The upstream version of the direct I/O on encrypted files patch series
missed exporting this function, which is needed if ext4 is built as a
module.
Bug: 162255927
Fixes: 0ea0eb628fee ("FROMLIST: fscrypt: Add functions for direct I/O support")
Change-Id: Ib827b4743423c7446436a47fcf95b255466288a3
Signed-off-by: Satya Tangirala <satyat@google.com>