diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 8310f73212..33e5cadd03 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -34,8 +34,6 @@ typedef struct SMgrEntry
 	SMgrRelation data;			/* Pointer to the SMgrRelationData */
 } SMgrEntry;
 
-static inline uint32 relfilenodebackend_hash(RelFileNodeBackend *rnode);
-
 /*
  * Because simplehash.h does not provide a stable pointer to hash table
  * entries, we don't make the element type a SMgrRelation directly, instead we
@@ -51,7 +49,7 @@ static inline uint32 relfilenodebackend_hash(RelFileNodeBackend *rnode);
 #define SH_ELEMENT_TYPE	SMgrEntry
 #define SH_KEY_TYPE		RelFileNodeBackend
 #define	SH_KEY			data->smgr_rnode
-#define SH_HASH_KEY(tb, key)	relfilenodebackend_hash(&key)
+#define SH_HASH_KEY(tb, key)	hash_bytes((const unsigned char *) &key, sizeof(RelFileNodeBackend))
 #define SH_EQUAL(tb, a, b)		(memcmp(&a, &b, sizeof(RelFileNodeBackend)) == 0)
 #define	SH_SCOPE		static inline
 #define SH_STORE_HASH
@@ -133,37 +131,6 @@ static dlist_head unowned_relns;
 /* local function prototypes */
 static void smgrshutdown(int code, Datum arg);
 
-/*
- * relfilenodebackend_hash
- *		Custom rolled hash function for simplehash table.
- *
- * smgropen() is often a bottleneck in CPU bound workloads during crash
- * recovery.  We make use of this custom hash function rather than using
- * hash_bytes as it gives us a little bit more performance.
- *
- * XXX What if sizeof(Oid) is not 4?
- */
-static inline uint32
-relfilenodebackend_hash(RelFileNodeBackend *rnode)
-{
-	uint32		hashkey;
-
-	hashkey = murmurhash32((uint32) rnode->node.spcNode);
-
-	/* rotate hashkey left 1 bit at each step */
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->node.dbNode);
-
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->node.relNode);
-
-	hashkey = pg_rotate_left32(hashkey, 1);
-	hashkey ^= murmurhash32((uint32) rnode->backend);
-
-	return hashkey;
-}
-
-
 /*
  *	smgrinit(), smgrshutdown() -- Initialize or shut down storage
  *								  managers.