diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index 5aff0ee043..15f09ae883 100644
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -601,13 +601,6 @@ dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	return (err);
 }
 
-int
-dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
-    void *buf)
-{
-	return dmu_read_impl(os, object, offset, size, buf, 0);
-}
-
 void
 dmu_write_impl(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
     const void *buf, dmu_tx_t *tx, int flags)
@@ -651,6 +644,13 @@ dmu_write_impl(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	dmu_buf_rele_array(dbp, numbufs, FTAG);
 }
 
+void
+dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
+    const void *buf, dmu_tx_t *tx)
+{
+	dmu_write_impl(os, object, offset, size, buf, tx, 0);
+}
+
 void
 dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
     dmu_tx_t *tx)
@@ -672,13 +672,6 @@ dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	dmu_buf_rele_array(dbp, numbufs, FTAG);
 }
 
-void
-dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
-    const void *buf, dmu_tx_t *tx)
-{
-	dmu_write_impl(os, object, offset, size, buf, tx, 0);
-}
-
 #ifdef _KERNEL
 int
 dmu_read_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size)
@@ -1299,7 +1292,6 @@ dmu_fini(void)
 #if defined(_KERNEL) && defined(HAVE_SPL)
 EXPORT_SYMBOL(dmu_bonus_hold);
 EXPORT_SYMBOL(dmu_free_range);
-EXPORT_SYMBOL(dmu_read_impl);
 EXPORT_SYMBOL(dmu_read);
 EXPORT_SYMBOL(dmu_write_impl);
 EXPORT_SYMBOL(dmu_write);
diff --git a/module/zfs/include/sys/dmu.h b/module/zfs/include/sys/dmu.h
index d85d602546..d4dc194611 100644
--- a/module/zfs/include/sys/dmu.h
+++ b/module/zfs/include/sys/dmu.h
@@ -156,10 +156,8 @@ void zfs_znode_byteswap(void *buf, size_t size);
  * The maximum number of bytes that can be accessed as part of one
  * operation, including metadata.
  */
-#define DMU_MAX_ACCESS		(10<<20) /* 10MB */
-#define DMU_MAX_DELETEBLKCNT	(20480) /* ~5MB of indirect blocks */
-#define DMU_WRITE_ZEROCOPY	0x0001
-#define DMU_READ_ZEROCOPY	0x0002
+#define	DMU_MAX_ACCESS		(10<<20) /* 10MB */
+#define	DMU_MAX_DELETEBLKCNT	(20480) /* ~5MB of indirect blocks */
 
 #define	DMU_USERUSED_OBJECT	(-1ULL)
 #define	DMU_GROUPUSED_OBJECT	(-2ULL)
@@ -481,6 +479,8 @@ int dmu_free_object(objset_t *os, uint64_t object);
  */
 #define	DMU_READ_PREFETCH	0 /* prefetch */
 #define	DMU_READ_NO_PREFETCH	1 /* don't prefetch */
+#define	DMU_READ_ZEROCOPY	2 /* zerocopy on read (test) */
+#define	DMU_WRITE_ZEROCOPY	4 /* zerocopy on write (test) */
 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	void *buf, uint32_t flags);
 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,