From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valerie Aurora Subject: [PATCH 03/34] VFS: Add CL_NO_SLAVE flag to clone_mnt()/copy_tree() Date: Thu, 16 Sep 2010 15:11:54 -0700 Message-ID: <1284675145-4391-4-git-send-email-vaurora@redhat.com> References: <1284675145-4391-1-git-send-email-vaurora@redhat.com> Cc: Miklos Szeredi , Christoph Hellwig , Andreas Gruenbacher , Nick Piggin , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Valerie Aurora To: Alexander Viro Return-path: Received: from mx1.redhat.com ([209.132.183.28]:36696 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755623Ab0IPWOS (ORCPT ); Thu, 16 Sep 2010 18:14:18 -0400 In-Reply-To: <1284675145-4391-1-git-send-email-vaurora@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Passing the CL_NO_SLAVE flag to clone_mnt() causes the clone to fail if the source mnt is a slave. Signed-off-by: Valerie Aurora --- fs/namespace.c | 3 +++ fs/pnode.h | 1 + 2 files changed, 4 insertions(+), 0 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index eeb4c22..6956062 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -565,6 +565,9 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root, if ((flag & CL_NO_SHARED) && (IS_MNT_SHARED(old))) return ERR_PTR(-EINVAL); + if ((flag & CL_NO_SLAVE) && (IS_MNT_SLAVE(old))) + return ERR_PTR(-EINVAL); + mnt = alloc_vfsmnt(old->mnt_devname); if (!mnt) return ERR_PTR(-ENOMEM); diff --git a/fs/pnode.h b/fs/pnode.h index bcb3c47..8920e47 100644 --- a/fs/pnode.h +++ b/fs/pnode.h @@ -23,6 +23,7 @@ #define CL_MAKE_SHARED 0x08 #define CL_PRIVATE 0x10 #define CL_NO_SHARED 0x20 +#define CL_NO_SLAVE 0x40 static inline void set_mnt_shared(struct vfsmount *mnt) { -- 1.6.3.3