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Subject[PATCH 08/73] VFS: Add CL_NO_SHARED flag to clone_mnt()/copy_tree() [ver #2]
Date
From: Valerie Aurora <vaurora@redhat.com>

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

Original-author: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Ram Pai <linuxram@us.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 35c3b80..f92f574 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -740,6 +740,9 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
struct mount *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 65c6097..c7089dd 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 mount *mnt)
{


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