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Re: qemu-img - vhdx compatibility with Hyper-V
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From: |
Max Reitz |
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Subject: |
Re: qemu-img - vhdx compatibility with Hyper-V |
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Date: |
Mon, 28 Oct 2019 11:01:41 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 27.10.19 10:46, Adam Baxter wrote:
> I've had another look at this and managed to get gdb working enough to
> step through the source code.
>
> It looks like raw_co_create(BlockdevCreateOptions *options, Error
> **errp) in block\file-win32.c *always* calls set_sparse (which calls
> Win32's underlying DeviceIoControl/FSCTL_SET_SPARSE). file-posix.c has
> some options for "preallocation" and only creates sparse files when
> asked, but these aren't supported for a Windows host in the code right now.
>
> I'm not quite at the point where I could create a patch, but with some
> help I could get it done.
Shouldn’t specifying -S 0 for qemu-img convert solve the problem?
Max
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