Re: Outreachy project task: Adding QEMU block layer APIs resembling Linux ZBD ioctls.

[Stefan Hajnoczi]

On Mon, 30 May 2022 at 06:09, Sam Li <faithilikerun@gmail.com> wrote:
>
> Hi everyone,
> I'm Sam Li, working on the Outreachy project which is to add zoned
> device support to QEMU's virtio-blk emulation.
>
> For the first goal, adding QEMU block layer APIs resembling Linux ZBD
> ioctls, I think the naive approach would be to introduce a new stable
> struct zbd_zone descriptor for the library function interface. More
> specifically, what I'd like to add to the BlockDriver struct are:
> 1. zbd_info as zone block device information: includes numbers of
> zones, size of logical blocks, and physical blocks.
> 2. zbd_zone_type and zbd_zone_state
> 3. zbd_dev_model: host-managed zbd, host-aware zbd
> With those basic structs, we can start to implement new functions as
> bdrv*() APIs for BLOCK*ZONE ioctls.
>
> I'll start to finish this task based on the above description. If
> there is any problem or something I may miss in the design, please let
> me know.

Hi Sam,
Can you propose function prototypes for the new BlockDriver callbacks
needed for zoned devices?

Stefan