debugfs/lsdel.c

   1 /*
   2  * lsdel.c --- routines to try to help a user recover a deleted file.
   3  *
   4  * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
   5  * Theodore Ts'o.  This file may be redistributed under the terms of
   6  * the GNU Public License.
   7  */
   8
   9 #include "config.h"
  10 #include <stdio.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <ctype.h>
  14 #include <string.h>
  15 #include <time.h>
  16 #ifdef HAVE_ERRNO_H
  17 #include <errno.h>
  18 #endif
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21
  22 #include "debugfs.h"
  23
  24 struct deleted_info {
  25         ext2_ino_t      ino;
  26         unsigned short  mode;
  27         __u32           uid;
  28         __u64           size;
  29         time_t          dtime;
  30         e2_blkcnt_t     num_blocks;
  31         e2_blkcnt_t     free_blocks;
  32 };
  33
  34 struct lsdel_struct {
  35         ext2_ino_t              inode;
  36         e2_blkcnt_t             num_blocks;
  37         e2_blkcnt_t             free_blocks;
  38         e2_blkcnt_t             bad_blocks;
  39 };
  40
  41 static int deleted_info_compare(const void *a, const void *b)
  42 {
  43         const struct deleted_info *arg1, *arg2;
  44
  45         arg1 = (const struct deleted_info *) a;
  46         arg2 = (const struct deleted_info *) b;
  47
  48         return arg1->dtime - arg2->dtime;
  49 }
  50
  51 static int lsdel_proc(ext2_filsys fs,
  52                       blk64_t   *block_nr,
  53                       e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
  54                       blk64_t ref_block EXT2FS_ATTR((unused)),
  55                       int ref_offset EXT2FS_ATTR((unused)),
  56                       void *private)
  57 {
  58         struct lsdel_struct *lsd = (struct lsdel_struct *) private;
  59
  60         lsd->num_blocks++;
  61
  62         if (*block_nr < fs->super->s_first_data_block ||
  63             *block_nr >= ext2fs_blocks_count(fs->super)) {
  64                 lsd->bad_blocks++;
  65                 return BLOCK_ABORT;
  66         }
  67
  68         if (!ext2fs_test_block_bitmap2(fs->block_map,*block_nr))
  69                 lsd->free_blocks++;
  70
  71         return 0;
  72 }
  73
  74 void do_lsdel(int argc, char **argv)
  75 {
  76         struct lsdel_struct     lsd;
  77         struct deleted_info     *delarray;
  78         int                     num_delarray, max_delarray;
  79         ext2_inode_scan         scan = 0;
  80         ext2_ino_t              ino;
  81         struct ext2_inode       inode;
  82         errcode_t               retval;
  83         char                    *block_buf;
  84         int                     i;
  85         long                    secs = 0;
  86         char                    *tmp;
  87         time_t                  now;
  88         FILE                    *out;
  89
  90         if (common_args_process(argc, argv, 1, 2, "list_deleted_inodes",
  91                                 "[secs]", 0))
  92                 return;
  93
  94         if (argc > 1) {
  95                 secs = strtol(argv[1],&tmp,0);
  96                 if (*tmp) {
  97                         com_err(argv[0], 0, "Bad time - %s",argv[1]);
  98                         return;
  99                 }
 100         }
 101
 102         now = current_fs->now ? current_fs->now : time(0);
 103         max_delarray = 100;
 104         num_delarray = 0;
 105         delarray = malloc(max_delarray * sizeof(struct deleted_info));
 106         if (!delarray) {
 107                 com_err("ls_deleted_inodes", ENOMEM,
 108                         "while allocating deleted information storage");
 109                 exit(1);
 110         }
 111
 112         block_buf = malloc(current_fs->blocksize * 3);
 113         if (!block_buf) {
 114                 com_err("ls_deleted_inodes", ENOMEM, "while allocating block buffer");
 115                 goto error_out;
 116         }
 117
 118         retval = ext2fs_open_inode_scan(current_fs, 0, &scan);
 119         if (retval) {
 120                 com_err("ls_deleted_inodes", retval,
 121                         "while opening inode scan");
 122                 goto error_out;
 123         }
 124
 125         do {
 126                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
 127         } while (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE);
 128         if (retval) {
 129                 com_err("ls_deleted_inodes", retval,
 130                         "while starting inode scan");
 131                 goto error_out;
 132         }
 133
 134         while (ino) {
 135                 if ((inode.i_dtime == 0) ||
 136                     (secs && ((unsigned) abs(now - secs) > inode.i_dtime)))
 137                         goto next;
 138
 139                 lsd.inode = ino;
 140                 lsd.num_blocks = 0;
 141                 lsd.free_blocks = 0;
 142                 lsd.bad_blocks = 0;
 143
 144                 if (ext2fs_inode_has_valid_blocks2(current_fs, &inode)) {
 145                         retval = ext2fs_block_iterate3(current_fs, ino,
 146                                                        BLOCK_FLAG_READ_ONLY,
 147                                                        block_buf,
 148                                                        lsdel_proc, &lsd);
 149                         if (retval) {
 150                                 com_err("ls_deleted_inodes", retval,
 151                                         "while calling ext2fs_block_iterate2");
 152                                 goto next;
 153                         }
 154                 }
 155                 if ((lsd.free_blocks && !lsd.bad_blocks) ||
 156                     inode.i_flags & EXT4_INLINE_DATA_FL) {
 157                         if (num_delarray >= max_delarray) {
 158                                 max_delarray += 50;
 159                                 delarray = realloc(delarray,
 160                            max_delarray * sizeof(struct deleted_info));
 161                                 if (!delarray) {
 162                                         com_err("ls_deleted_inodes",
 163                                                 ENOMEM,
 164                                                 "while reallocating array");
 165                                         exit(1);
 166                                 }
 167                         }
 168
 169                         delarray[num_delarray].ino = ino;
 170                         delarray[num_delarray].mode = inode.i_mode;
 171                         delarray[num_delarray].uid = inode_uid(inode);
 172                         delarray[num_delarray].size = EXT2_I_SIZE(&inode);
 173                         delarray[num_delarray].dtime = inode.i_dtime;
 174                         delarray[num_delarray].num_blocks = lsd.num_blocks;
 175                         delarray[num_delarray].free_blocks = lsd.free_blocks;
 176                         num_delarray++;
 177                 }
 178
 179         next:
 180                 do {
 181                         retval = ext2fs_get_next_inode(scan, &ino, &inode);
 182                 } while (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE);
 183                 if (retval) {
 184                         com_err("ls_deleted_inodes", retval,
 185                                 "while doing inode scan");
 186                         goto error_out;
 187                 }
 188         }
 189
 190         out = open_pager();
 191
 192         fprintf(out, " Inode  Owner  Mode    Size      Blocks   Time deleted\n");
 193
 194         qsort(delarray, num_delarray, sizeof(struct deleted_info),
 195               deleted_info_compare);
 196
 197         for (i = 0; i < num_delarray; i++) {
 198                 fprintf(out, "%6u %6d %6o %6llu %6lld/%6lld %s",
 199                         delarray[i].ino,
 200                         delarray[i].uid, delarray[i].mode, delarray[i].size,
 201                         delarray[i].free_blocks, delarray[i].num_blocks,
 202                         time_to_string(delarray[i].dtime));
 203         }
 204         fprintf(out, "%d deleted inodes found.\n", num_delarray);
 205         close_pager(out);
 206
 207 error_out:
 208         free(block_buf);
 209         free(delarray);
 210         if (scan)
 211                 ext2fs_close_inode_scan(scan);
 212         return;
 213 }
 214
 215
 216