sbin/fsck_ext2fs/pass4.c

   1 /*      $NetBSD: pass4.c,v 1.10 2009/10/19 18:41:08 bouyer Exp $        */
   2
   3 /*
   4  * Copyright (c) 1980, 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 1997 Manuel Bouyer.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  45  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  47  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  48  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  49  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  53  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #include <sys/cdefs.h>
  57 #ifndef lint
  58 #if 0
  59 static char sccsid[] = "@(#)pass4.c     8.1 (Berkeley) 6/5/93";
  60 #else
  61 __RCSID("$NetBSD: pass4.c,v 1.10 2009/10/19 18:41:08 bouyer Exp $");
  62 #endif
  63 #endif /* not lint */
  64
  65 #include <sys/param.h>
  66 #include <sys/time.h>
  67 #include <ufs/ext2fs/ext2fs_dinode.h>
  68 #include <ufs/ext2fs/ext2fs.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71
  72 #include "fsutil.h"
  73 #include "fsck.h"
  74 #include "extern.h"
  75
  76 void
  77 pass4(void)
  78 {
  79         ino_t inumber;
  80         struct zlncnt *zlnp;
  81         struct ext2fs_dinode *dp;
  82         struct inodesc idesc;
  83         int n;
  84
  85         memset(&idesc, 0, sizeof(struct inodesc));
  86         idesc.id_type = ADDR;
  87         idesc.id_func = pass4check;
  88         for (inumber = EXT2_ROOTINO; inumber <= lastino; inumber++) {
  89                 if (inumber < EXT2_FIRSTINO && inumber > EXT2_ROOTINO)
  90                         continue;
  91                 idesc.id_number = inumber;
  92                 switch (statemap[inumber]) {
  93
  94                 case FSTATE:
  95                 case DFOUND:
  96                         n = lncntp[inumber];
  97                         if (n)
  98                                 adjust(&idesc, (short)n);
  99                         else {
 100                                 for (zlnp = zlnhead; zlnp; zlnp = zlnp->next)
 101                                         if (zlnp->zlncnt == inumber) {
 102                                                 zlnp->zlncnt = zlnhead->zlncnt;
 103                                                 zlnp = zlnhead;
 104                                                 zlnhead = zlnhead->next;
 105                                                 free((char *)zlnp);
 106                                                 clri(&idesc, "UNREF", 1);
 107                                                 break;
 108                                         }
 109                         }
 110                         break;
 111
 112                 case DSTATE:
 113                         clri(&idesc, "UNREF", 1);
 114                         break;
 115
 116                 case DCLEAR:
 117                         dp = ginode(inumber);
 118                         if (inosize(dp) == 0) {
 119                                 clri(&idesc, "ZERO LENGTH", 1);
 120                                 break;
 121                         }
 122                         /* fall through */
 123                 case FCLEAR:
 124                         clri(&idesc, "BAD/DUP", 1);
 125                         break;
 126
 127                 case USTATE:
 128                         break;
 129
 130                 default:
 131                         errexit("BAD STATE %d FOR INODE I=%llu",
 132                             statemap[inumber], (unsigned long long)inumber);
 133                 }
 134         }
 135 }
 136
 137 int
 138 pass4check(struct inodesc *idesc)
 139 {
 140         struct dups *dlp;
 141         int nfrags, res = KEEPON;
 142         daddr_t blkno = idesc->id_blkno;
 143
 144         for (nfrags = idesc->id_numfrags; nfrags > 0; blkno++, nfrags--) {
 145                 if (chkrange(blkno, 1)) {
 146                         res = SKIP;
 147                 } else if (testbmap(blkno)) {
 148                         for (dlp = duplist; dlp; dlp = dlp->next) {
 149                                 if (dlp->dup != blkno)
 150                                         continue;
 151                                 dlp->dup = duplist->dup;
 152                                 dlp = duplist;
 153                                 duplist = duplist->next;
 154                                 free((char *)dlp);
 155                                 break;
 156                         }
 157                         if (dlp == 0) {
 158                                 clrbmap(blkno);
 159                                 n_blks--;
 160                         }
 161                 }
 162         }
 163         return (res);
 164 }