Re: [PATCH 01/18] scsi_dh: move 'dh_state' sysfs attribute to generic code

[Johannes Thumshirn <jthumshirn@suse.com>]

On Mon, 2015-11-09 at 16:08 +0100, Hannes Reinecke wrote:
> As scsi_dh.c is now always compiled in we should be moving
> the 'dh_state' attribute to the generic code.
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> ---
>  drivers/scsi/scsi_dh.c    | 68 +----------------------------------
> ------------
>  drivers/scsi/scsi_sysfs.c | 58
> ++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
> index 0a2168e..57ad0f3 100644
> --- a/drivers/scsi/scsi_dh.c
> +++ b/drivers/scsi/scsi_dh.c
> @@ -153,76 +153,11 @@ static void scsi_dh_handler_detach(struct
> scsi_device *sdev)
>  	module_put(sdev->handler->module);
>  }
>  
> -/*
> - * Functions for sysfs attribute 'dh_state'
> - */
> -static ssize_t
> -store_dh_state(struct device *dev, struct device_attribute *attr,
> -	       const char *buf, size_t count)
> -{
> -	struct scsi_device *sdev = to_scsi_device(dev);
> -	struct scsi_device_handler *scsi_dh;
> -	int err = -EINVAL;
> -
> -	if (sdev->sdev_state == SDEV_CANCEL ||
> -	    sdev->sdev_state == SDEV_DEL)
> -		return -ENODEV;
> -
> -	if (!sdev->handler) {
> -		/*
> -		 * Attach to a device handler
> -		 */
> -		scsi_dh = scsi_dh_lookup(buf);
> -		if (!scsi_dh)
> -			return err;
> -		err = scsi_dh_handler_attach(sdev, scsi_dh);
> -	} else {
> -		if (!strncmp(buf, "detach", 6)) {
> -			/*
> -			 * Detach from a device handler
> -			 */
> -			sdev_printk(KERN_WARNING, sdev,
> -				    "can't detach handler %s.\n",
> -				    sdev->handler->name);
> -			err = -EINVAL;
> -		} else if (!strncmp(buf, "activate", 8)) {
> -			/*
> -			 * Activate a device handler
> -			 */
> -			if (sdev->handler->activate)
> -				err = sdev->handler->activate(sdev,
> NULL, NULL);
> -			else
> -				err = 0;
> -		}
> -	}
> -
> -	return err<0?err:count;
> -}
> -
> -static ssize_t
> -show_dh_state(struct device *dev, struct device_attribute *attr,
> char *buf)
> -{
> -	struct scsi_device *sdev = to_scsi_device(dev);
> -
> -	if (!sdev->handler)
> -		return snprintf(buf, 20, "detached\n");
> -
> -	return snprintf(buf, 20, "%s\n", sdev->handler->name);
> -}
> -
> -static struct device_attribute scsi_dh_state_attr =
> -	__ATTR(dh_state, S_IRUGO | S_IWUSR, show_dh_state,
> -	       store_dh_state);
> -
>  int scsi_dh_add_device(struct scsi_device *sdev)
>  {
>  	struct scsi_device_handler *devinfo = NULL;
>  	const char *drv;
> -	int err;
> -
> -	err = device_create_file(&sdev->sdev_gendev,
> &scsi_dh_state_attr);
> -	if (err)
> -		return err;
> +	int err = 0;
>  
>  	drv = scsi_dh_find_driver(sdev);
>  	if (drv)
> @@ -236,7 +171,6 @@ void scsi_dh_remove_device(struct scsi_device
> *sdev)
>  {
>  	if (sdev->handler)
>  		scsi_dh_handler_detach(sdev);
> -	device_remove_file(&sdev->sdev_gendev, &scsi_dh_state_attr);
>  }
>  
>  /*
> diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> index f021423..13a5ede 100644
> --- a/drivers/scsi/scsi_sysfs.c
> +++ b/drivers/scsi/scsi_sysfs.c
> @@ -17,6 +17,7 @@
>  #include <scsi/scsi_device.h>
>  #include <scsi/scsi_host.h>
>  #include <scsi/scsi_tcq.h>
> +#include <scsi/scsi_dh.h>
>  #include <scsi/scsi_transport.h>
>  #include <scsi/scsi_driver.h>
>  
> @@ -902,6 +903,60 @@ sdev_show_function(queue_depth, "%d\n");
>  static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR,
> sdev_show_queue_depth,
>  		   sdev_store_queue_depth);
>  
> +#ifdef CONFIG_SCSI_DH
> +static ssize_t
> +sdev_show_dh_state(struct device *dev, struct device_attribute
> *attr,
> +		   char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +
> +	if (!sdev->handler)
> +		return snprintf(buf, 20, "detached\n");
> +
> +	return snprintf(buf, 20, "%s\n", sdev->handler->name);
> +}
> +
> +static ssize_t
> +sdev_store_dh_state(struct device *dev, struct device_attribute
> *attr,
> +		    const char *buf, size_t count)
> +{
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +	int err = -EINVAL;
> +
> +	if (sdev->sdev_state == SDEV_CANCEL ||
> +	    sdev->sdev_state == SDEV_DEL)
> +		return -ENODEV;
> +
> +	if (!sdev->handler) {
> +		/*
> +		 * Attach to a device handler
> +		 */
> +		err = scsi_dh_attach(sdev->request_queue, buf);
> +	} else if (!strncmp(buf, "activate", 8)) {
> +		/*
> +		 * Activate a device handler
> +		 */
> +		if (sdev->handler->activate)
> +			err = sdev->handler->activate(sdev, NULL,
> NULL);
> +		else
> +			err = 0;
> +	} else if (!strncmp(buf, "detach", 6)) {
> +		/*
> +		 * Detach from a device handler
> +		 */
> +		sdev_printk(KERN_WARNING, sdev,
> +			    "can't detach handler %s.\n",
> +			    sdev->handler->name);
> +		err = -EINVAL;
> +	}
> +
> +	return err < 0 ? err : count;
> +}
> +
> +static DEVICE_ATTR(dh_state, S_IRUGO | S_IWUSR, sdev_show_dh_state,
> +		   sdev_store_dh_state);
> +#endif
> +
>  static ssize_t
>  sdev_show_queue_ramp_up_period(struct device *dev,
>  			       struct device_attribute *attr,
> @@ -971,6 +1026,9 @@ static struct attribute *scsi_sdev_attrs[] = {
>  	&dev_attr_modalias.attr,
>  	&dev_attr_queue_depth.attr,
>  	&dev_attr_queue_type.attr,
> +#ifdef CONFIG_SCSI_DH
> +	&dev_attr_dh_state.attr,
> +#endif
>  	&dev_attr_queue_ramp_up_period.attr,
>  	REF_EVT(media_change),
>  	REF_EVT(inquiry_change_reported),

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
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