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Driver core: notify userspace of network device renames

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Provide rename event for when we rename network devices.

Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jean Tourrilhes 2007-03-07 10:49:30 -08:00 committed by Greg Kroah-Hartman
parent 1b0b3b9980
commit ca2f37dbc5
2 changed files with 41 additions and 0 deletions
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30
lib/kobject.c
View file

@ -311,13 +311,43 @@ EXPORT_SYMBOL(kobject_set_name);
int kobject_rename(struct kobject * kobj, const char *new_name)
{
int error = 0;
const char *devpath = NULL;
char *devpath_string = NULL;
char *envp[2];
kobj = kobject_get(kobj);
if (!kobj)
return -EINVAL;
if (!kobj->parent)
return -EINVAL;
devpath = kobject_get_path(kobj, GFP_KERNEL);
if (!devpath) {
error = -ENOMEM;
goto out;
}
devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
if (!devpath_string) {
error = -ENOMEM;
goto out;
}
sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
envp[0] = devpath_string;
envp[1] = NULL;
/* Note : if we want to send the new name alone, not the full path,
* we could probably use kobject_name(kobj); */
error = sysfs_rename_dir(kobj, kobj->parent->dentry, new_name);
/* This function is mostly/only used for network interface.
* Some hotplug package track interfaces by their name and
* therefore want to know when the name is changed by the user. */
if (!error)
kobject_uevent_env(kobj, KOBJ_MOVE, envp);
out:
kfree(devpath_string);
kfree(devpath);
kobject_put(kobj);
return error;

11
net/core/net-sysfs.c
View file

@ -421,6 +421,17 @@ static int netdev_uevent(struct device *d, char **envp,
buf += n;
size -= n;
if ((size <= 0) || (i >= num_envp))
return -ENOMEM;
/* pass ifindex to uevent.
* ifindex is useful as it won't change (interface name may change)
* and is what RtNetlink uses natively. */
envp[i++] = buf;
n = snprintf(buf, size, "IFINDEX=%d", dev->ifindex) + 1;
buf += n;
size -= n;
if ((size <= 0) || (i >= num_envp))
return -ENOMEM;