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 <stdio.h>
  10 #include <unistd.h>
  11 #include <stdlib.h>
  12 #include <ctype.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #ifdef HAVE_ERRNO_H
  16 #include <errno.h>
  17 #endif
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20
  21 #include "debugfs.h"
  22
  23 struct deleted_info {
  24         ext2_ino_t      ino;
  25         unsigned short  mode;
  26         __u32           uid;
  27         __u64           size;
  28         time_t          dtime;
  29         e2_blkcnt_t     num_blocks;
  30         e2_blkcnt_t     free_blocks;
  31 };
  32
  33 struct lsdel_struct {
  34         ext2_ino_t              inode;
  35         e2_blkcnt_t             num_blocks;
  36         e2_blkcnt_t             free_blocks;
  37         e2_blkcnt_t             bad_blocks;
  38 };
  39
  40 static int deleted_info_compare(const void *a, const void *b)
  41 {
  42         const struct deleted_info *arg1, *arg2;
  43
  44         arg1 = (const struct deleted_info *) a;
  45         arg2 = (const struct deleted_info *) b;
  46
  47         return arg1->dtime - arg2->dtime;
  48 }
  49
  50 static int lsdel_proc(ext2_filsys fs,
  51                       blk_t     *block_nr,
  52                       e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
  53                       blk_t ref_block EXT2FS_ATTR((unused)),
  54                       int ref_offset EXT2FS_ATTR((unused)),
  55                       void *private)
  56 {
  57         struct lsdel_struct *lsd = (struct lsdel_struct *) private;
  58
  59         lsd->num_blocks++;
  60
  61         if (*block_nr < fs->super->s_first_data_block ||
  62             *block_nr >= fs->super->s_blocks_count) {
  63                 lsd->bad_blocks++;
  64                 return BLOCK_ABORT;
  65         }
  66
  67         if (!ext2fs_test_block_bitmap(fs->block_map,*block_nr))
  68                 lsd->free_blocks++;
  69
  70         return 0;
  71 }
  72
  73 void do_lsdel(int argc, char **argv)
  74 {
  75         struct lsdel_struct     lsd;
  76         struct deleted_info     *delarray;
  77         int                     num_delarray, max_delarray;
  78         ext2_inode_scan         scan = 0;
  79         ext2_ino_t              ino;
  80         struct ext2_inode       inode;
  81         errcode_t               retval;
  82         char                    *block_buf;
  83         int                     i;
  84         long                    secs = 0;
  85         char                    *tmp;
  86         time_t                  now;
  87         FILE                    *out;
  88
  89         if (common_args_process(argc, argv, 1, 2, "ls_deleted_inodes",
  90                                 "[secs]", 0))
  91                 return;
  92
  93         if (argc > 1) {
  94                 secs = strtol(argv[1],&tmp,0);
  95                 if (*tmp) {
  96                         com_err(argv[0], 0, "Bad time - %s",argv[1]);
  97                         return;
  98                 }
  99         }
 100
 101         now = current_fs->now ? current_fs->now : time(0);
 102         max_delarray = 100;
 103         num_delarray = 0;
 104         delarray = malloc(max_delarray * sizeof(struct deleted_info));
 105         if (!delarray) {
 106                 com_err("ls_deleted_inodes", ENOMEM,
 107                         "while allocating deleted information storage");
 108                 exit(1);
 109         }
 110
 111         block_buf = malloc(current_fs->blocksize * 3);
 112         if (!block_buf) {
 113                 com_err("ls_deleted_inodes", ENOMEM, "while allocating block buffer");
 114                 goto error_out;
 115         }
 116
 117         retval = ext2fs_open_inode_scan(current_fs, 0, &scan);
 118         if (retval) {
 119                 com_err("ls_deleted_inodes", retval,
 120                         "while opening inode scan");
 121                 goto error_out;
 122         }
 123
 124         do {
 125                 retval = ext2fs_get_next_inode(scan, &ino, &inode);
 126         } while (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE);
 127         if (retval) {
 128                 com_err("ls_deleted_inodes", retval,
 129                         "while starting inode scan");
 130                 goto error_out;
 131         }
 132
 133         while (ino) {
 134                 if ((inode.i_dtime == 0) ||
 135                     (secs && ((unsigned) abs(now - secs) > inode.i_dtime)))
 136                         goto next;
 137
 138                 lsd.inode = ino;
 139                 lsd.num_blocks = 0;
 140                 lsd.free_blocks = 0;
 141                 lsd.bad_blocks = 0;
 142
 143                 retval = ext2fs_block_iterate2(current_fs, ino,
 144                                                BLOCK_FLAG_READ_ONLY, block_buf,
 145                                                lsdel_proc, &lsd);
 146                 if (retval) {
 147                         com_err("ls_deleted_inodes", retval,
 148                                 "while calling ext2fs_block_iterate2");
 149                         goto next;
 150                 }
 151                 if (lsd.free_blocks && !lsd.bad_blocks) {
 152                         if (num_delarray >= max_delarray) {
 153                                 max_delarray += 50;
 154                                 delarray = realloc(delarray,
 155                            max_delarray * sizeof(struct deleted_info));
 156                                 if (!delarray) {
 157                                         com_err("ls_deleted_inodes",
 158                                                 ENOMEM,
 159                                                 "while reallocating array");
 160                                         exit(1);
 161                                 }
 162                         }
 163
 164                         delarray[num_delarray].ino = ino;
 165                         delarray[num_delarray].mode = inode.i_mode;
 166                         delarray[num_delarray].uid = inode_uid(inode);
 167                         delarray[num_delarray].size = inode.i_size;
 168                         if (!LINUX_S_ISDIR(inode.i_mode))
 169                                 delarray[num_delarray].size |=
 170                                         ((__u64) inode.i_size_high << 32);
 171                         delarray[num_delarray].dtime = inode.i_dtime;
 172                         delarray[num_delarray].num_blocks = lsd.num_blocks;
 173                         delarray[num_delarray].free_blocks = lsd.free_blocks;
 174                         num_delarray++;
 175                 }
 176
 177         next:
 178                 do {
 179                         retval = ext2fs_get_next_inode(scan, &ino, &inode);
 180                 } while (retval == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE);
 181                 if (retval) {
 182                         com_err("ls_deleted_inodes", retval,
 183                                 "while doing inode scan");
 184                         goto error_out;
 185                 }
 186         }
 187
 188         out = open_pager();
 189
 190         fprintf(out, " Inode  Owner  Mode    Size      Blocks   Time deleted\n");
 191
 192         qsort(delarray, num_delarray, sizeof(struct deleted_info),
 193               deleted_info_compare);
 194
 195         for (i = 0; i < num_delarray; i++) {
 196                 fprintf(out, "%6u %6d %6o %6llu %6lld/%6lld %s",
 197                         delarray[i].ino,
 198                         delarray[i].uid, delarray[i].mode, delarray[i].size,
 199                         delarray[i].free_blocks, delarray[i].num_blocks,
 200                         time_to_string(delarray[i].dtime));
 201         }
 202         fprintf(out, "%d deleted inodes found.\n", num_delarray);
 203         close_pager(out);
 204
 205 error_out:
 206         free(block_buf);
 207         free(delarray);
 208         if (scan)
 209                 ext2fs_close_inode_scan(scan);
 210         return;
 211 }
 212
 213
 214