Hi all! These series introduce backup-top driver. It's a filter-node, which do copy-before-write operation. Mirror uses filter-node for handling guest writes, let's move to filter-node (from write-notifiers) for backup too.
v11: based on Kevin's block branch 02,03: Add Max's r-b 04: - improve comments - rebase on dropped backup_drain - s/job/bcs/ in trace events 05: one hunk dropped due to rebasing on dropped backup_drain, still, keep Max's r-b 06: rebased on 04 changes, keep Max's r-b 08,13,14: add Max's r-b Based-on: git://repo.or.cz/qemu/kevin.git block Vladimir Sementsov-Ogievskiy (14): block/backup: fix backup_cow_with_offload for last cluster block/backup: split shareable copying part from backup_do_cow block/backup: improve comment about image fleecing block/backup: introduce BlockCopyState block/backup: fix block-comment style block: move block_copy from block/backup.c to separate file block: teach bdrv_debug_breakpoint skip filters with backing iotests: prepare 124 and 257 bitmap querying for backup-top filter iotests: 257: drop unused Drive.device field iotests: 257: drop device_add block/io: refactor wait_serialising_requests block: add lock/unlock range functions block: introduce backup-top filter driver block/backup: use backup-top instead of write notifiers qapi/block-core.json | 8 +- block/backup-top.h | 37 ++ include/block/block-copy.h | 84 ++++ include/block/block_int.h | 5 + block.c | 34 +- block/backup-top.c | 240 ++++++++++++ block/backup.c | 440 ++++----------------- block/block-copy.c | 337 ++++++++++++++++ block/io.c | 68 +++- block/replication.c | 2 +- blockdev.c | 1 + block/Makefile.objs | 3 + block/trace-events | 14 +- tests/qemu-iotests/056 | 8 +- tests/qemu-iotests/124 | 83 ++-- tests/qemu-iotests/257 | 91 ++--- tests/qemu-iotests/257.out | 714 ++++++++++++++-------------------- tests/qemu-iotests/iotests.py | 27 ++ 18 files changed, 1278 insertions(+), 918 deletions(-) create mode 100644 block/backup-top.h create mode 100644 include/block/block-copy.h create mode 100644 block/backup-top.c create mode 100644 block/block-copy.c -- 2.18.0