Re: [Qemu-devel] [PATCH 0/6] block: Enable byte granularity I/O

[Stefan Hajnoczi]

On Wed, Jun 08, 2016 at 04:10:05PM +0200, Kevin Wolf wrote:
> Previous series have already converted some block drivers to byte-based rather
> than sector-based interfaces. However, the common I/O path as well as 
> raw-posix
> still enforced a minimum alignment of 512 bytes because some sector-based 
> logic
> was involved.
> 
> This patch series removes these limitations and a sub-sector request actually
> ends up as a sub-sector syscall now.
> 
> Kevin Wolf (6):
>   block: Byte-based bdrv_co_do_copy_on_readv()
>   block: Prepare bdrv_aligned_preadv() for byte-aligned requests
>   block: Prepare bdrv_aligned_pwritev() for byte-aligned requests
>   raw-posix: Switch to bdrv_co_* interfaces
>   raw-posix: Implement .bdrv_co_preadv/pwritev
>   block: Don't enforce 512 byte minimum alignment
> 
>  block.c               |   2 +-
>  block/io.c            | 125 
> +++++++++++++++++++++++++-------------------------
>  block/linux-aio.c     |  83 ++++++++++++++++++++++++---------
>  block/mirror.c        |  10 ++--
>  block/raw-aio.h       |   2 +
>  block/raw-posix.c     |  61 ++++++++++++------------
>  include/block/block.h |  10 ++--
>  7 files changed, 169 insertions(+), 124 deletions(-)

I've taken an initial look and it looks good.  Will review next revision
in depth so it can be merged after Eric's comments have been addressed.

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