Clean up MFS a bit:

- Remove unused includes.
 - Add include guards to headers.
 - Use unsigned variables in case they're never going to hold a negative
   value. This causes GCC's complaints to disappear and should make flexelint
   a lot happier, too.
 - Make functions private when they're used only within a module.
 - Remove unused variables.
 - Add casts where appropriate.

include/minix/const.h

@@ -150,6 +150,7 @@
 /* Some limits. */
 #define MAX_INODE_NR ((ino_t) 037777777777)	/* largest inode number */
 #define MAX_FILE_POS ((off_t) 0x7FFFFFFF)	/* largest legal file offset */
+#define UMAX_FILE_POS ((unsigned) 0x7FFFFFF)	/* largest legal file offset */
 
 #define MAX_SYM_LOOPS	8	/* how many symbolic links are recursed */
 
@@ -158,6 +159,8 @@
 #define NO_ZONE                ((zone_t) 0)	/* absence of a zone number */
 #define NO_DEV                  ((dev_t) 0)	/* absence of a device numb */
 #define NO_LINK		      ((nlink_t) 0)	/* absence of incoming links */
+#define INVAL_UID	       ((uid_t) -1)	/* invalid uid value */
+#define INVAL_GID	       ((gid_t) -1)	/* invalid gid value */
 
 #define SERVARNAME		"cttyline"
 

include/minix/dmap.h

@@ -52,8 +52,8 @@ enum dev_style { STYLE_NDEV, STYLE_DEV, STYLE_DEVA, STYLE_TTY, STYLE_CTTY,
 #  define IS_KLOG_DEV		   0	/* minor device for /dev/klog */
 
 /* Full device numbers that are special to the boot monitor and FS. */
-#  define DEV_RAM	      0x0100	/* device number of /dev/ram */
-#  define DEV_IMGRD	      0x0106	/* device number of /dev/imgrd */
+#  define DEV_RAM     ((dev_t) 0x0100)	/* device number of /dev/ram */
+#  define DEV_IMGRD   ((dev_t) 0x0106)	/* device number of /dev/imgrd */
 
 #endif /* _DMAP_H */