Re: [LTP] [PATCH v3] linkat/linkat02.c: add new error number tests

[Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>]

Hi,

On 05/06/2014 04:54 PM, Shuang Qiu wrote:
> Hello,
> On 02/25/2014 02:26 PM, Zeng Linggang wrote:
>> +
>> +	SAFE_TOUCH(cleanup, TEST_EMLINK, 0666, NULL);
>> +
>> +	while (1) {
>> +		sprintf(lname, "%s%ld", BASENAME, ++link_max);
>> +		TEST(link(TEST_EMLINK, lname));
>> +		if (TEST_RETURN == -1) {
>> +			switch (TEST_ERRNO) {
>> +			case EMLINK:
>> +				tst_resm(TINFO, "for %s the max links is %ld",
>> +					 fstype, link_max);
>> +				break;
>> +			default:
>> +				tst_brkm(TBROK | TTERRNO, cleanup,
>> +					 "Unexpected error: ");
>> +				break;
>> +			}
>> +			break;
>> +		}
>> +	}
>> +}
>>
> Should it give a limit max number here when test EMLINK to handler the 
> filesystems which unlimited link count.
> AFAIK,it use 2^31 - 1 with xfs:
> /*
>   * The 32 bit link count in the inode theoretically maxes out at UINT_MAX.
>   * Since the pathconf interface is signed, we use 2^31 - 1 instead.
>   * The old inode format had a 16 bit link count, so its maximum is 
> USHRT_MAX.
>   */
> #define XFS_MAXLINK             ((1U << 31) - 1U)
> #define XFS_MAXLINK_1           65535U
>
> We are not able to reach such limitation.

Yeah, I think so.
Or we should make the file system hard coded to ext2/3/4.

Regards,
Xiaoguang Wang
>
> Thanks
> Shuang
>
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