[Gluster-devel] Query regards to expose client-pid to fuse process

[Mohit Agrawal]

Hi,

Yes, you are right it is not a default value.

We can assign the client_pid only while volume has mounted after through a
glusterfs binary directly like
/usr/local/sbin/glusterfs --process-name fuse --volfile-server=192.168.1.3
--client-pid=-3 --volfile-id=/test /mnt1

Regards,
Mohit Agrawal


On Fri, Oct 11, 2019 at 4:52 PM Nithya Balachandran <nbalacha at redhat.com>
wrote:

>
>
> On Fri, 11 Oct 2019 at 14:56, Mohit Agrawal <moagrawa at redhat.com> wrote:
>
>> Hi,
>>
>>   I have a query specific to authenticate a client based on the PID
>> (client-pid).
>>   It can break the bricks xlator functionality, Usually, on the brick
>> side we take a decision about the
>>    source of fop request based on PID.If PID value is -ve xlator
>> considers the request has come from an internal
>>   client otherwise it has come from an external client.
>>
>>   If a user has mounted the volume through fuse after provide
>> --client-pid to command line argument similar to internal client PID
>>   in that case brick_xlator consider external fop request also as an
>> internal and it will break functionality.
>>
>>   We are checking pid in (lease, posix-lock, worm, trash) xlator to know
>> about the source of the fops.
>>   Even there are other brick xlators also we are checking specific PID
>> value for all internal
>>   clients that can be break if the external client has the same pid.
>>
>>   My query is why we need to expose client-pid as an argument to the fuse
>> process?
>>
>
>
> I don't think this is a default value to the fuse mount. One place where
> this helps us is with the script based file migration and rebalance - we
> can provide a negative pid to  the special client mount to ensure these
> fops are also treated as internal fops.
>
> In the meantime I do not see the harm in having this option available as
> it allows a specific purpose. Are there any other client processes that use
> this?
>
>    I think we need to resolve it. Please share your view on the same.
>>
>> Thanks,
>> Mohit Agrawal
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