From 576d6d83af3e684bda417493cf64aab3ce235ab2 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Tue, 31 Jan 2006 00:01:48 +0000
Subject: [PATCH] Prefer version-1 superblocks for v.large devices.

Signed-off-by: Neil Brown <neilb@suse.de>
---
 Create.c | 21 +++++++++++++++++++++
 mdadm.c  |  8 --------
 super1.c |  3 ++-
 3 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/Create.c b/Create.c
index 7fbf9c02..71bab18b 100644
--- a/Create.c
+++ b/Create.c
@@ -214,6 +214,27 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 			ldsize = dsize;
 			ldsize <<= 9;
 		}
+		if (st == NULL) {
+			/* Need to choose a default metadata, which is different
+			 * depending on the sizes of devices
+			 */
+			int i;
+			char *name = "default";
+			if (level >= 1 && ldsize > (0x7fffffffULL<<10))
+				name = "default/large";
+			for(i=0; !st && superlist[i]; i++)
+				st = superlist[i]->match_metadata_desc(name);
+
+			if (!st) {
+				fprintf(stderr, Name ": internal error - no default metadata style\n");
+				exit(2);
+			}
+			if (st->ss->major != 0 ||
+			    st->minor_version != 90)
+				fprintf(stderr, Name ": Defaulting to verion %d.%d metadata\n",
+					st->ss->major,
+					st->minor_version);
+		}
 		freesize = st->ss->avail_size(st, ldsize >> 9);
 		if (freesize == 0) {
 			fprintf(stderr, Name ": %s is too small: %luK\n",
diff --git a/mdadm.c b/mdadm.c
index f5f64b56..925c01fe 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1006,14 +1006,6 @@ int main(int argc, char *argv[])
 			rv = 1;
 			break;
 		}
-		if (ss == NULL) {
-			for(i=0; !ss && superlist[i]; i++) 
-				ss = superlist[i]->match_metadata_desc("default");
-		}
-		if (!ss) {
-			fprintf(stderr, Name ": internal error - no default metadata style\n");
-			exit(2);
-		}
 
 		rv = Create(ss, devlist->devname, mdfd, chunk, level, layout, size<0 ? 0 : size,
 			    raiddisks, sparedisks, ident.name,
diff --git a/super1.c b/super1.c
index 62494a6e..afe29984 100644
--- a/super1.c
+++ b/super1.c
@@ -911,7 +911,8 @@ static struct supertype *match_metadata_desc1(char *arg)
 	st->ss = &super1;
 	st->max_devs = 384;
 	if (strcmp(arg, "1") == 0 ||
-	    strcmp(arg, "1.0") == 0) {
+	    strcmp(arg, "1.0") == 0 ||
+	    strcmp(arg, "default/large") == 0) {
 		st->minor_version = 0;
 		return st;
 	}
-- 
2.39.2