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Re: [Qemu-devel] [PATCH] vhdx: Return true for bdrv_has_zero_init
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From: |
Kevin Wolf |
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Subject: |
Re: [Qemu-devel] [PATCH] vhdx: Return true for bdrv_has_zero_init |
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Date: |
Fri, 5 Dec 2014 12:49:22 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 05.12.2014 um 11:26 hat Kevin Wolf geschrieben:
> Like for most other image formats, vhdx images read as all zero in qemu
> after their creation (we're taking advantage from the fact that qemu has
> just created the image, because PAYLOAD_BLOCK_NOT_PRESENT actually means
> undefined rather than zeroed according to the spec).
>
> This fixes that 'qemu-img convert' to vhdx fully populates the image.
>
> Signed-off-by: Kevin Wolf <address@hidden>
Jeff, another thing that Max found while we looked at the spec is that
the 1.0 spec defines PAYLOAD_BLOCK_UNMAPPED as 3, but we define it as 5.
It appears that the 0.95 spec actually had it that way.
Should we handle both 3 and 5 as unmapped?
Kevin