Porting the block-iscsi hotplug script

[Gustau Pérez]

> Hello,
>
> I've been on vacations last week and I'm trying to catch up with my email 
> backlog, sorry for the delay in the reply.
>
> OTOH, George Dunlap from Citrix has posted the series that should enable 
> hotplug scripts to work with HVM domains. I need to rebase my FreeBSD 
> hotplug script support on top of it, so you can try it. George's series 
> can be found at:
>
> http://lists.xenproject.org/archives/html/xen-devel/2016-03/msg02739.html
>
> I will try to rebase my work on top of this and provide you with a git 
> branch so you can easily test it.
>
> Regarding your questions about the locking mechanism, I'm not that 
> familiar with it, but I'm not sure why a lock array is need. AFAICT only 
> one lock should be needed, that prevents multiple hotplug scripts from 
> travessing the xenstore disk information at the same time. Please bring 
> this question to xen-devel.
>
>> [1] http://pastebin.com/FhaQeuG1
>> [2] http://pastebin.com/ZHWKRg5f
> LGTM :). You will have to formally submit this as patches when the hotplug 
> work is committed to upstream Xen.
>

   Hi Roger,

   I've been checking the changes to eventually send them upstream and
there are a bits that I thinkg you would also need to commit upstream
before I can send mine. Those changes are in the sysutils/xen-tools port
(I see those signed patches in the files/ directory but I can't find
them in xenbits repo).

   I did the signed patch containing my changes [1], if you want to
check it. I could add your changes, but I fear I may miss something
along the way.

   Best,

   Gustau

[1] http://dpaste.com/2FGK8XN