[Qemu-block] [PATCH v6 00/10] qemu-img convert with copy offloading

[Fam Zheng]

v6: Pick up rev-by from Stefan and Eric.
    Tweak patch 2 commit message.

v5: - Fix raw offset/bytes check for read. [Eric]
    - Fix qcow2_handle_l2meta. [Stefan]
    - Add coroutine_fn whereever appropriate. [Stefan]

v4: - Fix raw offset and size. [Eric]
    - iscsi: Drop unnecessary return values and variables in favor of
      constants. [Stefan]
    - qcow2: Handle small backing case. [Stefan]
    - file-posix: Translate ENOSYS to ENOTSUP. [Stefan]
    - API documentation and commit message. [Stefan]
    - Add rev-by to patches 3, 5 - 10. [Stefan, Eric]

This series introduces block layer API for copy offloading and makes use of it
in qemu-img convert.

For now we implemented the operation in local file protocol with
copy_file_range(2).  Besides that it's possible to add similar to iscsi, nfs
and potentially more.

As far as its usage goes, in addition to qemu-img convert, we can emulate
offloading in scsi-disk (handle EXTENDED COPY command), and use the API in
block jobs too.

Fam Zheng (10):
  block: Introduce API for copy offloading
  raw: Check byte range uniformly
  raw: Implement copy offloading
  qcow2: Implement copy offloading
  file-posix: Implement bdrv_co_copy_range
  iscsi: Query and save device designator when opening
  iscsi: Create and use iscsi_co_wait_for_task
  iscsi: Implement copy offloading
  block-backend: Add blk_co_copy_range
  qemu-img: Convert with copy offloading

 block/block-backend.c          |  18 +++
 block/file-posix.c             |  96 ++++++++++++-
 block/io.c                     |  97 +++++++++++++
 block/iscsi.c                  | 314 ++++++++++++++++++++++++++++++++++++-----
 block/qcow2.c                  | 226 +++++++++++++++++++++++++----
 block/raw-format.c             |  96 +++++++++----
 include/block/block.h          |  32 +++++
 include/block/block_int.h      |  38 +++++
 include/block/raw-aio.h        |  10 +-
 include/scsi/constants.h       |   5 +
 include/sysemu/block-backend.h |   4 +
 qemu-img.c                     |  50 ++++++-
 12 files changed, 887 insertions(+), 99 deletions(-)

-- 
2.14.3