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
ext2fs_dup_handle(ext2_filsys src,ext2_filsys * dest)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 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;
117 errout:
118 ext2fs_free(fs);
119 return retval;
120
121 }
122
123