tst_inode_size.c revision 963d0f1a9458396c18d0aa030601f29cc1e25f30 
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_large inode;
20
21#define offsetof(type, member)  __builtin_offsetof(type, member)
22#define check_field(x, s) cur_offset = do_field(#x, s, sizeof(inode.x),	       \
23					offsetof(struct ext2_inode_large, x),  \
24					cur_offset)
25
26static int do_field(const char *field, unsigned size, unsigned cur_size,
27		    unsigned offset, unsigned cur_offset)
28{
29	if (size != cur_size) {
30		printf("error: %s size %u should be %u\n",
31		       field, cur_size, size);
32		exit(1);
33	}
34	if (offset != cur_offset) {
35		printf("error: %s offset %u should be %u\n",
36		       field, cur_offset, offset);
37		exit(1);
38	}
39	printf("%8d %-30s %3u\n", offset, field, (unsigned) size);
40	return offset + size;
41}
42
43int main(int argc, char **argv)
44{
45#if (__GNUC__ >= 4)
46	int cur_offset = 0;
47
48	printf("%8s %-30s %3s\n", "offset", "field", "size");
49	check_field(i_mode, 2);
50	check_field(i_uid, 2);
51	check_field(i_size, 4);
52	check_field(i_atime, 4);
53	check_field(i_ctime, 4);
54	check_field(i_mtime, 4);
55	check_field(i_dtime, 4);
56	check_field(i_gid, 2);
57	check_field(i_links_count, 2);
58	check_field(i_blocks, 4);
59	check_field(i_flags, 4);
60	check_field(osd1.linux1.l_i_version, 4);
61	check_field(i_block, 15 * 4);
62	check_field(i_generation, 4);
63	check_field(i_file_acl, 4);
64	check_field(i_size_high, 4);
65	check_field(i_faddr, 4);
66	check_field(osd2.linux2.l_i_blocks_hi, 2);
67	check_field(osd2.linux2.l_i_file_acl_high, 2);
68	check_field(osd2.linux2.l_i_uid_high, 2);
69	check_field(osd2.linux2.l_i_gid_high, 2);
70	check_field(osd2.linux2.l_i_checksum_lo, 2);
71	check_field(osd2.linux2.l_i_reserved, 2);
72	do_field("Small inode end", 0, 0, cur_offset, 128);
73	check_field(i_extra_isize, 2);
74	check_field(i_checksum_hi, 2);
75	check_field(i_ctime_extra, 4);
76	check_field(i_mtime_extra, 4);
77	check_field(i_atime_extra, 4);
78	check_field(i_crtime, 4);
79	check_field(i_crtime_extra, 4);
80	check_field(i_version_hi, 4);
81	/* This size will change as new fields are added */
82	do_field("Large inode end", 0, 0, cur_offset, sizeof(inode));
83#endif
84	return 0;
85}
86