Re: [PATCH v4 4/4] ublk: add zone append

On 6/29/23 18:17, Andreas Hindborg (Samsung) wrote:

Ming Lei [off-list ref] writes:

quoted

On Wed, Jun 28, 2023 at 09:06:49PM +0200, Andreas Hindborg wrote:

quoted

From: Andreas Hindborg <redacted>

Add zone append feature to ublk. This feature uses the `addr` field of `struct
ublksrv_io_cmd`. Therefore ublk must be used with the user copy
feature (UBLK_F_USER_COPY) for zone append to be available. Without this
feature, ublk will fail zone append requests.

Given zone append is a must, please fail to add device in case of zoned
and !user_copy, then we can make fast IO code path clean.

I will squash the patches and reject zone support if not user copy is
enabled 👍

Or if !CONFIG_BLK_DEV_ZONED or if the user specifies a bad parameter (invalid
limits etc).

-- 
Damien Le Moal
Western Digital Research