direct_IO: remove rw from a_ops->direct_IO()

Now that no one is using rw, remove it completely.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc Documentation/filesystems/Locking
Simple merge

diff --cc Documentation/filesystems/vfs.txt
Simple merge

diff --cc drivers/staging/lustre/lustre/llite/rw26.c
Simple merge

diff --cc fs/9p/vfs_addr.c
Simple merge

diff --cc fs/affs/file.c
Simple merge

diff --cc fs/block_dev.c
Simple merge

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

diff --cc fs/ceph/addr.c
Simple merge

diff --cc fs/cifs/file.c
Simple merge

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

diff --cc fs/ext2/inode.c
Simple merge

diff --cc fs/ext3/inode.c
Simple merge

diff --cc fs/ext4/inode.c
Simple merge

diff --cc fs/f2fs/data.c
Simple merge

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

diff --cc fs/fuse/file.c
Simple merge

diff --cc fs/gfs2/aops.c
Simple merge

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

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

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

diff --cc fs/nfs/direct.c
Simple merge

diff --cc fs/nilfs2/inode.c
Simple merge

diff --cc fs/ocfs2/aops.c
Simple merge

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

diff --cc fs/udf/file.c
Simple merge

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

diff --cc fs/xfs/xfs_aops.c
Simple merge

diff --cc include/linux/fs.h
Simple merge

diff --cc include/linux/nfs_fs.h
Simple merge

diff --cc mm/filemap.c
Simple merge

diff --cc mm/page_io.c
Simple merge