linux-kernel - Re: [PATCH] Export MDRAID bitmap on disk structure in UAPI header file

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Message-ID: <Z3v6khutPZEXkK-j@infradead.org>
Date: Mon, 6 Jan 2025 07:45:22 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Tomáš Mudruňka <tomas.mudrunka@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>, Song Liu <song@...nel.org>,
	Yu Kuai <yukuai3@...wei.com>, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Export MDRAID bitmap on disk structure in UAPI header
 file

On Mon, Jan 06, 2025 at 04:40:52PM +0100, Tomáš Mudruňka wrote:
> > the bitmap format is not a userspace ABI, it is an on-disk format.
> > As such it does not belong into the uapi.  It might make sense to
> > create a clean standalone header just for the on-disk format that
> > you could copy, though.
> 
> If you inspect the header in question, you'll find that this is the exact
> reason why this header exists. To describe "physical layout" of
> MD RAID devices. Which is just fancy way to say "on disk format".

Well, then MD already gets it wrong.  No reason to do more of the same.