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SubjectRe: sysfs regression: wrong link counts
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

>> Isn't there some other "proper" way of doing this in userspace, or is
>> this really the correct way?
>
> You can look at the S_IFMT bits and stuff however link count indicating
> number of subdirectories is a standard Unix thing and used by many quite
> mundane tools as an optimisation.

Those tools for a decade or better all know to treat nlink == 1 as the
case where the optimization does not apply.

On a traditional unix filesytem the most common place you will see nlink
== 1 is when the link count overflows. extN with > 65536 subdirectories
as I recall.

Eric


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