[Qemu-devel] [PATCH 0/3] vpc: support probing of fixed size images

[Levente Kurusa <lkurusa@redhat.com>]

Fixed size VPC images do not have a footer, hence the current probe
function will fail and QEMU will fall back to the raw_bsd driver, which is
not the correct behaviour. The specification of the format says that fixed
size images have a footer as the last 512 bytes of the file. The footer is
exactly the same as the header would be in the case of dynamically growing
images.

For this, we need to read the last 512 bytes of the image, however the
current mechanics predominantly read the first 2048 bytes and pass that
as a buffer to the probe functions. Solve this by passing the
BlockDriverState to the probe functions, hence giving them a chance to read
the extra bytes they might need.

Levente Kurusa (3):
  block: format: pass down the current state to the format's probe
    function
  block: vpc: introduce vpc_check_signature function
  block: vpc: handle fixed size images in probe function

 block.c                   |  2 +-
 block/bochs.c             |  3 ++-
 block/cloop.c             |  3 ++-
 block/cow.c               |  3 ++-
 block/dmg.c               |  3 ++-
 block/parallels.c         |  3 ++-
 block/qcow.c              |  3 ++-
 block/qcow2.c             |  3 ++-
 block/qed.c               |  4 ++--
 block/raw_bsd.c           |  3 ++-
 block/vdi.c               |  3 ++-
 block/vmdk.c              |  3 ++-
 block/vpc.c               | 34 +++++++++++++++++++++++++++++-----
 include/block/block_int.h |  3 ++-
 14 files changed, 54 insertions(+), 19 deletions(-)

-- 
1.9.3