dupfs.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
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 <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->orig_super = 0;
37	fs->group_desc = 0;
38	fs->inode_map = 0;
39	fs->block_map = 0;
40	fs->badblocks = 0;
41	fs->dblist = 0;
42	fs->mmp_buf = 0;
43	fs->mmp_cmp = 0;
44	fs->mmp_fd = -1;
45
46	io_channel_bumpcount(fs->io);
47	if (fs->icache)
48		fs->icache->refcount++;
49
50	retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
51	if (retval)
52		goto errout;
53	strcpy(fs->device_name, src->device_name);
54
55	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
56	if (retval)
57		goto errout;
58	memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
59
60	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
61	if (retval)
62		goto errout;
63	memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
64
65	retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
66				&fs->group_desc);
67	if (retval)
68		goto errout;
69	memcpy(fs->group_desc, src->group_desc,
70	       (size_t) fs->desc_blocks * fs->blocksize);
71
72	if (src->inode_map) {
73		retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
74		if (retval)
75			goto errout;
76	}
77	if (src->block_map) {
78		retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
79		if (retval)
80			goto errout;
81	}
82	if (src->badblocks) {
83		retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
84		if (retval)
85			goto errout;
86	}
87	if (src->dblist) {
88		retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
89		if (retval)
90			goto errout;
91	}
92	if (src->mmp_buf) {
93		retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
94		if (retval)
95			goto errout;
96		memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
97	}
98	if (src->mmp_fd >= 0) {
99		fs->mmp_fd = dup(src->mmp_fd);
100		if (fs->mmp_fd < 0) {
101			retval = EXT2_ET_MMP_OPEN_DIRECT;
102			goto errout;
103		}
104	}
105	if (src->mmp_cmp) {
106		int align = ext2fs_get_dio_alignment(src->mmp_fd);
107
108		retval = ext2fs_get_memalign(src->blocksize, align,
109					     &fs->mmp_cmp);
110		if (retval)
111			goto errout;
112		memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
113	}
114	*dest = fs;
115	return 0;
116errout:
117	ext2fs_free(fs);
118	return retval;
119
120}
121
122