namlen;
tdp->d_namlen = tdp->d_type;
tdp->d_type = tmp;
}
# endif
bp = getdirblk(idesc->id_blkno, blksiz);
memcpy(bp->b_un.b_buf + idesc->id_loc - dsize, dbuf,
(size_t)dsize);
dirty(bp);
sbdirty();
}
if (n & STOP)
return (n);
}
return (idesc->id_filesize > 0 ? KEEPON : STOP);
}
/*
* get next entry in a directory.
*/
static struct direct *
fsck_readdir(struct inodesc * idesc)
{
register struct direct *dp, *ndp;
register struct bufarea *bp;
long size, blksiz, fix, dploc;
blksiz = idesc->id_numfrags * sblock.lfs_fsize;
bp = getdirblk(idesc->id_blkno, blksiz);
if (idesc->id_loc % DIRBLKSIZ == 0 && idesc->id_filesize > 0 &&
idesc->id_loc < blksiz) {
dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
if (dircheck(idesc, dp))
goto dpok;
if (idesc->id_fix == IGNORE)
return (0);
fix = dofix(idesc, "DIRECTORY CORRUPTED");
bp = getdirblk(idesc->id_blkno, blksiz);
dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
dp->d_reclen = DIRBLKSIZ;
dp->d_ino = 0;
dp->d_type = 0;
dp->d_namlen = 0;
dp->d_name[0] = '\0';
if (fix)
dirty(bp);
idesc->id_loc += DIRBLKSIZ;
idesc->id_filesize -= DIRBLKSIZ;
return (dp);
}
dpok:
if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
return NULL;
dploc = idesc->id_loc;
dp = (struct direct *)(bp->b_un.b_buf + dploc);
idesc->id_loc += dp->d_reclen;
idesc->id_filesize -= dp->d_reclen;
if ((idesc->id_loc % DIRBLKSIZ) == 0)
return (dp);
ndp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
dircheck(idesc, ndp) == 0) {
size = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
idesc->id_loc += size;
idesc->id_filesize -= size;
if (idesc->id_fix == IGNORE)
return (0);
fix = dofix(idesc, "DIRECTORY CORRUPTED");
bp = getdirblk(idesc->id_blkno, blksiz);
dp = (struct direct *)(bp->b_un.b_buf + dploc);
dp->d_reclen += size;
if (fix)
dirty(bp);
}
return (dp);
}
/*
* Verify that a directory entry is valid.
* This is a superset of the checks made in the kernel.
*/
int
dircheck(struct inodesc * idesc, struct direct * dp)
{
register int size;
register char *cp;
u_char namlen, type;
int spaceleft;
spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
if (dp->d_ino >= maxino ||
dp->d_reclen == 0 ||
dp->d_reclen > spaceleft ||
(dp->d_reclen & 0x3) != 0) {
pwarn("ino too large, reclen=0, reclen>space, or reclen&3!=0\n");
pwarn("dp->d_ino = 0x%x\tdp->d_reclen = 0x%x\n",
dp->d_ino, dp->d_reclen);
pwarn("maxino = 0x%x\tspaceleft = 0x%x\n", maxino, spaceleft);
return (0);
}
if (dp->d_ino == 0)
return (1);
size = DIRSIZ(!newinofmt, dp, 0);
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (!newinofmt) {
type = dp->d_namlen;
namlen = dp->d_type;
} else {
namlen = dp->d_namlen;
type = dp->d_type;
}
# else
namlen = dp->d_namlen;
type = dp->d_type;
# endif
if (dp->d_reclen < size ||
idesc->id_filesize < size ||
/* namlen > MAXNAMLEN || */
type > 15) {
printf("reclen<size, filesize<size, namlen too large, or type>15\n");
return (0);
}
for (cp = dp->d_name, size = 0; size < namlen; size++)
if (*cp == '\0' || (*cp++ == '/')) {
printf("name contains NUL or /\n");
return (0);
}
if (*cp != '\0') {
printf("name size misstated\n");
return (0);
}
return (1);
}
void
