From: mwilck@arcor.de <mwilck@arcor.de>
Date: Fri, 1 Mar 2013 22:28:24 +0000 (+0100)
Subject: DDF: increase seq number when writing meta data
X-Git-Tag: mdadm-3.3-rc1~114
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0175cbf62c588367c36776072c5654ac17177ad9;p=thirdparty%2Fmdadm.git

DDF: increase seq number when writing meta data

Cleanly increase the seq number when the DDF structures are
written, instead of always setting it back to 1.

Also, make sure that the sequential number of all headers and
VD conf records is the same.

Signed-off-by: Martin Wilck <mwilck@arcor.de>
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/super-ddf.c b/super-ddf.c
index dfbd5510..5eedbc30 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -2376,6 +2376,7 @@ static int __write_ddf_structure(struct dl *d, struct ddf_super *ddf, __u8 type,
 			c = (struct vcl *)d->spare;
 
 		if (c) {
+			c->conf.seqnum = ddf->primary.seq;
 			c->conf.crc = calc_crc(&c->conf, conf_size);
 			if (write(fd, &c->conf, conf_size) < 0)
 				break;
@@ -2408,12 +2409,20 @@ static int __write_init_super_ddf(struct supertype *st)
 	int successes = 0;
 	unsigned long long size;
 	char *null_aligned;
+	__u32 seq;
 
 	if (posix_memalign((void**)&null_aligned, 4096, NULL_CONF_SZ) != 0) {
 		return -ENOMEM;
 	}
 	memset(null_aligned, 0xff, NULL_CONF_SZ);
 
+	if (ddf->primary.seq != 0xffffffff)
+		seq = __cpu_to_be32(__be32_to_cpu(ddf->primary.seq)+1);
+	else if (ddf->secondary.seq != 0xffffffff)
+		seq = __cpu_to_be32(__be32_to_cpu(ddf->secondary.seq)+1);
+	else
+		seq = __cpu_to_be32(1);
+
 	/* try to write updated metadata,
 	 * if we catch a failure move on to the next disk
 	 */
@@ -2447,7 +2456,7 @@ static int __write_init_super_ddf(struct supertype *st)
 		else
 			ddf->anchor.secondary_lba =
 				__cpu_to_be64(size - 32*1024*2);
-		ddf->anchor.seq = __cpu_to_be32(1);
+		ddf->anchor.seq = seq;
 		memcpy(&ddf->primary, &ddf->anchor, 512);
 		memcpy(&ddf->secondary, &ddf->anchor, 512);