[RFC][PATCH 00/12] Enhanced file stat system call

[Christoph Hellwig]

On Fri, Nov 20, 2015 at 05:19:31PM +0100, Martin Steigerwald wrote:
> I know its mostly relevant for just for FAT32, but on any account rather than 
> trying to write 4 GiB and then file, it would be good to at some time get a 
> dialog at the beginning of the copy.

pathconf/fpathconf is supposed to handle that.  It's not super pretty
but part of Posix.  Linus hates it, but it might be time to give it
another try.