struct cache_head {
struct hlist_node cache_list;
time_t expiry_time; /* After time time, don't use the data */
- time_t last_refresh; /* If CACHE_PENDING, this is when upcall
- * was sent, else this is when update was received
+ time_t last_refresh; /* If CACHE_PENDING, this is when upcall was
+ * sent, else this is when update was
+ * received, though it is alway set to
+ * be *after* ->flush_time.
*/
struct kref ref;
unsigned long flags;
/* fields below this comment are for internal use
* and should not be touched by cache owners
*/
- time_t flush_time; /* flush all cache items with last_refresh
- * earlier than this */
+ time_t flush_time; /* flush all cache items with
+ * last_refresh at or earlier
+ * than this. last_refresh
+ * is never set at or earlier
+ * than this.
+ */
struct list_head others;
time_t nextcheck;
int entries;
static inline int cache_is_expired(struct cache_detail *detail, struct cache_head *h)
{
return (h->expiry_time < seconds_since_boot()) ||
- (detail->flush_time > h->last_refresh);
+ (detail->flush_time >= h->last_refresh);
}
extern int cache_check(struct cache_detail *detail,