On Mon, Mar 16, 2015 at 11:05:33PM +0000, Al Viro wrote:
> > diff --git a/mm/iov_iter.c b/mm/iov_iter.c
> > index 827732047da1..be9a7c5b8703 100644
> > --- a/mm/iov_iter.c
> > +++ b/mm/iov_iter.c
> > @@ -61,7 +61,7 @@
> > __p = i->bvec; \
> > __v.bv_len = min_t(size_t, n, __p->bv_len - skip); \
> > if (likely(__v.bv_len)) { \
> > - __v.bv_page = __p->bv_page; \
> > + __v.bv_pfn = __p->bv_pfn; \
> > __v.bv_offset = __p->bv_offset + skip; \
> > (void)(STEP); \
> > skip += __v.bv_len; \
> > @@ -72,7 +72,7 @@
> > __v.bv_len = min_t(size_t, n, __p->bv_len); \
> > if (unlikely(!__v.bv_len)) \
> > continue; \
> > - __v.bv_page = __p->bv_page; \
> > + __v.bv_pfn = __p->bv_pfn; \
> > __v.bv_offset = __p->bv_offset; \
> > (void)(STEP); \
> > skip = __v.bv_len; \
> > @@ -369,7 +369,7 @@ size_t copy_to_iter(void *addr, size_t bytes, struct iov_iter *i)
> > iterate_and_advance(i, bytes, v,
> > __copy_to_user(v.iov_base, (from += v.iov_len) - v.iov_len,
> > v.iov_len),
> > - memcpy_to_page(v.bv_page, v.bv_offset,
> > + memcpy_to_page(bvec_page(&v), v.bv_offset,
>
> How had memcpy_to_page(NULL, ...) worked for you?
static inline struct page *bvec_page(const struct bio_vec *bvec)
{
- return bvec->bv_page;
+ return pfn_to_page(bvec->bv_pfn.pfn);
}
(yes, more work to be done here to make copy_to_iter work to a bvec that
is actually targetting a page-less address, but these are RFC patches
showing the direction we're heading in while keeping current code working)
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