From 13fe019870c8779bf2f5b3ff731b512cf89133ef Mon Sep 17 00:00:00 2001
From: Matthew Ahrens <mahrens@delphix.com>
Date: Wed, 4 Sep 2013 07:00:57 -0500
Subject: Illumos #3464

3464 zfs synctask code needs restructuring
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

References:
  https://www.illumos.org/issues/3464
  illumos/illumos-gate@3b2aab18808792cbd248a12f1edf139b89833c13

Ported-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1495
---
 module/zfs/dnode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'module/zfs/dnode.c')

diff --git a/module/zfs/dnode.c b/module/zfs/dnode.c
index d8d66513d..d88134d72 100644
--- a/module/zfs/dnode.c
+++ b/module/zfs/dnode.c
@@ -74,7 +74,11 @@ dnode_cons(void *arg, void *unused, int kmflag)
 	mutex_init(&dn->dn_dbufs_mtx, NULL, MUTEX_DEFAULT, NULL);
 	cv_init(&dn->dn_notxholds, NULL, CV_DEFAULT, NULL);
 
-	refcount_create(&dn->dn_holds);
+	/*
+	 * Every dbuf has a reference, and dropping a tracked reference is
+	 * O(number of references), so don't track dn_holds.
+	 */
+	refcount_create_untracked(&dn->dn_holds);
 	refcount_create(&dn->dn_tx_holds);
 	list_link_init(&dn->dn_link);
 
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