linux-kernel - Re: [PATCH] stat: don't fail if the major number is >= 256

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Message-ID: <YlUQ9fnc+4eP3AE5@infradead.org>
Date:   Mon, 11 Apr 2022 22:41:09 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Mikulas Patocka <mpatocka@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] stat: don't fail if the major number is >= 256

On Mon, Apr 11, 2022 at 07:37:44PM -1000, Linus Torvalds wrote:
> Realistically, nobody uses it. Apparently your OpenWatcom use is also
> really just fairly theoretical, not some "this app is used by people
> and doesn't work with a filesystem on NVMe".

And that is easily fixed by using a lower major for the block dynamic
dev_t.  In theory userspace should be able to copy with any major for
it, but I fear something might break so we could make it configurable.