File DDF-allow-for-possibility-that-there-is-no-secondary.patch of Package mdadm

From b95cb4b9d88c8adf2adb7f2efef3ae3f72b27b8e Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Thu, 12 Sep 2013 14:57:28 +1000
Subject: [PATCH] DDF: allow for possibility that there is no secondary copy of
 metadata.

If there isn't, we currently write the second copy at some
random location :-)

Reported-and-tested-by:  Francis Moreau <francis.moro@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
 super-ddf.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/super-ddf.c b/super-ddf.c
index 636d7b4..d2cdda4 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -880,7 +880,8 @@ static int load_ddf_headers(int fd, struct ddf_super *super, char *devname)
 			super->primary.openflag && !super->secondary.openflag)
 			)
 			super->active = &super->secondary;
-	} else if (devname)
+	} else if (devname &&
+		   be64_to_cpu(super->anchor.secondary_lba) != ~(__u64)0)
 		pr_err("Failed to load secondary DDF header on %s\n",
 		       devname);
 	if (super->active == NULL)
@@ -2810,7 +2811,9 @@ static int add_to_super_ddf(struct supertype *st,
 	} while (0)
 	__calc_lba(dd, ddf->dlist, workspace_lba, 32);
 	__calc_lba(dd, ddf->dlist, primary_lba, 16);
-	__calc_lba(dd, ddf->dlist, secondary_lba, 32);
+	if (ddf->dlist == NULL ||
+	    be64_to_cpu(ddf->dlist->secondary_lba) != ~(__u64)0)
+		__calc_lba(dd, ddf->dlist, secondary_lba, 32);
 	pde->config_size = dd->workspace_lba;
 
 	sprintf(pde->path, "%17.17s","Information: nil") ;
@@ -2892,6 +2895,8 @@ static int __write_ddf_structure(struct dl *d, struct ddf_super *ddf, __u8 type)
 	default:
 		return 0;
 	}
+	if (sector == ~(__u64)0)
+		return 0;
 
 	header->type = type;
 	header->openflag = 1;
-- 
1.8.3.1.487.g3e7a5b4