/*      $NetBSD: dir.c,v 1.62 2023/07/04 20:40:53 riastradh 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/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)dir.c       8.8 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: dir.c,v 1.62 2023/07/04 20:40:53 riastradh Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

#include <err.h>
#include <stdio.h>
#include <string.h>

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

const char      *lfname = "lost+found";
int     lfmode = 01700;
ino_t   lfdir;
struct  dirtemplate emptydir = {
        .dot_ino = 0,
        .dot_reclen = UFS_DIRBLKSIZ,
};
struct  dirtemplate dirhead = {
        .dot_ino = 0,
        .dot_reclen = 12,
        .dot_type = DT_DIR,
        .dot_namlen = 1,
        .dot_name = ".",
        .dotdot_ino = 0,
        .dotdot_reclen = UFS_DIRBLKSIZ - 12,
        .dotdot_type = DT_DIR,
        .dotdot_namlen = 2,
        .dotdot_name = "..",
};
struct  odirtemplate odirhead = {
        .dot_ino = 0,
        .dot_reclen = 12,
        .dot_namlen = 1,
        .dot_name = ".",
        .dotdot_ino = 0,
        .dotdot_reclen = UFS_DIRBLKSIZ - 12,
        .dotdot_namlen = 2,
        .dotdot_name = "..",
};

static int chgino(struct  inodesc *);
static int dircheck(struct inodesc *, struct direct *, struct bufarea *);
static int expanddir(union 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 *);
void reparent(ino_t, ino_t);

/*
 * Propagate connected state through the tree.
 */
void
propagate(ino_t inumber)
{
        struct inoinfo *inp;

        inp = getinoinfo(inumber);

        for (;;) {
                inoinfo(inp->i_number)->ino_state = DMARK;
                if (inp->i_child &&
                    inoinfo(inp->i_child->i_number)->ino_state != DMARK)
                        inp = inp->i_child;
                else if (inp->i_number == inumber)
                        break;
                else if (inp->i_sibling)
                        inp = inp->i_sibling;
                else
                        inp = getinoinfo(inp->i_parent);
        }

        for (;;) {
                inoinfo(inp->i_number)->ino_state = DFOUND;
                if (inp->i_child &&
                    inoinfo(inp->i_child->i_number)->ino_state != DFOUND)
                        inp = inp->i_child;
                else if (inp->i_number == inumber)
                        break;
                else if (inp->i_sibling)
                        inp = inp->i_sibling;
                else
                        inp = getinoinfo(inp->i_parent);
        }
}

void
reparent(ino_t inumber, ino_t parent)
{
        struct inoinfo *inp, *pinp;

        inp = getinoinfo(inumber);
        inp->i_parent = inp->i_dotdot = parent;
        pinp = getinoinfo(parent);
        inp->i_sibling = pinp->i_child;
        pinp->i_child = inp;
        propagate(inumber);
}

#if (BYTE_ORDER == LITTLE_ENDIAN)
# define NEEDSWAP       (!needswap)
#else
# define NEEDSWAP       (needswap)
#endif

static void
dirswap(void *dbuf)
{
        struct direct *tdp = (struct direct *)dbuf;
        u_char tmp;

        tmp = tdp->d_namlen;
        tdp->d_namlen = tdp->d_type;
        tdp->d_type = tmp;
}

/*
 * Scan each entry in a directory block.
 */
int
dirscan(struct inodesc *idesc)
{
        struct direct *dp;
        struct bufarea *bp;
        int dsize, n;
        long blksiz;
#if !defined(NO_APPLE_UFS) && UFS_DIRBLKSIZ < APPLEUFS_DIRBLKSIZ
        char dbuf[APPLEUFS_DIRBLKSIZ];
#else
        char dbuf[UFS_DIRBLKSIZ];
#endif

        if (idesc->id_type != DATA)
                errexit("wrong type to dirscan %d", 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);
        }

