decnet: RCU conversion and get rid of dev_base_lock
While tracking dev_base_lock users, I found decnet used it in dnet_select_source(), but for a wrong purpose: Writers only hold RTNL, not dev_base_lock, so readers must use RCU if they cannot use RTNL. Adds an rcu_head in struct dn_ifaddr and handle proper RCU management. Adds __rcu annotation in dn_route as well. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
e4a7b93bd5
Коммит
fc766e4c49
|
@ -951,7 +951,7 @@ struct net_device {
|
|||
#endif
|
||||
void *atalk_ptr; /* AppleTalk link */
|
||||
struct in_device __rcu *ip_ptr; /* IPv4 specific data */
|
||||
void *dn_ptr; /* DECnet specific data */
|
||||
struct dn_dev __rcu *dn_ptr; /* DECnet specific data */
|
||||
struct inet6_dev __rcu *ip6_ptr; /* IPv6 specific data */
|
||||
void *ec_ptr; /* Econet specific data */
|
||||
void *ax25_ptr; /* AX.25 specific data */
|
||||
|
|
|
@ -5,13 +5,14 @@
|
|||
struct dn_dev;
|
||||
|
||||
struct dn_ifaddr {
|
||||
struct dn_ifaddr *ifa_next;
|
||||
struct dn_ifaddr __rcu *ifa_next;
|
||||
struct dn_dev *ifa_dev;
|
||||
__le16 ifa_local;
|
||||
__le16 ifa_address;
|
||||
__u8 ifa_flags;
|
||||
__u8 ifa_scope;
|
||||
char ifa_label[IFNAMSIZ];
|
||||
struct rcu_head rcu;
|
||||
};
|
||||
|
||||
#define DN_DEV_S_RU 0 /* Run - working normally */
|
||||
|
@ -83,7 +84,7 @@ struct dn_dev_parms {
|
|||
|
||||
|
||||
struct dn_dev {
|
||||
struct dn_ifaddr *ifa_list;
|
||||
struct dn_ifaddr __rcu *ifa_list;
|
||||
struct net_device *dev;
|
||||
struct dn_dev_parms parms;
|
||||
char use_long;
|
||||
|
@ -171,19 +172,27 @@ extern int unregister_dnaddr_notifier(struct notifier_block *nb);
|
|||
|
||||
static inline int dn_dev_islocal(struct net_device *dev, __le16 addr)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db;
|
||||
struct dn_ifaddr *ifa;
|
||||
int res = 0;
|
||||
|
||||
rcu_read_lock();
|
||||
dn_db = rcu_dereference(dev->dn_ptr);
|
||||
if (dn_db == NULL) {
|
||||
printk(KERN_DEBUG "dn_dev_islocal: Called for non DECnet device\n");
|
||||
return 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next)
|
||||
if ((addr ^ ifa->ifa_local) == 0)
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
for (ifa = rcu_dereference(dn_db->ifa_list);
|
||||
ifa != NULL;
|
||||
ifa = rcu_dereference(ifa->ifa_next))
|
||||
if ((addr ^ ifa->ifa_local) == 0) {
|
||||
res = 1;
|
||||
break;
|
||||
}
|
||||
out:
|
||||
rcu_read_unlock();
|
||||
return res;
|
||||
}
|
||||
|
||||
#endif /* _NET_DN_DEV_H */
|
||||
|
|
|
@ -94,10 +94,10 @@ struct dst_entry {
|
|||
int __use;
|
||||
unsigned long lastuse;
|
||||
union {
|
||||
struct dst_entry *next;
|
||||
struct rtable __rcu *rt_next;
|
||||
struct rt6_info *rt6_next;
|
||||
struct dn_route *dn_next;
|
||||
struct dst_entry *next;
|
||||
struct rtable __rcu *rt_next;
|
||||
struct rt6_info *rt6_next;
|
||||
struct dn_route __rcu *dn_next;
|
||||
};
|
||||
};
|
||||
|
||||
|
|
|
@ -1848,7 +1848,7 @@ unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
|
|||
{
|
||||
unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
|
||||
if (dev) {
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
mtu -= LL_RESERVED_SPACE(dev);
|
||||
if (dn_db->use_long)
|
||||
mtu -= 21;
|
||||
|
|
|
@ -267,7 +267,7 @@ static int dn_forwarding_proc(ctl_table *table, int write,
|
|||
if (table->extra1 == NULL)
|
||||
return -EINVAL;
|
||||
|
||||
dn_db = dev->dn_ptr;
