diff -r d51a10d738ba -r 437422a29d3a usr/src/uts/common/fs/zfs/sys/zio.h
--- a/usr/src/uts/common/fs/zfs/sys/zio.h	Fri Apr 11 16:15:33 2008 -0700
+++ b/usr/src/uts/common/fs/zfs/sys/zio.h	Fri Apr 11 18:36:28 2008 -0700
@@ -20,7 +20,7 @@
  */
 
 /*
- * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -178,10 +178,11 @@
 #define	ZIO_PIPELINE_STOP		0x101
 
 /*
- * We'll take the unused errno 'EBADE' (from the Convergent graveyard)
- * to indicate checksum errors.
+ * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
+ * graveyard) to indicate checksum errors and fragmentation.
  */
 #define	ECKSUM	EBADE
+#define	EFRAGS	EBADR
 
 typedef struct zio zio_t;
 typedef void zio_done_func_t(zio_t *zio);