Return-Path: 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 Message-ID: <5581272E.5040500@gmail.com> Date: Wed, 17 Jun 2015 15:52:14 +0800 From: Kinglong Mee 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> Content-Type: text/plain; charset=utf-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: 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; -- 2.4.3