Convert readpage, prepare_write, and commit_write to use read_write.c
routines.  Remove sync_page; I cannot think of a good reason for implementing
that in eCryptfs.
Signed-off-by: NMichael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>