release/src/router/busybox/e2fsprogs/old_e2fsprogs/ext2fs/dupfs.c

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