lib/ext2fs/tst_super_size.c

   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_cluster_size);
  54         check_field(s_blocks_per_group);
  55         check_field(s_clusters_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_usr_quota_inum);
 127         check_field(s_grp_quota_inum);
 128         check_field(s_reserved);
 129         printf("Ending offset is %d\n\n", cur_offset);
 130 #endif
 131 }
 132
 133
 134 int main(int argc, char **argv)
 135 {
 136         int s = sizeof(struct sb_struct);
 137
 138         check_superblock_fields();
 139         printf("Size of struct %s is %d\n", sb_struct_name, s);
 140         if (s != 1024) {
 141                 exit(1);
 142         }
 143         exit(0);
 144 }