From: Tomas Henzl <thenzl@redhat.com> Date: Sun, 29 Aug 2010 15:49:29 -0400 Subject: [block] cciss: add usage_count attribute to logical drive Message-id: <1283097002-3341-31-git-send-email-thenzl@redhat.com> Patchwork-id: 27886 O-Subject: [RHEL6 PATCH 30/63] cciss: Add usage_count attribute to logical drives in /sys Bugzilla: 568830 RH-Acked-by: Neil Horman <nhorman@redhat.com> Add usage_count attribute to logical drives in /sys diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index e2c9e32..67dba64 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -627,6 +627,25 @@ static ssize_t cciss_show_raid_level(struct device *dev, } DEVICE_ATTR(raid_level, S_IRUGO | S_IWUSR, 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); + struct device_attribute *cciss_dev_attrs[] = { &dev_attr_unique_id, &dev_attr_vendor, @@ -634,6 +653,7 @@ struct device_attribute *cciss_dev_attrs[] = { &dev_attr_rev, &dev_attr_lunid, &dev_attr_raid_level, + &dev_attr_usage_count, NULL, };