1999-11-20 Roland McGrath <roland@baalperazim.frob.com>

	* dev.c (dev_read, dev_write): In DEV->inhibit_cache case,
	handle zero (i.e. unknown) block_size by treating it as 1.
	Use shift and bitwise-and rather than multiply and modulus
	for block size arithmetic, since it's a known power of two.

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