don't set MNT_LOCKED on parentless mounts

don't set MNT_LOCKED on parentless mounts

Originally MNT_LOCKED meant only one thing - "don't let this mount to
be peeled off its parent, we don't want to have its mountpoint exposed".
Accordingly, it had only been set on mounts that *do* have a parent.
Later it got overloaded with another use - setting it on the absolute
root had given free protection against umount(2) of absolute root
(was possible to trigger, oopsed).  Not a bad trick, but it ended
up costing more than it bought us.  Unfortunately, the cost included
both hard-to-reason-about logics and a subtle race between
mount -o remount,ro and mount --[r]bind - lockless &= ~MNT_LOCKED in
the end of __do_loopback() could race with sb_prepare_remount_readonly()
setting and clearing MNT_HOLD_WRITE (under mount_lock, as it should
be).  The race wouldn't be much of a problem (there are other ways to
deal with it), but the subtlety is.

Turns out that nobody except umount(2) had ever made use of having
MNT_LOCKED set on absolute root.  So let's give up on that trick,
clever as it had been, add an explicit check in do_umount() and
return to using MNT_LOCKED only for mounts that have a parent.

It means that
	* clone_mnt() no longer copies MNT_LOCKED
	* copy_tree() sets it on submounts if their counterparts had
been marked such, and does that right next to attach_mnt() in there,
in the same mount_lock scope.
	* __do_loopback() no longer needs to strip MNT_LOCKED off the
root of subtree it's about to return; no store, no race.
	* init_mount_tree() doesn't bother setting MNT_LOCKED on absolute
root.
	* lock_mnt_tree() does not set MNT_LOCKED on the subtree's root;
accordingly, its caller (loop in attach_recursive_mnt()) does not need to
bother stripping that MNT_LOCKED on root.  Note that lock_mnt_tree() setting
MNT_LOCKED on submounts happens in the same mount_lock scope as __attach_mnt()
(from commit_tree()) that makes them reachable.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>