Unverified Commit 043bc81e authored Feb 21, 2025 by Christian Brauner

fs: add assert for move_mount()

After we've attached a detached mount tree the anonymous mount namespace
must be empty. Add an assert and make this assumption explicit.

Link: https://lore.kernel.org/r/20250221-brauner-open_tree-v1-3-dbcfcb98c676@kernel.org

Signed-off-by: Christian Brauner <brauner@kernel.org>

parent 2f576220

fs/namespace.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -3423,11 +3423,14 @@ static int do_move_mount(struct path old_path, struct path new_path,
		out:
		unlock_mount(mp);
		if (!err) {
		if (attached)
		if (attached) {
		mntput_no_expire(parent);
		else
		} else {
		/* Make sure we notice when we leak mounts. */
		VFS_WARN_ON_ONCE(!mnt_ns_empty(ns));
		free_mnt_ns(ns);
		}
		}
		return err;
		}