Merge branch 'writeback-for-2.6.34' into nfs-for-2.6.34

1 files changed, 67 insertions, 43 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index de7a194a64ab..88fd8c5877ee 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -278,31 +278,31 @@ static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 
 static int snmp6_alloc_dev(struct inet6_dev *idev)
 {
-        if (snmp_mib_init((void **)idev->stats.ipv6,
+        if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
                           sizeof(struct ipstats_mib)) < 0)
                 goto err_ip;
-        if (snmp_mib_init((void **)idev->stats.icmpv6,
+        if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
                           sizeof(struct icmpv6_mib)) < 0)
                 goto err_icmp;
-        if (snmp_mib_init((void **)idev->stats.icmpv6msg,
+        if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
                           sizeof(struct icmpv6msg_mib)) < 0)
                 goto err_icmpmsg;
 
         return 0;
 
 err_icmpmsg:
-        snmp_mib_free((void **)idev->stats.icmpv6);
+        snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 err_icmp:
-        snmp_mib_free((void **)idev->stats.ipv6);
+        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 err_ip:
         return -ENOMEM;
 }
 
 static void snmp6_free_dev(struct inet6_dev *idev)
 {
-        snmp_mib_free((void **)idev->stats.icmpv6msg);
-        snmp_mib_free((void **)idev->stats.icmpv6);
-        snmp_mib_free((void **)idev->stats.ipv6);
+        snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
+        snmp_mib_free((void __percpu **)idev->stats.icmpv6);
+        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 }
 
 /* Nobody refers to this device, we may destroy it. */
@@ -502,8 +502,11 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
         if (p == &net->ipv6.devconf_dflt->forwarding)
                 return 0;
 
-        if (!rtnl_trylock())
+        if (!rtnl_trylock()) {
+                /* Restore the original values before restarting */
+                *p = old;
                 return restart_syscall();
+        }
 
         if (p == &net->ipv6.devconf_all->forwarding) {
                 __s32 newf = net->ipv6.devconf_all->forwarding;
@@ -989,8 +992,7 @@ struct ipv6_saddr_dst {
 
 static inline int ipv6_saddr_preferred(int type)
 {
-        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
-                    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
+        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
                 return 1;
         return 0;
 }
@@ -2646,7 +2648,8 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
                 write_lock_bh(&addrconf_hash_lock);
                 while ((ifa = *bifa) != NULL) {
-                        if (ifa->idev == idev) {
+                        if (ifa->idev == idev &&
+                            (how || !(ifa->flags&IFA_F_PERMANENT))) {
                                 *bifa = ifa->lst_next;
                                 ifa->lst_next = NULL;
                                 addrconf_del_timer(ifa);
@@ -2686,18 +2689,30 @@ static int addrconf_ifdown(struct net_device *dev, int how)
                 write_lock_bh(&idev->lock);
         }
 #endif
-        while ((ifa = idev->addr_list) != NULL) {
-                idev->addr_list = ifa->if_next;
-                ifa->if_next = NULL;
-                ifa->dead = 1;
-                addrconf_del_timer(ifa);
-                write_unlock_bh(&idev->lock);
+        bifa = &idev->addr_list;
+        while ((ifa = *bifa) != NULL) {
+                if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
+                        /* Retain permanent address on admin down */
+                        bifa = &ifa->if_next;
+
+                        /* Restart DAD if needed when link comes back up */
+                        if ( !((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
+                               idev->cnf.accept_dad <= 0 ||
+                               (ifa->flags & IFA_F_NODAD)))
+                                ifa->flags |= IFA_F_TENTATIVE;
+                } else {
+                        *bifa = ifa->if_next;
+                        ifa->if_next = NULL;
 
-                __ipv6_ifa_notify(RTM_DELADDR, ifa);
-                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
-                in6_ifa_put(ifa);
+                        ifa->dead = 1;
+                        write_unlock_bh(&idev->lock);
 
-                write_lock_bh(&idev->lock);
+                        __ipv6_ifa_notify(RTM_DELADDR, ifa);
+                        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
+                        in6_ifa_put(ifa);
+
+                        write_lock_bh(&idev->lock);
+                }
         }
         write_unlock_bh(&idev->lock);
 
@@ -2789,14 +2804,14 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
         read_lock_bh(&idev->lock);
         if (ifp->dead)
                 goto out;
-        spin_lock_bh(&ifp->lock);
 
