From patchwork Tue Jan 30 09:11:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tejun Heo X-Patchwork-Id: 193932 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7301:2087:b0:106:209c:c626 with SMTP id gs7csp1107102dyb; Tue, 30 Jan 2024 01:53:48 -0800 (PST) X-Google-Smtp-Source: AGHT+IFwgwB5JNhg/1w5QHTCRzdKGVtLhCRoTH/01CMgd3hQlZFQQxU2KsogvA1YuaYrvpL/CKvB X-Received: by 2002:a17:903:1104:b0:1d7:3229:ea5c with SMTP id n4-20020a170903110400b001d73229ea5cmr4908291plh.34.1706608428565; Tue, 30 Jan 2024 01:53:48 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1706608428; cv=pass; d=google.com; s=arc-20160816; b=JkptP+MfPVOustMvXMC3JiOgnsrXiWe+yWkYHaNnR8RFd5hH5OWvROXDKJxMOVPAyl Hwh/6BjdfKAfuK2nGezzgd279vNzrlAnBDhofHmSJ7E/iheopRxitquipEbF0oH/r4+G H9Vw5C0ckREuMqfox5viK6bvtMPzGMBI/4wOmjeCrdRFJ8Ced/jA/jXqrDsEevAwBkap 13qgLJrctuxElVEUJHifAgm3N8p3xSC75Ie7YXnEY9P65Kmk+5YlCDVrESIx0eUxVPJF 8Omlh83wR9Y9tpHkKxClkEg0S7GOXDIG66f3/NS4WpEWYOWzTPRo/lt+a2z9w8VG3YfG Wslg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:sender:dkim-signature; bh=EEGg3+Udn4gaw+4rcyLZgU170AVrEZ3wtyY0WMo5DU8=; fh=nv48Pg10cxUB7pT5q0M/ZChn1z8xpByQkNe5Mv6KhbA=; b=BNgGr0CXbVEc3ZM/Ni6WdO8XxsPHD95il5Yh2/+JRYf4E1V81LWsuS8y7vLRuwHXEv A97RAf/4GqoVjF5Bu6XO4QFSRiHJU9vGyyTYgz3+rkh8n6tSpXxp5hYosLUglenjTbzP zAuR8NSuygF3zZmZ80GpmPwZG/GIQyh8n/2MqOSBSdXx9OBho+7LwCLqb+tvdgvJl5vu MOA7tBvEypzxP41O8Fw9gFCJrQ8EHFJ3jI4K59kVZMwqxztntfJ2g4QP8kA5u+bTqw4Y iXzeCc8iU4Kz3VGEGThsfAH3Tpu+TOFC7362j5shenMm5Cenhxxu6CaCwPVX3Mju0Cb7 X+/g== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=c9QVhT1p; arc=pass (i=1 spf=pass spfdomain=gmail.com dkim=pass dkdomain=gmail.com); spf=pass (google.com: domain of linux-kernel+bounces-44227-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-44227-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. [147.75.48.161]) by mx.google.com with ESMTPS id n6-20020a170902e54600b001d8a64238b5si6845181plf.174.2024.01.30.01.53.48 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jan 2024 01:53:48 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-44227-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=c9QVhT1p; arc=pass (i=1 spf=pass spfdomain=gmail.com dkim=pass dkdomain=gmail.com); spf=pass (google.com: domain of linux-kernel+bounces-44227-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) smtp.mailfrom="linux-kernel+bounces-44227-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id 8241CB2A925 for ; Tue, 30 Jan 2024 09:16:58 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3540C67E98; Tue, 30 Jan 2024 09:13:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="c9QVhT1p" Received: from mail-pl1-f173.google.com (mail-pl1-f173.google.com [209.85.214.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 285C466B4F; Tue, 30 Jan 2024 09:13:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706605997; cv=none; b=Zh5RmlBmH1gmPHwDqtE9puZhG6puaXyKuddltDxWSKDghHg/CRFfEb+pishNRM2jXGLWhfxHrpoFcgnJ6FEbfwJmyd1jQfGEq7SXLRX8XInJoUaDRSgF2aSPp3grfAxmPdE+X78YBbNe+UQWrjEaeyqKuFPT1Q02gIyGlroD1jg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706605997; c=relaxed/simple; bh=SZMS+fgtkFfSzguhmeH2OmNAK1/PWSF2Bv2J0fmCKdg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PRn0Zu0xT8E/8xix9a160BJKVWUYExcGO33azdOm3OSvKAeoLX1p2z/+wMlm4heWjyJXYS4EFqXPy0pIf2EqwgRTpGr7Qk7054XVt6Wx//97UMKqP/D9GPV5Juh51RvPDMEnY+is6GVUGkBTOXMFntC1JaXYg9l/huEFdN7383E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=c9QVhT1p; arc=none smtp.client-ip=209.85.214.