shutdown). There are still problems with device access and a PR will be
filed.
- Kill checkalias(). Allow multiple vnodes to reference a single device.
- Don't play dangerous tricks with block vnodes to ensure that only one
vnode can describe a block device. Instead, prohibit concurrent opens of
block devices. As a bonus remove the unreliable code that prevents
multiple file system mounts on the same device. It's no longer needed.
- Track opens by vnode and by device. Issue cdev_close() when the last open
goes away, instead of abusing vnode::v_usecount to tell if the device is
open.
vp->v_specinfo to get the proper st_dev and st_rdev numbers. We're
already picking over the kernel, so let's do it right. That means
also asserting the file type for the /dev/pts directory (S_IFDIR) and
nodes therein (S_IFCHR).
Remove getptsmajor(), since we no longer need it. Besides, it was
being used wrongly.
