/*      $OpenBSD: dir.c,v 1.20 2015/01/16 06:39:57 deraadt Exp $        */
/*      $NetBSD: dir.c,v 1.5 2000/01/28 16:01:46 bouyer Exp $   */

/*
 * Copyright (c) 1997 Manuel Bouyer.
 * 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/param.h>  /* DEV_BSIZE roundup */
#include <sys/time.h>
#include <ufs/ufs/dir.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ext2fs/ext2fs.h>

#include <ufs/ufs/dinode.h> /* for IFMT & friends */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include "fsck.h"
#include "fsutil.h"
#include "extern.h"

char    *lfname = "lost+found";
int     lfmode = 01777;
struct  ext2fs_dirtemplate emptydir = { 0, DIRBLKSIZ };
struct  ext2fs_dirtemplate dirhead = {
        0, 12, 1, EXT2_FT_DIR, ".",
        0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
};
#undef DIRBLKSIZ

static int expanddir(struct ext2fs_dinode *, char *);
static void freedir(ino_t, ino_t);
static struct ext2fs_direct *fsck_readdir(struct inodesc *);
static struct bufarea *getdirblk(daddr32_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(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 == EXT2_ROOTINO)
                        continue;
                pinp = getinoinfo(inp->i_parent);
                inp->i_parentp = pinp;
                inp->i_sibling = pinp->i_child;
                pinp->i_child = inp;
        }
        inp = getinoinfo(EXT2_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 ext2fs_direct *dp;
        struct bufarea *bp;
        int dsize, n;
        long blksiz;
        char *dbuf = NULL;

        if ((dbuf = malloc(sblock.e2fs_bsize)) == NULL) {
                fprintf(stderr, "out of memory");
                exit(8);
        }

        if (idesc->id_type != DATA)
                errexit("wrong type to dirscan %d\n", idesc->id_type);
        if (idesc->id_entryno == 0 &&
            (idesc->id_filesize & (sblock.e2fs_bsize - 1)) != 0)
                idesc->id_filesize = roundup(idesc->id_filesize, sblock.e2fs_bsize);
        blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
        if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
                idesc->id_filesize -= blksiz;
                free(dbuf);
                return (SKIP);
        }
        idesc->id_loc = 0;
        for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
                dsize = letoh16(dp->e2d_reclen);
                memcpy(dbuf, dp, (size_t)dsize);
                idesc->id_dirp = (struct ext2fs_direct *)dbuf;
                if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
                        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) {
                        free(dbuf);
                        return (n);
                }
        }
        free(dbuf);
        return (idesc->id_filesize > 0 ? KEEPON : STOP);
}

/*
 * get next entry in a directory.
 */
static struct ext2fs_direct *
fsck_readdir(struct inodesc *idesc)
{
        struct ext2fs_direct *dp, *ndp;
        struct bufarea *bp;
        long size, blksiz, fix, dploc;

        blksiz = idesc->id_numfrags * sblock.e2fs_bsize;
        bp = getdirblk(idesc->id_blkno, blksiz);
        if (idesc->id_loc % sblock.e2fs_bsize == 0 && idesc->id_filesize > 0 &&
            idesc->id_loc < blksiz) {
                dp = (struct ext2fs_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 ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
                dp->e2d_reclen = htole16(sblock.e2fs_bsize);
                dp->e2d_ino = 0;
                dp->e2d_namlen = 0;
                dp->e2d_type = 0;
                dp->e2d_name[0] = '\0';
                if (fix)
                        dirty(bp);
                idesc->id_loc += sblock.e2fs_bsize;
                idesc->id_filesize -= sblock.e2fs_bsize;
                return (dp);
        }
dpok:
        if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
                return NULL;
        dploc = idesc->id_loc;
        dp = (struct ext2fs_direct *)(bp->b_un.b_buf + dploc);
        idesc->id_loc += letoh16(dp->e2d_reclen);
        idesc->id_filesize -= letoh16(dp->e2d_reclen);
        if ((idesc->id_loc % sblock.e2fs_bsize) == 0)
                return (dp);
        ndp = (struct ext2fs_direct *)(bp->b_un.b_buf + idesc->id_loc);
        if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
            dircheck(idesc, ndp) == 0) {
                size = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
                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 ext2fs_direct *)(bp->b_un.b_buf + dploc);
                dp->e2d_reclen = htole16(letoh16(dp->e2d_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 ext2fs_direct *dp)
{
        int size;
        char *cp;
        int spaceleft;
        u_int16_t reclen = letoh16(dp->e2d_reclen);

