[dm-devel] Question about dmevents

[Jonathan Brassow]

LVM mirroring is indeed one of the targets that makes use of this  
facility.

The device-mapper code base is the place to find the daemon (device- 
mapper/dmeventd).  This daemon resides in userspace waiting for  
events on devices that are being monitored (aka registered).  When an  
event is received from the kernel, it is passed to a registered  
shared library.  LVM2/dmeventd/mirror contains the dynamic shared  
object that handles mirror events.  (The important functions being  
'register', 'unregister', and 'process_event').

  brassow

On Jul 16, 2007, at 10:08 AM, Wood, Brian J wrote:

> Hello everyone, I was wondering if someone could point me to a utility
> that I could look at that uses the dmeventd event registration. I  
> asked
> Heinz M. if there were an LVM utilities that I could see sample  
> code for
> and it sounded like there weren't any implementations currently in LVM
> (he did mention "mirrored.c" but that seems incomplete, unless I'm
> missing something). I'm wondering if someone on this list has made  
> some
> sort of test utility that I could see the source code for (maybe a  
> small
> application and a "hello world" type DSO that I could learn from :) ).
>
> Thank you,
>
> Brian Wood
> Intel Corporation
> Digital Enterprise Group
> Manageability & Platform Software Division
> brian.j.wood at intel.com
>
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