linux-kernel - Re: [PATCH] linux/magic.h for magic numbers

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Date:	Tue, 12 Sep 2006 08:30:38 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ian Kent <raven@...maw.net>, akpm@...l.org
CC:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] linux/magic.h for magic numbers

Ian Kent wrote:
> On Sat, 9 Sep 2006, Jeff Garzik wrote:
> 
>> An IRC discussion sparked a memory:  most filesystems really don't
>> need to put anything at all in include/linux.  Excluding API-ish
>> filesystems like procfs, just about the only filesystem symbols that
>> get exported outside of __KERNEL__ are the *_SUPER_MAGIC symbols,
>> and similar symbols.
>>
>> After seeing the useful attributes of linux/poison.h, I propose a
>> similar linux/magic.h.
>>
>> We can see from the patch below that this permitted the deletion of a
>> couple headers, where the *_SUPER_MAGIC symbol was the only thing in the
>> entire header.
>>
>> Other non-filesystem-related magic numbers could get moved here
>> eventually, if maintainers so desire, but I wanted to start off with the
>> obvious low-hanging fruit.
>>
> 
> Would be good to include autofs in this lot.
> 
> Defined in linux/autofs/autofs_i.h
> Defined in linux/autofs4/autofs_i.h
> 
> as 
> 
> #define AUTOFS_SUPER_MAGIC 0x0187

Updated.

Andrew, please add the "magic" branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git

to the list of trees you pull.

Thanks,

	Jeff


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