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f173.google.com with SMTP id d9443c01a7336-1d74045c463so19587385ad.3; Tue, 30 Jan 2024 01:13:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1706605995; x=1707210795; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:from:to:cc:subject:date :message-id:reply-to; bh=EEGg3+Udn4gaw+4rcyLZgU170AVrEZ3wtyY0WMo5DU8=; b=c9QVhT1pxd3bmNmB+U+p5ubaGL890rEaeAjjis8At7XNsp8G0TWINd5Q8yJqIq41Ax ZJ+So/CC6okekogfM7pUojsI4zTfo1HdhX+/Aqjco8J+R8/8wtsSchJTbGOFCWJ5bO7g nbHWdKsFqynFe0GufW6TxtMjN0UVo5bTg1MRRMBjMsWAkhdjKWseU76QslUpEZKqFJmD 7LDnIT2NoebWrwzQoHwGG3n6wp7/P5NUIwERTLM0AX/2vAOp5wDLuWXpRzGgKg75W5aB gr39b0ENOEBmCv7ft2NV0XwPqg/HxWdyjoDM9JVYSZopwWbzKHAzubMTEAS3/HW8yoBX M1Pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706605995; x=1707210795; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=EEGg3+Udn4gaw+4rcyLZgU170AVrEZ3wtyY0WMo5DU8=; b=f0W4gItDM5eADHjjxevoL4ttJcoRO1ebsQ0IEwQ70ZsllGRN2TslwbfWtCblYBVvGk hS3nH3nNCh9bKZVJX7jCyCRoxtWEUQ6H3ZWOMuFprtz3i1itG1zTjFFDkMVvfpp7YqS6 1U/QbxhU90GbhEmWz2lvjYuzjYM7K3lLl13BN9ZYZRGh+yfc6SKTrq5AF1ZeLqKz7cof rXdlmva6uqoqzi0WgY/ymRN9IzXJgQLK/B0eZUtresDFEJesyHjLjYOcz2/v35+NB3pw ZCfL371YYRAQ4Fan5gTYyXhjIcCaRAWa180A0fk6m34Ea4IuZafOdpMi0P9HRhogbmLP o8QA== X-Gm-Message-State: AOJu0YwkU68C9MMZNMqlq/mM/ZEt94eAm4D6YR8b6mv51NggnnD4tCH/ 8oB4TWY7M/Cb8yb4PjX1sdh48h7kif6GV3wGTp76jNWP9cxdcotf X-Received: by 2002:a17:902:9a0a:b0:1d8:b798:dfe3 with SMTP id v10-20020a1709029a0a00b001d8b798dfe3mr3573244plp.43.1706605995565; Tue, 30 Jan 2024 01:13:15 -0800 (PST) Received: from localhost (dhcp-141-239-144-21.hawaiiantel.net. [141.239.144.21]) by smtp.gmail.com with ESMTPSA id ki3-20020a170903068300b001d8e7db131fsm2895967plb.11.2024.01.30.01.13.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jan 2024 01:13:15 -0800 (PST) Sender: Tejun Heo From: Tejun Heo To: torvalds@linux-foundation.org, mpatocka@redhat.com Cc: linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev, msnitzer@redhat.com, ignat@cloudflare.com, damien.lemoal@wdc.com, bob.liu@oracle.com, houtao1@huawei.com, peterz@infradead.org, mingo@kernel.org, netdev@vger.kernel.org, allen.lkml@gmail.com, kernel-team@meta.com, Tejun Heo , Alasdair Kergon , Mike Snitzer Subject: [PATCH 7/8] dm-crypt: Convert from tasklet to BH workqueue Date: Mon, 29 Jan 2024 23:11:54 -1000 Message-ID: <20240130091300.2968534-8-tj@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240130091300.2968534-1-tj@kernel.org> References: <20240130091300.2968534-1-tj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789508640034633751 X-GMAIL-MSGID: 1789508640034633751 The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This patch converts dm-crypt from tasklet to BH workqueue. Like a