ovl: add flag for upper in ovl_entry

For rename, we need to ensure that an upper alias exists for hard links
before attempting the operation.  Introduce a flag in ovl_entry to track
the state of the upper alias.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index 9642ec64467b..878a750986dd 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -42,7 +42,10 @@ struct ovl_fs {
 /* private information held for every overlayfs dentry */
 struct ovl_entry {
 	union {
-		bool opaque;
+		struct {
+			unsigned long has_upper;
+			bool opaque;
+		};
 		struct rcu_head rcu;
 	};
 	unsigned numlower;