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

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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: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Stephen M. Cameron 2009-09-17 13:48:26 -05:00 committed by Jens Axboe
parent 3ff1111dc6
commit e272afecaf
2 changed files with 27 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-bus-pci-devices-cciss
View File

@ -52,3 +52,10 @@ Kernel Version: 2.6.31
Contact: iss_storagedev@hp.com Contact: iss_storagedev@hp.com
Description: Displays the RAID level of logical drive Y of Description: Displays the RAID level of logical drive Y of
controller X. 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.

20
drivers/block/cciss.c
View File

@ -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); 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[] = { static struct attribute *cciss_host_attrs[] = {
&dev_attr_rescan.attr, &dev_attr_rescan.attr,
NULL NULL
@ -653,6 +672,7 @@ static struct attribute *cciss_dev_attrs[] = {
&dev_attr_rev.attr, &dev_attr_rev.attr,
&dev_attr_lunid.attr, &dev_attr_lunid.attr,
&dev_attr_raid_level.attr, &dev_attr_raid_level.attr,
&dev_attr_usage_count.attr,
NULL NULL
}; };