Suggested by Andreas:
in ll_md_blocking_ast(), Instead of doing multiple searches for these lock bits, it makes more sense to change ll_have_md_lock() to take "&bits" as the parameter (instead of a specific single bit), and then it can do a search on the first bit in the mask. If any lock is found, it can zero out all of the set lock bits in the lock from "&bits".

In the common case where there are multiple bits set in the lock this will avoid calling ll_have_md_lock->md_lock_match() multiple times for each file.