nvme: also provide a UUID in the WWID sysfs attribute

The WWID sysfs attribute can provide multiple means of a World Wide ID
for a NVMe device. It can either be a NGUID, a EUI-64 or a concatenation
of VID, Serial Number, Model and the Namespace ID in this order of
preference.

If the target also sends us a UUID use the UUID for identification and
give it the highest priority.

This eases generation of /dev/disk/by-* symlinks.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3b77cfe5aa1eb2250b6f60d4a596840a57473a03..4cacab331f2ac7c92a0796090e7451ce7a66bd3f 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1995,6 +1995,9 @@ static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
        int serial_len = sizeof(ctrl->serial);
        int model_len = sizeof(ctrl->model);
 
+       if (!uuid_is_null(&ns->uuid))
+               return sprintf(buf, "uuid.%pU\n", &ns->uuid);
+
        if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
                return sprintf(buf, "eui.%16phN\n", ns->nguid);