On Sun 17-09-17 19:39:45, Christoph Hellwig wrote: > On Sat, Sep 16, 2017 at 08:44:14PM -0700, Dan Williams wrote: > > So it wasn't all that easy, and Linus declined to take it. I think we > > should add a new ->mmap_validate() file operation and save the > > tree-wide cleanup until later. > > Note that we already have a mmap_capabilities callout for nommu, > I wonder if we could generalize that. So if I understood Dan right, Linus refused to merge the patch which adds 'flags' argument to ->mmap callback. That is actually logically independent change from validating flags passed to mmap(2) syscall. Dan did it just to save himself from adding a VMA flag for MAP_DIRECT. For validating flags passed to mmap(2), I agree we could use ->mmap_capabilities() instead of mmap_supported_mask Dan has added. But I don't have a strong opinion there. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
