NFSD: Move callback_wq into struct nfs4_client

Commit 883820366747 ("nfsd: update workqueue creation") made the
callback_wq single-threaded, presumably to protect modifications of
cl_cb_client. See documenting comment for nfsd4_process_cb_update().

However, cl_cb_client is per-lease. There's no other reason that all
callback operations need to be dispatched via a single thread. The
single threading here means all client callbacks can be blocked by a
problem with one client.

Change the NFSv4 callback client so it serializes per-lease instead
of serializing all NFSv4 callback operations on the server.

Reported-by: Dai Ngo <[email protected]>
Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>

0 files changed, 0 insertions, 0 deletions