Hello,

While reviewing the new filesystem encryption code, I was confused by the
intended set of legal characters in the printable form of an encrypted filename.

According to the actual code in fs/crypto/fname.c, the legal characters are:

        a-zA-Z0-9+,

Alternatively, according to the comment in the same file, the legal characters
are actually:

        a-zA-Z0-9+_

Still alternatively, according to the design document[1], the legal characters
are actually:

        a-zA-Z0-9+=

Which one is correct?

[1] 
https://docs.google.com/document/d/1ft26lUQyuSpiu6VleP70_npaWdRfXFoNnB8JYnykNTg/preview?pref=2&pli=1#

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