lib/ext2fs/dupfs.c

   1 /*
   2  * dupfs.c --- duplicate a ext2 filesystem handle
   3  *
   4  * Copyright (C) 1997 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 <stdlib.h>
  17 #include <time.h>
  18 #include <string.h>
  19 #ifdef HAVE_ERRNO_H
  20 #include <errno.h>
  21 #endif
  22
  23 #include <linux/ext2_fs.h>
  24
  25 #include "ext2fsP.h"
  26
  27 errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
  28 {
  29         ext2_filsys     fs;
  30         errcode_t       retval;
  31
  32         EXT2_CHECK_MAGIC(src, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  33
  34         fs = (ext2_filsys) malloc(sizeof(struct struct_ext2_filsys));
  35         if (!fs)
  36                 return ENOMEM;
  37
  38         *fs = *src;
  39         fs->device_name = 0;
  40         fs->super = 0;
  41         fs->group_desc = 0;
  42         fs->inode_map = 0;
  43         fs->block_map = 0;
  44         fs->badblocks = 0;
  45         fs->dblist = 0;
  46
  47         io_channel_bumpcount(fs->io);
  48         if (fs->icache)
  49                 fs->icache->refcount++;
  50
  51         retval = ENOMEM;
  52         fs->device_name = malloc(strlen(src->device_name)+1);
  53         if (!fs->device_name)
  54                 goto errout;
  55         strcpy(fs->device_name, src->device_name);
  56
  57         fs->super = malloc(SUPERBLOCK_SIZE);
  58         if (!fs->super)
  59                 goto errout;
  60         memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
  61
  62         fs->group_desc = malloc(fs->desc_blocks * fs->blocksize);
  63         if (!fs->group_desc)
  64                 goto errout;
  65         memcpy(fs->group_desc, src->group_desc,
  66                fs->desc_blocks * fs->blocksize);
  67
  68         if (src->inode_map) {
  69                 retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
  70                 if (retval)
  71                         goto errout;
  72         }
  73         if (src->block_map) {
  74                 retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
  75                 if (retval)
  76                         goto errout;
  77         }
  78         if (src->badblocks) {
  79                 retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
  80                 if (retval)
  81                         goto errout;
  82         }
  83         if (src->dblist) {
  84                 retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
  85                 if (retval)
  86                         goto errout;
  87         }
  88         *dest = fs;
  89         return 0;
  90 errout:
  91         ext2fs_free(fs);
  92         return retval;
  93
  94 }
  95