/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/sysctl.h>

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

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

#include "fsck.h"

static struct   dirtemplate emptydir = {
        0, DIRBLKSIZ, DT_UNKNOWN, 0, "",
        0, 0, DT_UNKNOWN, 0, ""
};
static struct   dirtemplate dirhead = {
        0, 12, DT_DIR, 1, ".",
        0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};

static int chgino(struct inodesc *);
static int dircheck(struct inodesc *, struct bufarea *, struct direct *);
static int expanddir(struct inode *ip, char *name);
static struct direct *fsck_readdir(struct inodesc *);
static struct bufarea *getdirblk(ufs2_daddr_t blkno, long size);
static int lftempname(char *bufp, ino_t ino);
static int mkentry(struct inodesc *);

/*
 * Propagate connected state through the tree.
 */
void
propagate(void)
{
        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 (inoinfo(inp->i_parent)->ino_state == DFOUND &&
                            INO_IS_DUNFOUND(inp->i_number)) {
                                inoinfo(inp->i_number)->ino_state = DFOUND;
                                check_dirdepth(inp);
                                change++;
                        }
                }
        } while (change > 0);
}

/*
 * Check that the recorded depth of the directory is correct.
 */
void
check_dirdepth(struct inoinfo *inp)
{
        struct inoinfo *parentinp;
        struct inode ip;
        union dinode *dp;
        int saveresolved;
        size_t size;
        static int updateasked, dirdepthupdate;

        if ((parentinp = getinoinfo(inp->i_parent)) == NULL) {
                pfatal("check_dirdepth: UNKNOWN PARENT DIR");
                return;
        }
        /*
         * If depth is correct, nothing to do.
         */
        if (parentinp->i_depth + 1 == inp->i_depth)
                return;
        /*
         * Only the root inode should have depth of 0, so if any other
         * directory has a depth of 0 then this is an old filesystem
         * that has not been tracking directory depth. Ask just once
         * whether it should start tracking directory depth.
         */
        if (inp->i_depth == 0 && updateasked == 0) {
                updateasked = 1;
                if (preen) {
                        pwarn("UPDATING FILESYSTEM TO TRACK DIRECTORY DEPTH\n");
                        dirdepthupdate = 1;
                } else {
                        /*
                         * The file system can be marked clean even if
                         * a directory does not have the right depth.
                         * Hence, resolved should not be cleared when
                         * the filesystem does not update directory depths.
                         */
                        saveresolved = resolved;
                        dirdepthupdate =
                            reply("UPDATE FILESYSTEM TO TRACK DIRECTORY DEPTH");
                        resolved = saveresolved;
                }
        }
        /*
         * If we are not converting or we are running in no-write mode
         * there is nothing more to do.
         */
        if ((inp->i_depth == 0 && dirdepthupdate == 0) ||
            (fswritefd < 0 && bkgrdflag == 0))
                return;
        /*
         * Individual directory at wrong depth. Report it and correct if
         * in preen mode or ask if in interactive mode. Note that if a
         * directory is renamed to a new location that is at a different
         * level in the tree, its depth will be recalculated, but none of
         * the directories that it contains will be updated. Thus it is
         * not unexpected to find directories with incorrect depths. No
         * operational harm will come from this though new directory
         * placement in the subtree may not be as optimal until the depths
         * of the affected directories are corrected.
         *
         * To avoid much spurious output on otherwise clean filesystems
         * we only generate detailed output when the debug flag is given.
         */
        ginode(inp->i_number, &ip);
        dp = ip.i_dp;
        if (inp->i_depth != 0 && debug) {
                pwarn("DIRECTORY");
                prtinode(&ip);
                printf(" DEPTH %d SHOULD BE %d", inp->i_depth,
                    parentinp->i_depth + 1);
                if (preen == 0 && reply("ADJUST") == 0) {
                        irelse(&ip);
                        return;
                }
                if (preen)
                        printf(" (ADJUSTED)\n");
        }
        inp->i_depth = parentinp->i_depth + 1;
        if (bkgrdflag == 0) {
                DIP_SET(dp, di_dirdepth, inp->i_depth);
                inodirty(&ip);
        } else {
                cmd.value = inp->i_number;
                cmd.size = (int64_t)inp->i_depth - DIP(dp, di_dirdepth);
                if (debug)
                        printf("adjdepth ino %ld amt %jd\n", (long)cmd.value,
                            (intmax_t)cmd.size);
                size = MIBSIZE;
                if (sysctlnametomib("vfs.ffs.adjdepth", adjdepth, &size) < 0 ||
                    sysctl(adjdepth, MIBSIZE, 0, 0, &cmd, sizeof cmd) == -1)
                        rwerror("ADJUST INODE DEPTH", cmd.value);
        }
        irelse(&ip);
}