        /*
         * If we are swapping byte order in directory entries, just swap
         * this block and return.
         */
        if (do_dirswap) {
                int off;
                bp = getdirblk(idesc->id_blkno, blksiz);
                for (off = 0; off < blksiz; off += iswap16(dp->d_reclen)) {
                        dp = (struct direct *)(bp->b_un.b_buf + off);
                        dp->d_ino = bswap32(dp->d_ino);
                        dp->d_reclen = bswap16(dp->d_reclen);
                        if (!newinofmt) {
                                u_int8_t tmp = dp->d_namlen;
                                dp->d_namlen = dp->d_type;
                                dp->d_type = tmp;
                        }
                        if (dp->d_reclen == 0)
                                break;
                }
                dirty(bp);
                idesc->id_filesize -= blksiz;
                return (idesc->id_filesize > 0 ? KEEPON : STOP);
        }

        idesc->id_loc = 0;
        for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
                dsize = iswap16(dp->d_reclen);
                if (dsize > (int)sizeof dbuf)
                        dsize = sizeof dbuf;
                memmove(dbuf, dp, (size_t)dsize);
                if (!newinofmt && NEEDSWAP)
                        dirswap(dbuf);
                idesc->id_dirp = (struct direct *)dbuf;
                if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
                        if (!newinofmt && !doinglevel2 && NEEDSWAP)
                                dirswap(dbuf);
                        bp = getdirblk(idesc->id_blkno, blksiz);
                        memmove(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)
{
        struct direct *dp, *ndp;
        struct bufarea *bp;
        long size, blksiz, fix, dploc;

        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, bp))
                        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 = iswap16(dirblksiz);
                dp->d_ino = 0;
                dp->d_type = 0;
                dp->d_namlen = 0;
                dp->d_name[0] = '\0';
                if (fix)
                        dirty(bp);
                else
                        markclean = 0;
                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 += iswap16(dp->d_reclen);
        idesc->id_filesize -= iswap16(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, bp) == 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 = iswap16(iswap16(dp->d_reclen) + size);
                if (fix)
                        dirty(bp);
                else
                        markclean = 0;
        }
        return (dp);
}

/*
 * Verify that a directory entry is valid.
 * This is a superset of the checks made in the kernel.
 * Returns:
 *      1: good
 *      0: bad
 */
static int
dircheck(struct inodesc *idesc, struct direct *dp, struct bufarea *bp)
{
        uint8_t namlen, type;
        uint16_t reclen;
        uint32_t ino;
        char *cp;
        int size, spaceleft, modified, unused, i;

        modified = 0;
        spaceleft = dirblksiz - (idesc->id_loc % dirblksiz);

        /* fill in the correct info for our fields */
        ino = iswap32(dp->d_ino);
        reclen = iswap16(dp->d_reclen);
        if (!newinofmt && NEEDSWAP) {
                type = dp->d_namlen;
                namlen = dp->d_type;
        } else {
                namlen = dp->d_namlen;
                type = dp->d_type;
        }

        if (ino >= maxino ||
            reclen == 0 || reclen > spaceleft || (reclen & 0x3) != 0)
                goto bad;

        size = UFS_DIRSIZ(!newinofmt, dp, needswap);
        if (ino == 0) {
                /*
                 * Special case of an unused directory entry. Normally
                 * the kernel would coalesce unused space with the previous
                 * entry by extending its d_reclen, but there are situations
                 * (e.g. fsck) where that doesn't occur.
                 * If we're clearing out directory cruft (-z flag), then make
                 * sure this entry gets fully cleared as well.
                 */
                if (!zflag || fswritefd < 0)
                        return 1;

                if (dp->d_type != 0) {
                        dp->d_type = 0;
                        modified = 1;
                }
                if (dp->d_namlen != 0) {
                        dp->d_namlen = 0;
                        modified = 1;
                }
                if (dp->d_name[0] != '\0') {
                        dp->d_name[0] = '\0';
                        modified = 1;
                }
                goto good;
        }

        if (reclen < size || idesc->id_filesize < size ||
            /* namlen > MAXNAMLEN || */
            type > 15)
                goto bad;

        for (cp = dp->d_name, i = 0; i < namlen; i++)
                if (*cp == '\0' || (*cp++ == '/'))
                        goto bad;

        if (*cp != '\0')
                goto bad;

        if (!zflag || fswritefd < 0)
                return 1;
good:
        /*
         * Clear unused directory entry space, including the d_name
         * padding.
         */
        /* First figure the number of pad bytes. */
        unused = UFS_NAMEPAD(namlen);

        /* Add in the free space to the end of the record. */
        unused += iswap16(dp->d_reclen) - size;

