linux-kernel - Re: [PATCH] cachefiles: allocate static minor for /dev/cachefiles

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Message-ID: <1886146.1687441374@warthog.procyon.org.uk>
Date:   Thu, 22 Jun 2023 14:42:54 +0100
From:   David Howells <dhowells@...hat.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH] cachefiles: allocate static minor for /dev/cachefiles

Marcel Holtmann <marcel@...tmann.org> wrote:

> The cachefiles misc character device uses MISC_DYNAMIC_MINOR and thus
> doesn't support module auto-loading. Assign a static minor number for it
> and provide appropriate module aliases for it. This is enough for kmod to
> create the /dev/cachefiles device node on startup and facility module
> auto-loading.

Why?  The systemd unit file for it just modprobe's the module first.  It's a
specialist device file only for use by the appropriate daemon.

David