src/vfs/undelfs/undelfs.c

src/vfs/undelfs/undelfs.c
/* */
This source file includes following definitions.
undelfs_shutdown
undelfs_get_path
undelfs_lsdel_proc
undelfs_loaddel
undelfs_opendir
undelfs_readdir
undelfs_closedir
undelfs_open
undelfs_close
undelfs_dump_read
undelfs_read
undelfs_getindex
undelfs_stat_int
undelfs_lstat
undelfs_fstat
undelfs_chdir
undelfs_lseek
undelfs_getid
undelfs_nothingisopen
undelfs_free
undelfs_init
com_err
vfs_init_undelfs
   1 /*
   2    UnDel File System: Midnight Commander file system.
   3 
   4    This file system is intended to be used together with the
   5    ext2fs library to recover files from ext2fs file systems.
   6 
   7    Parts of this program were taken from the lsdel.c and dump.c files
   8    written by Ted Ts'o (tytso@mit.edu) for the ext2fs package.
   9 
  10    Copyright (C) 1995-2025
  11    Free Software Foundation, Inc.
  12 
  13    Written by:
  14    Miguel de Icaza, 1995
  15    Norbert Warmuth, 1997
  16    Pavel Machek, 2000
  17 
  18    This file is part of the Midnight Commander.
  19 
  20    The Midnight Commander is free software: you can redistribute it
  21    and/or modify it under the terms of the GNU General Public License as
  22    published by the Free Software Foundation, either version 3 of the License,
  23    or (at your option) any later version.
  24 
  25    The Midnight Commander is distributed in the hope that it will be useful,
  26    but WITHOUT ANY WARRANTY; without even the implied warranty of
  27    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28    GNU General Public License for more details.
  29 
  30    You should have received a copy of the GNU General Public License
  31    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  32  */
  33 
  34 /**
  35  * \file
  36  * \brief Source: UnDel File System
  37  *
  38  * Assumptions:
  39  *
  40  * 1. We don't handle directories (thus undelfs_get_path is easy to write).
  41  * 2. Files are on the local file system (we do not support vfs files
  42  *    because we would have to provide an io_manager for the ext2fs tools,
  43  *    and I don't think it would be too useful to undelete files
  44  */
  45 
  46 #include <config.h>
  47 
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>  // memset()
  51 #include <ext2fs/ext2_fs.h>
  52 #include <ext2fs/ext2fs.h>
  53 #include <ctype.h>
  54 
  55 #include "lib/global.h"
  56 
  57 #include "lib/util.h"
  58 #include "lib/widget.h"  // message()
  59 #include "lib/vfs/xdirentry.h"
  60 #include "lib/vfs/utilvfs.h"
  61 #include "lib/vfs/vfs.h"
  62 
  63 #include "undelfs.h"
  64 
  65 /*** global variables ****************************************************************************/
  66 
  67 /*** file scope macro definitions ****************************************************************/
  68 
  69 /* To generate the . and .. entries use -2 */
  70 #define READDIR_PTR_INIT 0
  71 
  72 #define undelfs_stat     undelfs_lstat
  73 
  74 /*** file scope type declarations ****************************************************************/
  75 
  76 struct deleted_info
  77 {
  78     ext2_ino_t ino;
  79     unsigned short mode;
  80     unsigned short uid;
  81     unsigned short gid;
  82     unsigned long size;
  83     time_t dtime;
  84     int num_blocks;
  85     int free_blocks;
  86 };
  87 
  88 struct lsdel_struct
  89 {
  90     ext2_ino_t inode;
  91     int num_blocks;
  92     int free_blocks;
  93     int bad_blocks;
  94 };
  95 
  96 typedef struct
  97 {
  98     int f_index;  // file index into delarray
  99     char *buf;
 100     int error_code;  //
 101     off_t pos;       // file position
 102     off_t current;   // used to determine current position in itereate
 103     gboolean finished;
 104     ext2_ino_t inode;
 105     int bytes_read;
 106     off_t size;
 107 
 108     // Used by undelfs_read:
 109     char *dest_buffer;  // destination buffer
 110     size_t count;       // bytes to read
 111 } undelfs_file;
 112 
 113 /*** forward declarations (file scope functions) *************************************************/
 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 
 128 static struct vfs_s_subclass undelfs_subclass;
 129 static struct vfs_class *vfs_undelfs_ops = VFS_CLASS (&undelfs_subclass);
 130 
 131 /* --------------------------------------------------------------------------------------------- */
 132 /*** file scope functions ************************************************************************/
 133 /* --------------------------------------------------------------------------------------------- */
 134 
 135 static void
 136 undelfs_shutdown (void)
     /*   */
 137 {
 138     if (fs)
 139         ext2fs_close (fs);
 140     fs = NULL;
 141     MC_PTR_FREE (ext2_fname);
 142     MC_PTR_FREE (delarray);
 143     MC_PTR_FREE (block_buf);
 144 }
 145 
 146 /* --------------------------------------------------------------------------------------------- */
 147 
 148 static void
 149 undelfs_get_path (const vfs_path_t *vpath, char **fsname, char **file)
     /*   */
 150 {
 151     const char *p, *dirname;
 152 
 153     dirname = vfs_path_get_last_path_str (vpath);
 154 
 155     /* To look like filesystem, we have virtual directories
 156        undel://XXX, which have no subdirectories. XXX is replaced with
 157        hda5, sdb8 etc, which is assumed to live under /dev.
