diff options
| author | Stephen M. Cameron <scameron@beardog.cce.hp.com> | 2009-09-17 13:48:26 -0500 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-10-01 21:15:44 +0200 |
| commit | e272afecaf18912e971374df4605496975942e5c (patch) | |
| tree | e3dbdedb51da5a48acf50b186ed12b43a614368c /drivers/block/cciss.c | |
| parent | 3ff1111dc6e27524eeef267ab0ca9b5690594748 (diff) | |
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: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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 063e8b0834d..b808e9287b7 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 }; |