1213 static void prepare_request(struct request *req, struct io_thread_req *io_req,  in prepare_request()  argument
1220 	io_req->req = req;  in prepare_request()
1221 	io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :  in prepare_request()
1223 	io_req->fds[1] = ubd_dev->fd;  in prepare_request()
1224 	io_req->cow_offset = -1;  in prepare_request()
1225 	io_req->offset = offset;  in prepare_request()
1226 	io_req->length = len;  in prepare_request()
1227 	io_req->error = 0;  in prepare_request()
1228 	io_req->sector_mask = 0;  in prepare_request()
1230 	io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;  in prepare_request()
1231 	io_req->offsets[0] = 0;  in prepare_request()
1232 	io_req->offsets[1] = ubd_dev->cow.data_offset;  in prepare_request()
1233 	io_req->buffer = page_address(page) + page_offset;  in prepare_request()
1234 	io_req->sectorsize = 1 << 9;  in prepare_request()
1237 		cowify_req(io_req, ubd_dev->cow.bitmap,  in prepare_request()
1244 				  struct io_thread_req *io_req)  in prepare_flush_request()  argument
1249 	io_req->req = req;  in prepare_flush_request()
1250 	io_req->fds[0] = (ubd_dev->cow.file != NULL) ? ubd_dev->cow.fd :  in prepare_flush_request()
1252 	io_req->op = UBD_FLUSH;  in prepare_flush_request()
1255 static bool submit_request(struct io_thread_req *io_req, struct ubd *dev)  in submit_request()  argument
1257 	int n = os_write_file(thread_fd, &io_req,  in submit_request()
1258 			     sizeof(io_req));  in submit_request()
1259 	if (n != sizeof(io_req)) {  in submit_request()
1266 		kfree(io_req);  in submit_request()
1275 	struct io_thread_req *io_req;  in do_ubd_request()  local
1294 			io_req = kmalloc(sizeof(struct io_thread_req),  in do_ubd_request()
1296 			if (io_req == NULL) {  in do_ubd_request()
1301 			prepare_flush_request(req, io_req);  in do_ubd_request()
1302 			if (submit_request(io_req, dev) == false)  in do_ubd_request()
1309 			io_req = kmalloc(sizeof(struct io_thread_req),  in do_ubd_request()
1311 			if(io_req == NULL){  in do_ubd_request()
1316 			prepare_request(req, io_req,  in do_ubd_request()
1320 			if (submit_request(io_req, dev) == false)  in do_ubd_request()