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Date: Tue, 17 Dec 2024 05:15:15 +0100
From: Christoph Hellwig <hch@lst.de>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Damien Le Moal <dlemoal@kernel.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: Zoned storage and BLK_STS_RESOURCE
Message-ID: <20241217041515.GA15100@lst.de>
References: <e75812ec-9b91-42d0-9ca5-d4bae031e319@acm.org>
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On Mon, Dec 16, 2024 at 11:24:24AM -0800, Bart Van Assche wrote:
>
> Hi Damien,
>
> If 'qd=1' is changed into 'qd=2' in tests/zbd/012 then this test fails
> against all kernel versions I tried, including kernel version 6.9. Do
> you agree that this test should pass?

That test case is not very well documented and you're not explaining
how it fails.

As far as I can tell the test uses fio to write to a SCSI debug device
using the zbd randwrite mode and the io_uring I/O engine of fio.

We've ever guaranteed ordering of multiple outstanding asynchronous user
writes on zoned block devices, so from that point of view a "failure" due
to write pointer violations when changing the test to use QD=2 is
entirely expected.