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Re: [Qemu-devel] [Nbd] [PATCH] nbd: fix trim/discard commands with a len

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [Nbd] [PATCH] nbd: fix trim/discard commands with a length bigger than NBD_MAX_BUFFER_SIZE
Date: Wed, 11 May 2016 17:08:32 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1

On 11/05/2016 16:55, Alex Bligh wrote:
>> > Then I think I will propose a doc patch to the extension-info branch
>> > that adds new INFO items for NBD_INFO_TRIM_SIZE and
>> > NBD_INFO_WRITE_ZERO_SIZE (if requested by client and replied by server,
>> > then this can be larger than the normal maximum size in
>> > NBD_INFO_BLOCK_SIZE; if either side doesn't request the info, then
>> > assume any maximum in NBD_INFO_BLOCK_SIZE applies, otherwise UINT32_MAX;
>> > and the two infos are separate items because NBD_FLAG_SEND_TRIM and
>> > NBD_FLAG_SEND_WRITE_ZEROES are orthogonally optional).
> mmmm ...
> at this rate you'd be better with a list of command / maximum size
> tuples!

Not sure if serious or not, but anyway I think enumerating the items
individually should be enough.  It's not like commands grow on trees. :)


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