From d7bc9602196156d6ea438130405bff7e216e82f5 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 15 Jun 1991 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1991-06-15

---
 port/devroot.c | 40 ++++++++++++++++++++++++++++++----------
 port/devwren.c |  2 +-
 port/sysfile.c | 18 ++++--------------
 3 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/port/devroot.c b/port/devroot.c
index 862b1227fcafffc4a3909158d9f5e2edfdbaa72e..07d9f1a3a26c3c558eb8fbb24108f68f47fbdaf4 100644
--- a/port/devroot.c
+++ b/port/devroot.c
@@ -19,28 +19,48 @@ enum{
 
 extern long	cfslen;
 extern ulong	cfscode[];
-
 extern long	cryptfslen;
 extern ulong	cryptfscode[];
 
-
 Dirtab rootdir[]={
 	"bin",		{Qbin|CHDIR},	0,			0700,
 	"boot",		{Qboot},	0,			0700,
 	"dev",		{Qdev|CHDIR},	0,			0700,
 	"env",		{Qenv|CHDIR},	0,			0700,
 	"proc",		{Qproc|CHDIR},	0,			0700,
-	"cryptfs",	{Qcryptfs},	0,			0700,
-	"cfs",		{Qcfs},		0,			0700,
 };
-
 #define	NROOT	(sizeof rootdir/sizeof(Dirtab))
+Dirtab rootpdir[]={
+	"cfs",		{Qcfs},		0,			0700,
+	"cryptfs",	{Qcryptfs},	0,			0700,
+};
+Dirtab *rootmap[sizeof rootpdir/sizeof(Dirtab)];
 int	nroot;
 
+int
+rootgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp)
+{
+	if(tab==0 || i>=ntab)
+		return -1;
+	if(i < NROOT)
+		tab += i;
+	else
+		tab = rootmap[i - NROOT];
+	devdir(c, tab->qid, tab->name, tab->length, tab->perm, dp);
+	return 1;
+}
+
 void
 rootreset(void)
 {
-	nroot = (cfslen > 0) ? NROOT : NROOT-1;
+	int i;
+
+	i = 0;
+	if(cfslen)
+		rootmap[i++] = &rootpdir[0];
+	if(cryptfslen)
+		rootmap[i++] = &rootpdir[1];
+	nroot = NROOT + i;
 }
 
 void
@@ -63,19 +83,19 @@ rootclone(Chan *c, Chan *nc)
 int	 
 rootwalk(Chan *c, char *name)
 {
-	return devwalk(c, name, rootdir, nroot, devgen);
+	return devwalk(c, name, rootdir, nroot, rootgen);
 }
 
 void	 
 rootstat(Chan *c, char *dp)
 {
-	devstat(c, dp, rootdir, nroot, devgen);
+	devstat(c, dp, rootdir, nroot, rootgen);
 }
 
 Chan*
 rootopen(Chan *c, int omode)
 {
-	return devopen(c, omode, rootdir, nroot, devgen);
+	return devopen(c, omode, rootdir, nroot, rootgen);
 }
 
 void	 
@@ -100,7 +120,7 @@ rootread(Chan *c, void *buf, long n, ulong offset)
 
 	switch(c->qid.path & ~CHDIR){
 	case Qdir:
-		return devdirread(c, buf, n, rootdir, nroot, devgen);
+		return devdirread(c, buf, n, rootdir, nroot, rootgen);
 
 	case Qboot:		/* boot */
 		if(offset >= sizeof bootcode)
diff --git a/port/devwren.c b/port/devwren.c
index b0937a0f9c91c30fa3577576362fd7fd82cf9ccb..c313cf352f4b6f912f93a3e761375758229804d0 100644
--- a/port/devwren.c
+++ b/port/devwren.c
@@ -150,7 +150,7 @@ wrenattach(char *param)
 	d = &wren[dev];
 	d->blocksize = BGLONG(&buf[4]);
 
-	plen = BGLONG(&buf[0]);
+	plen = BGLONG(&buf[0])+1;
 	d->p[Npart].firstblock = 0;
 	d->p[Npart].maxblock = plen;
 	plen = plen/Npart;
diff --git a/port/sysfile.c b/port/sysfile.c
index 63bfe099918a9ef28a7e8625a4ac3e8ffbfe9b7f..d2d95290e3a91d7a764905d9ea7d81f5c8ecba8c 100644
--- a/port/sysfile.c
+++ b/port/sysfile.c
@@ -364,8 +364,6 @@ bindmount(ulong *arg, int ismount)
 	Chan *c0, *c1;
 	ulong flag;
 	long ret;
-	char *p;
-	int t;
 	struct{
 		Chan	*chan;
 		char	*spec;
@@ -378,20 +376,12 @@ bindmount(ulong *arg, int ismount)
 	if(ismount){
 		bogus.chan = fdtochan(arg[0], 2);
 		validaddr(arg[3], 1, 0);
-		p = (char*)arg[3];
-		t = BY2PG-((ulong)p&(BY2PG-1));
-		while(vmemchr(p, 0, t) == 0){
-			p += t;
-			t = BY2PG;
-		}
+		if(vmemchr((char*)arg[3], '\0', NAMELEN) == 0)
+			error(Ebadarg);
 		bogus.spec = (char*)arg[3];
 		validaddr(arg[4], 1, 0);
-		p = (char*)arg[4];
-		t = BY2PG-((ulong)p&(BY2PG-1));
-		while(vmemchr(p, 0, t) == 0){
-			p += t;
-			t = BY2PG;
-		}
+		if(vmemchr((char*)arg[4], '\0', NAMELEN) == 0)
+			error(Ebadarg);
 		bogus.auth = (char*)arg[4];
 		ret = devno('M', 0);
 		c0 = (*devtab[ret].attach)((char*)&bogus);