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NetBSD/sbin/fsck_lfs/dir.c

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/* $NetBSD: dir.c,v 1.32 2013/06/18 18:18:58 christos 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/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_inode.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bufcache.h"
#include "vnode.h"
#include "lfs_user.h"
#include "fsck.h"
#include "fsutil.h"
#include "extern.h"
const char *lfname = "lost+found";
int lfmode = 01700;
struct lfs_dirtemplate emptydir = {
.dot_ino = 0,
.dot_reclen = LFS_DIRBLKSIZ,
};
struct lfs_dirtemplate dirhead = {
.dot_ino = 0,
.dot_reclen = 12,
.dot_type = LFS_DT_DIR,
.dot_namlen = 1,
.dot_name = ".",
.dotdot_ino = 0,
.dotdot_reclen = LFS_DIRBLKSIZ - 12,
.dotdot_type = LFS_DT_DIR,
.dotdot_namlen = 2,
.dotdot_name = ".."
};
struct lfs_odirtemplate odirhead = {
.dot_ino = 0,
.dot_reclen = 12,
.dot_namlen = 1,
.dot_name = ".",
.dotdot_ino = 0,
.dotdot_reclen = LFS_DIRBLKSIZ - 12,
.dotdot_namlen = 2,
.dotdot_name = ".."
};
static int expanddir(struct uvnode *, struct ulfs1_dinode *, char *);
static void freedir(ino_t, ino_t);
static struct lfs_direct *fsck_readdir(struct uvnode *, struct inodesc *);
static int lftempname(char *, ino_t);
static int mkentry(struct inodesc *);
static int chgino(struct inodesc *);
/*
* Propagate connected state through the tree.
*/
void
propagate(void)
{
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 == ULFS_ROOTINO)
continue;
pinp = getinoinfo(inp->i_parent);
inp->i_parentp = pinp;
inp->i_sibling = pinp->i_child;
pinp->i_child = inp;
}
inp = getinoinfo(ULFS_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)
{
struct lfs_direct *dp;
struct ubuf *bp;
int dsize, n;
long blksiz;
char dbuf[LFS_DIRBLKSIZ];
struct uvnode *vp;
if (idesc->id_type != DATA)
errexit("wrong type to dirscan %d", idesc->id_type);
if (idesc->id_entryno == 0 &&
(idesc->id_filesize & (LFS_DIRBLKSIZ - 1)) != 0)
idesc->id_filesize = roundup(idesc->id_filesize, LFS_DIRBLKSIZ);
blksiz = idesc->id_numfrags * fs->lfs_fsize;
if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
idesc->id_filesize -= blksiz;
return (SKIP);
}
idesc->id_loc = 0;
vp = vget(fs, idesc->id_number);
for (dp = fsck_readdir(vp, idesc); dp != NULL;
dp = fsck_readdir(vp, idesc)) {
dsize = dp->d_reclen;
memcpy(dbuf, dp, (size_t) dsize);
idesc->id_dirp = (struct lfs_direct *) dbuf;
if ((n = (*idesc->id_func) (idesc)) & ALTERED) {
bread(vp, idesc->id_lblkno, blksiz, NOCRED, 0, &bp);
memcpy(bp->b_data + idesc->id_loc - dsize, dbuf,
(size_t) dsize);
VOP_BWRITE(bp);
sbdirty();
}
if (n & STOP)
return (n);
}
return (idesc->id_filesize > 0 ? KEEPON : STOP);
}
/*
* get next entry in a directory.
