boolean_t z_is_zvol; /* are we used by the zvol */
boolean_t z_is_mapped; /* are we mmap'ed */
boolean_t z_is_ctldir; /* are we .zfs entry */
+ boolean_t z_is_stale; /* are we stale due to rollback? */
struct inode z_inode; /* generic vfs inode */
} znode_t;