dupfs.c revision c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4e 
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 <time.h>
17#include <string.h>
18
19#include "ext2_fs.h"
20#include "ext2fsP.h"
21
22errcode_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->group_desc = 0;
37	fs->inode_map = 0;
38	fs->block_map = 0;
39	fs->badblocks = 0;
40	fs->dblist = 0;
41
42	io_channel_bumpcount(fs->io);
43	if (fs->icache)
44		fs->icache->refcount++;
45
46	retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
47	if (retval)
48		goto errout;
49	strcpy(fs->device_name, src->device_name);
50
51	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
52	if (retval)
53		goto errout;
54	memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
55
56	retval = ext2fs_get_mem((size_t) fs->desc_blocks * fs->blocksize,
57				&fs->group_desc);
58	if (retval)
59		goto errout;
60	memcpy(fs->group_desc, src->group_desc,
61	       (size_t) fs->desc_blocks * fs->blocksize);
62
63	if (src->inode_map) {
64		retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
65		if (retval)
66			goto errout;
67	}
68	if (src->block_map) {
69		retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
70		if (retval)
71			goto errout;
72	}
73	if (src->badblocks) {
74		retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
75		if (retval)
76			goto errout;
77	}
78	if (src->dblist) {
79		retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
80		if (retval)
81			goto errout;
82	}
83	*dest = fs;
84	return 0;
85errout:
86	ext2fs_free(fs);
87	return retval;
88
89}
90
91