src/vfs/undelfs/undelfs.c

   1 /* UnDel File System: Midnight Commander file system.
   2
   3    This file system is intended to be used together with the
   4    ext2fs library to recover files from ext2fs file systems.
   5
   6    Parts of this program were taken from the lsdel.c and dump.c files
   7    written by Ted Ts'o (tytso@mit.edu) for the ext2fs package.
   8
   9    Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
  10    2005, 2007 Free Software Foundation, Inc.
  11    Written by: 1995 Miguel de Icaza.
  12    1997 Norbert Warmuth.
  13    2000 Pavel Machek
  14
  15    This program is free software; you can redistribute it and/or
  16    modify it under the terms of the GNU Library General Public License
  17    as published by the Free Software Foundation; either version 2 of
  18    the License, or (at your option) any later version.
  19
  20    This program is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU Library General Public License for more details.
  24
  25    You should have received a copy of the GNU Library General Public
  26    License along with this program; if not, write to the Free Software
  27    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  28
  29 /**
  30  * \file
  31  * \brief Source: UnDel File System
  32  *
  33  * Assumptions:
  34  *
  35  * 1. We don't handle directories (thus undelfs_get_path is easy to write).
  36  * 2. Files are on the local file system (we do not support vfs files
  37  *    because we would have to provide an io_manager for the ext2fs tools,
  38  *    and I don't think it would be too useful to undelete files
  39  */
  40
  41 #include <config.h>
  42
  43 #include <errno.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <fcntl.h>
  47
  48 #ifdef HAVE_EXT2FS_EXT2_FS_H
  49 #include <ext2fs/ext2_fs.h>
  50 #else
  51 /* asm/types.h defines its own umode_t */
  52 #undef umode_t
  53 #include <linux/ext2_fs.h>
  54 #endif
  55
  56 #include <ext2fs/ext2fs.h>
  57 #include <ctype.h>
  58
  59 #include "lib/global.h"
  60
  61 #include "lib/widget.h"         /* message() */
  62 #include "lib/vfs/utilvfs.h"
  63 #include "lib/vfs/vfs.h"
  64
  65 #include "undelfs.h"
  66
  67 /*** global variables ****************************************************************************/
  68
  69 /*** file scope macro definitions ****************************************************************/
  70
  71 /* To generate the . and .. entries use -2 */
  72 #define READDIR_PTR_INIT 0
  73
  74 #define undelfs_stat undelfs_lstat
  75
  76 /*** file scope type declarations ****************************************************************/
  77
  78 struct deleted_info
  79 {
  80     ext2_ino_t ino;
  81     unsigned short mode;
  82     unsigned short uid;
  83     unsigned short gid;
  84     unsigned long size;
  85     time_t dtime;
  86     int num_blocks;
  87     int free_blocks;
  88 };
  89
  90 struct lsdel_struct
  91 {
  92     ext2_ino_t inode;
  93     int num_blocks;
  94     int free_blocks;
  95     int bad_blocks;
  96 };
  97
  98 typedef struct
  99 {
 100     int f_index;                /* file index into delarray */
 101     char *buf;
 102     int error_code;             /*  */
 103     off_t pos;                  /* file position */
 104     off_t current;              /* used to determine current position in itereate */
 105     gboolean finished;
 106     ext2_ino_t inode;
 107     int bytes_read;
 108     off_t size;
 109
 110     /* Used by undelfs_read: */
 111     char *dest_buffer;          /* destination buffer */
 112     size_t count;               /* bytes to read */
 113 } undelfs_file;
 114
 115 /*** file scope variables ************************************************************************/
 116
 117 /* We only allow one opened ext2fs */
 118 static char *ext2_fname;
 119 static ext2_filsys fs = NULL;
 120 static struct lsdel_struct lsd;
 121 static struct deleted_info *delarray;
 122 static int num_delarray, max_delarray;
 123 static char *block_buf;
 124 static const char *undelfserr = N_("undelfs: error");
 125 static int readdir_ptr;
 126 static int undelfs_usage;
 127 static struct vfs_class vfs_undelfs_ops;
 128
 129 /*** file scope functions ************************************************************************/
 130 /* --------------------------------------------------------------------------------------------- */
 131
 132 static void
 133 undelfs_shutdown (void)
 134 {
 135     if (fs)
 136         ext2fs_close (fs);
 137     fs = NULL;
 138     g_free (ext2_fname);
 139     ext2_fname = NULL;
 140     g_free (delarray);
 141     delarray = NULL;
 142     g_free (block_buf);
 143     block_buf = NULL;
 144 }
 145
 146 /* --------------------------------------------------------------------------------------------- */
 147
 148 static void
 149 undelfs_get_path (const char *dirname, char **fsname, char **file)
 150 {
 151     const char *p;
 152
 153     /* To look like filesystem, we have virtual directories
 154        /#undel:XXX, which have no subdirectories. XXX is replaced with
 155        hda5, sdb8 etc, which is assumed to live under /dev.
