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Date: Thu, 13 Oct 2011 00:56:25 -0700
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Greg Kroah-Hartman <gregkh@...e.de>,
David Miller <davem@...emloft.net>
Cc: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
Tejun Heo <htejun@...il.com>, Jay Vosburgh <fubar@...ibm.com>,
Andy Gospodarek <andy@...yhouse.net>
Subject: [PATCH 3/5] bonding: Use a per netns implementation of /sys/class/net/bonding_masters.
This fixes a network namespace misfeature that bonding_masters looked at
current instead of the remembering the context where in which
/sys/class/net/bonding_masters was opened in to see which network
namespace to act upon.
This removes the need for sysfs to handle tagged directories with
untagged members allowing for a conceptually simpler sysfs
implementation.
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
drivers/net/bonding/bond_main.c | 7 +----
drivers/net/bonding/bond_sysfs.c | 45 ++++++++++++++++++++++++++-----------
drivers/net/bonding/bonding.h | 7 ++++-
3 files changed, 38 insertions(+), 21 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 6d79b78..e084b1c 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4898,6 +4898,7 @@ static int __net_init bond_net_init(struct net *net)
INIT_LIST_HEAD(&bn->dev_list);
bond_create_proc_dir(bn);
+ bond_create_sysfs(bn);
return 0;
}
@@ -4906,6 +4907,7 @@ static void __net_exit bond_net_exit(struct net *net)
{
struct bond_net *bn = net_generic(net, bond_net_id);
+ bond_destroy_sysfs(bn);
bond_destroy_proc_dir(bn);
}
@@ -4943,10 +4945,6 @@ 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);
out:
@@ -4964,7 +4962,6 @@ static void __exit bonding_exit(void)
unregister_netdevice_notifier(&bond_netdev_notifier);
unregister_inetaddr_notifier(&bond_inetaddr_notifier);
- bond_destroy_sysfs();
bond_destroy_debugfs();
rtnl_link_unregister(&bond_link_ops);
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 2dfb4bf..6044ff8 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -55,8 +55,8 @@ static ssize_t bonding_show_bonds(struct class *cls,
struct class_attribute *attr,
char *buf)
{
- struct net *net = current->nsproxy->net_ns;
- struct bond_net *bn = net_generic(net, bond_net_id);
+ struct bond_net *bn =
+ container_of(attr, struct bond_net, class_attr_bonding_masters);
int res = 0;
struct bonding *bond;
@@ -79,9 +79,8 @@ static ssize_t bonding_show_bonds(struct class *cls,
return res;
}
-static struct net_device *bond_get_by_name(struct net *net, const char *ifname)
+static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
{
- struct bond_net *bn = net_generic(net, bond_net_id);
struct bonding *bond;
list_for_each_entry(bond, &bn->dev_list, bond_list) {
@@ -103,7 +102,8 @@ static ssize_t bonding_store_bonds(struct class *cls,
struct class_attribute *attr,
const char *buffer, size_t count)
{
- struct net *net = current->nsproxy->net_ns;
+ struct bond_net *bn =
+ container_of(attr, struct bond_net, class_attr_bonding_masters);
char command[IFNAMSIZ + 1] = {0, };
char *ifname;
int rv, res = count;
@@ -116,7 +116,7 @@ static ssize_t bonding_store_bonds(struct class *cls,
if (command[0] == '+') {
pr_info("%s is being created...\n", ifname);
- rv = bond_create(net, ifname);
+ rv = bond_create(bn->net, ifname);
if (rv) {
if (rv == -EEXIST)
pr_info("%s already exists.\n", ifname);
@@ -128,7 +128,7 @@ static ssize_t bonding_store_bonds(struct class *cls,
struct net_device *bond_dev;
rtnl_lock();
- bond_dev = bond_get_by_name(net, ifname);
+ bond_dev = bond_get_by_name(bn, ifname);
if (bond_dev) {
pr_info("%s is being deleted...\n", ifname);
unregister_netdevice(bond_dev);
@@ -150,9 +150,24 @@ err_no_cmd:
return -EPERM;
}
+static const void *bonding_namespace(struct class *cls,
+ const struct class_attribute *attr)
+{
+ const struct bond_net *bn =
+ container_of(attr, struct bond_net, class_attr_bonding_masters);
+ return bn->net;
+}
+
/* class attribute for bond_masters file. This ends up in /sys/class/net */
-static CLASS_ATTR(bonding_masters, S_IWUSR | S_IRUGO,
- bonding_show_bonds, bonding_store_bonds);
+static const struct class_attribute class_attr_bonding_masters = {
+ .attr = {
+ .name = "bonding_masters",
+ .mode = S_IWUSR | S_IRUGO,
+ },
+ .show = bonding_show_bonds,
+ .store = bonding_store_bonds,
+ .namespace = bonding_namespace,
+};
int bond_create_slave_symlinks(struct net_device *master,
struct net_device *slave)
@@ -1655,11 +1670,13 @@ static struct attribute_group bonding_group = {
* Initialize sysfs. This sets up the bonding_masters file in
* /sys/class/net.
*/
-int bond_create_sysfs(void)
+int bond_create_sysfs(struct bond_net *bn)
{
int ret;
- ret = netdev_class_create_file(&class_attr_bonding_masters);
+ bn->class_attr_bonding_masters = class_attr_bonding_masters;
+
+ ret = netdev_class_create_file(&bn->class_attr_bonding_masters);
/*
* Permit multiple loads of the module by ignoring failures to
* create the bonding_masters sysfs file. Bonding devices
@@ -1673,7 +1690,7 @@ int bond_create_sysfs(void)
*/
if (ret == -EEXIST) {
/* Is someone being kinky and naming a device bonding_master? */
- if (__dev_get_by_name(&init_net,
+ if (__dev_get_by_name(bn->net,
class_attr_bonding_masters.attr.name))
pr_err("network device named %s already exists in sysfs",
class_attr_bonding_masters.attr.name);
@@ -1687,9 +1704,9 @@ int bond_create_sysfs(void)
/*
* Remove /sys/class/net/bonding_masters.
*/
-void bond_destroy_sysfs(void)
+void bond_destroy_sysfs(struct bond_net *bn)
{
- netdev_class_remove_file(&class_attr_bonding_masters);
+ netdev_class_remove_file(&bn->class_attr_bonding_masters);
}
/*
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 43526a2..1007f9a 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -380,11 +380,13 @@ static inline bool bond_is_slave_inactive(struct slave *slave)
return slave->inactive;
}
+struct bond_net;
+
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
int bond_create(struct net *net, const char *name);
-int bond_create_sysfs(void);
-void bond_destroy_sysfs(void);
+int bond_create_sysfs(struct bond_net *net);
+void bond_destroy_sysfs(struct bond_net *net);
void bond_prepare_sysfs_group(struct bonding *bond);
int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
@@ -410,6 +412,7 @@ struct bond_net {
#ifdef CONFIG_PROC_FS
struct proc_dir_entry * proc_dir;
#endif
+ struct class_attribute class_attr_bonding_masters;
};
#ifdef CONFIG_PROC_FS
--
1.7.2.5
--
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