LXR 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
  23errcode_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;
  92errout:
  93        ext2fs_free(fs);
  94        return retval;
  95}
  96