Hi John,

Wow, thanks for stepping up and taking a crack at this!

Just a few words of feedback on your concerns about leaking that long
filenames exist...

I agree that meta leakage is suboptimal, and should be avoided when
possible.

On the other hand, this sort of thing happens elsewhere with eCryptfs.
 File permissions, owners, and timestamps all must be stored in the
clear, as well as file structures.  That's sometimes enough to
identify which file is which.

I've always preferred calling eCryptfs' filename "encryption" ->
"obfuscation", which is a more accurate description, in my opinion.
File contents are most certainly encrypted, in a rather strong manner.
 File names and file metadata are merely obfuscated.  ie, the filename
is not immediately available, but enough metadata about the file
(perms, owners, timestamps, rough sizes) to make reasonable guesses as
to real filenames in a regularly laid out filesystem.

Dustin

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https://bugs.launchpad.net/bugs/344878

Title:
  file name too long when creating new file (ecryptfs_lookup: lookup_one_len() 
returned [-36] on lower_dentry)

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