[PATCH] bonding: add sysfs functionality to bonding (large)

This large patch adds sysfs functionality to the channel bonding module.
Bonds can be added, removed, and reconfigured at runtime without having
to reload the module.  Multiple bonds with different configurations are
easily configured, and ifenslave is no longer required to configure bonds.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Acked-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/bonding/Makefile

@@ -4,5 +4,5 @@
 
 obj-$(CONFIG_BONDING) += bonding.o
 
-bonding-objs := bond_main.o bond_3ad.o bond_alb.o
+bonding-objs := bond_main.o bond_3ad.o bond_alb.o bond_sysfs.o
 

drivers/net/bonding/bond_main.c

@@ -600,6 +600,7 @@ LIST_HEAD(bond_dev_list);
 static struct proc_dir_entry *bond_proc_dir = NULL;
 #endif
 
+extern struct rw_semaphore bonding_rwsem;
 static u32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
 static int arp_ip_count	= 0;
 static int bond_mode	= BOND_MODE_ROUNDROBIN;
@@ -1960,6 +1961,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 
 	write_unlock_bh(&bond->lock);
 
+	res = bond_create_slave_symlinks(bond_dev, slave_dev);
+	if (res)
+		goto err_unset_master;
+
 	printk(KERN_INFO DRV_NAME
 	       ": %s: enslaving %s as a%s interface with a%s link.\n",
 	       bond_dev->name, slave_dev->name,
@@ -2133,6 +2138,9 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
 
 	write_unlock_bh(&bond->lock);
 
+	/* must do this from outside any spinlocks */
+	bond_destroy_slave_symlinks(bond_dev, slave_dev);
+
 	bond_del_vlans_from_slave(bond, slave_dev);
 
 	/* If the mode USES_PRIMARY, then we should only remove its
@@ -2224,6 +2232,7 @@ static int bond_release_all(struct net_device *bond_dev)
 		 */
 		write_unlock_bh(&bond->lock);
 
+		bond_destroy_slave_symlinks(bond_dev, slave_dev);
 		bond_del_vlans_from_slave(bond, slave_dev);
 
 		/* If the mode USES_PRIMARY, then we should only remove its
@@ -3518,7 +3527,10 @@ static int bond_event_changename(struct bonding *bond)
 	bond_remove_proc_entry(bond);
 	bond_create_proc_entry(bond);
 #endif
-
+	down_write(&(bonding_rwsem));
+        bond_destroy_sysfs_entry(bond);
+        bond_create_sysfs_entry(bond);
+	up_write(&(bonding_rwsem));
 	return NOTIFY_DONE;
 }
 
@@ -3995,6 +4007,7 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
 		return -EPERM;
 	}
 
+	down_write(&(bonding_rwsem));
 	slave_dev = dev_get_by_name(ifr->ifr_slave);
 
 	dprintk("slave_dev=%p: \n", slave_dev);
@@ -4027,6 +4040,7 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
 		dev_put(slave_dev);
 	}
 
+	up_write(&(bonding_rwsem));
 	return res;
 }
 
@@ -4962,6 +4976,7 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
 		*newbond = bond_dev->priv;
 
 	rtnl_unlock(); /* allows sysfs registration of net device */
+	res = bond_create_sysfs_entry(bond_dev->priv);
 	goto done;
 out_bond:
 	bond_deinit(bond_dev);
@@ -4996,13 +5011,18 @@ static int __init bonding_init(void)
 			goto err;
 	}
 
+	res = bond_create_sysfs();
+	if (res)
+		goto err;
+
 	register_netdevice_notifier(&bond_netdev_notifier);
 	register_inetaddr_notifier(&bond_inetaddr_notifier);
 
 	goto out;
 err:
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 out:
 	return res;
@@ -5016,6 +5036,7 @@ static void __exit bonding_exit(void)
 
 	rtnl_lock();
 	bond_free_all();
+	bond_destroy_sysfs();
 	rtnl_unlock();
 }