[Linux-cluster] [RFC] Read access to /config/dlm/<cluster>/comms/<comm>/addr

[Masatake YAMATO]

> On Thu, Jun 09, 2011 at 05:55:29PM +0900, Masatake YAMATO wrote:
>> Hi,
>> 
>> I've found /config/dlm/<cluster>/comms/<comm>/addr is readable 
>> (in meaning of ls -l) but no handler(comm_addr_read) is defined in 
>> dlm/fs/dlm/config.c.
>> 
>> If cat command works fine with /config/dlm/<cluster>/comms/<comm>/addr,
>> it will be nice to understand the status of dlm. So I'm thinking about
>> writing a patch.
>> 
>> But after reading the source code, I've found its difficulties;
>> /config/dlm/<cluster>/comms/<comm>/addr holds 'struct
>> sockaddr_storage'.
> 
> Another problem is that you can write multiple addr's to that file
> sequentially when using SCTP, so which do you get when you read it?
> 
>>     3. Make /config/dlm/<cluster>/comms/<comm>/addr unreadable (in meaning of ls -l)
>> 
>>        e.g.
>>        # ls -l /config/dlm/<cluster>/comms/<comm>/addr
>>        --w-------. 1 root root 4096 Jun  9 08:51 /config/dlm/<cluster>/comms/<comm>/addr
>> 
>>        Advantage: easy to implement.
>>        Disadvantage: no way to know the value of node addr of dlm view.
> 
> I suggest this.  If you want a way to read them, I'd add a new readonly
> file addr_list,

Of course, I want:)
 
> # cat /config/dlm/<cluster>/comms/<comm>/addr_list
> AF_INET 192.168.151.1
> AF_INET 192.168.151.2

This is what I want.
 
> Dave
>