Comment 10 for bug 1699427

Let me organize my thoughts. The purpose is that you want to use mysql in the mounted directory, right?
If so, please do this step by step.
1. Create two directories, say, <encrypted> and <decrypted>.
2. Execute "sudo mount -t ecryptfs <encrypted> <decrypted>"
3. Then use basic file operations command and manipulate mysql in <decrypted> to see what will happen.