Re: [PATCH] virtio-blk: Fix zone append sector reporting in batched completion

[Christoph Hellwig <hch@lst.de>]

On Tue, Nov 03, 2026 at 09:02:23AM +0100, Christoph Hellwig wrote:
> On Wed, Oct 28, 2026 at 10:27:08AM +0800, shao.mingyin@zte.com.cn wrote:
> > I looked into adding blktests coverage, and there is a structural
> > problem. blktests cannot issue REQ_OP_ZONE_APPEND from userspace: fio's
> > --zone_append goes through the io_uring_cmd NVMe passthrough path, so it
> > never reaches the driver's zone-append completion, and zbdioctl has no
> > append operation. blktests has no zone-append test today for the same
> > reason.
> 
> Right.
> 
> > That does not fit blktests, which is a block-layer test suite driven
> > from userspace. Two options as I see it:
> > 
> >   1. an XFS reproducer (e.g. xfstests) - the one that actually
> >      exercises the append completion path, or
> >   2. a blktests zbd test that covers a zoned virtio-blk with poll
> >      queues, which would not reach the append part itself.
> > 
> > I am happy to write either, or to leave it if you think the coverage
> > is not worth the churn. Which do you prefer?
> 
> We do have some blktests test that use a file system in the zbd
> category (zbd/009, zbd/010, zbd/014) so I think we could do this in
> blktests.  I.e. do a blktest that tests zoned polled I/O if we're
> on a zoned device that support polling.

OTOH xfstests might actually still fit better for this.  I guess
eiter way will work..