/*
 * Scan each entry in a directory block.
 */
int
dirscan(struct inodesc *idesc)
{
        struct direct *dp;
        struct bufarea *bp;
        u_int dsize, n;
        long blksiz;
        char dbuf[DIRBLKSIZ];

        if (idesc->id_type != DATA)
                errx(EEXIT, "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);
        }
        idesc->id_loc = 0;
        for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
                dsize = dp->d_reclen;
                if (dsize > sizeof(dbuf))
                        dsize = sizeof(dbuf);
                memmove(dbuf, dp, (size_t)dsize);
                idesc->id_dirp = (struct direct *)dbuf;
                if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
                        bp = getdirblk(idesc->id_blkno, blksiz);
                        if (bp->b_errs != 0)
                                return (STOP);
                        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 and verify the next entry in a directory.
 * We also verify that if there is another entry in the block that it is
 * valid, so if it is not valid it can be subsumed into the current entry. 
 */
static struct direct *
fsck_readdir(struct inodesc *idesc)
{
        struct direct *dp, *ndp;
        struct bufarea *bp;
        long size, blksiz, subsume_ndp;

        subsume_ndp = 0;
        blksiz = idesc->id_numfrags * sblock.fs_fsize;
        if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
                return (NULL);
        bp = getdirblk(idesc->id_blkno, blksiz);
        if (bp->b_errs != 0)
                return (NULL);
        dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
        /*
         * Only need to check current entry if it is the first in the
         * block, as later entries will have been checked in the
         * previous call to this function.
         */
        if (idesc->id_loc % DIRBLKSIZ != 0 || dircheck(idesc, bp, dp) != 0) {
                /*
                 * Current entry is good, update to point at next.
                 */
                idesc->id_loc += dp->d_reclen;
                idesc->id_filesize -= dp->d_reclen;
                /*
                 * If at end of directory block, just return this entry.
                 */
                if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz ||
                    idesc->id_loc % DIRBLKSIZ == 0)
                        return (dp);
                /*
                 * If the next entry good, return this entry.
                 */
                ndp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
                if (dircheck(idesc, bp, ndp) != 0)
                        return (dp);
                /*
                 * The next entry is bad, so subsume it and the remainder
                 * of this directory block into this entry.
                 */
                subsume_ndp = 1;
        }
        /*
         * Current or next entry is bad. Zap current entry or
         * subsume next entry into current entry as appropriate.
         */
        size = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
        idesc->id_loc += size;
        idesc->id_filesize -= size;
        if (idesc->id_fix == IGNORE)
                return (NULL);
        if (subsume_ndp) {
                memset(ndp, 0, size);
                dp->d_reclen += size;
        } else {
                memset(dp, 0, size);
                dp->d_reclen = size;
        }
        if (dofix(idesc, "DIRECTORY CORRUPTED"))
                dirty(bp);
        return (dp);
}

