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>
---
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 c9ed64b..c10394d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -707,6 +707,9 @@ 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)
{
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
