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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b9-20020a056a000a8900b0057743e34597si23226859pfl.272.2023.01.13.16.34.57; Fri, 13 Jan 2023 16:35:09 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20210309 header.b=U8HIAYp7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231298AbjANAe1 (ORCPT + 99 others); Fri, 13 Jan 2023 19:34:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230174AbjANAeY (ORCPT ); Fri, 13 Jan 2023 19:34:24 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A1D17EC88; Fri, 13 Jan 2023 16:34:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=Q0DhLtU+AkZSwZWVqP0MPk6lq5PwplkxRc1b2XbXZDY=; b=U8HIAYp70e2ycRm22OJ+0wwcSx qspXP+fKa+fHfrWnigx792v+r1tyyu4L52yu58Dbv1bzKxuFA9bwafhEpFN0vOJEgxgmsWPwzM18v LDKi3RT8gqqhqlSJfI1XB7JK4DEFIUH6N7qzq8OHDl2f+W2RC2bSWfoA7kPIEZjvga92pbEQc9U7V mK2LG8e3/j+/nYXJcx6NWFreK82VrTYEEo0yzCQxoLHsozL0PbmDkPbWQMmQ2Hy4/MKtDVqkizawS sheJpbRvChiEazxuLSvC7I32DNTZMBEnK85c4EVF8IOoeseLemnLtFaRilevnFzuKEvD3TB2qQOwX l+DgBqgw==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGUUt-004twg-UF; Sat, 14 Jan 2023 00:34:11 +0000 From: Luis Chamberlain To: hch@infradead.org, djwong@kernel.org, song@kernel.org, rafael@kernel.org, gregkh@linuxfoundation.org, viro@zeniv.linux.org.uk, jack@suse.cz, bvanassche@acm.org, ebiederm@xmission.com Cc: mchehab@kernel.org, keescook@chromium.org, p.raghav@samsung.com, linux-fsdevel@vger.kernel.org, kernel@tuxforce.de, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Luis Chamberlain Subject: [RFC v3 23/24] lockd: replace kthread freezing with auto fs freezing Date: Fri, 13 Jan 2023 16:34:08 -0800 Message-Id: <20230114003409.1168311-24-mcgrof@kernel.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230114003409.1168311-1-mcgrof@kernel.org> References: <20230114003409.1168311-1-mcgrof@kernel.org> MIME-Version: 1.0 Sender: Luis Chamberlain X-Spam-Status: No, score=-4.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754956048208799523?= X-GMAIL-MSGID: =?utf-8?q?1754956048208799523?= The kernel power management now supports allowing the VFS to handle filesystem freezing freezes and thawing. Take advantage of that and remove the kthread freezing. This is needed so that we properly really stop IO in flight without races after userspace has been frozen. Without this we rely on kthread freezing and its semantics are loose and error prone. The filesystem therefore is in charge of properly dealing with quiescing of the filesystem through its callbacks if it thinks it knows better than how the VFS handles it. The following Coccinelle rule was used as to remove the now superflous freezer calls: spatch --sp-file fs-freeze-cleanup.cocci --in-place --timeout 120 --dir fs/lockd --jobs 12 --use-gitgrep @ remove_set_freezable @ expression time; statement S, S2; expression task, current; @@ ( - set_freezable(); | - if (try_to_freeze()) - continue; | - try_to_freeze(); | - freezable_schedule(); + schedule(); | - freezable_schedule_timeout(time); + schedule_timeout(time); | - if (freezing(task)) { S } | - if (freezing(task)) { S } - else { S2 } | - freezing(current) ) @ remove_wq_freezable @ expression WQ_E, WQ_ARG1, WQ_ARG2, WQ_ARG3, WQ_ARG4; identifier fs_wq_fn; @@ ( WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_FREEZABLE, + WQ_ARG2, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_FREEZABLE | WQ_ARG3, + WQ_ARG2 | WQ_ARG3, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_ARG3 | WQ_FREEZABLE, + WQ_ARG2 | WQ_ARG3, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_ARG3 | WQ_FREEZABLE | WQ_ARG4, + WQ_ARG2 | WQ_ARG3 | WQ_ARG4, ...); | WQ_E = - WQ_ARG1 | WQ_FREEZABLE + WQ_ARG1 | WQ_E = - WQ_ARG1 | WQ_FREEZABLE | WQ_ARG3 + WQ_ARG1 | WQ_ARG3 | fs_wq_fn( - WQ_FREEZABLE | WQ_ARG2 | WQ_ARG3 + WQ_ARG2 | WQ_ARG3 ) | fs_wq_fn( - WQ_FREEZABLE | WQ_ARG2 + WQ_ARG2 ) | fs_wq_fn( - WQ_FREEZABLE + 0 ) ) @ add_auto_flag @ expression E1; identifier fs_type; @@ struct file_system_type fs_type = { .fs_flags = E1 + | FS_AUTOFREEZE , }; Generated-by: Coccinelle SmPL Signed-off-by: Luis Chamberlain --- fs/lockd/clntproc.c | 1 - fs/lockd/svc.c | 3 --- 2 files changed, 4 deletions(-) diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index e875a3571c41..996f5b4d5d17 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -247,7 +247,6 @@ static int nlm_wait_on_grace(wait_queue_head_t *queue) prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); if (!signalled ()) { schedule_timeout(NLMCLNT_GRACE_WAIT); - try_to_freeze(); if (!signalled ()) status = 0; } diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c index e56d85335599..bfccbd6f20ed 100644 --- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -135,9 +135,6 @@ lockd(void *vrqstp) struct net *net = &init_net; struct lockd_net *ln = net_generic(net, lockd_net_id); - /* try_to_freeze() is called from svc_recv() */ - set_freezable(); - /* Allow SIGKILL to tell lockd to drop all of its locks */ allow_signal(SIGKILL);