[LU-1789] Lightweight connection support

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.0, Lustre 2.1.4, Lustre 1.8.9
• Affects Version/s: Lustre 2.4.0
• Assignee: Johann Lombardi (Inactive)
• Reporter: Johann Lombardi (Inactive)

Description

Add support for lightweight connection having the following properties:

• no export is added to last_rcvd file, so no recovery is possible
• a new lightweight connection can be established while the target is in recovery
• locks can still be acquired through this connection, although they won't be replayed.

Issue Links

• is related to: LU-1842 Quota enforcement landing