|
||||
dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
old = dn_db->parms.forwarding;
|
||||
|
||||
err = proc_dointvec(table, write, buffer, lenp, ppos);
|
||||
|
@ -332,14 +332,19 @@ static struct dn_ifaddr *dn_dev_alloc_ifa(void)
|
|||
return ifa;
|
||||
}
|
||||
|
||||
static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
|
||||
static void dn_dev_free_ifa_rcu(struct rcu_head *head)
|
||||
{
|
||||
kfree(ifa);
|
||||
kfree(container_of(head, struct dn_ifaddr, rcu));
|
||||
}
|
||||
|
||||
static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
|
||||
static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
|
||||
{
|
||||
struct dn_ifaddr *ifa1 = *ifap;
|
||||
call_rcu(&ifa->rcu, dn_dev_free_ifa_rcu);
|
||||
}
|
||||
|
||||
static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
|
||||
{
|
||||
struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
|
||||
unsigned char mac_addr[6];
|
||||
struct net_device *dev = dn_db->dev;
|
||||
|
||||
|
@ -373,7 +378,9 @@ static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
|
|||
ASSERT_RTNL();
|
||||
|
||||
/* Check for duplicates */
|
||||
for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
|
||||
for (ifa1 = rtnl_dereference(dn_db->ifa_list);
|
||||
ifa1 != NULL;
|
||||
ifa1 = rtnl_dereference(ifa1->ifa_next)) {
|
||||
if (ifa1->ifa_local == ifa->ifa_local)
|
||||
return -EEXIST;
|
||||
}
|
||||
|
@ -386,7 +393,7 @@ static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
|
|||
}
|
||||
|
||||
ifa->ifa_next = dn_db->ifa_list;
|
||||
dn_db->ifa_list = ifa;
|
||||
rcu_assign_pointer(dn_db->ifa_list, ifa);
|
||||
|
||||
dn_ifaddr_notify(RTM_NEWADDR, ifa);
|
||||
blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
|
||||
|
@ -396,7 +403,7 @@ static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
|
|||
|
||||
static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
|
||||
int rv;
|
||||
|
||||
if (dn_db == NULL) {
|
||||
|
@ -425,7 +432,8 @@ int dn_dev_ioctl(unsigned int cmd, void __user *arg)
|
|||
struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
|
||||
struct dn_dev *dn_db;
|
||||
struct net_device *dev;
|
||||
struct dn_ifaddr *ifa = NULL, **ifap = NULL;
|
||||
struct dn_ifaddr *ifa = NULL;
|
||||
struct dn_ifaddr __rcu **ifap = NULL;
|
||||
int ret = 0;
|
||||
|
||||
if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
|
||||
|
@ -454,8 +462,10 @@ int dn_dev_ioctl(unsigned int cmd, void __user *arg)
|
|||
goto done;
|
||||
}
|
||||
|
||||
if ((dn_db = dev->dn_ptr) != NULL) {
|
||||
for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
|
||||
if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
|
||||
for (ifap = &dn_db->ifa_list;
|
||||
(ifa = rtnl_dereference(*ifap)) != NULL;
|
||||
ifap = &ifa->ifa_next)
|
||||
if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
|
||||
break;
|
||||
}
|
||||
|
@ -558,7 +568,7 @@ static struct dn_dev *dn_dev_by_index(int ifindex)
|
|||
|
||||
dev = __dev_get_by_index(&init_net, ifindex);
|
||||
if (dev)
|
||||
dn_dev = dev->dn_ptr;
|
||||
dn_dev = rtnl_dereference(dev->dn_ptr);
|
||||
|
||||
return dn_dev;
|
||||
}
|
||||
|
@ -576,7 +586,8 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|||
struct nlattr *tb[IFA_MAX+1];
|
||||
struct dn_dev *dn_db;
|
||||
struct ifaddrmsg *ifm;
|
||||
struct dn_ifaddr *ifa, **ifap;
|
||||
struct dn_ifaddr *ifa;
|
||||
