OpenZFS 7304 - zfs filesystem/snapshot counts should be read-only

Authored by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7304
OpenZFS-commit: openzfs/openzfs@007a6c1
Closes #5624

module/zcommon/zfs_prop.c

@@ -22,6 +22,7 @@
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2011, 2014 by Delphix. All rights reserved.
  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
+ * Copyright 2016, Joyent, Inc.
  */
 
 /* Portions Copyright 2010 Robert Milkowski */
@@ -432,6 +433,12 @@ zfs_prop_init(void)
 	    PROP_READONLY, ZFS_TYPE_DATASET, "<size>", "LUSED");
 	zprop_register_number(ZFS_PROP_LOGICALREFERENCED, "logicalreferenced",
 	    0, PROP_READONLY, ZFS_TYPE_DATASET, "<size>", "LREFER");
+	zprop_register_number(ZFS_PROP_FILESYSTEM_COUNT, "filesystem_count",
+	    UINT64_MAX, PROP_READONLY, ZFS_TYPE_FILESYSTEM,
+	    "<count>", "FSCOUNT");
+	zprop_register_number(ZFS_PROP_SNAPSHOT_COUNT, "snapshot_count",
+	    UINT64_MAX, PROP_READONLY, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
+	    "<count>", "SSCOUNT");
 
 	/* default number properties */
 	zprop_register_number(ZFS_PROP_QUOTA, "quota", 0, PROP_DEFAULT,
@@ -452,12 +459,6 @@ zfs_prop_init(void)
 	zprop_register_number(ZFS_PROP_SNAPSHOT_LIMIT, "snapshot_limit",
 	    UINT64_MAX, PROP_DEFAULT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
 	    "<count> | none", "SSLIMIT");
-	zprop_register_number(ZFS_PROP_FILESYSTEM_COUNT, "filesystem_count",
-	    UINT64_MAX, PROP_DEFAULT, ZFS_TYPE_FILESYSTEM,
-	    "<count>", "FSCOUNT");
-	zprop_register_number(ZFS_PROP_SNAPSHOT_COUNT, "snapshot_count",
-	    UINT64_MAX, PROP_DEFAULT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
-	    "<count>", "SSCOUNT");
 
 	/* inherit number properties */
 	zprop_register_number(ZFS_PROP_RECORDSIZE, "recordsize",