        spaceleft = sblock.e2fs_bsize - (idesc->id_loc % sblock.e2fs_bsize);
        if (letoh32(dp->e2d_ino) > maxino ||
            reclen == 0 ||
            reclen > spaceleft ||
            (reclen & 0x3) != 0)
                return (0);
        if (dp->e2d_ino == 0)
                return (1);
        if (sblock.e2fs.e2fs_rev < E2FS_REV1 ||
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE) == 0)
                if (dp->e2d_type != 0)
                        return (1);
        size = EXT2FS_DIRSIZ(dp->e2d_namlen);
        if (reclen < size ||
            idesc->id_filesize < size ||
            dp->e2d_namlen > EXT2FS_MAXNAMLEN)
                return (0);
        for (cp = dp->e2d_name, size = 0; size < dp->e2d_namlen; size++)
                if (*cp == '\0' || (*cp++ == '/'))
                        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)
{
        struct ext2fs_dinode *dp;
        char pathbuf[PATH_MAX + 1];

        pwarn("%s ", errmesg);
        pinode(ino);
        printf("\n");
        getpathname(pathbuf, sizeof pathbuf, cwd, ino);
        if ((ino < EXT2_FIRSTINO && ino != EXT2_ROOTINO) || ino > maxino) {
                pfatal("NAME=%s\n", pathbuf);
                return;
        }
        dp = ginode(ino);
        if (ftypeok(dp))
                pfatal("%s=%s\n",
                    (letoh16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
        else
                pfatal("NAME=%s\n", pathbuf);
}

void
adjust(struct inodesc *idesc, short lcnt)
{
        struct ext2fs_dinode *dp;

        dp = ginode(idesc->id_number);
        if (letoh16(dp->e2di_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 :
                        ((letoh16(dp->e2di_mode) & IFMT) == IFDIR ? "DIR" : "FILE"));
                pinode(idesc->id_number);
                printf(" COUNT %d SHOULD BE %d",
                        letoh16(dp->e2di_nlink), letoh16(dp->e2di_nlink) - lcnt);
                if (preen) {
                        if (lcnt < 0) {
                                printf("\n");
                                pfatal("LINK COUNT INCREASING");
                        }
                        printf(" (ADJUSTED)\n");
                }
                if (preen || reply("ADJUST") == 1) {
                        dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) - lcnt);
                        inodirty();
                }
        }
}

static int
mkentry(struct inodesc *idesc)
{
        struct ext2fs_direct *dirp = idesc->id_dirp;
        struct ext2fs_direct newent;
        int newlen, oldlen;

        newent.e2d_type = EXT2_FT_UNKNOWN;
        newent.e2d_namlen = strlen(idesc->id_name);
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                newent.e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
        newlen = EXT2FS_DIRSIZ(newent.e2d_namlen);
        if (dirp->e2d_ino != 0)
                oldlen = EXT2FS_DIRSIZ(dirp->e2d_namlen);
        else
                oldlen = 0;
        if (letoh16(dirp->e2d_reclen) - oldlen < newlen)
                return (KEEPON);
        newent.e2d_reclen = htole16(letoh16(dirp->e2d_reclen) - oldlen);
        dirp->e2d_reclen = htole16(oldlen);
        dirp = (struct ext2fs_direct *)(((char *)dirp) + oldlen);
        dirp->e2d_ino = htole32(idesc->id_parent); /* ino to be entered is in id_parent */
        dirp->e2d_reclen = newent.e2d_reclen;
        dirp->e2d_namlen = newent.e2d_namlen;
        dirp->e2d_type = newent.e2d_type;
        memcpy(dirp->e2d_name, idesc->id_name, (size_t)(dirp->e2d_namlen));
        return (ALTERED|STOP);
}

