From 9676f0c6389b62bd6b24d77d4b3abdbcfa32d0f2 Mon Sep 17 00:00:00 2001 From: Ram Pai Date: Mon, 7 Nov 2005 17:21:20 -0500 Subject: [PATCH] unbindable mounts An unbindable mount does not forward or receive propagation. Also unbindable mount disallows bind mounts. The semantics is as follows. Bind semantics: It is invalid to bind mount an unbindable mount. Move semantics: It is invalid to move an unbindable mount under shared mount. Clone-namespace semantics: If a mount is unbindable in the parent namespace, the corresponding cloned mount in the child namespace becomes unbindable too. Note: there is subtle difference, unbindable mounts cannot be bind mounted but can be cloned during clone-namespace. Signed-off-by: Ram Pai Signed-off-by: Al Viro Signed-off-by: Linus Torvalds --- fs/pnode.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/pnode.c') diff --git a/fs/pnode.c b/fs/pnode.c index 3e266c5a3071..aeeec8ba8dd2 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -82,6 +82,8 @@ void change_mnt_propagation(struct vfsmount *mnt, int type) if (type != MS_SLAVE) { list_del_init(&mnt->mnt_slave); mnt->mnt_master = NULL; + if (type == MS_UNBINDABLE) + mnt->mnt_flags |= MNT_UNBINDABLE; } } -- cgit v1.2.3