Function cache_enter_time

freebsd/kern/vfs_cache.c:2280–2479

* Add an entry to the cache. */

 * Add an entry to the cache.
 */
void
cache_enter_time(struct vnode *dvp, struct vnode *vp, struct componentname *cnp,
    struct timespec *tsp, struct timespec *dtsp)
{
	struct celockstate cel;
	struct namecache *ncp, *n2, *ndd;
	struct namecache_ts *ncp_ts;
	struct nchashhead *ncpp;
	uint32_t hash;
	int flag;
	int len;

	KASSERT(cnp->cn_namelen <= NAME_MAX,
	    ("%s: passed len %ld exceeds NAME_MAX (%d)", __func__, cnp->cn_namelen,
	    NAME_MAX));
	VNPASS(dvp != vp, dvp);
	VNPASS(!VN_IS_DOOMED(dvp), dvp);
	VNPASS(dvp->v_type != VNON, dvp);
	if (vp != NULL) {
		VNPASS(!VN_IS_DOOMED(vp), vp);
		VNPASS(vp->v_type != VNON, vp);
	}

#ifdef DEBUG_CACHE
	if (__predict_false(!doingcache))
		return;
#endif

	flag = 0;
	if (__predict_false(cnp->cn_nameptr[0] == '.')) {
		if (cnp->cn_namelen == 1)
			return;
		if (cnp->cn_namelen == 2 && cnp->cn_nameptr[1] == '.') {
			cache_enter_dotdot_prep(dvp, vp, cnp);
			flag = NCF_ISDOTDOT;
		}
	}

	ncp = cache_alloc(cnp->cn_namelen, tsp != NULL);
	if (ncp == NULL)
		return;

	cache_celockstate_init(&cel);
	ndd = NULL;
	ncp_ts = NULL;

	/*
	 * Calculate the hash key and setup as much of the new
	 * namecache entry as possible before acquiring the lock.
	 */
	ncp->nc_flag = flag | NCF_WIP;
	ncp->nc_vp = vp;
	if (vp == NULL)
		cache_neg_init(ncp);
	ncp->nc_dvp = dvp;
	if (tsp != NULL) {
		ncp_ts = __containerof(ncp, struct namecache_ts, nc_nc);
		ncp_ts->nc_time = *tsp;