eCryptfs: track header bytes rather than extents

Remove internal references to header extents; just keep track of header bytes
instead.  Headers can easily span multiple pages with the recent persistent
file changes.

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>

diff --cc fs/ecryptfs/crypto.c
Simple merge

diff --cc fs/ecryptfs/ecryptfs_kernel.h
Simple merge

diff --cc fs/ecryptfs/inode.c
Simple merge

diff --cc fs/ecryptfs/main.c
Simple merge

diff --cc fs/ecryptfs/mmap.c
Simple merge