On Sun, Feb 04, 2024 at 02:17:34AM +0000, Al Viro wrote: > NFS ->d_revalidate(), ->permission() and ->get_link() need to access > some parts of nfs_server when called in RCU mode: > server->flags > server->caps > *(server->io_stats) > and, worst of all, call > server->nfs_client->rpc_ops->have_delegation > (the last one - as NFS_PROTO(inode)->have_delegation()). We really > don't want to RCU-delay the entire nfs_free_server() (it would have > to be done with schedule_work() from RCU callback, since it can't > be made to run from interrupt context), but actual freeing of > nfs_server and ->io_stats can be done via call_rcu() just fine. > nfs_client part is handled simply by making nfs_free_client() use > kfree_rcu(). > > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > --- Acked-by: Christian Brauner <brauner@xxxxxxxxxx>