 158        -- pavel@ucw.cz */
 159 
 160     *fsname = NULL;
 161 
 162     if (strncmp (dirname, "undel://", 8) != 0)
 163         return;
 164 
 165     dirname += 8;
 166 
 167     /* Since we don't allow subdirectories, it's easy to get a filename,
 168      * just scan backwards for a slash */
 169     if (*dirname == '\0')
 170         return;
 171 
 172     p = dirname + strlen (dirname);
 173 #if 0
 174     /* Strip trailing ./
 175      */
 176     if (p - dirname > 2 && IS_PATH_SEP (p[-1]) && p[-2] == '.')
 177         *(p = p - 2) = 0;
 178 #endif
 179 
 180     while (p > dirname)
 181     {
 182         if (IS_PATH_SEP (*p))
 183         {
 184             char *tmp;
 185 
 186             *file = g_strdup (p + 1);
 187             tmp = g_strndup (dirname, p - dirname);
 188             *fsname = g_strconcat ("/dev/", tmp, (char *) NULL);
 189             g_free (tmp);
 190             return;
 191         }
 192         p--;
 193     }
 194     *file = g_strdup ("");
 195     *fsname = g_strconcat ("/dev/", dirname, (char *) NULL);
 196 }
 197 
 198 /* --------------------------------------------------------------------------------------------- */
 199 
 200 static int
 201 undelfs_lsdel_proc (ext2_filsys _fs, blk_t *block_nr, int blockcnt, void *private)
     /*   */
 202 {
 203     struct lsdel_struct *_lsd = (struct lsdel_struct *) private;
 204     (void) blockcnt;
 205     _lsd->num_blocks++;
 206 
 207     if (*block_nr < _fs->super->s_first_data_block || *block_nr >= _fs->super->s_blocks_count)
 208     {
 209         _lsd->bad_blocks++;
 210         return BLOCK_ABORT;
 211     }
 212 
 213     if (!ext2fs_test_block_bitmap (_fs->block_map, *block_nr))
 214         _lsd->free_blocks++;
 215 
 216     return 0;
 217 }
 218 
 219 /* --------------------------------------------------------------------------------------------- */
 220 /**
 221  * Load information about deleted files.
 222  * Don't abort if there is not enough memory - load as much as we can.
