Merge tag 'nfsd-4.16' of git://linux-nfs.org/~bfields/linux

Pull nfsd update from Bruce Fields:
 "A fairly small update this time around. Some cleanup, RDMA fixes,
  overlayfs fixes, and a fix for an NFSv4 state bug.

  The bigger deal for nfsd this time around was Jeff Layton's
  already-merged i_version patches"

* tag 'nfsd-4.16' of git://linux-nfs.org/~bfields/linux:
  svcrdma: Fix Read chunk round-up
  NFSD: hide unused svcxdr_dupstr()
  nfsd: store stat times in fill_pre_wcc() instead of inode times
  nfsd: encode stat->mtime for getattr instead of inode->i_mtime
  nfsd: return RESOURCE not GARBAGE_ARGS on too many ops
  nfsd4: don't set lock stateid's sc_type to CLOSED
  nfsd: Detect unhashed stids in nfsd4_verify_open_stid()
  sunrpc: remove dead code in svc_sock_setbufsize
  svcrdma: Post Receives in the Receive completion handler
  nfsd4: permit layoutget of executable-only files
  lockd: convert nlm_rqst.a_count from atomic_t to refcount_t
  lockd: convert nlm_lockowner.count from atomic_t to refcount_t
  lockd: convert nsm_handle.sm_count from atomic_t to refcount_t

net/sunrpc/svcsock.c

@@ -384,25 +384,11 @@ static int svc_partial_recvfrom(struct svc_rqst *rqstp,
 static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
 				unsigned int rcv)
 {
-#if 0
-	mm_segment_t	oldfs;
-	oldfs = get_fs(); set_fs(KERNEL_DS);
-	sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
-			(char*)&snd, sizeof(snd));
-	sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
-			(char*)&rcv, sizeof(rcv));
-#else
-	/* sock_setsockopt limits use to sysctl_?mem_max,
-	 * which isn't acceptable.  Until that is made conditional
-	 * on not having CAP_SYS_RESOURCE or similar, we go direct...
-	 * DaveM said I could!
-	 */
 	lock_sock(sock->sk);
 	sock->sk->sk_sndbuf = snd * 2;
 	sock->sk->sk_rcvbuf = rcv * 2;
 	sock->sk->sk_write_space(sock->sk);
 	release_sock(sock->sk);
-#endif
 }
 
 static int svc_sock_secure_port(struct svc_rqst *rqstp)

net/sunrpc/xprtrdma/svc_rdma_backchannel.c

@@ -95,7 +95,6 @@ out_shortreply:
 out_notfound:
 	dprintk("svcrdma: unrecognized bc reply: xprt=%p, xid=%08x\n",
 		xprt, be32_to_cpu(xid));
-
 	goto out_unlock;
 }
 
@@ -129,10 +128,6 @@ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
 	if (ret < 0)
 		goto out_err;
 
-	ret = svc_rdma_repost_recv(rdma, GFP_NOIO);
-	if (ret)
-		goto out_err;
-
 	/* Bump page refcnt so Send completion doesn't release
 	 * the rq_buffer before all retransmits are complete.
 	 */

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -400,10 +400,6 @@ static void svc_rdma_send_error(struct svcxprt_rdma *xprt,
 	struct page *page;
 	int ret;
 
-	ret = svc_rdma_repost_recv(xprt, GFP_KERNEL);
-	if (ret)
-		return;
-
 	page = alloc_page(GFP_KERNEL);
 	if (!page)
 		return;
@@ -554,8 +550,6 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 		ret = svc_rdma_handle_bc_reply(xprt->xpt_bc_xprt, p,
 					       &rqstp->rq_arg);
 		svc_rdma_put_context(ctxt, 0);
-		if (ret)
-			goto repost;
 		return ret;
 	}
 
@@ -590,6 +584,5 @@ out_postfail:
 
 out_drop:
 	svc_rdma_put_context(ctxt, 1);
-repost:
-	return svc_rdma_repost_recv(rdma_xprt, GFP_KERNEL);
+	return 0;
 }

net/sunrpc/xprtrdma/svc_rdma_rw.c

@@ -727,12 +727,16 @@ static int svc_rdma_build_normal_read_chunk(struct svc_rqst *rqstp,
 		head->arg.head[0].iov_len - info->ri_position;
 	head->arg.head[0].iov_len = info->ri_position;
 
