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

1 files changed, 13 insertions, 0 deletions

diff --git a/UPDATING b/UPDATING
index c26b882edbb6..7c20df9618e2 100644
--- a/UPDATING
+++ b/UPDATING
@@ -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