On Fri, May 20, 2016 at 11:11:57AM -0400, Josef Bacik wrote: > On Fri, May 20, 2016 at 12:44 AM, <[email protected]> wrote: > > So fix this by taking the device_list_mutex in the readahead code. We > > can't use here the lighter approach of using a rcu_read_lock() and > > rcu_read_unlock() pair together with a list_for_each_entry_rcu() call > > because we end up doing calls to sleeping functions (kzalloc()) in the > > respective code path. > > I think it might be time to change this to a rwsem as well as we use > it in a bunch of places that are read only like statfs and readahead. > But this works for now.
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