[Qemu-block] [PATCH v2 0/2] Active commit regression fix

[Jeff Cody]

Changes from v1:

* Rather than allow insertion when bs->device_listtqe_prev points to
  a NULL entry, make sure than we follow the block scheme of enforcing
  bs->device_list->tqe_prev is NULL upon deletion. (Thanks Max!)

Bug #1300209 is a regression in 2.5, introduced during the 
change away from bdrv_swap().

When we change the parent backing link (change_parent_backing_link),
we must also accomodate non-NULL tqe_prev pointers that point to a
NULL entry.  Please see patch #1 for more details.

Jeff Cody (2):
  block: set device_list.tqe_prev to NULL on BDS removal
  block: qemu-iotests - add test for snapshot, commit, snapshot bug

 block.c                    |  24 ++++++----
 blockdev.c                 |   3 +-
 include/block/block.h      |   1 +
 tests/qemu-iotests/143     | 114 +++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/143.out |  24 ++++++++++
 tests/qemu-iotests/group   |   1 +
 6 files changed, 155 insertions(+), 12 deletions(-)
 create mode 100755 tests/qemu-iotests/143
 create mode 100644 tests/qemu-iotests/143.out

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1.9.3