linux-kernel - Re: [PATCH] fuse: Add support for fuse stacked I/O

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Message-ID: <CALCETrWNQ9ytw1bCOOjFJRstauYc6DocQAmZCF61CErAJ5BF2g@mail.gmail.com>
Date:	Fri, 15 Jan 2016 08:31:25 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Greg KH <gregkh@...uxfoundation.org>,
	Nikhilesh Reddy <reddyn@...eaurora.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Nikolaus Rath <nikolaus@...h.org>,
	Linux API <linux-api@...r.kernel.org>, Jan Kara <jack@...e.cz>,
	"Theodore Ts'o" <tytso@....edu>, sven.utcke@....de,
	Antonio SJ Musumeci <trapexit@...wn.link>,
	Miklos Szeredi <miklos@...redi.hu>,
	Richard Weinberger <richard@....at>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fuse: Add support for fuse stacked I/O

On Jan 14, 2016 11:19 AM, "Linus Torvalds"
<torvalds@...ux-foundation.org> wrote:
>
> On Thu, Jan 14, 2016 at 10:57 AM, Nikhilesh Reddy <reddyn@...eaurora.org> wrote:
> >
> > *I will send out a properly formatted patch shortly.*
>
> So before you do that, can you explain in what cases fuse just wants
> to pass through the IO?
>
> Why aren't such cases just using unionfs or something?
>
> In other words, I think that patch needs an explanation for the
> *reason* for the new functionality.

Also, clarifying the functionality would be nice.  What is the
"underlying" fs you speak of?  What f_cred gets used?  Who opens the
underlying file, whatever that is?

Is the intent overlay-style stacking or is it something else entirely?

--Andy