kernel/power/swap.c

233 static void hib_init_batch(struct hib_bio_batch *hb)
235 	atomic_set(&hb->count, 0);
236 	init_waitqueue_head(&hb->wait);
237 	hb->error = BLK_STS_OK;
238 	blk_start_plug(&hb->plug);
241 static void hib_finish_batch(struct hib_bio_batch *hb)
243 	blk_finish_plug(&hb->plug);
248 	struct hib_bio_batch *hb = bio->bi_private;
263 	if (bio->bi_status && !hb->error)
264 		hb->error = bio->bi_status;
265 	if (atomic_dec_and_test(&hb->count))
266 		wake_up(&hb->wait);
272 			 struct hib_bio_batch *hb)
289 	if (hb) {
291 		bio->bi_private = hb;
292 		atomic_inc(&hb->count);
302 static int hib_wait_io(struct hib_bio_batch *hb)
308 	wait_event(hb->wait, atomic_read(&hb->count) == 0);
309 	return blk_status_to_errno(hb->error);
382  *	@hb:		bio completion batch
385 static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
393 	if (hb) {
399 			ret = hib_wait_io(hb); /* Free pages */
409 				hb = NULL;	/* Go synchronous */
416 	return hib_submit_io(REQ_OP_WRITE | REQ_SYNC, offset, src, hb);
458 		struct hib_bio_batch *hb)
466 	error = write_page(buf, offset, hb);
475 		error = write_page(handle->cur, handle->cur_swap, hb);
482 		if (hb && low_free_pages() <= handle->reqd_free_pages) {
483 			error = hib_wait_io(hb);
560 	struct hib_bio_batch hb;
564 	hib_init_batch(&hb);
577 		ret = swap_write_page(handle, data_of(*snapshot), &hb);
585 	err2 = hib_wait_io(&hb);
586 	hib_finish_batch(&hb);
705 	struct hib_bio_batch hb;
714 	hib_init_batch(&hb);
875 				ret = swap_write_page(handle, page, &hb);
886 	err2 = hib_wait_io(&hb);
897 	hib_finish_batch(&hb);
1052 		struct hib_bio_batch *hb)
1063 	error = hib_submit_io(REQ_OP_READ, offset, buf, hb);
1101 	struct hib_bio_batch hb;
1105 	hib_init_batch(&hb);
1118 		ret = swap_read_page(handle, data_of(*snapshot), &hb);
1122 			ret = hib_wait_io(&hb);
1130 	err2 = hib_wait_io(&hb);
1131 	hib_finish_batch(&hb);
1210 	struct hib_bio_batch hb;
1223 	hib_init_batch(&hb);
1346 			ret = swap_read_page(handle, page[ring], &hb);
1373 			ret = hib_wait_io(&hb);
1427 			ret = hib_wait_io(&hb);
1503 	hib_finish_batch(&hb);