Use scsi_vpd_lun_id() to export the world-wide unique id (wwid) to sysfs.
Note that this is the 'best' wwid according to the rules in
scsi_vpd_lun_id(), not every possible wwid presented by the drive.
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/scsi_sysfs.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index d015374..ef36053 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -905,6 +905,22 @@ sdev_show_function(queue_depth, "%d\n");
static DEVICE_ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
sdev_store_queue_depth);
+static ssize_t
+sdev_show_wwid(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ ssize_t count;
+
+ count = scsi_vpd_lun_id(sdev, buf, PAGE_SIZE);
+ if (count > 0) {
+ buf[count] = '\n';
+ count++;
+ }
+ return count;
+}
+static DEVICE_ATTR(wwid, S_IRUGO, sdev_show_wwid, NULL);
+
#ifdef CONFIG_SCSI_DH
static ssize_t
sdev_show_dh_state(struct device *dev, struct device_attribute *attr,
@@ -1028,6 +1044,7 @@ static struct attribute *scsi_sdev_attrs[] = {
&dev_attr_modalias.attr,
&dev_attr_queue_depth.attr,
&dev_attr_queue_type.attr,
+ &dev_attr_wwid.attr,
#ifdef CONFIG_SCSI_DH
&dev_attr_dh_state.attr,
#endif
--
1.8.5.6
--
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