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 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 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
