Opening the misc block device in read-write mode runs afoul of
SELinux, which keeps the wipe code from working. Fix. Also change
various things to log to logcat so we can see them happening, for
future debugging.
Bug: 16715412
Change-Id: Ia14066f0a371cd605fcb544547b58a41acca70b9
uncrypt can read a file on an encrypted filesystem and rewrite it to
the same blocks on the underlying (unencrypted) block device. This
destroys the contents of the file as far as the encrypted filesystem
is concerned, but allows the data to be read without the encryption
key if you know which blocks of the raw device to access. uncrypt
produces a "block map" file which lists the blocks that contain the file.
For unencrypted filesystem, uncrypt will produce the block map without
touching the data.
Bug: 12188746
Change-Id: Ib7259b9e14dac8af406796b429d58378a00c7c63