        /*
         * Now clear out the unused space, keeping track if we actually
         * changed anything.
         */
        for (cp = &dp->d_name[namlen]; unused > 0; unused--, cp++) {
                if (*cp == '\0')
                        continue;
                *cp = '\0';
                modified = 1;
        }

        /* mark dirty so we update the zeroed space */
        if (modified)
                dirty(bp);
        return 1;
bad:
        if (debug)
                printf("Bad dir: ino %d reclen %d namlen %d type %d name %s\n",
                    ino, reclen, namlen, type, dp->d_name);
        return 0;
}

void
direrror(ino_t ino, const char *errmesg)
{

        fileerror(ino, ino, errmesg);
}

void
fileerror(ino_t cwd, ino_t ino, const char *errmesg)
{
        union dinode *dp;
        char pathbuf[MAXPATHLEN + 1];
        uint16_t mode;

        pwarn("%s ", errmesg);
        pinode(ino);
        printf("\n");
        getpathname(pathbuf, sizeof(pathbuf), cwd, ino);
        if (ino < UFS_ROOTINO || ino > maxino) {
                pfatal("NAME=%s\n", pathbuf);
                return;
        }
        dp = ginode(ino);
        if (ftypeok(dp)) {
                mode = DIP(dp, mode);
                pfatal("%s=%s\n",
                    (iswap16(mode) & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
        }
        else
                pfatal("NAME=%s\n", pathbuf);
}

void
adjust(struct inodesc *idesc, int lcnt)
{
        union dinode *dp;
        int16_t nlink;
        int saveresolved;

        dp = ginode(idesc->id_number);
        nlink = iswap16(DIP(dp, nlink));
        if (nlink == lcnt) {
                /*
                 * If we have not hit any unresolved problems, are running
                 * in preen mode, and are on a file system using soft updates,
                 * then just toss any partially allocated files.
                 */
                if (resolved && preen && usedsoftdep) {
                        clri(idesc, "UNREF", 1);
                        return;
                } else {
                        /*
                         * The file system can be marked clean even if
                         * a file is not linked up, but is cleared.
                         * Hence, resolved should not be cleared when
                         * linkup is answered no, but clri is answered yes.
                         */
                        saveresolved = resolved;
                        if (linkup(idesc->id_number, (ino_t)0, NULL) == 0) {
                                resolved = saveresolved;
                                clri(idesc, "UNREF", 0);
                                return;
                        }
                        /*
                         * Account for the new reference created by linkup().
                         */
                        dp = ginode(idesc->id_number);
                        lcnt--;
                }
        }
        if (lcnt != 0) {
                pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
                        ((iswap16(DIP(dp, mode)) & IFMT) == IFDIR ?
                        "DIR" : "FILE"));
                pinode(idesc->id_number);
                printf(" COUNT %d SHOULD BE %d",
                        nlink, nlink - lcnt);
                if (preen || usedsoftdep) {
                        if (lcnt < 0) {
                                printf("\n");
                                pfatal("LINK COUNT INCREASING");
                        }
                        if (preen)
                                printf(" (ADJUSTED)\n");
                }
                if (preen || reply("ADJUST") == 1) {
                        DIP_SET(dp, nlink, iswap16(nlink - lcnt));
                        inodirty();
                } else
                        markclean = 0;
        }
}

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

        newent.d_namlen = strlen(idesc->id_name);
        newlen = UFS_DIRSIZ(0, &newent, 0);
        if (dirp->d_ino != 0)
                oldlen = UFS_DIRSIZ(0, dirp, 0);
        else
                oldlen = 0;
        if (iswap16(dirp->d_reclen) - oldlen < newlen)
                return (KEEPON);
        newent.d_reclen = iswap16(iswap16(dirp->d_reclen) - oldlen);
        dirp->d_reclen = iswap16(oldlen);
        dirp = (struct direct *)(((char *)dirp) + oldlen);
        /* ino to be entered is in id_parent */
        dirp->d_ino = iswap32(idesc->id_parent);
        dirp->d_reclen = newent.d_reclen;
        if (newinofmt)
                dirp->d_type = inoinfo(idesc->id_parent)->ino_type;
        else
                dirp->d_type = 0;
        dirp->d_namlen = newent.d_namlen;
        memmove(dirp->d_name, idesc->id_name, (size_t)newent.d_namlen + 1);
        /*
         * 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 && NEEDSWAP)
                dirswap(dirp);
        return (ALTERED|STOP);
}

