The code was using encrypted_upto == 0 as an indicator that encryption
has succeeded. This meant that if no encryption happened, we would reboot
continually.
We now set encrypted_upto to fs_size when encryption is complete.
Also don't start to encrypt unless we are at 10% power. Stop when we
get to 5% power. This should lead to partial encryptions only very
rarely.
Bug: 15513202
Change-Id: I6214d78579d1fbbe2f63ee8862473d86a89d29b3
Stop encryption when battery is low, mark position, and continue on reboot.
Note - support for multiple encrypted volumes removed as no devices seem
to exist with an fstab that uses this feature. If you want support for such
a device, contact me and we will re-add it with appropriate testing.
Bug: 13284213
Change-Id: I1f7178e4f7dd8ea816cbc03ab5c4f6543e98acaa