[LTP] [PATCH v2 1/2] preadv/preadv03.c: Add new testcase

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

On 2018/04/06 21:02, Cyril Hrubis wrote:
> Hi!
>> +static void setup(void)
>> +{
>> +	pgsz = getpagesize();
>> +	tst_off1 = pgsz;
>> +	tst_off2 = pgsz * 3 / 2;
>> +	exp_sz1 = pgsz;
>> +	exp_sz2 = pgsz / 2;
>> +
>> +	fd = SAFE_OPEN(FNAME, O_RDWR | O_CREAT | O_DIRECT, 0644);
>> +
>> +	pop_buf = SAFE_MEMALIGN(pgsz, pgsz);
>> +	memset(pop_buf, 0x61, pgsz);
>> +	SAFE_WRITE(1, fd, pop_buf, pgsz);
>> +
>> +	memset(pop_buf, 0x62, pgsz);
>> +	SAFE_WRITE(1, fd, pop_buf, pgsz);
>> +
>> +	rd_iovec = SAFE_MEMALIGN(pgsz, pgsz + sizeof(size_t));
>> +	rd_iovec->iov_base = SAFE_MEMALIGN(pgsz, pgsz);
>> +	rd_iovec->iov_len = pgsz;
> The open(2) manual page says that O_DIRECT buffers should be aligned to
> disk block size which can be queried by BLKSSZGET ioctl(). And I suppose
> that the offsets should be multiple of the disk block size as well.
Hi Cyril,

OK, i will replace page size with block size as you suggested.

Thanks,
Xiao Yang
>> +}
>> +
>> +static void cleanup(void)
>> +{
>> +	free(pop_buf);
>> +	free(rd_iovec->iov_base);
>> +	free(rd_iovec);
>> +
>> +	if (fd>  0)
>> +		SAFE_CLOSE(fd);
>> +}