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

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Date:	Thu, 25 Oct 2007 13:51:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Erez Zadok <ezk@...sunysb.edu>
CC:	Hugh Dickins <hugh@...itas.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>, 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

Erez Zadok wrote:
> 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).
> 

A number of filesystems want partial or full stackability, so getting 
rid of lack-of-stackability whereever it may be is highly valuable.

	-hpa

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