/*      $NetBSD: traverse.c,v 1.56 2023/08/07 23:26:40 mrg Exp $        */

/*-
 * Copyright (c) 1980, 1988, 1991, 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[] = "@(#)traverse.c  8.7 (Berkeley) 6/15/95";
#else
__RCSID("$NetBSD: traverse.c,v 1.56 2023/08/07 23:26:40 mrg Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "dump.h"

#define HASDUMPEDFILE   0x1
#define HASSUBDIRS      0x2

static  int appendextdata(union dinode *dp);
static  void writeextdata(union dinode *dp, ino_t ino, int added);
static  int dirindir(ino_t, daddr_t, int, off_t *, u_int64_t *, int);
static  void dmpindir(union dinode *dp, ino_t, daddr_t, int, off_t *);
static  int searchdir(ino_t, daddr_t, long, off_t, u_int64_t *, int);

/*
 * This is an estimation of the number of TP_BSIZE blocks in the file.
 * It estimates the number of blocks in files with holes by assuming
 * that all of the blocks accounted for by di_blocks are data blocks
 * (when some of the blocks are usually used for indirect pointers);
 * hence the estimate may be high.
 */
int64_t
blockest(union dinode *dp)
{
        int64_t blkest, sizeest;

        /*
         * dp->di_size is the size of the file in bytes.
         * dp->di_blocks stores the number of sectors actually in the file.
         * If there are more sectors than the size would indicate, this just
         *      means that there are indirect blocks in the file or unused
         *      sectors in the last file block; we can safely ignore these
         *      (blkest = sizeest below).
         * If the file is bigger than the number of sectors would indicate,
         *      then the file has holes in it.  In this case we must use the
         *      block count to estimate the number of data blocks used, but
         *      we use the actual size for estimating the number of indirect
         *      dump blocks (sizeest vs. blkest in the indirect block
         *      calculation).
         */
        if (DIP(dp, flags) & SF_SNAPSHOT)
                return (1);
        blkest = howmany(ufs_fragroundup(ufsib,
            dbtob((u_int64_t)DIP(dp, blocks))), TP_BSIZE);
        sizeest = howmany(ufs_fragroundup(ufsib, DIP(dp, size)), TP_BSIZE);
        if (blkest > sizeest)
                blkest = sizeest;
        if (DIP(dp, size) > ufsib->ufs_bsize * UFS_NDADDR) {
                /* calculate the number of indirect blocks on the dump tape */
                blkest +=
                        howmany(sizeest - UFS_NDADDR * ufsib->ufs_bsize / TP_BSIZE,
                        TP_NINDIR);
        }
        return (blkest + 1);
}

/* Auxiliary macro to pick up files changed since previous dump. */
#define CHANGEDSINCE(dp, t) \
        (DIP((dp), mtime) >= (t) || DIP((dp), ctime) >= (t))

/* The WANTTODUMP macro decides whether a file should be dumped. */
#ifdef UF_NODUMP
#define WANTTODUMP(dp) \
        (CHANGEDSINCE(dp, iswap64(spcl.c_ddate)) && \
         (nonodump || (DIP((dp), flags) & UF_NODUMP) != UF_NODUMP))
#else
#define WANTTODUMP(dp) CHANGEDSINCE(dp, iswap64(spcl.c_ddate))
#endif

/*
 * Determine if given inode should be dumped
 */
void
mapfileino(ino_t ino, u_int64_t *tape_size, int *dirskipped)
{
        int mode;
        union dinode *dp;

        /*
         * Skip inode if we've already marked it for dumping
         */
        if (TSTINO(ino, usedinomap))
                return;
        dp = getino(ino);
        if (dp == NULL || (mode = (DIP(dp, mode) & IFMT)) == 0)
                return;
        /*
         * Skip WAPBL log file inodes.
         */
        if (DIP(dp, flags) & SF_LOG)
                return;
        /*
         * Put all dirs in dumpdirmap, inodes that are to be dumped in the
         * used map. All inode but dirs who have the nodump attribute go
         * to the usedinomap.
         */
        SETINO(ino, usedinomap);
        if (mode == IFDIR)
                SETINO(ino, dumpdirmap);
        if (WANTTODUMP(dp)) {
                SETINO(ino, dumpinomap);
                if (mode != IFREG && mode != IFDIR && mode != IFLNK)
                        *tape_size += 1;
                else
                        *tape_size += blockest(dp);
                return;
        }
        if (mode == IFDIR) {
#ifdef UF_NODUMP
                if (!nonodump && (DIP(dp, flags) & UF_NODUMP))
                        CLRINO(ino, usedinomap);
#endif
                *dirskipped = 1;
        }
}