/*
 * Verify that a directory entry is valid.
 * This is a superset of the checks made in the kernel.
 * Also optionally clears padding and unused directory space.
 *
 * Returns 0 if the entry is bad, 1 if the entry is good.
 */
static int
dircheck(struct inodesc *idesc, struct bufarea *bp, struct direct *dp)
{
        size_t size;
        char *cp;
        u_int8_t namlen;
        int spaceleft, modified, unused;

        spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
        size = DIRSIZ(0, dp);
        if (dp->d_reclen == 0 ||
            dp->d_reclen > spaceleft ||
            dp->d_reclen < size ||
            idesc->id_filesize < size ||
            (dp->d_reclen & (DIR_ROUNDUP - 1)) != 0)
                goto bad;
        modified = 0;
        if (dp->d_ino == 0) {
                if (!zflag || fswritefd < 0)
                        return (1);
                /*
                 * Special case of an unused directory entry. Normally only
                 * occurs at the beginning of a directory block when the block
                 * contains no entries. Other than the first entry in a
                 * directory block, the kernel coalesces unused space with
                 * the previous entry by extending its d_reclen. However,
                 * when cleaning up a directory, fsck may set d_ino to zero
                 * in the middle of a directory block. If we're clearing out
                 * directory cruft (-z flag), then make sure that all directory
                 * space in entries with d_ino == 0 gets fully cleared.
                 */
                if (dp->d_type != 0) {
                        dp->d_type = 0;
                        modified = 1;
                }
                if (dp->d_namlen != 0) {
                        dp->d_namlen = 0;
                        modified = 1;
                }
                unused = dp->d_reclen - __offsetof(struct direct, d_name);
                for (cp = dp->d_name; unused > 0; unused--, cp++) {
                        if (*cp != '\0') {
                                *cp = '\0';
                                modified = 1;
                        }
                }
                if (modified)
                        dirty(bp);
                return (1);
        }
        /*
         * The d_type field should not be tested here. A bad type is an error
         * in the entry itself but is not a corruption of the directory
         * structure itself. So blowing away all the remaining entries in the
         * directory block is inappropriate. Rather the type error should be
         * checked in pass1 and fixed there.
         *
         * The name validation should also be done in pass1 although the
         * check to see if the name is longer than fits in the space
         * allocated for it (i.e., the *cp != '\0' fails after exiting the
         * loop below) then it really is a structural error that requires
         * the stronger action taken here.
         */
        namlen = dp->d_namlen;
        if (namlen == 0 || dp->d_type > 15)
                goto bad;
        for (cp = dp->d_name, size = 0; size < namlen; size++) {
                if (*cp == '\0' || *cp++ == '/')
                        goto bad;
        }
        if (*cp != '\0')
                goto bad;
        if (zflag && fswritefd >= 0) {
                /*
                 * Clear unused directory entry space, including the d_name
                 * padding.
                 */
                /* First figure the number of pad bytes. */
                unused = roundup2(namlen + 1, DIR_ROUNDUP) - (namlen + 1);

                /* Add in the free space to the end of the record. */
                unused += dp->d_reclen - DIRSIZ(0, dp);

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

bad:
        if (debug)
                printf("Bad dir: ino %d reclen %d namlen %d type %d name %s\n",
                    dp->d_ino, dp->d_reclen, dp->d_namlen, dp->d_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)
{
        struct inode ip;
        union dinode *dp;
        char pathbuf[MAXPATHLEN + 1];

        pwarn("%s ", errmesg);
        if (ino < UFS_ROOTINO || ino >= maxino) {
                pfatal("out-of-range inode number %ju", (uintmax_t)ino);
                return;
        }
        ginode(ino, &ip);
        dp = ip.i_dp;
        prtinode(&ip);
        printf("\n");
        getpathname(pathbuf, cwd, ino);
        if (ftypeok(dp))
                pfatal("%s=%s\n",
                    (DIP(dp, di_mode) & IFMT) == IFDIR ? "DIR" : "FILE",
                    pathbuf);
        else
                pfatal("NAME=%s\n", pathbuf);
        irelse(&ip);
}

