Re: [PATCH RFC] ext4: fix potential race between online resizing and write operations

Theodore Y. Ts'o
2020-02-16T20:33:07Z

On Sun, Feb 16, 2020 at 04:12:46AM -0800, Paul E. McKenney wrote:
> > +void ext4_kvfree_array_rcu(void *to_free)
> > +{
> > + struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
> > +
> > + if (ptr) {
> > + ptr->ptr = to_free;
> > + call_rcu(&ptr->rcu, ext4_rcu_ptr_callback);
> > + return;
> > + }
> > + synchronize_rcu();
> > + kvfree(ptr);
> > +}

Whoops, that last statement should be kvfree(to_free), of course.
I'll fix that up in my tree.

- Ted