| Re: [PATCH 1/2] SYSCTL: root unregister routine introduced [message #44530 is a reply to message #44526] |
Tue, 13 December 2011 09:02   |
Stanislav Kinsbursky
Messages: 683
Registered: October 2011
|
Senior Member |
|
|
13.12.2011 02:52, Andrew Morton пишет:
> On Mon, 12 Dec 2011 21:50:00 +0300
> Stanislav Kinsbursky<skinsbursky@parallels.com> wrote:
>
>> This routine is required for SUNRPC sysctl's, which are going to be allocated,
>> processed and destroyed per network namespace context.
>> IOW, new sysctl root will be registered on network namespace creation and
>> thus have to unregistered before network namespace destruction.
>>
>
> It's a bit suspicious that such a mature subsystem as sysctl newly
> needs its internals exported like this. Either a) the net namespaces
> work is doing something which hasn't been done before or b) it is doing
> something wrong.
>
> So, please explain further so we can confirm that it is a) and not b).
>
Hello, Andrew.
The goal is to provide an ability to control and modify data by sysctl's in
network namespace context. This is done by "net" sysctl's.
But there are two more issues to solve:
1) Sysctl's have to be in /proc/sys/sunrpc
2) Sysctl's content should be accessible from creator's network context (not
current user ones's).
>> --- a/kernel/sysctl.c
>> +++ b/kernel/sysctl.c
>> @@ -1701,6 +1701,13 @@ void register_sysctl_root(struct ctl_table_root *root)
>> spin_unlock(&sysctl_lock);
>> }
>>
>> +void unregister_sysctl_root(struct ctl_table_root *root)
>> +{
>> + spin_lock(&sysctl_lock);
>> + list_del(&root->root_list);
>> + spin_unlock(&sysctl_lock);
>> +}
>> +
>
> This requires the addition of a declaration to include/linux/sysctl.h.
>
> Once that is done and review is complete, I'd suggest that these two
> patches be joined into a single patch, and that patch become part of
> whatever patch series it is which needs them.
>
Ok, I'll do so.
--
Best regards,
Stanislav Kinsbursky
|
|
|
|
OpenVZ Forum
Members
Search
Help
Register
Login
Home
