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

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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 <stefanha@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Stefan Hajnoczi 2010-10-15 07:55:52 -07:00 • committed by Kevin Wolf
parent 2547caa169
commit 89d22bc306
3 changed files with 101 additions and 0 deletions
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23
tests/qemu-iotests/027.out Normal file
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QA output created by 027
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
== writing first cluster to populate metadata ==
wrote 65536/65536 bytes at offset 65536
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== writing at sub-cluster granularity ==
wrote 2048/2048 bytes at offset 1024
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== verify pattern ==
read 2048/2048 bytes at offset 1024
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== verify zeroes before sub-cluster pattern ==
read 2048/2048 bytes at offset 0
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
== verify zeroes after sub-cluster pattern ==
read 2560/2560 bytes at offset 1024
2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done