kernel support for open share modes

[J. Bruce Fields]

How does Samba currently handle deny share modes?  Are they coordinated
with local access?  (Does a local open fail if the file is opened with a
conflicting deny mode by a samba client?)

I'm interested because we'd like to support something similar for NFSv4,
and it doesn't seem that existing kernel support is sufficient to do it
correctly.

This looks like a hard problem, but I'd be curious whether anyone had
thought about it and had any ideas.

--Bruce Fields