On 2016-03-01 11:46, Chris Mason wrote:
On Tue, Mar 01, 2016 at 05:29:52PM +0100, Tomasz Torcz wrote:
On Wed, Mar 02, 2016 at 12:08:09AM +0800, Anand Jain wrote:
This patchset adds btrfs encryption support.

Warning:
The code is in prototype/experimental stage and is not suitable
for the production data yet.

   Can you share some design documents?  Will it be compatible
with existing encrypting filesystems:
  – ext4 ?
  – ZFS ?

   It would be nice to have common API for encryption, not a dozen
of filesystem-specific interfaces.

We'll definitely move in line with the common API over time.  Thanks
Anand for starting this!

I'd prefer that we keep it per-subvolume for now, just because
subvolumes are so cheap and because it seems like a better collection
point for general use.  But as the other filesystems add features we'll
make sure and keep parity with what users expect.
I hate to tell you, but if you want feature parity, it needs to have \ per-file functionality from the start. Both ext4 and F2FS do per-file, as does NTFS (not certain about ZFS, but people are not as likely to be coming to BTRFS from ZFS as they are from ext4 or F2FS from what I've seen).

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