From: Ilya Dryomov <idryomov@gmail.com>
Date: Wed, 13 Apr 2016 12:15:50 +0000 (+0200)
Subject: rbd: report unsupported features to syslog
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d3767f0faeda5abdf205f947ae912d48dc70fa06;p=openwrt%2Fstaging%2Fblogic.git

rbd: report unsupported features to syslog

... instead of just returning an error.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>
---

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 25d22da47f6e..0ede6d7e2568 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4183,7 +4183,7 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
 		__le64 features;
 		__le64 incompat;
 	} __attribute__ ((packed)) features_buf = { 0 };
-	u64 incompat;
+	u64 unsup;
 	int ret;
 
 	ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name,
@@ -4196,9 +4196,12 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
 	if (ret < sizeof (features_buf))
 		return -ERANGE;
 
-	incompat = le64_to_cpu(features_buf.incompat);
-	if (incompat & ~RBD_FEATURES_SUPPORTED)
+	unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED;
+	if (unsup) {
+		rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx",
+			 unsup);
 		return -ENXIO;
+	}
 
 	*snap_features = le64_to_cpu(features_buf.features);