[git pull] vfs pile 1 (splice)

[Al Viro]

	splice stuff.  There are conflicts in lustre; proposed resolution
is in #merge-candidate (same as it is in linux-next).  There's a bunch of
branches this cycle, both mine and from other folks and I'd rather send
pull requests separately.  This one is the conversion of ->splice_read()
to ITER_PIPE iov_iter (and introduction of such).  Gets rid of a lot of
code in fs/splice.c and elsewhere; there will be followups, but these are
for the next cycle...  Some pipe/splice-related cleanups from Miklos in
the same branch as well.

The following changes since commit 08895a8b6b06ed2323cd97a36ee40a116b3db8ed:

  Linux 4.8-rc8 (2016-09-25 18:47:13 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.splice_read

for you to fetch changes up to a949e63992469fed87aef197347960ced31701b8:

  pipe: fix comment in pipe_buf_operations (2016-10-05 18:24:00 -0400)

----------------------------------------------------------------
Al Viro (11):
      consistent treatment of EFAULT on O_DIRECT read/write
      splice_to_pipe(): don't open-code wakeup_pipe_readers()
      splice: switch get_iovec_page_array() to iov_iter
      splice: lift pipe_lock out of splice_to_pipe()
      new helper: add_to_pipe()
      skb_splice_bits(): get rid of callback
      fuse_dev_splice_read(): switch to add_to_pipe()
      new iov_iter flavour: pipe-backed
      switch generic_file_splice_read() to use of ->read_iter()
      switch default_file_splice_read() to use of pipe-backed iov_iter
      relay: simplify relay_file_read()

Miklos Szeredi (5):
      pipe: add pipe_buf_get() helper
      pipe: add pipe_buf_release() helper
      pipe: add pipe_buf_confirm() helper
      pipe: add pipe_buf_steal() helper
      pipe: fix comment in pipe_buf_operations

 drivers/char/virtio_console.c                      |   2 +-
 drivers/staging/lustre/lustre/llite/file.c         |  89 +--
 .../staging/lustre/lustre/llite/llite_internal.h   |  15 +-
 drivers/staging/lustre/lustre/llite/vvp_internal.h |  14 -
 drivers/staging/lustre/lustre/llite/vvp_io.c       |  45 +-
 fs/coda/file.c                                     |  23 +-
 fs/direct-io.c                                     |   3 +
 fs/fuse/dev.c                                      |  63 +-
 fs/gfs2/file.c                                     |  28 +-
 fs/nfs/file.c                                      |  25 +-
 fs/nfs/internal.h                                  |   2 -
 fs/nfs/nfs4file.c                                  |   2 +-
 fs/ocfs2/file.c                                    |  34 +-
 fs/ocfs2/ocfs2_trace.h                             |   2 -
 fs/pipe.c                                          |  13 +-
 fs/splice.c                                        | 683 ++++++---------------
 fs/xfs/xfs_file.c                                  |  41 +-
 fs/xfs/xfs_trace.h                                 |   1 -
 include/linux/fs.h                                 |   2 -
 include/linux/pipe_fs_i.h                          |  59 +-
 include/linux/skbuff.h                             |   8 +-
 include/linux/splice.h                             |   3 +
 include/linux/uio.h                                |  14 +-
 kernel/relay.c                                     |  78 +--
 lib/iov_iter.c                                     | 395 +++++++++++-
 mm/shmem.c                                         | 115 +---
 net/core/skbuff.c                                  |  28 +-
 net/ipv4/tcp.c                                     |   3 +-
 net/kcm/kcmsock.c                                  |  16 +-
 net/unix/af_unix.c                                 |  17 +-
 30 files changed, 746 insertions(+), 1077 deletions(-)