[Samba] Renaming a folder while other smbd-users have files opened

[Stefan G. Weichinger]

A rather basic issue, but very important -> the following happened to me 
today:


samba-4.8.3 on a debian stretch machine, AD-domain-member

share:

[daten]
	comment = Daten
	create mask = 0775
	directory mask = 02775
	force directory mode = 0775
	path = /mnt/samba/
	read only = No
	veto oplock files = /*.DAT/*.dat/

situation:

More than 10 users have files open in there, doing their work mostly 
inside the subfolder \\server\daten\Daten (yes, ugly path ... anyway)

"user11" incidentally clicks "rename" on that folder "Daten", deletes 
the whole name in the process, doesn't *remember* that it was "Daten" 
and types "Klienten" (german for "clients", doesn't matter here, just to 
be precise), hits OK or Save or whatever.

Unfortunately that *works* while hundreds of files are opened by others, 
resulting in dozens of processes hanging ... and leads to an urgency 
call to yours truly.

(I killed all the samba-processes, stopped them, moved the files back 
and restarted ... )

question:

why does that work? why isn't that blocked/forbidden/not allowed?
Do we miss something, could it be regulated better by setting ACLs or so?

For sure I plan to upgrade to 4.8.5 asap, but I assume that the above 
topic is not a bug-related-behavior.

Stefan