From patchwork Sat Jun 6 14:41:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kinglong Mee X-Patchwork-Id: 6559721 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 47221C0020 for ; Sat, 6 Jun 2015 14:42:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 451F92062B for ; Sat, 6 Jun 2015 14:42:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5A0A320628 for ; Sat, 6 Jun 2015 14:42:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932308AbbFFOlx (ORCPT ); Sat, 6 Jun 2015 10:41:53 -0400 Received: from mail-qc0-f194.google.com ([209.85.216.194]:35271 "EHLO mail-qc0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751804AbbFFOlw (ORCPT ); Sat, 6 Jun 2015 10:41:52 -0400 X-Greylist: delayed 3817 seconds by postgrey-1.27 at vger.kernel.org; Sat, 06 Jun 2015 10:41:52 EDT Received: by qcvp6 with SMTP id p6so4424627qcv.2; Sat, 06 Jun 2015 07:41:51 -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 :content-type:content-transfer-encoding; bh=ekh7moPTBhi0JgxFRJDyPo3rvZRn/aQHQw4vrgfzWnY=; b=N8zuCWkNA+rl1Phoc0aHLpwxAfQMXWe6JjsiXuExbRynhF1z37sc2C6D2Xe95aIhXg p7fkDVrJ9GTFmj77/zFHtELy1YQ1Qnb8CIBR7joyrpnso/gOXEmN0R4VwhotN+DLUW22 gUlmzFXgyTEgZJkOoT8xx7JqxOfXZKKq7sZ/KvTj8B3khvFLOYCn+FsNQ4PuGGi0+9Vy rCxBR1N68yM7WZYYFKoBcuCz/o5TNaWN3t0we+TtQyQOuByilueDDxLwrog8YR/MoJ4h wZC6E10qDBxc8vz1mjzMOIQR3uZdb16BuQaxP53KeQ2IqZhruNUzYxQMgAqBiAPjbVhw eg5A== X-Received: by 10.55.33.147 with SMTP id f19mr16274199qki.92.1433601711559; Sat, 06 Jun 2015 07:41:51 -0700 (PDT) Received: from [192.168.99.5] ([104.143.41.79]) by mx.google.com with ESMTPSA id c73sm4233361qka.24.2015.06.06.07.41.48 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 06 Jun 2015 07:41:51 -0700 (PDT) Message-ID: <557306A9.3060808@gmail.com> Date: Sat, 06 Jun 2015 22:41:45 +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-fsdevel@vger.kernel.org, "linux-nfs@vger.kernel.org" CC: NeilBrown , Trond Myklebust , kinglongmee@gmail.com Subject: [PATCH 3/5 v4] path: New helpers path_get_pin/path_put_unpin for path pin Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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=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, 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;