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Re: [Qemu-devel] [Nbd] [PATCHv2] Improve documentation of FUA and FLUSH

From: Alex Bligh
Subject: Re: [Qemu-devel] [Nbd] [PATCHv2] Improve documentation of FUA and FLUSH
Date: Sat, 2 Apr 2016 14:22:10 +0100


On 2 Apr 2016, at 13:57, Wouter Verhelst <address@hidden> wrote:

> On Fri, Apr 01, 2016 at 10:54:42AM +0100, Alex Bligh wrote:
>> Improve the documentation of NBD_CMD_FLUSH and NBD_CMD_FLAG_FUA. Specifically
>> the latter may be set on any command, and its semantics on commands other
>> than NBD_CMD_WRITE need explaining. Further, explain how these relate to
>> reordering of commands.
> This seems still a WIP.
> I'm not sure what the best way forward with this thing is...

I rebased it on master.

The outstanding issue is how we treat FUA on non-writing commands.
I sent a message to lkml to determine how it treats it. I have my
views (as per the message) but I thought I'd wait until lkml
had its say as that was the interface we were originally trying
to emulate. I think we are going to end up with it means
nothing, server SHOULD NOT sent and client MUST ignore.

Alex Bligh

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