From patchwork Sat Jul 11 12:48:06 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kinglong Mee X-Patchwork-Id: 6770201 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 377E99F319 for ; Sat, 11 Jul 2015 12:48:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6B4E220501 for ; Sat, 11 Jul 2015 12:48:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ABAC52063A for ; Sat, 11 Jul 2015 12:48:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753135AbbGKMsT (ORCPT ); Sat, 11 Jul 2015 08:48:19 -0400 Received: from mail-pa0-f47.google.com ([209.85.220.47]:35811 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753112AbbGKMsS (ORCPT ); Sat, 11 Jul 2015 08:48:18 -0400 Received: by pactm7 with SMTP id tm7so182037863pac.2; Sat, 11 Jul 2015 05:48:18 -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=IE6aIf4dc1Z2uRhPJEFs4ygZkah/qzsTuiTdtaCVwJI=; b=R7QZ5aSVpfixUDrQFFAEnr2641wegSiBOFxpiWT105R1yZk+m3bdkkvy6aniUGb1GG Sr43D+48tqtm8ukyd/Wc/ZSSxpE3u9gVAmMr+W+NigoeVQEzZof+2uFMS5cP0DR49q4w wPorZuwBd/oWky19Tawy+ECScVDmgBj2IZyH35xXDR8EBFeWIV12DdsQaP6OLinS7SSN Vuqwor+DFc5hy4MuIkDQu6BojgZg6IeZA4XLuuStmkfGkUR8FZH9Rhj/VLJdkIDTdhDj EMTQMRMOiEp9brTypICaVzknrmR1i8aAtL9PkvpSKfRu0XHOJBRIorRR+f9gj0wLahxQ W35Q== X-Received: by 10.70.64.162 with SMTP id p2mr52085029pds.54.1436618898252; Sat, 11 Jul 2015 05:48:18 -0700 (PDT) Received: from [192.168.99.8] ([104.143.41.79]) by smtp.googlemail.com with ESMTPSA id j4sm2275748pdo.62.2015.07.11.05.48.13 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 11 Jul 2015 05:48:17 -0700 (PDT) Message-ID: <55A11086.1030305@gmail.com> Date: Sat, 11 Jul 2015 20:48:06 +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 03/10 v7] path: New helpers path_get_pin/path_put_unpin for path pin References: <55A11010.6050005@gmail.com> In-Reply-To: <55A11010.6050005@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=-7.3 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, v6, v7 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 ae4e4c1..08f2cfc 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); + #define EMBEDDED_LEVELS 2 struct nameidata { struct path path; 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;