[PATCH] shared mount handling: bind and rbind

Implement handling of MS_BIND in presense of shared mounts (see
Documentation/sharedsubtree.txt in the end of patch series for detailed
description).

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/fs/pnode.h b/fs/pnode.h
index ab1bdaee4e08..c62c72fad212 100644
--- a/fs/pnode.h
+++ b/fs/pnode.h
@@ -12,7 +12,21 @@
 #include <linux/mount.h>
 
 #define IS_MNT_SHARED(mnt) (mnt->mnt_flags & MNT_SHARED)
+#define IS_MNT_NEW(mnt)  (!mnt->mnt_namespace)
 #define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~MNT_SHARED)
 
+#define CL_EXPIRE               0x01
+#define CL_COPY_ALL             0x04
+#define CL_MAKE_SHARED          0x08
+#define CL_PROPAGATION          0x10
+
+static inline void set_mnt_shared(struct vfsmount *mnt)
+{
+        mnt->mnt_flags &= ~MNT_PNODE_MASK;
+        mnt->mnt_flags |= MNT_SHARED;
+}
+
 void change_mnt_propagation(struct vfsmount *, int);
+int propagate_mnt(struct vfsmount *, struct dentry *, struct vfsmount *,
+                struct list_head *);
 #endif /* _LINUX_PNODE_H */