Re: [PATCH 0/3] zone-append support in aio and io-uring

["Matias Bjørling" <mb@lightnvm.io>]

On 17/06/2020 19.23, Kanchan Joshi wrote:
> This patchset enables issuing zone-append using aio and io-uring direct-io interface.
>
> For aio, this introduces opcode IOCB_CMD_ZONE_APPEND. Application uses start LBA
> of the zone to issue append. On completion 'res2' field is used to return
> zone-relative offset.
>
> For io-uring, this introduces three opcodes: IORING_OP_ZONE_APPEND/APPENDV/APPENDV_FIXED.
> Since io_uring does not have aio-like res2, cqe->flags are repurposed to return zone-relative offset

Please provide a pointers to applications that are updated and ready to 
take advantage of zone append.

I do not believe it's beneficial at this point to change the libaio API, 
applications that would want to use this API, should anyway switch to 
use io_uring.

Please also note that applications and libraries that want to take 
advantage of zone append, can already use the zonefs file-system, as it 
will use the zone append command when applicable.

> Kanchan Joshi (1):
>    aio: add support for zone-append
>
> Selvakumar S (2):
>    fs,block: Introduce IOCB_ZONE_APPEND and direct-io handling
>    io_uring: add support for zone-append
>
>   fs/aio.c                      |  8 +++++
>   fs/block_dev.c                | 19 +++++++++++-
>   fs/io_uring.c                 | 72 +++++++++++++++++++++++++++++++++++++++++--
>   include/linux/fs.h            |  1 +
>   include/uapi/linux/aio_abi.h  |  1 +
>   include/uapi/linux/io_uring.h |  8 ++++-
>   6 files changed, 105 insertions(+), 4 deletions(-)
>