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Revision ea80b906

IDea80b906f445969a5ccc781beb4e8bb7f60bbdbb

Added by Kevin Wolf over 14 years ago

qcow2: Fix metadata preallocation

The wrong version of the preallocation patch has been applied, so this is the
remaining diff.

We can't use truncate to grow the image file to the right size because we don't
know if metadata has been written after the last data cluster. In this case
truncate would shrink the file and destroy its metadata. Write a zero sector at
the end of the virtual disk instead to ensure that the file is big enough.

Signed-off-by: Kevin Wolf <>
Signed-off-by: Anthony Liguori <>

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