/*      $NetBSD: pass2.c,v 1.53 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[] = "@(#)pass2.c     8.9 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: pass2.c,v 1.53 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 <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

#define MINDIRSIZE      (sizeof (struct dirtemplate))

static int blksort(const void *, const void *);
static int pass2check(struct inodesc *);

void
pass2(void)
{
        union dinode *dp;
        struct inoinfo **inpp, *inp, *pinp;
        struct inoinfo **inpend;
        struct inostat *rinfo, *info;
        struct inodesc curino;
        union dinode dino;
        int i, maxblk;
#ifndef NO_FFS_EI
        unsigned ii;
#endif
        char pathbuf[MAXPATHLEN + 1];

        rinfo = inoinfo(UFS_ROOTINO);
        switch (rinfo->ino_state) {

        case USTATE:
                pfatal("ROOT INODE UNALLOCATED");
                if (reply("ALLOCATE") == 0) {
                        markclean = 0;
                        ckfini(1);
                        exit(FSCK_EXIT_CHECK_FAILED);
                }
                if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) != UFS_ROOTINO)
                        errexit("CANNOT ALLOCATE ROOT INODE");
                break;

        case DCLEAR:
                pfatal("DUPS/BAD IN ROOT INODE");
                if (reply("REALLOCATE")) {
                        freeino(UFS_ROOTINO);
                        if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) != UFS_ROOTINO)
                                errexit("CANNOT ALLOCATE ROOT INODE");
                        break;
                }
                markclean = 0;
                if (reply("CONTINUE") == 0) {
                        ckfini(1);
                        exit(FSCK_EXIT_CHECK_FAILED);
                }
                break;

        case FSTATE:
        case FCLEAR:
                pfatal("ROOT INODE NOT DIRECTORY");
                if (reply("REALLOCATE")) {
                        freeino(UFS_ROOTINO);
                        if (allocdir(UFS_ROOTINO, UFS_ROOTINO, 0755) != UFS_ROOTINO)
                                errexit("CANNOT ALLOCATE ROOT INODE");
                        break;
                }
                if (reply("FIX") == 0) {
                        markclean = 0;
                        ckfini(1);
                        exit(FSCK_EXIT_CHECK_FAILED);
                }
                dp = ginode(UFS_ROOTINO);
                DIP_SET(dp, mode,
                    iswap16((iswap16(DIP(dp, mode)) & ~IFMT) | IFDIR));
                inodirty();
                break;

        case DSTATE:
                break;

