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Date:   Mon, 18 Oct 2021 17:18:11 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Coly Li <colyli@suse.de>
Cc:     Arnd Bergmann <arnd@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Jens Axboe <axboe@kernel.dk>,
        Kent Overstreet <kmo@daterainc.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] [v2] bcache: hide variable-sized types from uapi
 header check
Message-ID: <20211018151811.GA30977@lst.de>
References: <20210928085554.2299495-1-arnd@kernel.org> <ce05e90b-f22f-bd0e-4e0f-da560bffc0c2@suse.de> <CAK8P3a1brJNoq65h15-zZtNgwV92hwXH9p32cJpzAY3=ouOHnw@mail.gmail.com> <12a593bc-68bc-ac03-0307-a65a0c064af3@suse.de>
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On Mon, Oct 18, 2021 at 10:42:37PM +0800, Coly Li wrote:
> I am quite open for this idea. It is in uapi directory before I maintain 
> bcache. I just though the header fines on-media format should go into 
> include/uapi/, but if this is not the restricted rule, it is fine for me to 
> move this header to drivers/md/bcache/.

Having the on-disk format in uapi seems weird.  It isn't a userspace
ABI in any way.