direrror(ino_t ino, char *errmesg)
{
fileerror(ino, ino, errmesg);
}
void
fileerror(ino_t cwd, ino_t ino, char *errmesg)
{
register struct dinode *dp;
char pathbuf[MAXPATHLEN + 1];
pwarn("%s ", errmesg);
pinode(ino);
printf("\n");
getpathname(pathbuf, cwd, ino);
if (ino < ROOTINO || ino >= maxino) {
pfatal("NAME=%s\n", pathbuf);
return;
}
dp = ginode(ino);
if (dp == NULL)
pfatal("INO is NULL\n");
else {
if (ftypeok(dp))
pfatal("%s=%s\n",
(dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
else
pfatal("NAME=%s\n", pathbuf);
}
}
void
adjust(struct inodesc * idesc, short lcnt)
{
register struct dinode *dp;
dp = ginode(idesc->id_number);
if (dp->di_nlink == lcnt) {
if (linkup(idesc->id_number, (ino_t)0) == 0)
clri(idesc, "UNREF", 0);
} else {
pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
((dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE"));
pinode(idesc->id_number);
printf(" COUNT %d SHOULD BE %d",
dp->di_nlink, dp->di_nlink - lcnt);
if (preen) {
if (lcnt < 0) {
printf("\n");
pfatal("LINK COUNT INCREASING");
}
printf(" (ADJUSTED)\n");
}
if (preen || reply("ADJUST") == 1) {
dp->di_nlink -= lcnt;
inodirty();
}
}
}
static int
mkentry(struct inodesc * idesc)
{
register struct direct *dirp = idesc->id_dirp;
struct direct newent;
int newlen, oldlen;
newent.d_namlen = strlen(idesc->id_name);
newlen = DIRSIZ(0, &newent, 0);
if (dirp->d_ino != 0)
oldlen = DIRSIZ(0, dirp, 0);
else
oldlen = 0;
if (dirp->d_reclen - oldlen < newlen)
return (KEEPON);
newent.d_reclen = dirp->d_reclen - oldlen;
dirp->d_reclen = oldlen;
dirp = (struct direct *)(((char *)dirp) + oldlen);
dirp->d_ino = idesc->id_parent; /* ino to be entered is in id_parent */
dirp->d_reclen = newent.d_reclen;
if (newinofmt)
dirp->d_type = typemap[idesc->id_parent];
else
dirp->d_type = 0;
dirp->d_namlen = newent.d_namlen;
memcpy(dirp->d_name, idesc->id_name, (size_t)dirp->d_namlen + 1);
# if (BYTE_ORDER == LITTLE_ENDIAN)
/*
* If the entry was split, dirscan()will only reverse the byte
* order of the original entry, and not the new one, before
* writing it back out. So, we reverse the byte order here if
* necessary.
*/
if (oldlen != 0 && !newinofmt && !doinglevel2) {
u_char tmp;
tmp = dirp->d_namlen;
dirp->d_namlen = dirp->d_type;
dirp->d_type = tmp;
}
# endif
return (ALTERED | STOP);
}
static int
chgino(struct inodesc * idesc)
{
register struct direct *dirp = idesc->id_dirp;
if (memcmp(dirp->d_name, idesc->id_name, (int)dirp->d_namlen + 1))
return (KEEPON);
dirp->d_ino = idesc->id_parent;
if (newinofmt)
dirp->d_type = typemap[idesc->id_parent];
else
dirp->d_type = 0;
return (ALTERED | STOP);
}
int
linkup(ino_t orphan, ino_t parentdir)
{
register struct dinode *dp;
int lostdir;
ino_t oldlfdir;
struct inodesc idesc;
char tempname[BUFSIZ];
memset(&idesc, 0, sizeof(struct inodesc));
dp = ginode(orphan);
lostdir = (dp->di_mode & IFMT) == IFDIR;
pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
pinode(orphan);
if (preen && dp->di_size == 0)
return (0);
if (preen)
printf(" (RECONNECTED)\n");
else if (reply("RECONNECT") == 0)
return (0);
if (lfdir == 0) {
dp = ginode(ROOTINO);
idesc.id_name = lfname;
idesc.id_type = DATA;