regular workqueue, a BH workqueue allows freeing the currently executing work item. Converting from tasklet to BH workqueue removes the need for deferring bio_endio() again to a work item, which was buggy anyway. I tested this lightly with "--perf-no_read_workqueue --perf-no_write_workqueue" + some code modifications, but would really -appreciate if someone who knows the code base better could take a look. Signed-off-by: Tejun Heo Link: http://lkml.kernel.org/r/82b964f0-c2c8-a2c6-5b1f-f3145dc2c8e5@redhat.com Cc: Mikulas Patocka Cc: Linus Torvalds Cc: Alasdair Kergon Cc: Mike Snitzer Cc: dm-devel@lists.linux.dev Reviewed-by: Mikulas Patocka --- drivers/md/dm-crypt.c | 36 ++---------------------------------- 1 file changed, 2 insertions(+), 34 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 855b482cbff1..619c762d4072 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -73,11 +73,8 @@ struct dm_crypt_io { struct bio *base_bio; u8 *integrity_metadata; bool integrity_metadata_from_pool:1; - bool in_tasklet:1; struct work_struct work; - struct tasklet_struct tasklet; - struct convert_context ctx; atomic_t io_pending; @@ -1762,7 +1759,6 @@ static void crypt_io_init(struct dm_crypt_io *io, struct crypt_config *cc, io->ctx.r.req = NULL; io->integrity_metadata = NULL; io->integrity_metadata_from_pool = false; - io->in_tasklet = false; atomic_set(&io->io_pending, 0); } @@ -1771,13 +1767,6 @@ static void crypt_inc_pending(struct dm_crypt_io *io) atomic_inc(&io->io_pending); } -static void kcryptd_io_bio_endio(struct work_struct *work) -{ - struct dm_crypt_io *io = container_of(work, struct dm_crypt_io, work); - - bio_endio(io->base_bio); -} - /* * One of the bios was finished. Check for completion of * the whole request and correctly clean up the buffer. @@ -1800,21 +1789,6 @@ static void crypt_dec_pending(struct dm_crypt_io *io) kfree(io->integrity_metadata); base_bio->bi_status = error; - - /* - * If we are running this function from our tasklet, - * we can't call bio_endio() here, because it will call - * clone_endio() from dm.c, which in turn will - * free the current struct dm_crypt_io structure with - * our tasklet. In this case we need to delay bio_endio() - * execution to after the tasklet is done and dequeued. - */ - if (io->in_tasklet) { - INIT_WORK(&io->work, kcryptd_io_bio_endio); - queue_work(cc->io_queue, &io->work); - return; - } - bio_endio(base_bio); } @@ -2246,11 +2220,6 @@ static void kcryptd_crypt(struct work_struct *work) kcryptd_crypt_write_convert(io); } -static void kcryptd_crypt_tasklet(unsigned long work) -{ - kcryptd_crypt((struct work_struct *)work); -} - static void kcryptd_queue_crypt(struct dm_crypt_io *io) { struct crypt_config *cc = io->cc; @@ -2263,9 +2232,8 @@ static void kcryptd_queue_crypt(struct dm_crypt_io *io) * it is being executed with irqs disabled. */ if (in_hardirq() || irqs_disabled()) { - io->in_tasklet = true; - tasklet_init(&io->tasklet, kcryptd_crypt_tasklet, (unsigned long)&io->work); - tasklet_schedule(&io->tasklet); + INIT_WORK(&io->work, kcryptd_crypt); + queue_work(system_bh_wq, &io->work); return; }