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devfs-posix: use stat->st_dev<<32 | stat->st_ino for qid.path

--- a/kern/devfs-posix.c

+++ b/kern/devfs-posix.c

@@ -40,7 +40,7 @@

 char	*base = "/";

-static	Qid	fsqid(char*, struct stat *);

+static	Qid	fsqid(struct stat *);

 static	void	fspath(Chan*, char*, char*);

 static	ulong	fsdirread(Chan*, uchar*, int, ulong);

 static	int	fsomode(int);

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

 	uif->uid = stbuf.st_uid;

 	uif->gid = stbuf.st_gid;

-	c->qid = fsqid(path, &stbuf);

+	c->qid = fsqid(&stbuf);

 	return 1;

 }

@@ -302,7 +302,7 @@

 	if(stat(path, &stbuf) < 0)

 		error(strerror(errno));

-	c->qid = fsqid(path, &stbuf);

+	c->qid = fsqid(&stbuf);

 	c->offset = 0;

 	c->flag |= COPEN;

 	c->mode = openmode(mode);

@@ -458,31 +458,15 @@

 }

 static Qid

-fsqid(char *p, struct stat *st)

+fsqid(struct stat *st)

 {

 	Qid q;

-	int dev;

-	ulong h;

-	static int nqdev;

-	static uchar *qdev;

-	if(qdev == 0)

-		qdev = mallocz(65536U, 1);

-

 	q.type = 0;

 	if((st->st_mode&S_IFMT) ==  S_IFDIR)

 		q.type = QTDIR;

-	dev = st->st_dev & 0xFFFFUL;

-	if(qdev[dev] == 0)

-		qdev[dev] = ++nqdev;

-

-	h = 0;

-	while(*p != '\0')

-		h += *p++ * 13;

-	

-	q.path = (vlong)qdev[dev]<<32;

-	q.path |= h;

+	q.path = (uvlong)st->st_dev<<32 | st->st_ino;

 	q.vers = st->st_mtime;

 	return q;

@@ -579,7 +563,7 @@

 		d.uid = "unknown";

 		d.gid = "unknown";

 		d.muid = "unknown";

-		d.qid = fsqid(path, &stbuf);

+		d.qid = fsqid(&stbuf);

 		d.mode = (d.qid.type<<24)|(stbuf.st_mode&0777);

 		d.atime = stbuf.st_atime;

 		d.mtime = stbuf.st_mtime;