[LU-104] Lustre grants flock exclusive locks on two file descriptors for the same file

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.1.0
• Affects Version/s: Lustre 2.1.0
• Severity: 3
• Bugzilla ID: 22,660
• Assignee: Oleg Drokin
• Reporter: Christopher Morrone (Inactive)

Description

Lustre grants flock exclusive locks on two file descriptors for the same
file in the same process. However, the second flock SHOULD fail.

Fortunately, the VFS already has the correct behavior. And since we are
already calling the flock_lock_file_wait() or posix_lock_file_wait() VFS
calls, we just need to record that return code and return it in
ll_file_lock().

This patch was already landed on 1.8, needs to land on master.