Module Name:	src
Committed By:	chs
Date:		Fri Apr 30 04:32:08 UTC 1999

Modified Files:
	src/sys/nfs [chs-ubc]: nfs_bio.c
	src/sys/ufs/ufs [chs-ubc]: ufs_readwrite.c
	src/sys/uvm [chs-ubc]: uvm_bio.c uvm_extern.h
Log Message:
change ubc_alloc()'s length arg to be a pointer instead of the value.
the pointed-to value is the total desired length on input,
and is updated to the length that will fit in the returned window.
this allows callers of ubc_alloc() to be ignorant of the window size.