struct dn_ifaddr __rcu **ifap;
|
||||
int err = -EINVAL;
|
||||
|
||||
if (!net_eq(net, &init_net))
|
||||
|
@ -592,7 +603,9 @@ static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|||
goto errout;
|
||||
|
||||
err = -EADDRNOTAVAIL;
|
||||
for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
|
||||
for (ifap = &dn_db->ifa_list;
|
||||
(ifa = rtnl_dereference(*ifap)) != NULL;
|
||||
ifap = &ifa->ifa_next) {
|
||||
if (tb[IFA_LOCAL] &&
|
||||
nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
|
||||
continue;
|
||||
|
@ -632,7 +645,7 @@ static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|||
if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
if ((dn_db = dev->dn_ptr) == NULL) {
|
||||
if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
|
||||
dn_db = dn_dev_create(dev, &err);
|
||||
if (!dn_db)
|
||||
return err;
|
||||
|
@ -748,11 +761,11 @@ static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
|
|||
skip_naddr = 0;
|
||||
}
|
||||
|
||||
if ((dn_db = dev->dn_ptr) == NULL)
|
||||
if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL)
|
||||
goto cont;
|
||||
|
||||
for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
|
||||
ifa = ifa->ifa_next, dn_idx++) {
|
||||
for (ifa = rtnl_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
|
||||
ifa = rtnl_dereference(ifa->ifa_next), dn_idx++) {
|
||||
if (dn_idx < skip_naddr)
|
||||
continue;
|
||||
|
||||
|
@ -773,21 +786,22 @@ done:
|
|||
|
||||
static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
|
||||
{
|
||||
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
|
||||
struct dn_dev *dn_db;
|
||||
struct dn_ifaddr *ifa;
|
||||
int rv = -ENODEV;
|
||||
|
||||
rcu_read_lock();
|
||||
dn_db = rcu_dereference(dev->dn_ptr);
|
||||
if (dn_db == NULL)
|
||||
goto out;
|
||||
|
||||
rtnl_lock();
|
||||
ifa = dn_db->ifa_list;
|
||||
ifa = rcu_dereference(dn_db->ifa_list);
|
||||
if (ifa != NULL) {
|
||||
*addr = ifa->ifa_local;
|
||||
rv = 0;
|
||||
}
|
||||
rtnl_unlock();
|
||||
out:
|
||||
rcu_read_unlock();
|
||||
return rv;
|
||||
}
|
||||
|
||||
|
@ -823,7 +837,7 @@ static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
|
|||
struct endnode_hello_message *msg;
|
||||
struct sk_buff *skb = NULL;
|
||||
__le16 *pktlen;
|
||||
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
|
||||
if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
|
||||
return;
|
||||
|
@ -889,7 +903,7 @@ static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn
|
|||
static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
|
||||
{
|
||||
int n;
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
|
||||
struct sk_buff *skb;
|
||||
size_t size;
|
||||
|
@ -960,7 +974,7 @@ static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
|
|||
|
||||
static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
|
||||
{
|
||||
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
|
||||
if (dn_db->parms.forwarding == 0)
|
||||
dn_send_endnode_hello(dev, ifa);
|
||||
|
@ -998,7 +1012,7 @@ static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
|
|||
|
||||
static int dn_eth_up(struct net_device *dev)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
|
||||
if (dn_db->parms.forwarding == 0)
|
||||
dev_mc_add(dev, dn_rt_all_end_mcast);
|
||||
|
@ -1012,7 +1026,7 @@ static int dn_eth_up(struct net_device *dev)
|
|||
|
||||
