[Qemu-devel] [PATCH 0/4] qemu-img: support compression regardless of cluster size

[Stefan Hajnoczi <stefanha@redhat.com>]

It was hard to find a short email subject line.  Anyway, the problem is that
qemu-img convert -c fails with the following error message if the input image
length is not a multiple of the output cluster size:

  qemu-img: error while compressing sector 0: Input/output error

Ilkka Tengvall <ilkka.tengvall@cybercom.com> reported the failure.  kwolf and
eblake suggested a fix which this patch series implements.

qemu-img convert -c succeeds with these patches applied.

The final patch adds qemu-iotests case 053 to protect against regressions.

Stefan Hajnoczi (4):
  qcow2: allow sub-cluster compressed write to last cluster
  qcow: allow sub-cluster compressed write to last cluster
  qemu-img: do not zero-pad the compressed write buffer
  qemu-iotests: add 053 unaligned compressed image size test

 block/qcow.c               | 17 +++++++++++--
 block/qcow2.c              | 17 +++++++++++--
 qemu-img.c                 |  8 ++----
 tests/qemu-iotests/053     | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/053.out | 10 ++++++++
 tests/qemu-iotests/group   |  1 +
 6 files changed, 106 insertions(+), 10 deletions(-)
 create mode 100755 tests/qemu-iotests/053
 create mode 100644 tests/qemu-iotests/053.out

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1.8.1.4