samba - Apr 2019 - Trouble renaming file and folders, SMB2+ or newer samba (4.8)?

Little more then a curiosity.


Swithcing from Samba 4.2/NT to Samba 4.8/AD, many users complain about
they have difficulty to rename files and folder (windows error say
'busy file').

We have added to smb.conf:

	socket options = TCP_NODELAY TCP_KEEPIDLE=240 TCP_KEEPCNT=4 TCP_KEEPINTVL=15

and this helped a bit, but still in some situation (where surely
there's only one user in that file/folder) 'lock' hit.

Eg, user A modify file F, then close it, then try immediately to rename
the file or the folder that contain the file, and windows reply with
'busy file'.


It is a new feature of SMB2+? Or samba internally changed something?


As i remember, i've never hitted that on Samba in NT mode...

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