svn commit: r322298 - head

[Kirk McKusick]

Author: mckusick
Date: Wed Aug  9 05:21:57 2017
New Revision: 322298
URL: https://svnweb.freebsd.org/changeset/base/322298

Log:
  Add an entry to UPDATING for r322297 which restores the ability
  of fsck to automatically find alternate superblocks when the
  standard one is trashed or unavailable.
  
  MFC after: 2 weeks
  Differential Revision: https://reviews.freebsd.org/D11589

Modified:
  head/UPDATING

Modified: head/UPDATING
==============================================================================
--- head/UPDATING	Wed Aug  9 05:17:21 2017	(r322297)
+++ head/UPDATING	Wed Aug  9 05:21:57 2017	(r322298)
@@ -51,6 +51,19 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 
 ****************************** SPECIAL WARNING: ******************************
 
+20170808:
+	Since the switch to GPT disk labels, fsck for UFS/FFS has been
+	unable to automatically find alternate superblocks. As of r322297,
+	the information needed to find alternate superblocks has been
+	moved to the end of the area reserved for the boot block.
+	Filesystems created with a newfs of this vintage or later
+	will create the recovery information. If you have a filesystem
+	created prior to this change and wish to have a recovery block
+	created for your filesystem, you can do so by running fsck in
+	forground mode (i.e., do not use the -p or -y options). As it
+	starts, fsck will ask ``SAVE DATA TO FIND ALTERNATE SUPERBLOCKS''
+	to which you should answer yes.
+
 20170728:
 	As of r321665, an NFSv4 server configuration that services
 	Kerberos mounts or clients that do not support the uid/gid in