linux-kernel - [PATCH 09/73] VFS: Add CL_NO_SLAVE flag to clone_mnt()/copy

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Date:	Tue, 21 Feb 2012 17:58:32 +0000
From:	David Howells <dhowells@...hat.com>
To:	linux-fsdevel@...r.kernel.org, viro@...IV.linux.org.uk,
	valerie.aurora@...il.com
Cc:	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: [PATCH 09/73] VFS: Add CL_NO_SLAVE flag to clone_mnt()/copy_tree()
 [ver #2]

From: Valerie Aurora <vaurora@...hat.com>

Passing the CL_NO_SLAVE flag to clone_mnt() causes the clone
to fail if the source mnt is a slave.

Original-author: Valerie Aurora <vaurora@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Cc: Ram Pai <linuxram@...ibm.com>
---

 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 f92f574..96f43f2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -743,6 +743,9 @@ static struct mount *clone_mnt(struct mount *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 c7089dd..f7ae149 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 mount *mnt)
 {

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