[PATCH] ecryptfs: show filename encryption options

[Yichong Chen <chenyichong@uniontech.com>]

ecryptfs_show_options() prints most user-visible mount options but
omits the filename encryption cipher and key size.

Print ecryptfs_fn_cipher and ecryptfs_fn_key_bytes when filename
encryption is enabled so that the displayed mount options reflect the
active filename encryption settings.

Fixes: 87c94c4df014 ("eCryptfs: Filename Encryption: mount option")
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
---
 fs/ecryptfs/super.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c
index 3bc21d677564..686b2b4a9cb5 100644
--- a/fs/ecryptfs/super.c
+++ b/fs/ecryptfs/super.c
@@ -150,6 +150,13 @@ static int ecryptfs_show_options(struct seq_file *m, struct dentry *root)
 	if (mount_crypt_stat->global_default_cipher_key_size)
 		seq_printf(m, ",ecryptfs_key_bytes=%zd",
 			   mount_crypt_stat->global_default_cipher_key_size);
+	if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
+		seq_printf(m, ",ecryptfs_fn_cipher=%s",
+			   mount_crypt_stat->global_default_fn_cipher_name);
+		if (mount_crypt_stat->global_default_fn_cipher_key_bytes)
+			seq_printf(m, ",ecryptfs_fn_key_bytes=%zd",
+				   mount_crypt_stat->global_default_fn_cipher_key_bytes);
+	}
 	if (mount_crypt_stat->flags & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)
 		seq_printf(m, ",ecryptfs_passthrough");
 	if (mount_crypt_stat->flags & ECRYPTFS_XATTR_METADATA_ENABLED)
-- 
2.51.0