readahead update on splice reads

Andrew,

The two patches optimizes readahead invocations in splice reads:

readahead: move synchronous readahead call out of splice loop
readahead: pass real splice size

They can be appended to readahead-convert-splice-invocations.patch in -mm tree.

diffstat:

 fs/splice.c |   21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

Regards,
Fengguang
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