[PATCH] eCryptfs: add flush_dcache_page() calls

Call flush_dcache_page() after modifying a pagecache by hand.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>