fscrypt API cleanups

[Christoph Hellwig <hch@lst.de>]

Hi all,

this series cleans up various fscrypt APIs to pass logical offsets in
and lengths in bytes, and on-disk sectors as 512-byte sector units,
like most of the VFS and block code.

Note that this is based on top of fscrypt/for-current and not
fscrypt/for-next to pick up "fscrypt: fix left shift underflow when
inode->i_blkbits > PAGE_SHIFT".  There also is a minor conflict in
linux-next with the iomap tree tue to that tree changing and adjacent
line to one changes in this patch.

Eric only asked for the first two patches to be sent out, but I more of
my stack as I think it should be useful.  Feel free to apply as many
as you think are suitable.

Diffstat:
 fs/crypto/bio.c             |  108 +++++++++++++++++++++++++-------------------
 fs/crypto/fscrypt_private.h |    3 -
 fs/crypto/inline_crypt.c    |   34 ++++++-------
 fs/crypto/keysetup.c        |    2 
 fs/ext4/inode.c             |    5 +-
 fs/ext4/readpage.c          |    7 +-
 fs/f2fs/data.c              |    7 ++
 fs/f2fs/file.c              |    4 +
 fs/iomap/direct-io.c        |    6 --
 include/linux/fscrypt.h     |   19 +++----
 10 files changed, 105 insertions(+), 90 deletions(-)