On 9/27/19 8:23 AM, Vladimir Sementsov-Ogievskiy wrote:
> Hi all!
>
> Bitmaps reopening is buggy, reopening-rw just not working at all and
> reopening-ro may lead to producing broken incremental
> backup if we do temporary snapshot in a meantime.
>
> v5:
> 01: - add Max's r-b
> - fix s/QSIMPLE_INIT/QTAILQ_INIT/ in a comment
> 02: - add Max's and John's a-b
> 03: - improve test to check bitmap hashes in more safe way
> 07: - drop wrong statement from commit message
> - log events by hand
> 08: - drop 'the' from comment
> - add Corruption in case of existent IN_USE on RO->RW reopen
> 09: - add Max's a-b and John's r-b
>
> v4: Drop complicated solution around reopening logic [Kevin], fix
> the existing bug in a simplest way
>
> Vladimir Sementsov-Ogievskiy (9):
> block: switch reopen queue from QSIMPLEQ to QTAILQ
> block: reverse order for reopen commits
> iotests: add test-case to 165 to test reopening qcow2 bitmaps to RW
> block/qcow2-bitmap: get rid of bdrv_has_changed_persistent_bitmaps
> block/qcow2-bitmap: drop qcow2_reopen_bitmaps_rw_hint()
> block/qcow2-bitmap: do not remove bitmaps on reopen-ro
> iotests: add test 260 to check bitmap life after snapshot + commit
> block/qcow2-bitmap: fix and improve qcow2_reopen_bitmaps_rw
> qcow2-bitmap: move bitmap reopen-rw code to qcow2_reopen_commit
>
> block/qcow2.h | 5 +-
> include/block/block.h | 2 +-
> include/block/block_int.h | 6 --
> include/block/dirty-bitmap.h | 1 -
> block.c | 53 +++++------
> block/dirty-bitmap.c | 12 ---
> block/qcow2-bitmap.c | 164 ++++++++++++++++++++++-------------
> block/qcow2.c | 17 +++-
> tests/qemu-iotests/165 | 57 +++++++++++-
> tests/qemu-iotests/165.out | 4 +-
> tests/qemu-iotests/260 | 89 +++++++++++++++++++
> tests/qemu-iotests/260.out | 52 +++++++++++
> tests/qemu-iotests/group | 1 +
> 13 files changed, 343 insertions(+), 120 deletions(-)
> create mode 100755 tests/qemu-iotests/260
> create mode 100644 tests/qemu-iotests/260.out
>
With the understanding that there are caveats that make this unsafe, but
less unsafe and is a strict improvement:
Reviewed-by: John Snow <js...@redhat.com>
