[Qemu-devel] [PATCH v2 00/20] block & scsi: write_zeroes support through the whole stack

[Paolo Bonzini <pbonzini@redhat.com>]

This series fixes the implementation of WRITE SAME in the SCSI emulation
layer.  On top of this, it ensures that zero writes from the guest can
be offloaded to the host device or filesystem if that's supported.
This is a relatively important part of the thin provisioning feature,
and builds on the unmap flag to write_zeroes, recently added by Peter
Lieven.  The feature works with iscsi, block device and filesystem
targets.

v1->v2
        I cleaned up the series, putting all the block layer changes
        together and all the SCSI changes at the end.

        qcow2 and iscsi are now better covered, which caused the
        introduction of patches 6-11.  I also downloaded the latest
        which contributed some changes in patches 10-11.  It turns
        out we were too cautious in treating LBPRZ as advisory when
        using the UNMAP command.  On the other hand, the API we
        introduced is useful for qcow2/qed/vmdk WRITE SAME, so no
        damage done.

        Patch 3 is also new.

Paolo Bonzini (18):
  block: generalize BlockLimits handling to cover bdrv_aio_discard too
  block: add flags to BlockRequest
  block: add flags argument to bdrv_co_write_zeroes tracepoint
  block: add bdrv_aio_write_zeroes
  block: handle ENOTSUP from discard in generic code
  block: make bdrv_co_do_write_zeroes stricter in producing aligned requests
  vpc, vhdx: add get_info
  block drivers: add discard/write_zeroes properties to bdrv_get_info implementation
  block drivers: expose requirement for write same alignment from formats
  block/iscsi: check WRITE SAME support differently depending on MAY_UNMAP
  block/iscsi: use UNMAP to write zeroes if LBPRZ=1
  raw-posix: implement write_zeroes with MAY_UNMAP for files
  raw-posix: implement write_zeroes with MAY_UNMAP for block devices
  raw-posix: add support for write_zeroes on XFS and block devices
  qemu-iotests: 033 is fast
  scsi-disk: catch write protection errors in UNMAP
  scsi-disk: reject ANCHOR=1 for UNMAP and WRITE SAME commands
  scsi-disk: correctly implement WRITE SAME

Peter Lieven (2):
  block/iscsi: remove .bdrv_has_zero_init
  block/iscsi: updated copyright

 block.c                  | 140 ++++++++++++++++++++-----------------
 block/iscsi.c            |  32 ++++++---
 block/qcow2.c            |   3 +
 block/qed.c              |   3 +
 block/raw-aio.h          |   3 +-
 block/raw-posix.c        | 175 ++++++++++++++++++++++++++++++++++++++++++++---
 block/vdi.c              |   3 +
 block/vhdx.c             |  14 ++++
 block/vmdk.c             |   4 ++
 block/vpc.c              |  16 +++++
 hw/scsi/scsi-disk.c      | 154 ++++++++++++++++++++++++++++++++++-------
 include/block/block.h    |   4 ++
 tests/qemu-iotests/group |   2 +-
 trace-events             |   4 +-
 14 files changed, 452 insertions(+), 105 deletions(-)

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1.8.4.2