linux-kernel - Re: [PATCH 11/16] libnvdimm: Simplify root read-only definition for the 'resource' attribute

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Date:   Tue, 12 Nov 2019 17:20:26 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     peterz@...radead.org, dave.hansen@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 11/16] libnvdimm: Simplify root read-only definition for the 'resource' attribute

Dan Williams <dan.j.williams@...el.com> writes:

> Rather than update the permission in ->is_visible() set the permission
> directly at declaration time.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
>  drivers/nvdimm/namespace_devs.c |    9 +++------
>  drivers/nvdimm/pfn_devs.c       |   10 +---------
>  drivers/nvdimm/region_devs.c    |   10 +++-------
>  3 files changed, 7 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 37471a272c1a..85b553094d19 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -1303,7 +1303,7 @@ static ssize_t resource_show(struct device *dev,
>  		return -ENXIO;
>  	return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
>  }
> -static DEVICE_ATTR_RO(resource);
> +static DEVICE_ATTR(resource, 0400, resource_show, NULL);
>  
>  static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
>  	4096, 4104, 4160, 4224, 0 };
> @@ -1619,11 +1619,8 @@ static umode_t namespace_visible(struct kobject *kobj,
>  {
>  	struct device *dev = container_of(kobj, struct device, kobj);
>  
> -	if (a == &dev_attr_resource.attr) {
> -		if (is_namespace_blk(dev))
> -			return 0;
> -		return 0400;
> -	}
> +	if (a == &dev_attr_resource.attr && is_namespace_blk(dev))
> +		return 0;
>  
>  	if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
>  		if (a == &dev_attr_size.attr)
> diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
> index e809961e2b6f..9f9cb51301e7 100644
> --- a/drivers/nvdimm/pfn_devs.c
> +++ b/drivers/nvdimm/pfn_devs.c
> @@ -218,7 +218,7 @@ static ssize_t resource_show(struct device *dev,
>  
>  	return rc;
>  }
> -static DEVICE_ATTR_RO(resource);
> +static DEVICE_ATTR(resource, 0400, resource_show, NULL);
>  
>  static ssize_t size_show(struct device *dev,
>  		struct device_attribute *attr, char *buf)
> @@ -269,16 +269,8 @@ static struct attribute *nd_pfn_attributes[] = {
>  	NULL,
>  };
>  
> -static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n)
> -{
> -	if (a == &dev_attr_resource.attr)
> -		return 0400;
> -	return a->mode;
> -}
> -
>  static struct attribute_group nd_pfn_attribute_group = {
>  	.attrs = nd_pfn_attributes,
> -	.is_visible = pfn_visible,
>  };
>  
>  const struct attribute_group *nd_pfn_attribute_groups[] = {
> diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> index 0afc1973e938..be3e429e86af 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -553,7 +553,7 @@ static ssize_t resource_show(struct device *dev,
>  
>  	return sprintf(buf, "%#llx\n", nd_region->ndr_start);
>  }
> -static DEVICE_ATTR_RO(resource);
> +static DEVICE_ATTR(resource, 0400, resource_show, NULL);
>  
>  static ssize_t persistence_domain_show(struct device *dev,
>  		struct device_attribute *attr, char *buf)
> @@ -605,12 +605,8 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
>  	if (!is_memory(dev) && a == &dev_attr_badblocks.attr)
>  		return 0;
>  
> -	if (a == &dev_attr_resource.attr) {
> -		if (is_memory(dev))
> -			return 0400;
> -		else
> -			return 0;
> -	}
> +	if (a == &dev_attr_resource.attr && !is_memory(dev))
> +		return 0;
>  
>  	if (a == &dev_attr_deep_flush.attr) {
>  		int has_flush = nvdimm_has_flush(nd_region);
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