Add mdas_empty_or_ignored() helper function.

Add a helper function to consolidate checking for an empty mdas list
or ignored mdas.  Ignored mdas should behave almost identically to
an empty mda list - the metadata areas should not be read or written
to.  This function will make it easier to implement metadata balancing
and easier to track pvs with an empty mda list or ignored mdas.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>

diff --git a/lib/metadata/metadata.c b/lib/metadata/metadata.c
index 03d2ae90f9eb216b1168d240df420d12bd008c56..907886a6e8959bb9dd8ad068efb54c3881b27aa1 100644 (file)
--- a/lib/metadata/metadata.c
+++ b/lib/metadata/metadata.c
@@ -4032,6 +4032,19 @@ unsigned pv_mda_set_ignored(const struct physical_volume *pv, unsigned ignored)
        return 1;
 }
 
+int mdas_empty_or_ignored(struct dm_list *mdas)
+{
+       struct metadata_area *mda;
+
+       if (!dm_list_size(mdas))
+               return 1;
+       dm_list_iterate_items(mda, mdas) {
+               if (mda_is_ignored(mda))
+                       return 1;
+       }
+       return 0;
+}
+
 uint32_t vg_seqno(const struct volume_group *vg)
 {
        return vg->seqno;

diff --git a/lib/metadata/metadata.h b/lib/metadata/metadata.h
index 22e5dbb43fa0a4cfd02c1054be93525425af801d..93c57f8246425e9e6a5ec2f84e8958eaacffacbd 100644 (file)
--- a/lib/metadata/metadata.h
+++ b/lib/metadata/metadata.h
@@ -185,6 +185,7 @@ void mda_set_ignored(struct metadata_area *mda, int value);
 unsigned mda_locns_match(struct metadata_area *mda1, struct metadata_area *mda2);
 void fid_add_mda(struct format_instance *fid, struct metadata_area *mda);
 int fid_add_mdas(struct format_instance *fid, struct dm_list *mdas);
+int mdas_empty_or_ignored(struct dm_list *mdas);
 
 #define seg_pvseg(seg, s)      (seg)->areas[(s)].u.pv.pvseg
 #define seg_dev(seg, s)                (seg)->areas[(s)].u.pv.pvseg->pv->dev