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	#ifndef dbtob			#ifndef dbtob
	#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \			#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
	((off_t)(db) << DEV_BSHIFT)			((off_t)(db) << DEV_BSHIFT)
	#endif			#endif

	#define PRIMASK 0x0ff			#define PRIMASK 0x0ff
	#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */			#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
	#define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */			#define PDROP 0x200 /* OR'd with pri to stop re-entry of interlock mutex */
				#define PUSERW 0x400 /* OR'd with pri to denote waiting on the user */

	#define NZERO 0 /* default "nice" */			#define NZERO 0 /* default "nice" */

	#define NBBY 8 /* number of bits in a byte */			#define NBBY 8 /* number of bits in a byte */
	#define NBPW sizeof(int) /* number of bytes per word (integer) */			#define NBPW sizeof(int) /* number of bytes per word (integer) */

	#define CMASK 022 /* default file mask: S_IWGRP\|S_IWOTH */			#define CMASK 022 /* default file mask: S_IWGRP\|S_IWOTH */

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