tst_inode_size.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
1/*
2 * This testing program makes sure the ext2_inode structure is 1024 bytes long
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 "config.h"
13#include <stdio.h>
14#include <unistd.h>
15#include <stdlib.h>
16
17#include "ext2_fs.h"
18
19struct ext2_inode inode;
20
21int verbose = 0;
22
23#define offsetof(type, member)  __builtin_offsetof (type, member)
24#define check_field(x) cur_offset = do_field(#x, sizeof(inode.x),	\
25				offsetof(struct ext2_inode, x), \
26				cur_offset)
27
28static int do_field(const char *field, size_t size, int offset, int cur_offset)
29{
30	if (offset != cur_offset) {
31		printf("Warning!  Unexpected offset at %s\n", field);
32		exit(1);
33	}
34	printf("%8d %-30s %3u\n", offset, field, (unsigned) size);
35	return offset + size;
36}
37
38void check_structure_fields()
39{
40#if (__GNUC__ >= 4)
41	int cur_offset = 0;
42
43	printf("%8s %-30s %3s\n", "offset", "field", "size");
44	check_field(i_mode);
45	check_field(i_uid);
46	check_field(i_size);
47	check_field(i_atime);
48	check_field(i_ctime);
49	check_field(i_mtime);
50	check_field(i_dtime);
51	check_field(i_gid);
52	check_field(i_links_count);
53	check_field(i_blocks);
54	check_field(i_flags);
55	check_field(osd1.linux1.l_i_version);
56	check_field(i_block);
57	check_field(i_generation);
58	check_field(i_file_acl);
59	check_field(i_size_high);
60	check_field(i_faddr);
61	check_field(osd2.linux2.l_i_blocks_hi);
62	check_field(osd2.linux2.l_i_file_acl_high);
63	check_field(osd2.linux2.l_i_uid_high);
64	check_field(osd2.linux2.l_i_gid_high);
65	check_field(osd2.linux2.l_i_checksum_lo);
66	check_field(osd2.linux2.l_i_reserved);
67	printf("Ending offset is %d\n\n", cur_offset);
68#endif
69}
70
71
72int main(int argc, char **argv)
73{
74	int l = sizeof(struct ext2_inode);
75
76	check_structure_fields();
77	printf("Size of struct ext2_inode is %d\n", l);
78	if (l != 128) {
79		exit(1);
80	}
81	exit(0);
82}
83