lib/ext2fs/dupfs.c

   1 /*
   2  * dupfs.c --- duplicate a ext2 filesystem handle
   3  *
   4  * Copyright (C) 1997, 1998, 2001, 2003, 2005 by Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Public
   8  * License.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #if HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16 #include <time.h>
  17 #include <string.h>
  18
  19 #include "ext2_fs.h"
  20 #include "ext2fsP.h"
  21
  22 errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
  23 {
  24         ext2_filsys     fs;
  25         errcode_t       retval;
  26
  27         EXT2_CHECK_MAGIC(src, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  28
  29         retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
  30         if (retval)
  31                 return retval;
  32
  33         *fs = *src;
  34         fs->device_name = 0;
  35         fs->super = 0;
  36         fs->orig_super = 0;
  37         fs->group_desc = 0;
  38         fs->inode_map = 0;
  39         fs->block_map = 0;
  40         fs->badblocks = 0;
  41         fs->dblist = 0;
  42
  43         io_channel_bumpcount(fs->io);
  44         if (fs->icache)
  45                 fs->icache->refcount++;
  46
  47         retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
  48         if (retval)
  49                 goto errout;
  50         strcpy(fs->device_name, src->device_name);
  51
  52         retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
  53         if (retval)
  54                 goto errout;
  55         memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
  56
  57         retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
  58         if (retval)
  59                 goto errout;
  60         memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
  61
  62         retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
  63                                 &fs->group_desc);
  64         if (retval)
  65                 goto errout;
  66         memcpy(fs->group_desc, src->group_desc,
  67                (size_t) fs->desc_blocks * fs->blocksize);
  68
  69         if (src->inode_map) {
  70                 retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
  71                 if (retval)
  72                         goto errout;
  73         }
  74         if (src->block_map) {
  75                 retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
  76                 if (retval)
  77                         goto errout;
  78         }
  79         if (src->badblocks) {
  80                 retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
  81                 if (retval)
  82                         goto errout;
  83         }
  84         if (src->dblist) {
  85                 retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
  86                 if (retval)
  87                         goto errout;
  88         }
  89         *dest = fs;
  90         return 0;
  91 errout:
  92         ext2fs_free(fs);
  93         return retval;
  94
  95 }
  96