tst_inode_size.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
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 <stdio.h>
13#include <unistd.h>
14#include <stdlib.h>
15
16#include "ext2_fs.h"
17
18struct ext2_inode_large inode;
19
20#ifndef offsetof
21#define offsetof(type, member)  __builtin_offsetof(type, member)
22#endif
23
24#define check_field(x, s) cur_offset = do_field(#x, s, sizeof(inode.x),	       \
25					offsetof(struct ext2_inode_large, x),  \
26					cur_offset)
27
28static int do_field(const char *field, unsigned size, unsigned cur_size,
29		    unsigned offset, unsigned cur_offset)
30{
31	if (size != cur_size) {
32		printf("error: %s size %u should be %u\n",
33		       field, cur_size, size);
34		exit(1);
35	}
36	if (offset != cur_offset) {
37		printf("error: %s offset %u should be %u\n",
38		       field, cur_offset, offset);
39		exit(1);
40	}
41	printf("%8d %-30s %3u\n", offset, field, (unsigned) size);
42	return offset + size;
43}
44
45int main(int argc, char **argv)
46{
47#if (__GNUC__ >= 4)
48	int cur_offset = 0;
49
50	printf("%8s %-30s %3s\n", "offset", "field", "size");
51	check_field(i_mode, 2);
52	check_field(i_uid, 2);
53	check_field(i_size, 4);
54	check_field(i_atime, 4);
55	check_field(i_ctime, 4);
56	check_field(i_mtime, 4);
57	check_field(i_dtime, 4);
58	check_field(i_gid, 2);
59	check_field(i_links_count, 2);
60	check_field(i_blocks, 4);
61	check_field(i_flags, 4);
62	check_field(osd1.linux1.l_i_version, 4);
63	check_field(i_block, 15 * 4);
64	check_field(i_generation, 4);
65	check_field(i_file_acl, 4);
66	check_field(i_size_high, 4);
67	check_field(i_faddr, 4);
68	check_field(osd2.linux2.l_i_blocks_hi, 2);
69	check_field(osd2.linux2.l_i_file_acl_high, 2);
70	check_field(osd2.linux2.l_i_uid_high, 2);
71	check_field(osd2.linux2.l_i_gid_high, 2);
72	check_field(osd2.linux2.l_i_checksum_lo, 2);
73	check_field(osd2.linux2.l_i_reserved, 2);
74	do_field("Small inode end", 0, 0, cur_offset, 128);
75	check_field(i_extra_isize, 2);
76	check_field(i_checksum_hi, 2);
77	check_field(i_ctime_extra, 4);
78	check_field(i_mtime_extra, 4);
79	check_field(i_atime_extra, 4);
80	check_field(i_crtime, 4);
81	check_field(i_crtime_extra, 4);
82	check_field(i_version_hi, 4);
83	/* This size will change as new fields are added */
84	do_field("Large inode end", 0, 0, cur_offset, sizeof(inode));
85#endif
86	return 0;
87}
88