static void dn_eth_down(struct net_device *dev)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
|
||||
if (dn_db->parms.forwarding == 0)
|
||||
dev_mc_del(dev, dn_rt_all_end_mcast);
|
||||
|
@ -1025,12 +1039,16 @@ static void dn_dev_set_timer(struct net_device *dev);
|
|||
static void dn_dev_timer_func(unsigned long arg)
|
||||
{
|
||||
struct net_device *dev = (struct net_device *)arg;
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db;
|
||||
struct dn_ifaddr *ifa;
|
||||
|
||||
rcu_read_lock();
|
||||
dn_db = rcu_dereference(dev->dn_ptr);
|
||||
if (dn_db->t3 <= dn_db->parms.t2) {
|
||||
if (dn_db->parms.timer3) {
|
||||
for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
|
||||
for (ifa = rcu_dereference(dn_db->ifa_list);
|
||||
ifa;
|
||||
ifa = rcu_dereference(ifa->ifa_next)) {
|
||||
if (!(ifa->ifa_flags & IFA_F_SECONDARY))
|
||||
dn_db->parms.timer3(dev, ifa);
|
||||
}
|
||||
|
@ -1039,13 +1057,13 @@ static void dn_dev_timer_func(unsigned long arg)
|
|||
} else {
|
||||
dn_db->t3 -= dn_db->parms.t2;
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
dn_dev_set_timer(dev);
|
||||
}
|
||||
|
||||
static void dn_dev_set_timer(struct net_device *dev)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
|
||||
|
||||
if (dn_db->parms.t2 > dn_db->parms.t3)
|
||||
dn_db->parms.t2 = dn_db->parms.t3;
|
||||
|
@ -1077,8 +1095,8 @@ static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
|
|||
return NULL;
|
||||
|
||||
memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
|
||||
smp_wmb();
|
||||
dev->dn_ptr = dn_db;
|
||||
|
||||
rcu_assign_pointer(dev->dn_ptr, dn_db);
|
||||
dn_db->dev = dev;
|
||||
init_timer(&dn_db->timer);
|
||||
|
||||
|
@ -1086,7 +1104,7 @@ static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
|
|||
|
||||
dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
|
||||
if (!dn_db->neigh_parms) {
|
||||
dev->dn_ptr = NULL;
|
||||
rcu_assign_pointer(dev->dn_ptr, NULL);
|
||||
kfree(dn_db);
|
||||
return NULL;
|
||||
}
|
||||
|
@ -1125,7 +1143,7 @@ void dn_dev_up(struct net_device *dev)
|
|||
struct dn_ifaddr *ifa;
|
||||
__le16 addr = decnet_address;
|
||||
int maybe_default = 0;
|
||||
struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
|
||||
|
||||
if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
|
||||
return;
|
||||
|
@ -1176,7 +1194,7 @@ void dn_dev_up(struct net_device *dev)
|
|||
|
||||
static void dn_dev_delete(struct net_device *dev)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
|
||||
|
||||
if (dn_db == NULL)
|
||||
return;
|
||||
|
@ -1204,13 +1222,13 @@ static void dn_dev_delete(struct net_device *dev)
|
|||
|
||||
void dn_dev_down(struct net_device *dev)
|
||||
{
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
|
||||
struct dn_ifaddr *ifa;
|
||||
|
||||
if (dn_db == NULL)
|
||||
return;
|
||||
|
||||
while((ifa = dn_db->ifa_list) != NULL) {
|
||||
while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
|
||||
dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
|
||||
dn_dev_free_ifa(ifa);
|
||||
}
|
||||
|
@ -1270,7 +1288,7 @@ static inline int is_dn_dev(struct net_device *dev)
|
|||
}
|
||||
|
||||
static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
|
||||
__acquires(rcu)
|
||||
__acquires(RCU)
|
||||
{
|
||||
int i;
|
||||
struct net_device *dev;
|
||||
|
@ -1313,7 +1331,7 @@ static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|||
}
|
||||
|
||||
