vfs: add d_real_inode() helper

commit a118084432d642eeccb961c7c8cc61525a941fcb upstream.

Needed by the following fix.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index d81746d3b2da18477dd7b7db6b0c37b2123c817a..8d7151eb6cebc94d8b7197a64539803154058cdb 100644 (file)
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -603,5 +603,17 @@ static inline struct inode *vfs_select_inode(struct dentry *dentry,
        return inode;
 }
 
+/**
+ * d_real_inode - Return the real inode
+ * @dentry: The dentry to query
+ *
+ * If dentry is on an union/overlay, then return the underlying, real inode.
+ * Otherwise return d_inode().
+ */
+static inline struct inode *d_real_inode(struct dentry *dentry)
+{
+       return d_backing_inode(d_real(dentry));
+}
+
 
 #endif /* __LINUX_DCACHE_H */