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

        ginode(idesc->id_number, &ip);
        dp = ip.i_dp;
        if (DIP(dp, di_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 || bkgrdflag) && usedsoftdep) {
                        clri(idesc, "UNREF", 1);
                        irelse(&ip);
                        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);
                                irelse(&ip);
                                return;
                        }
                        /*
                         * Account for the new reference created by linkup().
                         */
                        lcnt--;
                }
        }
        if (lcnt != 0) {
                pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
                        ((DIP(dp, di_mode) & IFMT) == IFDIR ? "DIR" : "FILE"));
                prtinode(&ip);
                printf(" COUNT %d SHOULD BE %d",
                        DIP(dp, di_nlink), DIP(dp, di_nlink) - lcnt);
                if (preen || usedsoftdep) {
                        if (lcnt < 0) {
                                printf("\n");
                                pfatal("LINK COUNT INCREASING");
                        }
                        if (preen)
                                printf(" (ADJUSTED)\n");
                }
                if (preen || reply("ADJUST") == 1) {
                        if (bkgrdflag == 0) {
                                DIP_SET(dp, di_nlink, DIP(dp, di_nlink) - lcnt);
                                inodirty(&ip);
                        } else {
                                cmd.value = idesc->id_number;
                                cmd.size = -lcnt;
                                if (debug)
                                        printf("adjrefcnt ino %ld amt %lld\n",
                                            (long)cmd.value,
                                            (long long)cmd.size);
                                if (sysctl(adjrefcnt, MIBSIZE, 0, 0,
                                    &cmd, sizeof cmd) == -1)
                                        rwerror("ADJUST INODE LINK COUNT",
                                            cmd.value);
                        }
                }
        }
        irelse(&ip);
}

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 = DIRSIZ(0, &newent);
        if (dirp->d_ino != 0)
                oldlen = DIRSIZ(0, 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_type = inoinfo(idesc->id_parent)->ino_type;
        dirp->d_namlen = newent.d_namlen;
        memmove(dirp->d_name, idesc->id_name, (size_t)newent.d_namlen + 1);
        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 = idesc->id_parent;
        dirp->d_type = inoinfo(idesc->id_parent)->ino_type;
        return (ALTERED|STOP);
}

int
linkup(ino_t orphan, ino_t parentdir, char *name)
{
        struct inode ip;
        union dinode *dp;
        int lostdir, depth;
        ino_t oldlfdir;
        struct inoinfo *inp;
        struct inodesc idesc;
        char tempname[BUFSIZ];