idesc.id_func = findino;
idesc.id_number = ROOTINO;
if ((ckinode(dp, &idesc) & FOUND) != 0) {
lfdir = idesc.id_parent;
} else {
pwarn("NO lost+found DIRECTORY");
if (preen || reply("CREATE")) {
lfdir = allocdir(ROOTINO, (ino_t)0, lfmode);
if (lfdir != 0) {
if (makeentry(ROOTINO, lfdir, lfname) != 0) {
if (preen)
printf(" (CREATED)\n");
} else {
freedir(lfdir, ROOTINO);
lfdir = 0;
if (preen)
printf("\n");
}
}
}
}
if (lfdir == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
printf("\n\n");
return (0);
}
}
dp = ginode(lfdir);
if ((dp->di_mode & IFMT) != IFDIR) {
pfatal("lost+found IS NOT A DIRECTORY");
if (reply("REALLOCATE") == 0)
return (0);
oldlfdir = lfdir;
if ((lfdir = allocdir(ROOTINO, (ino_t)0, lfmode)) == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
return (0);
}
if ((changeino(ROOTINO, lfname, lfdir) & ALTERED) == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
return (0);
}
inodirty();
idesc.id_type = ADDR;
idesc.id_func = pass4check;
idesc.id_number = oldlfdir;
adjust(&idesc, lncntp[oldlfdir] + 1);
lncntp[oldlfdir] = 0;
dp = ginode(lfdir);
}
if (statemap[lfdir] != DFOUND) {
pfatal("SORRY. NO lost+found DIRECTORY\n\n");
return (0);
}
(void)lftempname(tempname, orphan);
if (makeentry(lfdir, orphan, tempname) == 0) {
pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
printf("\n\n");
return (0);
}
lncntp[orphan]--;
if (lostdir) {
if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
parentdir != (ino_t)-1)
(void)makeentry(orphan, lfdir, "..");
dp = ginode(lfdir);
dp->di_nlink++;
inodirty();
lncntp[lfdir]++;
pwarn("DIR I=%u CONNECTED. ", orphan);
if (parentdir != (ino_t)-1)
printf("PARENT WAS I=%u\n", parentdir);
if (preen == 0)
printf("\n");
}
return (1);
}
/*
* fix an entry in a directory.
*/
int
changeino(ino_t dir, char *name, ino_t newnum)
{
struct inodesc idesc;
memset(&idesc, 0, sizeof(struct inodesc));
idesc.id_type = DATA;
idesc.id_func = chgino;
idesc.id_number = dir;
idesc.id_fix = DONTKNOW;
idesc.id_name = name;
idesc.id_parent = newnum; /* new value for name */
return (ckinode(ginode(dir), &idesc));
}
/*
* make an entry in a directory
*/
int
makeentry(ino_t parent, ino_t ino, char *name)
{
struct dinode *dp;
struct inodesc idesc;
char pathbuf[MAXPATHLEN + 1];
if (parent < ROOTINO || parent >= maxino ||
ino < ROOTINO || ino >= maxino)
return (0);
memset(&idesc, 0, sizeof(struct inodesc));
idesc.id_type = DATA;
idesc.id_func = mkentry;
idesc.id_number = parent;
idesc.id_parent = ino; /* this is the inode to enter */
idesc.id_fix = DONTKNOW;
idesc.id_name = name;
dp = ginode(parent);
if (dp->di_size % DIRBLKSIZ) {
dp->di_size = roundup(dp->di_size, DIRBLKSIZ);
inodirty();
}
if ((ckinode(dp, &idesc) & ALTERED) != 0)
return (1);
getpathname(pathbuf, parent, parent);
dp = ginode(parent);
if (expanddir(dp, pathbuf) == 0)
return (0);
return (ckinode(dp, &idesc) & ALTERED);
}
/*
* Attempt to expand the size of a directory
*/
static int
expanddir(struct dinode * dp, char *name)
{
daddr_t lastbn, newblk;
register struct bufarea *bp;
char *cp, firstblk[DIRBLKSIZ];
lastbn = lblkno(&sblock, dp->di_size);
if (lastbn >= NDADDR - 1 || dp->di_db[lastbn] == 0 || dp->di_size == 0)
