mfs: clean flag

. also implement now-possible fsck -p option
    	. allows unconditional fsck -p invocation at startup,
    	  only checking each filesystem if not marked clean
    	. mounting unclean is allowed but is forced readonly
    	. updating the superblock while mounted is now not
    	  allowed by mfs - must be done (e.g. by fsck.mfs)
    	  on an unmounted fs
	. clean flag is unset by mfs on mounting, and set by
	  mfs on clean unmounting (if clean flag was set at
	  mount time)

Signed-off-by: Ben Gras <ben@minix3.org>

drivers/ramdisk/Makefile

@@ -3,7 +3,7 @@
 .include <bsd.own.mk>
 
 PROGRAMS= at_wini bios_wini cdprobe dev2name floppy loadramdisk mount \
-	pci procfs sh service sysenv mfs
+	pci procfs sh service sysenv mfs fsck.mfs
 SCRIPTS=newroot
 
 .if ${MKSMALL} != "yes"
@@ -43,6 +43,11 @@ bintoc:	bintoc.c
 
 image:	proto.gen mtab rc $(EXTRA)
 	mkfs.mfs image proto.gen || { rm -f image; false; }
+	if fsck.mfs -s image | grep -q CLEAN;	\
+	then	: ;	\
+	else	echo "CLEAN sanity check of image failed."	;	\
+		echo "(Perhaps install current mkfs and fsck.)" ;	\
+	fi
 
 ahci: ../ahci/ahci
 	install ${STRIPFLAG} ../$@/$@ $@
@@ -104,6 +109,12 @@ mount:  ../../commands/mount/mount
 ../../commands/mount/mount:
 	$(MAKE) -C ../../commands/mount
 
+fsck.mfs:  ../../commands/fsck.mfs/fsck.mfs
+	install ${STRIPFLAG} ../../commands/$@/$@ $@
+
+../../commands/fsck.mfs/fsck.mfs:
+	$(MAKE) -C ../../commands/fsck.mfs
+
 newroot:  ../../commands/newroot/newroot.sh
 	install ${STRIPFLAG} ../../commands/$@/$@.sh $@
 

drivers/ramdisk/proto

@@ -10,6 +10,7 @@ d--755 0 0
 		sh ---755 0 0 sh
 		service ---755 0 0 service
 		sysenv ---755 0 0 sysenv
+		fsck.mfs ---755 0 0 fsck.mfs
 	$
 	sbin d--755 0 0
 		@ACPI@

drivers/ramdisk/rc

@@ -5,6 +5,7 @@ exec >/dev/log
 exec 2>/dev/log
 exec </dev/null
 
+FSCK=/bin/fsck.mfs
 ACPI=/sbin/acpi
 if [ -e $ACPI -a -n "`sysenv acpi`" ]
 then
@@ -56,6 +57,10 @@ then
 	loadramdisk "$ramimagename"
 fi
 echo "Root device name is $rootdevname"
+if [ -e $FSCK ]
+then	$FSCK -p $rootdevname
+fi
 /bin/newroot $bin_img"$rootdevname"
 /bin/mount -e -t procfs none /proc || echo "WARNING: couldn't mount procfs"
+
 exec /bin/sh /etc/rc "$@"