        memset(&idesc, 0, sizeof(struct inodesc));
        ginode(orphan, &ip);
        dp = ip.i_dp;
        lostdir = (DIP(dp, di_mode) & IFMT) == IFDIR;
        pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
        prtinode(&ip);
        printf("\n");
        if (preen && DIP(dp, di_size) == 0) {
                irelse(&ip);
                return (0);
        }
        irelse(&ip);
        if (cursnapshot != 0) {
                pfatal("FILE LINKUP IN SNAPSHOT");
                return (0);
        }
        if (preen)
                printf(" (RECONNECTED)\n");
        else if (reply("RECONNECT") == 0)
                return (0);
        if (lfdir == 0) {
                ginode(UFS_ROOTINO, &ip);
                idesc.id_name = strdup(lfname);
                idesc.id_type = DATA;
                idesc.id_func = findino;
                idesc.id_number = UFS_ROOTINO;
                if ((ckinode(ip.i_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 {
                                                freedirino(lfdir, UFS_ROOTINO);
                                                lfdir = 0;
                                                if (preen)
                                                        printf("\n");
                                        }
                                }
                        }
                }
                irelse(&ip);
                free(idesc.id_name);
                if (lfdir == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
                        printf("\n\n");
                        return (0);
                }
        }
        ginode(lfdir, &ip);
        dp = ip.i_dp;
        if ((DIP(dp, di_mode) & IFMT) != IFDIR) {
                pfatal("lost+found IS NOT A DIRECTORY");
                if (reply("REALLOCATE") == 0) {
                        irelse(&ip);
                        return (0);
                }
                oldlfdir = lfdir;
                if ((lfdir = allocdir(UFS_ROOTINO, (ino_t)0, lfmode)) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        irelse(&ip);
                        return (0);
                }
                if ((changeino(UFS_ROOTINO, lfname, lfdir, 1) & ALTERED) == 0) {
                        pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
                        irelse(&ip);
                        return (0);
                }
                idesc.id_type = inoinfo(oldlfdir)->ino_idtype;
                idesc.id_func = freeblock;
                idesc.id_number = oldlfdir;
                adjust(&idesc, inoinfo(oldlfdir)->ino_linkcnt + 1);
                inoinfo(oldlfdir)->ino_linkcnt = 0;
                inodirty(&ip);
                irelse(&ip);
                ginode(lfdir, &ip);
                dp = ip.i_dp;
        }
        if (inoinfo(lfdir)->ino_state != DFOUND) {
                pfatal("SORRY. NO lost+found DIRECTORY\n\n");
                irelse(&ip);
                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");
                irelse(&ip);
                return (0);
        }
        inoinfo(orphan)->ino_linkcnt--;
        if (lostdir) {
                depth = DIP(dp, di_dirdepth) + 1;
                if ((changeino(orphan, "..", lfdir, depth) & ALTERED) == 0 &&
                    parentdir != (ino_t)-1)
                        (void)makeentry(orphan, lfdir, "..");
                DIP_SET(dp, di_nlink, DIP(dp, di_nlink) + 1);
                inodirty(&ip);
                inoinfo(lfdir)->ino_linkcnt++;
                pwarn("DIR I=%lu CONNECTED. ", (u_long)orphan);
                inp = getinoinfo(parentdir);
                if (parentdir != (ino_t)-1 && inp != NULL) {
                        printf("PARENT WAS I=%lu\n", (u_long)parentdir);
                        /*
                         * If the parent directory did not have to
                         * be replaced then because of the ordering
                         * guarantees, has had the link count incremented
                         * for the child, but no entry was made.  This
                         * fixes the parent link count so that fsck does
                         * not need to be rerun.
                         */
                        if ((inp->i_flags & INFO_NEW) != 0)
                                inoinfo(parentdir)->ino_linkcnt++;
                }
                if (preen == 0)
                        printf("\n");
        }
        irelse(&ip);
        return (1);
}

/*
 * fix an entry in a directory.
 */
int
changeino(ino_t dir, const char *name, ino_t newnum, int depth)
{
        struct inodesc idesc;
        struct inode ip;
        int error;

        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 = strdup(name);
        idesc.id_parent = newnum;       /* new value for name */
        ginode(dir, &ip);
        if (((error = ckinode(ip.i_dp, &idesc)) & ALTERED) && newnum != 0) {
                DIP_SET(ip.i_dp, di_dirdepth, depth);
                inodirty(&ip);
                getinoinfo(dir)->i_depth = depth;
        }
        free(idesc.id_name);
        irelse(&ip);
        return (error);
}

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

        if (parent < UFS_ROOTINO || parent >= maxino ||
            ino < UFS_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 = strdup(name);
        ginode(parent, &ip);
        dp = ip.i_dp;
        if (DIP(dp, di_size) % DIRBLKSIZ) {
                DIP_SET(dp, di_size, roundup(DIP(dp, di_size), DIRBLKSIZ));
                inodirty(&ip);
        }
        if ((ckinode(dp, &idesc) & ALTERED) != 0) {
                irelse(&ip);
                free(idesc.id_name);
                return (1);
        }
        getpathname(pathbuf, parent, parent);
        if (expanddir(&ip, pathbuf) == 0) {
                irelse(&ip);
                free(idesc.id_name);
                return (0);
        }
        retval = ckinode(dp, &idesc) & ALTERED;
        irelse(&ip);
        free(idesc.id_name);
        return (retval);
}