 156        -- pavel@ucw.cz */
 157
 158     *fsname = NULL;
 159
 160     if (strncmp (dirname, "/#undel:", 8))
 161         return;
 162
 163     dirname += 8;
 164
 165     /* Since we don't allow subdirectories, it's easy to get a filename,
 166      * just scan backwards for a slash */
 167     if (*dirname == 0)
 168         return;
 169
 170     p = dirname + strlen (dirname);
 171 #if 0
 172     /* Strip trailing ./
 173      */
 174     if (p - dirname > 2 && *(p - 1) == '/' && *(p - 2) == '.')
 175         *(p = p - 2) = 0;
 176 #endif
 177
 178     while (p > dirname)
 179     {
 180         if (*p == '/')
 181         {
 182             char *tmp;
 183
 184             *file = g_strdup (p + 1);
 185             tmp = g_strndup (dirname, p - dirname);
 186             *fsname = g_strconcat ("/dev/", tmp, (char *) NULL);
 187             g_free (tmp);
 188             return;
 189         }
 190         p--;
 191     }
 192     *file = g_strdup ("");
 193     *fsname = g_strconcat ("/dev/", dirname, (char *) NULL);
 194     return;
 195 }
 196
 197 /* --------------------------------------------------------------------------------------------- */
 198
 199 static int
 200 undelfs_lsdel_proc (ext2_filsys _fs, blk_t * block_nr, int blockcnt, void *private)
 201 {
 202     struct lsdel_struct *_lsd = (struct lsdel_struct *) private;
 203     (void) blockcnt;
 204     _lsd->num_blocks++;
 205
 206     if (*block_nr < _fs->super->s_first_data_block || *block_nr >= _fs->super->s_blocks_count)
 207     {
 208         _lsd->bad_blocks++;
 209         return BLOCK_ABORT;
 210     }
 211
 212     if (!ext2fs_test_block_bitmap (_fs->block_map, *block_nr))
 213         _lsd->free_blocks++;
 214
 215     return 0;
 216 }
 217
 218 /* --------------------------------------------------------------------------------------------- */
 219 /**
 220  * Load information about deleted files.
 221  * Don't abort if there is not enough memory - load as much as we can.