/*
 * Dump pass 1.
 *
 * Walk the inode list for a file system to find all allocated inodes
 * that have been modified since the previous dump time. Also, find all
 * the directories in the file system.
 * disk may be NULL if dirv is NULL.
 */
int
mapfiles(ino_t maxino, u_int64_t *tape_size, char *diskname, char * const *dirv)
{
        int anydirskipped = 0;

        if (dirv != NULL) {
                char     curdir[MAXPATHLEN];
                FTS     *dirh;
                FTSENT  *entry;
                int      d;

                if (getcwd(curdir, sizeof(curdir)) == NULL) {
                        msg("Can't determine cwd: %s\n", strerror(errno));
                        dumpabort(0);
                }
                if ((dirh = fts_open(dirv, FTS_PHYSICAL|FTS_SEEDOT|FTS_XDEV,
                                    NULL)) == NULL) {
                        msg("fts_open failed: %s\n", strerror(errno));
                        dumpabort(0);
                }
                while ((entry = fts_read(dirh)) != NULL) {
                        switch (entry->fts_info) {
                        case FTS_DNR:           /* an error */
                        case FTS_ERR:
                        case FTS_NS:
                                msg("Can't fts_read %s: %s\n", entry->fts_path,
                                    strerror(errno));
                                /* FALLTHROUGH */
                        case FTS_DP:            /* already seen dir */
                                continue;
                        }
                        mapfileino(entry->fts_statp->st_ino, tape_size,
                            &anydirskipped);
                }
                (void)fts_close(dirh);

                /*
                 * Add any parent directories
                 */
                for (d = 0 ; dirv[d] != NULL ; d++) {
                        char path[MAXPATHLEN];

                        if (dirv[d][0] != '/')
                                (void)snprintf(path, sizeof(path), "%s/%s",
                                    curdir, dirv[d]);
                        else
                                (void)snprintf(path, sizeof(path), "%s",
                                    dirv[d]);
                        while (strcmp(path, diskname) != 0) {
                                char *p;
                                struct stat sb;

                                if (*path == '\0')
                                        break;
                                if ((p = strrchr(path, '/')) == NULL)
                                        break;
                                if (p == path)
                                        break;
                                *p = '\0';
                                if (stat(path, &sb) == -1) {
                                        msg("Can't stat %s: %s\n", path,
                                            strerror(errno));
                                        break;
                                }
                                mapfileino(sb.st_ino, tape_size, &anydirskipped);
                        }
                }

                /*
                 * Ensure that the root inode actually appears in the
                 * file list for a subdir
                 */
                mapfileino(UFS_ROOTINO, tape_size, &anydirskipped);
        } else {
                fs_mapinodes(maxino, tape_size, &anydirskipped);
        }
        /*
         * Restore gets very upset if the root is not dumped,
         * so ensure that it always is dumped.
         */
        SETINO(UFS_ROOTINO, dumpinomap);
        return (anydirskipped);
}

/*
 * Dump pass 2.
 *
 * Scan each directory on the file system to see if it has any modified
 * files in it. If it does, and has not already been added to the dump
 * list (because it was itself modified), then add it. If a directory
 * has not been modified itself, contains no modified files and has no
 * subdirectories, then it can be deleted from the dump list and from
 * the list of directories. By deleting it from the list of directories,
 * its parent may now qualify for the same treatment on this or a later
 * pass using this algorithm.
 */
int
mapdirs(ino_t maxino, u_int64_t *tape_size)
{
        union dinode *dp, di;
        int i, isdir, nodump;
        char *map;
        ino_t ino;
        off_t filesize;
        int ret, change = 0;
        daddr_t blk;

