Re: [Linux-cluster] [RFC][PATCH] Add ability to freeze e service.

[Lon Hohberger <lhh redhat com>]

On Mon, Apr 23, 2007 at 11:15:22AM +0200, Simone Gotti wrote:
> Hi,
> 
> like discussed with lon on IRC I'm trying to add to rgmanager the
> ability to freeze a service. I worked on it in these days and did an
> example patch. Here is how I think what a "freeze" can be and, of
> course, it can be implemented in many other ways so it's only an
> example.

Hi,

couple of comments -

(1) s/freezed/frozen/ig  :)

(2) svc_status_inquiry shouldn't call rg_lock(); you should use
get_rg_state_local() instead of rg_lock/get_rg_state/rg_unlock

Note that svc_status_inquiry isn't even used yet, so the behavior
might change at a later date ;)

(3.a) Warning: The addition of rs_flags to rg_state_t will break
compatibility with existing software (which is fine in -HEAD).  It
would be easier to cope with this change (that is- make upgrades from
old->new work) if you added the rs_flags field after the
rs_transition field. 

(3.b) If you don't want to do that, then you need to add another 32-bits
worth of data (could be just a "pad" field) before rs_transition because
the kernel on ia64 machines will complain if they read a 64-bit int and
it's not aligned on a 64-bit boundary.

Aside from that, it looks like you got it right for what you wanted it
to do.  I can fix (1) (language stuff) if you fix (2) and (3).

-- Lon

-- 
Lon Hohberger - Software Engineer - Red Hat, Inc.