Patch: Implement FSCTL_LMR_REQUEST_RESILIENCY

[Stefan (metze) Metzmacher]

Am 09.10.2014 um 23:58 schrieb Michael Adam:
> On 2014-10-09 at 14:45 -0700, Richard Sharpe wrote:
>> On Wed, Oct 8, 2014 at 7:29 AM, Richard Sharpe
>> <realrichardsharpe at gmail.com> wrote:
>>> Hi folks,
>>>
>>> There are indications that HyperV requires the server to implement
>>> FSCTL_LMR_REQUEST_RESILIENCY, so I have a proposed implementation of
>>> it.
>>>
>>> Attached is a patch for both FSCTL_LMR_REQUEST_RESILIENCY and a small
>>> torture test for it (doesn't do much as yet.)
>>>
>>> Eventually, we will also have to deal with the GUID-tagged blob that
>>> is an Extra Info (Extra Create Parameter) that was in the CREATE
>>> request that precedes the FSCTL as well, I imagine.
>>
>> While we are arguing about all the abstruse technical details, the
>> people I did this work for have reported that this change, along with
>> one other thing, seems to be enough to have HyperV create a Virtual
>> Disk on a Samba server, start the VM and install Windows.
>>
>> I hope to be able to write up the steps involved soon.
> 
> That is great to hear!
> 
> But these details are not so abstruse at all I'd say,
> but essential to our implementation of these features.
> After all, if we offer the possiblity to run vm images
> off a samba server, we have to make it vaguely safe I think.

We already have a "fake oplocks" option, we could also have a "fake
resilient handles" option...

metze

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