[Qemu-devel] [PATCH v10 00/14] backup-top filter driver for backup

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

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.

v10 (mostly by Max's comments):

01: - s/MIN(end - start, job->len - start)/MIN(end, job->len) - start
    - Max's r-b
02: s/offset/start/ and drop extra variable from backup_do_copy
03: new
04: - add job->source_bs
    - use two progress callbacks instead of one combined
    - add comment to skip_unallocated
    - drop zeroing blk's in block_copy_state_free
    - s/g_new0/g_new/ before compound literal
    - add comment and assertion about aio context for block-copy source and target
    - in backup_clean handle possibly executing in parallel backup_drain and check
      only s->bcs pointer in backup_drain
    - fix s/job/bcs in trace-events file
05: partly new, now only fix comments style
06: a lot of changes as rebased on above changes, but it's still a clean
    code move, keep Max's r-b
07: add Max's r-b
08: deeper refactoring of tests
09-11: add Max's r-b
   [also, fix my email in 11]
12: - drop bdrv_refresh_filename(bs->backing->bs) call
    - drop assertion of taken permission
    - active = false + refresh_perms in _drop() instead of _set_perm()
13: - add comment about WRITE perm sharing
    - add backup_top bs to job state
    - fix cleanup on failure path in backup_job_create
    - keep "fail:" path in block_copy_with_bounce_buffer
    - in 56, collide on job-id instead of posix locks


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    |  75 ++++
 include/block/block_int.h     |   5 +
 block.c                       |  34 +-
 block/backup-top.c            | 240 ++++++++++++
 block/backup.c                | 454 +++++----------------
 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, 1281 insertions(+), 920 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