[PATCH 0/2] [focal/impish/jammy linux-azure] Add sunrpc module parameters for NFSv3 nconnect

[Tim Gardner]

BugLink: https://bugs.launchpad.net/bugs/1958990

SRU Justification

[Impact]

Microsoft has requested the addition of 2 module parameters to sunrpc.
The primary purpose of which is to restrict or pin NFSv3 TCP connections
to one server in order to take advantage of local server connection caching.
In the presence of a load balancer, round robin connection requests defeats
the advantages of local caching.

This patch also fixes a race condition when setting RPC message values and
adding a client connection to the task list. Before, client connections were
added to the task list before the associated RPC message was fully setup.

With the author's permission I have changed the default value of enable_azure_nconnect
to false in order to preserve the original logic of this module with the exception
of the above mentioned race condition.

[Test Plan]

Microsoft tested

[Where things could go wrong]

NFSv3 connection attempts could be slow or fail altogether.

[Other Info]

SF: #00312346