linux-kernel - Re: [PATCH 3/6] unlink: monitor i

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Message-ID: <20060809171109.GC7324@infradead.org>
Date:	Wed, 9 Aug 2006 18:11:09 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 3/6] unlink: monitor i_nlink

On Wed, Aug 09, 2006 at 09:57:32AM -0700, Dave Hansen wrote:
> 
> When a filesystem decrements i_nlink to zero, it means that a
> write must be performed in order to drop the inode from the
> filesystem.
> 
> We're shortly going to have keep filesystems from being remounted
> r/o between the time that this i_nlink decrement and that write
> occurs.  
> 
> So, add a little helper function to do the decrements.  We'll
> tie into it in a bit to note when i_nlink hits zero.
> 
> Signed-off-by: Dave Hansen <haveblue@...ibm.com>

Acked-by: Christoph Hellwig <hch@....de>

Note that we all (and especially Andrew :)) need to be carefull not to
introduce unguarded i_nlink decrements again.  Dave, you'll probably need
to do another audit when you introduce the real functionality.
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