[Drbd-dev] drbdsetup events patch to announce Split-brain

[Philipp Reisner]

On Thursday 25 October 2007 14:24:55 Montrose, Ernest wrote:
> Phil,
> Currently we do not use the payload for anything.  I was just being
> paranoid thinking that we might need it in the future.  But you can drop
> it if you wish.  If we have a pressing need for it in the future, we'll
> deal with it then.
>

Ernest,

Over the weekend I realized that the split brain event is quite
similar to a number of events we already signal back to userspace.

The invocation of handlers is also visible through the "drbdsetup events"
interface.

The attached patch creates an handler called "split-brain". If you
can live with that interface as well, I will commit that...

In the future I want to go this way:

  * Allow one to set the usermode_helper to the empty string. Then it 
    is still possible to get all events through the "drbdsetup events"
    interface.
  * The "outdate-peer" usermode_helper sends an exit code back
    to kernel space. This is not yet possible when one only uses
    the "drbdsetup events" interface. This should get fixed.

-Phil
-- 
: Dipl-Ing Philipp Reisner                      Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH          Fax +43-1-8178292-82 :
: Vivenotgasse 48, 1120 Vienna, Austria        http://www.linbit.com :
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sb_as_handler.diff
Type: text/x-diff
Size: 3402 bytes
Desc: not available
Url : http://lists.linbit.com/pipermail/drbd-dev/attachments/20071029/961989ca/sb_as_handler.bin