tst_fs_struct.c revision 930d7a7fb777c4558b5417ae00a4cf57b10169a2 
1/*
2 * This testing program checks the offset of the ext2_filsys structure
3 *
4 * Copyright (C) 2007 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#include <unistd.h>
14#include <stdlib.h>
15
16#include "ext2fs.h"
17
18struct struct_ext2_filsys fs;
19
20#ifndef offsetof
21#define offsetof(type, member)  __builtin_offsetof (type, member)
22#endif
23#define check_field(x) cur_offset = do_field(#x, sizeof(fs.x),		\
24					offsetof(struct struct_ext2_filsys, x), \
25					cur_offset)
26
27static int do_field(const char *field, size_t size, int offset, int cur_offset)
28{
29	if (offset != cur_offset) {
30		printf("\t(padding %d bytes?)\n", offset - cur_offset);
31	}
32	printf("%8d %-30s %3u\n", offset, field, (unsigned) size);
33	return offset + size;
34}
35
36int main(int argc, char **argv)
37{
38#if (__GNUC__ >= 4)
39	int cur_offset = 0;
40
41	printf("%8s %-30s %3s\n", "offset", "field", "size");
42	check_field(magic);
43	check_field(io);
44	check_field(flags);
45	check_field(device_name);
46	check_field(super);
47	check_field(blocksize);
48	check_field(fragsize);
49	check_field(group_desc_count);
50	check_field(desc_blocks);
51	check_field(group_desc);
52	check_field(inode_blocks_per_group);
53	check_field(inode_map);
54	check_field(block_map);
55	check_field(get_blocks);
56	check_field(check_directory);
57	check_field(write_bitmaps);
58	check_field(read_inode);
59	check_field(write_inode);
60	check_field(badblocks);
61	check_field(dblist);
62	check_field(stride);
63	check_field(orig_super);
64	check_field(image_header);
65	check_field(umask);
66	check_field(now);
67	check_field(cluster_ratio_bits);
68	check_field(reserved);
69	check_field(priv_data);
70	check_field(icache);
71	check_field(image_io);
72	check_field(get_alloc_block);
73	check_field(block_alloc_stats);
74	check_field(mmp_buf);
75	check_field(mmp_cmp);
76	check_field(mmp_fd);
77	check_field(mmp_last_written);
78	printf("Ending offset is %d\n\n", cur_offset);
79#endif
80	exit(0);
81}
82