dirfs_node
TAILQ_ENTRY(dirfs_node) dn_fdentry; /* Passive fd cache */
RB_ENTRY(dirfs_node) dn_rbentry; /* Inode no. lookup */
struct dirfs_node * dn_parent; /* Pointer to parent node */
typedef struct dirfs_node *dirfs_node_t;
TAILQ_HEAD(, dirfs_node) dm_fdlist;