From patchwork Tue Jan 18 07:19:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12715929 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B4A5FC4321E for ; Tue, 18 Jan 2022 07:20:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244816AbiARHUZ (ORCPT ); Tue, 18 Jan 2022 02:20:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244892AbiARHUU (ORCPT ); Tue, 18 Jan 2022 02:20:20 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2C88C06161C; Mon, 17 Jan 2022 23:20:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=cyA51tgTzJ0oURPYTTRoUDyOePKkV9xxN4Hqcjy0whE=; b=EZc+81CnUzY0T30EvM67aJI3+z 2rcuaMsV8QKya0T+YqJZdegYjqp1PSm05E4gs6vx0Jt/MxKpnwmJHh4/aNoyUrZeAM3Prtq2GFePM BO4MGJtNsAatp0/5dziB1d4d4st+oJrfBxUUJQAiYMZ+KJovpwX39qCF8yUJCa825KYnFVdItc84c 6xLHv/tfE20kLMoMKZxyxrkM62nSchOu0k3vrL0A26HdUN1YMVExtPahqJQnW425+XQ2iIzCQWeK2 IPoxv0wlF2h4cuNTWml1G6MmXXo4IVVe+Y5OHqJChA16e9zR2aTSMLwE+hPB4fTw4oRJEB6F4uarB D3MrbYJQ==; Received: from [2001:4bb8:184:72a4:a4a9:19c0:5242:7768] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1n9ims-000ZTk-8m; Tue, 18 Jan 2022 07:20:14 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Pavel Begunkov , Mike Snitzer , Ryusuke Konishi , Konstantin Komarov , Andrew Morton , "Md . Haris Iqbal " , Jack Wang , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Philipp Reisner , Lars Ellenberg , linux-block@vger.kernel.org, dm-devel@redhat.com, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-nilfs@vger.kernel.org, ntfs3@lists.linux.dev, xen-devel@lists.xenproject.org, drbd-dev@lists.linbit.com Subject: [PATCH 07/19] dm-snap: use blkdev_issue_flush instead of open coding it Date: Tue, 18 Jan 2022 08:19:40 +0100 Message-Id: <20220118071952.1243143-8-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220118071952.1243143-1-hch@lst.de> References: <20220118071952.1243143-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Use blkdev_issue_flush, which uses an on-stack bio instead of an opencoded version with a bio embedded into struct dm_snapshot. Signed-off-by: Christoph Hellwig --- drivers/md/dm-snap.c | 21 +-------------------- 1 file changed, 1 insertion(+), 20 deletions(-) diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index dcf34c6b05ad3..0d336b5ec5714 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -141,11 +141,6 @@ struct dm_snapshot { * for them to be committed. */ struct bio_list bios_queued_during_merge; - - /* - * Flush data after merge. - */ - struct bio flush_bio; }; /* @@ -1127,17 +1122,6 @@ static void snapshot_merge_next_chunks(struct dm_snapshot *s) static void error_bios(struct bio *bio); -static int flush_data(struct dm_snapshot *s) -{ - struct bio *flush_bio = &s->flush_bio; - - bio_reset(flush_bio); - bio_set_dev(flush_bio, s->origin->bdev); - flush_bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; - - return submit_bio_wait(flush_bio); -} - static void merge_callback(int read_err, unsigned long write_err, void *context) { struct dm_snapshot *s = context; @@ -1151,7 +1135,7 @@ static void merge_callback(int read_err, unsigned long write_err, void *context) goto shut; } - if (flush_data(s) < 0) { + if (blkdev_issue_flush(s->origin->bdev) < 0) { DMERR("Flush after merge failed: shutting down merge"); goto shut; } @@ -1340,7 +1324,6 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv) s->first_merging_chunk = 0; s->num_merging_chunks = 0; bio_list_init(&s->bios_queued_during_merge); - bio_init(&s->flush_bio, NULL, 0); /* Allocate hash table for COW data */ if (init_hash_tables(s)) { @@ -1528,8 +1511,6 @@ static void snapshot_dtr(struct dm_target *ti) dm_exception_store_destroy(s->store); - bio_uninit(&s->flush_bio); - dm_put_device(ti, s->cow); dm_put_device(ti, s->origin);