diff options
Diffstat (limited to 'drivers/block/cciss.c')
| -rw-r--r-- | drivers/block/cciss.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 063e8b0834da..b808e9287b73 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -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 }; |