[Qemu-devel] [PATCH v2 0/2] qcow2: Undo leaked allocations in co_writev

[Max Reitz <mreitz@redhat.com>]

If a write request on a qcow2 image spans more than one L2 table,
qcow2_alloc_cluster_offset cannot allocate the required clusters in a
single operation. This results in leaks, if a subsequent (atomic)
allocation in that function fails, because qcow2_co_writev does not undo
unused cluster allocations.

This series implements that deallocation and provides a test for it.

v2:
 - patch 1: added a comment about the significance of future changes at
   a certain point in qcow2_co_writev
 - patch 1: changed QCOW2_DISCARD_ALWAYS to QCOW2_DISCARD_OTHER

Max Reitz (2):
  qcow2: Undo leaked allocations in co_writev
  qemu-iotests: Extend test 026

 block/qcow2.c                      | 15 +++++++++++++++
 tests/qemu-iotests/026             | 31 +++++++++++++++++++++++++++++++
 tests/qemu-iotests/026.out         |  8 ++++++++
 tests/qemu-iotests/026.out.nocache |  8 ++++++++
 4 files changed, 62 insertions(+)

-- 
1.8.3.1