Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761386Ab2KAMlR (ORCPT ); Thu, 1 Nov 2012 08:41:17 -0400 Received: from wolverine01.qualcomm.com ([199.106.114.254]:49718 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750772Ab2KAMlM (ORCPT ); Thu, 1 Nov 2012 08:41:12 -0400 X-IronPort-AV: E=McAfee;i="5400,1158,6882"; a="3397767" From: tlinder To: linux-mmc@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, philippedeswert@gmail.com, jengelh@inai.de, jh80.chung@samsung.com, tgih.jun@samsung.com, arnd.bergmann@linaro.org, Tatyana Brokhman , linux-kernel@vger.kernel.org (open list) Subject: [RFC/PATCH v2 1/2] block:row: Adding support for reinsert already dispatched req Date: Thu, 1 Nov 2012 14:41:03 +0200 Message-Id: <1351773663-19604-1-git-send-email-tlinder@codeaurora.org> X-Mailer: git-send-email 1.7.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2171 Lines: 66 From: Tatyana Brokhman Add support for reinserting already dispatched request back to the schedulers internal data structures. The request will be reinserted back to the queue (head) it was dispatched from as if it was never dispatched. Signed-off-by: Tatyana Brokhman diff --git a/block/row-iosched.c b/block/row-iosched.c index b7965c6..62789a4 100644 --- a/block/row-iosched.c +++ b/block/row-iosched.c @@ -273,6 +273,33 @@ static void row_add_request(struct request_queue *q, } /* + * row_reinsert_req() - Reinsert request back to the scheduler + * @q: dispatch queue + * @rq: request to add + * + * Reinsert the given request back to the queue it was + * dispatched from as if it was never dispatched. + * + * Returns 0 on success, error code otherwise + */ +static int row_reinsert_req(struct request_queue *q, + struct request *rq) +{ + struct row_data *rd = q->elevator->elevator_data; + struct row_queue *rqueue = RQ_ROWQ(rq); + + /* Verify rqueue is legitimate */ + BUG_ON(rqueue != &rd->row_queues[rqueue->prio].rqueue); + + list_add(&rq->queuelist, &rqueue->fifo); + rd->nr_reqs[rq_data_dir(rq)]++; + + row_log_rowq(rd, rqueue->prio, "request reinserted"); + + return 0; +} + +/** * row_remove_request() - Remove given request from scheduler * @q: requests queue * @rq: request to remove @@ -656,6 +683,7 @@ static struct elevator_type iosched_row = { .elevator_merge_req_fn = row_merged_requests, .elevator_dispatch_fn = row_dispatch_requests, .elevator_add_req_fn = row_add_request, + .elevator_reinsert_req_fn = row_reinsert_req, .elevator_former_req_fn = elv_rb_former_request, .elevator_latter_req_fn = elv_rb_latter_request, .elevator_set_req_fn = row_set_request, -- 1.7.6 -- QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. Is a member of Code Aurora Forum, hosted by the Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/