        isdir = 0;              /* XXX just to get gcc to shut up */
        for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
                if (((ino - 1) % NBBY) == 0)    /* map is offset by 1 */
                        isdir = *map++;
                else
                        isdir >>= 1;
                /*
                 * If dir has been removed from the used map, it's either
                 * because it had the nodump flag, or it inherited it from
                 * its parent. A directory can't be in dumpinomap if
                 * not in usedinomap, but we have to go throuh it anyway
                 * to propagate the nodump attribute.
                 */
                nodump = (TSTINO(ino, usedinomap) == 0);
                if ((isdir & 1) == 0 ||
                    (TSTINO(ino, dumpinomap) && nodump == 0))
                        continue;

                dp = getino(ino);
                /*
                 * inode buf may be changed in searchdir().
                 */
                if (is_ufs2)
                        di.dp2 = dp->dp2;
                else
                        di.dp1 = dp->dp1;
                filesize = DIP(&di, size);
                for (ret = 0, i = 0; filesize > 0 && i < UFS_NDADDR; i++) {
                        if (is_ufs2)
                                blk = iswap64(di.dp2.di_db[i]);
                        else
                                blk = iswap32(di.dp1.di_db[i]);
                        if (blk != 0)
                                ret |= searchdir(ino, blk,
                                        (long)ufs_dblksize(ufsib, &di, i),
                                        filesize, tape_size, nodump);
                        if (ret & HASDUMPEDFILE)
                                filesize = 0;
                        else
                                filesize -= ufsib->ufs_bsize;
                }
                for (i = 0; filesize > 0 && i < UFS_NIADDR; i++) {
                        if (is_ufs2)
                                blk = iswap64(di.dp2.di_ib[i]);
                        else
                                blk = iswap32(di.dp1.di_ib[i]);
                        if (blk == 0)
                                continue;
                        ret |= dirindir(ino, blk, i, &filesize,
                            tape_size, nodump);
                }
                if (ret & HASDUMPEDFILE) {
                        SETINO(ino, dumpinomap);
                        *tape_size += blockest(&di);
                        change = 1;
                        continue;
                }
                if (nodump) {
                        if (ret & HASSUBDIRS)
                                change = 1; /* subdirs have inherited nodump */
                        CLRINO(ino, dumpdirmap);
                } else if ((ret & HASSUBDIRS) == 0) {
                        if (!TSTINO(ino, dumpinomap)) {
                                CLRINO(ino, dumpdirmap);
                                change = 1;
                        }
                }
        }
        return (change);
}

/*
 * Read indirect blocks, and pass the data blocks to be searched
 * as directories. Quit as soon as any entry is found that will
 * require the directory to be dumped.
 */
static int
dirindir(ino_t ino, daddr_t blkno, int ind_level, off_t *filesize,
        u_int64_t *tape_size, int nodump)
{
        int ret = 0;
        int i;
        union {
                int64_t i64[MAXBSIZE / sizeof (int64_t)];
                int32_t i32[MAXBSIZE / sizeof (int32_t)];
        } idblk;

        bread(fsatoda(ufsib, blkno), (char *)&idblk, (int)ufsib->ufs_bsize);
        if (ind_level <= 0) {
                for (i = 0; *filesize > 0 && i < ufsib->ufs_nindir; i++) {
                        if (is_ufs2)
                                blkno = iswap64(idblk.i64[i]);
                        else
                                blkno = iswap32(idblk.i32[i]);
                        if (blkno != 0)
                                ret |= searchdir(ino, blkno,
                                    ufsib->ufs_bsize, *filesize,
                                    tape_size, nodump);
                        if (ret & HASDUMPEDFILE)
                                *filesize = 0;
                        else
                                *filesize -= ufsib->ufs_bsize;
                }
                return (ret);
        }
        ind_level--;
        for (i = 0; *filesize > 0 && i < ufsib->ufs_nindir; i++) {
                if (is_ufs2)
                        blkno = iswap64(idblk.i64[i]);
                else
                        blkno = iswap32(idblk.i32[i]);
                if (blkno != 0)
                        ret |= dirindir(ino, blkno, ind_level, filesize,
                            tape_size, nodump);
        }
        return (ret);
}

