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Merge branch 'netdev_sysfs_symlink_rename'

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Veaceslav Falico says:

====================
net: rename device's sysfs symlinks on name change

First patch only adds helper functions and cleans up the code a bit, second
one already does the renaming.

v1->v2:
Don't export the function, as it's used only in dev.c.
====================

Reported-by: Ding Tianhong <dingtianhong@huawei.com>
CC: Ding Tianhong <dingtianhong@huawei.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Nicolas Dichtel <nicolas.dichtel@6wind.com>
CC: Cong Wang <amwang@redhat.com>
CC: netdev@vger.kernel.org
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2014-01-15 15:17:03 -08:00
parent b93819854d 5bb025fae5
commit 89fc8632dd
2 changed files with 53 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/linux/netdevice.h
View file

@ -2941,6 +2941,7 @@ int netdev_master_upper_dev_link_private(struct net_device *dev,
void *private);
void netdev_upper_dev_unlink(struct net_device *dev,
struct net_device *upper_dev);
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname);
void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev);
int skb_checksum_help(struct sk_buff *skb);

79
net/core/dev.c
View file

@ -1119,6 +1119,8 @@ int dev_change_name(struct net_device *dev, const char *newname)
write_seqcount_end(&devnet_rename_seq);
netdev_adjacent_rename_links(dev, oldname);
write_lock_bh(&dev_base_lock);
hlist_del_rcu(&dev->name_hlist);
write_unlock_bh(&dev_base_lock);
@ -1138,6 +1140,7 @@ int dev_change_name(struct net_device *dev, const char *newname)
err = ret;
write_seqcount_begin(&devnet_rename_seq);
memcpy(dev->name, oldname, IFNAMSIZ);
memcpy(oldname, newname, IFNAMSIZ);
goto rollback;
} else {
pr_err("%s: name change rollback failed: %d\n",
@ -4623,13 +4626,36 @@ struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
}
EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
int netdev_adjacent_sysfs_add(struct net_device *dev,
struct net_device *adj_dev,
struct list_head *dev_list)
{
char linkname[IFNAMSIZ+7];
sprintf(linkname, dev_list == &dev->adj_list.upper ?
"upper_%s" : "lower_%s", adj_dev->name);
return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
linkname);
}
void netdev_adjacent_sysfs_del(struct net_device *dev,
char *name,
struct list_head *dev_list)
{
char linkname[IFNAMSIZ+7];
sprintf(linkname, dev_list == &dev->adj_list.upper ?
"upper_%s" : "lower_%s", name);
sysfs_remove_link(&(dev->dev.kobj), linkname);
}
#define netdev_adjacent_is_neigh_list(dev, dev_list) \
(dev_list == &dev->adj_list.upper || \
dev_list == &dev->adj_list.lower)
static int __netdev_adjacent_dev_insert(struct net_device *dev,
struct net_device *adj_dev,
struct list_head *dev_list,
void *private, bool master)
{
struct netdev_adjacent *adj;
char linkname[IFNAMSIZ+7];
int ret;
adj = __netdev_find_adj(dev, adj_dev, dev_list);
@ -4652,16 +4678,8 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
pr_debug("dev_hold for %s, because of link added from %s to %s\n",
adj_dev->name, dev->name, adj_dev->name);
if (dev_list == &dev->adj_list.lower) {
sprintf(linkname, "lower_%s", adj_dev->name);
ret = sysfs_create_link(&(dev->dev.kobj),
&(adj_dev->dev.kobj), linkname);
if (ret)
goto free_adj;
} else if (dev_list == &dev->adj_list.upper) {
sprintf(linkname, "upper_%s", adj_dev->name);
ret = sysfs_create_link(&(dev->dev.kobj),
&(adj_dev->dev.kobj), linkname);
if (netdev_adjacent_is_neigh_list(dev, dev_list)) {
ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
if (ret)
goto free_adj;
}
@ -4681,14 +4699,8 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
return 0;
remove_symlinks:
if (dev_list == &dev->adj_list.lower) {
sprintf(linkname, "lower_%s", adj_dev->name);
sysfs_remove_link(&(dev->dev.kobj), linkname);
} else if (dev_list == &dev->adj_list.upper) {
sprintf(linkname, "upper_%s", adj_dev->name);
sysfs_remove_link(&(dev->dev.kobj), linkname);
}
if (netdev_adjacent_is_neigh_list(dev, dev_list))
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
free_adj:
kfree(adj);
dev_put(adj_dev);
@ -4701,7 +4713,6 @@ static void __netdev_adjacent_dev_remove(struct net_device *dev,
struct list_head *dev_list)
{
struct netdev_adjacent *adj;
char linkname[IFNAMSIZ+7];
adj = __netdev_find_adj(dev, adj_dev, dev_list);
@ -4721,13 +4732,8 @@ static void __netdev_adjacent_dev_remove(struct net_device *dev,
if (adj->master)
sysfs_remove_link(&(dev->dev.kobj), "master");
if (dev_list == &dev->adj_list.lower) {
sprintf(linkname, "lower_%s", adj_dev->name);
sysfs_remove_link(&(dev->dev.kobj), linkname);
} else if (dev_list == &dev->adj_list.upper) {
sprintf(linkname, "upper_%s", adj_dev->name);
sysfs_remove_link(&(dev->dev.kobj), linkname);
}
if (netdev_adjacent_is_neigh_list(dev, dev_list))
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
list_del_rcu(&adj->list);
pr_debug("dev_put for %s, because link removed from %s to %s\n",
@ -4996,6 +5002,25 @@ void netdev_upper_dev_unlink(struct net_device *dev,
}
EXPORT_SYMBOL(netdev_upper_dev_unlink);
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
{
struct netdev_adjacent *iter;
list_for_each_entry(iter, &dev->adj_list.upper, list) {
netdev_adjacent_sysfs_del(iter->dev, oldname,
&iter->dev->adj_list.lower);
netdev_adjacent_sysfs_add(iter->dev, dev,
&iter->dev->adj_list.lower);
}
list_for_each_entry(iter, &dev->adj_list.lower, list) {
netdev_adjacent_sysfs_del(iter->dev, oldname,
&iter->dev->adj_list.upper);
netdev_adjacent_sysfs_add(iter->dev, dev,
&iter->dev->adj_list.upper);
}
}
void *netdev_lower_dev_get_private(struct net_device *dev,
struct net_device *lower_dev)
{