Alan Stern <[email protected]> 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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