sdbfs: kerne/sdbfs-int: define htonll/ntohll for kernel space

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

sdbfs/kernel/sdbfs-int.h

@@ -22,4 +22,20 @@ struct sdbfs_inode {
 	struct inode ino;
 };
 
+/* This is needed to convert endianness. Hoping it is not defined elsewhere */
+static inline uint64_t htonll(uint64_t ll)
+{
+        uint64_t res;
+
+        if (htonl(1) == 1)
+                return ll;
+        res = htonl(ll >> 32);
+        res |= (uint64_t)(htonl((uint32_t)ll)) << 32;
+        return res;
+}
+static inline uint64_t ntohll(uint64_t ll)
+{
+	return htonll(ll);
+}
+
 #endif /* __SDBFS_INT_H__ */