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avoid updating offset in pread; avoid diagnostic about vlong mask (charles forsyth)

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

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

@@ -677,10 +677,12 @@

 	}else

 		nnn = nn = devtab[c->type]->read(c, p, n, off);

-	lock(c);

-	c->devoffset += nn;

-	c->offset += nnn;

-	unlock(c);

+	if((c->qid.type & QTDIR) || offp == nil){

+		lock(c);

+		c->devoffset += nn;

+		c->offset += nnn;

+		unlock(c);

+	}

 	poperror();

 	cclose(c);

@@ -1278,7 +1280,7 @@

 	p += 28;

 	strncpy((char*)p, d->gid, 28);

 	p += 28;

-	q = d->qid.path & ~DMDIR;	/* make sure doesn't accidentally look like directory */

+	q = (ulong)d->qid.path & ~DMDIR;	/* make sure doesn't accidentally look like directory */

 	if(d->qid.type & QTDIR)	/* this is the real test of a new directory */

 		q |= DMDIR;

 	PBIT32(p, q);

-- 

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