quoted

+	/* snap to EOF */
+	size += min(size, ra->ra_pages / 4);

  I'd probably choose:
	size += min(size / 2, ra->ra_pages / 4);
  to increase current window only to 3/2 and not twice but I don't have a

OK it looks good on large ra_pages. I'll use this form.

strong opinion. Otherwise I think the code is fine now so you can add:
  Acked-by: Jan Kara [off-list ref]

Thanks! 

Fengguang

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