 222  */
 223
 224 static int
 225 undelfs_loaddel (void)
 226 {
 227     int retval, count;
 228     ext2_ino_t ino;
 229     struct ext2_inode inode;
 230     ext2_inode_scan scan;
 231
 232     max_delarray = 100;
 233     num_delarray = 0;
 234     delarray = g_try_malloc (sizeof (struct deleted_info) * max_delarray);
 235     if (!delarray)
 236     {
 237         message (D_ERROR, undelfserr, _("not enough memory"));
 238         return 0;
 239     }
 240     block_buf = g_try_malloc (fs->blocksize * 3);
 241     if (!block_buf)
 242     {
 243         message (D_ERROR, undelfserr, _("while allocating block buffer"));
 244         goto free_delarray;
 245     }
 246     retval = ext2fs_open_inode_scan (fs, 0, &scan);
 247     if (retval != 0)
 248     {
 249         message (D_ERROR, undelfserr, _("open_inode_scan: %d"), retval);
 250         goto free_block_buf;
 251     }
 252     retval = ext2fs_get_next_inode (scan, &ino, &inode);
 253     if (retval != 0)
 254     {
 255         message (D_ERROR, undelfserr, _("while starting inode scan %d"), retval);
 256         goto error_out;
 257     }
 258     count = 0;
 259     while (ino)
 260     {
 261         if ((count++ % 1024) == 0)
 262             vfs_print_message (_("undelfs: loading deleted files information %d inodes"), count);
 263         if (inode.i_dtime == 0)
 264             goto next;
 265
 266         if (S_ISDIR (inode.i_mode))
 267             goto next;
 268
 269         lsd.inode = ino;
 270         lsd.num_blocks = 0;
 271         lsd.free_blocks = 0;
 272         lsd.bad_blocks = 0;
 273
 274         retval = ext2fs_block_iterate (fs, ino, 0, block_buf, undelfs_lsdel_proc, &lsd);
 275         if (retval)
 276         {
 277             message (D_ERROR, undelfserr, _("while calling ext2_block_iterate %d"), retval);
 278             goto next;
 279         }
 280         if (lsd.free_blocks && !lsd.bad_blocks)
 281         {
 282             if (num_delarray >= max_delarray)
 283             {
 284                 struct deleted_info *delarray_new = g_try_realloc (delarray,
 285                                                                    sizeof (struct deleted_info) *
 286                                                                    (max_delarray + 50));
 287                 if (!delarray_new)
 288                 {
 289                     message (D_ERROR, undelfserr, _("no more memory while reallocating array"));
 290                     goto error_out;
 291                 }
 292                 delarray = delarray_new;
 293                 max_delarray += 50;
 294             }
 295
 296             delarray[num_delarray].ino = ino;
 297             delarray[num_delarray].mode = inode.i_mode;
 298             delarray[num_delarray].uid = inode.i_uid;
 299             delarray[num_delarray].gid = inode.i_gid;
 300             delarray[num_delarray].size = inode.i_size;
 301             delarray[num_delarray].dtime = inode.i_dtime;
 302             delarray[num_delarray].num_blocks = lsd.num_blocks;
 303             delarray[num_delarray].free_blocks = lsd.free_blocks;
 304             num_delarray++;
 305         }
 306
 307       next:
 308         retval = ext2fs_get_next_inode (scan, &ino, &inode);
 309         if (retval)
 310         {
 311             message (D_ERROR, undelfserr, _("while doing inode scan %d"), retval);
 312             goto error_out;
 313         }
 314     }
 315     readdir_ptr = READDIR_PTR_INIT;
 316     ext2fs_close_inode_scan (scan);
 317     return 1;
 318
 319   error_out:
 320     ext2fs_close_inode_scan (scan);
 321   free_block_buf:
 322     g_free (block_buf);
 323     block_buf = NULL;
 324   free_delarray:
 325     g_free (delarray);
 326     delarray = NULL;
 327     return 0;
 328 }
 329
 330 /* --------------------------------------------------------------------------------------------- */
