[Qemu-devel] [PATCH v4 0/4] Fix conversion from ISO to VMDK streamOptimized

[Fam Zheng]

Previouly, convert from ISO to VMDK with subformat=streamOptimized fails:

    $ ./qemu-img convert -O vmdk -o subformat=streamOptimized foo.iso bar.vmdk
    VMDK: can't write to allocated cluster for streamOptimized
    qemu-img: error while writing sector 64: Input/output error

Because current code in qemu-img.c uses the normal convert loop, rather than
the compressed == true loop. In VMDK streamOptimized, writes must be in cluster
granularity, because overlapped write to an allocated cluster is -EIO.

This series adds is_compressed into BlockDriverInfo, and uses compressed
convertion loop if the target block driver sets this field to true.

It also implements .bdrv_get_info and .bdrv_write_compressed in VMDK driver to
fit into this framework.

Adds a test case to cover the code path in question: source image cluster size
is smaller.

v4: Rename .is_compressed -> .needs_compressed_writes. (Stefan)
    has -> have in commit log in patch 3.

v3: Finally revisit and address Stefan's review comments on v2 from 2 months
    ago. Sorry for being so slow on this one.
    The general approach is the same, changes include:

    - Split originial "[PATCH v2 5/5] mirror: Check for bdrv_get_info result" 
and
      send to list separately, because it's irrelevant with this series.
    - Don't report cluster_size in bdrv_get_info if it's a flat extent, no need
      to change type of BlockDriverInfo.cluster_size to 64 bits. So drop
      "[PATCH v2 3/5] block: Change BlockDriverInfo.cluster_size to 64 bits".
    - Add qemu-iotests case as [PATCH 4/4].


Fam Zheng (4):
  qemu-img: Convert by cluster size if target is compressed
  vmdk: Implement .bdrv_write_compressed
  vmdk: Implement .bdrv_get_info()
  qemu-iotests: Test converting to streamOptimized from small cluster
    size

 block/vmdk.c               | 35 +++++++++++++++++++++++++++++++++++
 include/block/block.h      |  4 ++++
 qemu-img.c                 |  1 +
 tests/qemu-iotests/059     |  7 +++++++
 tests/qemu-iotests/059.out |  8 ++++++++
 5 files changed, 55 insertions(+)

-- 
1.9.2