mirror of https://github.com/vitalif/e2fsprogs
134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/*
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* This testing program verifies checksumming operations
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*
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* Copyright (C) 2006, 2007 by Andreas Dilger <adilger@clusterfs.com>
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU General Public
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* License, Version 2. See the file COPYING for more details.
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* %End-Header%
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*/
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ext2fs/ext2_fs.h"
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#include "ext2fs/ext2fs.h"
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#include "ext2fs/crc16.h"
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#ifndef offsetof
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#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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#endif
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void print_csum(const char *msg, ext2_filsys fs, dgrp_t group)
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{
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__u16 crc1, crc2, crc3;
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dgrp_t swabgroup;
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struct ext2_group_desc *desc = &fs->group_desc[group];
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struct ext2_super_block *sb = fs->super;
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#ifdef WORDS_BIGENDIAN
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struct ext2_group_desc swabdesc = fs->group_desc[group];
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/* Have to swab back to little-endian to do the checksum */
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ext2fs_swap_group_desc(&swabdesc);
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desc = &swabdesc;
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swabgroup = ext2fs_swab32(group);
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#else
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swabgroup = group;
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#endif
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crc1 = ext2fs_crc16(~0, sb->s_uuid, sizeof(fs->super->s_uuid));
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crc2 = ext2fs_crc16(crc1, &swabgroup, sizeof(swabgroup));
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crc3 = ext2fs_crc16(crc2, desc,
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offsetof(struct ext2_group_desc, bg_checksum));
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printf("%s: UUID %016Lx%016Lx(%04x), grp %u(%04x): %04x=%04x\n",
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msg, *(long long *)&sb->s_uuid, *(long long *)&sb->s_uuid[8],
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crc1, group, crc2, crc3, ext2fs_group_desc_csum(fs, group));
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}
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unsigned char sb_uuid[16] = { 0x4f, 0x25, 0xe8, 0xcf, 0xe7, 0x97, 0x48, 0x23,
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0xbe, 0xfa, 0xa7, 0x88, 0x4b, 0xae, 0xec, 0xdb };
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int main(int argc, char **argv)
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{
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struct ext2_super_block param;
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errcode_t retval;
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ext2_filsys fs;
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int i;
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__u16 csum1, csum2, csum_known = 0xd3a4;
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memset(¶m, 0, sizeof(param));
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param.s_blocks_count = 32768;
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retval = ext2fs_initialize("test fs", 0, ¶m,
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test_io_manager, &fs);
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if (retval) {
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com_err("setup", retval,
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"While initializing filesystem");
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exit(1);
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}
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memcpy(fs->super->s_uuid, sb_uuid, 16);
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fs->super->s_feature_ro_compat = EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
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for (i=0; i < fs->group_desc_count; i++) {
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fs->group_desc[i].bg_block_bitmap = 124;
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fs->group_desc[i].bg_inode_bitmap = 125;
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fs->group_desc[i].bg_inode_table = 126;
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fs->group_desc[i].bg_free_blocks_count = 31119;
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fs->group_desc[i].bg_free_inodes_count = 15701;
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fs->group_desc[i].bg_used_dirs_count = 2;
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fs->group_desc[i].bg_flags = 0;
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};
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csum1 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum0000", fs, 0);
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if (csum1 != csum_known) {
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printf("checksum for group 0 should be %04x\n", csum_known);
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exit(1);
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}
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csum2 = ext2fs_group_desc_csum(fs, 1);
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print_csum("csum0001", fs, 1);
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if (csum1 == csum2) {
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printf("checksums for different groups shouldn't match\n");
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exit(1);
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}
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csum2 = ext2fs_group_desc_csum(fs, 2);
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print_csum("csumffff", fs, 2);
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if (csum1 == csum2) {
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printf("checksums for different groups shouldn't match\n");
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exit(1);
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}
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fs->group_desc[0].bg_checksum = csum1;
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csum2 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum_set", fs, 0);
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if (csum1 != csum2) {
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printf("checksums should not depend on checksum field\n");
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exit(1);
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}
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if (!ext2fs_group_desc_csum_verify(fs, 0)) {
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printf("checksums should verify against gd_checksum\n");
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exit(1);
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}
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memset(fs->super->s_uuid, 0x30, sizeof(fs->super->s_uuid));
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print_csum("new_uuid", fs, 0);
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if (ext2fs_group_desc_csum_verify(fs, 0) != 0) {
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printf("checksums for different filesystems shouldn't match\n");
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exit(1);
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}
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csum1 = fs->group_desc[0].bg_checksum = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum_new", fs, 0);
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fs->group_desc[0].bg_free_blocks_count = 1;
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csum2 = ext2fs_group_desc_csum(fs, 0);
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print_csum("csum_blk", fs, 0);
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if (csum1 == csum2) {
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printf("checksums for different data shouldn't match\n");
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exit(1);
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}
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return 0;
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}
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