From patchwork Sat Jan 14 00:33:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 13101763 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 7A3F4C6379F for ; Sat, 14 Jan 2023 00:34:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230209AbjANAem (ORCPT ); Fri, 13 Jan 2023 19:34:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231274AbjANAe0 (ORCPT ); Fri, 13 Jan 2023 19:34:26 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 206988A238; Fri, 13 Jan 2023 16:34:25 -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=NPqmUbze7tVU9yxfor+E05Nfa//Qc3g2dTNg8M8Gl8g=; b=Ru792/qbkg4zXjTFORz18792go rz71T2fvMYuTK2A0MWrKUM7yUtzSN2TCj3AcqE9XkNQbICSlnId0BEUn4nsOgREmXAGq0AREuYStk T/5v4bEZl+QOBz0no+vXwwr6EN1ZeA7eg6eW8g6YXqjFdqNqs8XtfXTeDDVawYbTPoX7e3CR6obXY wqH0GDt+F3oyi91TMgDFPj56fHI5voXFl07uPnNuhGdEQBjRbEhRpMEbhmX9bt+cct/uTna5TnQyf Ma85KSIz111Ml2bQ6J2bt9Ceg92/FUY20D3K06pcgZ844gSCOt24hLSlIRx3As36QivsoM92GukE0 vdViqwEA==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGUUt-004twD-9G; 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 09/24] f2fs: replace kthread freezing with auto fs freezing Date: Fri, 13 Jan 2023 16:33:54 -0800 Message-Id: <20230114003409.1168311-10-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 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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/f2fs --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/f2fs/gc.c | 3 +-- fs/f2fs/segment.c | 6 +----- fs/f2fs/super.c | 2 +- 3 files changed, 3 insertions(+), 8 deletions(-) diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index 8eac3042786b..627a7ea95851 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -42,12 +42,11 @@ static int gc_thread_func(void *data) wait_ms = gc_th->min_sleep_time; - set_freezable(); do { bool sync_mode, foreground = false; wait_event_interruptible_timeout(*wq, - kthread_should_stop() || freezing(current) || + kthread_should_stop() || waitqueue_active(fggc_wq) || gc_th->gc_wake, msecs_to_jiffies(wait_ms)); diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index e2f95f46d298..11cad5287047 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1682,11 +1682,9 @@ static int issue_discard_thread(void *data) unsigned int wait_ms = dcc->min_discard_issue_time; int issued; - set_freezable(); - do { wait_event_interruptible_timeout(*q, - kthread_should_stop() || freezing(current) || + kthread_should_stop() || dcc->discard_wake, msecs_to_jiffies(wait_ms)); @@ -1704,8 +1702,6 @@ static int issue_discard_thread(void *data) if (atomic_read(&dcc->queued_discard)) __wait_all_discard_cmd(sbi, NULL); - if (try_to_freeze()) - continue; if (f2fs_readonly(sbi->sb)) continue; if (kthread_should_stop()) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 87d56a9883e6..e9c6fb04c713 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -4645,7 +4645,7 @@ static struct file_system_type f2fs_fs_type = { .name = "f2fs", .mount = f2fs_mount, .kill_sb = kill_f2fs_super, - .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP | FS_AUTOFREEZE, }; MODULE_ALIAS_FS("f2fs");