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@xxxxxxxxx
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