C++ (Cpp) jbd2_revoke_block_csum_verifyの例

コード例 #1

ファイル: recovery.c プロジェクト: weicao/e2fsprogs

static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
			       tid_t sequence, struct recovery_info *info)
{
	journal_revoke_header_t *header;
	int offset, max;
	int record_len = 4;

	header = (journal_revoke_header_t *) bh->b_data;
	offset = sizeof(journal_revoke_header_t);
	max = be32_to_cpu(header->r_count);

	if (!jbd2_revoke_block_csum_verify(journal, header))
		return -EINVAL;

	if (JFS_HAS_INCOMPAT_FEATURE(journal, JFS_FEATURE_INCOMPAT_64BIT))
		record_len = 8;

	while (offset < max) {
		unsigned long long blocknr;
		int err;

		if (record_len == 4)
			blocknr = ext2fs_be32_to_cpu(*((__be32 *)(bh->b_data +
								  offset)));
		else
			blocknr = ext2fs_be64_to_cpu(*((__be64 *)(bh->b_data +
								  offset)));
		offset += record_len;
		err = journal_set_revoke(journal, blocknr, sequence);
		if (err)
			return err;
		++info->nr_revokes;
	}
	return 0;
}

コード例 #2

ファイル: recovery.c プロジェクト: bagana/e2fsprogs

static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
			       tid_t sequence, struct recovery_info *info)
{
	journal_revoke_header_t *header;
	int offset, max;
	int csum_size = 0;
	__u32 rcount;
	int record_len = 4;

	header = (journal_revoke_header_t *) bh->b_data;
	offset = sizeof(journal_revoke_header_t);
	rcount = ext2fs_be32_to_cpu(header->r_count);

	if (!jbd2_revoke_block_csum_verify(journal, header))
		return -EFSBADCRC;

	if (journal_has_csum_v2or3(journal))
		csum_size = sizeof(struct journal_revoke_tail);
	if (rcount > journal->j_blocksize - csum_size)
		return -EINVAL;
	max = rcount;

	if (jfs_has_feature_64bit(journal))
		record_len = 8;

	while (offset + record_len <= max) {
		unsigned long long blocknr;
		int err;

		if (record_len == 4)
			blocknr = ext2fs_be32_to_cpu(* ((__u32 *) (bh->b_data+offset)));
		else
			blocknr = ext2fs_be64_to_cpu(* ((__u64 *) (bh->b_data+offset)));
		offset += record_len;
		err = journal_set_revoke(journal, blocknr, sequence);
		if (err)
			return err;
		++info->nr_revokes;
	}
	return 0;
}