From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 0E82DC2D0A3 for ; Tue, 3 Nov 2020 13:31:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A451D20786 for ; Tue, 3 Nov 2020 13:31:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="npoTGx50" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729252AbgKCNb3 (ORCPT ); Tue, 3 Nov 2020 08:31:29 -0500 Received: from mx2.suse.de ([195.135.220.15]:44192 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729043AbgKCNb0 (ORCPT ); Tue, 3 Nov 2020 08:31:26 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604410285; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fBsh8AS/ePYnb31EdT6vVpaN4yojvxK7Yfk/f//2g9g=; b=npoTGx5019ZSKU1MGSdHiswC4tujdpYUyFoH2g2WzAQTPNhZsx8VIPmAkMtHkigBp4nkcl FLuUjNoRDJ+iGSdXvfLNh/jpIDT/uWtwKn1yw3nCunj/pGXyeflHbjeM0CsR1gvsOsfo6g r3VsI+lmJdEMjGhsrD67AadiIbWii7Q= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 5FB1FABF4; Tue, 3 Nov 2020 13:31:25 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: Nikolay Borisov , David Sterba Subject: [PATCH 03/32] btrfs: extent_io: add lockdep_assert_held() for attach_extent_buffer_page() Date: Tue, 3 Nov 2020 21:30:39 +0800 Message-Id: <20201103133108.148112-4-wqu@suse.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103133108.148112-1-wqu@suse.com> References: <20201103133108.148112-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org When calling attach_extent_buffer_page(), either we're attaching anonymous pages, called from btrfs_clone_extent_buffer(). Or we're attaching btree_inode pages, called from alloc_extent_buffer(). For the later case, we should have page->mapping->private_lock hold to avoid race modifying page->private. Add lockdep_assert_held() if we're calling from alloc_extent_buffer(). Signed-off-by: Qu Wenruo Reviewed-by: Nikolay Borisov Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 228bf0c5f7a0..9cbce0b74db7 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3093,6 +3093,15 @@ static int submit_extent_page(unsigned int opf, static void attach_extent_buffer_page(struct extent_buffer *eb, struct page *page) { + /* + * If the page is mapped to btree inode, we should hold the private + * lock to prevent race. + * For cloned or dummy extent buffers, their pages are not mapped and + * will not race with any other ebs. + */ + if (page->mapping) + lockdep_assert_held(&page->mapping->private_lock); + if (!PagePrivate(page)) attach_page_private(page, eb); else -- 2.29.2