From 7d5cd71da6987565d19701b1d102f882f659b815 Mon Sep 17 00:00:00 2001
From: Martin Matuska <mm@FreeBSD.org>
Date: Sun, 8 Apr 2012 13:16:46 -0400
Subject: [PATCH] Illumos #1346: zfs incremental receive may leave behind
 temporary clones

1356 zfs dataset prefetch code not working
Reviewed by: Matthew Ahrens <matt@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>

References to Illumos issue:
  https://www.illumos.org/issues/1346
  https://www.illumos.org/issues/1356

Ported-by: Richard Yao <ryao@cs.stonybrook.edu>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #647
---
 module/zfs/zfs_ioctl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/module/zfs/zfs_ioctl.c b/module/zfs/zfs_ioctl.c
index 90ebb57116..17dc35d74c 100644
--- a/module/zfs/zfs_ioctl.c
+++ b/module/zfs/zfs_ioctl.c
@@ -1923,8 +1923,10 @@ top:
 		uint64_t cookie = 0;
 		int len = sizeof (zc->zc_name) - (p - zc->zc_name);
 
-		while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0)
-			(void) dmu_objset_prefetch(p, NULL);
+		while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) {
+			if (!dataset_name_hidden(zc->zc_name))
+				(void) dmu_objset_prefetch(zc->zc_name, NULL);
+		}
 	}
 
 	do {