linux-kernel - Re: [Bcache v13 11/16] bcache: Core btree code

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Message-ID: <20120530074708.GA32121@google.com>
Date:	Wed, 30 May 2012 16:47:08 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, agk@...hat.com
Subject: Re: [Bcache v13 11/16] bcache: Core btree code

A couple more comments from this round of reading.

On Wed, May 09, 2012 at 11:10:48PM -0400, Kent Overstreet wrote:
> +#define btree_prio		USHRT_MAX
> +#define initial_prio		32768

Why are these in lower case?

> +#define PTR_BUCKET(c, k, n)						\
> +	(PTR_CACHE(c, k, n)->buckets + PTR_BUCKET_NR(c, k, n))

PTR_BUCKET(c, k, n)

Awesome.  I don't know what type it takes or what each single
character argument stands for.

> +static inline bool cached_dev_get(struct cached_dev *d)
> +{
> +	if (!atomic_inc_not_zero(&d->count))
> +		return false;
> +
> +	smp_mb__after_atomic_inc();

What is this mb() paired with?  Whenever using a mb, please specify
what the mb is paired with.

> +	return true;
> +}

Thanks.

-- 
tejun
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