 223  */
 224 
 225 static int
 226 undelfs_loaddel (void)
     /*   */
 227 {
 228     int retval, count;
 229     ext2_ino_t ino;
 230     struct ext2_inode inode;
 231     ext2_inode_scan scan;
 232 
 233     max_delarray = 100;
 234     num_delarray = 0;
 235     delarray = g_try_malloc (sizeof (struct deleted_info) * max_delarray);
 236     if (!delarray)
 237     {
 238         message (D_ERROR, undelfserr, "%s", _ ("not enough memory"));
 239         return 0;
 240     }
 241     block_buf = g_try_malloc (fs->blocksize * 3);
 242     if (!block_buf)
 243     {
 244         message (D_ERROR, undelfserr, "%s", _ ("while allocating block buffer"));
 245         goto free_delarray;
 246     }
 247     retval = ext2fs_open_inode_scan (fs, 0, &scan);
 248     if (retval != 0)
 249     {
 250         message (D_ERROR, undelfserr, _ ("open_inode_scan: %d"), retval);
 251         goto free_block_buf;
 252     }
 253     retval = ext2fs_get_next_inode (scan, &ino, &inode);
 254     if (retval != 0)
 255     {
 256         message (D_ERROR, undelfserr, _ ("while starting inode scan %d"), retval);
 257         goto error_out;
 258     }
 259     count = 0;
 260     while (ino)
 261     {
 262         if ((count++ % 1024) == 0)
 263             vfs_print_message (_ ("undelfs: loading deleted files information %d inodes"), count);
 264         if (inode.i_dtime == 0)
 265             goto next;
 266 
 267         if (S_ISDIR (inode.i_mode))
 268             goto next;
 269 
 270         lsd.inode = ino;
 271         lsd.num_blocks = 0;
 272         lsd.free_blocks = 0;
 273         lsd.bad_blocks = 0;
 274 
 275         retval = ext2fs_block_iterate (fs, ino, 0, block_buf, undelfs_lsdel_proc, &lsd);
 276         if (retval)
 277         {
 278             message (D_ERROR, undelfserr, _ ("while calling ext2_block_iterate %d"), retval);
 279             goto next;
 280         }
 281         if (lsd.free_blocks && !lsd.bad_blocks)
 282         {
 283             if (num_delarray >= max_delarray)
 284             {
 285                 struct deleted_info *delarray_new =
 286                     g_try_realloc (delarray, sizeof (struct deleted_info) * (max_delarray + 50));
 287                 if (!delarray_new)
 288                 {
 289                     message (D_ERROR, undelfserr, "%s",
 290                              _ ("no more memory while reallocating array"));
 291                     goto error_out;
 292                 }
 293                 delarray = delarray_new;
 294                 max_delarray += 50;
 295             }
 296 
 297             delarray[num_delarray].ino = ino;
 298             delarray[num_delarray].mode = inode.i_mode;
 299             delarray[num_delarray].uid = inode.i_uid;
 300             delarray[num_delarray].gid = inode.i_gid;
 301             delarray[num_delarray].size = inode.i_size;
 302             delarray[num_delarray].dtime = inode.i_dtime;
 303             delarray[num_delarray].num_blocks = lsd.num_blocks;
 304             delarray[num_delarray].free_blocks = lsd.free_blocks;
 305             num_delarray++;
 306         }
 307 
 308     next:
 309         retval = ext2fs_get_next_inode (scan, &ino, &inode);
 310         if (retval)
 311         {
 312             message (D_ERROR, undelfserr, _ ("while doing inode scan %d"), retval);
 313             goto error_out;
 314         }
 315     }
 316     readdir_ptr = READDIR_PTR_INIT;
 317     ext2fs_close_inode_scan (scan);
 318     return 1;
 319 
 320 error_out:
 321     ext2fs_close_inode_scan (scan);
 322 free_block_buf:
 323     MC_PTR_FREE (block_buf);
 324 free_delarray:
 325     MC_PTR_FREE (delarray);
 326     return 0;
 327 }
 328 
 329 /* --------------------------------------------------------------------------------------------- */
 330 
 331 static void *
 332 undelfs_opendir (const vfs_path_t *vpath)
     /*   */
 333 {
 334     char *file, *f = NULL;
 335     const char *class_name;
 336 
 337     class_name = vfs_path_get_last_path_vfs (vpath)->name;