*/
static struct lfs_direct *
fsck_readdir(struct uvnode *vp, struct inodesc *idesc)
{
struct lfs_direct *dp, *ndp;
struct ubuf *bp;
long size, blksiz, fix, dploc;
blksiz = idesc->id_numfrags * fs->lfs_fsize;
bread(vp, idesc->id_lblkno, blksiz, NOCRED, 0, &bp);
if (idesc->id_loc % LFS_DIRBLKSIZ == 0 && idesc->id_filesize > 0 &&
idesc->id_loc < blksiz) {
dp = (struct lfs_direct *) (bp->b_data + idesc->id_loc);
if (dircheck(idesc, dp))
goto dpok;
brelse(bp, 0);
if (idesc->id_fix == IGNORE)
return (0);
fix = dofix(idesc, "DIRECTORY CORRUPTED");
bread(vp, idesc->id_lblkno, blksiz, NOCRED, 0, &bp);
dp = (struct lfs_direct *) (bp->b_data + idesc->id_loc);
dp->d_reclen = LFS_DIRBLKSIZ;
dp->d_ino = 0;
dp->d_type = 0;
dp->d_namlen = 0;
dp->d_name[0] = '\0';
if (fix)
VOP_BWRITE(bp);
else
brelse(bp, 0);
idesc->id_loc += LFS_DIRBLKSIZ;
idesc->id_filesize -= LFS_DIRBLKSIZ;
return (dp);
}
dpok:
if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz) {
brelse(bp, 0);
return NULL;
}
dploc = idesc->id_loc;
dp = (struct lfs_direct *) (bp->b_data + dploc);
idesc->id_loc += dp->d_reclen;
idesc->id_filesize -= dp->d_reclen;
if ((idesc->id_loc % LFS_DIRBLKSIZ) == 0) {
brelse(bp, 0);
return dp;
}
ndp = (struct lfs_direct *) (bp->b_data + idesc->id_loc);
if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
dircheck(idesc, ndp) == 0) {
brelse(bp, 0);
size = LFS_DIRBLKSIZ - (idesc->id_loc % LFS_DIRBLKSIZ);
idesc->id_loc += size;
idesc->id_filesize -= size;
if (idesc->id_fix == IGNORE)
return 0;
fix = dofix(idesc, "DIRECTORY CORRUPTED");
bread(vp, idesc->id_lblkno, blksiz, NOCRED, 0, &bp);
dp = (struct lfs_direct *) (bp->b_data + dploc);
dp->d_reclen += size;
if (fix)
VOP_BWRITE(bp);
else
brelse(bp, 0);
} else
brelse(bp, 0);
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 lfs_direct *dp)
{
int size;
char *cp;
u_char namlen, type;
int spaceleft;
spaceleft = LFS_DIRBLKSIZ - (idesc->id_loc % LFS_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 = %llu\tspaceleft = 0x%x\n",
(unsigned long long)maxino, spaceleft);
return (0);
}
if (dp->d_ino == 0)
return (1);
size = LFS_DIRSIZ(0, dp, 0);
namlen = dp->d_namlen;
type = dp->d_type;
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, const char *errmesg)
{
fileerror(ino, ino, errmesg);
}
void
fileerror(ino_t cwd, ino_t ino, const char *errmesg)
{
char pathbuf[MAXPATHLEN + 1];
struct uvnode *vp;
pwarn("%s ", errmesg);
pinode(ino);
printf("\n");
pwarn("PARENT=%lld\n", (long long)cwd);
getpathname(pathbuf, sizeof(pathbuf), cwd, ino);
if (ino < ULFS_ROOTINO || ino >= maxino) {
pfatal("NAME=%s\n", pathbuf);
return;
}
vp = vget(fs, ino);
if (vp == NULL)
pfatal("INO is NULL\n");
else {
if (ftypeok(VTOD(vp)))
pfatal("%s=%s\n",
(VTOI(vp)->i_ffs1_mode & LFS_IFMT) == LFS_IFDIR ?
