Re: [PATCH v3 0/4] block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF

[Stefan Hajnoczi]

On Wed, Feb 01, 2023 at 10:27:47AM -0500, Stefan Hajnoczi wrote:
> v3:
> - Restore alphabetical order in getopt strings [Eric]
> v2:
> - Add comment explaining unbalanced error code path in
>   qemu_io_alloc_from_file() [Eric]
> - List options alphabetically in help output [Eric]
> - Add Tested-by/Reviewed-by
> - CC qemu-stable on the fix
> 
> The first patch fixes a regression in QEMU 7.2 where detect-zeroes breaks with
> virtio-blk devices due to a BDRV_REQ_REGISTERED_BUF bug. Details of the
> regression can be found here:
> https://gitlab.com/qemu-project/qemu/-/issues/1404
> 
> The remaining patches add a regression test that will protect this code path 
> in
> the future. The qemu-io command is extended with the new -r option that calls
> blk_register_buf(). This allows a qemu-iotests test case to trigger the same
> bug as virtio-blk.
> 
> Stefan Hajnoczi (4):
>   block: fix detect-zeroes= with BDRV_REQ_REGISTERED_BUF
>   qemu-io: use BdrvRequestFlags instead of int
>   qemu-io: add -r option to register I/O buffer
>   iotests/detect-zeroes-registered-buf: add new test
> 
>  block/io.c                                    |   3 +
>  qemu-io-cmds.c                                | 180 ++++++++++++------
>  .../tests/detect-zeroes-registered-buf        |  58 ++++++
>  .../tests/detect-zeroes-registered-buf.out    |   7 +
>  4 files changed, 189 insertions(+), 59 deletions(-)
>  create mode 100755 tests/qemu-iotests/tests/detect-zeroes-registered-buf
>  create mode 100644 tests/qemu-iotests/tests/detect-zeroes-registered-buf.out

Hi Kevin and Hanna,
Would you like to review this or should I go ahead and merge it?

Stefan

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