-	/* Read chunk may need XDR roundup (see RFC 5666, s. 3.7).
+	/* Read chunk may need XDR roundup (see RFC 8166, s. 3.4.5.2).
 	 *
-	 * NFSv2/3 write decoders need the length of the tail to
-	 * contain the size of the roundup padding.
+	 * If the client already rounded up the chunk length, the
+	 * length does not change. Otherwise, the length of the page
+	 * list is increased to include XDR round-up.
+	 *
+	 * Currently these chunks always start at page offset 0,
+	 * thus the rounded-up length never crosses a page boundary.
 	 */
-	head->arg.tail[0].iov_len += 4 - (info->ri_chunklen & 3);
+	info->ri_chunklen = XDR_QUADLEN(info->ri_chunklen) << 2;
 
 	head->arg.page_len = info->ri_chunklen;
 	head->arg.len += info->ri_chunklen;

net/sunrpc/xprtrdma/svc_rdma_sendto.c

@@ -674,9 +674,6 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 		svc_rdma_xdr_encode_reply_chunk(rdma_resp, rp_ch, ret);
 	}
 
-	ret = svc_rdma_post_recv(rdma, GFP_KERNEL);
-	if (ret)
-		goto err1;
 	ret = svc_rdma_send_reply_msg(rdma, rdma_argp, rdma_resp, rqstp,
 				      wr_lst, rp_ch);
 	if (ret < 0)
@@ -687,9 +684,6 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
 	if (ret != -E2BIG && ret != -EINVAL)
 		goto err1;
 
-	ret = svc_rdma_post_recv(rdma, GFP_KERNEL);
-	if (ret)
-		goto err1;
 	ret = svc_rdma_send_error_msg(rdma, rdma_resp, rqstp);
 	if (ret < 0)
 		goto err0;

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -58,6 +58,7 @@
 
 #define RPCDBG_FACILITY	RPCDBG_SVCXPRT
 
+static int svc_rdma_post_recv(struct svcxprt_rdma *xprt);
 static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
 					struct net *net,
@@ -320,6 +321,8 @@ static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
 	list_add_tail(&ctxt->list, &xprt->sc_rq_dto_q);
 	spin_unlock(&xprt->sc_rq_dto_lock);
 
+	svc_rdma_post_recv(xprt);
+
 	set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
 	if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
 		goto out;
@@ -404,7 +407,8 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
 	return cma_xprt;
 }
 
-int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
+static int
+svc_rdma_post_recv(struct svcxprt_rdma *xprt)
 {
 	struct ib_recv_wr recv_wr, *bad_recv_wr;
 	struct svc_rdma_op_ctxt *ctxt;
@@ -423,7 +427,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
 			pr_err("svcrdma: Too many sges (%d)\n", sge_no);
 			goto err_put_ctxt;
 		}
-		page = alloc_page(flags);
+		page = alloc_page(GFP_KERNEL);
 		if (!page)
 			goto err_put_ctxt;
 		ctxt->pages[sge_no] = page;
@@ -459,21 +463,6 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
 	return -ENOMEM;
 }
 
-int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
-{
-	int ret = 0;
-
-	ret = svc_rdma_post_recv(xprt, flags);
-	if (ret) {
-		pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
-		       ret);
-		pr_err("svcrdma: closing transport %p.\n", xprt);
-		set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
-		ret = -ENOTCONN;
-	}
-	return ret;
-}
-
 static void
 svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt,
 			       struct rdma_conn_param *param)
@@ -833,7 +822,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 
 	/* Post receive buffers */
 	for (i = 0; i < newxprt->sc_max_requests; i++) {
-		ret = svc_rdma_post_recv(newxprt, GFP_KERNEL);
+		ret = svc_rdma_post_recv(newxprt);
 		if (ret) {
 			dprintk("svcrdma: failure posting receive buffers\n");
 			goto errout;