On Wed, Feb 05, 2020 at 10:32:05AM -0800, Christoph Hellwig wrote:
> > diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
> > index 63502ca537eb..f6709200bcd0 100644
> > --- a/drivers/s390/block/dcssblk.c
> > +++ b/drivers/s390/block/dcssblk.c
> > @@ -62,6 +62,7 @@ static const struct dax_operations dcssblk_dax_ops = {
> > .dax_supported = generic_fsdax_supported,
> > .copy_from_iter = dcssblk_dax_copy_from_iter,
> > .copy_to_iter = dcssblk_dax_copy_to_iter,
> > + .zero_page_range = dcssblk_dax_zero_page_range,
> > };
> >
> > struct dcssblk_dev_info {
> > @@ -941,6 +942,12 @@ dcssblk_dax_direct_access(struct dax_device *dax_dev,
> > pgoff_t pgoff,
> > return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn);
> > }
> >
> > +static int dcssblk_dax_zero_page_range(struct dax_device *dax_dev,pgoff_t
> > pgoff,
> > + unsigned offset, size_t len)
> > +{
> > + return generic_dax_zero_page_range(dax_dev, pgoff, offset, len);
> > +}
>
> Wouldn't this need a forward declaration? Then again given that dcssblk
> is the only caller of generic_dax_zero_page_range we might as well merge
> the two. If you want to keep the generic one it could be wired up to
> dcssblk_dax_ops directly, though.
Given dcssblk is the only user, I am inclined to get rid of genric
version. We can add one later if another user shows up.
Thanks
Vivek
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