Re: [PATCH 4/5] dax: use sb_issue_zerout instead of calling dax_clear_sectors

["Verma, Vishal L" <vishal.l.verma@intel.com>]

On Wed, 2016-03-30 at 09:49 +0200, Jan Kara wrote:
> On Tue 29-03-16 18:57:16, Verma, Vishal L wrote:
> > 
> > On Mon, 2016-03-28 at 16:34 -0700, Dan Williams wrote:
> > 
> > <>
> > 
> > > 
> > > Seems kind of sad to fail the fault due to a bad block when we
> > > were
> > > going to zero it anyway, right?  I'm not seeing a compelling
> > > reason to
> > > keep any zeroing in fs/dax.c.
> > Agreed - but how do we do this? clear_pmem needs to be able to clear
> > an
> > arbitrary number of bytes, but to go through the driver, we'd need
> > to
> > send down a bio? If only the driver had an rw_bytes like interface
> > that
> > could be used by anyone... :)
> Actually, my patches for page fault locking remove zeroing from
> dax_insert_mapping() and __dax_pmd_fault() - the zeroing now happens
> from
> the filesystem only and the zeroing in those two functions is just a
> dead
> code...

That should make things easier! Do you have a tree I could merge in to
get this? (WIP is ok as we know that my series will depend on yours..)
or, if you can distill out that patch on a 4.6-rc1 base, I could carry
it in my series too (your v2's 3/10 doesn't apply on 4.6-rc1..)

Thanks,
	-Vishal