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fs: probe available memory for default cache size

--- a/main.c

+++ b/main.c

@@ -2,6 +2,7 @@

 #include <libc.h>

 #include <avl.h>

 #include <fcall.h>

+#include <bio.h>

 #include "dat.h"

 #include "fns.h"

@@ -26,6 +27,30 @@

 Blk	*blkbuf;

 void	**errctx;

+static uvlong

+memsize(void)

+{

+	char *ln, *f[2];

+	vlong mem;

+	Biobuf *bp;

+

+	mem = 512*MiB;

+	if((bp = Bopen("/dev/swap", OREAD)) == nil)

+		return mem;

+	while((ln = Brdstr(bp, '\n', 1)) != nil){

+		if(tokenize(ln, f, nelem(f)) != 2)

+			continue;

+		if(strcmp(f[1], "memory") == 0){

+			mem = strtoll(f[0], 0, 0);

+			free(ln);

+			break;

+		}

+		free(ln);

+	}

+	Bterm(bp);

+	return mem;

+}

+

 jmp_buf*

 _waserror(void)

 {

@@ -204,11 +229,14 @@

 main(int argc, char **argv)

 {

 	int i, srvfd, ctlfd, nann, check;

-	char *s, *ann[16];

+	char *s, *e, *ann[16];

+	vlong v, memsz;

 	Conn *c;

 	nann = 0;

 	check = 0;

+	memsz = memsize();

+	cachesz = 25*memsz/100;

 	ARGBEGIN{

 	case 'a':

 		if(nann == nelem(ann))

@@ -223,7 +251,20 @@

 		grow = 1;

 		break;

 	case 'm':

-		cachesz = strtoll(EARGF(usage()), nil, 0)*MiB;

+		v = strtoll(EARGF(usage()), &e, 0);

+		switch(*e){

+		case 'M': case 'm': case 0:

+			cachesz = v*MiB;

+			break;

+		case 'G': case 'g':

+			cachesz = v*GiB;

+			break;

+		case '%':

+			cachesz = v*memsz/100;

+			break;

+		default:

+			sysfatal("unknown suffix %s", e);

+		}

 		break;

 	case 'd':

 		debug++;