[PATCH v3 4/4] libmultipath: change log level for null uid_attribute

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If uid_attribute is explicitly set to an empty string, multipath should
log the uid at the default log level, since using the fallback code is
the expected behavior.

Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
---
 libmultipath/discovery.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index d7e8577f..950b1586 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -2084,8 +2084,11 @@ get_uid (struct path * pp, int path_state, struct udev_device *udev,
 			len = strlen(pp->wwid);
 		origin = "callout";
 	} else {
-		bool udev_available = udev && pp->uid_attribute
+		bool valid_uid_attr = pp->uid_attribute
 			&& *pp->uid_attribute;
+		bool empty_uid_attr = pp->uid_attribute
+			&& !*pp->uid_attribute;
+		bool udev_available = udev && valid_uid_attr;
 
 		if (udev_available) {
 			len = get_udev_uid(pp, pp->uid_attribute, udev);
@@ -2095,7 +2098,8 @@ get_uid (struct path * pp, int path_state, struct udev_device *udev,
 		}
 		if ((!udev_available || (len <= 0 && allow_fallback))
 		    && has_uid_fallback(pp)) {
-			used_fallback = 1;
+			if (!udev || !empty_uid_attr)
+				used_fallback = 1;
 			len = uid_fallback(pp, path_state, &origin);
 		}
 	}
-- 
2.17.2

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