Merge tag 'nfsd-5.14' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:

 - add tracepoints for callbacks and for client creation and destruction

 - cache the mounts used for server-to-server copies

 - expose callback information in /proc/fs/nfsd/clients/*/info

 - don't hold locks unnecessarily while waiting for commits

 - update NLM to use xdr_stream, as we have for NFSv2/v3/v4

* tag 'nfsd-5.14' of git://linux-nfs.org/~bfields/linux: (69 commits)
  nfsd: fix NULL dereference in nfs3svc_encode_getaclres
  NFSD: Prevent a possible oops in the nfs_dirent() tracepoint
  nfsd: remove redundant assignment to pointer 'this'
  nfsd: Reduce contention for the nfsd_file nf_rwsem
  lockd: Update the NLMv4 SHARE results encoder to use struct xdr_stream
  lockd: Update the NLMv4 nlm_res results encoder to use struct xdr_stream
  lockd: Update the NLMv4 TEST results encoder to use struct xdr_stream
  lockd: Update the NLMv4 void results encoder to use struct xdr_stream
  lockd: Update the NLMv4 FREE_ALL arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 SHARE arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 SM_NOTIFY arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 nlm_res arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 UNLOCK arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 CANCEL arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 LOCK arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 TEST arguments decoder to use struct xdr_stream
  lockd: Update the NLMv4 void arguments decoder to use struct xdr_stream
  lockd: Update the NLMv1 SHARE results encoder to use struct xdr_stream
  lockd: Update the NLMv1 nlm_res results encoder to use struct xdr_stream
  lockd: Update the NLMv1 TEST results encoder to use struct xdr_stream
  ...

11 files changed, 546 insertions, 132 deletions

diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index a75abeb1e698..935c1028c217 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -176,6 +176,12 @@ struct nfsd_net {
 	unsigned int             longest_chain_cachesize;
 
 	struct shrinker		nfsd_reply_cache_shrinker;
+
+	/* tracking server-to-server copy mounts */
+	spinlock_t              nfsd_ssc_lock;
+	struct list_head        nfsd_ssc_mount_list;
+	wait_queue_head_t       nfsd_ssc_waitq;
+
 	/* utsname taken from the process that starts the server */
 	char			nfsd_name[UNX_MAXNODENAME+1];
 };
diff --git a/fs/nfsd/nfs3acl.c b/fs/nfsd/nfs3acl.c
index a1591feeea22..5dfe7644a517 100644
--- a/fs/nfsd/nfs3acl.c
+++ b/fs/nfsd/nfs3acl.c
@@ -172,7 +172,7 @@ static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
 	struct nfsd3_getaclres *resp = rqstp->rq_resp;
 	struct dentry *dentry = resp->fh.fh_dentry;
 	struct kvec *head = rqstp->rq_res.head;
-	struct inode *inode = d_inode(dentry);
+	struct inode *inode;
 	unsigned int base;
 	int n;
 	int w;
@@ -181,6 +181,7 @@ static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
 		return 0;
 	switch (resp->status) {
 	case nfs_ok:
+		inode = d_inode(dentry);
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 			return 0;
 		if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 7325592b456e..0f8b10f363e7 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -915,10 +915,8 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
 		args.authflavor = clp->cl_cred.cr_flavor;
 		clp->cl_cb_ident = conn->cb_ident;
 	} else {
-		if (!conn->cb_xprt) {
-			trace_nfsd_cb_setup_err(clp, -EINVAL);
+		if (!conn->cb_xprt)
 			return -EINVAL;
-		}
 		clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
 		clp->cl_cb_session = ses;
 		args.bc_xprt = conn->cb_xprt;
@@ -941,37 +939,43 @@ static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *c
 	}
 	clp->cl_cb_client = client;
 	clp->cl_cb_cred = cred;
-	trace_nfsd_cb_setup(clp);
+	rcu_read_lock();
+	trace_nfsd_cb_setup(clp, rpc_peeraddr2str(client, RPC_DISPLAY_NETID),
+			    args.authflavor);
+	rcu_read_unlock();
 	return 0;
 }
 
