[PATCH v5 23/39] richacl: Set the owner permissions to the owner mask

@@ -399,3 +399,45 @@ richacl_propagate_everyone(struct richacl_alloc *alloc)
 	}
 	return 0;
 }
+
+/**
+ * richacl_set_owner_permissions  -  set the owner permissions to the owner mask
+ *
+ * Change the acl so that owner@ is granted the permissions set in the owner
+ * mask.  This leaves at most one efective owner@ allow entry at the beginning
+ * of the acl.
+ */
+static int
+richacl_set_owner_permissions(struct richacl_alloc *alloc)
+{
+	unsigned int x = RICHACE_POSIX_ALWAYS_ALLOWED;
+	unsigned int owner_mask = alloc->acl->a_owner_mask & ~x;
+	unsigned int denied = 0;
+	struct richace *ace;
+
+	if (!owner_mask)
+		return 0;
+
+	richacl_for_each_entry(ace, alloc->acl) {
+		if (richace_is_owner(ace)) {
+			if (!richace_is_inherit_only(ace))
+				richace_change_mask(alloc, &ace, 0);
+		} else {
+			if (richace_is_deny(ace))
+				denied |= ace->e_mask;
+		}
+	}
+
+	if (owner_mask & (denied |
+			  ~alloc->acl->a_other_mask |
+			  ~alloc->acl->a_group_mask)) {
+		ace = alloc->acl->a_entries;
+		if (richacl_insert_entry(alloc, &ace))
+			return -1;
+		ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+		ace->e_flags = RICHACE_SPECIAL_WHO;
+		ace->e_mask = owner_mask;
+		ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+	}
+	return 0;
+}