 338     undelfs_get_path (vpath, &file, &f);
 339     if (file == NULL)
 340     {
 341         g_free (f);
 342         return 0;
 343     }
 344 
 345     // We don't use the file name
 346     g_free (f);
 347 
 348     if (!ext2_fname || strcmp (ext2_fname, file))
 349     {
 350         undelfs_shutdown ();
 351         ext2_fname = file;
 352     }
 353     else
 354     {
 355         // To avoid expensive re-scannings
 356         readdir_ptr = READDIR_PTR_INIT;
 357         g_free (file);
 358         return fs;
 359     }
 360 
 361     if (ext2fs_open (ext2_fname, 0, 0, 0, unix_io_manager, &fs))
 362     {
 363         message (D_ERROR, undelfserr, _ ("Cannot open file %s"), ext2_fname);
 364         return 0;
 365     }
 366     vfs_print_message ("%s", _ ("undelfs: reading inode bitmap..."));
 367     if (ext2fs_read_inode_bitmap (fs))
 368     {
 369         message (D_ERROR, undelfserr, _ ("Cannot load inode bitmap from:\n%s"), ext2_fname);
 370         goto quit_opendir;
 371     }
 372     vfs_print_message ("%s", _ ("undelfs: reading block bitmap..."));
 373     if (ext2fs_read_block_bitmap (fs))
 374     {
 375         message (D_ERROR, undelfserr, _ ("Cannot load block bitmap from:\n%s"), ext2_fname);
 376         goto quit_opendir;
 377     }
 378     // Now load the deleted information
 379     if (!undelfs_loaddel ())
 380         goto quit_opendir;
 381     vfs_print_message (_ ("%s: done."), class_name);
 382     return fs;
 383 quit_opendir:
 384     vfs_print_message (_ ("%s: failure"), class_name);
 385     ext2fs_close (fs);
 386     fs = NULL;
 387     return 0;
 388 }
 389 
 390 /* --------------------------------------------------------------------------------------------- */
 391 
 392 static struct vfs_dirent *
 393 undelfs_readdir (void *vfs_info)
     /*   */
 394 {
 395     struct vfs_dirent *dirent;
 396 
 397     if (vfs_info != fs)
 398     {
 399         message (D_ERROR, undelfserr, "%s", _ ("vfs_info is not fs!"));
 400         return NULL;
 401     }
 402     if (readdir_ptr == num_delarray)
 403         return NULL;
 404     if (readdir_ptr < 0)
 405         dirent = vfs_dirent_init (NULL, readdir_ptr == -2 ? "." : "..", 0);  // FIXME: inode
 406     else
 407     {
 408         char dirent_dest[MC_MAXPATHLEN];
 409 
 410         g_snprintf (dirent_dest, MC_MAXPATHLEN, "%ld:%d", (long) delarray[readdir_ptr].ino,
 411                     delarray[readdir_ptr].num_blocks);
 412         dirent = vfs_dirent_init (NULL, dirent_dest, 0);  // FIXME: inode
 413     }
 414     readdir_ptr++;
 415 
 416     return dirent;
 417 }
 418 
 419 /* --------------------------------------------------------------------------------------------- */
 420 
 421 static int
 422 undelfs_closedir (void *vfs_info)
     /*   */
 423 {
 424     (void) vfs_info;
 425     return 0;
 426 }
 427 
 428 /* --------------------------------------------------------------------------------------------- */
 429 /* We do not support lseek */
 430 
 431 static void *
 432 undelfs_open (const vfs_path_t *vpath, int flags, mode_t mode)
     /*   */
 433 {
 434     char *file, *f = NULL;
 435     ext2_ino_t inode, i;
 436     undelfs_file *p = NULL;
 437     (void) flags;
 438     (void) mode;
 439 
 440     // Only allow reads on this file system
 441     undelfs_get_path (vpath, &file, &f);
 442     if (file == NULL)
 443     {
 444         g_free (f);
 445         return 0;
 446     }
 447 
 448     if (!ext2_fname || strcmp (ext2_fname, file))
 449     {
 450         message (D_ERROR, undelfserr, "%s", _ ("You have to chdir to extract files first"));
 451         g_free (file);
 452         g_free (f);
 453         return 0;
 454     }
 455     inode = atol (f);
 456 
 457     // Search the file into delarray
 458     for (i = 0; i < (ext2_ino_t) num_delarray; i++)
 459     {
 460         if (inode != delarray[i].ino)
 461             continue;
 462 
 463         // Found: setup all the structures needed by read
