NFS4_DEVICE_ID_HASH_SIZE
for (h = 0; h < NFS4_DEVICE_ID_HASH_SIZE; h++)
for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i ++){
#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
static struct hlist_head nfs4_deviceid_cache[NFS4_DEVICE_ID_HASH_SIZE];