linux-kernel - Re: [PATCH 1/4] autofs4 - cleanup autofs mount type usage

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Date:	Sat, 09 Aug 2008 23:17:18 +0800
From:	Ian Kent <raven@...maw.net>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	autofs mailing list <autofs@...ux.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 1/4] autofs4 - cleanup autofs mount type usage

On Sat, 2008-08-09 at 08:47 -0400, Christoph Hellwig wrote:
> On Thu, Aug 07, 2008 at 07:40:06PM +0800, Ian Kent wrote:
> > Usage of the AUTOFS_TYPE_* defines is a little confusing and
> > appears inconsistent.
> 
> Not enough of an explanation for this patch.

OK, I'll re-submit this with an updated description.

> 
> It does:
> 
>  - move AUTOFS_TYPE_INDIRECT/AUTOFS_TYPE_DIRECT/AUTOFS_TYPE_OFFSET
>    to include/linux/auto_fs4.h.  Obviously okay but should mentioned
>    in the changelog.

So that user space can use consistent definitions.

>  - add a new, unused AUTOFS_TYPE_ANY constant. Why?

It is used by the later ioctl implementation patch.

>  - add a new AUTOFS_TYPE_TRIGGER and use it instead of
>    AUTOFS_TYPE_DIRECT or in one single case
>    (AUTOFS_TYPE_DIRECT|AUTOFS_TYPE_OFFSET).  Definitively needs a good
>    explanation.

The direct and offset autofs mount types are, to a large extent, treated
the same way in the kernel module but are used a little differently in
user space. Previously, an offset mount had it's type set to
AUTOFS_TYPE_DIRECT|AUTOFS_TYPE_OFFSET but, the subsequent ioctl
implementation patch needs to be able to identify all three types of
autofs mount distinctly.

>  - replaces one use of sbi->type = 0 with AUTOFS_TYPE_INDIRECT (0x0001).
>    Why?

Previously, a type of 0 was implicitly assumed to be type
AUTOFS_TYPE_INDIRECT but that was not clear and doesn't lend itself to
clearly defined logic when trying to locate a specific type of autofs
mount in the later patch in the series.

Ian

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