[Qemu-stable] [PATCH 0/2] Fix the reopening of images in 'block-commit'

[Alberto Garcia]

This series fixes a bug in the 'block-commit' operation under the
following scenario:

   [A] <- [B] <- [C] <- [D]

If we do block-commit top=B base=A, the contents of [B] will be
written into [A] resulting in this chain:

   [A] <- [C] <- [D]

In order to perform this operation, [A] must be reopened in read-write
mode but so does [C] because its backing file string needs to be
updated to point at [A].

There's a bug in the current code that makes [A] read-only again when
[C] is reopened. This series includes a fix for that bug plus a test
case for the scenario.

This affects both master and the 2.4 branch.

Berto

Alberto Garcia (2):
  commit: reopen overlay_bs before base
  qemu-iotests: Test the reopening of overlay_bs in 'block-commit'

 block/commit.c             |  8 ++++----
 tests/qemu-iotests/040     | 30 ++++++++++++++++++++++++++++++
 tests/qemu-iotests/040.out |  4 ++--
 3 files changed, 36 insertions(+), 6 deletions(-)

-- 
2.6.1