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.
v13 is queued in Max's branch, but I understand that new range locks don't work in backup case. So, I've to resend. v14: Drop range locks, keep old good in-flight requests waiting 12: new patch 14: use old request-waiting scheme instead of range locks Vladimir Sementsov-Ogievskiy (14): block/backup: fix max_transfer handling for copy_range 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: move in-flight requests handling from backup to block-copy 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 | 92 +++++ include/block/block_int.h | 1 + block.c | 34 +- block/backup-top.c | 240 ++++++++++++ block/backup.c | 440 ++++----------------- block/block-copy.c | 370 ++++++++++++++++++ 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 ++ 17 files changed, 1256 insertions(+), 909 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 -- 2.21.0
