1693 persistent 'comment' field for a zpool

@@ -18,10 +18,12 @@
  *
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
+ * Copyright (c) 2011 by Delphix. All rights reserved.
  */
 
 #include <sys/zio.h>
 #include <sys/spa.h>
 #include <sys/zfs_acl.h>

@@ -67,10 +69,12 @@
             ZFS_TYPE_POOL, "<path>", "ALTROOT");
         zprop_register_string(ZPOOL_PROP_BOOTFS, "bootfs", NULL, PROP_DEFAULT,
             ZFS_TYPE_POOL, "<filesystem>", "BOOTFS");
         zprop_register_string(ZPOOL_PROP_CACHEFILE, "cachefile", NULL,
             PROP_DEFAULT, ZFS_TYPE_POOL, "<file> | none", "CACHEFILE");
+        zprop_register_string(ZPOOL_PROP_COMMENT, "comment", NULL,
+            PROP_DEFAULT, ZFS_TYPE_POOL, "<comment-string>", "COMMENT");
 
         /* readonly number properties */
         zprop_register_number(ZPOOL_PROP_SIZE, "size", 0, PROP_READONLY,
             ZFS_TYPE_POOL, "<size>", "SIZE");
         zprop_register_number(ZPOOL_PROP_FREE, "free", 0, PROP_READONLY,