static int
chgino(struct inodesc *idesc)
{
        struct ext2fs_direct *dirp = idesc->id_dirp;
        u_int16_t namlen = dirp->e2d_namlen;

        if (strlen(idesc->id_name) != namlen ||
                strncmp(dirp->e2d_name, idesc->id_name, (int)namlen))
                return (KEEPON);
        dirp->e2d_ino = htole32(idesc->id_parent);
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                dirp->e2d_type = inot2ext2dt(typemap[idesc->id_parent]);
        else
                dirp->e2d_type = 0;
        return (ALTERED|STOP);
}

int
linkup(ino_t orphan, ino_t parentdir)
{
        struct ext2fs_dinode *dp;
        int lostdir;
        ino_t oldlfdir;
        struct inodesc idesc;
        char tempname[BUFSIZ];

        memset(&idesc, 0, sizeof(struct inodesc));
        dp = ginode(orphan);
        lostdir = (letoh16(dp->e2di_mode) & IFMT) == IFDIR;
        pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
        pinode(orphan);
        if (preen && inosize(dp) == 0)
                return (0);
        if (preen)
                printf(" (RECONNECTED)\n");
        else
                if (reply("RECONNECT") == 0)
                        return (0);
        if (lfdir == 0) {
                dp = ginode(EXT2_ROOTINO);
                idesc.id_name = lfname;
                idesc.id_type = DATA;
                idesc.id_func = findino;
                idesc.id_number = EXT2_ROOTINO;
                if ((ckinode(dp, &idesc) & FOUND) != 0) {
                        lfdir = idesc.id_parent;
                } else {
                        pwarn("NO lost+found DIRECTORY");
                        if (preen || reply("CREATE")) {
                                lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode);
                                if (lfdir != 0) {
                                        if (makeentry(EXT2_ROOTINO, lfdir, lfname) != 0) {
                                                if (preen)
                                                        printf(" (CREATED)\n");
                                        } else {
                                                freedir(lfdir, EXT2_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 ((letoh16(dp->e2di_mode) & IFMT) != IFDIR) {
                pfatal("lost+found IS NOT A DIRECTORY");
                if (reply("REALLOCATE") == 0)
                        return (0);
                oldlfdir = lfdir;
                if ((lfdir = allocdir(EXT2_ROOTINO, (ino_t)0, lfmode)) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        return (0);
                }
                if ((changeino(EXT2_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->e2di_nlink = htole16(letoh16(dp->e2di_nlink) +1);
                inodirty();
                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, 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 ext2fs_dinode *dp;
        struct inodesc idesc;
        char pathbuf[PATH_MAX + 1];

        if ((parent < EXT2_FIRSTINO && parent != EXT2_ROOTINO)
                || parent >= maxino ||
            (ino < EXT2_FIRSTINO && ino < EXT2_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 (inosize(dp) % sblock.e2fs_bsize) {
                inossize(dp, roundup(inosize(dp), sblock.e2fs_bsize));
                inodirty();
        }
        if ((ckinode(dp, &idesc) & ALTERED) != 0)
                return (1);
        getpathname(pathbuf, sizeof 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 ext2fs_dinode *dp, char *name)
{
        daddr32_t lastbn, newblk;
        struct bufarea *bp;
        char *firstblk;

