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Subject: Re: Hard linking symlink does not work
To:     "J. Bruce Fields" <bfields@fieldses.org>,
        Vasyl Vavrychuk <vvavrychuk@gmail.com>
Cc:     linux-nfs@vger.kernel.org
References: <CAGj4m+5rpNqW=XnU2cxGmWiBi47w3XTvn9EGekVPjq74pHfFGA@mail.gmail.com>
 <20201027171240.GA1644@fieldses.org>
From:   Patrick Goetz <pgoetz@math.utexas.edu>
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On 10/27/20 12:12 PM, J. Bruce Fields wrote:
> On Fri, Oct 23, 2020 at 01:13:02PM +0300, Vasyl Vavrychuk wrote:
>> I have found that hard links for regular files works well for me over NFS:
>>
>> $ touch bar
>> $ ln bar tata
>>
>> But if I try to make hard link for symlink, then it fails:
>>
>> $ ln -s foo bar
>> $ ln bar tata
>> ln: failed to create hard link 'tata' => 'bar': Operation not permitted
> 
> Huh.  I'm not sure I even realized it was possible to hardlink symlinks.
> Makes sense, I guess.

What's even the use case for hard linking a symlink?  That sounds like 
asking for trouble...


> 
> I think my first step debugging this would be to watch wireshark while
> attempting the "ln", and see what happens.  That should tell us whether
> it's the client or server that's failing the operation.
> 
> --b.
> 
>>
>> I am using NFSv4 with Vagrant, here is mount entry:
>>
>> 172.28.128.1:PATH on /vagrant type nfs4
>> (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=IP,local_lock=none,addr=IP)
>>
>> I have also verified that rpc-statd is running on host.
>>
>> Host machine is Ubuntu 18.04 with NFS packages version 1:1.3.4-2.1ubuntu5.3.
>>
>> Will appreciate help on this.
>>
>> Thanks,
>> Vasyl