EXT4_LABEL_MAX
/*78*/ char s_volume_name[EXT4_LABEL_MAX] __nonstring; /* volume name */
char new_label[EXT4_LABEL_MAX + 1];
if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
len = strnlen(new_label, EXT4_LABEL_MAX + 1);
if (len > EXT4_LABEL_MAX)
memset(new_label + len, 0, EXT4_LABEL_MAX - len);
char label[EXT4_LABEL_MAX + 1];
BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);