+        spin_lock(&ifp->lock);
         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
             idev->cnf.accept_dad < 1 ||
             !(ifp->flags&IFA_F_TENTATIVE) ||
             ifp->flags & IFA_F_NODAD) {
                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
-                spin_unlock_bh(&ifp->lock);
+                spin_unlock(&ifp->lock);
                 read_unlock_bh(&idev->lock);
 
                 addrconf_dad_completed(ifp);
@@ -2804,7 +2819,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
         }
 
         if (!(idev->if_flags & IF_READY)) {
-                spin_unlock_bh(&ifp->lock);
+                spin_unlock(&ifp->lock);
                 read_unlock_bh(&idev->lock);
                 /*
                  * If the device is not ready:
@@ -2824,7 +2839,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
                 ip6_ins_rt(ifp->rt);
 
         addrconf_dad_kick(ifp);
-        spin_unlock_bh(&ifp->lock);
+        spin_unlock(&ifp->lock);
 out:
         read_unlock_bh(&idev->lock);
 }
@@ -2840,14 +2855,15 @@ static void addrconf_dad_timer(unsigned long data)
                 read_unlock_bh(&idev->lock);
                 goto out;
         }
-        spin_lock_bh(&ifp->lock);
+
+        spin_lock(&ifp->lock);
         if (ifp->probes == 0) {
                 /*
                  * DAD was successful
                  */
 
                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
-                spin_unlock_bh(&ifp->lock);
+                spin_unlock(&ifp->lock);
                 read_unlock_bh(&idev->lock);
 
                 addrconf_dad_completed(ifp);
@@ -2857,7 +2873,7 @@ static void addrconf_dad_timer(unsigned long data)
 
         ifp->probes--;
         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
-        spin_unlock_bh(&ifp->lock);
+        spin_unlock(&ifp->lock);
         read_unlock_bh(&idev->lock);
 
         /* send a neighbour solicitation for our addr */
@@ -2905,12 +2921,12 @@ static void addrconf_dad_run(struct inet6_dev *idev) {
 
         read_lock_bh(&idev->lock);
         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
-                spin_lock_bh(&ifp->lock);
+                spin_lock(&ifp->lock);
                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
-                        spin_unlock_bh(&ifp->lock);
+                        spin_unlock(&ifp->lock);
                         continue;
                 }
-                spin_unlock_bh(&ifp->lock);
+                spin_unlock(&ifp->lock);
                 addrconf_dad_kick(ifp);
         }
         read_unlock_bh(&idev->lock);
@@ -3027,14 +3043,14 @@ static const struct file_operations if6_fops = {
         .release        = seq_release_net,
 };
 
-static int if6_proc_net_init(struct net *net)
+static int __net_init if6_proc_net_init(struct net *net)
 {
         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
                 return -ENOMEM;
         return 0;
 }
 
-static void if6_proc_net_exit(struct net *net)
+static void __net_exit if6_proc_net_exit(struct net *net)
 {
        proc_net_remove(net, "if_inet6");
 }
@@ -3752,8 +3768,8 @@ static inline size_t inet6_if_nlmsg_size(void)
                  );
 }
 
-static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
-                                      int bytes)
+static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
+                                      int items, int bytes)
 {
         int i;
         int pad = bytes - sizeof(u64) * items;
@@ -3772,10 +3788,10 @@ static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
 {
         switch(attrtype) {
         case IFLA_INET6_STATS:
-                __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
+                __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
                 break;
         case IFLA_INET6_ICMP6STATS:
-                __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
+                __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
                 break;
         }
 }
@@ -4028,12 +4044,15 @@ int addrconf_sysctl_forward(ctl_table *ctl, int write,
 {
         int *valp = ctl->data;
         int val = *valp;
+        loff_t pos = *ppos;
         int ret;
 
         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
 
         if (write)
                 ret = addrconf_fixup_forwarding(ctl, valp, val);
+        if (ret)
+                *ppos = pos;
         return ret;
 }
 
@@ -4075,8 +4094,11 @@ static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
                 return 0;
 
-        if (!rtnl_trylock())
+        if (!rtnl_trylock()) {
+                /* Restore the original values before restarting */
+                *p = old;
                 return restart_syscall();
+        }
 
         if (p == &net->ipv6.devconf_all->disable_ipv6) {
                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
@@ -4095,12 +4117,15 @@ int addrconf_sysctl_disable(ctl_table *ctl, int write,
 {
         int *valp = ctl->data;
         int val = *valp;
+        loff_t pos = *ppos;
         int ret;
 
         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
 
         if (write)
                 ret = addrconf_disable_ipv6(ctl, valp, val);
+        if (ret)
+                *ppos = pos;
         return ret;
 }
 
@@ -4402,8 +4427,7 @@ static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
 
 static void addrconf_sysctl_register(struct inet6_dev *idev)
 {
-        neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
-                              NET_IPV6_NEIGH, "ipv6",
+        neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
                               &ndisc_ifinfo_sysctl_change);
         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
                                         idev, &idev->cnf);
@@ -4418,7 +4442,7 @@ static void addrconf_sysctl_unregister(struct inet6_dev *idev)
 
 #endif
 
-static int addrconf_init_net(struct net *net)
+static int __net_init addrconf_init_net(struct net *net)
 {
         int err;
         struct ipv6_devconf *all, *dflt;
@@ -4467,7 +4491,7 @@ err_alloc_all:
         return err;
 }
 
-static void addrconf_exit_net(struct net *net)
+static void __net_exit addrconf_exit_net(struct net *net)
 {
 #ifdef CONFIG_SYSCTL
         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);