NetBSD/sbin/fsck/dir.c

627 lines
15 KiB
C

/*
* Copyright (c) 1980, 1986 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.
*/
#ifndef lint
static char sccsid[] = "@(#)dir.c 5.19 (Berkeley) 7/26/91";
static char rcsid[] = "$Header: /cvsroot/src/sbin/fsck/Attic/dir.c,v 1.3 1993/03/23 00:27:46 cgd Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <ufs/dinode.h>
#include <ufs/fs.h>
#define KERNEL
#include <ufs/dir.h>
#undef KERNEL
#include <stdlib.h>
#include <string.h>
#include "fsck.h"
char *lfname = "lost+found";
int lfmode = 01777;
struct dirtemplate emptydir = { 0, DIRBLKSIZ };
struct dirtemplate dirhead = { 0, 12, 1, ".", 0, DIRBLKSIZ - 12, 2, ".." };
struct direct *fsck_readdir();
struct bufarea *getdirblk();
/*
* Propagate connected state through the tree.
*/
propagate()
{
register struct inoinfo **inpp, *inp;
struct inoinfo **inpend;
long change;
inpend = &inpsort[inplast];
do {
change = 0;
for (inpp = inpsort; inpp < inpend; inpp++) {
inp = *inpp;
if (inp->i_parent == 0)
continue;
if (statemap[inp->i_parent] == DFOUND &&
statemap[inp->i_number] == DSTATE) {
statemap[inp->i_number] = DFOUND;
change++;
}
}
} while (change > 0);
}
/*
* Scan each entry in a directory block.
*/
dirscan(idesc)
register 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.fs_fsize;
if (chkrange(idesc->id_blkno, 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;
bcopy((char *)dp, dbuf, (size_t)dsize);
idesc->id_dirp = (struct direct *)dbuf;
if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
bp = getdirblk(idesc->id_blkno, blksiz);
bcopy(dbuf, bp->b_un.b_buf + idesc->id_loc - dsize,
(size_t)dsize);
dirty(bp);
sbdirty();
}
if (n & STOP)
return (n);
}
return (idesc->id_filesize > 0 ? KEEPON : STOP);
}
/*
* get next entry in a directory.
*/
struct direct *
fsck_readdir(idesc)
register struct inodesc *idesc;
{
register struct direct *dp, *ndp;
register struct bufarea *bp;
long size, blksiz, fix;
blksiz = idesc->id_numfrags * sblock.fs_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;
idesc->id_loc += DIRBLKSIZ;
idesc->id_filesize -= DIRBLKSIZ;
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_namlen = 0;
dp->d_name[0] = '\0';
if (fix)
dirty(bp);
return (dp);
}
dpok:
if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
return NULL;
dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
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;
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 += 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.
*/
dircheck(idesc, dp)
struct inodesc *idesc;
register struct direct *dp;
{
register int size;
register char *cp;
int spaceleft;
size = DIRSIZ(dp);
spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
if (dp->d_ino < maxino &&
dp->d_reclen != 0 &&
dp->d_reclen <= spaceleft &&
(dp->d_reclen & 0x3) == 0 &&
dp->d_reclen >= size &&
idesc->id_filesize >= size &&
dp->d_namlen <= MAXNAMLEN) {
if (dp->d_ino == 0)
return (1);
for (cp = dp->d_name, size = 0; size < dp->d_namlen; size++)
if (*cp == 0 || (*cp++ == '/'))
return (0);
if (*cp == 0)
return (1);
}
return (0);
}
direrror(ino, errmesg)
ino_t ino;
char *errmesg;
{
fileerror(ino, ino, errmesg);
}
fileerror(cwd, ino, errmesg)
ino_t cwd, 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 (ftypeok(dp))
pfatal("%s=%s\n",
(dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
else
pfatal("NAME=%s\n", pathbuf);
}
adjust(idesc, lcnt)
register 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();
}
}
}
mkentry(idesc)
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(&newent);
if (dirp->d_ino != 0)
oldlen = DIRSIZ(dirp);
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;
dirp->d_namlen = newent.d_namlen;
bcopy(idesc->id_name, dirp->d_name, (size_t)dirp->d_namlen + 1);
return (ALTERED|STOP);
}
chgino(idesc)
struct inodesc *idesc;
{
register struct direct *dirp = idesc->id_dirp;
if (bcmp(dirp->d_name, idesc->id_name, (int)dirp->d_namlen + 1))
return (KEEPON);
dirp->d_ino = idesc->id_parent;
return (ALTERED|STOP);
}
linkup(orphan, parentdir)
ino_t orphan;
ino_t parentdir;
{
register struct dinode *dp;
int lostdir;
ino_t oldlfdir;
struct inodesc idesc;
char tempname[BUFSIZ];
extern int pass4check();
bzero((char *)&idesc, 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=%lu CONNECTED. ", orphan);
if (parentdir != (ino_t)-1)
printf("PARENT WAS I=%lu\n", parentdir);
if (preen == 0)
printf("\n");
}
return (1);
}
/*
* fix an entry in a directory.
