From patchwork Wed Jun 17 07:52:14 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kinglong Mee X-Patchwork-Id: 6622591 Return-Path: X-Original-To: patchwork-linux-fsdevel@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 35C449F1C1 for ; Wed, 17 Jun 2015 07:52:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 61E5920834 for ; Wed, 17 Jun 2015 07:52:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7015120836 for ; Wed, 17 Jun 2015 07:52:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757867AbbFQHwW (ORCPT ); Wed, 17 Jun 2015 03:52:22 -0400 Received: from mail-pd0-f173.google.com ([209.85.192.173]:34754 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757753AbbFQHwV (ORCPT ); Wed, 17 Jun 2015 03:52:21 -0400 Received: by pdbki1 with SMTP id ki1so32803793pdb.1; Wed, 17 Jun 2015 00:52:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=OEcOY0AQT4rMtM5BdVzrpE8NpydCUOSJBQDeiFZwdJQ=; b=fzgrTkyXJTabF8vnYwm//ElHTDNHpVVmNQl3gG7Aq3oPaSFubFnAw+ruUkYzb0QO/V dIHMFe3Vt4O1NAraiSCnEbz+4ONVyw0uzkxltmUSyoPtNDEpMNqYtfP6OlIBpM9H3V3C AxeFcKEH7nN3DuMRdmpJgBxJqSBgiHNNBq60Jdht2UDjPRUU7Q0V1cvoDBB3cpgfh4uG g2D38mDBGZSxSfI9PDvuB9fFtR1IkWeOW13DX3iAuJC1oAQ50+QELGaP2zSSes17ZKar cC4gXd4QUNRIVp5XeNbeonI/u9geio3ZlnyjHF0xr3qJGkgYC+Teq4qhdLbdKOa71K1Y PM2A== X-Received: by 10.70.96.36 with SMTP id dp4mr6108281pdb.65.1434527540776; Wed, 17 Jun 2015 00:52:20 -0700 (PDT) Received: from [192.168.99.30] ([104.143.41.79]) by mx.google.com with ESMTPSA id q4sm3704213pdo.42.2015.06.17.00.52.17 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 17 Jun 2015 00:52:20 -0700 (PDT) Message-ID: <5581272E.5040500@gmail.com> Date: Wed, 17 Jun 2015 15:52:14 +0800 From: Kinglong Mee User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Al Viro , "J. Bruce Fields" , "linux-nfs@vger.kernel.org" , linux-fsdevel@vger.kernel.org CC: NeilBrown , Trond Myklebust , kinglongmee@gmail.com Subject: [PATCH 4/6 v5] path: New helpers path_get_pin/path_put_unpin for path pin References: <5581266C.9080404@gmail.com> In-Reply-To: <5581266C.9080404@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable 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. v4, v5, same as v2. 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 fe30d3b..8f94e7c 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 + */ +void path_put_unpin(struct path *path, struct fs_pin *p) +{ + dput(path->dentry); + pin_remove(p); +} +EXPORT_SYMBOL(path_put_unpin); + struct nameidata { struct path path; struct qstr last; diff --git a/include/linux/path.h b/include/linux/path.h index d137218..34599fb 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 void 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;