/*
 * Scan a disk block containing directory information looking to see if
 * any of the entries are on the dump list and to see if the directory
 * contains any subdirectories.
 */
static int
searchdir(ino_t dino, daddr_t blkno, long size, off_t filesize,
        u_int64_t *tape_size, int nodump)
{
        struct direct *dp;
        union dinode *ip;
        long loc, ret = 0;
        char *dblk;
        ino_t ino;

        dblk = malloc(size);
        if (dblk == NULL)
                quit("%s: cannot allocate directory memory", __func__);
        bread(fsatoda(ufsib, blkno), dblk, (int)size);
        if (filesize < size)
                size = filesize;
        for (loc = 0; loc < size; ) {
                dp = (struct direct *)(dblk + loc);
                if (dp->d_reclen == 0) {
                        msg("corrupted directory, inumber %llu\n",
                            (unsigned long long)dino);
                        break;
                }
                loc += iswap16(dp->d_reclen);
                if (dp->d_ino == 0)
                        continue;
                if (dp->d_name[0] == '.') {
                        if (dp->d_name[1] == '\0')
                                continue;
                        if (dp->d_name[1] == '.' && dp->d_name[2] == '\0')
                                continue;
                }
                ino = iswap32(dp->d_ino);
                if (nodump) {
                        ip = getino(ino);
                        if (TSTINO(ino, dumpinomap)) {
                                CLRINO(ino, dumpinomap);
                                *tape_size -= blockest(ip);
                        }
                        /*
                         * Add back to dumpdirmap and remove from usedinomap
                         * to propagate nodump.
                         */
                        if ((DIP(ip, mode) & IFMT) == IFDIR) {
                                SETINO(ino, dumpdirmap);
                                CLRINO(ino, usedinomap);
                                ret |= HASSUBDIRS;
                        }
                } else {
                        if (TSTINO(ino, dumpinomap)) {
                                ret |= HASDUMPEDFILE;
                                if (ret & HASSUBDIRS)
                                        break;
                        }
                        if (TSTINO(ino, dumpdirmap)) {
                                ret |= HASSUBDIRS;
                                if (ret & HASDUMPEDFILE)
                                        break;
                        }
                }
        }
        free(dblk);
        return (ret);
}

/*
 * Dump passes 3 and 4.
 *
 * Dump the contents of an inode to tape.
 */
void
dumpino(union dinode *dp, ino_t ino)
{
        int ind_level, cnt, last, added;
        off_t size;
        char buf[TP_BSIZE];
        daddr_t blk;
        void *shortlink;

        if (newtape) {
                newtape = 0;
                dumpmap(dumpinomap, TS_BITS, ino);
        }
        CLRINO(ino, dumpinomap);
        /*
         * Zero out the size of a snapshot so that it will be dumped
         * as a zero length file.
         */
        if (DIP(dp, flags) & SF_SNAPSHOT) {
                DIP_SET(dp, size, 0);
                DIP_SET(dp, flags, DIP(dp, flags) & ~SF_SNAPSHOT);
        }
        if (!is_ufs2) {
                if (needswap)
                        ffs_dinode1_swap(&dp->dp1, &spcl.c_dinode);
                else
                        spcl.c_dinode = dp->dp1;
                spcl.c_extsize = 0;
        } else {
                if (needswap)
                        ffs_dinode2_swap(&dp->dp2, &dp->dp2);
                spcl.c_mode = dp->dp2.di_mode;
                spcl.c_size = dp->dp2.di_size;
                spcl.c_extsize = dp->dp2.di_extsize;
                spcl.c_atime = dp->dp2.di_atime;
                spcl.c_atimensec = dp->dp2.di_atimensec;
                spcl.c_mtime = dp->dp2.di_mtime;
                spcl.c_mtimensec = dp->dp2.di_mtimensec;
                spcl.c_birthtime = dp->dp2.di_birthtime;
                spcl.c_birthtimensec = dp->dp2.di_birthnsec;
                spcl.c_rdev = dp->dp2.di_rdev;
                spcl.c_file_flags = dp->dp2.di_flags;
                spcl.c_uid = dp->dp2.di_uid;
                spcl.c_gid = dp->dp2.di_gid;
        }
        spcl.c_type = iswap32(TS_INODE);
        spcl.c_count = 0;
        switch (DIP(dp, mode) & IFMT) {

        case 0:
                /*
                 * Freed inode.
                 */
                return;