"DIR" : "FILE", pathbuf);
else
pfatal("NAME=%s\n", pathbuf);
}
}
void
adjust(struct inodesc *idesc, short lcnt)
{
struct uvnode *vp;
struct ulfs1_dinode *dp;
vp = vget(fs, idesc->id_number);
dp = VTOD(vp);
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 & LFS_IFMT) == LFS_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(VTOI(vp));
}
}
}
static int
mkentry(struct inodesc *idesc)
{
struct lfs_direct *dirp = idesc->id_dirp;
struct lfs_direct newent;
int newlen, oldlen;
newent.d_namlen = strlen(idesc->id_name);
newlen = LFS_DIRSIZ(0, &newent, 0);
if (dirp->d_ino != 0)
oldlen = LFS_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 lfs_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_type = typemap[idesc->id_parent];
dirp->d_namlen = newent.d_namlen;
memcpy(dirp->d_name, idesc->id_name, (size_t) dirp->d_namlen + 1);
return (ALTERED | STOP);
}
static int
chgino(struct inodesc *idesc)
{
struct lfs_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;
dirp->d_type = typemap[idesc->id_parent];
return (ALTERED | STOP);
}
int
linkup(ino_t orphan, ino_t parentdir)
{
struct ulfs1_dinode *dp;
int lostdir;
ino_t oldlfdir;
struct inodesc idesc;
char tempname[BUFSIZ];
struct uvnode *vp;
memset(&idesc, 0, sizeof(struct inodesc));
vp = vget(fs, orphan);
dp = VTOD(vp);
lostdir = (dp->di_mode & LFS_IFMT) == LFS_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(ULFS_ROOTINO);
idesc.id_name = lfname;
idesc.id_type = DATA;
idesc.id_func = findino;
idesc.id_number = ULFS_ROOTINO;
if ((ckinode(dp, &idesc) & FOUND) != 0) {
lfdir = idesc.id_parent;
} else {
pwarn("NO lost+found DIRECTORY");
if (preen || reply("CREATE")) {
lfdir = allocdir(ULFS_ROOTINO, (ino_t) 0, lfmode);
if (lfdir != 0) {
if (makeentry(ULFS_ROOTINO, lfdir, lfname) != 0) {
if (preen)
printf(" (CREATED)\n");
} else {
freedir(lfdir, ULFS_ROOTINO);
lfdir = 0;
if (preen)
printf("\n");
}
}
}
}
if (lfdir == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
printf("\n\n");
return (0);
}
}
vp = vget(fs, lfdir);
dp = VTOD(vp);
if ((dp->di_mode & LFS_IFMT) != LFS_IFDIR) {
pfatal("lost+found IS NOT A DIRECTORY");
if (reply("REALLOCATE") == 0)
return (0);
oldlfdir = lfdir;
if ((lfdir = allocdir(ULFS_ROOTINO, (ino_t) 0, lfmode)) == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
return (0);
}
if ((changeino(ULFS_ROOTINO, lfname, lfdir) & ALTERED) == 0) {
pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
return (0);
}
inodirty(VTOI(vp));
idesc.id_type = ADDR;
idesc.id_func = pass4check;
idesc.id_number = oldlfdir;
adjust(&idesc, lncntp[oldlfdir] + 1);
lncntp[oldlfdir] = 0;
vp = vget(fs, lfdir);
dp = VTOD(vp);
}
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, "..");
vp = vget(fs, lfdir);
VTOI(vp)->i_ffs1_nlink++;
inodirty(VTOI(vp));
lncntp[lfdir]++;
pwarn("DIR I=%llu CONNECTED. ", (unsigned long long)orphan);
if (parentdir != (ino_t) - 1)
printf("PARENT WAS I=%llu\n",
(unsigned long long)parentdir);
if (preen == 0)
printf("\n");
}
return (1);
}
/*
* fix an entry in a directory.
