Legal characters in encrypted fscrypto (f2fs/ext4) filename?

From	Eric Biggers <ebiggers3@gmail.com>
Newsgroups	linux.kernel
Subject	Legal characters in encrypted fscrypto (f2fs/ext4) filename?
Date	2016-04-01 08:10 +0200
Message-ID	<rj0rn-gd-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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Legal characters in encrypted fscrypto (f2fs/ext4) filename? Eric Biggers <ebiggers3@gmail.com> - 2016-04-01 08:10 +0200
  Re: Legal characters in encrypted fscrypto (f2fs/ext4) filename? Theodore Ts'o <tytso@mit.edu> - 2016-04-01 08:30 +0200

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