webfs was truncating pages.

Reference: /n/sources/patch/applied/webfs-shortread
Date: Sun Jul 23 18:33:16 CES 2006
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/webfs/buf.c	Sun Jul 23 18:31:46 2006
+++ /sys/src/cmd/webfs/buf.c	Sun Jul 23 18:31:37 2006
@@ -30,7 +30,7 @@
 		b->rp += n;
 		return n;
 	}
-	return ioread(b->io, b->fd, buf, len);
+	return ioreadn(b->io, b->fd, buf, len);
 }
 
 void