/*
 * 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.
 *
 * @(#)pass4.c  8.4 (Berkeley) 4/28/95
 * $FreeBSD: src/sbin/fsck/pass4.c,v 1.7.2.1 2001/01/23 23:11:07 iedowse Exp $
 */

#include <sys/param.h>

#include <vfs/ufs/dinode.h>
#include <vfs/ufs/fs.h>

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

#include "fsck.h"

struct dups *duplist;           /* head of dup list */
struct zlncnt *zlnhead;         /* head of zero link count list */

void
pass4(void)
{
        ufs1_ino_t inumber;
        struct zlncnt *zlnp;
        struct ufs1_dinode *dp;
        struct inodesc idesc;
        int i, n, cg;

        memset(&idesc, 0, sizeof(struct inodesc));
        idesc.id_type = ADDR;
        idesc.id_func = pass4check;
        for (cg = 0; cg < sblock.fs_ncg; cg++) {
                if (got_siginfo) {
                        printf("%s: phase 4: cyl group %d of %d (%d%%)\n",
                            cdevname, cg, sblock.fs_ncg,
                            cg * 100 / sblock.fs_ncg);
                        got_siginfo = 0;
                }
                inumber = cg * sblock.fs_ipg;
                for (i = 0; i < inostathead[cg].il_numalloced; i++, inumber++) {
                        if (inumber < UFS_ROOTINO)
                                continue;
                        idesc.id_number = inumber;
                        switch (inoinfo(inumber)->ino_state) {

                        case FSTATE:
                        case DFOUND:
                                n = inoinfo(inumber)->ino_linkcnt;
                                if (n) {
                                        adjust(&idesc, (short)n);
                                        break;
                                }
                                for (zlnp = zlnhead; zlnp; zlnp = zlnp->next) {
                                        if (zlnp->zlncnt == inumber) {
                                                zlnp->zlncnt = zlnhead->zlncnt;
                                                zlnp = zlnhead;
                                                zlnhead = zlnhead->next;
                                                free((char *)zlnp);
                                                clri(&idesc, "UNREF", 1);
                                                break;
                                        }
                                }
                                break;

                        case DSTATE:
                                clri(&idesc, "UNREF", 1);
                                break;

                        case DCLEAR:
                                dp = ginode(inumber);
                                if (dp->di_size == 0) {
                                        clri(&idesc, "ZERO LENGTH", 1);
                                        break;
                                }
                                /* fall through */
                        case FCLEAR:
                                clri(&idesc, "BAD/DUP", 1);
                                break;

                        case USTATE:
                                break;

                        default:
                                errx(EEXIT, "BAD STATE %d FOR INODE I=%d",
                                    inoinfo(inumber)->ino_state, inumber);
                        }
                }
        }
}

int
pass4check(struct inodesc *idesc)
{
        struct dups *dlp;
        int nfrags, res = KEEPON;
        ufs_daddr_t blkno = idesc->id_blkno;

        for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
                if (chkrange(blkno, 1)) {
                        res = SKIP;
                } else if (testbmap(blkno)) {
                        for (dlp = duplist; dlp; dlp = dlp->next) {
                                if (dlp->dup != blkno)
                                        continue;
                                dlp->dup = duplist->dup;
                                dlp = duplist;
                                duplist = duplist->next;
                                free((char *)dlp);
                                break;
                        }
                        if (dlp == NULL) {
                                clrbmap(blkno);
                                n_blks--;
                        }
                }
        }
        return (res);
}