Messages in this thread | | | Date | Sun, 8 May 2016 02:01:15 -0700 | From | "" <> | Subject | Re: [PATCH v4 5/7] fs: prioritize and separate direct_io from dax_io |
| |
On Thu, May 05, 2016 at 09:45:07PM +0000, Verma, Vishal L wrote: > I'm not sure I completely understand how this will work? Can you explain > a bit? Would we have to export rw_bytes up to layers above the pmem > driver? Where does get_user_pages come in?
A DAX filesystem can directly use the nvdimm layer the same way btt doe,s what's the problem?
Re get_user_pages my idea was to simply use that to lock down the user pages so that we can call rw_bytes on it. How else would you do it? Do a kmalloc, copy_from_user and then another memcpy?
| |