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Commit e272afec authored by Stephen M. Cameron's avatar Stephen M. Cameron Committed by Jens Axboe
Browse files

cciss: Add usage_count attribute to each logical drive in /sys 



Add usage_count attribute to each logical drive at
/sys/devices/<dev>/ccissX/cXdY/usage_count for controller X,
logical drive Y.  The usage count is the number of times
the device has currently been opened.

Signed-off-by: default avatarStephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent 3ff1111d

Documentation/ABI/testing/sysfs-bus-pci-devices-cciss

+7 −0
Original line number Diff line number Diff line
@@ -52,3 +52,10 @@ Kernel Version: 2.6.31 
Contact:	iss_storagedev@hp.com

Description:	Displays the RAID level of logical drive Y of

		controller X.



Where:		/sys/bus/pci/devices/<dev>/ccissX/cXdY/usage_count

Date:		August 2009

Kernel Version: 2.6.31

Contact:	iss_storagedev@hp.com

Description:	Displays the usage count (number of opens) of logical drive Y

		of controller X.

drivers/block/cciss.c

+20 −0
Original line number Diff line number Diff line
@@ -626,6 +626,25 @@ static ssize_t cciss_show_raid_level(struct device *dev, 
}

DEVICE_ATTR(raid_level, S_IRUGO, cciss_show_raid_level, NULL);



static ssize_t cciss_show_usage_count(struct device *dev,

				      struct device_attribute *attr, char *buf)

{

	drive_info_struct *drv = dev_get_drvdata(dev);

	struct ctlr_info *h = to_hba(drv->dev->parent);

	unsigned long flags;

	int count;



	spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);

	if (h->busy_configuring) {

		spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);

		return -EBUSY;

	}

	count = drv->usage_count;

	spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);

	return snprintf(buf, 20, "%d\n", count);

}

DEVICE_ATTR(usage_count, S_IRUGO, cciss_show_usage_count, NULL);



static struct attribute *cciss_host_attrs[] = {

	&dev_attr_rescan.attr,

	NULL
@@ -653,6 +672,7 @@ static struct attribute *cciss_dev_attrs[] = { 
	&dev_attr_rev.attr,

	&dev_attr_lunid.attr,

	&dev_attr_raid_level.attr,

	&dev_attr_usage_count.attr,

	NULL

};