[LU-7433] xattr locks are lost on mdt

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Labels: bgti patch
• Severity: 3
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Vitaly Fertman

Description

mdt_intent_getxattr() can return EFAULT if a buffer cannot be found, it is returned after lock_replace, where a new lock is installed into lockp. An error forces ldlm_lock_enqueue() to destroy the original lock, but ldlm_handle_enqueue0() drops the reference on the new lock. thus, the original destroyed not granted lock is pinned and lost.