+static void nfsd4_mark_cb_state(struct nfs4_client *clp, int newstate)
+{
+	if (clp->cl_cb_state != newstate) {
+		clp->cl_cb_state = newstate;
+		trace_nfsd_cb_state(clp);
+	}
+}
+
 static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
 {
 	if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
 		return;
-	clp->cl_cb_state = NFSD4_CB_DOWN;
-	trace_nfsd_cb_state(clp);
+	nfsd4_mark_cb_state(clp, NFSD4_CB_DOWN);
 }
 
 static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
 {
 	if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
 		return;
-	clp->cl_cb_state = NFSD4_CB_FAULT;
-	trace_nfsd_cb_state(clp);
+	nfsd4_mark_cb_state(clp, NFSD4_CB_FAULT);
 }
 
 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
 {
 	struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
 
-	trace_nfsd_cb_done(clp, task->tk_status);
 	if (task->tk_status)
 		nfsd4_mark_cb_down(clp, task->tk_status);
-	else {
-		clp->cl_cb_state = NFSD4_CB_UP;
-		trace_nfsd_cb_state(clp);
-	}
+	else
+		nfsd4_mark_cb_state(clp, NFSD4_CB_UP);
 }
 
 static void nfsd4_cb_probe_release(void *calldata)
@@ -995,8 +999,8 @@ static const struct rpc_call_ops nfsd4_cb_probe_ops = {
  */
 void nfsd4_probe_callback(struct nfs4_client *clp)
 {
-	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
-	trace_nfsd_cb_state(clp);
+	trace_nfsd_cb_probe(clp);
+	nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN);
 	set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
 	nfsd4_run_cb(&clp->cl_cb_null);
 }
@@ -1009,11 +1013,10 @@ void nfsd4_probe_callback_sync(struct nfs4_client *clp)
 
 void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
 {
-	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
+	nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN);
 	spin_lock(&clp->cl_lock);
 	memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
 	spin_unlock(&clp->cl_lock);
-	trace_nfsd_cb_state(clp);
 }
 
 /*
@@ -1170,8 +1173,6 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
 	struct nfsd4_callback *cb = calldata;
 	struct nfs4_client *clp = cb->cb_clp;
 
-	trace_nfsd_cb_done(clp, task->tk_status);
-
 	if (!nfsd4_cb_sequence_done(task, cb))
 		return;
 
@@ -1231,6 +1232,9 @@ void nfsd4_destroy_callback_queue(void)
 /* must be called under the state lock */
 void nfsd4_shutdown_callback(struct nfs4_client *clp)
 {
+	if (clp->cl_cb_state != NFSD4_CB_UNKNOWN)
+		trace_nfsd_cb_shutdown(clp);
+
 	set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
 	/*
 	 * Note this won't actually result in a null callback;
@@ -1276,7 +1280,6 @@ static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
 	 * kill the old client:
 	 */
 	if (clp->cl_cb_client) {
-		trace_nfsd_cb_shutdown(clp);
 		rpc_shutdown_client(clp->cl_cb_client);
 		clp->cl_cb_client = NULL;
 		put_cred(clp->cl_cb_cred);
@@ -1322,8 +1325,6 @@ nfsd4_run_cb_work(struct work_struct *work)
 	struct rpc_clnt *clnt;
 	int flags;
 
-	trace_nfsd_cb_work(clp, cb->cb_msg.rpc_proc->p_name);
-
 	if (cb->cb_need_restart) {
 		cb->cb_need_restart = false;
 	} else {
@@ -1345,7 +1346,7 @@ nfsd4_run_cb_work(struct work_struct *work)
 	 * Don't send probe messages for 4.1 or later.
 	 */
 	if (!cb->cb_ops && clp->cl_minorversion) {
-		clp->cl_cb_state = NFSD4_CB_UP;
+		nfsd4_mark_cb_state(clp, NFSD4_CB_UP);
 		nfsd41_destroy_cb(cb);
 		return;
 	}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f4ce93d7f26e..486c5dba4b65 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -55,6 +55,13 @@ module_param(inter_copy_offload_enable, bool, 0644);
 MODULE_PARM_DESC(inter_copy_offload_enable,
 		 "Enable inter server to server copy offload. Default: false");
 
