linux-kernel - Re: [PATCH 4/4] parse options in the vfs level

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Message-ID: <20110802141806.GL2203@ZenIV.linux.org.uk>
Date:	Tue, 2 Aug 2011 15:18:06 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Hugh Dickins <hughd@...gle.com>,
	Nick Piggin <npiggin@...nel.dk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: Re: [PATCH 4/4] parse options in the vfs level

On Tue, Aug 02, 2011 at 10:04:06AM -0300, Glauber Costa wrote:

> I am not sure either, but I still believe my proposal is superior to
> write-to-a-file specifically. Writing to a file, be it in proc, sys,
> or wherever, leaves a window of opportunity open between mounting a
> filesystem and limiting its caches. Doing it on mount is atomic.
> 
> Effectively, I see this limit as a property of a particular instance
> of a mounted filesystem. Since all properties of a filesystem are
> specified during mount, this becomes a natural extension.

The trouble is, dentry tree is fundamentally a property of superblock.
It's shared between *all* instances of that fs in all mount trees...
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