 464         p = (undelfs_file *) g_try_malloc (((gsize) sizeof (undelfs_file)));
 465         if (!p)
 466         {
 467             g_free (file);
 468             g_free (f);
 469             return 0;
 470         }
 471         p->buf = g_try_malloc (fs->blocksize);
 472         if (!p->buf)
 473         {
 474             g_free (p);
 475             g_free (file);
 476             g_free (f);
 477             return 0;
 478         }
 479         p->inode = inode;
 480         p->finished = FALSE;
 481         p->f_index = i;
 482         p->error_code = 0;
 483         p->pos = 0;
 484         p->size = delarray[i].size;
 485     }
 486     g_free (file);
 487     g_free (f);
 488     undelfs_usage++;
 489     return p;
 490 }
 491 
 492 /* --------------------------------------------------------------------------------------------- */
 493 
 494 static int
 495 undelfs_close (void *vfs_info)
     /*   */
 496 {
 497     undelfs_file *p = vfs_info;
 498     g_free (p->buf);
 499     g_free (p);
 500     undelfs_usage--;
 501     return 0;
 502 }
 503 
 504 /* --------------------------------------------------------------------------------------------- */
 505 
 506 static int
 507 undelfs_dump_read (ext2_filsys param_fs, blk_t *blocknr, int blockcnt, void *private)
     /*   */
 508 {
 509     int copy_count;
 510     undelfs_file *p = (undelfs_file *) private;
 511 
 512     if (blockcnt < 0)
 513         return 0;
 514 
 515     if (*blocknr)
 516     {
 517         p->error_code = io_channel_read_blk (param_fs->io, *blocknr, 1, p->buf);
 518         if (p->error_code)
 519             return BLOCK_ABORT;
 520     }
 521     else
 522         memset (p->buf, 0, param_fs->blocksize);
 523 
 524     if (p->pos + (off_t) p->count < p->current)
 525     {
 526         p->finished = TRUE;
 527         return BLOCK_ABORT;
 528     }
 529     if (p->pos > p->current + param_fs->blocksize)
 530     {
 531         p->current += param_fs->blocksize;
 532         return 0;  // we have not arrived yet
 533     }
 534 
 535     // Now, we know we have to extract some data
 536     if (p->pos >= p->current)
 537     {
 538 
 539         // First case: starting pointer inside this block
 540         if (p->pos + (off_t) p->count <= p->current + param_fs->blocksize)
 541         {
 542             // Fully contained
 543             copy_count = p->count;
 544             p->finished = (p->count != 0);
 545         }
 546         else
 547         {
 548             // Still some more data
 549             copy_count = param_fs->blocksize - (p->pos - p->current);
 550         }
 551         memcpy (p->dest_buffer, p->buf + (p->pos - p->current), copy_count);
 552     }
 553     else
 554     {
 555         // Second case: we already have passed p->pos
 556         if (p->pos + (off_t) p->count < p->current + param_fs->blocksize)
 557         {
 558             copy_count = (p->pos + p->count) - p->current;
 559             p->finished = (p->count != 0);
 560         }
 561         else
 562         {
 563             copy_count = param_fs->blocksize;
 564         }
 565         memcpy (p->dest_buffer, p->buf, copy_count);
 566     }
 567     p->dest_buffer += copy_count;
 568     p->current += param_fs->blocksize;
 569     if (p->finished)
 570     {
 571         return BLOCK_ABORT;
 572     }
 573     return 0;
 574 }
 575 
 576 /* --------------------------------------------------------------------------------------------- */
 577 
 578 static ssize_t
 579 undelfs_read (void *vfs_info, char *buffer, size_t count)
     /*   */
 580 {
 581     undelfs_file *p = vfs_info;
 582     int retval;
 583 
 584     p->dest_buffer = buffer;
 585     p->current = 0;
 586     p->finished = FALSE;
 587     p->count = count;
 588 
 589     if (p->pos + (off_t) p->count > p->size)
 590     {
 591         p->count = p->size - p->pos;
 592     }
 593     retval = ext2fs_block_iterate (fs, p->inode, 0, NULL, undelfs_dump_read, p);
 594     if (retval)
 595     {
