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iostats: add -C flag to enable mount cache

--- a/sys/man/4/iostats

+++ b/sys/man/4/iostats

@@ -5,8 +5,9 @@

 .B iostats

 [

 .B -d

-]

-[

+] [

+.B -C

+] [

 .B -f

 .I dbfile

 ]

@@ -55,6 +56,12 @@

 .I dbfile

 (default

 .BR iostats.out ).

+.PP

+The

+.B -C

+flag sets the MCACHE flag on the mount which allows

+the kernel to cache (see 

+.IR bind(1) ).

 .SH EXAMPLE

 Display summary of file I/O incurred by

 .IR ls (1):

--- a/sys/src/cmd/iostats/iostats.c

+++ b/sys/src/cmd/iostats/iostats.c

@@ -48,8 +48,9 @@

 	char *dbfile, *s;

 	char buf[128];

 	float brpsec, bwpsec, bppsec;

-	int type, cpid, fspid, n;

+	int type, cpid, fspid, n, mflag;

+	mflag = MREPL;

 	dbfile = DEBUGFILE;

 	ARGBEGIN{

@@ -59,6 +60,9 @@

 	case 'f':

 		dbfile = ARGF();

 		break;

+	case 'C':

+		mflag |= MCACHE;

+		break;

 	default:

 		usage();

 	}ARGEND

@@ -83,7 +87,7 @@

 			fatal("no working directory");

 		rfork(RFENVG|RFNAMEG|RFNOTEG);

-		if(mount(p[0], -1, "/", MREPL, "") < 0)

+		if(mount(p[0], -1, "/", mflag, "") < 0)

 			fatal("mount /");

 		bind("#c/pid", "/dev/pid", MREPL);