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>

etc/Makefile

@@ -38,7 +38,7 @@ install:: installpw	# installpw needed to bootstrap pw db
 	install -m 644 -o root -g operator descr /usr/lib/
 
 
-installforce:: $(ETC)/rc $(ETC)/rs.inet $(ETC)/rs.single $(ETC)/system.conf $(USRETC)/rc $(USR)/Makefile installpw
+installforce:: $(ETC)/rc $(ETC)/rs.inet $(ETC)/rs.single $(ETC)/system.conf $(ETC)/rc.subr.minix $(USRETC)/rc $(USR)/Makefile installpw
 
 installpw::
 	if [ ! -d $(ETC) ]; then mkdir $(ETC); chmod 755 $(ETC); fi
@@ -57,6 +57,9 @@ $(ETC)/rs.single: rs.single .PHONY
 $(ETC)/system.conf: system.conf .PHONY
 	install -m 644 -o root -g operator $> $@
 
+$(ETC)/rc.subr.minix: rc.subr.minix .PHONY
+	install -m 644 -o root -g operator $> $@
+
 $(USRETC)/rc: usr/rc .PHONY
 	install -m 755 -o root -g operator $> $@
 

etc/rc.subr.minix

@@ -2,7 +2,7 @@
 mountfstab()
 {
 	fsck_opts=""
-	fflag=""
+	fflag="-p"
 
 	while getopts "fo:" opt
 	do	case $opt
@@ -18,13 +18,6 @@ mountfstab()
 
 	shift `expr $OPTIND - 1`
 
-	# Make fsck necessary for unclean shutdown
-	msg="The system was not properly shut down.  Checking file systems."
-	if shutdown -C
-	then	echo "$msg"
-		fflag="-f"
-	fi
-
 	fstabfile="$1"
 
 	if [ ! -f $fstabfile ]
@@ -44,17 +37,16 @@ mountfstab()
 		# This line's parameters
 		dev="$1"; mp="$2"; fstype="$3"
 
+		# Don't fsck / as it's already mounted
+		if [ "$mp" = "/" ]; then continue; fi
+
 		# Sanity checks
 		if [ ! -b $dev ]; then	echo "$dev missing"; continue; fi
 		if [ ! -d $mp ]; then echo "$mp missing"; continue; fi
 
 		# Do fsck if necessary or requested
 		if [ -n "$fflag" ]
-		then	echo "Checking $fstype $dev"
-			if ! fsck.$fstype $fflag $fsck_opts -p $dev
-			then	echo "$dev fail"
-				continue
-			fi
+		then	fsck.$fstype $fflag $fsck_opts $dev
 		fi
 
 		# Skip the actual mount for /, it's already mounted