[Qemu-block] [PATCH v3 0/4] Add 'blockdev-snapshot' command

[Alberto Garcia]

Hi,

here's version 3 of the patchset that adds the 'blockdev-snapshot' QMP
command. This one has a couple of important fixes plus some of the
corrections suggested by Eric.

The most controversial change, I believe, is the addition of the
'ignore-backing' field to BlockdevOptionsGenericCOWFormat. This allows
opening an image using 'blockdev-add' but not its backing chain. I
expect that this will generate some debate so decided to go for a
simple solution that would allow me to finish the rest of the series,
but I'm of course open to go for an alternative API/solution.

Regards,

Berto

v3:
- Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat. This
  allows opening images but not their backing images.
- Check for op blockers in the snapshot node and make sure that it
  doesn't have any backing image.
- Remove extra check for the existence of the snapshot node:
  bdrv_open() already does that.
- Extend iotest 085 to add tests for 'blockdev-snapshot'.
- Replace local_err with errp in some places where the former is
  unnecessary.
- Update command description.
- Add 'since' tag to the 'blockdev-snapshot' field in TransactionAction.

v2: https://lists.gnu.org/archive/html/qemu-block/2015-09/msg00094.html
- Add 'blockdev-snapshot' command instead of allowing passing options
  to 'blockdev-snapshot-sync'.
- Rename BlockdevSnapshot to BlockdevSnapshotSync

v1: https://lists.gnu.org/archive/html/qemu-block/2015-08/msg00236.html

Alberto Garcia (4):
  block: rename BlockdevSnapshot to BlockdevSnapshotSync
  block: Add 'ignore-backing' field to BlockdevOptionsGenericCOWFormat
  block: add a 'blockdev-snapshot' QMP command
  block: add tests for the 'blockdev-snapshot' command

 block.c                    |   5 ++
 blockdev.c                 | 165 ++++++++++++++++++++++++++++-----------------
 qapi-schema.json           |   4 +-
 qapi/block-core.json       |  38 +++++++++--
 qmp-commands.hx            |  29 ++++++++
 tests/qemu-iotests/085     |  97 ++++++++++++++++++++++++--
 tests/qemu-iotests/085.out |  34 +++++++++-
 7 files changed, 298 insertions(+), 74 deletions(-)

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2.5.1