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Revision 89d22bc3

ID89d22bc30629f6b89ed7fcbe4c7c6a6d1a9fd626

Added by Stefan Hajnoczi about 12 years ago

qemu-iotests: add sub-cluster allocating write test for sparse image formats

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: Stefan Hajnoczi <>
Signed-off-by: Christoph Hellwig <>

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