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From: "Andrey V. Elsukov" <ae@FreeBSD.org>
Date: Wed, 1 Mar 2017 18:03:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r314497 -
 head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: ae
Date: Wed Mar  1 18:03:32 2017
New Revision: 314497
URL: https://svnweb.freebsd.org/changeset/base/314497

Log:
  Do not invoke the resize event when previous provider's size was zero.
  This is similar to r303637 fix for geom_disk.
  
  Reported by:	avg
  Tested by:	avg
  MFC after:	1 week

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

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Wed Mar  1 17:35:56 2017	(r314496)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c	Wed Mar  1 18:03:32 2017	(r314497)
@@ -278,7 +278,16 @@ zvol_size_changed(zvol_state_t *zv, uint
 		if (pp == NULL)
 			return;
 		g_topology_lock();
-		g_resize_provider(pp, zv->zv_volsize);
+
+		/*
+		 * Do not invoke resize event when initial size was zero.
+		 * ZVOL initializes the size on first open, this is not
+		 * real resizing.
+		 */
+		if (pp->mediasize == 0)
+			pp->mediasize = zv->zv_volsize;
+		else
+			g_resize_provider(pp, zv->zv_volsize);
 		g_topology_unlock();
 	}
 #endif	/* illumos */