/*
 * Attempt to expand the size of a directory
 */
static int
expanddir(struct inode *ip, char *name)
{
        ufs2_daddr_t lastlbn, oldblk, newblk, indirblk;
        size_t filesize, lastlbnsize;
        struct bufarea *bp, *nbp;
        struct inodesc idesc;
        union dinode *dp;
        long cg, indiralloced;
        char *cp;

        nbp = NULL;
        indiralloced = newblk = indirblk = 0;
        memset(&idesc, 0, sizeof(struct inodesc));
        idesc.id_type = ADDR;
        pwarn("NO SPACE LEFT IN %s", name);
        if (!preen && reply("EXPAND") == 0)
                return (0);
        cg = ino_to_cg(&sblock, ip->i_number);
        dp = ip->i_dp;
        filesize = DIP(dp, di_size);
        lastlbn = lblkno(&sblock, filesize);
        /*
         * We only expand lost+found to a single indirect block.
         */
        if ((DIP(dp, di_mode) & IFMT) != IFDIR || filesize == 0 ||
            lastlbn >= UFS_NDADDR + NINDIR(&sblock))
                goto bad;
        /*
         * If last block is a fragment, expand it to a full size block.
         */
        lastlbnsize = sblksize(&sblock, filesize, lastlbn);
        if (lastlbnsize > 0 && lastlbnsize < sblock.fs_bsize) {
                oldblk = DIP(dp, di_db[lastlbn]);
                bp = getdirblk(oldblk, lastlbnsize);
                if (bp->b_errs)
                        goto bad;
                newblk = allocblk(cg, sblock.fs_frag, std_checkblkavail);
                if (newblk == 0)
                        goto bad;
                nbp = getdatablk(newblk, sblock.fs_bsize, BT_DIRDATA);
                if (nbp->b_errs)
                        goto bad;
                DIP_SET(dp, di_db[lastlbn], newblk);
                DIP_SET(dp, di_size, filesize + sblock.fs_bsize - lastlbnsize);
                DIP_SET(dp, di_blocks, DIP(dp, di_blocks) +
                    btodb(sblock.fs_bsize - lastlbnsize));
                inodirty(ip);
                memmove(nbp->b_un.b_buf, bp->b_un.b_buf, lastlbnsize);
                memset(&nbp->b_un.b_buf[lastlbnsize], 0,
                    sblock.fs_bsize - lastlbnsize);
                for (cp = &nbp->b_un.b_buf[lastlbnsize];
                     cp < &nbp->b_un.b_buf[sblock.fs_bsize];
                     cp += DIRBLKSIZ)
                        memmove(cp, &emptydir, sizeof emptydir);
                dirty(nbp);
                brelse(nbp);
                binval(bp);
                idesc.id_blkno = oldblk;
                idesc.id_numfrags = numfrags(&sblock, lastlbnsize);
                (void)freeblock(&idesc);
                if (preen)
                        printf(" (EXPANDED)\n");
                return (1);
        }
        if ((newblk = allocblk(cg, sblock.fs_frag, std_checkblkavail)) == 0)
                goto bad;
        bp = getdirblk(newblk, sblock.fs_bsize);
        if (bp->b_errs)
                goto bad;
        memset(bp->b_un.b_buf, 0, sblock.fs_bsize);
        for (cp = bp->b_un.b_buf;
             cp < &bp->b_un.b_buf[sblock.fs_bsize];
             cp += DIRBLKSIZ)
                memmove(cp, &emptydir, sizeof emptydir);
        dirty(bp);
        if (lastlbn < UFS_NDADDR) {
                DIP_SET(dp, di_db[lastlbn], newblk);
        } else {
                /*
                 * Allocate indirect block if needed.
                 */
                if ((indirblk = DIP(dp, di_ib[0])) == 0) {
                        indirblk = allocblk(cg, sblock.fs_frag,
                            std_checkblkavail);
                        if (indirblk == 0) {
                                binval(bp);
                                goto bad;
                        }
                        indiralloced = 1;
                }
                nbp = getdatablk(indirblk, sblock.fs_bsize, BT_LEVEL1);
                if (nbp->b_errs)
                        goto bad;
                if (indiralloced) {
                        memset(nbp->b_un.b_buf, 0, sblock.fs_bsize);
                        DIP_SET(dp, di_ib[0], indirblk);
                        DIP_SET(dp, di_blocks,
                            DIP(dp, di_blocks) + btodb(sblock.fs_bsize));
                        inodirty(ip);
                }
                IBLK_SET(nbp, lastlbn - UFS_NDADDR, newblk);
                dirty(nbp);
                brelse(nbp);
        }
        DIP_SET(dp, di_size, filesize + sblock.fs_bsize);
        DIP_SET(dp, di_blocks, DIP(dp, di_blocks) + btodb(sblock.fs_bsize));
        inodirty(ip);
        if (preen)
                printf(" (EXPANDED)\n");
        return (1);
bad:
        pfatal(" (EXPANSION FAILED)\n");
        if (nbp != NULL) {
                binval(bp);
                brelse(nbp);
        }
        if (newblk != 0) {
                idesc.id_blkno = newblk;
                idesc.id_numfrags = sblock.fs_frag;
                (void)freeblock(&idesc);
        }
        if (indiralloced) {
                idesc.id_blkno = indirblk;
                idesc.id_numfrags = sblock.fs_frag;
                (void)freeblock(&idesc);
        }
        return (0);
}

