Hi all!

Here are two new options for copy-before-write filter:

on-cbw-error allows to alter the behavior on copy-before-write operation
failure: not break guest write but break the snapshot (and therefore
backup process)

cbw-timeout allows to limit cbw operation by some timeout.

So, for example, using cbw-timeout=60 and on-cbw-error=break-snapshot
you can be sure that guest write will not stuck for more than 60
seconds and will never fail due to backup problems.

This series unites and fixes my
"[PATCH 0/3] block: copy-before-write: on-cbw-error behavior" and
"[PATCH 0/4] block: copy-before-write: cbw-timeout"

Supersedes: <20220301205929.2006041-1-vsementsov@openvz.org>
Supersedes: <20220302162442.2052461-1-vsementsov@openvz.org>

Vladimir Sementsov-Ogievskiy (7):
  block/copy-before-write: refactor option parsing
  block/copy-before-write: add on-cbw-error open parameter
  iotests: add copy-before-write: on-cbw-error tests
  util: add qemu-co-timeout
  block/block-copy: block_copy(): add timeout_ns parameter
  block/copy-before-write: implement cbw-timeout option
  iotests: copy-before-write: add cases for cbw-timeout option

 block/block-copy.c                            |  26 ++-
 block/copy-before-write.c                     | 136 +++++++++---
 include/block/block-copy.h                    |   2 +-
 include/qemu/coroutine.h                      |  13 ++
 qapi/block-core.json                          |  30 ++-
 tests/qemu-iotests/tests/copy-before-write    | 206 ++++++++++++++++++
 .../qemu-iotests/tests/copy-before-write.out  |   5 +
 util/meson.build                              |   1 +
 util/qemu-co-timeout.c                        |  89 ++++++++
 9 files changed, 464 insertions(+), 44 deletions(-)
 create mode 100755 tests/qemu-iotests/tests/copy-before-write
 create mode 100644 tests/qemu-iotests/tests/copy-before-write.out
 create mode 100644 util/qemu-co-timeout.c

-- 
2.35.1