sbin/dump/ffs_inode.c

   1 /*      $NetBSD: ffs_inode.c,v 1.17 2006/12/18 20:07:32 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1980, 1991, 1993, 1994
   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 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 __RCSID("$NetBSD: ffs_inode.c,v 1.17 2006/12/18 20:07:32 christos Exp $");
  40 #endif /* not lint */
  41
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/stat.h>
  45 #include <ufs/ufs/dir.h>
  46 #include <ufs/ufs/dinode.h>
  47 #include <ufs/ffs/fs.h>
  48 #include <ufs/ffs/ffs_extern.h>
  49 #include <ufs/ufs/ufs_bswap.h>
  50
  51 #include <protocols/dumprestore.h>
  52
  53 #include <ctype.h>
  54 #include <errno.h>
  55 #include <fts.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 #include "dump.h"
  62
  63 struct fs *sblock;
  64
  65 static off_t sblock_try[] = SBLOCKSEARCH;
  66 off_t sblockloc;
  67
  68 int is_ufs2;
  69
  70 /*
  71  * Read the superblock from disk, and check its magic number.
  72  * Determine whether byte-swapping needs to be done on this file system.
  73  */
  74 int
  75 fs_read_sblock(char *superblock)
  76 {
  77         int i;
  78         int ns = 0;
  79
  80         sblock = (struct fs *)superblock;
  81         for (i = 0; ; i++) {
  82                 if (sblock_try[i] == -1)
  83                         quit("can't find superblock\n");
  84                 rawread(sblock_try[i], (char *)superblock, MAXBSIZE);
  85
  86                 switch(sblock->fs_magic) {
  87                 case FS_UFS2_MAGIC:
  88                         is_ufs2 = 1;
  89                         /*FALLTHROUGH*/
  90                 case FS_UFS1_MAGIC:
  91                         break;
  92                 case FS_UFS2_MAGIC_SWAPPED:
  93                         is_ufs2 = 1;
  94                         /*FALLTHROUGH*/
  95                 case FS_UFS1_MAGIC_SWAPPED:
  96                         ns = 1;
  97                         ffs_sb_swap(sblock, sblock);
  98                         break;
  99                 default:
 100                         continue;
 101                 }
 102                 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2)
 103                         continue;
 104                 if ((is_ufs2 || sblock->fs_old_flags & FS_FLAGS_UPDATED)
 105                     && sblock_try[i] != sblock->fs_sblockloc)
 106                         continue;
 107                 break;
 108         }
 109         return ns;
 110 }
 111
 112 /*
 113  * Fill in the ufsi struct, as well as the maxino and dev_bsize global
 114  * variables.
 115  */
 116 struct ufsi *
 117 fs_parametrize(void)
 118 {
 119         static struct ufsi ufsi;
 120
 121 #ifdef FS_44INODEFMT
 122         if (is_ufs2 || sblock->fs_old_inodefmt >= FS_44INODEFMT) {
 123                 spcl.c_flags = iswap32(iswap32(spcl.c_flags) | DR_NEWINODEFMT);
 124         } else {
 125                 /*
 126                  * Determine parameters for older file systems. From
 127                  *      /sys/ufs/ffs/ffs_vfsops.c::ffs_oldfscompat()
 128                  *
 129                  * XXX: not sure if other variables (fs_npsect, fs_interleave,
 130                  * fs_nrpos, fs_maxfilesize) need to be fudged too.
