This series introduces a bottom intermediate node that eliminates the dependency on the base that may change while stream job is running. It happens when stream/commit parallel jobs are running on the same backing chain. The base node of the stream job may be a top node of the parallel commit job and can change before the stream job is completed. We avoid that dependency by introducing the bottom node.
v2: The function bdrv_find_overlay() with the same functionality has been used in the qmp_block_stream() to find a bottom node. The algorithm in the bdrv_do_is_allocated_above() was simplified. The commit messages were modified. Discussed in the e-mail threads with the message IDs <1553866154-257311-1-git-send-email-andrey.shinkev...@virtuozzo.com> <1550762799-830661-1-git-send-email-andrey.shinkev...@virtuozzo.com> Andrey Shinkevich (2): block: include base when checking image chain for block allocation block/stream: introduce a bottom node Vladimir Sementsov-Ogievskiy (1): block/stream: refactor stream_run: drop goto block/io.c | 32 ++++++++++++++++++---- block/stream.c | 67 ++++++++++++++++++++++------------------------- block/trace-events | 2 +- blockdev.c | 7 ++++- include/block/block.h | 5 +++- include/block/block_int.h | 6 ++--- tests/qemu-iotests/245 | 4 +-- 7 files changed, 74 insertions(+), 49 deletions(-) -- 1.8.3.1
