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 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 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 } 130 131 132 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
