debugfs/ncheck.c

   1 /*
   2  * ncheck.c --- given a list of inodes, generate a list of names
   3  *
   4  * Copyright (C) 1994 Theodore Ts'o.  This file may be redistributed
   5  * under the terms of the GNU Public License.
   6  */
   7
   8 #include <stdio.h>
   9 #include <unistd.h>
  10 #include <stdlib.h>
  11 #include <ctype.h>
  12 #include <string.h>
  13 #include <time.h>
  14 #ifdef HAVE_ERRNO_H
  15 #include <errno.h>
  16 #endif
  17 #include <sys/types.h>
  18
  19 #include "debugfs.h"
  20
  21 struct inode_info {
  22         ino_t   ino;
  23         ino_t   parent;
  24         char    *pathname;
  25 };
  26
  27 struct inode_walk_struct {
  28         struct inode_info       *iarray;
  29         int                     inodes_left;
  30         int                     num_inodes;
  31         int                     position;
  32         ino_t                   parent;
  33 };
  34
  35 static int ncheck_proc(struct ext2_dir_entry *dirent,
  36                        int      offset,
  37                        int      blocksize,
  38                        char     *buf,
  39                        void     *private)
  40 {
  41         struct inode_walk_struct *iw = (struct inode_walk_struct *) private;
  42         int     i;
  43
  44         iw->position++;
  45         if (iw->position <= 2)
  46                 return 0;
  47         for (i=0; i < iw->num_inodes; i++) {
  48                 if (iw->iarray[i].ino == dirent->inode) {
  49                         iw->iarray[i].parent = iw->parent;
  50                         iw->inodes_left--;
  51                 }
  52         }
  53         if (!iw->inodes_left)
  54                 return DIRENT_ABORT;
  55
  56         return 0;
  57 }
  58
  59 void do_ncheck(int argc, char **argv)
  60 {
  61         struct inode_walk_struct iw;
  62         struct inode_info       *iinfo;
  63         int                     i;
  64         ext2_inode_scan         scan = 0;
  65         ino_t                   ino;
  66         struct ext2_inode       inode;
  67         errcode_t               retval;
  68         char                    *tmp;
  69
  70         if (argc < 2) {
  71                 com_err(argv[0], 0, "Usage: ncheck <inode number> ...");
  72                 return;
  73         }
  74         if (check_fs_open(argv[0]))
  75                 return;
  76
  77         iw.iarray = malloc(sizeof(struct inode_info) * argc);
  78         if (!iw.iarray) {
  79                 com_err("do_ncheck", ENOMEM,
  80                         "while allocating inode info array");
  81                 return;
  82         }
  83         memset(iw.iarray, 0, sizeof(struct inode_info) * argc);
  84
  85         for (i=1; i < argc; i++) {
  86                 iw.iarray[i-1].ino = strtol(argv[i], &tmp, 0);
  87                 if (*tmp) {
  88                         com_err(argv[0], 0, "Bad inode - %s", argv[i]);
  89                         return;
  90                 }
  91         }
  92
  93         iw.num_inodes = iw.inodes_left = argc-1;
  94
  95         retval = ext2fs_open_inode_scan(current_fs, 0, &scan);
  96         if (retval) {
  97                 com_err("ncheck", retval, "while opening inode scan");
  98                 goto error_out;
  99         }
 100
 101         retval = ext2fs_get_next_inode(scan, &ino, &inode);
 102         if (retval) {
 103                 com_err("ncheck", retval, "while starting inode scan");
 104                 goto error_out;
 105         }
 106
 107         while (ino) {
 108                 if (!inode.i_links_count)
 109                         goto next;
 110                 /*
 111                  * To handle filesystems touched by 0.3c extfs; can be
 112                  * removed later.
 113                  */
 114                 if (inode.i_dtime)
 115                         goto next;
 116                 /* Ignore anything that isn't a directory */
 117                 if (!LINUX_S_ISDIR(inode.i_mode))
 118                         goto next;
 119
 120                 iw.position = 0;
 121                 iw.parent = ino;
 122
 123                 retval = ext2fs_dir_iterate(current_fs, ino, 0, 0,
 124                                             ncheck_proc, &iw);
 125                 if (retval) {
 126                         com_err("ncheck", retval,
 127                                 "while calling ext2_dir_iterate");
 128                         goto next;
 129                 }
 130
 131                 if (iw.inodes_left == 0)
 132                         break;
 133
 134         next:
 135                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
 136                 if (retval) {
 137                         com_err("ncheck", retval,
 138                                 "while doing inode scan");
 139                         goto error_out;
 140                 }
 141         }
 142
 143         for (i=0, iinfo = iw.iarray; i < iw.num_inodes; i++, iinfo++) {
 144                 if (iinfo->parent == 0)
 145                         continue;
 146                 retval = ext2fs_get_pathname(current_fs, iinfo->parent,
 147                                              iinfo->ino, &iinfo->pathname);
 148                 if (retval)
 149                         com_err("ncheck", retval,
 150                                 "while resolving pathname for inode %d (%d)",
 151                                 iinfo->parent, iinfo->ino);
 152         }
 153
 154         printf("Inode\tPathname\n");
 155         for (i=0, iinfo = iw.iarray; i < iw.num_inodes; i++, iinfo++) {
 156                 if (iinfo->parent == 0) {
 157                         printf("%ld\t<inode not found>\n", iinfo->ino);
 158                         continue;
 159                 }
 160                 printf("%ld\t%s\n", iinfo->ino, iinfo->pathname ?
 161                        iinfo->pathname : "<unknown pathname>");
 162                 if (iinfo->pathname)
 163                         free(iinfo->pathname);
 164         }
 165
 166 error_out:
 167         free(iw.iarray);
 168         if (scan)
 169                 ext2fs_close_inode_scan(scan);
 170         return;
 171 }
 172
 173
 174