Re: [Qemu-devel] [PATCH v4 0/6] virtio-blk: add DISCARD and WRITE_ZEROES features

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Feb 08, 2019 at 02:49:44PM +0100, Stefano Garzarella wrote:
> This series adds the support of DISCARD and WRITE_ZEROES commands
> and extends the virtio-blk-test to test WRITE_ZEROES command when
> the feature is enabled.

Looking at how this wasn't merged yet, maybe it's not too late.

Series:

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>


> v4:
> - fixed error with mingw compiler in patch 4
>   gcc and clang want %lu, but mingw wants %llu for BDRV_REQUEST_MAX_SECTORS.
>   Since is less than INT_MAX, I casted it to integer and I used %d in the
>   format string of error_setg. (mingw now is happy)
> 
> v3:
> - rebased on master (I removed Based-on tag since the new virtio headers from
>   linux v5.0-rc1 are merged)
> - added patch 2 to add host_features field (as in virtio-net) [Michael]
> - fixed patch 3 (previously 2/5) using the new host_features field
> - fixed patch 4 (previously 3/5) following the Stefan's comments:
>                 - fixed name of functions and fields
>                 - used vdev and s pointers
>                 - removed "wz-may-unmap" property
>                 - split "dwz-max-sectors" in two properties
> 
> v2:
> - added patch 1 to use virtio_blk_handle_rw_error() with discard operation
> - added patch 2 to make those new features machine-type dependent (thanks David)
> - fixed patch 3 (previously patch 1/2) adding more checks, block_acct_start()
>                 for WRITE_ZEROES requests, and configurable parameters to
>                 initialize the limits (max_sectors, wzeroes_may_unmap).
>                 (thanks Stefan)
>                 I moved in a new function the code to handle a single segment,
>                 in order to simplify the support of multiple segments in the
>                 future.
> - added patch 4 to change the assert on data_size following the discussion with
>                 Thomas, Changpeng, Michael, and Stefan (thanks all)
> - fixed patch 5 (previously patch 2/2) using local dwz_hdr variable instead of
>                 dynamic allocation (thanks Thomas)
> 
> Thanks,
> Stefano
> 
> Stefano Garzarella (6):
>   virtio-blk: add acct_failed param to virtio_blk_handle_rw_error()
>   virtio-blk: add host_features field in VirtIOBlock
>   virtio-blk: add "discard" and "write-zeroes" properties
>   virtio-blk: add DISCARD and WRITE_ZEROES features
>   tests/virtio-blk: change assert on data_size in virtio_blk_request()
>   tests/virtio-blk: add test for WRITE_ZEROES command
> 
>  hw/block/virtio-blk.c          | 214 +++++++++++++++++++++++++++++++--
>  hw/core/machine.c              |   2 +
>  include/hw/virtio/virtio-blk.h |   5 +-
>  tests/virtio-blk-test.c        |  75 +++++++++++-
>  4 files changed, 282 insertions(+), 14 deletions(-)
> 
> -- 
> 2.20.1