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Date: Wed, 15 Apr 2026 07:22:03 +0200
From: Christoph Hellwig <hch@lst.de>
To: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Zorro Lang <zlang@redhat.com>, Naohiro Aota <naohiro.aota@wdc.com>,
	fstests@vger.kernel.org, linux-btrfs@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3] fstests: test premature ENOSPC in zoned garbage
 collection
Message-ID: <20260415052203.GB26443@lst.de>
References: <20260414143341.167875-1-johannes.thumshirn@wdc.com>
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On Tue, Apr 14, 2026 at 04:33:41PM +0200, Johannes Thumshirn wrote:
> This test stresses garbage collection in zoned file systems by
> constantly overwriting the same file. It is inspired by a reproducer for
> a btrfs bugifx.

s/bugifx/bugfix/

I tried this on XFS, and it doesn't work as XFS uses SCRATCH_RTDEV for
zoned data.  Manually hacking in SCRATCH_RTDEV makes it work, but that
will break btrfs.  Maybe you can add a little:

if [ -b "$SCRATCH_RTDEV" ];
	zoned_dev=$SCRATCH_RTDEV
else
	zoned_dev=$SCRATCH_DEV
endif

end then use $zoned_dev to make it portable?

I also tried it on f2fs, but mkfs.f2fs fails now with a 'different sector
sizes' warning when using a 4k-sector conventional and 4k-sector zoned
ZNS namespace, so I guess I'll give up on that.