static void dn_dev_seq_stop(struct seq_file *seq, void *v)
|
||||
__releases(rcu)
|
||||
__releases(RCU)
|
||||
{
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
@ -1340,7 +1358,7 @@ static int dn_dev_seq_show(struct seq_file *seq, void *v)
|
|||
struct net_device *dev = v;
|
||||
char peer_buf[DN_ASCBUF_LEN];
|
||||
char router_buf[DN_ASCBUF_LEN];
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
|
||||
|
||||
seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
|
||||
" %04hu %03d %02x %-10s %-7s %-7s\n",
|
||||
|
|
|
@ -610,10 +610,12 @@ static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
|
|||
/* Scan device list */
|
||||
rcu_read_lock();
|
||||
for_each_netdev_rcu(&init_net, dev) {
|
||||
dn_db = dev->dn_ptr;
|
||||
dn_db = rcu_dereference(dev->dn_ptr);
|
||||
if (dn_db == NULL)
|
||||
continue;
|
||||
for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
|
||||
for (ifa2 = rcu_dereference(dn_db->ifa_list);
|
||||
ifa2 != NULL;
|
||||
ifa2 = rcu_dereference(ifa2->ifa_next)) {
|
||||
if (ifa2->ifa_local == ifa->ifa_local) {
|
||||
found_it = 1;
|
||||
break;
|
||||
|
|
|
@ -391,7 +391,7 @@ int dn_neigh_router_hello(struct sk_buff *skb)
|
|||
write_lock(&neigh->lock);
|
||||
|
||||
neigh->used = jiffies;
|
||||
dn_db = (struct dn_dev *)neigh->dev->dn_ptr;
|
||||
dn_db = rcu_dereference(neigh->dev->dn_ptr);
|
||||
|
||||
if (!(neigh->nud_state & NUD_PERMANENT)) {
|
||||
neigh->updated = jiffies;
|
||||
|
|
|
@ -93,7 +93,7 @@
|
|||
|
||||
struct dn_rt_hash_bucket
|
||||
{
|
||||
struct dn_route *chain;
|
||||
struct dn_route __rcu *chain;
|
||||
spinlock_t lock;
|
||||
};
|
||||
|
||||
|
@ -157,15 +157,17 @@ static inline void dnrt_drop(struct dn_route *rt)
|
|||
static void dn_dst_check_expire(unsigned long dummy)
|
||||
{
|
||||
int i;
|
||||
struct dn_route *rt, **rtp;
|
||||
struct dn_route *rt;
|
||||
struct dn_route __rcu **rtp;
|
||||
unsigned long now = jiffies;
|
||||
unsigned long expire = 120 * HZ;
|
||||
|
||||
for(i = 0; i <= dn_rt_hash_mask; i++) {
|
||||
for (i = 0; i <= dn_rt_hash_mask; i++) {
|
||||
rtp = &dn_rt_hash_table[i].chain;
|
||||
|
||||
spin_lock(&dn_rt_hash_table[i].lock);
|
||||
while((rt=*rtp) != NULL) {
|
||||
while ((rt = rcu_dereference_protected(*rtp,
|
||||
lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
|
||||
if (atomic_read(&rt->dst.__refcnt) ||
|
||||
(now - rt->dst.lastuse) < expire) {
|
||||
rtp = &rt->dst.dn_next;
|
||||
|
@ -186,17 +188,19 @@ static void dn_dst_check_expire(unsigned long dummy)
|
|||
|
||||
static int dn_dst_gc(struct dst_ops *ops)
|
||||
{
|
||||
struct dn_route *rt, **rtp;
|
||||
struct dn_route *rt;
|
||||
struct dn_route __rcu **rtp;
|
||||
int i;
|
||||
unsigned long now = jiffies;
|
||||
unsigned long expire = 10 * HZ;
|
||||
|
||||
for(i = 0; i <= dn_rt_hash_mask; i++) {
|
||||
for (i = 0; i <= dn_rt_hash_mask; i++) {
|
||||
|
||||
spin_lock_bh(&dn_rt_hash_table[i].lock);
|
||||
rtp = &dn_rt_hash_table[i].chain;
|
||||
|
||||
while((rt=*rtp) != NULL) {
|
||||
while ((rt = rcu_dereference_protected(*rtp,
|
||||
lockdep_is_held(&dn_rt_hash_table[i].lock))) != NULL) {
|
||||
if (atomic_read(&rt->dst.__refcnt) ||
|
||||
(now - rt->dst.lastuse) < expire) {
|
||||
rtp = &rt->dst.dn_next;
|
||||
|
@ -227,7 +231,7 @@ static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|||
{
|
||||
u32 min_mtu = 230;
|
||||
struct dn_dev *dn = dst->neighbour ?
