[PATCH 5/5] dax: handle media errors in dax_do_io

[Christoph Hellwig]

On Thu, Mar 24, 2016 at 05:17:30PM -0600, Vishal Verma wrote:
> dax_do_io (called for read() or write() for a dax file system) may fail
> in the presence of bad blocks or media errors. Since we expect that a
> write should clear media errors on nvdimms, make dax_do_io fall back to
> the direct_IO path, which will send down a bio to the driver, which can
> then attempt to clear the error.

Leave the fallback on -EIO to the callers please.  They generally call
__blockdev_direct_IO anyway, so it should actually become simpler that
way.