Function cache_ncp_invalidate

freebsd/kern/vfs_cache.c:242–250

* Mark an entry as invalid. * * This is called before it starts getting deconstructed. */

 * This is called before it starts getting deconstructed.
 */
static void
cache_ncp_invalidate(struct namecache *ncp)
{

	KASSERT((ncp->nc_flag & NCF_INVALID) == 0,
	    ("%s: entry %p already invalid", __func__, ncp));
	atomic_store_char(&ncp->nc_flag, ncp->nc_flag | NCF_INVALID);
	atomic_thread_fence_rel();
}

/*
 * Check whether the entry can be safely used.