linux-kernel - Re: [PATCH 2/7] cbd: introduce cbd

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Date: Wed, 24 Apr 2024 04:08:49 +0000
From: Chaitanya Kulkarni <chaitanyak@...dia.com>
To: Dongsheng Yang <dongsheng.yang@...ystack.cn>, "dan.j.williams@...el.com"
	<dan.j.williams@...el.com>, "axboe@...nel.dk" <axboe@...nel.dk>
CC: "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>, Dongsheng Yang
	<dongsheng.yang.linux@...il.com>
Subject: Re: [PATCH 2/7] cbd: introduce cbd_transport

> +static ssize_t cbd_myhost_show(struct device *dev,
> +			       struct device_attribute *attr,
> +			       char *buf)
> +{
> +	struct cbd_transport *cbdt;
> +	struct cbd_host *host;
> +
> +	cbdt = container_of(dev, struct cbd_transport, device);
> +
> +	host = cbdt->host;
> +	if (!host)
> +		return 0;
> +
> +	return sprintf(buf, "%d\n", host->host_id);

snprintf() ?

> +}
> +
> +static DEVICE_ATTR(my_host_id, 0400, cbd_myhost_show, NULL);
> +
> +enum {

[...]

> +
> +static ssize_t cbd_adm_store(struct device *dev,
> +				 struct device_attribute *attr,
> +				 const char *ubuf,
> +				 size_t size)
> +{
> +	int ret;
> +	char *buf;
> +	struct cbd_adm_options opts = { 0 };
> +	struct cbd_transport *cbdt;
> +

reverse tree order that matches rest of your code ?

> +	if (!capable(CAP_SYS_ADMIN))
> +		return -EPERM;
> +
> +	cbdt = container_of(dev, struct cbd_transport, device);
> +
> +	buf = kmemdup(ubuf, size + 1, GFP_KERNEL);
> +	if (IS_ERR(buf)) {
> +		pr_err("failed to dup buf for adm option: %d", (int)PTR_ERR(buf));
> +		return PTR_ERR(buf);
> +	}
> +	buf[size] = '\0';
> +	ret = parse_adm_options(cbdt, buf, &opts);
> +	if (ret < 0) {
> +		kfree(buf);
> +		return ret;
> +	}
> +	kfree(buf);
> +

standard format is using goto out and having only on kfree()
at the end of the function ...

> +	switch (opts.op) {
> +	case CBDT_ADM_OP_B_START:
> +		break;
> +	case CBDT_ADM_OP_B_STOP:
> +		break;
> +	case CBDT_ADM_OP_B_CLEAR:
> +		break;
> +	case CBDT_ADM_OP_DEV_START:
> +		break;
> +	case CBDT_ADM_OP_DEV_STOP:
> +		break;
> +	default:
> +		pr_err("invalid op: %d\n", opts.op);
> +		return -EINVAL;
> +	}
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return size;
> +}
> +

[...]

> +static struct cbd_transport *cbdt_alloc(void)
> +{
> +	struct cbd_transport *cbdt;
> +	int ret;
> +
> +	cbdt = kzalloc(sizeof(struct cbd_transport), GFP_KERNEL);
> +	if (!cbdt) {
> +		return NULL;
> +	}

no braces needed for single statements in if ... applies rest of
the code ...

-ck