From: Valerie Aurora <vaurora@xxxxxxxxxx>
Passing the CL_NO_SHARED flag to clone_mnt() causes the clone to fail
if the source mnt is shared.
Cc: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Valerie Aurora <valerie.aurora@xxxxxxxxx>
---
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 79be922..df604ea 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -596,6 +596,9 @@ 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)
{
--
1.7.0.4
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