 596         message (D_ERROR, undelfserr, "%s", _ ("while iterating over blocks"));
 597         return -1;
 598     }
 599     if (p->error_code && !p->finished)
 600         return 0;
 601     p->pos = p->pos + (p->dest_buffer - buffer);
 602     return p->dest_buffer - buffer;
 603 }
 604 
 605 /* --------------------------------------------------------------------------------------------- */
 606 
 607 static long
 608 undelfs_getindex (char *path)
     /*   */
 609 {
 610     ext2_ino_t inode = atol (path);
 611     int i;
 612 
 613     for (i = 0; i < num_delarray; i++)
 614     {
 615         if (delarray[i].ino == inode)
 616             return i;
 617     }
 618     return -1;
 619 }
 620 
 621 /* --------------------------------------------------------------------------------------------- */
 622 
 623 static int
 624 undelfs_stat_int (int inode_index, struct stat *buf)
     /*   */
 625 {
 626     buf->st_dev = 0;
 627     buf->st_ino = delarray[inode_index].ino;
 628     buf->st_mode = delarray[inode_index].mode;
 629     buf->st_nlink = 1;
 630     buf->st_uid = delarray[inode_index].uid;
 631     buf->st_gid = delarray[inode_index].gid;
 632     buf->st_size = delarray[inode_index].size;
 633 
 634     vfs_zero_stat_times (buf);
 635     buf->st_atime = delarray[inode_index].dtime;
 636     buf->st_ctime = delarray[inode_index].dtime;
 637     buf->st_mtime = delarray[inode_index].dtime;
 638 
 639     return 0;
 640 }
 641 
 642 /* --------------------------------------------------------------------------------------------- */
 643 
 644 static int
 645 undelfs_lstat (const vfs_path_t *vpath, struct stat *buf)
     /*   */
 646 {
 647     int inode_index;
 648     char *file, *f = NULL;
 649 
 650     undelfs_get_path (vpath, &file, &f);
 651     if (file == NULL)
 652     {
 653         g_free (f);
 654         return 0;
 655     }
 656 
 657     /* When called from save_cwd_stats we get an incorrect file and f here:
 658        e.g. incorrect                         correct
 659        path = "undel:/dev/sda1"          path="undel:/dev/sda1/401:1"
 660        file = "/dev"                     file="/dev/sda1"
 661        f    = "sda1"                     f   ="401:1"
 662        If the first char in f is no digit -> return error */
 663     if (!isdigit (*f))
 664     {
 665         g_free (file);
 666         g_free (f);
 667         return -1;
 668     }
 669 
 670     if (!ext2_fname || strcmp (ext2_fname, file))
 671     {
 672         g_free (file);
 673         g_free (f);
 674         message (D_ERROR, undelfserr, "%s", _ ("You have to chdir to extract files first"));
 675         return 0;
 676     }
 677     inode_index = undelfs_getindex (f);
 678     g_free (file);
 679     g_free (f);
 680 
 681     if (inode_index == -1)
 682         return -1;
 683 
 684     return undelfs_stat_int (inode_index, buf);
 685 }
 686 
 687 /* --------------------------------------------------------------------------------------------- */
 688 
 689 static int
 690 undelfs_fstat (void *vfs_info, struct stat *buf)
     /*   */
 691 {
 692     undelfs_file *p = vfs_info;
 693 
 694     return undelfs_stat_int (p->f_index, buf);
 695 }
 696 
 697 /* --------------------------------------------------------------------------------------------- */
 698 
 699 static int
 700 undelfs_chdir (const vfs_path_t *vpath)
     /*   */
 701 {
 702     char *file, *f = NULL;
 703     int fd;
 704 
 705     undelfs_get_path (vpath, &file, &f);
 706     if (file == NULL)
 707     {
 708         g_free (f);
 709         return (-1);
 710     }
 711 
 712     // We may use access because ext2 file systems are local
 713     // this could be fixed by making an ext2fs io manager to use
 714     // our vfs, but that is left as an exercise for the reader
 715     fd = open (file, O_RDONLY);
 716     if (fd == -1)
 717     {
 718         message (D_ERROR, undelfserr, _ ("Cannot open file \"%s\""), file);
 719         g_free (f);
 720         g_free (file);
 721         return -1;
