Re: [PATCH v3] fstests: test premature ENOSPC in zoned garbage collection

[Christoph Hellwig <hch@lst.de>]

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.