metadata: add add_glv_to_indirect_glvs and remove_glv_from_indirect_glvs

The add_glv_to_indirect_glvs is a helper function that registers a
volume represented by struct generic_logical_volume instance ("glv")
as an indirect user of another volume ("origin_glv") and vice versa -
it also registers the other volume ("origin_glv") as indirect_origin
of user volume ("glv").

The remove_glv_from_indirect_glvs does the opposite.

diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
index da607708593cea4c92c31fe328bb670582176e6b..399668ccbaf8c4481d78166c48f14d3df7a7b632 100644 (file)
--- a/lib/metadata/lv_manip.c
+++ b/lib/metadata/lv_manip.c
@@ -5343,6 +5343,64 @@ struct glv_list *get_or_create_glvl(struct dm_pool *mem, struct logical_volume *
        return glvl;
 }
 
+int add_glv_to_indirect_glvs(struct dm_pool *mem,
+                                 struct generic_logical_volume *origin_glv,
+                                 struct generic_logical_volume *glv)
+{
+       struct glv_list *glvl;
+
+       if (!(glvl = dm_pool_zalloc(mem, sizeof(struct glv_list)))) {
+               log_error("Failed to allocate generic volume list item "
+                         "for indirect glv %s", glv->is_historical ? glv->historical->name
+                                                                   : glv->live->name);
+               return 0;
+       }
+
+       glvl->glv = glv;
+
+       if (glv->is_historical)
+               glv->historical->indirect_origin = origin_glv;
+       else
+               first_seg(glv->live)->indirect_origin = origin_glv;
+
+       if (origin_glv) {
+               if (origin_glv->is_historical)
+                       dm_list_add(&origin_glv->historical->indirect_glvs, &glvl->list);
+               else
+                       dm_list_add(&origin_glv->live->indirect_glvs, &glvl->list);
+       }
+
+       return 1;
+}
+
+int remove_glv_from_indirect_glvs(struct generic_logical_volume *origin_glv,
+                                 struct generic_logical_volume *glv)
+{
+       struct glv_list *glvl, *tglvl;
+       struct dm_list *list = origin_glv->is_historical ? &origin_glv->historical->indirect_glvs
+                                                        : &origin_glv->live->indirect_glvs;
+
+       dm_list_iterate_items_safe(glvl, tglvl, list) {
+               if (glvl->glv != glv)
+                       continue;
+
+               dm_list_del(&glvl->list);
+
+               if (glvl->glv->is_historical)
+                       glvl->glv->historical->indirect_origin = NULL;
+               else
+                       first_seg(glvl->glv->live)->indirect_origin = NULL;
+
+               return 1;
+       }
+
+       log_error(INTERNAL_ERROR "%s logical volume %s is not a user of %s.",
+                 glv->is_historical ? "historical" : "Live",
+                 glv->is_historical ? glv->historical->name : glv->live->name,
+                 origin_glv->is_historical ? origin_glv->historical->name : origin_glv->live->name);
+       return 0;
+}
+
 struct logical_volume *alloc_lv(struct dm_pool *mem)
 {
        struct logical_volume *lv;

diff --git a/lib/metadata/metadata.h b/lib/metadata/metadata.h
index 91e596138148d8692ac5fac16b75fcd457f136d3..33cbfa649d216a11e6dbb9860b509c76951339dd 100644 (file)
--- a/lib/metadata/metadata.h
+++ b/lib/metadata/metadata.h
@@ -440,6 +440,12 @@ int lv_split_segment(struct logical_volume *lv, uint32_t le);
 int add_seg_to_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
 int remove_seg_from_segs_using_this_lv(struct logical_volume *lv, struct lv_segment *seg);
 
+int add_glv_to_indirect_glvs(struct dm_pool *mem,
+                            struct generic_logical_volume *origin_glv,
+                            struct generic_logical_volume *user_glv);
+int remove_glv_from_indirect_glvs(struct generic_logical_volume *glv,
+                                 struct generic_logical_volume *user_glv);
+
 int for_each_sub_lv_except_pools(struct logical_volume *lv,
                                 int (*fn)(struct logical_volume *lv, void *data),
                                 void *data);