code: plan9front

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kernel: use 64 bits for mountids

We dont expose this anymore, wrapping
these would be bad. Just send more bits.

--- a/sys/src/9/port/pgrp.c

+++ b/sys/src/9/port/pgrp.c

@@ -9,8 +9,19 @@

 	Whinesecs = 10,		/* frequency of out-of-resources printing */

 };

-static Ref mountid;

+uvlong

+nextmount(void)

+{

+	static uvlong next = 0;

+	static Lock lk;

+	uvlong n;

+	lock(&lk);

+	n = ++next;

+	unlock(&lk);

+	return n;

+}

+

 Pgrp*

 newpgrp(void)

 {

@@ -119,7 +130,7 @@

 	 * Allocate mount ids in the same sequence as the parent group

 	 */

 	for(m = order; m != nil; m = m->order)

-		m->mountid = incref(&mountid);

+		m->mountid = nextmount();

 	runlock(&from->ns);

 	wunlock(&to->ns);

 }

@@ -239,7 +250,7 @@

 	m = smalloc(sizeof(Mount));

 	m->to = to;

 	incref(to);

-	m->mountid = incref(&mountid);

+	m->mountid = nextmount();

 	m->mflag = flag;

 	if(spec != nil)

 		kstrdup(&m->spec, spec);

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -247,7 +247,7 @@

 struct Mount

 {

-	ulong	mountid;

+	uvlong	mountid;

 	int	mflag;

 	Mount*	next;

 	Mount*	order;