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

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Message-ID: <20120321222812.GS6589@ZenIV.linux.org.uk>
Date:	Wed, 21 Mar 2012 22:28:12 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Evgeniy Polyakov <zbr@...emap.net>
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 Thu, Mar 22, 2012 at 02:04:15AM +0400, Evgeniy Polyakov wrote:

> Details are pretty simple - we want to allow external applications to
> get to filesystem and grab data via single requests, since it is
> stateless and can not hold dentry structure. They do not connect to
> server which runs on top of filesystem, but insted directly to storage,
> which hosts raw data.
> 
> Applications know they uploadede data via /whatever/path/was/to/the/file
> And they want to get that data from server via single 'get'. Obviously
> they can not store mapping from all filenames to inode number, and they
> can not request dozen of directory lookups, since it takes time and has
> to maintain state.

Sigh... I wish it hadn't been an English-speaking maillist; mat is hard to
translate properly...

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?

> 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...
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