increase system-wide filename limit to 255

. move mfs-specific struct, constants to mfs/, so
	  mfs-specific, on-disk format structs and consts are
	  fully isolated from generic structs and functions
	. removes de and readfs utils

nbsd_include/sys/Makefile

@@ -12,7 +12,7 @@ INCS+= ioc_net.h statfs.h
 INCS+=	ansi.h atomic.h \
 	bitops.h bswap.h \
 	cdefs.h cdefs_aout.h cdefs_elf.h ctype_bits.h ctype_inline.h \
-	dir.h dirent.h exec_elf.h \
+	dirent.h exec_elf.h \
 	endian.h errno.h \
 	fcntl.h fd_set.h featuretest.h file.h \
 	float_ieee754.h gcq.h gmon.h hash.h \

nbsd_include/sys/dir.h

@@ -1,11 +0,0 @@
-/*
- * this files resolves conflicts between the file of the host system and
- * the minix specific one. This file is included directly only on Minix
- * and it is an error to do so on any other system
- */
-
-#if !defined(_MINIX) || !defined(__minix)
-#error "Including Minix specific file in program targeted for other system"
-#else
-#include <minix/dir.h>
-#endif

nbsd_include/sys/syslimits.h

@@ -26,7 +26,7 @@
 #define LINK_MAX      SHRT_MAX	/* # links a file may have */
 #define MAX_CANON          255	/* size of the canonical input queue */
 #define MAX_INPUT          255	/* size of the type-ahead buffer */
-#define NAME_MAX            60	/* # chars in a file name (actually DIRSZ) */
+#define NAME_MAX           255	/* system-wide max # chars in a file name */
 #define NGROUPS_MAX          8	/* max. number of supplemental groups */
 #define UID_MAX       SHRT_MAX  /* max value for a uid_t */
 #ifndef OPEN_MAX