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From: Martin Matuska <mm@FreeBSD.org>
Date: Tue, 11 May 2010 09:19:41 +0000 (UTC)
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Cc: 
Subject: svn commit: r207909 -
	head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: mm
Date: Tue May 11 09:19:41 2010
New Revision: 207909
URL: http://svn.freebsd.org/changeset/base/207909

Log:
  Fix zfs rename (may occasionally fail with dataset busy).
  
  OpenSolaris onnv revision:	8517:41a0783dde17
  
  PR:		kern/146471
  Approved by:	pjd, delphij (mentor)
  Obtained from:	OpenSolaris (Bug ID 6784757)
  MFC after:	3 days

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c	Tue May 11 07:25:13 2010	(r207908)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_dataset.c	Tue May 11 09:19:41 2010	(r207909)
@@ -19,7 +19,7 @@
  * CDDL HEADER END
  */
 /*
- * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
@@ -2205,6 +2205,12 @@ dsl_dataset_rename(char *oldname, const 
 	err = dsl_dir_open(oldname, FTAG, &dd, &tail);
 	if (err)
 		return (err);
+	/*
+	 * If there are more than 2 references there may be holds
+	 * hanging around that haven't been cleared out yet.
+	 */
+	if (dmu_buf_refcount(dd->dd_dbuf) > 2)
+		txg_wait_synced(dd->dd_pool, 0);
 	if (tail == NULL) {
 		int delta = strlen(newname) - strlen(oldname);