> This uses a statically-allocated percpu variable. All > operations are local to a cpu as long that cpu operates on > the same mount, and there are no writer count imbalances. > Writer count imbalances happen when a write is taken on one > cpu, and released on another, like when an open/close pair > is performed on two different cpus because the task moved. > I'd suggest something along these lines in final mntput: lock_and_coalesce_cpu_mnt_writer_counts(); mnt_unlock_cpus(); BUG_ON(atomic_read(&mnt->__mnt_writers)); since there's basically no other we'll notice if there _is_ an imbalance. Miklos - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
