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Date: Tue, 16 Dec 2025 06:13:28 +0100
From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>, Zorro Lang <zlang@kernel.org>,
	fstests@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 3/3] xfs: add a test that mkfs round up realtime
 subvolume sizes to the zone size
Message-ID: <20251216051328.GD26237@lst.de>
References: <20251215095036.537938-1-hch@lst.de> <20251215095036.537938-4-hch@lst.de> <20251215192552.GK7725@frogsfrogsfrogs>
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On Mon, Dec 15, 2025 at 11:25:52AM -0800, Darrick J. Wong wrote:
> > +# the zone size to create mountable file systems.
> 
> What size rt volume does this create?  It looks like you're specifying
> an rt zone size of ... (1GB + 52K)?

Yes.

> And testing that mkfs rounds the
> rt volume size down to some multiple of that?  Or is it rounding the
> *zone* size down to 1G?

That's it is rounding the RT device sizse down to a multiple of the
zone size, for which we default to 256MiB if not specified.