linux-kernel - Re: [PATCH+comment] fix tmpfs BUG and AOP_WRITEPAGE

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Message-Id: <200710251601.l9PG1Mue019939@agora.fsl.cs.sunysb.edu>
Date:	Thu, 25 Oct 2007 12:01:22 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>, ezk@...sunysb.edu,
	ryan@...nie.org, mhalcrow@...ibm.com, cjwatson@...ntu.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, stable@...nel.org
Subject: Re: [PATCH+comment] fix tmpfs BUG and AOP_WRITEPAGE_ACTIVATE 

In message <Pine.LNX.4.64.0710250705510.9811@...nde.wat.veritas.com>, Hugh Dickins writes:
> On Thu, 25 Oct 2007, Pekka Enberg wrote:

> With unionfs also fixed, we don't know of an absolute need for this
> patch (and so, on that basis, the !wbc->for_reclaim case could indeed
> be removed very soon); but as I see it, the unionfs case has shown
> that it's time to future-proof this code against whatever stacking
> filesystems come along.  Hence I didn't mention the names of such
> filesystems in the source comment.

I think "future proof" for other stackable f/s is a good idea, esp. since
many of the stackable f/s we've developed and distributed over the past 10
years are in some use in various places: gzipfs, avfs, tracefs, replayfs,
ncryptfs, versionfs, wrapfs, i3fs, and more (see www.filesystems.org).

Cheers,
Erez.
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