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由 Stefan Hajnoczi 提交于
Image formats that grow the image file on demand and are organized into clusters must handle sub-cluster allocating writes. Such writes touch a portion of a previously unallocated data cluster. After the image file is grown with the written data, reads of that cluster should work as expected: 1. Sectors before the written region are zero. 2. The written region is present and the data is uncorrupted. 3. Sectors after the written region are zero. Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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