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
ext2fs_dup_handle(ext2_filsys src,ext2_filsys * dest)22 errcode_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;
116 errout:
117 ext2fs_free(fs);
118 return retval;
119
120 }
121
122