528 			struct io_thread_req *io_req = (*irq_req_buffer)[count];  in ubd_handler()  local
530 			if ((io_req->error == BLK_STS_NOTSUPP) && (req_op(io_req->req) == REQ_OP_DISCARD)) {  in ubd_handler()
531 				blk_queue_max_discard_sectors(io_req->req->q, 0);  in ubd_handler()
532 				blk_queue_max_write_zeroes_sectors(io_req->req->q, 0);  in ubd_handler()
533 				blk_queue_flag_clear(QUEUE_FLAG_DISCARD, io_req->req->q);  in ubd_handler()
535 			blk_mq_end_request(io_req->req, io_req->error);  in ubd_handler()
536 			kfree(io_req);  in ubd_handler()
1318 static void ubd_map_req(struct ubd *dev, struct io_thread_req *io_req,  in ubd_map_req()  argument
1324 	unsigned long byte_offset = io_req->offset;  in ubd_map_req()
1328 		io_req->io_desc[0].buffer = NULL;  in ubd_map_req()
1329 		io_req->io_desc[0].length = blk_rq_bytes(req);  in ubd_map_req()
1332 			BUG_ON(i >= io_req->desc_cnt);  in ubd_map_req()
1334 			io_req->io_desc[i].buffer =  in ubd_map_req()
1336 			io_req->io_desc[i].length = bvec.bv_len;  in ubd_map_req()
1342 		for (i = 0; i < io_req->desc_cnt; i++) {  in ubd_map_req()
1343 			cowify_req(io_req, &io_req->io_desc[i], byte_offset,  in ubd_map_req()
1346 			byte_offset += io_req->io_desc[i].length;  in ubd_map_req()
1355 	struct io_thread_req *io_req;  in ubd_alloc_req()  local
1358 	io_req = kmalloc(sizeof(*io_req) +  in ubd_alloc_req()
1361 	if (!io_req)  in ubd_alloc_req()
1364 	io_req->req = req;  in ubd_alloc_req()
1366 		io_req->fds[0] = dev->cow.fd;  in ubd_alloc_req()
1368 		io_req->fds[0] = dev->fd;  in ubd_alloc_req()
1369 	io_req->error = 0;  in ubd_alloc_req()
1370 	io_req->sectorsize = SECTOR_SIZE;  in ubd_alloc_req()
1371 	io_req->fds[1] = dev->fd;  in ubd_alloc_req()
1372 	io_req->offset = (u64) blk_rq_pos(req) << SECTOR_SHIFT;  in ubd_alloc_req()
1373 	io_req->offsets[0] = 0;  in ubd_alloc_req()
1374 	io_req->offsets[1] = dev->cow.data_offset;  in ubd_alloc_req()
1377 		io_req->io_desc[i].sector_mask = 0;  in ubd_alloc_req()
1378 		io_req->io_desc[i].cow_offset = -1;  in ubd_alloc_req()
1381 	return io_req;  in ubd_alloc_req()
1387 	struct io_thread_req *io_req;  in ubd_submit_request()  local
1398 	io_req = ubd_alloc_req(dev, req, segs);  in ubd_submit_request()
1399 	if (!io_req)  in ubd_submit_request()
1402 	io_req->desc_cnt = segs;  in ubd_submit_request()
1404 		ubd_map_req(dev, io_req, req);  in ubd_submit_request()
1406 	ret = os_write_file(thread_fd, &io_req, sizeof(io_req));  in ubd_submit_request()
1407 	if (ret != sizeof(io_req)) {  in ubd_submit_request()
1410 		kfree(io_req);  in ubd_submit_request()