        case IFLNK:
                /*
                 * Check for short symbolic link.
                 */
                if (DIP(dp, size) > 0 &&
#ifdef FS_44INODEFMT
                    (DIP(dp, size) < ufsib->ufs_maxsymlinklen ||
                     (ufsib->ufs_maxsymlinklen == 0 && DIP(dp, blocks) == 0))
#else
                    DIP(dp, blocks) == 0
#endif
                        ) {
                        spcl.c_addr[0] = 1;
                        spcl.c_count = iswap32(1);
                        added = appendextdata(dp);
                        writeheader(ino);
                        if (is_ufs2)
                                shortlink = dp->dp2.di_db;
                        else
                                shortlink = dp->dp1.di_db;
                        memmove(buf, shortlink, DIP(dp, size));
                        buf[DIP(dp, size)] = '\0';
                        writerec(buf, 0);
                        writeextdata(dp, ino, added);
                        return;
                }
                /* fall through */

        case IFDIR:
        case IFREG:
                if (DIP(dp, size) > 0)
                        break;
                /* fall through */

        case IFIFO:
        case IFSOCK:
        case IFCHR:
        case IFBLK:
                added = appendextdata(dp);
                writeheader(ino);
                writeextdata(dp, ino, added);
                return;

        default:
                msg("Warning: undefined file type 0%o\n", DIP(dp, mode) & IFMT);
                return;
        }
        if (DIP(dp, size) > UFS_NDADDR * ufsib->ufs_bsize) {
                cnt = UFS_NDADDR * ufsib->ufs_frag;
                last = 0;
        } else {
                cnt = howmany(DIP(dp, size), ufsib->ufs_fsize);
                last = 1;
        }
        if (is_ufs2)
                blksout64(dp, &dp->dp2.di_db[0], cnt, ino, last);
        else
                blksout32(&dp->dp1.di_db[0], cnt, ino);

        if ((size = DIP(dp, size) - UFS_NDADDR * ufsib->ufs_bsize) <= 0)
                return;
        for (ind_level = 0; ind_level < UFS_NIADDR; ind_level++) {
                if (is_ufs2)
                        blk = iswap64(dp->dp2.di_ib[ind_level]);
                else
                        blk = iswap32(dp->dp1.di_ib[ind_level]);
                dmpindir(dp, ino, blk, ind_level, &size);
                if (size <= 0)
                        return;
        }
}

/*
 * Read indirect blocks, and pass the data blocks to be dumped.
 */
static void
dmpindir(union dinode *dp, ino_t ino, daddr_t blk, int ind_level, off_t *size)
{
        int i, cnt, last;
        union {
                int32_t i32[MAXBSIZE / sizeof (int32_t)];
                int64_t i64[MAXBSIZE / sizeof (int64_t)];
        } idblk;
        daddr_t iblk;


        if (blk != 0)
                bread(fsatoda(ufsib, blk), (char *)&idblk,
                        (int) ufsib->ufs_bsize);
        else
                memset(&idblk, 0, (int)ufsib->ufs_bsize);
        if (ind_level <= 0) {
                if (*size < ufsib->ufs_nindir * ufsib->ufs_bsize) {
                        cnt = howmany(*size, ufsib->ufs_fsize);
                        last = 0;
                } else {
                        cnt = ufsib->ufs_nindir * ufsib->ufs_frag;
                        last = 1;
                }
                *size -= ufsib->ufs_nindir * ufsib->ufs_bsize;
                if (is_ufs2)
                        blksout64(dp, &idblk.i64[0], cnt, ino, last);
                else
                        blksout32(&idblk.i32[0], cnt, ino);
                return;
        }
        ind_level--;
        for (i = 0; i < ufsib->ufs_nindir; i++) {
                if (is_ufs2)
                        iblk = iswap64(idblk.i64[i]);
                else
                        iblk = iswap32(idblk.i32[i]);
                dmpindir(dp, ino, iblk, ind_level, size);
                if (*size <= 0)
                        return;
        }
}

