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cons: give human-friendly units for disk usage

--- a/cache.c

+++ b/cache.c

@@ -176,7 +176,8 @@

 	assert(b->ref == 0);

 	if(checkflag(b, Bcached))

 		cachedel_lk(b->bp.addr);

-	if(checkflag(b, Bcached)) print("%B cached %#p freed %#p\n", b->bp, b->cached, b->freed);

+	if(checkflag(b, Bcached))

+		print("%B cached %#p freed %#p\n", b->bp, b->cached, b->freed);

 	lrudel(b);

 	assert(!checkflag(b, Bcached));

 	b->flag = 0;

--- a/cons.c

+++ b/cons.c

@@ -161,10 +161,12 @@

 static void

 showdf(int fd, char**, int)

 {

+	char *units[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", nil};

 	vlong size, used;

+	double hsize, hused;

 	double pct;

 	Arena *a;

-	int i;

+	int i, us, uu;

 	size = 0;

 	used = 0;

@@ -175,8 +177,17 @@

 		used += a->used;

 		qunlock(a);

 	}

+	hsize = size;

+	hused = used;

+	for(us = 0; us < nelem(units)-1 && hsize >= 500 ; us++)

+		hsize /= 1024;

+	for(uu = 0; uu < nelem(units)-1 && hused >= 500 ; uu++)

+		hused /= 1024;

 	pct = 100.0*(double)used/(double)size;

-	fprint(fd, "used: %lld / %lld (%.2f%%)\n", used, size, pct);

+	fprint(fd, "fill:\t%.2f%%\n", pct);

+	fprint(fd, "used:\t%lld (%.2f %s)\n", used, hused, units[uu]);

+	fprint(fd, "avail:\t%lld (%.2f %s)\n", size, hsize, units[us]);

+

 }

 static void