linux-kernel - [PATCH 02/34] VFS: Add CL_NO_SHARED flag to clone_mnt()/copy

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Message-Id: <1284675145-4391-3-git-send-email-vaurora@redhat.com>
Date:	Thu, 16 Sep 2010 15:11:53 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Nick Piggin <npiggin@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Valerie Aurora <vaurora@...hat.com>
Subject: [PATCH 02/34] VFS: Add CL_NO_SHARED flag to clone_mnt()/copy_tree()

Passing the CL_NO_SHARED flag to clone_mnt() causes the clone to fail
if the source mnt is shared.

Signed-off-by: Valerie Aurora <vaurora@...hat.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 5566524..eeb4c22 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -562,6 +562,9 @@ static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root,
 	struct vfsmount *mnt;
 	int err;
 
+	if ((flag & CL_NO_SHARED) && (IS_MNT_SHARED(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 1ea4ae1..bcb3c47 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -22,6 +22,7 @@
 #define CL_COPY_ALL 		0x04
 #define CL_MAKE_SHARED 		0x08
 #define CL_PRIVATE 		0x10
+#define CL_NO_SHARED 		0x20
 
 static inline void set_mnt_shared(struct vfsmount *mnt)
 {
-- 
1.6.3.3

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