 331
 332 static void *
 333 undelfs_opendir (struct vfs_class *me, const char *dirname)
 334 {
 335     char *file, *f;
 336
 337     undelfs_get_path (dirname, &file, &f);
 338     if (!file)
 339         return 0;
 340
 341     /* We don't use the file name */
 342     g_free (f);
 343
 344     if (!ext2_fname || strcmp (ext2_fname, file))
 345     {
 346         undelfs_shutdown ();
 347         ext2_fname = file;
 348     }
 349     else
 350     {
 351         /* To avoid expensive re-scannings */
 352         readdir_ptr = READDIR_PTR_INIT;
 353         g_free (file);
 354         return fs;
 355     }
 356
 357     if (ext2fs_open (ext2_fname, 0, 0, 0, unix_io_manager, &fs))
 358     {
 359         message (D_ERROR, undelfserr, _("Cannot open file %s"), ext2_fname);
 360         return 0;
 361     }
 362     vfs_print_message (_("undelfs: reading inode bitmap..."));
 363     if (ext2fs_read_inode_bitmap (fs))
 364     {
 365         message (D_ERROR, undelfserr, _("Cannot load inode bitmap from:\n%s"), ext2_fname);
 366         goto quit_opendir;
 367     }
 368     vfs_print_message (_("undelfs: reading block bitmap..."));
 369     if (ext2fs_read_block_bitmap (fs))
 370     {
 371         message (D_ERROR, undelfserr, _("Cannot load block bitmap from:\n%s"), ext2_fname);
 372         goto quit_opendir;
 373     }
 374     /* Now load the deleted information */
 375     if (!undelfs_loaddel ())
 376         goto quit_opendir;
 377     vfs_print_message (_("%s: done."), me->name);
 378     return fs;
 379   quit_opendir:
 380     vfs_print_message (_("%s: failure"), me->name);
 381     ext2fs_close (fs);
 382     fs = NULL;
 383     return 0;
 384 }
 385
 386 /* --------------------------------------------------------------------------------------------- */
 387
 388 static void *
 389 undelfs_readdir (void *vfs_info)
 390 {
 391     static union vfs_dirent undelfs_readdir_data;
 392     static char *const dirent_dest = undelfs_readdir_data.dent.d_name;
 393
 394     if (vfs_info != fs)
 395     {
 396         message (D_ERROR, undelfserr, _("vfs_info is not fs!"));
 397         return NULL;
 398     }
 399     if (readdir_ptr == num_delarray)
 400         return NULL;
 401     if (readdir_ptr < 0)
 402         strcpy (dirent_dest, readdir_ptr == -2 ? "." : "..");
 403     else
 404         g_snprintf (dirent_dest, MC_MAXPATHLEN, "%ld:%d",
 405                     (long) delarray[readdir_ptr].ino, delarray[readdir_ptr].num_blocks);
 406     readdir_ptr++;
 407
 408     compute_namelen (&undelfs_readdir_data.dent);
 409
 410     return &undelfs_readdir_data;
 411 }
 412
 413 /* --------------------------------------------------------------------------------------------- */
 414
 415 static int
 416 undelfs_closedir (void *vfs_info)
 417 {
 418     (void) vfs_info;
 419     return 0;
 420 }
 421
 422 /* --------------------------------------------------------------------------------------------- */
 423 /* We do not support lseek */
 424
 425 static void *
 426 undelfs_open (const vfs_path_t * vpath, int flags, mode_t mode)
 427 {
 428     char *file, *f;
 429     ext2_ino_t inode, i;
 430     undelfs_file *p = NULL;
 431     (void) flags;
 432     (void) mode;
 433
 434     /* Only allow reads on this file system */
 435     undelfs_get_path (vpath->unparsed, &file, &f);
 436     if (!file)
 437         return 0;
 438
 439     if (!ext2_fname || strcmp (ext2_fname, file))
 440     {
 441         message (D_ERROR, undelfserr, _("You have to chdir to extract files first"));
 442         g_free (file);
 443         g_free (f);
 444         return 0;
 445     }
 446     inode = atol (f);
 447
 448     /* Search the file into delarray */
 449     for (i = 0; i < (ext2_ino_t) num_delarray; i++)
 450     {
 451         if (inode != delarray[i].ino)
 452             continue;
 453
