linux-kernel - Re: [rfc][patch] store-free path walking

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Message-ID: <20091009100249.GD17818@wotan.suse.de>
Date:	Fri, 9 Oct 2009 12:02:49 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	Peter Zijlstra <peterz@...radead.org>, chris.mason@...cle.com
Subject: Re: [rfc][patch] store-free path walking

On Fri, Oct 09, 2009 at 11:51:19AM +0200, Jens Axboe wrote:
> Nick,
> 
> One more thing... I see you converted part of btrfs, but there's still
> this one sitting in btrfs_invalidate_inodes()
> 
>         if (atomic_read(&inode->i_count) > 1)
>                 d_prune_aliases(inode);
> 
> Not sure how best to solve that, with a __d_prune_aliases() that assumed
> the lock was held it would be easy. But perhaps you have better ideas,
> this email is more of a heads-up since perhaps you missed this spot
> (CC'ing Chris).

It's OK, you can load inode->i_count integer atomically -- in this
sequence d_prune_aliases can't have assumed anything about i_count
anyway because regardless of its type it might have changed in
between.

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