dmraid/ddf-erase

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Allow dmraid to erase ddf metadata properly.
2 things go wrong:
1/ when seeking to the anchor, it seeks to far by a factor of 512
2/ when writing to the anchor, it writes 0 bytes, not 512.
Signed-off-by: NeilBrown <neilb@suse.de>
References: bnc#712671
---
lib/format/ddf/ddf1.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 1.0.0.rc16.orig/lib/format/ddf/ddf1.c
+++ 1.0.0.rc16/lib/format/ddf/ddf1.c
@@ -536,7 +536,7 @@ try_to_find_ddf1(struct lib_context *lc,
ddf1_sboffset) || !is_ddf1(lc, di, ddf1))
goto bad;
- ddf1->anchor_offset = ddf1_sboffset;
+ ddf1->anchor_offset = ddf1_sboffset / 512;
/* Convert endianness */
ddf1->in_cpu_format = 0;
@@ -967,6 +967,7 @@ setup_rd(struct lib_context *lc, struct
ma[i].offset = ddf1->primary->primary_table_lba;
ma->offset = ddf1->anchor_offset;
+ ma->size = 512;
(ma++)->area = &ddf1->anchor;
(ma++)->area = ddf1->primary;