 454         /* Found: setup all the structures needed by read */
 455         p = (undelfs_file *) g_try_malloc (((gsize) sizeof (undelfs_file)));
 456         if (!p)
 457         {
 458             g_free (file);
 459             g_free (f);
 460             return 0;
 461         }
 462         p->buf = g_try_malloc (fs->blocksize);
 463         if (!p->buf)
 464         {
 465             g_free (p);
 466             g_free (file);
 467             g_free (f);
 468             return 0;
 469         }
 470         p->inode = inode;
 471         p->finished = FALSE;
 472         p->f_index = i;
 473         p->error_code = 0;
 474         p->pos = 0;
 475         p->size = delarray[i].size;
 476     }
 477     g_free (file);
 478     g_free (f);
 479     undelfs_usage++;
 480     return p;
 481 }
 482
 483 /* --------------------------------------------------------------------------------------------- */
 484
 485 static int
 486 undelfs_close (void *vfs_info)
 487 {
 488     undelfs_file *p = vfs_info;
 489     g_free (p->buf);
 490     g_free (p);
 491     undelfs_usage--;
 492     return 0;
 493 }
 494
 495 /* --------------------------------------------------------------------------------------------- */
 496
 497 static int
 498 undelfs_dump_read (ext2_filsys param_fs, blk_t * blocknr, int blockcnt, void *private)
 499 {
 500     int copy_count;
 501     undelfs_file *p = (undelfs_file *) private;
 502
 503     if (blockcnt < 0)
 504         return 0;
 505
 506     if (*blocknr)
 507     {
 508         p->error_code = io_channel_read_blk (param_fs->io, *blocknr, 1, p->buf);
 509         if (p->error_code)
 510             return BLOCK_ABORT;
 511     }
 512     else
 513         memset (p->buf, 0, param_fs->blocksize);
 514
 515     if (p->pos + (off_t) p->count < p->current)
 516     {
 517         p->finished = TRUE;
 518         return BLOCK_ABORT;
 519     }
 520     if (p->pos > p->current + param_fs->blocksize)
 521     {
 522         p->current += param_fs->blocksize;
 523         return 0;               /* we have not arrived yet */
 524     }
 525
 526     /* Now, we know we have to extract some data */
 527     if (p->pos >= p->current)
 528     {
 529
 530         /* First case: starting pointer inside this block */
 531         if (p->pos + (off_t) p->count <= p->current + param_fs->blocksize)
 532         {
 533             /* Fully contained */
 534             copy_count = p->count;
 535             p->finished = (p->count != 0);
 536         }
 537         else
 538         {
 539             /* Still some more data */
 540             copy_count = param_fs->blocksize - (p->pos - p->current);
 541         }
 542         memcpy (p->dest_buffer, p->buf + (p->pos - p->current), copy_count);
 543     }
 544     else
 545     {
 546         /* Second case: we already have passed p->pos */
 547         if (p->pos + (off_t) p->count < p->current + param_fs->blocksize)
 548         {
 549             copy_count = (p->pos + p->count) - p->current;
 550             p->finished = (p->count != 0);
 551         }
 552         else
 553         {
 554             copy_count = param_fs->blocksize;
 555         }
 556         memcpy (p->dest_buffer, p->buf, copy_count);
 557     }
 558     p->dest_buffer += copy_count;
 559     p->current += param_fs->blocksize;
 560     if (p->finished)
 561     {
 562         return BLOCK_ABORT;
 563     }
 564     return 0;
 565 }
 566
 567 /* --------------------------------------------------------------------------------------------- */
 568
 569 static ssize_t
 570 undelfs_read (void *vfs_info, char *buffer, size_t count)
 571 {
 572     undelfs_file *p = vfs_info;
 573     int retval;
 574
 575     p->dest_buffer = buffer;
 576     p->current = 0;
 577     p->finished = FALSE;
 578     p->count = count;
 579
 580     if (p->pos + (off_t) p->count > p->size)
