From d03373f1deea242eaacfab6b2b0c4afc6d7702d2 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Thu, 15 May 2008 16:48:13 +1000
Subject: [PATCH] Some support for external metadata.

Allow specifying metadata type when creating arrays etc.
---
 Create.c | 33 ++++++++++++++++++++++++++++-----
 mdadm.h  |  2 ++
 util.c   |  4 +++-
 3 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/Create.c b/Create.c
index 19793fa4..6e58b535 100644
--- a/Create.c
+++ b/Create.c
@@ -71,6 +71,7 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 	int rv;
 	int bitmap_fd;
 	unsigned long long bitmapsize;
+	struct mdinfo *sra;
 	struct mdinfo info;
 
 	int major_num = BITMAP_MAJOR_HI;
@@ -485,8 +486,21 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 	}
 
 
+	sra = sysfs_read(mdfd, 0, 0);
 
-	if ((vers % 100) >= 1) { /* can use different versions */
+	if (st->ss->external) {
+		char ver[100];
+		strcat(strcpy(ver, "external:"), st->ss->text_version);
+		if ((vers % 100) < 2 ||
+		    sra == NULL ||
+		    sysfs_set_str(sra, NULL, "metadata_version",
+				  ver) < 0) {
+			fprintf(stderr, Name ": This kernel does not "
+				"support external metadata.\n");
+			return 1;
+		}
+		rv = 0;
+	} else	if ((vers % 100) >= 1) { /* can use different versions */
 		mdu_array_info_t inf;
 		memset(&inf, 0, sizeof(inf));
 		inf.major_version = st->ss->major;
@@ -524,7 +538,6 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 	}
 
 
-
 	for (pass=1; pass <=2 ; pass++) {
 		mddev_dev_t moved_disk = NULL; /* the disk that was moved out of the insert point */
 
@@ -570,13 +583,23 @@ int Create(struct supertype *st, char *mddev, int mdfd,
 			case 2:
 				close(fd);
 
-				if (ioctl(mdfd, ADD_NEW_DISK, &info.disk)) {
-					fprintf(stderr, Name ": ADD_NEW_DISK for %s failed: %s\n",
+				if (st->ss->external) {
+					char dv[100];
+					sprintf(dv, "%d:%d\n",
+						info.disk.major,
+						info.disk.minor);
+					sysfs_set_str(sra, NULL, "new_dev", dv);
+					/* FIXME check error */
+					/*FIXME find that device and set it up*/
+				} else if (ioctl(mdfd, ADD_NEW_DISK,
+						 &info.disk)) {
+					fprintf(stderr,
+						Name ": ADD_NEW_DISK for %s "
+						"failed: %s\n",
 						dv->devname, strerror(errno));
 					st->ss->free_super(st);
 					return 1;
 				}
-
 				break;
 			}
 			if (dv == moved_disk && dnum != insert_point) break;
diff --git a/mdadm.h b/mdadm.h
index 71903768..82f6cd9f 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -377,7 +377,9 @@ extern struct superswitch {
 				 int chunk, unsigned long long size,
 				 char *subdev, unsigned long long *freesize);
 	int major;
+	char *text_version;
 	int swapuuid; /* true if uuid is bigending rather than hostendian */
+	int external;
 } super0, super1, *superlist[];
 
 struct supertype {
diff --git a/util.c b/util.c
index 75f37064..733a466d 100644
--- a/util.c
+++ b/util.c
@@ -813,7 +813,9 @@ struct supertype *dup_super(struct supertype *st)
 	if (!st)
 		return st;
 
-	if (st->minor_version == -1)
+	if (st->ss->text_version)
+		strcpy(version, st->ss->text_version);
+	else if (st->minor_version == -1)
 		sprintf(version, "%d", st->ss->major);
 	else
 		sprintf(version, "%d.%d", st->ss->major, st->minor_version);
-- 
2.39.2