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
18 struct 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
do_field(const char * field,size_t size,int offset,int cur_offset)27 static 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
main(int argc,char ** argv)36 int 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