On Mon, Aug 25, 2025 at 05:43:14AM +0100, Al Viro wrote: > Currently we are taking mount_writer; what that function needs is > either mount_locked_reader (we are not changing anything, we just > want to iterate through the subtree) or namespace_shared and > a reference held by caller on the root of subtree - that's also > enough to stabilize the topology. > > The thing is, all callers are already holding at least namespace_shared > as well as a reference to the root of subtree. > > Let's make the callers provide locking warranties - don't mess with > mount_lock in check_for_nsfs_mounts() itself and document the locking > requirements. > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > --- Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
