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Re: [Qemu-devel] [PATCH] qcow2: Metadata preallocation
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From: |
Jamie Lokier |
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Subject: |
Re: [Qemu-devel] [PATCH] qcow2: Metadata preallocation |
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Date: |
Sun, 16 Aug 2009 17:48:42 +0100 |
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User-agent: |
Mutt/1.5.13 (2006-08-11) |
Filip Navara wrote:
> FILE_ATTRIBUTE_SPARSE_FILE? You can't actually set it when
> opening/creating the file, a separate call to
> DeviceIoControl/FSCTL_SET_SPARSE is needed.
I see that you increase the file size by writing zeros to the end.
Can't you use the Windows equivalent of unix ftruncate() to extend the
file instead, after FSCTL_SET_SPARSE?
-- Jamie