linux-kernel - Re: [take 3] pohmelfs: call for inclusion

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Message-ID: <20120321224001.GB23336@ioremap.net>
Date:	Thu, 22 Mar 2012 02:40:02 +0400
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>, greg@...ah.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [take 3] pohmelfs: call for inclusion

On Wed, Mar 21, 2012 at 10:28:12PM +0000, Al Viro (viro@...IV.linux.org.uk) wrote:
> Sigh... I wish it hadn't been an English-speaking maillist; mat is hard to
> translate properly...

Argh, undecency is pretty useful /most of the time/frequently/

> OK, let me try for a printable version: suppose we replace that d_path()
> call with dentry_path() and leave everything else as is; what exactly
> will be broken and how will it break?

I didn't understand you at first. Replacing it with dentry_path() will
not break anything. It was not supposed fs should care about chroot for
this case - every application (including chrooted) writes into own
namespace, so if it changes root, it is on its own...

> > When object was written via remounted path, then it is a problem for
> > those who made a setup - this ugly hack only 'works' in specially
> > crafted environment, which provides its pros and requires fair price of
> > cons.
> 
> _What_ remounted path?  I'm not talking about bindings at all...

I believe you will?

Actually if this useful hack is so much a PITA I will drop it. Or fix
with dentry_path() instead. It doesn't really deserve _that_ much.

-- 
	Evgeniy Polyakov
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