static int
chgino(struct inodesc *idesc)
{
        struct direct *dirp = idesc->id_dirp;

        if (memcmp(dirp->d_name, idesc->id_name, (int)dirp->d_namlen + 1))
                return (KEEPON);
        dirp->d_ino = iswap32(idesc->id_parent);
        if (newinofmt)
                dirp->d_type = inoinfo(idesc->id_parent)->ino_type;
        else
                dirp->d_type = 0;
        return (ALTERED|STOP);
}

int
linkup(ino_t orphan, ino_t parentdir, char *name)
{
        union dinode *dp;
        int lostdir;
        ino_t oldlfdir;
        struct inodesc idesc;
        char tempname[BUFSIZ];
        int16_t nlink;
        uint16_t mode;

        memset(&idesc, 0, sizeof(struct inodesc));
        dp = ginode(orphan);
        mode = iswap16(DIP(dp, mode));
        nlink = iswap16(DIP(dp, nlink));
        lostdir = (mode & IFMT) == IFDIR;
        pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
        pinode(orphan);
        if (preen  && DIP(dp, size) == 0)
                return (0);
        if (preen)
                printf(" (RECONNECTED)\n");
        else
                if (reply("RECONNECT") == 0) {
                        markclean = 0;
                        return (0);
                }
        if (parentdir != 0)
                inoinfo(parentdir)->ino_linkcnt++;
        if (lfdir == 0) {
                dp = ginode(UFS_ROOTINO);
                idesc.id_name = lfname;
                idesc.id_type = DATA;
                idesc.id_func = findino;
                idesc.id_number = UFS_ROOTINO;
                idesc.id_uid = iswap32(DIP(dp, uid));
                idesc.id_gid = iswap32(DIP(dp, gid));
                if ((ckinode(dp, &idesc) & FOUND) != 0) {
                        lfdir = idesc.id_parent;
                } else {
                        pwarn("NO lost+found DIRECTORY");
                        if (preen || reply("CREATE")) {
                                lfdir = allocdir(UFS_ROOTINO, (ino_t)0, lfmode);
                                if (lfdir != 0) {
                                        if (makeentry(UFS_ROOTINO, lfdir, lfname) != 0) {
                                                numdirs++;
                                                if (preen)
                                                        printf(" (CREATED)\n");
                                        } else {
                                                freedir(lfdir, UFS_ROOTINO);
                                                lfdir = 0;
                                                if (preen)
                                                        printf("\n");
                                        }
                                }
                                if (lfdir != 0) {
                                        reparent(lfdir, UFS_ROOTINO);
                                }
                        }
                }
                if (lfdir == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        markclean = 0;
                        return (0);
                }
        }
        dp = ginode(lfdir);
        mode = DIP(dp, mode);
        mode = iswap16(mode);
        if ((mode & IFMT) != IFDIR) {
                pfatal("lost+found IS NOT A DIRECTORY");
                if (reply("REALLOCATE") == 0) {
                        markclean = 0;
                        return (0);
                }
                oldlfdir = lfdir;
                lfdir = allocdir(UFS_ROOTINO, (ino_t)0, lfmode);
                if (lfdir == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        markclean = 0;
                        return (0);
                }
                if ((changeino(UFS_ROOTINO, lfname, lfdir) & ALTERED) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        markclean = 0;
                        return (0);
                }
                inodirty();
                reparent(lfdir, UFS_ROOTINO);
                idesc.id_type = ADDR;
                idesc.id_func = pass4check;
                idesc.id_number = oldlfdir;
                adjust(&idesc, inoinfo(oldlfdir)->ino_linkcnt + 1);
                inoinfo(oldlfdir)->ino_linkcnt = 0;
                dp = ginode(lfdir);
        }
        if (inoinfo(lfdir)->ino_state != DFOUND) {
                pfatal("SORRY. NO lost+found DIRECTORY\n\n");
                markclean = 0;
                return (0);
        }
        (void)lftempname(tempname, orphan);
        if (makeentry(lfdir, orphan, (name ? name : tempname)) == 0) {
                pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
                printf("\n\n");
                markclean = 0;
                return (0);
        }
        inoinfo(orphan)->ino_linkcnt--;
        if (lostdir) {
                if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
                    parentdir != (ino_t)-1)
                        (void)makeentry(orphan, lfdir, "..");
                dp = ginode(lfdir);
                nlink = DIP(dp, nlink);
                DIP_SET(dp, nlink, iswap16(iswap16(nlink) + 1));
                inodirty();
                inoinfo(lfdir)->ino_linkcnt++;
                reparent(orphan, 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;
        union dinode *dp;

