sbin/clri/clri.c

   1 /*      $NetBSD: clri.c,v 1.20 2008/07/20 01:20:21 lukem Exp $  */
   2
   3 /*
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Rich $alz of BBN Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __COPYRIGHT("@(#) Copyright (c) 1990, 1993\
  38  The Regents of the University of California.  All rights reserved.");
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)clri.c      8.3 (Berkeley) 4/28/95";
  44 #else
  45 __RCSID("$NetBSD: clri.c,v 1.20 2008/07/20 01:20:21 lukem Exp $");
  46 #endif
  47 #endif /* not lint */
  48
  49 #include <sys/param.h>
  50 #include <sys/time.h>
  51
  52 #include <ufs/ufs/dinode.h>
  53 #include <ufs/ufs/ufs_bswap.h>
  54 #include <ufs/ffs/fs.h>
  55 #include <ufs/ffs/ffs_extern.h>
  56
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <fcntl.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <stdio.h>
  63 #include <unistd.h>
  64
  65 /*
  66  * Possible superblock locations ordered from most to least likely.
  67  */
  68 static off_t sblock_try[] = SBLOCKSEARCH;
  69 off_t sblockloc;
  70
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         struct fs *sbp;
  76         struct ufs1_dinode *ip1;
  77         struct ufs2_dinode *ip2;
  78         int fd;
  79         char *ibuf[MAXBSIZE];
  80         int32_t generation;
  81         off_t offset;
  82         size_t bsize;
  83         int inonum;
  84         char *fs, sblock[SBLOCKSIZE];
  85         int needswap = 0, is_ufs2 = 0;
  86         int i, imax;
  87
  88         if (argc < 3) {
  89                 (void)fprintf(stderr, "usage: clri filesystem inode ...\n");
  90                 exit(1);
  91         }
  92
  93         fs = *++argv;
  94
  95
  96         /* get the superblock. */
  97         if ((fd = open(fs, O_RDWR, 0)) < 0)
  98                 err(1, "%s", fs);
  99         for (i = 0;; i++) {
 100                 sblockloc = sblock_try[i];
 101                 if (sblockloc == -1)
 102                         errx(1, "%s: can't find superblock", fs);
 103                 if (pread(fd, sblock, sizeof(sblock), sblockloc) != sizeof(sblock))
 104                         errx(1, "%s: can't read superblock", fs);
 105
 106                 sbp = (struct fs *)sblock;
 107                 switch(sbp->fs_magic) {
 108                 case FS_UFS2_MAGIC:
 109                         is_ufs2 = 1;
 110                         /*FALLTHROUGH*/
 111                 case FS_UFS1_MAGIC:
 112                         break;
 113                 case FS_UFS2_MAGIC_SWAPPED:
 114                         is_ufs2 = 1;
 115                         /*FALLTHROUGH*/
 116                 case FS_UFS1_MAGIC_SWAPPED:
 117                         needswap = 1;
 118                         break;
 119                 default:
 120                         continue;
 121                 }
 122
 123                 /* check we haven't found an alternate */
 124                 if (is_ufs2 || sbp->fs_old_flags & FS_FLAGS_UPDATED) {
 125                         if ((uint64_t)sblockloc != ufs_rw64(sbp->fs_sblockloc, needswap))
 126                                 continue;
 127                 } else {
 128                         if (sblockloc == SBLOCK_UFS2)
 129                                 continue;
 130                 }
 131
 132                 break;
 133         }
 134
 135         /* check that inode numbers are valid */
 136         imax = ufs_rw32(sbp->fs_ncg, needswap) *
 137                 ufs_rw32(sbp->fs_ipg, needswap);
 138         for (i = 1; i < (argc - 1); i++)
 139                 if (atoi(argv[i]) <= 0 || atoi(argv[i]) >= imax)
 140                         errx(1, "%s is not a valid inode number", argv[i]);
 141
 142         /* delete clean flag in the superblok */
 143         sbp->fs_clean = ufs_rw32(ufs_rw32(sbp->fs_clean, needswap) << 1,
 144                                 needswap);
 145         if (lseek(fd, sblockloc, SEEK_SET) < 0)
 146                 err(1, "%s", fs);
 147         if (write(fd, sblock, sizeof(sblock)) != sizeof(sblock))
 148                 errx(1, "%s: can't rewrite superblock", fs);
 149         (void)fsync(fd);
 150
 151         if (needswap)
 152                 ffs_sb_swap(sbp, sbp);
 153         bsize = sbp->fs_bsize;
 154
 155         /* remaining arguments are inode numbers. */
 156         while (*++argv) {
 157                 /* get the inode number. */
 158                 inonum = atoi(*argv);
 159                 (void)printf("clearing %d\n", inonum);
 160
 161                 /* read in the appropriate block. */
 162                 offset = ino_to_fsba(sbp, inonum);      /* inode to fs blk */
 163                 offset = fsbtodb(sbp, offset);          /* fs blk disk blk */
 164                 offset *= DEV_BSIZE;                    /* disk blk to bytes */
 165
 166                 /* seek and read the block */
 167                 if (lseek(fd, offset, SEEK_SET) < 0)
 168                         err(1, "%s", fs);
 169                 if ((size_t)read(fd, ibuf, bsize) != bsize)
 170                         err(1, "%s", fs);
 171
 172                 /* get the inode within the block. */
 173                 if (is_ufs2) {
 174                         ip2 = &((struct ufs2_dinode *)ibuf)
 175                             [ino_to_fsbo(sbp, inonum)];
 176                         /* clear the inode, and bump the generation count. */
 177                         generation = ip2->di_gen + 1;
 178                         memset(ip2, 0, sizeof(*ip2));
 179                         ip2->di_gen = generation;
 180                 } else {
 181                         ip1 = &((struct ufs1_dinode *)ibuf)
 182                             [ino_to_fsbo(sbp, inonum)];
 183                         /* clear the inode, and bump the generation count. */
 184                         generation = ip1->di_gen + 1;
 185                         memset(ip1, 0, sizeof(*ip1));
 186                         ip1->di_gen = generation;
 187                 }
 188
 189                 /* backup and write the block */
 190                 if (lseek(fd, offset, SEEK_SET) < 0)
 191                         err(1, "%s", fs);
 192                 if ((size_t)write(fd, ibuf, bsize) != bsize)
 193                         err(1, "%s", fs);
 194                 (void)fsync(fd);
 195         }
 196         (void)close(fd);
 197         exit(0);
 198 }