linux-kernel - Re: [PATCH 36/38] vfs: Add a sample program for the new mount API [ver #10]

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Message-ID: <20180730212300.GA17452@amd>
Date:   Mon, 30 Jul 2018 23:23:00 +0200
From:   Pavel Machek <pavel@....cz>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Matthew Wilcox <willy@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 36/38] vfs: Add a sample program for the new mount API
 [ver #10]

On Mon 2018-07-30 17:02:09, Theodore Y. Ts'o wrote:
> On Mon, Jul 30, 2018 at 12:49:38PM -0700, Matthew Wilcox wrote:
> > > That said, people have wanted these kinds of extended error
> > > descriptors forever, and the reason we haven't added them is that it
> > > generally is more pain than it is necessarily worth. I'm not actually
> > > at all convinced that has magically changed with the mount
> > > configuration thing.
> > 
> > I'm not convinced we want to do this either, but if there's anywhere we
> > do want to do it then mount seems like one of the few places it might be
> > worth doing.  The reasons that a mount failed are many, and it doesn't
> > seem like a good idea to introduce a new errno every time a network
> > filesystem finds a new failure mode.
> 
> We've lived without VMS-style error reporting for a long time, and it
> *that* much of a real problem.  Even with network file systems, I

?

> So it might be that we're seriously over-thinking things.  Most of the
> really complicated error messages are at connection setup time, and
> that can be done in userspace, and then userspace can handle all of
> that awful gettext, or VMS-style error messages, or whatever other
> horrors the I18N community want to inflict on us.  :-)

Well, this is designing brand-new error reporting channel to the
userspace. I see that changing dmesg to provide something usable for
gettext would be hard, but it is quite trivial to do it right this
time.

I agree we survived without that for a long time, but we have chance
to do it right for a minimum price (because the interface is new we
don't need compatibility).

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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