|
||||
(struct dn_dev *)dst->neighbour->dev->dn_ptr : NULL;
|
||||
rcu_dereference_raw(dst->neighbour->dev->dn_ptr) : NULL;
|
||||
|
||||
if (dn && dn->use_long == 0)
|
||||
min_mtu -= 6;
|
||||
|
@ -277,13 +281,15 @@ static inline int compare_keys(struct flowi *fl1, struct flowi *fl2)
|
|||
|
||||
static int dn_insert_route(struct dn_route *rt, unsigned hash, struct dn_route **rp)
|
||||
{
|
||||
struct dn_route *rth, **rthp;
|
||||
struct dn_route *rth;
|
||||
struct dn_route __rcu **rthp;
|
||||
unsigned long now = jiffies;
|
||||
|
||||
rthp = &dn_rt_hash_table[hash].chain;
|
||||
|
||||
spin_lock_bh(&dn_rt_hash_table[hash].lock);
|
||||
while((rth = *rthp) != NULL) {
|
||||
while ((rth = rcu_dereference_protected(*rthp,
|
||||
lockdep_is_held(&dn_rt_hash_table[hash].lock))) != NULL) {
|
||||
if (compare_keys(&rth->fl, &rt->fl)) {
|
||||
/* Put it first */
|
||||
*rthp = rth->dst.dn_next;
|
||||
|
@ -315,15 +321,15 @@ static void dn_run_flush(unsigned long dummy)
|
|||
int i;
|
||||
struct dn_route *rt, *next;
|
||||
|
||||
for(i = 0; i < dn_rt_hash_mask; i++) {
|
||||
for (i = 0; i < dn_rt_hash_mask; i++) {
|
||||
spin_lock_bh(&dn_rt_hash_table[i].lock);
|
||||
|
||||
if ((rt = xchg(&dn_rt_hash_table[i].chain, NULL)) == NULL)
|
||||
if ((rt = xchg((struct dn_route **)&dn_rt_hash_table[i].chain, NULL)) == NULL)
|
||||
goto nothing_to_declare;
|
||||
|
||||
for(; rt; rt=next) {
|
||||
next = rt->dst.dn_next;
|
||||
rt->dst.dn_next = NULL;
|
||||
for(; rt; rt = next) {
|
||||
next = rcu_dereference_raw(rt->dst.dn_next);
|
||||
RCU_INIT_POINTER(rt->dst.dn_next, NULL);
|
||||
dst_free((struct dst_entry *)rt);
|
||||
}
|
||||
|
||||
|
@ -458,15 +464,16 @@ static int dn_return_long(struct sk_buff *skb)
|
|||
*/
|
||||
static int dn_route_rx_packet(struct sk_buff *skb)
|
||||
{
|
||||
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
||||
struct dn_skb_cb *cb;
|
||||
int err;
|
||||
|
||||
if ((err = dn_route_input(skb)) == 0)
|
||||
return dst_input(skb);
|
||||
|
||||
cb = DN_SKB_CB(skb);
|
||||
if (decnet_debug_level & 4) {
|
||||
char *devname = skb->dev ? skb->dev->name : "???";
|
||||
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
||||
|
||||
printk(KERN_DEBUG
|
||||
"DECnet: dn_route_rx_packet: rt_flags=0x%02x dev=%s len=%d src=0x%04hx dst=0x%04hx err=%d type=%d\n",
|
||||
(int)cb->rt_flags, devname, skb->len,
|
||||
|
@ -573,7 +580,7 @@ int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type
|
|||
struct dn_skb_cb *cb;
|
||||
unsigned char flags = 0;
|
||||
__u16 len = le16_to_cpu(*(__le16 *)skb->data);
|
||||
struct dn_dev *dn = (struct dn_dev *)dev->dn_ptr;
|
||||
struct dn_dev *dn = rcu_dereference(dev->dn_ptr);
|
||||
unsigned char padlen = 0;
|
||||
|
||||