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+static int nfsd4_ssc_umount_timeout = 900000;		/* default to 15 mins */
+module_param(nfsd4_ssc_umount_timeout, int, 0644);
+MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
+		"idle msecs before unmount export from source server");
+#endif
+
 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 #include <linux/security.h>
 
@@ -1166,6 +1173,81 @@ extern void nfs_sb_deactive(struct super_block *sb);
 #define NFSD42_INTERSSC_MOUNTOPS "vers=4.2,addr=%s,sec=sys"
 
 /*
+ * setup a work entry in the ssc delayed unmount list.
+ */
+static __be32 nfsd4_ssc_setup_dul(struct nfsd_net *nn, char *ipaddr,
+		struct nfsd4_ssc_umount_item **retwork, struct vfsmount **ss_mnt)
+{
+	struct nfsd4_ssc_umount_item *ni = 0;
+	struct nfsd4_ssc_umount_item *work = NULL;
+	struct nfsd4_ssc_umount_item *tmp;
+	DEFINE_WAIT(wait);
+
+	*ss_mnt = NULL;
+	*retwork = NULL;
+	work = kzalloc(sizeof(*work), GFP_KERNEL);
+try_again:
+	spin_lock(&nn->nfsd_ssc_lock);
+	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
+		if (strncmp(ni->nsui_ipaddr, ipaddr, sizeof(ni->nsui_ipaddr)))
+			continue;
+		/* found a match */
+		if (ni->nsui_busy) {
+			/*  wait - and try again */
+			prepare_to_wait(&nn->nfsd_ssc_waitq, &wait,
+				TASK_INTERRUPTIBLE);
+			spin_unlock(&nn->nfsd_ssc_lock);
+
+			/* allow 20secs for mount/unmount for now - revisit */
+			if (signal_pending(current) ||
+					(schedule_timeout(20*HZ) == 0)) {
+				kfree(work);
+				return nfserr_eagain;
+			}
+			finish_wait(&nn->nfsd_ssc_waitq, &wait);
+			goto try_again;
+		}
+		*ss_mnt = ni->nsui_vfsmount;
+		refcount_inc(&ni->nsui_refcnt);
+		spin_unlock(&nn->nfsd_ssc_lock);
+		kfree(work);
+
+		/* return vfsmount in ss_mnt */
+		return 0;
+	}
+	if (work) {
+		strncpy(work->nsui_ipaddr, ipaddr, sizeof(work->nsui_ipaddr));
+		refcount_set(&work->nsui_refcnt, 2);
+		work->nsui_busy = true;
+		list_add_tail(&work->nsui_list, &nn->nfsd_ssc_mount_list);
+		*retwork = work;
+	}
+	spin_unlock(&nn->nfsd_ssc_lock);
+	return 0;
+}
+
+static void nfsd4_ssc_update_dul_work(struct nfsd_net *nn,
+		struct nfsd4_ssc_umount_item *work, struct vfsmount *ss_mnt)
+{
+	/* set nsui_vfsmount, clear busy flag and wakeup waiters */
+	spin_lock(&nn->nfsd_ssc_lock);
+	work->nsui_vfsmount = ss_mnt;
+	work->nsui_busy = false;
+	wake_up_all(&nn->nfsd_ssc_waitq);
+	spin_unlock(&nn->nfsd_ssc_lock);
+}
+
+static void nfsd4_ssc_cancel_dul_work(struct nfsd_net *nn,
+		struct nfsd4_ssc_umount_item *work)
+{
+	spin_lock(&nn->nfsd_ssc_lock);
+	list_del(&work->nsui_list);
+	wake_up_all(&nn->nfsd_ssc_waitq);
+	spin_unlock(&nn->nfsd_ssc_lock);
+	kfree(work);
+}
+
+/*
  * Support one copy source server for now.
  */
 static __be32
@@ -1181,6 +1263,8 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
 	char *ipaddr, *dev_name, *raw_data;
 	int len, raw_len;
 	__be32 status = nfserr_inval;
+	struct nfsd4_ssc_umount_item *work = NULL;
+	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 
 	naddr = &nss->u.nl4_addr;
 	tmp_addrlen = rpc_uaddr2sockaddr(SVC_NET(rqstp), naddr->addr,
@@ -1229,12 +1313,24 @@ nfsd4_interssc_connect(struct nl4_server *nss, struct svc_rqst *rqstp,
 		goto out_free_rawdata;
 	snprintf(dev_name, len + 5, "%s%s%s:/", startsep, ipaddr, endsep);
 