*/
changeino(dir, name, newnum)
ino_t dir;
char *name;
ino_t newnum;
{
struct inodesc idesc;
bzero((char *)&idesc, 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
*/
makeentry(parent, ino, name)
ino_t parent, ino;
char *name;
{
struct dinode *dp;
struct inodesc idesc;
char pathbuf[MAXPATHLEN + 1];
if (parent < ROOTINO || parent >= maxino ||
ino < ROOTINO || ino >= maxino)
return (0);
bzero((char *)&idesc, 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
*/
expanddir(dp, name)
register 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.fs_frag)) == 0)
return (0);
dp->di_db[lastbn + 1] = dp->di_db[lastbn];
dp->di_db[lastbn] = newblk;
dp->di_size += sblock.fs_bsize;
dp->di_blocks += btodb(sblock.fs_bsize);
bp = getdirblk(dp->di_db[lastbn + 1],
(long)dblksize(&sblock, dp, lastbn + 1));
if (bp->b_errs)
goto bad;
bcopy(bp->b_un.b_buf, firstblk, DIRBLKSIZ);
bp = getdirblk(newblk, sblock.fs_bsize);
if (bp->b_errs)
goto bad;
bcopy(firstblk, bp->b_un.b_buf, DIRBLKSIZ);
for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
cp < &bp->b_un.b_buf[sblock.fs_bsize];
cp += DIRBLKSIZ)
bcopy((char *)&emptydir, cp, sizeof emptydir);
dirty(bp);
bp = getdirblk(dp->di_db[lastbn + 1],
(long)dblksize(&sblock, dp, lastbn + 1));
if (bp->b_errs)
goto bad;
bcopy((char *)&emptydir, bp->b_un.b_buf, 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.fs_bsize;
dp->di_blocks -= btodb(sblock.fs_bsize);
freeblk(newblk, sblock.fs_frag);
return (0);
}
/*
* allocate a new directory
*/
allocdir(parent, request, mode)
ino_t parent, request;
int mode;
{
ino_t ino;
char *cp;
struct dinode *dp;
register struct bufarea *bp;
ino = allocino(request, IFDIR|mode);
dirhead.dot_ino = ino;
dirhead.dotdot_ino = parent;
dp = ginode(ino);
bp = getdirblk(dp->di_db[0], sblock.fs_fsize);
if (bp->b_errs) {
freeino(ino);
return (0);
}
bcopy((char *)&dirhead, bp->b_un.b_buf, sizeof dirhead);
for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
cp < &bp->b_un.b_buf[sblock.fs_fsize];
cp += DIRBLKSIZ)
bcopy((char *)&emptydir, cp, 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
*/
freedir(ino, parent)
ino_t ino, 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.
*/
lftempname(bufp, ino)
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.
* Insure that it is held until another is requested.
*/
struct bufarea *
getdirblk(blkno, size)
daddr_t blkno;
long size;
{
if (pdirbp != 0)
pdirbp->b_flags &= ~B_INUSE;
pdirbp = getdatablk(blkno, size);
return (pdirbp);
}