        dp = ginode(dir);
        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 */
        idesc.id_uid = iswap32(DIP(dp, uid));
        idesc.id_gid = iswap32(DIP(dp, gid));
        return (ckinode(dp, &idesc));
}

/*
 * make an entry in a directory
 */
int
makeentry(ino_t parent, ino_t ino, const char *name)
{
        union dinode *dp;
        struct inodesc idesc;
        char pathbuf[MAXPATHLEN + 1];

        if (parent < UFS_ROOTINO || parent >= maxino ||
            ino < UFS_ROOTINO || ino >= maxino)
                return (0);
        dp = ginode(parent);
        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;
        idesc.id_uid = iswap32(DIP(dp, uid));
        idesc.id_gid = iswap32(DIP(dp, gid));
        if (iswap64(DIP(dp, size)) % dirblksiz) {
                DIP_SET(dp, size,
                    iswap64(roundup(iswap64(DIP(dp, size)), dirblksiz)));
                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);
        update_uquot(idesc.id_number, idesc.id_uid, idesc.id_gid,
            btodb(sblock->fs_bsize), 0);
        return (ckinode(dp, &idesc) & ALTERED);
}

/*
 * Attempt to expand the size of a directory
 */
static int
expanddir(union dinode *dp, char *name)
{
        daddr_t lastbn, newblk, dirblk;
        struct bufarea *bp;
        char *cp;
#if !defined(NO_APPLE_UFS) && UFS_DIRBLKSIZ < APPLEUFS_DIRBLKSIZ
        char firstblk[APPLEUFS_DIRBLKSIZ];
#else
        char firstblk[UFS_DIRBLKSIZ];
#endif
        struct ufs1_dinode *dp1 = NULL;
        struct ufs2_dinode *dp2 = NULL;

        if (is_ufs2)
                dp2 = &dp->dp2;
        else
                dp1 = &dp->dp1;

        lastbn = ffs_lblkno(sblock, iswap64(DIP(dp, size)));
        if (lastbn >= UFS_NDADDR - 1 || DIP(dp, db[lastbn]) == 0 ||
            DIP(dp, size) == 0)
                return (0);
        if ((newblk = allocblk(sblock->fs_frag)) == 0)
                return (0);
        if (is_ufs2) {
                dp2->di_db[lastbn + 1] = dp2->di_db[lastbn];
                dp2->di_db[lastbn] = iswap64(newblk);
                dp2->di_size = iswap64(iswap64(dp2->di_size)+sblock->fs_bsize);
                dp2->di_blocks = iswap64(iswap64(dp2->di_blocks) +
                    btodb(sblock->fs_bsize));
                dirblk = iswap64(dp2->di_db[lastbn + 1]);
        } else {
                dp1->di_db[lastbn + 1] = dp1->di_db[lastbn];
                dp1->di_db[lastbn] = iswap32((int32_t)newblk);
                dp1->di_size = iswap64(iswap64(dp1->di_size)+sblock->fs_bsize);
                dp1->di_blocks = iswap32(iswap32(dp1->di_blocks) +
                    btodb(sblock->fs_bsize));
                dirblk = iswap32(dp1->di_db[lastbn + 1]);
        }
        bp = getdirblk(dirblk, ffs_sblksize(sblock, (daddr_t)DIP(dp, size), lastbn + 1));
        if (bp->b_errs)
                goto bad;
        memmove(firstblk, bp->b_un.b_buf, dirblksiz);
        bp = getdirblk(newblk, sblock->fs_bsize);
        if (bp->b_errs)
                goto bad;
        memmove(bp->b_un.b_buf, firstblk, dirblksiz);
        emptydir.dot_reclen = iswap16(dirblksiz);
        for (cp = &bp->b_un.b_buf[dirblksiz];
             cp < &bp->b_un.b_buf[sblock->fs_bsize];
             cp += dirblksiz)
                memmove(cp, &emptydir, sizeof emptydir);
        dirty(bp);
        bp = getdirblk(dirblk, ffs_sblksize(sblock, (daddr_t)DIP(dp, size), lastbn + 1));
        if (bp->b_errs)
                goto bad;
        memmove(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:
        if (is_ufs2) {
                dp2->di_db[lastbn] = dp2->di_db[lastbn + 1];
                dp2->di_db[lastbn + 1] = 0;
                dp2->di_size = iswap64(iswap64(dp2->di_size)-sblock->fs_bsize);
                dp2->di_blocks = iswap64(iswap64(dp2->di_blocks) -
                    btodb(sblock->fs_bsize));
        } else {
                dp1->di_db[lastbn] = dp1->di_db[lastbn + 1];
                dp1->di_db[lastbn + 1] = 0;
                dp1->di_size = iswap64(iswap64(dp1->di_size)-sblock->fs_bsize);
                dp1->di_blocks = iswap32(iswap32(dp1->di_blocks) -
                    btodb(sblock->fs_bsize));
        }
        freeblk(newblk, sblock->fs_frag);
        markclean = 0;
        return (0);
}

