From patchwork Tue Jun 14 17:16:01 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9176323 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7D82E60772 for ; Tue, 14 Jun 2016 17:16:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7038F28047 for ; Tue, 14 Jun 2016 17:16:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 650F72823D; Tue, 14 Jun 2016 17:16:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0B3A728047 for ; Tue, 14 Jun 2016 17:16:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752112AbcFNRQV (ORCPT ); Tue, 14 Jun 2016 13:16:21 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:60651 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751898AbcFNRQV (ORCPT ); Tue, 14 Jun 2016 13:16:21 -0400 Received: from [83.175.99.196] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.80.1 #2 (Red Hat Linux)) id 1bCrwp-0005PA-DM; Tue, 14 Jun 2016 17:16:19 +0000 From: Christoph Hellwig To: axboe@kernel.dk Cc: mst@redhat.com, ooo@electrozaur.com, nab@linux-iscsi.org, linux-block@vger.kernel.org Subject: [PATCH 4/7] block: simplify and export blk_rq_append_bio Date: Tue, 14 Jun 2016 19:16:01 +0200 Message-Id: <1465924564-14503-5-git-send-email-hch@lst.de> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1465924564-14503-1-git-send-email-hch@lst.de> References: <1465924564-14503-1-git-send-email-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The target SCSI passthrough backend is much better served with the low-level blk_rq_append_bio construct then the helpers built on top of it, so export it. Also use the opportunity to remove the pointless request_queue argument and make the code flow a little more readable. Signed-off-by: Christoph Hellwig --- block/blk-core.c | 2 +- block/blk-map.c | 25 +++++++++++++++---------- block/blk.h | 2 -- include/linux/blkdev.h | 1 + 4 files changed, 17 insertions(+), 13 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 37852ec..2c4c021 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1364,7 +1364,7 @@ struct request *blk_make_request(struct request_queue *q, struct bio *bio, int ret; blk_queue_bounce(q, &bounce_bio); - ret = blk_rq_append_bio(q, rq, bounce_bio); + ret = blk_rq_append_bio(rq, bounce_bio); if (unlikely(ret)) { blk_put_request(rq); return ERR_PTR(ret); diff --git a/block/blk-map.c b/block/blk-map.c index 61733a6..b8657fa 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -9,21 +9,26 @@ #include "blk.h" -int blk_rq_append_bio(struct request_queue *q, struct request *rq, - struct bio *bio) +/* + * Append a bio to a passthrough request. Only works can be merged into + * the request based on the driver constraints. + */ +int blk_rq_append_bio(struct request *rq, struct bio *bio) { - if (!rq->bio) - blk_rq_bio_prep(q, rq, bio); - else if (!ll_back_merge_fn(q, rq, bio)) - return -EINVAL; - else { + if (!rq->bio) { + blk_rq_bio_prep(rq->q, rq, bio); + } else { + if (!ll_back_merge_fn(rq->q, rq, bio)) + return -EINVAL; + rq->biotail->bi_next = bio; rq->biotail = bio; - rq->__data_len += bio->bi_iter.bi_size; } + return 0; } +EXPORT_SYMBOL(blk_rq_append_bio); static int __blk_rq_unmap_user(struct bio *bio) { @@ -71,7 +76,7 @@ static int __blk_rq_map_user_iov(struct request *rq, */ bio_get(bio); - ret = blk_rq_append_bio(q, rq, bio); + ret = blk_rq_append_bio(rq, bio); if (ret) { bio_endio(bio); __blk_rq_unmap_user(orig_bio); @@ -229,7 +234,7 @@ int blk_rq_map_kern(struct request_queue *q, struct request *rq, void *kbuf, if (do_copy) rq->cmd_flags |= REQ_COPY_USER; - ret = blk_rq_append_bio(q, rq, bio); + ret = blk_rq_append_bio(rq, bio); if (unlikely(ret)) { /* request is too big */ bio_put(bio); diff --git a/block/blk.h b/block/blk.h index 70e4aee..c37492f 100644 --- a/block/blk.h +++ b/block/blk.h @@ -64,8 +64,6 @@ void blk_exit_rl(struct request_list *rl); void init_request_from_bio(struct request *req, struct bio *bio); void blk_rq_bio_prep(struct request_queue *q, struct request *rq, struct bio *bio); -int blk_rq_append_bio(struct request_queue *q, struct request *rq, - struct bio *bio); void blk_queue_bypass_start(struct request_queue *q); void blk_queue_bypass_end(struct request_queue *q); void blk_dequeue_request(struct request *rq); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9d1e0a4..07176f4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -801,6 +801,7 @@ extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, extern void blk_rq_unprep_clone(struct request *rq); extern int blk_insert_cloned_request(struct request_queue *q, struct request *rq); +extern int blk_rq_append_bio(struct request *rq, struct bio *bio); extern void blk_delay_queue(struct request_queue *, unsigned long); extern void blk_queue_split(struct request_queue *, struct bio **, struct bio_set *);