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

[Jan Kara]

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...

								Honza
-- 
Jan Kara <jack at suse.com>
SUSE Labs, CR