Ian Lepore 74938cbb7f Make the F_READAHEAD option to fcntl(2) work as documented: a value of zero
now disables read-ahead.  It used to effectively restore the system default
readahead hueristic if it had been changed; a negative value now restores
the default.

Reviewed by:	kib
2013-02-13 15:09:16 +00:00
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