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

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Message-ID: <Z3v17kZYZnvYPpsl@infradead.org>
Date: Mon, 6 Jan 2025 07:25:34 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Tomas Mudrunka <tomas.mudrunka@...il.com>
Cc: 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 Tue, Dec 31, 2024 at 04:09:27AM +0100, Tomas Mudrunka wrote:
> When working on software that manages MD RAID disks from
> userspace. Currently provided headers only contain MD superblock.
> That is not enough to fully populate MD RAID metadata.
> Therefore this patch adds bitmap superblock as well.

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.