1 /*
2 * This testing program makes sure superblock size 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
18 #define sb_struct ext2_super_block
19 #define sb_struct_name "ext2_super_block"
20
21 struct sb_struct sb;
22
23 int verbose = 0;
24
25 #define offsetof(type, member) __builtin_offsetof (type, member)
26 #define check_field(x) cur_offset = do_field(#x, sizeof(sb.x), \
27 offsetof(struct sb_struct, x), \
28 cur_offset)
29
do_field(const char * field,size_t size,int offset,int cur_offset)30 static int do_field(const char *field, size_t size, int offset, int cur_offset)
31 {
32 if (offset != cur_offset) {
33 printf("Warning! Unexpected offset at %s\n", field);
34 exit(1);
35 }
36 printf("%8d %-30s %3u\n", offset, field, (unsigned) size);
37 return offset + size;
38 }
39
check_superblock_fields()40 void check_superblock_fields()
41 {
42 #if (__GNUC__ >= 4)
43 int cur_offset = 0;
44
45 printf("%8s %-30s %3s\n", "offset", "field", "size");
46 check_field(s_inodes_count);
47 check_field(s_blocks_count);
48 check_field(s_r_blocks_count);
49 check_field(s_free_blocks_count);
50 check_field(s_free_inodes_count);
51 check_field(s_first_data_block);
52 check_field(s_log_block_size);
53 check_field(s_log_frag_size);
54 check_field(s_blocks_per_group);
55 check_field(s_frags_per_group);
56 check_field(s_inodes_per_group);
57 check_field(s_mtime);
58 check_field(s_wtime);
59 check_field(s_mnt_count);
60 check_field(s_max_mnt_count);
61 check_field(s_magic);
62 check_field(s_state);
63 check_field(s_errors);
64 check_field(s_minor_rev_level);
65 check_field(s_lastcheck);
66 check_field(s_checkinterval);
67 check_field(s_creator_os);
68 check_field(s_rev_level);
69 check_field(s_def_resuid);
70 check_field(s_def_resgid);
71 check_field(s_first_ino);
72 check_field(s_inode_size);
73 check_field(s_block_group_nr);
74 check_field(s_feature_compat);
75 check_field(s_feature_incompat);
76 check_field(s_feature_ro_compat);
77 check_field(s_uuid);
78 check_field(s_volume_name);
79 check_field(s_last_mounted);
80 check_field(s_algorithm_usage_bitmap);
81 check_field(s_prealloc_blocks);
82 check_field(s_prealloc_dir_blocks);
83 check_field(s_reserved_gdt_blocks);
84 check_field(s_journal_uuid);
85 check_field(s_journal_inum);
86 check_field(s_journal_dev);
87 check_field(s_last_orphan);
88 check_field(s_hash_seed);
89 check_field(s_def_hash_version);
90 check_field(s_jnl_backup_type);
91 check_field(s_desc_size);
92 check_field(s_default_mount_opts);
93 check_field(s_first_meta_bg);
94 check_field(s_mkfs_time);
95 check_field(s_jnl_blocks);
96 check_field(s_blocks_count_hi);
97 check_field(s_r_blocks_count_hi);
98 check_field(s_free_blocks_hi);
99 check_field(s_min_extra_isize);
100 check_field(s_want_extra_isize);
101 check_field(s_flags);
102 check_field(s_raid_stride);
103 check_field(s_mmp_interval);
104 check_field(s_mmp_block);
105 check_field(s_raid_stripe_width);
106 check_field(s_log_groups_per_flex);
107 check_field(s_reserved_char_pad);
108 check_field(s_reserved_pad);
109 check_field(s_kbytes_written);
110 check_field(s_snapshot_inum);
111 check_field(s_snapshot_id);
112 check_field(s_snapshot_r_blocks_count);
113 check_field(s_snapshot_list);
114 check_field(s_error_count);
115 check_field(s_first_error_time);
116 check_field(s_first_error_ino);
117 check_field(s_first_error_block);
118 check_field(s_first_error_func);
119 check_field(s_first_error_line);
120 check_field(s_last_error_time);
121 check_field(s_last_error_ino);
122 check_field(s_last_error_line);
123 check_field(s_last_error_block);
124 check_field(s_last_error_func);
125 check_field(s_mount_opts);
126 check_field(s_reserved);
127 printf("Ending offset is %d\n\n", cur_offset);
128 #endif
129 }
130
131
main(int argc,char ** argv)132 int main(int argc, char **argv)
133 {
134 int s = sizeof(struct sb_struct);
135
136 check_superblock_fields();
137 printf("Size of struct %s is %d\n", sb_struct_name, s);
138 if (s != 1024) {
139 exit(1);
140 }
141 exit(0);
142 }
143