RFC Fix splice for packetized pipes

With introduction of packetized pipes, splice wasn't updated to respect this new behaviour.
In terms of splice it means, that it never set PIPE_BUF_FLAG_PACKET on created pipe buffer regarless pipe operating mode, thus breaking the whole logic.
To fix this, new SPLICE_F_PACKET flag was introduced. It's supposed to be used only in kernel and set, when write pipe is in packetized mode. In splice_to_pipe() it's converted into created pipe buffer PIPE_BUF_FLAG_PACKET flag.

The following series implements...

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Stanislav Kinsburskiy (3):
pipe: make is_packetized() non-static and declare in pipe_fs_i.h
splice: new SPLICE_F_PACKET flag introduced
splice: add support of splicing to packetized pipe

 fs/pipe.c                 |    2 +-
 fs/splice.c               |    8 ++++++++
 include/linux/pipe_fs_i.h |    2 ++
 include/linux/splice.h    |    5 +++++
 4 files changed, 16 insertions(+), 1 deletion(-)