DBUF_MUTEXES
for (i = 0; i < DBUF_MUTEXES; i++)
for (i = 0; i < DBUF_MUTEXES; i++)
#define DBUF_HASH_MUTEX(h, idx) (&(h)->hash_mutexes[(idx) & (DBUF_MUTEXES-1)])
kmutex_t hash_mutexes[DBUF_MUTEXES];