linux-kernel - Re: [PATCH v5 1/5] lightnvm: Support for Open-Channel SSDs

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Message-ID: <20150723095329.GA26420@infradead.org>
Date:	Thu, 23 Jul 2015 02:53:29 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Matias Bj??rling <mb@...htnvm.io>
Cc:	hch@...radead.org, axboe@...com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	Stephen.Bates@...s.com, keith.busch@...el.com
Subject: Re: [PATCH v5 1/5] lightnvm: Support for Open-Channel SSDs

Hi Matias,

I like this new architecture.

Minor nitpicks below:

> @@ -0,0 +1,598 @@
> +/*
> + * core.c - Open-channel SSD integration core

No need to state the file name in the top of the file comments, it
doesn't add value and get stale easily.

> +static LIST_HEAD(_targets);
> +static LIST_HEAD(_bms);
> +static LIST_HEAD(_devices);
> +static DECLARE_RWSEM(_lock);

Please add a nvm_ prefix to these.

> +static int nvm_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
> +							unsigned long arg)
> +{
> +	return 0;
> +}
> +
> +static int nvm_open(struct block_device *bdev, fmode_t mode)
> +{
> +	return 0;
> +}
> +
> +static void nvm_release(struct gendisk *disk, fmode_t mode)
> +{
> +}


No need to implement these empty methods.

> +/* _lock must be taken */

Turn this into an lockdep_assert_held in the code, please.

> +int nvm_register(struct request_queue *q, struct gendisk *disk,
> +							struct nvm_dev_ops *ops)
> +{

No need to pass a gendisk here, in fact LighNVM low level driver
shouldn't even need to allocate one.  The only thing you seem to be
using here is the name anyway.

> +void nvm_unregister(struct gendisk *disk)

Same here.
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