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Re: [Qemu-devel] [PATCH 1/1] nbd: increase maximum size of the PWRITE_ZE
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From: |
Alex Bligh |
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Subject: |
Re: [Qemu-devel] [PATCH 1/1] nbd: increase maximum size of the PWRITE_ZERO request |
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Date: |
Sat, 10 Feb 2018 18:45:55 +0100 |
> On 10 Feb 2018, at 18:43, Alex Bligh <address@hidden> wrote:
>
> So I think a reasonable logic for Qemu would be to try NBD_CMD_INFO and find
> the maximum write size, and if that's unsupported use 0xffffffff (capping at
> export size, or export size minus write offset).
Ur actually capping it at (2^16 - blocksize) would be the right thing to do
(writes should be multiples of the block size).
--
Alex Bligh