Re: [osd-dev] nfs-utils: userspace support for autologin feature in object layout driver

[Benny Halevy <bhalevy@tonian.com>]

On 2012-02-10 01:02, Bhamare, Sachin wrote:
> Hi, 
>    I have been working on implementing autologin support for objectlayout
> driver in pNFS client. This feature would allow pNFS object clients to
> receive an URI (e.g. iscsi://<IP>:<PORT>) of a target OSD via
> GETDEVICEINFO rpc from the server. Object layout driver would then pass
> this information to an user space daemon which would perform the login
> task 
> depending on the protocol involved (e.g. Iscsi login using iscsiadm).
> 
> For userspace daemon, we have 2 implementation choices.
> 
> 1. Add new daemon (say, osdlogind) to nfs-utils which would process the
> upcalls from object layout driver via rpc_pipefs (very similar to the way
> blkmapd works)
> 2. Modify blkmapd in nfs-utils package to be able to process upcalls from
> the object layout driver and add new functionality to process these
> messages.
> 
> I think, (1) above is the simplest and cleanest way to go about
> implementing this. (2) adds an indirect dependency between block layout
> driver and object layout driver if they were to share the same rpc pipe to
> communicate with user space.

I'm inclined to agree but I'll defer this to Steve as the maintainer of nfs utils

Benny

> 
> Currently I have a simple implementation of 'osdlogind' coded up which
> borrows its design heavily from 'blkmapd' code. Please let me know what
> would be the preferred way to go about this. Thanks in advance for your
> inputs. 
> 
> Sachin Bhamare 
> Panasas Inc.
> 
> 
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