[Samba] vfs readahead && windows server 2016/2019?

[Jeremy Allison]

On Mon, Nov 09, 2020 at 04:48:31PM -0500, Robert Buck via samba wrote:
> Quick question...
> 
> The docs for vfs readahead mention Windows Vista, but what about modern
> Windows versions? Windows Server 2016 or Windows Server 2019?

vfs_readahead would need to be updated for our
modern VFS. It only calls Linux readahead for
sendfile()/pread(), and modern Samba exclusively
calls pread_send()/pread_recv() with threads
on most systems.