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 Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include "config.h"
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	fs->mmp_buf = 0;
44	fs->mmp_cmp = 0;
45	fs->mmp_fd = -1;
46
47	io_channel_bumpcount(fs->io);
48	if (fs->icache)
49		fs->icache->refcount++;
50
51	retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
52	if (retval)
53		goto errout;
54	strcpy(fs->device_name, src->device_name);
55
56	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
57	if (retval)
58		goto errout;
59	memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
60
61	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
62	if (retval)
63		goto errout;
64	memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
65
66	retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
67				&fs->group_desc);
68	if (retval)
69		goto errout;
70	memcpy(fs->group_desc, src->group_desc,
71	       (size_t) fs->desc_blocks * fs->blocksize);
72
73	if (src->inode_map) {
74		retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
75		if (retval)
76			goto errout;
77	}
78	if (src->block_map) {
79		retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
80		if (retval)
81			goto errout;
82	}
83	if (src->badblocks) {
84		retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
85		if (retval)
86			goto errout;
87	}
88	if (src->dblist) {
89		retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
90		if (retval)
91			goto errout;
92	}
93	if (src->mmp_buf) {
94		retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
95		if (retval)
96			goto errout;
97		memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
98	}
99	if (src->mmp_fd >= 0) {
100		fs->mmp_fd = dup(src->mmp_fd);
101		if (fs->mmp_fd < 0) {
102			retval = EXT2_ET_MMP_OPEN_DIRECT;
103			goto errout;
104		}
105	}
106	if (src->mmp_cmp) {
107		int align = ext2fs_get_dio_alignment(src->mmp_fd);
108
109		retval = ext2fs_get_memalign(src->blocksize, align,
110					     &fs->mmp_cmp);
111		if (retval)
112			goto errout;
113		memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
114	}
115	*dest = fs;
116	return 0;
117errout:
118	ext2fs_free(fs);
119	return retval;
120
121}
122
123