From patchwork Mon Jan 25 12:13:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 12045459 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2651CC433E0 for ; Tue, 26 Jan 2021 05:32:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE9BF22B2C for ; Tue, 26 Jan 2021 05:32:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731490AbhAZFcK (ORCPT ); Tue, 26 Jan 2021 00:32:10 -0500 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:51282 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727875AbhAYMPa (ORCPT ); Mon, 25 Jan 2021 07:15:30 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04420;MF=jefflexu@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0UMpgSO-_1611576822; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UMpgSO-_1611576822) by smtp.aliyun-inc.com(127.0.0.1); Mon, 25 Jan 2021 20:13:42 +0800 From: Jeffle Xu To: snitzer@redhat.com Cc: joseph.qi@linux.alibaba.com, dm-devel@redhat.com, linux-block@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH v2 4/6] dm: always return BLK_QC_T_NONE for bio-based device Date: Mon, 25 Jan 2021 20:13:38 +0800 Message-Id: <20210125121340.70459-5-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210125121340.70459-1-jefflexu@linux.alibaba.com> References: <20210125121340.70459-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Currently the returned cookie of bio-based device is not used at all. In the following patch, bio-based device will actually return a pointer to a specific object as the returned cookie. Signed-off-by: Jeffle Xu Reviewed-by: Mike Snitzer --- drivers/md/dm.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 7bac564f3faa..46ca3b739396 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1252,14 +1252,13 @@ void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors) } EXPORT_SYMBOL_GPL(dm_accept_partial_bio); -static blk_qc_t __map_bio(struct dm_target_io *tio) +static void __map_bio(struct dm_target_io *tio) { int r; sector_t sector; struct bio *clone = &tio->clone; struct dm_io *io = tio->io; struct dm_target *ti = tio->ti; - blk_qc_t ret = BLK_QC_T_NONE; clone->bi_end_io = clone_endio; @@ -1278,7 +1277,7 @@ static blk_qc_t __map_bio(struct dm_target_io *tio) case DM_MAPIO_REMAPPED: /* the bio has been remapped so dispatch it */ trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector); - ret = submit_bio_noacct(clone); + submit_bio_noacct(clone); break; case DM_MAPIO_KILL: free_tio(tio); @@ -1292,8 +1291,6 @@ static blk_qc_t __map_bio(struct dm_target_io *tio) DMWARN("unimplemented target map return value: %d", r); BUG(); } - - return ret; } static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len) @@ -1380,7 +1377,7 @@ static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, } } -static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci, +static void __clone_and_map_simple_bio(struct clone_info *ci, struct dm_target_io *tio, unsigned *len) { struct bio *clone = &tio->clone; @@ -1391,7 +1388,7 @@ static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci, if (len) bio_setup_sector(clone, ci->sector, *len); - return __map_bio(tio); + __map_bio(tio); } static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, @@ -1405,7 +1402,7 @@ static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, while ((bio = bio_list_pop(&blist))) { tio = container_of(bio, struct dm_target_io, clone); - (void) __clone_and_map_simple_bio(ci, tio, len); + __clone_and_map_simple_bio(ci, tio, len); } } @@ -1450,7 +1447,7 @@ static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti, free_tio(tio); return r; } - (void) __map_bio(tio); + __map_bio(tio); return 0; } @@ -1565,11 +1562,10 @@ static void init_clone_info(struct clone_info *ci, struct mapped_device *md, /* * Entry point to split a bio into clones and submit them to the targets. */ -static blk_qc_t __split_and_process_bio(struct mapped_device *md, +static void __split_and_process_bio(struct mapped_device *md, struct dm_table *map, struct bio *bio) { struct clone_info ci; - blk_qc_t ret = BLK_QC_T_NONE; int error = 0; init_clone_info(&ci, md, map, bio); @@ -1613,7 +1609,7 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, bio_chain(b, bio); trace_block_split(b, bio->bi_iter.bi_sector); - ret = submit_bio_noacct(bio); + submit_bio_noacct(bio); break; } } @@ -1621,13 +1617,11 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md, /* drop the extra reference count */ dec_pending(ci.io, errno_to_blk_status(error)); - return ret; } static blk_qc_t dm_submit_bio(struct bio *bio) { struct mapped_device *md = bio->bi_disk->private_data; - blk_qc_t ret = BLK_QC_T_NONE; int srcu_idx; struct dm_table *map; @@ -1657,10 +1651,10 @@ static blk_qc_t dm_submit_bio(struct bio *bio) if (is_abnormal_io(bio)) blk_queue_split(&bio); - ret = __split_and_process_bio(md, map, bio); + __split_and_process_bio(md, map, bio); out: dm_put_live_table(md, srcu_idx); - return ret; + return BLK_QC_T_NONE; } /*-----------------------------------------------------------------