From patchwork Mon Sep 7 14:04:05 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kinglong Mee X-Patchwork-Id: 7135591 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 155429F1CD for ; Mon, 7 Sep 2015 14:04:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 30CA62081B for ; Mon, 7 Sep 2015 14:04:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C2942060B for ; Mon, 7 Sep 2015 14:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752397AbbIGOES (ORCPT ); Mon, 7 Sep 2015 10:04:18 -0400 Received: from mail-pa0-f53.google.com ([209.85.220.53]:35374 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752394AbbIGOES (ORCPT ); Mon, 7 Sep 2015 10:04:18 -0400 Received: by pacfv12 with SMTP id fv12so100401313pac.2; Mon, 07 Sep 2015 07:04:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-type:content-transfer-encoding; bh=kX9EgJ4zcW70BJACVNaxPAAzCsiBRt3mnva7WmfREa0=; b=HW83LHctKHV3w8f93afWlOFfXBuXBd/yTvUJ9SoT7ISAipFC3AssvOqGfLVUVrhkfU HEMJ1lFazCgDIukXImnOSiKhhkUb6ceqmZ+axMP+1w422VYMk+YIh/o8YQ9r/AYb0GeR t5nQuMyx67hXtLjUhwlLnk2HOyQBCwSKuXmq1dex/uuqe4aOHp0O0sAmvHFwgdHMYK+u 56ZowtszQjVjad1pgRwmffVsqMmqU4h748dqFZzggfDw98yrik3Z7UlBdix4muDLzLco nc2RTXvEQYDIeXHhRfaz/Tiv5ULOg52/XE+MUAP+7VAsfs3Wql+1xMhcPTZLWW5Iq/xJ V2Pw== X-Received: by 10.68.134.169 with SMTP id pl9mr46434219pbb.164.1441634657676; Mon, 07 Sep 2015 07:04:17 -0700 (PDT) Received: from [192.168.99.8] ([104.143.41.79]) by smtp.googlemail.com with ESMTPSA id h7sm12168559pdl.86.2015.09.07.07.04.10 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Sep 2015 07:04:17 -0700 (PDT) Subject: [PATCH 3/6 v10] path: New helpers path_get_pin/path_put_unpin for path,pin To: "J. Bruce Fields" , Al Viro References: <55ED9899.9010401@gmail.com> Cc: "linux-nfs@vger.kernel.org" , linux-fsdevel@vger.kernel.org, NeilBrown , Trond Myklebust , kinglongmee@gmail.com From: Kinglong Mee Message-ID: <55ED9955.2040209@gmail.com> Date: Mon, 7 Sep 2015 22:04:05 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <55ED9899.9010401@gmail.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Two helpers for filesystem pining to vfsmnt, not mntget. v9, Update base on NeilBrown's new patch v10, same as v9 Signed-off-by: Kinglong Mee --- fs/namei.c | 26 ++++++++++++++++++++++++++ include/linux/path.h | 4 ++++ 2 files changed, 30 insertions(+) diff --git a/fs/namei.c b/fs/namei.c index 29b9279..3a5b0eb 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -492,6 +492,32 @@ void path_put(const struct path *path) } EXPORT_SYMBOL(path_put); +/** + * path_get_pin - get a reference to a path's dentry + * and pin to path's vfsmnt + * @path: path to get the reference to + * @p: the fs_pin pin to vfsmnt + */ +void path_get_pin(struct path *path, struct fs_pin *p) +{ + dget(path->dentry); + pin_insert_group(p, path->mnt, NULL); +} +EXPORT_SYMBOL(path_get_pin); + +/** + * path_put_unpin - put a reference to a path's dentry + * and remove pin to path's vfsmnt + * @path: path to put the reference to + * @p: the fs_pin removed from vfsmnt + */ +int path_put_unpin(struct path *path, struct fs_pin *p) +{ + dput(path->dentry); + return pin_remove(p); +} +EXPORT_SYMBOL(path_put_unpin); + #define EMBEDDED_LEVELS 2 struct nameidata { struct path path; diff --git a/include/linux/path.h b/include/linux/path.h index d137218..40d376a 100644 --- a/include/linux/path.h +++ b/include/linux/path.h @@ -3,6 +3,7 @@ struct dentry; struct vfsmount; +struct fs_pin; struct path { struct vfsmount *mnt; @@ -12,6 +13,9 @@ struct path { extern void path_get(const struct path *); extern void path_put(const struct path *); +extern void path_get_pin(struct path *, struct fs_pin *); +extern int path_put_unpin(struct path *, struct fs_pin *); + static inline int path_equal(const struct path *path1, const struct path *path2) { return path1->mnt == path2->mnt && path1->dentry == path2->dentry;