*/
int
changeino(ino_t dir, const 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, const char *name)
{
struct ulfs1_dinode *dp;
struct inodesc idesc;
char pathbuf[MAXPATHLEN + 1];
struct uvnode *vp;
if (parent < ULFS_ROOTINO || parent >= maxino ||
ino < ULFS_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;
vp = vget(fs, parent);
dp = VTOD(vp);
if (dp->di_size % LFS_DIRBLKSIZ) {
dp->di_size = roundup(dp->di_size, LFS_DIRBLKSIZ);
inodirty(VTOI(vp));
}
if ((ckinode(dp, &idesc) & ALTERED) != 0)
return (1);
getpathname(pathbuf, sizeof(pathbuf), parent, parent);
vp = vget(fs, parent);
dp = VTOD(vp);
if (expanddir(vp, dp, pathbuf) == 0)
return (0);
return (ckinode(dp, &idesc) & ALTERED);
}
/*
* Attempt to expand the size of a directory
*/
static int
expanddir(struct uvnode *vp, struct ulfs1_dinode *dp, char *name)
{
daddr_t lastbn;
struct ubuf *bp;
char *cp, firstblk[LFS_DIRBLKSIZ];
lastbn = lfs_lblkno(fs, dp->di_size);
if (lastbn >= ULFS_NDADDR - 1 || dp->di_db[lastbn] == 0 || dp->di_size == 0)
return (0);
dp->di_db[lastbn + 1] = dp->di_db[lastbn];
dp->di_db[lastbn] = 0;
bp = getblk(vp, lastbn, fs->lfs_bsize);
VOP_BWRITE(bp);
dp->di_size += fs->lfs_bsize;
dp->di_blocks += lfs_btofsb(fs, fs->lfs_bsize);
bread(vp, dp->di_db[lastbn + 1],
(long) lfs_dblksize(fs, dp, lastbn + 1), NOCRED, 0, &bp);
if (bp->b_flags & B_ERROR)
goto bad;
memcpy(firstblk, bp->b_data, LFS_DIRBLKSIZ);
bread(vp, lastbn, fs->lfs_bsize, NOCRED, 0, &bp);
if (bp->b_flags & B_ERROR)
goto bad;
memcpy(bp->b_data, firstblk, LFS_DIRBLKSIZ);
for (cp = &bp->b_data[LFS_DIRBLKSIZ];
cp < &bp->b_data[fs->lfs_bsize];
cp += LFS_DIRBLKSIZ)
memcpy(cp, &emptydir, sizeof emptydir);
VOP_BWRITE(bp);
bread(vp, dp->di_db[lastbn + 1],
(long) lfs_dblksize(fs, dp, lastbn + 1), NOCRED, 0, &bp);
if (bp->b_flags & B_ERROR)
goto bad;
memcpy(bp->b_data, &emptydir, sizeof emptydir);
pwarn("NO SPACE LEFT IN %s", name);
if (preen)
printf(" (EXPANDED)\n");
else if (reply("EXPAND") == 0)
goto bad;
VOP_BWRITE(bp);
inodirty(VTOI(vp));
return (1);
bad:
dp->di_db[lastbn] = dp->di_db[lastbn + 1];
dp->di_db[lastbn + 1] = 0;
dp->di_size -= fs->lfs_bsize;
dp->di_blocks -= lfs_btofsb(fs, fs->lfs_bsize);
return (0);
}
/*
* allocate a new directory
*/
int
allocdir(ino_t parent, ino_t request, int mode)
{
ino_t ino;
char *cp;
struct ulfs1_dinode *dp;
struct ubuf *bp;
struct lfs_dirtemplate *dirp;
struct uvnode *vp;
ino = allocino(request, LFS_IFDIR | mode);
dirp = &dirhead;
dirp->dot_ino = ino;
dirp->dotdot_ino = parent;
vp = vget(fs, ino);
dp = VTOD(vp);
bread(vp, dp->di_db[0], fs->lfs_fsize, NOCRED, 0, &bp);
if (bp->b_flags & B_ERROR) {
brelse(bp, 0);
freeino(ino);
return (0);
}
memcpy(bp->b_data, dirp, sizeof(struct lfs_dirtemplate));
for (cp = &bp->b_data[LFS_DIRBLKSIZ];
cp < &bp->b_data[fs->lfs_fsize];
cp += LFS_DIRBLKSIZ)
memcpy(cp, &emptydir, sizeof emptydir);
VOP_BWRITE(bp);
dp->di_nlink = 2;
inodirty(VTOI(vp));
if (ino == ULFS_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]++;
}
vp = vget(fs, parent);
dp = VTOD(vp);
dp->di_nlink++;
inodirty(VTOI(vp));
return (ino);
}
/*
* free a directory inode
*/
static void
freedir(ino_t ino, ino_t parent)
{
struct uvnode *vp;
if (ino != parent) {
vp = vget(fs, parent);
VTOI(vp)->i_ffs1_nlink--;
inodirty(VTOI(vp));
}
freeino(ino);
}
/*
* generate a temporary name for the lost+found directory.
*/
static int
lftempname(char *bufp, ino_t ino)
{
ino_t in;
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);
}
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