teach imsm and ddf what st->subarray means at load_super time

RebuildMap wants to poll through mdstat and retrieve a (kernel name,
uuid, user name) tuple for each array.  Teach imsm and ddf to honor
st->sub_array at ->load_super() time to set their internal subarray
pointers to the value specified in st->subarray, or return an error if
st->subarray specifies an invalid array.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/super-ddf.c b/super-ddf.c
index 5ad89c2..517a586 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -835,6 +835,18 @@ static int load_super_ddf(struct supertype *st, int fd,
 		return rv;
 	}
 
+	if (st->subarray[0]) {
+		struct vcl *v;
+
+		for (v = super->conflist; v; v = v->next)
+			if (v->vcnum == atoi(st->subarray))
+				super->currentconf = v;
+		if (!super->currentconf) {
+			free(super);
+			return 1;
+		}
+	}
+
 	/* Should possibly check the sections .... */
 
 	st->sb = super;