if (!net_eq(dev_net(dev), &init_net))
|
||||
|
@ -728,7 +735,7 @@ static int dn_forward(struct sk_buff *skb)
|
|||
{
|
||||
struct dn_skb_cb *cb = DN_SKB_CB(skb);
|
||||
struct dst_entry *dst = skb_dst(skb);
|
||||
struct dn_dev *dn_db = dst->dev->dn_ptr;
|
||||
struct dn_dev *dn_db = rcu_dereference(dst->dev->dn_ptr);
|
||||
struct dn_route *rt;
|
||||
struct neighbour *neigh = dst->neighbour;
|
||||
int header_len;
|
||||
|
@ -835,13 +842,16 @@ static inline int dn_match_addr(__le16 addr1, __le16 addr2)
|
|||
static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int scope)
|
||||
{
|
||||
__le16 saddr = 0;
|
||||
struct dn_dev *dn_db = dev->dn_ptr;
|
||||
struct dn_dev *dn_db;
|
||||
struct dn_ifaddr *ifa;
|
||||
int best_match = 0;
|
||||
int ret;
|
||||
|
||||
read_lock(&dev_base_lock);
|
||||
for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
|
||||
rcu_read_lock();
|
||||
dn_db = rcu_dereference(dev->dn_ptr);
|
||||
for (ifa = rcu_dereference(dn_db->ifa_list);
|
||||
ifa != NULL;
|
||||
ifa = rcu_dereference(ifa->ifa_next)) {
|
||||
if (ifa->ifa_scope > scope)
|
||||
continue;
|
||||
if (!daddr) {
|
||||
|
@ -854,7 +864,7 @@ static __le16 dnet_select_source(const struct net_device *dev, __le16 daddr, int
|
|||
if (best_match == 0)
|
||||
saddr = ifa->ifa_local;
|
||||
}
|
||||
read_unlock(&dev_base_lock);
|
||||
rcu_read_unlock();
|
||||
|
||||
return saddr;
|
||||
}
|
||||
|
@ -1020,7 +1030,7 @@ source_ok:
|
|||
err = -ENODEV;
|
||||
if (dev_out == NULL)
|
||||
goto out;
|
||||
dn_db = dev_out->dn_ptr;
|
||||
dn_db = rcu_dereference_raw(dev_out->dn_ptr);
|
||||
/* Possible improvement - check all devices for local addr */
|
||||
if (dn_dev_islocal(dev_out, fl.fld_dst)) {
|
||||
dev_put(dev_out);
|
||||
|
@ -1233,7 +1243,7 @@ static int dn_route_input_slow(struct sk_buff *skb)
|
|||
|
||||
dev_hold(in_dev);
|
||||
|
||||
if ((dn_db = in_dev->dn_ptr) == NULL)
|
||||
if ((dn_db = rcu_dereference(in_dev->dn_ptr)) == NULL)
|
||||
goto out;
|
||||
|
||||
/* Zero source addresses are not allowed */
|
||||
|
@ -1677,15 +1687,15 @@ static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_rou
|
|||
{
|
||||
struct dn_rt_cache_iter_state *s = seq->private;
|
||||
|
||||
rt = rt->dst.dn_next;
|
||||
while(!rt) {
|
||||
rt = rcu_dereference_bh(rt->dst.dn_next);
|
||||
while (!rt) {
|
||||
rcu_read_unlock_bh();
|
||||
if (--s->bucket < 0)
|
||||
break;
|
||||
rcu_read_lock_bh();
|
||||
rt = dn_rt_hash_table[s->bucket].chain;
|
||||
rt = rcu_dereference_bh(dn_rt_hash_table[s->bucket].chain);
|
||||
}
|
||||
return rcu_dereference_bh(rt);
|
||||
return rt;
|
||||
}
|
||||
|
||||
static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
|
||||
|
|
Загрузка…
Ссылка в новой задаче