/*
 * allocate a new directory
 */
ino_t
allocdir(ino_t parent, ino_t request, int mode)
{
        ino_t ino;
        char *cp;
        union dinode *dp;
        struct bufarea *bp;
        struct inoinfo *inp;
        struct dirtemplate *dirp;
        daddr_t dirblk;

        ino = allocino(request, IFDIR|mode);
        if (ino < UFS_ROOTINO)
                return 0;
        update_uquot(ino, 0, 0, btodb(sblock->fs_fsize), 1);
        dirhead.dot_reclen = iswap16(12);
        dirhead.dotdot_reclen = iswap16(dirblksiz - 12);
        odirhead.dot_reclen = iswap16(12);
        odirhead.dotdot_reclen = iswap16(dirblksiz - 12);
        odirhead.dot_namlen = iswap16(1);
        odirhead.dotdot_namlen = iswap16(2);
        if (newinofmt)
                dirp = &dirhead;
        else
                dirp = (struct dirtemplate *)&odirhead;
        dirp->dot_ino = iswap32(ino);
        dirp->dotdot_ino = iswap32(parent);
        dp = ginode(ino);
        dirblk = is_ufs2 ? iswap64(dp->dp2.di_db[0])
                    : iswap32(dp->dp1.di_db[0]);
        bp = getdirblk(dirblk, sblock->fs_fsize);
        if (bp->b_errs) {
                freeino(ino);
                return (0);
        }
        memmove(bp->b_un.b_buf, dirp, sizeof(struct dirtemplate));
        emptydir.dot_reclen = iswap16(dirblksiz);
        for (cp = &bp->b_un.b_buf[dirblksiz];
             cp < &bp->b_un.b_buf[sblock->fs_fsize];
             cp += dirblksiz)
                memmove(cp, &emptydir, sizeof emptydir);
        dirty(bp);
        DIP_SET(dp, nlink, iswap16(2));
        inodirty();
        if (ino == UFS_ROOTINO) {
                inoinfo(ino)->ino_linkcnt = iswap16(DIP(dp, nlink));
                cacheino(dp, ino);
                return(ino);
        }
        if (inoinfo(parent)->ino_state != DSTATE &&
            inoinfo(parent)->ino_state != DFOUND) {
                freeino(ino);
                return (0);
        }
        cacheino(dp, ino);
        inp = getinoinfo(ino);
        inp->i_parent = parent;
        inp->i_dotdot = parent;
        inoinfo(ino)->ino_state = inoinfo(parent)->ino_state;
        if (inoinfo(ino)->ino_state == DSTATE) {
                inoinfo(ino)->ino_linkcnt = iswap16(DIP(dp, nlink));
                inoinfo(parent)->ino_linkcnt++;
        }
        dp = ginode(parent);
        DIP_SET(dp, nlink, iswap16(iswap16(DIP(dp, nlink)) + 1));
        inodirty();
        return (ino);
}

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

        if (ino != parent) {
                dp = ginode(parent);
                DIP_SET(dp, nlink, iswap16(iswap16(DIP(dp, 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(daddr_t blkno, long size)
{

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