[Drbd-dev] [DRBD-8.0 PATCH] Add split-brain event to netlink

[Montrose, Ernest]

Simon,
This one actually was.  And Phil took a different approach where we
would use the usermode_helper. Below is that exchange for completeness:
 
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
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From: drbd-dev-bounces at linbit.com [mailto:drbd-dev-bounces at linbit.com]
On Behalf Of Graham, Simon
Sent: Friday, January 11, 2008 10:25 AM
To: drbd-dev at linbit.com
Subject: [Drbd-dev] [DRBD-8.0 PATCH] Add split-brain event to netlink
 
I'm not sure if this was previously submitted or not, but this change
adds an explicit split-brain event to the netlink notifications so that
user mode code can know when a split-brain situation is encountered.
 
Simon
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