From patchwork Sat Nov 30 02:02:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu Kuai X-Patchwork-Id: 11267815 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 93D3B13A4 for ; Sat, 30 Nov 2019 01:41:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6FFA0215E5 for ; Sat, 30 Nov 2019 01:41:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727277AbfK3BlS (ORCPT ); Fri, 29 Nov 2019 20:41:18 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:39668 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727230AbfK3BlR (ORCPT ); Fri, 29 Nov 2019 20:41:17 -0500 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 6C92941332E05518ED29; Sat, 30 Nov 2019 09:41:15 +0800 (CST) Received: from huawei.com (10.175.124.28) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.439.0; Sat, 30 Nov 2019 09:41:07 +0800 From: yu kuai To: , , , , , , , , CC: , , , , , , Subject: [PATCH V2 1/3] dcache: add a new enum type for 'dentry_d_lock_class' Date: Sat, 30 Nov 2019 10:02:23 +0800 Message-ID: <20191130020225.20239-2-yukuai3@huawei.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20191130020225.20239-1-yukuai3@huawei.com> References: <20191130020225.20239-1-yukuai3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 'dentry_d_lock_class' can be used for spin_lock_nested in case lockdep confused about two different dentry take the 'd_lock'. However, a single 'DENTRY_D_LOCK_NESTED' may not be enough if more than two dentry are involed. So, add in 'DENTRY_D_LOCK_NESTED_TWICE'. Signed-off-by: yu kuai --- include/linux/dcache.h | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 10090f11ab95..830405b401ce 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -129,7 +129,16 @@ struct dentry { enum dentry_d_lock_class { DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */ - DENTRY_D_LOCK_NESTED + /* + * used by spin_lock_nested when two d_lock need to be taken + * at the same time + */ + DENTRY_D_LOCK_NESTED, + /* + * used by spin_lock_nested when three d_lock need to be taken + * at the same time + */ + DENTRY_D_LOCK_NESTED_TWICE }; struct dentry_operations {