        default:
                errexit("BAD STATE %d FOR ROOT INODE", rinfo->ino_state);
        }
        if (newinofmt) {
                info = inoinfo(UFS_WINO);
                info->ino_state = FSTATE;
                info->ino_type = DT_WHT;
        }
        /*
         * Sort the directory list into disk block order.
         */
        qsort((char *)inpsort, (size_t)inplast, sizeof *inpsort, blksort);
        /*
         * Check the integrity of each directory.
         */
        memset(&curino, 0, sizeof(struct inodesc));
        curino.id_type = DATA;
        curino.id_func = pass2check;
        inpend = &inpsort[inplast];
        for (inpp = inpsort; inpp < inpend; inpp++) {
                if (got_siginfo) {
                        fprintf(stderr,
                            "%s: phase 2: dir %ld of %d (%d%%)\n", cdevname(),
                            (long)(inpp - inpsort), (int)inplast,
                            (int)((inpp - inpsort) * 100 / inplast));
                        got_siginfo = 0;
                }
#ifdef PROGRESS
                progress_bar(cdevname(), preen ? NULL : "phase 2",
                            (inpp - inpsort), inplast);
#endif /* PROGRESS */
                inp = *inpp;
                if (inp->i_isize == 0)
                        continue;
                if (inp->i_isize < MINDIRSIZE) {
                        direrror(inp->i_number, "DIRECTORY TOO SHORT");
                        inp->i_isize = roundup(MINDIRSIZE, dirblksiz);
                        if (reply("FIX") == 1) {
                                dp = ginode(inp->i_number);
                                DIP_SET(dp, size, iswap64(inp->i_isize));
                                inodirty();
                        } else
                                markclean = 0;
                } else if ((inp->i_isize & (dirblksiz - 1)) != 0) {
                        getpathname(pathbuf, sizeof(pathbuf), inp->i_number,
                            inp->i_number);
                        if (usedsoftdep)
                                pfatal("%s %s: LENGTH %lld NOT MULTIPLE OF %d",
                                        "DIRECTORY", pathbuf,
                                        (long long)inp->i_isize, dirblksiz);
                        else
                                pwarn("%s %s: LENGTH %lld NOT MULTIPLE OF %d",
                                        "DIRECTORY", pathbuf,
                                        (long long)inp->i_isize, dirblksiz);
                        if (preen)
                                printf(" (ADJUSTED)\n");
                        inp->i_isize = roundup(inp->i_isize, dirblksiz);
                        if (preen || reply("ADJUST") == 1) {
                                dp = ginode(inp->i_number);
                                DIP_SET(dp, size, iswap64(inp->i_isize));
                                inodirty();
                        } else
                                markclean = 0;
                }
                memset(&dino, 0, sizeof dino);
                dp = &dino;
                if (!is_ufs2) {
                        dp->dp1.di_mode = iswap16(IFDIR);
                        dp->dp1.di_size = iswap64(inp->i_isize);
                        maxblk = inp->i_numblks < UFS_NDADDR ? inp->i_numblks :
                            UFS_NDADDR;
                        for (i = 0; i < maxblk; i++)
                                dp->dp1.di_db[i] = inp->i_blks[i];
                        if (inp->i_numblks > UFS_NDADDR) {
                                for (i = 0; i < UFS_NIADDR; i++)
                                        dp->dp1.di_ib[i] =
                                            inp->i_blks[UFS_NDADDR + i];
                        }
                } else {
                        dp->dp2.di_mode = iswap16(IFDIR);
                        dp->dp2.di_size = iswap64(inp->i_isize);
                        maxblk = inp->i_numblks < UFS_NDADDR ? inp->i_numblks :
                            UFS_NDADDR;
                        for (i = 0; i < maxblk; i++)
                                dp->dp2.di_db[i] = inp->i_blks[i];
                        if (inp->i_numblks > UFS_NDADDR) {
                                for (i = 0; i < UFS_NIADDR; i++)
                                        dp->dp2.di_ib[i] =
                                            inp->i_blks[UFS_NDADDR + i];
                        }
                }
                curino.id_number = inp->i_number;
                curino.id_parent = inp->i_parent;
                curino.id_uid = iswap32(DIP(dp, uid));
                curino.id_gid = iswap32(DIP(dp, gid));
                (void)ckinode(&dino, &curino);
        }

#ifndef NO_FFS_EI
        /*
         * Byte swapping in directory entries, if needed, has been done.
         * Now rescan dirs for pass2check()
         */
        if (do_dirswap) {
                do_dirswap = 0;
                for (inpp = inpsort; inpp < inpend; inpp++) {
                        inp = *inpp;
                        if (inp->i_isize == 0)
                                continue;
                        memset(&dino, 0, sizeof dino);
                        if (!is_ufs2) {
                                dino.dp1.di_mode = iswap16(IFDIR);
                                dino.dp1.di_size = iswap64(inp->i_isize);
                                for (ii = 0; ii < inp->i_numblks; ii++)
                                        dino.dp1.di_db[ii] = inp->i_blks[ii];
                        } else {
                                dino.dp2.di_mode = iswap16(IFDIR);
                                dino.dp2.di_size = iswap64(inp->i_isize);
                                for (ii = 0; ii < inp->i_numblks; ii++)
                                        dino.dp2.di_db[ii] = inp->i_blks[ii];
                        }
                        curino.id_number = inp->i_number;
                        curino.id_parent = inp->i_parent;
                        curino.id_uid = iswap32(DIP(&dino, uid));
                        curino.id_gid = iswap32(DIP(&dino, gid));
                        (void)ckinode(&dino, &curino);
                }
        }
#endif /* !NO_FFS_EI */

