B_MAIL_ATTR_READ
if (node.WriteAttr(B_MAIL_ATTR_READ, B_INT32_TYPE, 0, &flag, sizeof(int32))
if (node.ReadAttr(B_MAIL_ATTR_READ, B_INT32_TYPE, 0, &flag, sizeof(int32))
fs_create_index(device, B_MAIL_ATTR_READ, B_INT32_TYPE, 0);
addAttribute(info, B_MAIL_ATTR_READ, "Read", B_INT32_TYPE,