If PV/VG uuids are missing, generate them from the pv/vg numbers.

[This situation could occur if the uuids were oritinally created by
LVM1 on a system without /dev/urandom.]

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/uuid/uuid.c b/lib/uuid/uuid.c
index 8083b7abe..8e4a1533e 100644
--- a/lib/uuid/uuid.c
+++ b/lib/uuid/uuid.c
@@ -25,6 +25,18 @@ int lvid_create(union lvid *lvid, struct id *vgid)
 	return 1;
 }
 
+void uuid_from_num(char *uuid, uint32_t num)
+{
+	unsigned i;
+
+	for (i = ID_LEN; i; i--) {
+		uuid[i - 1] = _c[num % (sizeof(_c) - 1)];
+		num /= sizeof(_c) - 1;
+	}
+
+	uuid[ID_LEN] = '\0';
+}
+
 int lvid_from_lvnum(union lvid *lvid, struct id *vgid, uint32_t lv_num)
 {
 	int i;
diff --git a/lib/uuid/uuid.h b/lib/uuid/uuid.h
index aa25773d7..ee7e36542 100644
--- a/lib/uuid/uuid.h
+++ b/lib/uuid/uuid.h
@@ -26,6 +26,8 @@ union lvid {
 int lvid_from_lvnum(union lvid *lvid, struct id *vgid, uint32_t lv_num);
 int lvnum_from_lvid(union lvid *lvid);
 
+void uuid_from_num(char *uuid, uint32_t num);
+
 int lvid_create(union lvid *lvid, struct id *vgid);
 int id_create(struct id *id);
 int id_valid(struct id *id);