linux-kernel - Re: [PATCH 0/4] IMA: making i_readcount a first class inode citizen

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Message-ID: <20101028222404.GG2715@dastard>
Date:	Fri, 29 Oct 2010 09:24:04 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org,
	warthog9@...nel.org, jmorris@...ei.org, kyle@...artin.ca,
	hpa@...or.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, mingo@...e.hu, eparis@...hat.com,
	viro@...iv.linux.org.uk, Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH 0/4] IMA: making i_readcount a first class inode citizen

On Thu, Oct 28, 2010 at 06:02:01PM -0400, Mimi Zohar wrote:
> On Mon, 2010-10-25 at 14:41 -0400, Eric Paris wrote:
> 
> <snip>
> 
> > I believe that IBM is going to look into making i_readcount a first
> > class citizen which can be used by both IMA and generic_setlease().
> > Then people could say IMA had 0 per inode overhead   :)
> 
> This patchset separates the incrementing/decrementing of the i_readcount,
> in the VFS layer, from other IMA functionality, by replacing the current
> ima_counts_get() call with iget_readcount(). Its unclear whether this
> call to increment i_readcount should be made earlier. 

Why the wrapper functions and locking? Why not an atomic variable like
i_writecount?

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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