ext4: show test_dummy_encryption mount option in /proc/mounts

When in effect, add "test_dummy_encryption" to _ext4_show_options() so
that it is shown in /proc/mounts and other relevant procfs files.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e41da553b430..a430fb3e9720 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2145,6 +2145,8 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
         if (test_opt(sb, DATA_ERR_ABORT))
                 SEQ_OPTS_PUTS("data_err=abort");
+        if (DUMMY_ENCRYPTION_ENABLED(sbi))
+                SEQ_OPTS_PUTS("test_dummy_encryption");
 
         ext4_show_quota_options(seq, sb);
         return 0;