readahead: convert filemap invocations
Convert filemap reads to use on-demand readahead. The new call scheme is to - call readahead on non-cached page - call readahead on look-ahead page - update prev_index when finished with the read request Signed-off-by: NFengguang Wu <wfg@mail.ustc.edu.cn> Cc: Steven Pratt <slpratt@austin.ibm.com> Cc: Ram Pai <linuxram@us.ibm.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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