return (0);
if ((newblk = allocblk(sblock.lfs_frag)) == 0)
return (0);
dp->di_db[lastbn + 1] = dp->di_db[lastbn];
dp->di_db[lastbn] = newblk;
dp->di_size += sblock.lfs_bsize;
dp->di_blocks += btofsb(&sblock, sblock.lfs_bsize);
bp = getdirblk(dp->di_db[lastbn + 1],
(long)dblksize(&sblock, dp, lastbn + 1));
if (bp->b_errs)
goto bad;
memcpy(firstblk, bp->b_un.b_buf, DIRBLKSIZ);
bp = getdirblk(newblk, sblock.lfs_bsize);
if (bp->b_errs)
goto bad;
memcpy(bp->b_un.b_buf, firstblk, DIRBLKSIZ);
for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
cp < &bp->b_un.b_buf[sblock.lfs_bsize];
cp += DIRBLKSIZ)
memcpy(cp, &emptydir, sizeof emptydir);
dirty(bp);
bp = getdirblk(dp->di_db[lastbn + 1],
(long)dblksize(&sblock, dp, lastbn + 1));
if (bp->b_errs)
goto bad;
memcpy(bp->b_un.b_buf, &emptydir, sizeof emptydir);
pwarn("NO SPACE LEFT IN %s", name);
if (preen)
printf(" (EXPANDED)\n");
else if (reply("EXPAND") == 0)
goto bad;
dirty(bp);
inodirty();
return (1);
bad:
dp->di_db[lastbn] = dp->di_db[lastbn + 1];
dp->di_db[lastbn + 1] = 0;
dp->di_size -= sblock.lfs_bsize;
dp->di_blocks -= btofsb(&sblock, sblock.lfs_bsize);
freeblk(newblk, sblock.lfs_frag);
return (0);
}
/*
* allocate a new directory
*/
int
allocdir(ino_t parent, ino_t request, int mode)
{
ino_t ino;
char *cp;
struct dinode *dp;
register struct bufarea *bp;
struct dirtemplate *dirp;
ino = allocino(request, IFDIR | mode);
if (newinofmt)
dirp = &dirhead;
else
dirp = (struct dirtemplate *) & odirhead;
dirp->dot_ino = ino;
dirp->dotdot_ino = parent;
dp = ginode(ino);
bp = getdirblk(dp->di_db[0], sblock.lfs_fsize);
if (bp->b_errs) {
freeino(ino);
return (0);
}
memcpy(bp->b_un.b_buf, dirp, sizeof(struct dirtemplate));
for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
cp < &bp->b_un.b_buf[sblock.lfs_fsize];
cp += DIRBLKSIZ)
memcpy(cp, &emptydir, sizeof emptydir);
dirty(bp);
dp->di_nlink = 2;
inodirty();
if (ino == ROOTINO) {
lncntp[ino] = dp->di_nlink;
cacheino(dp, ino);
return (ino);
}
if (statemap[parent] != DSTATE && statemap[parent] != DFOUND) {
freeino(ino);
return (0);
}
cacheino(dp, ino);
statemap[ino] = statemap[parent];
if (statemap[ino] == DSTATE) {
lncntp[ino] = dp->di_nlink;
lncntp[parent]++;
}
dp = ginode(parent);
dp->di_nlink++;
inodirty();
return (ino);
}
/*
* free a directory inode
*/
static void
freedir(ino_t ino, ino_t parent)
{
struct dinode *dp;
if (ino != parent) {
dp = ginode(parent);
dp->di_nlink--;
inodirty();
}
freeino(ino);
}
/*
* generate a temporary name for the lost+found directory.
*/
static int
lftempname(char *bufp, ino_t ino)
{
register ino_t in;
register char *cp;
int namlen;
cp = bufp + 2;
for (in = maxino; in > 0; in /= 10)
cp++;
*--cp = 0;
namlen = cp - bufp;
in = ino;
while (cp > bufp) {
*--cp = (in % 10) + '0';
in /= 10;
}
*cp = '#';
return (namlen);
}
/*
* Get a directory block.
* Ensure that it is held until another is requested.
*/
static struct bufarea *
getdirblk(daddr_t blkno, long size)
{
if (pdirbp != 0)
pdirbp->b_flags &= ~B_INUSE;
/* pdirbp = getdatablk(blkno, size); */
pdirbp = getddblk(blkno, size);
return (pdirbp);
}
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