[Qemu-devel] [PATCH for-2.7 v2 00/19] byte-based block discard

[Eric Blake <eblake@redhat.com>]

Allow NBD to pass a byte-aligned discard request over the wire.

Prerequisite: Kevin's block branch merged with current qemu.git master,
plus my work on auto-fragmenting (v3 at the moment):
https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg03550.html

Also available as a tag at:
git fetch git://repo.or.cz/qemu/ericb.git nbd-discard-v2

This is a merge of two series both posted before soft freeze, both
of which had initial positive review with only a few changes needed:
byte-based block discard
https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg06491.html
Switch raw NBD to byte-based
https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg07030.html

I'd still hoping for one other series to make it into 2.7, based
on being posted prior to soft freeze:
nbd: efficient write zeroes
https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg07463.html

Changes since v1:
- rebase to latest master (several contextual conflicts)
- fix bug with aio_pdiscard using a stack variable qiov after
its scope ends
- tweak raw_bsd to remain sector-based if probing occurred

001/19:[----] [--] 'block: Convert bdrv_co_discard() to byte-based'
002/19:[0004] [FC] 'block: Convert bdrv_discard() to byte-based'
003/19:[0034] [FC] 'block: Switch BlockRequest to byte-based'
004/19:[0008] [FC] 'block: Convert bdrv_aio_discard() to byte-based'
005/19:[----] [--] 'block: Convert BB interface to byte-based discards'
006/19:[----] [--] 'raw-posix: Switch paio_submit() to byte-based'
007/19:[----] [--] 'rbd: Switch rbd_start_aio() to byte-based'
008/19:[----] [--] 'block: Convert .bdrv_aio_discard() to byte-based'
009/19:[----] [--] 'block: Add .bdrv_co_pdiscard() driver callback'
010/19:[----] [-C] 'blkreplay: Switch .bdrv_co_discard() to byte-based'
011/19:[----] [--] 'gluster: Switch .bdrv_co_discard() to byte-based'
012/19:[----] [--] 'iscsi: Switch .bdrv_co_discard() to byte-based'
013/19:[----] [--] 'nbd: Switch .bdrv_co_discard() to byte-based'
014/19:[----] [--] 'qcow2: Switch .bdrv_co_discard() to byte-based'
015/19:[----] [-C] 'raw_bsd: Switch .bdrv_co_discard() to byte-based'
016/19:[----] [--] 'sheepdog: Switch .bdrv_co_discard() to byte-based'
017/19:[----] [--] 'block: Kill .bdrv_co_discard()'
018/19:[----] [--] 'nbd: Convert to byte-based interface'
019/19:[0028] [FC] 'raw_bsd: Convert to byte-based interface'

Eric Blake (19):
  block: Convert bdrv_co_discard() to byte-based
  block: Convert bdrv_discard() to byte-based
  block: Switch BlockRequest to byte-based
  block: Convert bdrv_aio_discard() to byte-based
  block: Convert BB interface to byte-based discards
  raw-posix: Switch paio_submit() to byte-based
  rbd: Switch rbd_start_aio() to byte-based
  block: Convert .bdrv_aio_discard() to byte-based
  block: Add .bdrv_co_pdiscard() driver callback
  blkreplay: Switch .bdrv_co_discard() to byte-based
  gluster: Switch .bdrv_co_discard() to byte-based
  iscsi: Switch .bdrv_co_discard() to byte-based
  nbd: Switch .bdrv_co_discard() to byte-based
  qcow2: Switch .bdrv_co_discard() to byte-based
  raw_bsd: Switch .bdrv_co_discard() to byte-based
  sheepdog: Switch .bdrv_co_discard() to byte-based
  block: Kill .bdrv_co_discard()
  nbd: Convert to byte-based interface
  raw_bsd: Convert to byte-based interface

 block/nbd-client.h             |  11 ++-
 include/block/block.h          |  10 +--
 include/block/block_int.h      |   8 +--
 include/block/nbd.h            |   1 -
 include/sysemu/block-backend.h |   9 ++-
 block/blkreplay.c              |   8 +--
 block/block-backend.c          |  22 +++---
 block/gluster.c                |  14 ++--
 block/io.c                     | 154 ++++++++++++++++++++---------------------
 block/iscsi.c                  |  18 +++--
 block/mirror.c                 |   5 +-
 block/nbd-client.c             |  41 ++++++-----
 block/nbd.c                    |  24 +++----
 block/qcow2-refcount.c         |   4 +-
 block/qcow2.c                  |  10 +--
 block/raw-posix.c              |  24 +++----
 block/raw-win32.c              |  19 ++---
 block/raw_bsd.c                |  53 ++++++++------
 block/rbd.c                    |  29 ++++----
 block/sheepdog.c               |  17 +++--
 hw/block/xen_disk.c            |   7 +-
 hw/ide/core.c                  |   6 +-
 hw/scsi/scsi-disk.c            |   8 +--
 nbd/server.c                   |  19 ++---
 qemu-io-cmds.c                 |   3 +-
 block/trace-events             |   4 +-
 26 files changed, 260 insertions(+), 268 deletions(-)

-- 
2.5.5