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

[Shuang Qiu <shuang.qiu@oracle.com>]

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.

Thanks
Shuang

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