diff --git a/check/main.c b/check/main.c
index 788a6f0e..49bdbfec 100644
--- a/check/main.c
+++ b/check/main.c
@@ -40,7 +40,6 @@
 #include "common/rbtree-utils.h"
 #include "backref.h"
 #include "kernel-shared/ulist.h"
-#include "hash.h"
 #include "common/help.h"
 #include "check/common.h"
 #include "check/mode-common.h"
diff --git a/check/mode-common.c b/check/mode-common.c
index 9e81082b..8fe1ea8e 100644
--- a/check/mode-common.c
+++ b/check/mode-common.c
@@ -16,7 +16,6 @@
 
 #include <time.h>
 #include "ctree.h"
-#include "hash.h"
 #include "common/internal.h"
 #include "common/messages.h"
 #include "transaction.h"
diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index 630fabf6..0011284f 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -21,7 +21,6 @@
 #include "common/messages.h"
 #include "disk-io.h"
 #include "backref.h"
-#include "hash.h"
 #include "common/internal.h"
 #include "common/utils.h"
 #include "volumes.h"
diff --git a/ctree.h b/ctree.h
index b44fdd5a..36f62732 100644
--- a/ctree.h
+++ b/ctree.h
@@ -29,6 +29,7 @@
 #include "extent_io.h"
 #include "ioctl.h"
 #include "kernel-lib/sizes.h"
+#include "crypto/crc32c.h"
 #else
 #include <btrfs/list.h>
 #include <btrfs/kerncompat.h>
@@ -37,6 +38,7 @@
 #include <btrfs/extent_io.h>
 #include <btrfs/ioctl.h>
 #include <btrfs/sizes.h>
+#include "btrfs/crc32c.h"
 #endif /* BTRFS_FLAT_INCLUDES */
 
 struct btrfs_root;
@@ -2510,6 +2512,20 @@ static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
 	((unsigned long)(btrfs_leaf_data(leaf) + \
 	btrfs_item_offset_nr(leaf, slot)))
 
+static inline u64 btrfs_name_hash(const char *name, int len)
+{
+	return crc32c((u32)~1, name, len);
+}
+
+/*
+ * Figure the key offset of an extended inode ref
+ */
+static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
+				    int len)
+{
+	return (u64)btrfs_crc32c(parent_objectid, name, len);
+}
+
 /* extent-tree.c */
 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
 			 struct btrfs_root *root,
diff --git a/dir-item.c b/dir-item.c
index fa69dd1d..c8a5a354 100644
--- a/dir-item.c
+++ b/dir-item.c
@@ -19,7 +19,6 @@
 #include <linux/limits.h>
 #include "ctree.h"
 #include "disk-io.h"
-#include "hash.h"
 #include "transaction.h"
 
 static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
diff --git a/hash.h b/hash.h
deleted file mode 100644
index 51e84204..00000000
--- a/hash.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright (C) 2007 Oracle.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#ifndef __BTRFS_HASH_H__
-#define __BTRFS_HASH_H__
-
-#include "crypto/crc32c.h"
-
-static inline u64 btrfs_name_hash(const char *name, int len)
-{
-	return crc32c((u32)~1, name, len);
-}
-
-/*
- * Figure the key offset of an extended inode ref
- */
-static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name,
-				    int len)
-{
-	return (u64)btrfs_crc32c(parent_objectid, name, len);
-}
-
-#endif
diff --git a/inode-item.c b/inode-item.c
index 1cc10667..aef1a235 100644
--- a/inode-item.c
+++ b/inode-item.c
@@ -19,7 +19,6 @@
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
-#include "hash.h"
 
 static int find_name_in_backref(struct btrfs_path *path, const char * name,
 			 int name_len, struct btrfs_inode_ref **ref_ret)