+	status = nfsd4_ssc_setup_dul(nn, ipaddr, &work, &ss_mnt);
+	if (status)
+		goto out_free_devname;
+	if (ss_mnt)
+		goto out_done;
+
 	/* Use an 'internal' mount: SB_KERNMOUNT -> MNT_INTERNAL */
 	ss_mnt = vfs_kern_mount(type, SB_KERNMOUNT, dev_name, raw_data);
 	module_put(type->owner);
-	if (IS_ERR(ss_mnt))
+	if (IS_ERR(ss_mnt)) {
+		status = nfserr_nodev;
+		if (work)
+			nfsd4_ssc_cancel_dul_work(nn, work);
 		goto out_free_devname;
-
+	}
+	if (work)
+		nfsd4_ssc_update_dul_work(nn, work, ss_mnt);
+out_done:
 	status = 0;
 	*mount = ss_mnt;
 
@@ -1301,10 +1397,42 @@ static void
 nfsd4_cleanup_inter_ssc(struct vfsmount *ss_mnt, struct nfsd_file *src,
 			struct nfsd_file *dst)
 {
+	bool found = false;
+	long timeout;
+	struct nfsd4_ssc_umount_item *tmp;
+	struct nfsd4_ssc_umount_item *ni = NULL;
+	struct nfsd_net *nn = net_generic(dst->nf_net, nfsd_net_id);
+
 	nfs42_ssc_close(src->nf_file);
-	fput(src->nf_file);
 	nfsd_file_put(dst);
-	mntput(ss_mnt);
+	fput(src->nf_file);
+
+	if (!nn) {
+		mntput(ss_mnt);
+		return;
+	}
+	spin_lock(&nn->nfsd_ssc_lock);
+	timeout = msecs_to_jiffies(nfsd4_ssc_umount_timeout);
+	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
+		if (ni->nsui_vfsmount->mnt_sb == ss_mnt->mnt_sb) {
+			list_del(&ni->nsui_list);
+			/*
+			 * vfsmount can be shared by multiple exports,
+			 * decrement refcnt. If the count drops to 1 it
+			 * will be unmounted when nsui_expire expires.
+			 */
+			refcount_dec(&ni->nsui_refcnt);
+			ni->nsui_expire = jiffies + timeout;
+			list_add_tail(&ni->nsui_list, &nn->nfsd_ssc_mount_list);
+			found = true;
+			break;
+		}
+	}
+	spin_unlock(&nn->nfsd_ssc_lock);
+	if (!found) {
+		mntput(ss_mnt);
+		return;
+	}
 }
 
