ecryptfs: remove version_str file from sysfs

static struct kobj_attribute version_attr = __ATTR_RO(version);

static struct ecryptfs_version_str_map_elem {

	u32 flag;

	char *str;

} ecryptfs_version_str_map[] = {

	{ECRYPTFS_VERSIONING_PASSPHRASE, "passphrase"},

	{ECRYPTFS_VERSIONING_PUBKEY, "pubkey"},

	{ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH, "plaintext passthrough"},

	{ECRYPTFS_VERSIONING_POLICY, "policy"},

	{ECRYPTFS_VERSIONING_XATTR, "metadata in extended attribute"},

	{ECRYPTFS_VERSIONING_MULTKEY, "multiple keys per file"}

};

static ssize_t version_str_show(struct kobject *kobj,

				struct kobj_attribute *attr, char *buff)

{

	int i;

	int remaining = PAGE_SIZE;

	int total_written = 0;

	buff[0] = '\0';

	for (i = 0; i < ARRAY_SIZE(ecryptfs_version_str_map); i++) {

		int entry_size;

		if (!(ECRYPTFS_VERSIONING_MASK

		      & ecryptfs_version_str_map[i].flag))

			continue;

		entry_size = strlen(ecryptfs_version_str_map[i].str);

		if ((entry_size + 2) > remaining)

			goto out;

		memcpy(buff, ecryptfs_version_str_map[i].str, entry_size);

		buff[entry_size++] = '\n';

		buff[entry_size] = '\0';

		buff += entry_size;

		total_written += entry_size;

		remaining -= entry_size;

	}

out:

	return total_written;

}

static struct kobj_attribute version_attr_str = __ATTR_RO(version_str);

static struct attribute *attributes[] = {

	&version_attr.attr,

	&version_attr_str.attr,

	NULL,

};