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

[Nick Piggin <npiggin@suse.de>]

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.