160 	void (*get_page)(struct dpages *dp,
162 	void (*next_page)(struct dpages *dp);
174 static void list_get_page(struct dpages *dp,  in list_get_page()  argument
177 	unsigned o = dp->context_u;  in list_get_page()
178 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_get_page()
185 static void list_next_page(struct dpages *dp)  in list_next_page()  argument
187 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_next_page()
188 	dp->context_ptr = pl->next;  in list_next_page()
189 	dp->context_u = 0;  in list_next_page()
192 static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offset)  in list_dp_init()  argument
194 	dp->get_page = list_get_page;  in list_dp_init()
195 	dp->next_page = list_next_page;  in list_dp_init()
196 	dp->context_u = offset;  in list_dp_init()
197 	dp->context_ptr = pl;  in list_dp_init()
203 static void bio_get_page(struct dpages *dp, struct page **p,  in bio_get_page()  argument
206 	struct bio_vec *bvec = dp->context_ptr;  in bio_get_page()
208 	*len = bvec->bv_len - dp->context_u;  in bio_get_page()
209 	*offset = bvec->bv_offset + dp->context_u;  in bio_get_page()
212 static void bio_next_page(struct dpages *dp)  in bio_next_page()  argument
214 	struct bio_vec *bvec = dp->context_ptr;  in bio_next_page()
215 	dp->context_ptr = bvec + 1;  in bio_next_page()
216 	dp->context_u = 0;  in bio_next_page()
219 static void bio_dp_init(struct dpages *dp, struct bio *bio)  in bio_dp_init()  argument
221 	dp->get_page = bio_get_page;  in bio_dp_init()
222 	dp->next_page = bio_next_page;  in bio_dp_init()
223 	dp->context_ptr = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);  in bio_dp_init()
224 	dp->context_u = bio->bi_iter.bi_bvec_done;  in bio_dp_init()
230 static void vm_get_page(struct dpages *dp,  in vm_get_page()  argument
233 	*p = vmalloc_to_page(dp->context_ptr);  in vm_get_page()
234 	*offset = dp->context_u;  in vm_get_page()
235 	*len = PAGE_SIZE - dp->context_u;  in vm_get_page()
238 static void vm_next_page(struct dpages *dp)  in vm_next_page()  argument
240 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in vm_next_page()
241 	dp->context_u = 0;  in vm_next_page()
244 static void vm_dp_init(struct dpages *dp, void *data)  in vm_dp_init()  argument
246 	dp->get_page = vm_get_page;  in vm_dp_init()
247 	dp->next_page = vm_next_page;  in vm_dp_init()
248 	dp->context_u = ((unsigned long) data) & (PAGE_SIZE - 1);  in vm_dp_init()
249 	dp->context_ptr = data;  in vm_dp_init()
255 static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,  in km_get_page()  argument
258 	*p = virt_to_page(dp->context_ptr);  in km_get_page()
259 	*offset = dp->context_u;  in km_get_page()
260 	*len = PAGE_SIZE - dp->context_u;  in km_get_page()
263 static void km_next_page(struct dpages *dp)  in km_next_page()  argument
265 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in km_next_page()
266 	dp->context_u = 0;  in km_next_page()
269 static void km_dp_init(struct dpages *dp, void *data)  in km_dp_init()  argument
271 	dp->get_page = km_get_page;  in km_dp_init()
272 	dp->next_page = km_next_page;  in km_dp_init()
273 	dp->context_u = ((unsigned long) data) & (PAGE_SIZE - 1);  in km_dp_init()
274 	dp->context_ptr = data;  in km_dp_init()
281 		      struct dpages *dp, struct io *io)  in do_region()  argument
334 			dp->get_page(dp, &page, &len, &offset);  in do_region()
341 			dp->next_page(dp);  in do_region()
346 			dp->get_page(dp, &page, &len, &offset);  in do_region()
353 			dp->next_page(dp);  in do_region()
362 			struct dm_io_region *where, struct dpages *dp,  in dispatch_io()  argument
366 	struct dpages old_pages = *dp;  in dispatch_io()
378 		*dp = old_pages;  in dispatch_io()
380 			do_region(rw, i, where + i, dp, io);  in dispatch_io()
404 		   struct dm_io_region *where, int rw, struct dpages *dp,  in sync_io()  argument
424 	io->vma_invalidate_address = dp->vma_invalidate_address;  in sync_io()
425 	io->vma_invalidate_size = dp->vma_invalidate_size;  in sync_io()
427 	dispatch_io(rw, num_regions, where, dp, io, 1);  in sync_io()
438 		    struct dm_io_region *where, int rw, struct dpages *dp,  in async_io()  argument
456 	io->vma_invalidate_address = dp->vma_invalidate_address;  in async_io()
457 	io->vma_invalidate_size = dp->vma_invalidate_size;  in async_io()
459 	dispatch_io(rw, num_regions, where, dp, io, 0);  in async_io()
463 static int dp_init(struct dm_io_request *io_req, struct dpages *dp,  in dp_init()  argument
468 	dp->vma_invalidate_address = NULL;  in dp_init()
469 	dp->vma_invalidate_size = 0;  in dp_init()
473 		list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);  in dp_init()
477 		bio_dp_init(dp, io_req->mem.ptr.bio);  in dp_init()
483 			dp->vma_invalidate_address = io_req->mem.ptr.vma;  in dp_init()
484 			dp->vma_invalidate_size = size;  in dp_init()
486 		vm_dp_init(dp, io_req->mem.ptr.vma);  in dp_init()
490 		km_dp_init(dp, io_req->mem.ptr.addr);  in dp_init()
512 	struct dpages dp;  in dm_io()  local
514 	r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);  in dm_io()
520 			       io_req->bi_rw, &dp, sync_error_bits);  in dm_io()
523 			&dp, io_req->notify.fn, io_req->notify.context);  in dm_io()