162 	void (*get_page)(struct dpages *dp,
164 	void (*next_page)(struct dpages *dp);
179 static void list_get_page(struct dpages *dp,  in list_get_page()  argument
182 	unsigned o = dp->context_u;  in list_get_page()
183 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_get_page()
190 static void list_next_page(struct dpages *dp)  in list_next_page()  argument
192 	struct page_list *pl = (struct page_list *) dp->context_ptr;  in list_next_page()
193 	dp->context_ptr = pl->next;  in list_next_page()
194 	dp->context_u = 0;  in list_next_page()
197 static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offset)  in list_dp_init()  argument
199 	dp->get_page = list_get_page;  in list_dp_init()
200 	dp->next_page = list_next_page;  in list_dp_init()
201 	dp->context_u = offset;  in list_dp_init()
202 	dp->context_ptr = pl;  in list_dp_init()
208 static void bio_get_page(struct dpages *dp, struct page **p,  in bio_get_page()  argument
211 	struct bio_vec bvec = bvec_iter_bvec((struct bio_vec *)dp->context_ptr,  in bio_get_page()
212 					     dp->context_bi);  in bio_get_page()
219 	dp->context_bi.bi_sector = (sector_t)bvec.bv_len;  in bio_get_page()
222 static void bio_next_page(struct dpages *dp)  in bio_next_page()  argument
224 	unsigned int len = (unsigned int)dp->context_bi.bi_sector;  in bio_next_page()
226 	bvec_iter_advance((struct bio_vec *)dp->context_ptr,  in bio_next_page()
227 			  &dp->context_bi, len);  in bio_next_page()
230 static void bio_dp_init(struct dpages *dp, struct bio *bio)  in bio_dp_init()  argument
232 	dp->get_page = bio_get_page;  in bio_dp_init()
233 	dp->next_page = bio_next_page;  in bio_dp_init()
239 	dp->context_ptr = bio->bi_io_vec;  in bio_dp_init()
240 	dp->context_bi = bio->bi_iter;  in bio_dp_init()
246 static void vm_get_page(struct dpages *dp,  in vm_get_page()  argument
249 	*p = vmalloc_to_page(dp->context_ptr);  in vm_get_page()
250 	*offset = dp->context_u;  in vm_get_page()
251 	*len = PAGE_SIZE - dp->context_u;  in vm_get_page()
254 static void vm_next_page(struct dpages *dp)  in vm_next_page()  argument
256 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in vm_next_page()
257 	dp->context_u = 0;  in vm_next_page()
260 static void vm_dp_init(struct dpages *dp, void *data)  in vm_dp_init()  argument
262 	dp->get_page = vm_get_page;  in vm_dp_init()
263 	dp->next_page = vm_next_page;  in vm_dp_init()
264 	dp->context_u = offset_in_page(data);  in vm_dp_init()
265 	dp->context_ptr = data;  in vm_dp_init()
271 static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,  in km_get_page()  argument
274 	*p = virt_to_page(dp->context_ptr);  in km_get_page()
275 	*offset = dp->context_u;  in km_get_page()
276 	*len = PAGE_SIZE - dp->context_u;  in km_get_page()
279 static void km_next_page(struct dpages *dp)  in km_next_page()  argument
281 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in km_next_page()
282 	dp->context_u = 0;  in km_next_page()
285 static void km_dp_init(struct dpages *dp, void *data)  in km_dp_init()  argument
287 	dp->get_page = km_get_page;  in km_dp_init()
288 	dp->next_page = km_next_page;  in km_dp_init()
289 	dp->context_u = offset_in_page(data);  in km_dp_init()
290 	dp->context_ptr = data;  in km_dp_init()
297 		      struct dm_io_region *where, struct dpages *dp,  in do_region()  argument
357 			dp->get_page(dp, &page, &len, &offset);  in do_region()
364 			dp->next_page(dp);  in do_region()
373 			struct dm_io_region *where, struct dpages *dp,  in dispatch_io()  argument
377 	struct dpages old_pages = *dp;  in dispatch_io()
386 	 * the dp object for each call to do_region.  in dispatch_io()
389 		*dp = old_pages;  in dispatch_io()
391 			do_region(opf, i, where + i, dp, io);  in dispatch_io()
415 		   struct dm_io_region *where, blk_opf_t opf, struct dpages *dp,  in sync_io()  argument
435 	io->vma_invalidate_address = dp->vma_invalidate_address;  in sync_io()
436 	io->vma_invalidate_size = dp->vma_invalidate_size;  in sync_io()
438 	dispatch_io(opf, num_regions, where, dp, io, 1);  in sync_io()
450 		    struct dpages *dp, io_notify_fn fn, void *context)  in async_io()  argument
467 	io->vma_invalidate_address = dp->vma_invalidate_address;  in async_io()
468 	io->vma_invalidate_size = dp->vma_invalidate_size;  in async_io()
470 	dispatch_io(opf, num_regions, where, dp, io, 0);  in async_io()
474 static int dp_init(struct dm_io_request *io_req, struct dpages *dp,  in dp_init()  argument
479 	dp->vma_invalidate_address = NULL;  in dp_init()
480 	dp->vma_invalidate_size = 0;  in dp_init()
484 		list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);  in dp_init()
488 		bio_dp_init(dp, io_req->mem.ptr.bio);  in dp_init()
494 			dp->vma_invalidate_address = io_req->mem.ptr.vma;  in dp_init()
495 			dp->vma_invalidate_size = size;  in dp_init()
497 		vm_dp_init(dp, io_req->mem.ptr.vma);  in dp_init()
501 		km_dp_init(dp, io_req->mem.ptr.addr);  in dp_init()
515 	struct dpages dp;  in dm_io()  local
517 	r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);  in dm_io()
523 			       io_req->bi_opf, &dp, sync_error_bits);  in dm_io()
526 			io_req->bi_opf, &dp, io_req->notify.fn,  in dm_io()