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    DateMon, 26 Sep 2005 21:24:46 -0700
    FromAndrew Morton <>
    SubjectRe: Readahead
    Alan Stern <stern@rowland.harvard.edu> wrote:
    >
    >  Can somebody please tell me where the code is that performs optimistic
    >  readahead when a process does sequential reads on a block device?
    
    mm/readahead.c:__do_page_cache_readahead() is the main one.  Use
    dump_stack() to be sure.
    
    >  And can someone explain why those readahead calls are allowed to extend 
    >  beyond the end of the device?
    
    It has a check in there for reads past the blockdev mapping's i_size. 
    Maybe i_size is wrong, or maybe the code is wrong, or maybe it's a
    different caller.
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