 131                  */
 132                 sblock->fs_qbmask = ~sblock->fs_bmask;
 133                 sblock->fs_qfmask = ~sblock->fs_fmask;
 134         }
 135 #endif
 136
 137         /* Fill out ufsi struct */
 138         ufsi.ufs_dsize = fsbtodb(sblock,sblock->fs_size);
 139         ufsi.ufs_bsize = sblock->fs_bsize;
 140         ufsi.ufs_bshift = sblock->fs_bshift;
 141         ufsi.ufs_fsize = sblock->fs_fsize;
 142         ufsi.ufs_frag = sblock->fs_frag;
 143         ufsi.ufs_fsatoda = sblock->fs_fsbtodb;
 144         ufsi.ufs_nindir = sblock->fs_nindir;
 145         ufsi.ufs_inopb = sblock->fs_inopb;
 146         ufsi.ufs_maxsymlinklen = sblock->fs_maxsymlinklen;
 147         ufsi.ufs_bmask = sblock->fs_bmask;
 148         ufsi.ufs_fmask = sblock->fs_fmask;
 149         ufsi.ufs_qbmask = sblock->fs_qbmask;
 150         ufsi.ufs_qfmask = sblock->fs_qfmask;
 151
 152         dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1);
 153
 154         return &ufsi;
 155 }
 156
 157 ino_t
 158 fs_maxino(void)
 159 {
 160
 161         return sblock->fs_ipg * sblock->fs_ncg;
 162 }
 163
 164 void
 165 fs_mapinodes(ino_t maxino __unused, u_int64_t *tape_size, int *anydirskipped)
 166 {
 167         int i, cg, inosused;
 168         struct cg *cgp;
 169         ino_t ino;
 170         char *cp;
 171
 172         if ((cgp = malloc(sblock->fs_cgsize)) == NULL)
 173                 quit("fs_mapinodes: cannot allocate memory.\n");
 174
 175         for (cg = 0; cg < sblock->fs_ncg; cg++) {
 176                 ino = cg * sblock->fs_ipg;
 177                 bread(fsbtodb(sblock, cgtod(sblock, cg)), (char *)cgp,
 178                     sblock->fs_cgsize);
 179                 if (needswap)
 180                         ffs_cg_swap(cgp, cgp, sblock);
 181                 if (sblock->fs_magic == FS_UFS2_MAGIC)
 182                         inosused = cgp->cg_initediblk;
 183                 else
 184                         inosused = sblock->fs_ipg;
 185                 /*
 186                  * If we are using soft updates, then we can trust the
 187                  * cylinder group inode allocation maps to tell us which
 188                  * inodes are allocated. We will scan the used inode map
 189                  * to find the inodes that are really in use, and then
 190                  * read only those inodes in from disk.
 191                  */
 192                 if (sblock->fs_flags & FS_DOSOFTDEP) {
 193                         if (!cg_chkmagic(cgp, 0))
 194                                 quit("mapfiles: cg %d: bad magic number\n", cg);
 195                         cp = &cg_inosused(cgp, 0)[(inosused - 1) / CHAR_BIT];
 196                         for ( ; inosused > 0; inosused -= CHAR_BIT, cp--) {
 197                                 if (*cp == 0)
 198                                         continue;
 199                                 for (i = 1 << (CHAR_BIT - 1); i > 0; i >>= 1) {
 200                                         if (*cp & i)
 201                                                 break;
 202                                         inosused--;
 203                                 }
 204                                 break;
 205                         }
 206                         if (inosused <= 0)
 207                                 continue;
 208                 }
 209                 for (i = 0; i < inosused; i++, ino++) {
 210                         if (ino < ROOTINO)
 211                                 continue;
 212                         mapfileino(ino, tape_size, anydirskipped);
 213                 }
 214         }
 215
 216         free(cgp);
 217 }
 218
 219 union dinode *
 220 getino(ino_t inum)
 221 {
 222         static ino_t minino, maxino;
 223         static caddr_t inoblock;
 224         int ntoswap, i;
 225         struct ufs1_dinode *dp1;
 226         struct ufs2_dinode *dp2;
 227
 228         if (inoblock == NULL && (inoblock = malloc(ufsib->ufs_bsize)) == NULL)
 229                 quit("cannot allocate inode memory.\n");
 230         curino = inum;
 231         if (inum >= minino && inum < maxino)
 232                 goto gotit;
 233         bread(fsatoda(ufsib, ino_to_fsba(sblock, inum)), (char *)inoblock,
 234             (int)ufsib->ufs_bsize);
 235         minino = inum - (inum % INOPB(sblock));
 236         maxino = minino + INOPB(sblock);
 237         if (needswap) {
 238                 if (is_ufs2) {
 239                         dp2 = (struct ufs2_dinode *)inoblock;
 240                         ntoswap = ufsib->ufs_bsize / sizeof(struct ufs2_dinode);
 241                         for (i = 0; i < ntoswap; i++)
 242                                 ffs_dinode2_swap(&dp2[i], &dp2[i]);
 243                 } else {
 244                         dp1 = (struct ufs1_dinode *)inoblock;
 245                         ntoswap = ufsib->ufs_bsize / sizeof(struct ufs1_dinode);
 246                         for (i = 0; i < ntoswap; i++)
 247                                 ffs_dinode1_swap(&dp1[i], &dp1[i]);
 248                 }
 249         }
 250 gotit:
 251         if (is_ufs2) {
 252                 dp2 = &((struct ufs2_dinode *)inoblock)[inum - minino];
 253                 return (union dinode *)dp2;
 254         }
 255         dp1 = &((struct ufs1_dinode *)inoblock)[inum - minino];
 256         return ((union dinode *)dp1);
 257 }