Commit 41f95dd2 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Martin K. Petersen
Browse files

scsi_dh: move 'dh_state' sysfs attribute to generic code 



As scsi_dh.c is now always compiled in we should be moving
the 'dh_state' attribute to the generic code.

Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.com>
Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 7789cd39

drivers/scsi/scsi_dh.c

+1 −71
Original line number Diff line number Diff line
@@ -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)
@@ -238,11 +173,6 @@ void scsi_dh_release_device(struct scsi_device *sdev) 
		scsi_dh_handler_detach(sdev);

}



void scsi_dh_remove_device(struct scsi_device *sdev)

{

	device_remove_file(&sdev->sdev_gendev, &scsi_dh_state_attr);

}



/*

 * scsi_register_device_handler - register a device handler personality

 *      module.

drivers/scsi/scsi_priv.h

+1 −2
Original line number Diff line number Diff line
@@ -174,12 +174,11 @@ extern struct async_domain scsi_sd_probe_domain; 
#ifdef CONFIG_SCSI_DH

int scsi_dh_add_device(struct scsi_device *sdev);

void scsi_dh_release_device(struct scsi_device *sdev);

void scsi_dh_remove_device(struct scsi_device *sdev);

#else

static inline int scsi_dh_add_device(struct scsi_device *sdev) { return 0; }

static inline void scsi_dh_release_device(struct scsi_device *sdev) { }

static inline void scsi_dh_remove_device(struct scsi_device *sdev) { }

#endif

static inline void scsi_dh_remove_device(struct scsi_device *sdev) { }



/* 

 * internal scsi timeout functions: for use by mid-layer and transport

drivers/scsi/scsi_sysfs.c

+58 −0
Original line number Diff line number Diff line
@@ -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>
@@ -904,6 +905,60 @@ 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,
@@ -973,6 +1028,9 @@ 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),

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