context readahead for concurrent IO

Andrew,

The context readahead patches have been floating around for a while.  Now that
Vladislav confirmed that it helps SCST IO performance, I'd like to push it for
more -mm testing outs. I believe this will help many concurrent IO workloads,
to name a few: NFS, SCST and even lighttpd.

The patchset is against linux-next, after the earlier filemap and readahead
cleanup/fix patches.

Thanks,
Fengguang
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