 #else /* CONFIG_NFSD_V4_2_INTER_SSC */
@@ -1375,7 +1503,8 @@ static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = {
 
 static void nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync)
 {
-	copy->cp_res.wr_stable_how = NFS_UNSTABLE;
+	copy->cp_res.wr_stable_how =
+		copy->committed ? NFS_FILE_SYNC : NFS_UNSTABLE;
 	copy->cp_synchronous = sync;
 	gen_boot_verifier(&copy->cp_res.wr_verifier, copy->cp_clp->net);
 }
@@ -1386,6 +1515,7 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
 	u64 bytes_total = copy->cp_count;
 	u64 src_pos = copy->cp_src_pos;
 	u64 dst_pos = copy->cp_dst_pos;
+	__be32 status;
 
 	/* See RFC 7862 p.67: */
 	if (bytes_total == 0)
@@ -1403,6 +1533,16 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_copy *copy)
 		src_pos += bytes_copied;
 		dst_pos += bytes_copied;
 	} while (bytes_total > 0 && !copy->cp_synchronous);
+	/* for a non-zero asynchronous copy do a commit of data */
+	if (!copy->cp_synchronous && copy->cp_res.wr_bytes_written > 0) {
+		down_write(&copy->nf_dst->nf_rwsem);
+		status = vfs_fsync_range(copy->nf_dst->nf_file,
+					 copy->cp_dst_pos,
+					 copy->cp_res.wr_bytes_written, 0);
+		up_write(&copy->nf_dst->nf_rwsem);
+		if (!status)
+			copy->committed = true;
+	}
 	return bytes_copied;
 }
 
@@ -1497,6 +1637,8 @@ do_callback:
 	memcpy(&cb_copy->fh, &copy->fh, sizeof(copy->fh));
 	nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp,
 			&nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD);
+	trace_nfsd_cb_offload(copy->cp_clp, &copy->cp_res.cb_stateid,
+			      &copy->fh, copy->cp_count, copy->nfserr);
 	nfsd4_run_cb(&cb_copy->cp_cb);
 out:
 	if (!copy->cp_intra)
@@ -3232,7 +3374,7 @@ bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
 {
 	struct nfsd4_compoundres *resp = rqstp->rq_resp;
 	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
-	struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
+	struct nfsd4_op *this;
 	struct nfsd4_compound_state *cstate = &resp->cstate;
 	struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
 	u32 opiter;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index cd5eac2ba054..fa67ecd5fe63 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -44,6 +44,7 @@
 #include <linux/jhash.h>
 #include <linux/string_helpers.h>
 #include <linux/fsnotify.h>
+#include <linux/nfs_ssc.h>
 #include "xdr4.h"
 #include "xdr4cb.h"
 #include "vfs.h"
@@ -1745,6 +1746,8 @@ static void nfsd4_conn_lost(struct svc_xpt_user *u)
 	struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
 	struct nfs4_client *clp = c->cn_session->se_client;
 
+	trace_nfsd_cb_lost(clp);
+
 	spin_lock(&clp->cl_lock);
 	if (!list_empty(&c->cn_persession)) {
 		list_del(&c->cn_persession);
@@ -2355,6 +2358,21 @@ static void seq_quote_mem(struct seq_file *m, char *data, int len)
 	seq_printf(m, "\"");
 }
 
+static const char *cb_state2str(int state)
+{
+	switch (state) {
+	case NFSD4_CB_UP:
+		return "UP";
+	case NFSD4_CB_UNKNOWN:
+		return "UNKNOWN";
+	case NFSD4_CB_DOWN:
+		return "DOWN";
+	case NFSD4_CB_FAULT:
+		return "FAULT";
+	}
+	return "UNDEFINED";
+}
+
 static int client_info_show(struct seq_file *m, void *v)
 {
 	struct inode *inode = m->private;
@@ -2383,6 +2401,8 @@ static int client_info_show(struct seq_file *m, void *v)
 		seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
 			clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
 	}
+	seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
+	seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
 	drop_client(clp);
 
 	return 0;
@@ -2665,6 +2685,8 @@ static void force_expire_client(struct nfs4_client *clp)
 	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
 	bool already_expired;
 
