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[Qemu-devel] [PATCH 00/11] block & scsi: write_zeroes support through th


From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH 00/11] block & scsi: write_zeroes support through the whole stack
Date: Tue, 12 Nov 2013 16:49:38 +0100

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.

The block layer patches are 1-3 (adding prerequisites for using the
feature in scsi-disk) and 7-11 (which support the feature on non-iscsi
targets).

Paolo Bonzini (11):
  block: generalize BlockLimits handling to cover bdrv_aio_discard too
  block: add flags to BlockRequest
  block: add bdrv_aio_write_zeroes
  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
  block: handle ENOTSUP from discard in generic code
  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

 block.c                  | 108 +++++++++++++++++------------
 block/raw-aio.h          |   3 +-
 block/raw-posix.c        | 173 +++++++++++++++++++++++++++++++++++++++++++++--
 hw/scsi/scsi-disk.c      | 154 ++++++++++++++++++++++++++++++++++-------
 include/block/block.h    |   4 ++
 tests/qemu-iotests/group |   2 +-
 trace-events             |   2 +
 7 files changed, 369 insertions(+), 77 deletions(-)

-- 
1.8.4.2




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