[LU-6581] Fill layout only if the layout lock is granted

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Affects Version/s: Lustre 2.7.0, Lustre 2.8.0
• Labels: hsm
• Severity: 3
• Assignee: Di Wang
• Reporter: Di Wang

Description

In mdt_lvbo_fill(), it should check if the layout lock is granted before filling the layout to the reply, otherwise the layout might be replied to client in both blocking and completion cases, (see ldlm_lockd.c) and client might get stale layout in some cases.