I am looking for some information on how its been planned to accommodate the feature such as passphrase recycle without the data re-encryption in fs/crypto or in e4crypt ? any idea ? Per fs/crypto and e4crypt (for the current master key derivation method) it appears to me that its not possible, unless I am missing something. ?
Indeed, this needs to be implemented by userspace, but e4crypt doesn't support it yet. I've Cc'ed Joe Richey; he's currently working on a userspace program called 'fscrypt' that will support this feature. There's also a design document at https://goo.gl/55cCrI you could take a look at.
Thanks. -Anand
