[Qemu-block] [PATCH v4 0/3] backup: Use copy offloading

[Fam Zheng]

v4: Rebase to master.
    Pick up Stefan's rev-bys.
    Include a block/io.c fix to fix a new issue caused by recent block/io.c
    change - our drive-backup cases in iotests exposes the bug loudly.

This enhances the backup job to make use of the copy offloading API. It
eliminates the necessity to use the bounce buffer as well as speeding up the
copy operation when the backend supports it.

v3: Don't forget coroutine_fn. [Stefan]
    Don't reset job->use_copy_range redundantly. [Stefan]

v2: Use helper functions. [Stefan]

Fam Zheng (3):
  block: Fix parameter checking in bdrv_co_copy_range_internal
  block: Honour BDRV_REQ_NO_SERIALISING in copy range
  backup: Use copy offloading

 block/backup.c        | 150 ++++++++++++++++++++++++++++++------------
 block/io.c            |  35 +++++-----
 block/trace-events    |   1 +
 include/block/block.h |   5 +-
 4 files changed, 132 insertions(+), 59 deletions(-)

-- 
2.17.1