On Tue, Feb 21, 2012 at 05:58:25PM +0000, David Howells wrote:
> 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.
>
> Original-author: Valerie Aurora <vaurora@xxxxxxxxxx>
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> Cc: Ram Pai <linuxram@xxxxxxxxxx>
Reviewed-by: Ram Pai <linuxram@xxxxxxxxxx>
> ---
>
> 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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