 581     {
 582         p->count = p->size - p->pos;
 583     }
 584     retval = ext2fs_block_iterate (fs, p->inode, 0, NULL, undelfs_dump_read, p);
 585     if (retval)
 586     {
 587         message (D_ERROR, undelfserr, _("while iterating over blocks"));
 588         return -1;
 589     }
 590     if (p->error_code && !p->finished)
 591         return 0;
 592     p->pos = p->pos + (p->dest_buffer - buffer);
 593     return p->dest_buffer - buffer;
 594 }
 595
 596 /* --------------------------------------------------------------------------------------------- */
 597
 598 static long
 599 undelfs_getindex (char *path)
 600 {
 601     ext2_ino_t inode = atol (path);
 602     int i;
 603
 604     for (i = 0; i < num_delarray; i++)
 605     {
 606         if (delarray[i].ino == inode)
 607             return i;
 608     }
 609     return -1;
 610 }
 611
 612 /* --------------------------------------------------------------------------------------------- */
 613
 614 static int
 615 undelfs_stat_int (int inode_index, struct stat *buf)
 616 {
 617     buf->st_dev = 0;
 618     buf->st_ino = delarray[inode_index].ino;
 619     buf->st_mode = delarray[inode_index].mode;
 620     buf->st_nlink = 1;
 621     buf->st_uid = delarray[inode_index].uid;
 622     buf->st_gid = delarray[inode_index].gid;
 623     buf->st_size = delarray[inode_index].size;
 624     buf->st_atime = delarray[inode_index].dtime;
 625     buf->st_ctime = delarray[inode_index].dtime;
 626     buf->st_mtime = delarray[inode_index].dtime;
 627     return 0;
 628 }
 629
 630 /* --------------------------------------------------------------------------------------------- */
 631
 632 static int
 633 undelfs_lstat (struct vfs_class *me, const char *path, struct stat *buf)
 634 {
 635     int inode_index;
 636     char *file, *f;
 637     (void) me;
 638
 639     undelfs_get_path (path, &file, &f);
 640     if (!file)
 641         return 0;
 642
 643     /* When called from save_cwd_stats we get an incorrect file and f here:
 644        e.g. incorrect                         correct
 645        path = "undel:/dev/sda1"          path="undel:/dev/sda1/401:1"
 646        file = "/dev"                     file="/dev/sda1"
 647        f    = "sda1"                     f   ="401:1"
 648        If the first char in f is no digit -> return error */
 649     if (!isdigit (*f))
 650     {
 651         g_free (file);
 652         g_free (f);
 653         return -1;
 654     }
 655
 656     if (!ext2_fname || strcmp (ext2_fname, file))
 657     {
 658         message (D_ERROR, undelfserr, _("You have to chdir to extract files first"));
 659         g_free (file);
 660         g_free (f);
 661         return 0;
 662     }
 663     inode_index = undelfs_getindex (f);
 664     g_free (file);
 665     g_free (f);
 666
 667     if (inode_index == -1)
 668         return -1;
 669
 670     return undelfs_stat_int (inode_index, buf);
 671 }
 672
 673 /* --------------------------------------------------------------------------------------------- */
 674
 675 static int
 676 undelfs_fstat (void *vfs_info, struct stat *buf)
 677 {
 678     undelfs_file *p = vfs_info;
 679
 680     return undelfs_stat_int (p->f_index, buf);
 681 }
 682
 683 /* --------------------------------------------------------------------------------------------- */
 684
 685 static int
 686 undelfs_chdir (struct vfs_class *me, const char *path)
 687 {
 688     char *file, *f;
 689     int fd;
 690     (void) me;
 691
 692     undelfs_get_path (path, &file, &f);
 693     if (!file)
 694         return -1;
 695
 696     /* We may use access because ext2 file systems are local */
 697     /* this could be fixed by making an ext2fs io manager to use */
 698     /* our vfs, but that is left as an excercise for the reader */
 699     fd = open (file, O_RDONLY);
 700     if (fd == -1)
 701     {