 722     }
 723     close (fd);
 724     g_free (f);
 725     g_free (file);
 726     return 0;
 727 }
 728 
 729 /* --------------------------------------------------------------------------------------------- */
 730 
 731 /* this has to stay here for now: vfs layer does not know how to emulate it */
 732 static off_t
 733 undelfs_lseek (void *vfs_info, off_t offset, int whence)
     /*   */
 734 {
 735     (void) vfs_info;
 736     (void) offset;
 737     (void) whence;
 738 
 739     return -1;
 740 }
 741 
 742 /* --------------------------------------------------------------------------------------------- */
 743 
 744 static vfsid
 745 undelfs_getid (const vfs_path_t *vpath)
     /*   */
 746 {
 747     char *fname = NULL, *fsname;
 748     gboolean ok;
 749 
 750     undelfs_get_path (vpath, &fsname, &fname);
 751     ok = fsname != NULL;
 752 
 753     g_free (fname);
 754     g_free (fsname);
 755 
 756     return ok ? (vfsid) fs : NULL;
 757 }
 758 
 759 /* --------------------------------------------------------------------------------------------- */
 760 
 761 static gboolean
 762 undelfs_nothingisopen (vfsid id)
     /*   */
 763 {
 764     (void) id;
 765 
 766     return (undelfs_usage == 0);
 767 }
 768 
 769 /* --------------------------------------------------------------------------------------------- */
 770 
 771 static void
 772 undelfs_free (vfsid id)
     /*   */
 773 {
 774     (void) id;
 775 
 776     undelfs_shutdown ();
 777 }
 778 
 779 /* --------------------------------------------------------------------------------------------- */
 780 
 781 #ifdef ENABLE_NLS
 782 static int
 783 undelfs_init (struct vfs_class *me)
     /*   */
 784 {
 785     (void) me;
 786 
 787     undelfserr = _ (undelfserr);
 788     return 1;
 789 }
 790 #else
 791 #    define undelfs_init NULL
 792 #endif
 793 
 794 /* --------------------------------------------------------------------------------------------- */
 795 /*** public functions ****************************************************************************/
 796 /* --------------------------------------------------------------------------------------------- */
 797 /**
 798  * This function overrides com_err() from libcom_err library.
 799  * It is used in libext2fs to report errors.
 800  */
 801 
 802 void
 803 com_err (const char *whoami, long err_code, const char *fmt, ...)
     /*   */
 804 {
 805     va_list ap;
 806     char *str;
 807 
 808     va_start (ap, fmt);
 809     str = g_strdup_vprintf (fmt, ap);
 810     va_end (ap);
 811 
 812     message (D_ERROR, _ ("Ext2lib error"), "%s (%s: %ld)", str, whoami, err_code);
 813     g_free (str);
 814 }
 815 
 816 /* --------------------------------------------------------------------------------------------- */
 817 
 818 void
 819 vfs_init_undelfs (void)
     /*   */
 820 {
 821     // NULLize vfs_s_subclass members
 822     memset (&undelfs_subclass, 0, sizeof (undelfs_subclass));
 823 
 824     vfs_init_class (vfs_undelfs_ops, "undelfs", VFSF_UNKNOWN, "undel");
 825     vfs_undelfs_ops->init = undelfs_init;
 826     vfs_undelfs_ops->open = undelfs_open;
 827     vfs_undelfs_ops->close = undelfs_close;
 828     vfs_undelfs_ops->read = undelfs_read;
 829     vfs_undelfs_ops->opendir = undelfs_opendir;
 830     vfs_undelfs_ops->readdir = undelfs_readdir;
 831     vfs_undelfs_ops->closedir = undelfs_closedir;
 832     vfs_undelfs_ops->stat = undelfs_stat;
 833     vfs_undelfs_ops->lstat = undelfs_lstat;
 834     vfs_undelfs_ops->fstat = undelfs_fstat;
 835     vfs_undelfs_ops->chdir = undelfs_chdir;
 836     vfs_undelfs_ops->lseek = undelfs_lseek;
 837     vfs_undelfs_ops->getid = undelfs_getid;
 838     vfs_undelfs_ops->nothingisopen = undelfs_nothingisopen;
 839     vfs_undelfs_ops->free = undelfs_free;
 840     vfs_register_class (vfs_undelfs_ops);
 841 }
 842 
 843 /* --------------------------------------------------------------------------------------------- */
/* */
root/src/vfs/undelfs/undelfs.c

DEFINITIONS
