169 	void (*get_page)(struct dpages *dp,
171 	void (*next_page)(struct dpages *dp);
186 static void list_get_page(struct dpages *dp,  in list_get_page()  argument
189 	unsigned int o = dp->context_u;  in list_get_page()
190 	struct page_list *pl = dp->context_ptr;  in list_get_page()
197 static void list_next_page(struct dpages *dp)  in list_next_page()  argument
199 	struct page_list *pl = dp->context_ptr;  in list_next_page()
201 	dp->context_ptr = pl->next;  in list_next_page()
202 	dp->context_u = 0;  in list_next_page()
205 static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned int offset)  in list_dp_init()  argument
207 	dp->get_page = list_get_page;  in list_dp_init()
208 	dp->next_page = list_next_page;  in list_dp_init()
209 	dp->context_u = offset;  in list_dp_init()
210 	dp->context_ptr = pl;  in list_dp_init()
216 static void bio_get_page(struct dpages *dp, struct page **p,  in bio_get_page()  argument
219 	struct bio_vec bvec = bvec_iter_bvec((struct bio_vec *)dp->context_ptr,  in bio_get_page()
220 					     dp->context_bi);  in bio_get_page()
227 	dp->context_bi.bi_sector = (sector_t)bvec.bv_len;  in bio_get_page()
230 static void bio_next_page(struct dpages *dp)  in bio_next_page()  argument
232 	unsigned int len = (unsigned int)dp->context_bi.bi_sector;  in bio_next_page()
234 	bvec_iter_advance((struct bio_vec *)dp->context_ptr,  in bio_next_page()
235 			  &dp->context_bi, len);  in bio_next_page()
238 static void bio_dp_init(struct dpages *dp, struct bio *bio)  in bio_dp_init()  argument
240 	dp->get_page = bio_get_page;  in bio_dp_init()
241 	dp->next_page = bio_next_page;  in bio_dp_init()
247 	dp->context_ptr = bio->bi_io_vec;  in bio_dp_init()
248 	dp->context_bi = bio->bi_iter;  in bio_dp_init()
254 static void vm_get_page(struct dpages *dp,  in vm_get_page()  argument
257 	*p = vmalloc_to_page(dp->context_ptr);  in vm_get_page()
258 	*offset = dp->context_u;  in vm_get_page()
259 	*len = PAGE_SIZE - dp->context_u;  in vm_get_page()
262 static void vm_next_page(struct dpages *dp)  in vm_next_page()  argument
264 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in vm_next_page()
265 	dp->context_u = 0;  in vm_next_page()
268 static void vm_dp_init(struct dpages *dp, void *data)  in vm_dp_init()  argument
270 	dp->get_page = vm_get_page;  in vm_dp_init()
271 	dp->next_page = vm_next_page;  in vm_dp_init()
272 	dp->context_u = offset_in_page(data);  in vm_dp_init()
273 	dp->context_ptr = data;  in vm_dp_init()
279 static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,  in km_get_page()  argument
282 	*p = virt_to_page(dp->context_ptr);  in km_get_page()
283 	*offset = dp->context_u;  in km_get_page()
284 	*len = PAGE_SIZE - dp->context_u;  in km_get_page()
287 static void km_next_page(struct dpages *dp)  in km_next_page()  argument
289 	dp->context_ptr += PAGE_SIZE - dp->context_u;  in km_next_page()
290 	dp->context_u = 0;  in km_next_page()
293 static void km_dp_init(struct dpages *dp, void *data)  in km_dp_init()  argument
295 	dp->get_page = km_get_page;  in km_dp_init()
296 	dp->next_page = km_next_page;  in km_dp_init()
297 	dp->context_u = offset_in_page(data);  in km_dp_init()
298 	dp->context_ptr = data;  in km_dp_init()
307 		      struct dm_io_region *where, struct dpages *dp,  in do_region()  argument
369 				dp->get_page(dp, &page, &len, &offset);  in do_region()
376 				dp->next_page(dp);  in do_region()
386 			struct dm_io_region *where, struct dpages *dp,  in dispatch_io()  argument
390 	struct dpages old_pages = *dp;  in dispatch_io()
396 	 * the dp object for each call to do_region.  in dispatch_io()
399 		*dp = old_pages;  in dispatch_io()
401 			do_region(opf, i, where + i, dp, io, ioprio);  in dispatch_io()
413 		     struct dpages *dp, io_notify_fn fn, void *context,  in async_io()  argument
425 	io->vma_invalidate_address = dp->vma_invalidate_address;  in async_io()
426 	io->vma_invalidate_size = dp->vma_invalidate_size;  in async_io()
428 	dispatch_io(opf, num_regions, where, dp, io, ioprio);  in async_io()
445 		   struct dm_io_region *where, blk_opf_t opf, struct dpages *dp,  in sync_io()  argument
452 	async_io(client, num_regions, where, opf | REQ_SYNC, dp,  in sync_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()
505 	struct dpages dp;  in dm_io()  local
512 	r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);  in dm_io()
518 			       io_req->bi_opf, &dp, sync_error_bits, ioprio);  in dm_io()
520 	async_io(io_req->client, num_regions, where, io_req->bi_opf, &dp,  in dm_io()