[LU-22] ldlm_resource::lr_lvb_data is protected by wrong lock

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.1.0
• Severity: 3
• Bugzilla ID: 24,336
• Assignee: Zhenyu Xu
• Reporter: Liang Zhen (Inactive)

Description

I found lr_lvb_data is protected by resource lock (lock_res_and_lock) at some places, i.e:
ldlm_server_completion_ast()
lock_res_and_lock(lock);
memcpy(lvb, lock->l_resource->lr_lvb_data,
lock->l_resource->lr_lvb_len);
unlock_res_and_lock(lock);

but what I learnt from the code is, it should be protected by lr_lvb_sem.