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Re: [Qemu-devel] [PATCH v2] doc: Add NBD_CMD_BLOCK_STATUS extension

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2] doc: Add NBD_CMD_BLOCK_STATUS extension
Date: Tue, 5 Apr 2016 15:43:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 05/04/2016 06:05, Kevin Wolf wrote:
> The options I can think of is adding a request field "max number of
> descriptors" or a flag "only single descriptor" (with the assumption
> that clients always want one or unlimited), but maybe you have a better
> idea.

I think a limit is better.  Even if the client is ultimately going to
process the whole file, it may take a very long time and space to
retrieve all the descriptors in one go.  Rather than query e.g. 16GB at
a time, I think it's simpler to put a limit of 1024 descriptors or so.


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