vfs/mount/rs/service changes:

. changed umount() and mount() to call 'service', so that it can include
   a custom label, so that umount() works again (RS slot gets freed now).
   merged umount() and mount() into one file to encode keep this label
   knowledge in one file.
 . removed obsolete RS_PID field and RS_RESCUE rescue command
 . added label to RS_START struct
 . vfs no longer does kill of fs process on unmount (which was failing
   due to RS_PID request not working)
 . don't assume that if error wasn't one of three errors, that no error
   occured in vfs/request.c
mfs changes:
 . added checks to copy statements to truncate copies at buffer sizes
   (left in debug code for now)
 . added checks for null-terminatedness, if less than NAME_MAX was copied
 . added checks for copy function success
is changes: 
 . dump rs label
drivers.conf changes:
 . added acl for mfs so that mfs can be started with 'service start',
   so that a custom label can be provided

include/minix/com.h

@@ -555,7 +555,6 @@
 #define RS_DOWN		(RS_RQ_BASE + 1)	/* stop system service */
 #define RS_REFRESH	(RS_RQ_BASE + 2)	/* refresh system service */
 #define RS_RESTART	(RS_RQ_BASE + 3)	/* restart system service */
-#define RS_RESCUE	(RS_RQ_BASE + 4)	/* set rescue directory */
 #define RS_SHUTDOWN	(RS_RQ_BASE + 5)	/* alert about shutdown */
 #define RS_UP_COPY	(RS_RQ_BASE + 6)	/* start system service and
 						 * keep the binary in memory
@@ -567,7 +566,6 @@
 
 #  define RS_CMD_ADDR		m1_p1		/* command string */
 #  define RS_CMD_LEN		m1_i1		/* length of command */
-#  define RS_PID		m1_i1		/* pid of system service */
 #  define RS_PERIOD 	        m1_i2		/* heartbeat period */
 #  define RS_DEV_MAJOR          m1_i3           /* major device number */
 

include/minix/paths.h

@@ -17,5 +17,7 @@
 #define    _PATH_TMP       "/tmp"
 
 #define _PATH_BSHELL	"/bin/sh"
+#define _PATH_SERVICE	"/bin/service"
+#define _PATH_DRIVERS_CONF	"/etc/drivers.conf"
 
 #endif

include/minix/rs.h

@@ -31,6 +31,8 @@ struct rs_start
 	int rss_nr_pci_class;
 	struct { u32_t class; u32_t mask; } rss_pci_class[RSS_NR_PCI_CLASS];
 	u32_t rss_system[RSS_NR_SYSTEM];
+	char *rss_label;
+	size_t rss_labellen;
 };
 
 #define RF_COPY		0x01	/* Copy the brinary into RS to make it possible
@@ -51,3 +53,4 @@ struct rs_pci
 	int rsp_nr_class;
 	struct { u32_t class; u32_t mask; } rsp_class[RSP_NR_CLASS];
 };
+