/*
 * Collect up the data into tape record sized buffers and output them.
 */
void
blksout32(int32_t *blkp, int frags, ino_t ino)
{
        int32_t *bp;
        int i, j, count, blks, tbperdb;

        blks = howmany(frags * ufsib->ufs_fsize, TP_BSIZE);
        tbperdb = ufsib->ufs_bsize >> tp_bshift;
        for (i = 0; i < blks; i += TP_NINDIR) {
                if (i + TP_NINDIR > blks)
                        count = blks;
                else
                        count = i + TP_NINDIR;
                for (j = i; j < count; j++)
                        if (blkp[j / tbperdb] != 0)
                                spcl.c_addr[j - i] = 1;
                        else
                                spcl.c_addr[j - i] = 0;
                spcl.c_count = iswap32(count - i);
                writeheader(ino);
                bp = &blkp[i / tbperdb];
                for (j = i; j < count; j += tbperdb, bp++)
                        if (*bp != 0) {
                                if (j + tbperdb <= count)
                                        dumpblock(iswap32(*bp), (int)ufsib->ufs_bsize);
                                else
                                        dumpblock(iswap32(*bp), (count - j) * TP_BSIZE);
                        }
                spcl.c_type = iswap32(TS_ADDR);
        }
}

void
blksout64(union dinode *dp, int64_t *blkp, int frags, ino_t ino, int last)
{
        int64_t *bp;
        int i, j, count, blks, tbperdb, added = 0;
        static int writingextdata = 0;

        blks = howmany(frags * ufsib->ufs_fsize, TP_BSIZE);
#if 0
        if (last) {
                int resid;
                int extsize = iswap32(spcl.c_extsize);
                if (writingextdata)
                        resid = howmany(ufsib->ufs_qfmask & extsize,
                            TP_BSIZE);
                else
                        resid = howmany(ufsib->ufs_qfmask & dp->dp2.di_size,
                            TP_BSIZE);
                if (resid > 0)
                        blks -= howmany(ufsib->ufs_fsize, TP_BSIZE) - resid;
        }
#endif
        tbperdb = ufsib->ufs_bsize >> tp_bshift;
        for (i = 0; i < blks; i += TP_NINDIR) {
                if (i + TP_NINDIR > blks)
                        count = blks;
                else
                        count = i + TP_NINDIR;
                assert(count <= TP_NINDIR + i);
                for (j = i; j < count; j++)
                        if (blkp[j / tbperdb] != 0)
                                spcl.c_addr[j - i] = 1;
                        else
                                spcl.c_addr[j - i] = 0;
                spcl.c_count = iswap32(count - i);
                if (last && count == blks && !writingextdata)
                        added = appendextdata(dp);
                writeheader(ino);
                bp = &blkp[i / tbperdb];
                for (j = i; j < count; j += tbperdb, bp++)
                        if (*bp != 0) {
                                if (j + tbperdb <= count)
                                        dumpblock(iswap64(*bp), (int)ufsib->ufs_bsize);
                                else
                                        dumpblock(iswap64(*bp), (count - j) * TP_BSIZE);
                        }
                spcl.c_type = iswap32(TS_ADDR);
                spcl.c_count = 0;
                if (last && count == blks && !writingextdata) {
                        writingextdata = 1;
                        writeextdata(dp, ino, added);
                        writingextdata = 0;
                }
        }
}

/*
 * If there is room in the current block for the extended attributes
 * as well as the file data, update the header to reflect the added
 * attribute data at the end. Attributes are placed at the end so that
 * old versions of restore will correctly restore the file and simply
 * discard the extra data at the end that it does not understand.
 * The attribute data is dumped following the file data by the
 * writeextdata() function (below).
 */
static int
appendextdata(union dinode *dp)
{
        int i, blks, tbperdb, count, extsize;

        count = iswap32(spcl.c_count);
        extsize = iswap32(spcl.c_extsize);
        /*
         * If no extended attributes, there is nothing to do.
         */
        if (extsize == 0)
                return (0);
        /*
         * If there is not enough room at the end of this block
         * to add the extended attributes, then rather than putting
         * part of them here, we simply push them entirely into a
         * new block rather than putting some here and some later.
         */
        if (extsize > UFS_NXADDR * ufsib->ufs_bsize)
                blks = howmany(UFS_NXADDR * ufsib->ufs_bsize, TP_BSIZE);
        else
                blks = howmany(extsize, TP_BSIZE);
        if (count + blks > TP_NINDIR)
                return (0);
        /*
         * Update the block map in the header to indicate the added
         * extended attribute. They will be appended after the file
         * data by the writeextdata() routine.
         */
        tbperdb = ufsib->ufs_bsize >> tp_bshift;
        assert(count + blks < TP_NINDIR);
        for (i = 0; i < blks; i++)
                if (dp->dp2.di_extb[i / tbperdb] != 0)
                                spcl.c_addr[count + i] = 1;
                        else
                                spcl.c_addr[count + i] = 0;
        spcl.c_count = iswap32(count + blks);
        return (blks);
}

