readahead: remove sync/async readahead call dependency

The readahead call scheme is error-prone in that it expects the call sites
to check for async readahead after doing a sync one.  I.e.

			if (!page)
				page_cache_sync_readahead();
			page = find_get_page();
			if (page && PageReadahead(page))
				page_cache_async_readahead();

This is because PG_readahead could be set by a sync readahead for the
_current_ newly faulted in page, and the readahead code simply expects one
more callback on the same page to start the async readahead.  If the
caller fails to do so, it will miss the PG_readahead bits and never able
to start an async readahead.

Eliminate this insane constraint by piggy-backing the async part into the
current readahead window.

Now if an async readahead should be started immediately after a sync one,
the readahead logic itself will do it.  So the following code becomes
valid: (the 'else' in particular)

			if (!page)
				page_cache_sync_readahead();
			else if (PageReadahead(page))
				page_cache_async_readahead();

Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>