Merge tag 'nfsd-4.12' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "Another RDMA update from Chuck Lever, and a bunch of miscellaneous
  bugfixes"

* tag 'nfsd-4.12' of git://linux-nfs.org/~bfields/linux: (26 commits)
  nfsd: Fix up the "supattr_exclcreat" attributes
  nfsd: encoders mustn't use unitialized values in error cases
  nfsd: fix undefined behavior in nfsd4_layout_verify
  lockd: fix lockd shutdown race
  NFSv4: Fix callback server shutdown
  SUNRPC: Refactor svc_set_num_threads()
  NFSv4.x/callback: Create the callback service through svc_create_pooled
  lockd: remove redundant check on block
  svcrdma: Clean out old XDR encoders
  svcrdma: Remove the req_map cache
  svcrdma: Remove unused RDMA Write completion handler
  svcrdma: Reduce size of sge array in struct svc_rdma_op_ctxt
  svcrdma: Clean up RPC-over-RDMA backchannel reply processing
  svcrdma: Report Write/Reply chunk overruns
  svcrdma: Clean up RDMA_ERROR path
  svcrdma: Use rdma_rw API in RPC reply path
  svcrdma: Introduce local rdma_rw API helpers
  svcrdma: Clean up svc_rdma_get_inv_rkey()
  svcrdma: Add helper to save pages under I/O
  svcrdma: Eliminate RPCRDMA_SQ_DEPTH_MULT
  ...
nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
			      struct list_head *collect,
			      void (*func)(struct nfs4_openowner *))
{
	struct nfs4_openowner *oop, *next;
	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
						nfsd_net_id);
	u64 count = 0;

	lockdep_assert_held(&nn->client_lock);

	spin_lock(&clp->cl_lock);
	list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
		if (func) {
			func(oop);
			if (collect) {
				atomic_inc(&clp->cl_refcount);
				list_add(&oop->oo_perclient, collect);
			}
		}
		++count;
		/*
		 * Despite the fact that these functions deal with
		 * 64-bit integers for "count", we must ensure that
		 * it doesn't blow up the clp->cl_refcount. Throw a
		 * warning if we start to approach INT_MAX here.
		 */
		WARN_ON_ONCE(count == (INT_MAX / 2));
		if (count == max)
			break;
	}
	spin_unlock(&clp->cl_lock);

	return count;
}

nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
			      struct list_head *collect,
			      void (*func)(struct nfs4_openowner *))
{
	struct nfs4_openowner *oop, *next;
	struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
						nfsd_net_id);
	u64 count = 0;

	lockdep_assert_held(&nn->client_lock);

	spin_lock(&clp->cl_lock);
	list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
		if (func) {
			func(oop);
			if (collect) {
				atomic_inc(&clp->cl_refcount);
				list_add(&oop->oo_perclient, collect);
			}
		}
		++count;
		/*
		 * Despite the fact that these functions deal with
		 * 64-bit integers for "count", we must ensure that
		 * it doesn't blow up the clp->cl_refcount. Throw a
		 * warning if we start to approach INT_MAX here.
		 */
		WARN_ON_ONCE(count == (INT_MAX / 2));
		if (count == max)
			break;
	}
	spin_unlock(&clp->cl_lock);

	return count;
}
