From a19c88b83db3cc25affb75fe2d5531c964379d96 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Thu, 15 May 2008 16:48:18 +1000
Subject: [PATCH] Start on --assemble support for DDF

---
 Assemble.c  | 36 ++++++++++++++++++++++++++++++++++--
 super-ddf.c | 40 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 72 insertions(+), 4 deletions(-)

diff --git a/Assemble.c b/Assemble.c
index 86212032..16dec246 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -843,6 +843,24 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 	/* Almost ready to actually *do* something */
 	if (!old_linux) {
 		int rv;
+
+#ifndef MDASSEMBLE
+		struct mdinfo *sra;
+		if (st->ss->external) {
+			char ver[100];
+			strcat(strcpy(ver, "external:"), st->ss->text_version);
+			sra = sysfs_read(mdfd, 0, 0);
+			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 = sysfs_set_array(sra, &info);
+		} else
+#endif
 		if ((vers % 100) >= 1) { /* can use different versions */
 			mdu_array_info_t inf;
 			memset(&inf, 0, sizeof(inf));
@@ -893,8 +911,22 @@ int Assemble(struct supertype *st, char *mddev, int mdfd,
 				j = chosen_drive;
 
 			if (j >= 0 /* && devices[j].uptodate */) {
-				if (ioctl(mdfd, ADD_NEW_DISK,
-					  &devices[j].i.disk)!=0) {
+#ifndef MDASSEMBLE
+				if (st->ss->external) {
+					int fd = dev_open(devices[j].devname,
+							  O_RDONLY);
+					if (fd < 0)
+						rv = 1;
+					else {
+						rv = sysfs_add_disk(sra, fd,
+							      &devices[j].i);
+						close(fd);
+					}
+				} else
+#endif
+					rv = ioctl(mdfd, ADD_NEW_DISK,
+					  &devices[j].i.disk);
+				if (rv) {
 					fprintf(stderr, Name ": failed to add "
 						        "%s to %s: %s\n",
 						devices[j].devname,
diff --git a/super-ddf.c b/super-ddf.c
index 457470d7..b0ed7394 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -1149,6 +1149,7 @@ static void uuid_from_super_ddf(struct supertype *st, int uuid[4])
 static void getinfo_super_ddf(struct supertype *st, struct mdinfo *info)
 {
 	struct ddf_super *ddf = st->sb;
+	int i;
 
 	info->array.major_version = 1000;
 	info->array.minor_version = 0; /* FIXME use ddf->revision somehow */
@@ -1167,9 +1168,17 @@ static void getinfo_super_ddf(struct supertype *st, struct mdinfo *info)
 
 	info->disk.major = 0;
 	info->disk.minor = 0;
-//	info->disk.number = __be32_to_cpu(ddf->disk.refnum);
+	info->disk.number = __be32_to_cpu(ddf->dlist->disk.refnum);
 //	info->disk.raid_disk = find refnum in the table and use index;
-//	info->disk.state = ???;
+	info->disk.raid_disk = -1;
+	for (i = 0; i < __be16_to_cpu(ddf->phys->max_pdes) ; i++)
+		if (ddf->phys->entries[i].refnum == ddf->dlist->disk.refnum) {
+			info->disk.raid_disk = i;
+			break;
+		}
+	info->disk.state = (1 << MD_DISK_SYNC);
+
+	info->reshape_active = 0;
 
 //	uuid_from_super_ddf(info->uuid, sbv);
 
@@ -2248,6 +2257,31 @@ static int store_zero_ddf(struct supertype *st, int fd)
 	return 0;
 }
 
+static int compare_super_ddf(struct supertype *st, struct supertype *tst)
+{
+	/*
+	 * return:
+	 *  0 same, or first was empty, and second was copied
+	 *  1 second had wrong number
+	 *  2 wrong uuid
+	 *  3 wrong other info
+	 */
+	struct ddf_super *first = st->sb;
+	struct ddf_super *second = tst->sb;
+
+	if (!first) {
+		st->sb = tst->sb;
+		tst->sb = NULL;
+		return 0;
+	}
+
+	if (memcmp(first->anchor.guid, second->anchor.guid, DDF_GUID_LEN) != 0)
+		return 2;
+
+	/* FIXME should I look at anything else? */
+	return 0;
+}
+
 struct superswitch super_ddf = {
 #ifndef	MDASSEMBLE
 	.examine_super	= examine_super_ddf,
@@ -2263,6 +2297,8 @@ struct superswitch super_ddf = {
 
 	.avail_size	= avail_size_ddf,
 
+	.compare_super	= compare_super_ddf,
+
 	.load_super	= load_super_ddf,
 	.init_super	= init_zero_ddf,
 	.store_super	= store_zero_ddf,
-- 
2.39.2