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

        ino = allocino(request, IFDIR|mode);
        if (ino == 0)
                return (0);
        dirp = &dirhead;
        dirp->dot_ino = ino;
        dirp->dotdot_ino = parent;
        ginode(ino, &ip);
        dp = ip.i_dp;
        bp = getdirblk(DIP(dp, di_db[0]), sblock.fs_fsize);
        if (bp->b_errs) {
                freeino(ino);
                irelse(&ip);
                return (0);
        }
        memmove(bp->b_un.b_buf, dirp, sizeof(struct dirtemplate));
        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, di_nlink, 2);
        inodirty(&ip);
        if (ino == UFS_ROOTINO) {
                inp = cacheino(dp, ino);
                inp->i_parent = parent;
                inp->i_dotdot = parent;
                inp->i_flags |= INFO_NEW;
                inoinfo(ino)->ino_type = DT_DIR;
                inoinfo(ino)->ino_linkcnt = DIP(dp, di_nlink);
                irelse(&ip);
                return(ino);
        }
        if (!INO_IS_DVALID(parent)) {
                freeino(ino);
                irelse(&ip);
                return (0);
        }
        inp = cacheino(dp, ino);
        inp->i_parent = parent;
        inp->i_dotdot = parent;
        inp->i_flags |= INFO_NEW;
        if ((parentinp = getinoinfo(inp->i_parent)) == NULL) {
                pfatal("allocdir: UNKNOWN PARENT DIR");
        } else {
                inp->i_depth = parentinp->i_depth + 1; 
                DIP_SET(dp, di_dirdepth, inp->i_depth);
                inodirty(&ip);
        }
        inoinfo(ino)->ino_type = DT_DIR;
        inoinfo(ino)->ino_state = inoinfo(parent)->ino_state;
        if (inoinfo(ino)->ino_state == DSTATE) {
                inoinfo(ino)->ino_linkcnt = DIP(dp, di_nlink);
                inoinfo(parent)->ino_linkcnt++;
        }
        irelse(&ip);
        ginode(parent, &ip);
        dp = ip.i_dp;
        DIP_SET(dp, di_nlink, DIP(dp, di_nlink) + 1);
        inodirty(&ip);
        irelse(&ip);
        return (ino);
}

/*
 * free a directory inode
 */
void
freedirino(ino_t ino, ino_t parent)
{
        struct inode ip;
        union dinode *dp;

        if (ino != parent) {
                ginode(parent, &ip);
                dp = ip.i_dp;
                DIP_SET(dp, di_nlink, DIP(dp, di_nlink) - 1);
                inodirty(&ip);
                irelse(&ip);
        }
        removecachedino(ino);
        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(ufs2_daddr_t blkno, long size)
{

        if (pdirbp != NULL && pdirbp->b_errs == 0)
                brelse(pdirbp);
        pdirbp = getdatablk(blkno, size, BT_DIRDATA);
        return (pdirbp);
}