 702         message (D_ERROR, undelfserr, _("Cannot open file \"%s\""), file);
 703         g_free (f);
 704         g_free (file);
 705         return -1;
 706     }
 707     close (fd);
 708     g_free (f);
 709     g_free (file);
 710     return 0;
 711 }
 712
 713 /* --------------------------------------------------------------------------------------------- */
 714
 715 /* this has to stay here for now: vfs layer does not know how to emulate it */
 716 static off_t
 717 undelfs_lseek (void *vfs_info, off_t offset, int whence)
 718 {
 719     (void) vfs_info;
 720     (void) offset;
 721     (void) whence;
 722
 723     return -1;
 724 }
 725
 726 /* --------------------------------------------------------------------------------------------- */
 727
 728 static vfsid
 729 undelfs_getid (struct vfs_class *me, const char *path)
 730 {
 731     char *fname, *fsname;
 732     (void) me;
 733
 734     undelfs_get_path (path, &fsname, &fname);
 735
 736     if (!fsname)
 737         return NULL;
 738     g_free (fname);
 739     g_free (fsname);
 740     return (vfsid) fs;
 741 }
 742
 743 /* --------------------------------------------------------------------------------------------- */
 744
 745 static int
 746 undelfs_nothingisopen (vfsid id)
 747 {
 748     (void) id;
 749
 750     return !undelfs_usage;
 751 }
 752
 753 /* --------------------------------------------------------------------------------------------- */
 754
 755 static void
 756 undelfs_free (vfsid id)
 757 {
 758     (void) id;
 759
 760     undelfs_shutdown ();
 761 }
 762
 763 /* --------------------------------------------------------------------------------------------- */
 764
 765 #ifdef ENABLE_NLS
 766 static int
 767 undelfs_init (struct vfs_class *me)
 768 {
 769     (void) me;
 770
 771     undelfserr = _(undelfserr);
 772     return 1;
 773 }
 774 #else
 775 #define undelfs_init NULL
 776 #endif
 777
 778 /* --------------------------------------------------------------------------------------------- */
 779 /*** public functions ****************************************************************************/
 780 /* --------------------------------------------------------------------------------------------- */
 781 /**
 782  * This function overrides com_err() from libcom_err library.
 783  * It is used in libext2fs to report errors.
 784  */
 785
 786 void
 787 com_err (const char *whoami, long err_code, const char *fmt, ...)
 788 {
 789     va_list ap;
 790     char *str;
 791
 792     va_start (ap, fmt);
 793     str = g_strdup_vprintf (fmt, ap);
 794     va_end (ap);
 795
 796     message (D_ERROR, _("Ext2lib error"), "%s (%s: %ld)", str, whoami, err_code);
 797     g_free (str);
 798 }
 799
 800 /* --------------------------------------------------------------------------------------------- */
 801
 802 void
 803 init_undelfs (void)
 804 {
 805     vfs_undelfs_ops.name = "undelfs";
 806     vfs_undelfs_ops.prefix = "undel:";
 807     vfs_undelfs_ops.init = undelfs_init;
 808     vfs_undelfs_ops.open = undelfs_open;
 809     vfs_undelfs_ops.close = undelfs_close;
 810     vfs_undelfs_ops.read = undelfs_read;
 811     vfs_undelfs_ops.opendir = undelfs_opendir;
 812     vfs_undelfs_ops.readdir = undelfs_readdir;
 813     vfs_undelfs_ops.closedir = undelfs_closedir;
 814     vfs_undelfs_ops.stat = undelfs_stat;
 815     vfs_undelfs_ops.lstat = undelfs_lstat;
 816     vfs_undelfs_ops.fstat = undelfs_fstat;
 817     vfs_undelfs_ops.chdir = undelfs_chdir;
 818     vfs_undelfs_ops.lseek = undelfs_lseek;
 819     vfs_undelfs_ops.getid = undelfs_getid;
 820     vfs_undelfs_ops.nothingisopen = undelfs_nothingisopen;
 821     vfs_undelfs_ops.free = undelfs_free;
 822     vfs_register_class (&vfs_undelfs_ops);
 823 }
 824
 825 /* --------------------------------------------------------------------------------------------- */