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hjfs: statw command

--- a/sys/src/cmd/hjfs/cons.c

+++ b/sys/src/cmd/hjfs/cons.c

@@ -166,6 +166,36 @@

 	return 1;

 }

+int

+cmdstatw(int, char **)

+{

+	uvlong n;

+	uvlong i;

+	int j;

+	Buf *b, *sb;

+

+	wlock(fsmain);

+	sb = getbuf(fsmain->d, SUPERBLK, TSUPERBLOCK, 0);

+	if(sb == nil){

+		wunlock(fsmain);

+		return -1;

+	}

+	n = 0;

+	for(i = sb->sb.fstart; i < sb->sb.fend; i++){

+		b = getbuf(fsmain->d, i, TREF, 0);

+		if(b == nil)

+			continue;

+		for(j = 0; j < REFPERBLK; j++)

+			if(b->refs[j] == 0)

+				n++;

+		putbuf(b);

+	}

+	dprint("hjfs: free %uld, used %uld, total %uld\n", n, sb->sb.size, sb->sb.size - n);

+	putbuf(sb);

+	wunlock(fsmain);

+	return 1;

+}

+

 extern int cmdnewuser(int, char **);

 Cmd cmds[] = {

@@ -178,6 +208,7 @@

 	{"halt", 1, cmdhalt},

 	{"newuser", 0, cmdnewuser},

 	{"echo", 2, cmdecho},

+	{"statw", 1, cmdstatw},

 };

-- 

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