ReadOnly
bool ReadOnly;
bool ReadOnly;
#define NDevReadOnly(nd) test_ndev_flag(nd, ReadOnly)
#define NDevSetReadOnly(nd) set_ndev_flag(nd, ReadOnly)
#define NDevClearReadOnly(nd) clear_ndev_flag(nd, ReadOnly)
#define NVolReadOnly(nv) test_nvol_flag(nv, ReadOnly)
#define NVolSetReadOnly(nv) set_nvol_flag(nv, ReadOnly)
#define NVolClearReadOnly(nv) clear_nvol_flag(nv, ReadOnly)