discover/udev: Use UUIDs for multipath check

Partitions will share a serial number.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

diff --git a/discover/udev.c b/discover/udev.c
index 80029d6820d225f001940d696ec3c67c63ced878..305df95f4f4dd71f0783eb0755a76cc298a212f9 100644 (file)
--- a/discover/udev.c
+++ b/discover/udev.c
@@ -62,7 +62,7 @@ static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
 {
        struct discover_device *ddev;
        const char *typestr;
-       const char *serial;
+       const char *uuid;
        const char *path;
        const char *name;
        const char *node;
@@ -112,19 +112,24 @@ static int udev_handle_dev_add(struct pb_udev *udev, struct udev_device *dev)
                return -1;
        }
 
-       /* we may also see multipath devices; same dev nodes (hence id), but
-        * different serial numbers */
-       serial = udev_device_get_property_value(dev, "ID_SERIAL");
-       if (serial && device_lookup_by_serial(udev->handler, serial))
-               return -1;
+       /* We may see multipath devices; they'll have the same uuid as an
+        * existing device, so only parse the first. */
+       uuid = udev_device_get_property_value(dev, "ID_FS_UUID");
+       if (uuid) {
+               ddev = device_lookup_by_uuid(udev->handler, uuid);
+               if (ddev) {
+                       pb_log("SKIP: %s UUID [%s] already present (as %s)\n",
+                                       name, uuid, ddev->device->id);
+                       return -1;
+               }
+       }
 
        ddev = discover_device_create(udev->handler, name);
 
        ddev->device_path = talloc_strdup(ddev, node);
 
-       prop = udev_device_get_property_value(dev, "ID_FS_UUID");
-       if (prop)
-               ddev->uuid = talloc_strdup(ddev, prop);
+       if (uuid)
+               ddev->uuid = talloc_strdup(ddev, uuid);
        prop = udev_device_get_property_value(dev, "ID_FS_LABEL");
        if (prop)
                ddev->label = talloc_strdup(ddev, prop);