There are various testcases (xfstests) and apps that require support
for O_TMPFILE and there is a similar concept in SMB3 on the wire ...
but the Linux VFS calls create (for a tmpfile) and then open ... which
is a problem (since tmpfiles would disappear after create/close in SMB
if created with "DELETE_ON_CLOSE" ...)

Here is a work in progress patch that gets part way to O_TMPFILE
support over SMB3 ... any ideas how to get past the problem with the
open/create of O_TMPFILE not being atomic (causing opencreate then
close then open ...)

See attached


-- 
Thanks,

Steve