        lastbn = lblkno(&sblock, inosize(dp));
        if (lastbn >= NDADDR - 1 || letoh32(dp->e2di_blocks[lastbn]) == 0 ||
                inosize(dp) == 0)
                return (0);
        if ((newblk = allocblk()) == 0)
                return (0);
        dp->e2di_blocks[lastbn + 1] = dp->e2di_blocks[lastbn];
        dp->e2di_blocks[lastbn] = htole32(newblk);
        inossize(dp, inosize(dp) + sblock.e2fs_bsize);
        dp->e2di_nblock = htole32(letoh32(dp->e2di_nblock) + 1);
        bp = getdirblk(letoh32(dp->e2di_blocks[lastbn + 1]),
                sblock.e2fs_bsize);
        if (bp->b_errs)
                goto bad;
        if ((firstblk = malloc(sblock.e2fs_bsize)) == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(8);
        }
        memcpy(firstblk, bp->b_un.b_buf, sblock.e2fs_bsize);
        bp = getdirblk(newblk, sblock.e2fs_bsize);
        if (bp->b_errs) {
                free(firstblk);
                goto bad;
        }
        memcpy(bp->b_un.b_buf, firstblk, sblock.e2fs_bsize);
        free(firstblk);
        dirty(bp);
        bp = getdirblk(letoh32(dp->e2di_blocks[lastbn + 1]),
                sblock.e2fs_bsize);
        if (bp->b_errs)
                goto bad;
        emptydir.dot_reclen = htole16(sblock.e2fs_bsize);
        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->e2di_blocks[lastbn] = dp->e2di_blocks[lastbn + 1];
        dp->e2di_blocks[lastbn + 1] = 0;
        dp->e2di_size = htole32(letoh32(dp->e2di_size) - sblock.e2fs_bsize);
        inossize(dp, inosize(dp) - sblock.e2fs_bsize);
        dp->e2di_nblock = htole32(letoh32(dp->e2di_nblock) - 1);
        freeblk(newblk);
        return (0);
}

/*
 * allocate a new directory
 */
int
allocdir(ino_t parent, ino_t request, int mode)
{
        ino_t ino;
        struct ext2fs_dinode *dp;
        struct bufarea *bp;
        struct ext2fs_dirtemplate *dirp;

        ino = allocino(request, IFDIR|mode);
        dirhead.dot_reclen = htole16(12); /* XXX */
        dirhead.dotdot_reclen = htole16(sblock.e2fs_bsize - 12); /* XXX */
        dirhead.dot_namlen = 1;
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                dirhead.dot_type = EXT2_FT_DIR;
        else
                dirhead.dot_type = 0;
        dirhead.dotdot_namlen = 2;
        if (sblock.e2fs.e2fs_rev > E2FS_REV0 &&
            (sblock.e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE))
                dirhead.dotdot_type = EXT2_FT_DIR;
        else
                dirhead.dotdot_type = 0;
        dirp = &dirhead;
        dirp->dot_ino = htole32(ino);
        dirp->dotdot_ino = htole32(parent);
        dp = ginode(ino);
        bp = getdirblk(letoh32(dp->e2di_blocks[0]), sblock.e2fs_bsize);
        if (bp->b_errs) {
                freeino(ino);
                return (0);
        }
        memcpy(bp->b_un.b_buf, dirp, sizeof(struct ext2fs_dirtemplate));
        dirty(bp);
        dp->e2di_nlink = htole16(2);
        inodirty();
        if (ino == EXT2_ROOTINO) {
                lncntp[ino] = letoh16(dp->e2di_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] = letoh16(dp->e2di_nlink);
                lncntp[parent]++;
        }
        dp = ginode(parent);
        dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) + 1);
        inodirty();
        return (ino);
}

/*
 * free a directory inode
 */
static void
freedir(ino_t ino, ino_t parent)
{
        struct ext2fs_dinode *dp;

        if (ino != parent) {
                dp = ginode(parent);
                dp->e2di_nlink = htole16(letoh16(dp->e2di_nlink) - 1);
                inodirty();
        }
        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);
}

/*
 * Get a directory block.
 * Insure that it is held until another is requested.
 */
static struct bufarea *
getdirblk(daddr32_t blkno, long size)
{

        if (pdirbp != 0)
                pdirbp->b_flags &= ~B_INUSE;
        pdirbp = getdatablk(blkno, size);
        return (pdirbp);
}