        /*
         * Now that the parents of all directories have been found,
         * make another pass to verify the value of `..'
         */
        for (inpp = inpsort; inpp < inpend; inpp++) {
                inp = *inpp;
                if (inp->i_parent == 0 || inp->i_isize == 0)
                        continue;
                if (inp->i_dotdot == inp->i_parent ||
                    inp->i_dotdot == (ino_t)-1)
                        continue;
                info = inoinfo(inp->i_parent);
                if (inp->i_dotdot == 0) {
                        inp->i_dotdot = inp->i_parent;
                        if (debug)
                                fileerror(inp->i_parent, inp->i_number,
                                    "DEFERRED MISSING '..' FIX");
                        (void)makeentry(inp->i_number, inp->i_parent, "..");
                        info->ino_linkcnt--;
                        continue;
                }
                fileerror(inp->i_parent, inp->i_number,
                    "BAD INODE NUMBER FOR '..'");
                if (reply("FIX") == 0) {
                        markclean = 0;
                        continue;
                }
                inoinfo(inp->i_dotdot)->ino_linkcnt++;
                info->ino_linkcnt--;
                inp->i_dotdot = inp->i_parent;
                (void)changeino(inp->i_number, "..", inp->i_parent);
        }
        /*
         * Create a list of children for each directory.
         */
        inpend = &inpsort[inplast];
        for (inpp = inpsort; inpp < inpend; inpp++) {
                inp = *inpp;
                info = inoinfo(inp->i_number);
                inp->i_child = inp->i_sibling = 0;
                if (info->ino_state == DFOUND)
                        info->ino_state = DSTATE;
        }
        for (inpp = inpsort; inpp < inpend; inpp++) {
                inp = *inpp;
                if (inp->i_parent == 0 ||
                    inp->i_number == UFS_ROOTINO)
                        continue;
                pinp = getinoinfo(inp->i_parent);
                inp->i_sibling = pinp->i_child;
                pinp->i_child = inp;
        }
        /*
         * Mark all the directories that can be found from the root.
         */
        propagate(UFS_ROOTINO);

#ifdef PROGRESS
        if (!preen)
                progress_done();
#endif /* PROGRESS */
}

static int
pass2check(struct inodesc *idesc)
{
        struct direct *dirp = idesc->id_dirp;
        struct inoinfo *inp;
        struct inostat *info;
        int n, entrysize, ret = 0;
        union dinode *dp;
        const char *errmsg;
        struct direct proto, *newdirp;
        char namebuf[MAXPATHLEN + 1];
        char pathbuf[MAXPATHLEN + 1];

        /*
         * If converting, set directory entry type.
         */
        if (!is_ufs2 && doinglevel2 && iswap32(dirp->d_ino) > 0 &&
            iswap32(dirp->d_ino) < maxino) {
                dirp->d_type = inoinfo(iswap32(dirp->d_ino))->ino_type;
                ret |= ALTERED;
        }
        /*
         * check for "."
         */
        if (idesc->id_entryno != 0)
                goto chk1;
        if (dirp->d_ino != 0 && strcmp(dirp->d_name, ".") == 0) {
                if (iswap32(dirp->d_ino) != idesc->id_number) {
                        direrror(idesc->id_number, "BAD INODE NUMBER FOR '.'");
                        if (reply("FIX") == 1) {
                                dirp->d_ino = iswap32(idesc->id_number);
                                ret |= ALTERED;
                        } else
                                markclean = 0;
                }
                if (newinofmt && dirp->d_type != DT_DIR) {
                        direrror(idesc->id_number, "BAD TYPE VALUE FOR '.'");
                        if (reply("FIX") == 1) {
                                dirp->d_type = DT_DIR;
                                ret |= ALTERED;
                        } else
                                markclean = 0;
                }
                goto chk1;
        }
        proto.d_ino = iswap32(idesc->id_number);
        if (newinofmt)
                proto.d_type = DT_DIR;
        else
                proto.d_type = 0;
        proto.d_namlen = 1;
        (void)strlcpy(proto.d_name, ".", sizeof(proto.d_name));
#       if BYTE_ORDER == LITTLE_ENDIAN
                if (!newinofmt && !needswap) {
#       else
                if (!newinofmt && needswap) {
#       endif
                        u_char tmp;

                        tmp = proto.d_type;
                        proto.d_type = proto.d_namlen;
                        proto.d_namlen = tmp;
                }
        entrysize = UFS_DIRSIZ(0, &proto, 0);
        direrror(idesc->id_number, "MISSING '.'");
        errmsg = "ADD '.' ENTRY";
        if (iswap16(dirp->d_reclen) < entrysize + UFS_DIRSIZ(0, dirp, 0)) {
                /* Not enough space to add '.', replace first entry with '.' */
                if (dirp->d_ino != 0) {
                        pwarn("\nFIRST ENTRY IN DIRECTORY CONTAINS %s\n",
                             dirp->d_name);
                        errmsg = "REPLACE WITH '.'";
                }
                if (reply(errmsg) == 0)
                        goto chk1;
                proto.d_reclen = dirp->d_reclen;
                memmove(dirp, &proto, (size_t)entrysize);
                ret |= ALTERED;
        } else {
                /* Move over first entry and add '.' entry */
                if (reply(errmsg) == 0)
                        goto chk1;
                newdirp = (struct direct *)((char *)(dirp) + entrysize);
                dirp->d_reclen = iswap16(iswap16(dirp->d_reclen) - entrysize);
                memmove(newdirp, dirp, iswap16(dirp->d_reclen));
                proto.d_reclen = iswap16(entrysize);
                memmove(dirp, &proto, (size_t)entrysize);
                idesc->id_entryno++;
                inoinfo(idesc->id_number)->ino_linkcnt--;
                dirp = newdirp;
                ret |= ALTERED;
        }
chk1:
        if (idesc->id_entryno > 1)
                goto chk2;
        inp = getinoinfo(idesc->id_number);
        proto.d_ino = iswap32(inp->i_parent);
        if (newinofmt)
                proto.d_type = DT_DIR;
        else
                proto.d_type = 0;
        proto.d_namlen = 2;
        (void)strlcpy(proto.d_name, "..", sizeof(proto.d_name));
#if BYTE_ORDER == LITTLE_ENDIAN
        if (!newinofmt && !needswap) {
#else
        if (!newinofmt && needswap) {
#endif
                u_char tmp;

