commit 8268b7675c15b71023ad4ba5930c5f77d3e98271
author Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Fri Oct 15 07:56:35 2010 -0700
committer Kevin Wolf <kwolf@redhat.com> Wed Feb 22 16:17:03 2012 +0100
tree 443e9ebf020b2bf802613cb59e3ff6cc6005c18b
parent 89d22bc30629f6b89ed7fcbe4c7c6a6d1a9fd626

qemu-iotests: add read/write from smaller backing image test

Some image formats support backing images that are smaller than the
image file.  This patch adds a test that verifies that reads and writes
beyond the end of backing image work.

Unallocated reads beyond the end of the backing file should produce
zeroes.

Writes beyond the end of the backing file should copy-on-write using
zeroes.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>