linux-kernel - Re: [RFC] fs: add userspace critical mounts event support

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Date:   Tue, 4 Oct 2016 18:58:06 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Josh Triplett <josh@...htriplett.org>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "Herbert, Marc" <marc.herbert@...el.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Andy Lutomirski <luto@...capital.net>,
        Richard Purdie <rpurdie@...ys.net>,
        Wu Fengguang <fengguang.wu@...el.com>,
        Johannes Berg <johannes@...solutions.net>,
        Michal Marek <mmarek@...e.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Mark Brown <broonie@...nel.org>, Jiri Slaby <jslaby@...e.com>,
        Ming Lei <ming.lei@...onical.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Felix Fietkau <nbd@....name>, Roman Pen <r.peniaev@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Vikram Mulukutla <markivx@...eaurora.org>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Takashi Iwai <tiwai@...e.de>, Jeff Mahoney <jeffm@...e.com>,
        Hariprasad S <hariprasad@...lsio.com>,
        Benjamin Poirier <bpoirier@...e.de>,
        Kees Cook <keescook@...gle.com>
Subject: Re: [RFC] fs: add userspace critical mounts event support

On Tue, Oct 4, 2016 at 6:48 PM, Josh Triplett <josh@...htriplett.org> wrote:
>
>    I definitely don't think it
> should be a system-wide "mount event"; it should be a per-device "go
> direct-load your firmware" poke from userspace.

I don't disagree with that kind of interface. We already have things
like "rescan" for PCI bus devices to force a bus rescan. Iit's a
simple device attribute. Having a similar thing to trigger firmware
reload for a driver sounds entirely sane.

              Linus