cleanup the filemap / direct I/O interaction

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Hi all,

this series cleans up some of the generic write helper calling
conventions and the page cache writeback / invalidation for
direct I/O.  This is a spinoff from the no-bufferhead kernel
project, for while we'll want to an use iomap based buffered
write path in the block layer.

diffstat:
 block/fops.c            |   18 ----
 fs/ceph/file.c          |    6 -
 fs/direct-io.c          |   10 --
 fs/ext4/file.c          |   12 ---
 fs/f2fs/file.c          |    3 
 fs/fuse/file.c          |   47 ++----------
 fs/gfs2/file.c          |    7 -
 fs/iomap/buffered-io.c  |   12 ++-
 fs/iomap/direct-io.c    |   88 ++++++++--------------
 fs/libfs.c              |   36 +++++++++
 fs/nfs/file.c           |    6 -
 fs/xfs/xfs_file.c       |    7 -
 fs/zonefs/file.c        |    4 -
 include/linux/fs.h      |    7 -
 include/linux/pagemap.h |    4 +
 mm/filemap.c            |  184 +++++++++++++++++++++---------------------------
 16 files changed, 190 insertions(+), 261 deletions(-)



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