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.h | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/pnode.h') diff --git a/fs/pnode.h b/fs/pnode.h index b59f0e9fe6b..020e1bb60fd 100644 --- a/fs/pnode.h +++ b/fs/pnode.h @@ -15,6 +15,7 @@ #define IS_MNT_SLAVE(mnt) (mnt->mnt_master) #define IS_MNT_NEW(mnt) (!mnt->mnt_namespace) #define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~MNT_SHARED) +#define IS_MNT_UNBINDABLE(mnt) (mnt->mnt_flags & MNT_UNBINDABLE) #define CL_EXPIRE 0x01 #define CL_SLAVE 0x02 -- cgit v1.2.3