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Date: Mon, 14 Apr 2008 05:08:02 -0400
From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Xavier Bestel <xavier.bestel@free.fr>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       David Woodhouse <dwmw2@infradead.org>,
       Miklos Szeredi <miklos@szeredi.hu>, hch@infradead.org,
       me@bobcopeland.com, linux-kernel@vger.kernel.org,
       linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0/7] OMFS filesystem version 3
Message-ID: <20080414090801.GC15541@infradead.org>
References: <20080413080130.GA9622@infradead.org> <20080413012001.8d7967f4.akpm@linux-foundation.org> <20080413082815.GA20108@infradead.org> <E1JkzaV-0003Lm-NB@pomaz-ex.szeredi.hu> <1208121358.2700.4.camel@shinybook.infradead.org> <20080413154459.4b2f125d.akpm@linux-foundation.org> <20080413234920.63711ca7@core> <20080413161014.cb06964c.akpm@linux-foundation.org> <1208161859.3596.75.camel@skunk.anacadf.mentorg.com> <20080414014445.5b4a7b22.akpm@linux-foundation.org>
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On Mon, Apr 14, 2008 at 01:44:45AM -0700, Andrew Morton wrote:
> By "cost" I refer to extra developer time spent on maintaining the
> filesystem.  The most recent example is the write_begin/write_end changes
> which took a lot of Nick's time and rather a lot of mine also.

Which are only an extra cost for complex filesystem.  Trivial block
filesystems like omfs just use the generic callbacks and can be
converted in a simple sweep.