linux-kernel - Re: [PATCH 03/28] unlink: monitor i

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Date:	Thu, 3 Aug 2006 15:35:49 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, viro@....linux.org.uk,
	herbert@...hfloor.at, hch@...radead.org
Subject: Re: [PATCH 03/28] unlink: monitor i_nlink

On Tue, Aug 01, 2006 at 04:52:42PM -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.

Looks good.  I wonder if we could find a better name for it.  Maybe just
dec_nlink?  And add a simple counterpart

static inline void inc_nlink(struct inode *inode)
{
	inode->i_nlink++;
}

for symmetry reasons.  After that the patch can go off to Andrew before
the series aswell.

> Should
> we also be checking all of the places where i_nlink is explicitly
> set to 0 in the unlink paths?

They'll definitly need some auditing.
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