linux-kernel - Re: [PATCH] BLOCK: Make it possible to disable the block layer

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Date:	Thu, 24 Aug 2006 14:13:13 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Jens Axboe <axboe@...e.de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] BLOCK: Make it possible to disable the block layer

On Thu, 2006-08-24 at 14:00 +0100, David Howells wrote:
> Make it possible to disable the block layer.  Not all embedded devices require
> it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require
> the block layer to be present.
> 
> This patch does the following:
> 
>  (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev
>      support.

Excellent -- I've been meaning to do this (and occasionally hacking on
it half-heartedly before getting distracted by something else shiny) for
a _long_ time.

It looks good in general.

>  (*) The contents of a number of filesystem- and blockdev-specific header files
>      are now contingent on their own configuration options.  This includes:
>      Ext3/JBD, RAID, MSDOS and ReiserFS.

Why? Those header files shouldn't be included from anywhere _but_ the
code in question, and in fact should probably be just moved into fs/foo
instead of living in include/linux/foo_fs.h. 

And please, _never_ make anything dependent on CONFIG_foo_MODULE.

-- 
dwmw2

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