| Date | Wed, 29 Feb 2012 14:56:16 +0800 | From | Ram Pai <> | Subject | Re: [PATCH 08/73] VFS: Add CL_NO_SHARED flag to clone_mnt()/copy_tree() [ver #2] |
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On Tue, Feb 21, 2012 at 05:58:25PM +0000, David Howells wrote: > 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>
Reviewed-by: 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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