161 	void (*get_page)(struct dpages *dp,
163 	void (*next_page)(struct dpages *dp);
175 static void list_get_page(struct dpages *dp,  in list_get_page()  argument
178 	unsigned o = dp->context_u;  in list_get_page()
179 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_get_page()
186 static void list_next_page(struct dpages *dp)  in list_next_page()  argument
188 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_next_page()
189 	dp->context_ptr = pl->next;  in list_next_page()
190 	dp->context_u = 0;  in list_next_page()
193 static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offset)  in list_dp_init()  argument
195 	dp->get_page = list_get_page;  in list_dp_init()
196 	dp->next_page = list_next_page;  in list_dp_init()
197 	dp->context_u = offset;  in list_dp_init()
198 	dp->context_ptr = pl;  in list_dp_init()
204 static void bio_get_page(struct dpages *dp, struct page **p,  in bio_get_page()  argument
207 	struct bio_vec *bvec = dp->context_ptr;  in bio_get_page()
209 	*len = bvec->bv_len - dp->context_u;  in bio_get_page()
210 	*offset = bvec->bv_offset + dp->context_u;  in bio_get_page()
213 static void bio_next_page(struct dpages *dp)  in bio_next_page()  argument
215 	struct bio_vec *bvec = dp->context_ptr;  in bio_next_page()
216 	dp->context_ptr = bvec + 1;  in bio_next_page()
217 	dp->context_u = 0;  in bio_next_page()
220 static void bio_dp_init(struct dpages *dp, struct bio *bio)  in bio_dp_init()  argument
222 	dp->get_page = bio_get_page;  in bio_dp_init()
223 	dp->next_page = bio_next_page;  in bio_dp_init()
224 	dp->context_ptr = __bvec_iter_bvec(bio->bi_io_vec, bio->bi_iter);  in bio_dp_init()
225 	dp->context_u = bio->bi_iter.bi_bvec_done;  in bio_dp_init()
231 static void vm_get_page(struct dpages *dp,  in vm_get_page()  argument
234 	*p = vmalloc_to_page(dp->context_ptr);  in vm_get_page()
235 	*offset = dp->context_u;  in vm_get_page()
236 	*len = PAGE_SIZE - dp->context_u;  in vm_get_page()
239 static void vm_next_page(struct dpages *dp)  in vm_next_page()  argument
241 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in vm_next_page()
242 	dp->context_u = 0;  in vm_next_page()
245 static void vm_dp_init(struct dpages *dp, void *data)  in vm_dp_init()  argument
247 	dp->get_page = vm_get_page;  in vm_dp_init()
248 	dp->next_page = vm_next_page;  in vm_dp_init()
249 	dp->context_u = ((unsigned long) data) & (PAGE_SIZE - 1);  in vm_dp_init()
250 	dp->context_ptr = data;  in vm_dp_init()
256 static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,  in km_get_page()  argument
259 	*p = virt_to_page(dp->context_ptr);  in km_get_page()
260 	*offset = dp->context_u;  in km_get_page()
261 	*len = PAGE_SIZE - dp->context_u;  in km_get_page()
264 static void km_next_page(struct dpages *dp)  in km_next_page()  argument
266 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in km_next_page()
267 	dp->context_u = 0;  in km_next_page()
270 static void km_dp_init(struct dpages *dp, void *data)  in km_dp_init()  argument
272 	dp->get_page = km_get_page;  in km_dp_init()
273 	dp->next_page = km_next_page;  in km_dp_init()
274 	dp->context_u = ((unsigned long) data) & (PAGE_SIZE - 1);  in km_dp_init()
275 	dp->context_ptr = data;  in km_dp_init()
282 		      struct dpages *dp, struct io *io)  in do_region()  argument
335 			dp->get_page(dp, &page, &len, &offset);  in do_region()
342 			dp->next_page(dp);  in do_region()
347 			dp->get_page(dp, &page, &len, &offset);  in do_region()
354 			dp->next_page(dp);  in do_region()
363 			struct dm_io_region *where, struct dpages *dp,  in dispatch_io()  argument
367 	struct dpages old_pages = *dp;  in dispatch_io()
379 		*dp = old_pages;  in dispatch_io()
381 			do_region(rw, i, where + i, dp, io);  in dispatch_io()
405 		   struct dm_io_region *where, int rw, struct dpages *dp,  in sync_io()  argument
425 	io->vma_invalidate_address = dp->vma_invalidate_address;  in sync_io()
426 	io->vma_invalidate_size = dp->vma_invalidate_size;  in sync_io()
428 	dispatch_io(rw, num_regions, where, dp, io, 1);  in sync_io()
439 		    struct dm_io_region *where, int rw, struct dpages *dp,  in async_io()  argument
457 	io->vma_invalidate_address = dp->vma_invalidate_address;  in async_io()
458 	io->vma_invalidate_size = dp->vma_invalidate_size;  in async_io()
460 	dispatch_io(rw, num_regions, where, dp, io, 0);  in async_io()
464 static int dp_init(struct dm_io_request *io_req, struct dpages *dp,  in dp_init()  argument
469 	dp->vma_invalidate_address = NULL;  in dp_init()
470 	dp->vma_invalidate_size = 0;  in dp_init()
474 		list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);  in dp_init()
478 		bio_dp_init(dp, io_req->mem.ptr.bio);  in dp_init()
484 			dp->vma_invalidate_address = io_req->mem.ptr.vma;  in dp_init()
485 			dp->vma_invalidate_size = size;  in dp_init()
487 		vm_dp_init(dp, io_req->mem.ptr.vma);  in dp_init()
491 		km_dp_init(dp, io_req->mem.ptr.addr);  in dp_init()
513 	struct dpages dp;  in dm_io()  local
515 	r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);  in dm_io()
521 			       io_req->bi_rw, &dp, sync_error_bits);  in dm_io()
524 			&dp, io_req->notify.fn, io_req->notify.context);  in dm_io()