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(-)
--
1.8.4.2
