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![Stefan Hajnoczi](/assets/img/avatar_default.png)
Zero writes are a dedicated interface for writing regions of zeroes into the image file. If clusters are not yet allocated it is possible to use an efficient metadata representation which keeps the image file compact and does not store individual zero bytes. Implementing this for the QED image format is fairly straightforward. The only issue is that when a zero write touches an existing cluster we have to allocate a bounce buffer and perform a regular write. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu.org - QEMU team
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