                tmp = proto.d_type;
                proto.d_type = proto.d_namlen;
                proto.d_namlen = tmp;
        }
        entrysize = UFS_DIRSIZ(0, &proto, 0);
        if (idesc->id_entryno == 0) {
                n = UFS_DIRSIZ(0, dirp, 0);
                if (iswap16(dirp->d_reclen) < n + entrysize)
                        goto chk2;
                proto.d_reclen = iswap16(iswap16(dirp->d_reclen) - n);
                dirp->d_reclen = iswap16(n);
                idesc->id_entryno++;
                inoinfo(iswap32(dirp->d_ino))->ino_linkcnt--;
                dirp = (struct direct *)((char *)(dirp) + n);
                memset(dirp, 0, (size_t)iswap16(proto.d_reclen));
                dirp->d_reclen = proto.d_reclen;
        }
        if (dirp->d_ino != 0 && strcmp(dirp->d_name, "..") == 0) {
                inp->i_dotdot = iswap32(dirp->d_ino);
                if (newinofmt && dirp->d_type != DT_DIR) {
                        direrror(idesc->id_number, "BAD TYPE VALUE FOR '..'");
                        dirp->d_type = DT_DIR;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                        else
                                markclean = 0;
                }
                goto chk2;
        }
        fileerror(inp->i_parent != 0 ? inp->i_parent : idesc->id_number,
            idesc->id_number, "MISSING '..'");
        errmsg = "ADD '..' ENTRY";
        if (dirp->d_reclen < entrysize + UFS_DIRSIZ(0, dirp, 0)) {
                /* No space to add '..', replace second entry with '..' */
                if (dirp->d_ino != 0) {
                        pfatal("SECOND ENTRY IN DIRECTORY CONTAINS %s\n",
                            dirp->d_name);
                        errmsg = "REPLACE WITH '..'";
                }
                if (reply(errmsg) == 0) {
                        inp->i_dotdot = (ino_t)-1;
                        goto chk2;
                }
                if (proto.d_ino == 0) {
                        /* Defer processing until parent known */
                        idesc->id_entryno++;
                        if (debug)
                                printf("(FIX DEFERRED)\n");
                }
                inp->i_dotdot = proto.d_ino;
                proto.d_reclen = dirp->d_reclen;
                memmove(dirp, &proto, (size_t)entrysize);
                ret |= ALTERED;
        } else {
                /* Move over second entry and add '..' entry */
                if (reply(errmsg) == 0) {
                        inp->i_dotdot = (ino_t)-1;
                        goto chk2;
                }
                if (proto.d_ino == 0) {
                        /* Defer processing until parent known */
                        idesc->id_entryno++;
                        if (debug)
                                printf("(FIX DEFERRED)\n");
                }
                inp->i_dotdot = proto.d_ino;
                if (dirp->d_ino == 0) {
                        proto.d_reclen = dirp->d_reclen;
                        memmove(dirp, &proto, (size_t)entrysize);
                } else {
                        newdirp = (struct direct *)((char *)(dirp) + entrysize);
                        dirp->d_reclen -= entrysize;
                        memmove(newdirp, dirp, dirp->d_reclen);
                        proto.d_reclen = entrysize;
                        memmove(dirp, &proto, (size_t)entrysize);
                        if (dirp->d_ino != 0) {
                                idesc->id_entryno++;
                                inoinfo(dirp->d_ino)->ino_linkcnt--;
                        }
                        dirp = newdirp;
                }
                ret |= ALTERED;
        }
chk2:
        if (dirp->d_ino == 0)
                return (ret|KEEPON);
        if (dirp->d_namlen <= 2 &&
            dirp->d_name[0] == '.' &&
            idesc->id_entryno >= 2) {
                if (dirp->d_namlen == 1) {
                        direrror(idesc->id_number, "EXTRA '.' ENTRY");
                        dirp->d_ino = 0;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                        else
                                markclean = 0;
                        return (KEEPON | ret);
                }
                if (dirp->d_name[1] == '.') {
                        direrror(idesc->id_number, "EXTRA '..' ENTRY");
                        dirp->d_ino = 0;
                        if (reply("FIX") == 1)
                                ret |= ALTERED;
                        else
                                markclean = 0;
                        return (KEEPON | ret);
                }
        }
        idesc->id_entryno++;
        n = 0;
        if (iswap32(dirp->d_ino) > maxino) {
                fileerror(idesc->id_number, dirp->d_ino, "I OUT OF RANGE");
                n = reply("REMOVE");
                if (n == 0)
                        markclean = 0;
        } else if (newinofmt &&
                   ((iswap32(dirp->d_ino) == UFS_WINO && dirp->d_type != DT_WHT) ||
                    (iswap32(dirp->d_ino) != UFS_WINO && dirp->d_type == DT_WHT))) {
                fileerror(idesc->id_number, iswap32(dirp->d_ino), "BAD WHITEOUT ENTRY");
                dirp->d_ino = iswap32(UFS_WINO);
                dirp->d_type = DT_WHT;
                if (reply("FIX") == 1)
                        ret |= ALTERED;
                else
                        markclean = 0;
        } else {
again:
                info = inoinfo(iswap32(dirp->d_ino));
                switch (info->ino_state) {
                case USTATE:
                        if (idesc->id_entryno <= 2)
                                break;
                        fileerror(idesc->id_number, iswap32(dirp->d_ino), "UNALLOCATED");
                        n = reply("REMOVE");
                        if (n == 0)
                                markclean = 0;
                        break;

