On Wed, Jul 23, 2014 at 3:34 PM, Pavel Machek [off-list ref] wrote:

On Thu 2014-07-24 00:25:06, Pavel Machek wrote:

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Hi!

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This patchset proposes a method for encrypting in EXT4 data read and
write paths. It's a proof-of-concept/prototype only right
now. Outstanding issues:

 * While it seems to work well with complex tasks like a parallel
   kernel build, fsx is pretty good at reliably breaking it in its
   current form. I think it's trying to decrypt a page of all zeros
   when doing a mmap'd write after an falloc. I want to get feedback
   on the overall approach before I spend too much time bug-hunting.

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Can I keep just a subtree (/home/pavel/.ssh) encrypted?

Ok, as far as I can tell no, this is whole filesystem encryption for
now. I guess encrypting based on some attribute is planned...?

Correct; that's TBD as part of the LSS discussion next month. You can see
it wouldn't be that far-fetched to add an xattr to the parent directory that
specifies the key sig to use. It's just that unexpected things can happen
with hard links.