/*
 * Dump the extended attribute data. If there was room in the file
 * header, then all we need to do is output the data blocks. If there
 * was not room in the file header, then an additional TS_ADDR header
 * is created to hold the attribute data.
 */
static void
writeextdata(union dinode *dp, ino_t ino, int added)
{
        int i, frags, blks, tbperdb, last, extsize;
        int64_t *bp;
        off_t size;

        extsize = iswap32(spcl.c_extsize);

        /*
         * If no extended attributes, there is nothing to do.
         */
        if (extsize == 0)
                return;
        /*
         * If there was no room in the file block for the attributes,
         * dump them out in a new block, otherwise just dump the data.
         */
        if (added == 0) {
                if (extsize > UFS_NXADDR * ufsib->ufs_bsize) {
                        frags = UFS_NXADDR * ufsib->ufs_frag;
                        last = 0;
                } else {
                        frags = howmany(extsize, ufsib->ufs_fsize);
                        last = 1;
                }
                blksout64(dp, &dp->dp2.di_extb[0], frags, ino, last);
        } else {
                if (extsize > UFS_NXADDR * ufsib->ufs_bsize)
                        blks = howmany(UFS_NXADDR * ufsib->ufs_bsize, TP_BSIZE);
                else
                        blks = howmany(extsize, TP_BSIZE);
                tbperdb = ufsib->ufs_bsize >> tp_bshift;
                for (i = 0; i < blks; i += tbperdb) {
                        bp = &dp->dp2.di_extb[i / tbperdb];
                        if (*bp != 0) {
                                if (i + tbperdb <= blks)
                                        dumpblock(iswap64(*bp), (int)ufsib->ufs_bsize);
                                else
                                        dumpblock(iswap64(*bp), (blks - i) * TP_BSIZE);
                        }
                }

        }
        /*
         * If an indirect block is added for extended attributes, then
         * di_exti below should be changed to the structure element
         * that references the extended attribute indirect block. This
         * definition is here only to make it compile without complaint.
         */
#define di_exti di_spare[0]
        /*
         * If the extended attributes fall into an indirect block,
         * dump it as well.
         */
        if ((size = extsize - UFS_NXADDR * ufsib->ufs_bsize) > 0)
                dmpindir(dp, ino, dp->dp2.di_exti, 0, &size);
}

/*
 * Dump a map to the tape.
 */
void
dumpmap(char *map, int type, ino_t ino)
{
        int i;
        char *cp;

        spcl.c_type = iswap32(type);
        spcl.c_count = iswap32(howmany(mapsize * sizeof(char), TP_BSIZE));
        writeheader(ino);
        for (i = 0, cp = map; i < iswap32(spcl.c_count); i++, cp += TP_BSIZE)
                writerec(cp, 0);
}

/*
 * Write a header record to the dump tape.
 */
void
writeheader(ino_t ino)
{
        int32_t sum, cnt, *lp;

        spcl.c_inumber = iswap32(ino);
        if (is_ufs2)
                spcl.c_magic = iswap32(FS_UFS2_MAGIC);
        else {
                spcl.c_magic = iswap32(NFS_MAGIC);
                spcl.c_old_date = iswap32(iswap64(spcl.c_date));
                spcl.c_old_ddate = iswap32(iswap64(spcl.c_ddate));
                spcl.c_old_tapea = iswap32(iswap64(spcl.c_tapea));
                spcl.c_old_firstrec = iswap32(iswap64(spcl.c_firstrec));
        }
        spcl.c_checksum = 0;
        lp = (int32_t *)&spcl;
        sum = 0;
        cnt = sizeof(union u_spcl) / (4 * sizeof(int32_t));
        while (--cnt >= 0) {
                sum += iswap32(*lp++);
                sum += iswap32(*lp++);
                sum += iswap32(*lp++);
                sum += iswap32(*lp++);
        }
        spcl.c_checksum = iswap32(CHECKSUM - sum);
        writerec((char *)&spcl, 1);
}