                case DCLEAR:
                case FCLEAR:
                        if (idesc->id_entryno <= 2)
                                break;
                        if (info->ino_state == FCLEAR)
                                errmsg = "DUP/BAD";
                        else if (!preen && !usedsoftdep)
                                errmsg = "ZERO LENGTH DIRECTORY";
                        else {
                                n = 1;
                                break;
                        }
                        fileerror(idesc->id_number, iswap32(dirp->d_ino), errmsg);
                        if ((n = reply("REMOVE")) == 1)
                                break;
                        dp = ginode(iswap32(dirp->d_ino));
                        info->ino_state =
                            (iswap16(DIP(dp, mode)) & IFMT) == IFDIR ? DSTATE : FSTATE;
                        info->ino_linkcnt = iswap16(DIP(dp, nlink));
                        goto again;

                case DSTATE:
                case DFOUND:
                        inp = getinoinfo(iswap32(dirp->d_ino));
                        if (inp->i_parent != 0 && idesc->id_entryno > 2) {
                                getpathname(pathbuf, sizeof(pathbuf),
                                    idesc->id_number, idesc->id_number);
                                getpathname(namebuf, sizeof(namebuf),
                                    iswap32(dirp->d_ino), iswap32(dirp->d_ino));
                                pwarn("%s %s %s\n", pathbuf,
                                    "IS AN EXTRANEOUS HARD LINK TO DIRECTORY",
                                    namebuf);
                                if (preen)
                                        printf(" (IGNORED)\n");
                                else if ((n = reply("REMOVE")) == 1)
                                        break;
                        }
                        if (idesc->id_entryno > 2)
                                inp->i_parent = idesc->id_number;
                        /* fall through */

                case FSTATE:
                        if (newinofmt && dirp->d_type != info->ino_type) {
                                fileerror(idesc->id_number, iswap32(dirp->d_ino),
                                    "BAD TYPE VALUE");
                                dirp->d_type = info->ino_type;
                                if (reply("FIX") == 1)
                                        ret |= ALTERED;
                                else
                                        markclean = 0;
                        }
                        info->ino_linkcnt--;
                        break;

                default:
                        errexit("BAD STATE %d FOR INODE I=%d",
                            info->ino_state, iswap32(dirp->d_ino));
                }
        }
        if (n == 0)
                return (ret|KEEPON);
        dirp->d_ino = 0;
        return (ret|KEEPON|ALTERED);
}

/*
 * Routine to sort disk blocks.
 */
static int
blksort(const void *arg1, const void *arg2)
{

        return ((*(const struct inoinfo *const *)arg1)->i_blks[0] -
                (*(const struct inoinfo *const *)arg2)->i_blks[0]);
}