On 06/29/2018 11:15 AM, Vladimir Sementsov-Ogievskiy wrote:
> Image fleecing, or external (or pull) backup scheme is near to complete.
> Here is forgotten test, written by Fam in far 2014, with two my necessary
> patches, previously sent separately, so the series are called "v2"
>
> v2:
> 01: add transaction support
> 02: rebase on master, drop "'fleecing-filter': 'BlockdevCreateNotSupported'"
> add empty .bdrv_close
> add default .bdrv_child_perm
> 03: comparing to [PATCH v20 15/15] qemu-iotests: Image fleecing test case 08:
> add -f iotests.imgfmt to qemu_io
> fix target_img to be always qcow2
> add -r to qemu_io for nbd
> add fleecing-filter layer
> wrap long lines
>
> Fam Zheng (1):
> qemu-iotests: Image fleecing test case 222
>
> Vladimir Sementsov-Ogievskiy (2):
> blockdev-backup: enable non-root nodes for backup source
> block/fleecing-filter: new filter driver for fleecing
>
> qapi/block-core.json | 6 ++-
> block/fleecing-filter.c | 80 ++++++++++++++++++++++++++++++++
> blockdev.c | 4 +-
> block/Makefile.objs | 1 +
> tests/qemu-iotests/222 | 112
> +++++++++++++++++++++++++++++++++++++++++++++
> tests/qemu-iotests/222.out | 5 ++
> tests/qemu-iotests/group | 1 +
> 7 files changed, 205 insertions(+), 4 deletions(-)
> create mode 100644 block/fleecing-filter.c
> create mode 100755 tests/qemu-iotests/222
> create mode 100644 tests/qemu-iotests/222.out
>
Have you been able to reproduce a race that proves the filter is
necessary, or can you explain how it might happen?
I think I mentioned it once as a possibility but I hadn't convinced myself.
