[LTP] [PATCH v2] block/ltp_block_dev.c: Update tests for the newer kernel

[Xiao Yang]

On 2019/02/08 19:48, Petr Vorel wrote:
> Hi Xiao,
>
>> The maximum major number is set to 511 since kernel commit 133d55c,
>> so register_blkdev() with a major number grater than the maximum(511)
>> will get failure instead of pass as expected.
>> 1) Update tests for the newer behavior of register_blkdev().
>> 2) Add more major numbers(i.e. 511 and 512) to test.
>> Note:
>> It is possible that specified major numbers have been used
>> by system, so we skip them if register_blkdev() returns EBUSY.
>> Signed-off-by: Xiao Yang<yangx.jy@cn.fujitsu.com>
>> Reviewed-by: Petr Vorel<pvorel@suse.cz>
> Acked-by: Petr Vorel<pvorel@suse.cz>
> Thanks for your updates.
>
>> ---
>>   .../block/block_dev_kernel/ltp_block_dev.c         | 64 +++++++++++-----------
>>   1 file changed, 32 insertions(+), 32 deletions(-)
>> diff --git a/testcases/kernel/device-drivers/block/block_dev_kernel/ltp_block_dev.c b/testcases/kernel/device-drivers/block/block_dev_kernel/ltp_block_dev.c
> ...
>> @@ -225,18 +221,22 @@ static int tc04(void)
>>   static int tc05(void)
> ...
>
>> -	major = register_blkdev(UINT_MAX, BLK_DEV_NAME);
>> -	prk_debug("major = %i\n", major);
>> +	for (i = 0; i<  sizeof(test_major) / sizeof(unsigned int); i++) {
>> +		major = register_blkdev(test_major[i], BLK_DEV_NAME);
>> +		prk_debug("major = %i\n", major);
>> -	if (major == 0) {
>> -		unregister_blkdev(UINT_MAX, BLK_DEV_NAME);
>> -	} else {
>> -		prk_debug("reg blkdev with major %d failed with error %i\n",
>> -			UINT_MAX, major);
>> -		pass = 0;
>> +		if (major == 0) {
> In v1 this was major>= 0.
> It looks to me as well that major == 0 is correct.
Hi Petr,

Thanks for your ack. :-)

According to the comment of register_blkdev() at block/genhd.c in 
kernel,  i think register_blkdev() only
returns zero or a negative error if a positive major number(i.e. 
nonzero) is passed to register_blkdev().
---------------------------------------------------------------------------------------------------------------------------------

||

  *  - if a major device number was requested in range [1..BLKDEV_MAJOR_MAX-1]
  *    then the function returns zero on success, or a negative error code
  *  - if any unused major number was requested with @major = 0 parameter
  *    then the return value is the allocated major number in range
  *    [1..BLKDEV_MAJOR_MAX-1] or a negative error code otherwise

---------------------------------------------------------------------------------------------------------------------------------

So i perfer to use major == 0. :-)

Best Regards,
Xiao Yang
>> +			unregister_blkdev(test_major[i], BLK_DEV_NAME);
>> +			pass = 0;
>> +		} else {
>> +			prk_debug("register_blkdev() with major %u got error %i\n",
>> +				  test_major[i], major);
>> +		}
>>   	}
>>   	prk_info("Test Case Result: %s\n", result_str(pass));
>
> Kind regards,
> Petr
>
>
> .
>



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