[LU-11148] dir migration may deadlock in link locking

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.12.0
• Affects Version/s: Lustre 2.10.0, Lustre 2.11.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

https://review.whamcloud.com/#/c/25262 introduced trybits in IBITS lock, but it doesn't enable trybits for PDO lock in mdt_object_local_lock(), which may cause deadlock, and it is observed in test.