On Wed, Dec 11, 2024 at 12:24:03PM +0100, Christian Brauner wrote: > On Wed, Dec 11, 2024 at 11:55:37AM +0100, Miklos Szeredi wrote: > > On Wed, 11 Dec 2024 at 11:34, Christian Brauner <brauner@xxxxxxxxxx> wrote: > > > > > For that the caller has to exit or switch to another mount namespace. > > > But that can only happen when all notifications have been registered. > > > I may misunderstand what you mean though. > > > > Ah, umount can only be done by a task that is in the namespace of the > > mount. I cannot find a hole in that logic, but it does seem rather > > Currently... I have a finished patch series that allows unmounting by > mount id including support for unmounting mounts in other namespaces > without requiring setns(). That's sitting in my tree since v6.11-rc1. I > should get that out. https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git work.umount_by_id fwiw