+	trace_nfsd_clid_admin_expired(&clp->cl_clientid);
+
 	spin_lock(&clp->cl_lock);
 	clp->cl_time = 0;
 	spin_unlock(&clp->cl_lock);
@@ -2816,14 +2838,11 @@ move_to_confirmed(struct nfs4_client *clp)
 
 	lockdep_assert_held(&nn->client_lock);
 
-	dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
 	list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
 	rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
 	add_clp_to_name_tree(clp, &nn->conf_name_tree);
-	if (!test_and_set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags) &&
-	    clp->cl_nfsd_dentry &&
-	    clp->cl_nfsd_info_dentry)
-		fsnotify_dentry(clp->cl_nfsd_info_dentry, FS_MODIFY);
+	set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
+	trace_nfsd_clid_confirmed(&clp->cl_clientid);
 	renew_client_locked(clp);
 }
 
@@ -3176,20 +3195,24 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			}
 			/* case 6 */
 			exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
+			trace_nfsd_clid_confirmed_r(conf);
 			goto out_copy;
 		}
 		if (!creds_match) { /* case 3 */
 			if (client_has_state(conf)) {
 				status = nfserr_clid_inuse;
+				trace_nfsd_clid_cred_mismatch(conf, rqstp);
 				goto out;
 			}
 			goto out_new;
 		}
 		if (verfs_match) { /* case 2 */
 			conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
+			trace_nfsd_clid_confirmed_r(conf);
 			goto out_copy;
 		}
 		/* case 5, client reboot */
+		trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
 		conf = NULL;
 		goto out_new;
 	}
@@ -3199,16 +3222,19 @@ nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 		goto out;
 	}
 
-	unconf  = find_unconfirmed_client_by_name(&exid->clname, nn);
+	unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
 	if (unconf) /* case 4, possible retry or client restart */
 		unhash_client_locked(unconf);
 
-	/* case 1 (normal case) */
+	/* case 1, new owner ID */
+	trace_nfsd_clid_fresh(new);
+
 out_new:
 	if (conf) {
 		status = mark_client_expired_locked(conf);
 		if (status)
 			goto out;
+		trace_nfsd_clid_replaced(&conf->cl_clientid);
 	}
 	new->cl_minorversion = cstate->minorversion;
 	new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
@@ -3232,8 +3258,10 @@ out:
 out_nolock:
 	if (new)
 		expire_client(new);
-	if (unconf)
+	if (unconf) {
+		trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
 		expire_client(unconf);
+	}
 	return status;
 }
 
@@ -3425,9 +3453,10 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 			goto out_free_conn;
 		}
 	} else if (unconf) {
+		status = nfserr_clid_inuse;
 		if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
 		    !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
-			status = nfserr_clid_inuse;
+			trace_nfsd_clid_cred_mismatch(unconf, rqstp);
 			goto out_free_conn;
 		}
 		status = nfserr_wrong_cred;
@@ -3447,6 +3476,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 				old = NULL;
 				goto out_free_conn;
 			}
+			trace_nfsd_clid_replaced(&old->cl_clientid);
 		}
 		move_to_confirmed(unconf);
 		conf = unconf;
@@ -3471,6 +3501,8 @@ nfsd4_create_session(struct svc_rqst *rqstp,
 	/* cache solo and embedded create sessions under the client_lock */
 	nfsd4_cache_create_session(cr_ses, cs_slot, status);
 	spin_unlock(&nn->client_lock);
+	if (conf == unconf)
+		fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
 	/* init connection and backchannel */
 	nfsd4_init_conn(rqstp, conn, new);
 	nfsd4_put_session(new);
@@ -3904,6 +3936,7 @@ nfsd4_destroy_clientid(struct svc_rqst *rqstp,
 		status = nfserr_wrong_cred;
 		goto out;
 	}
+	trace_nfsd_clid_destroyed(&clp->cl_clientid);
 	unhash_client_locked(clp);
 out:
 	spin_unlock(&nn->client_lock);
@@ -3946,6 +3979,7 @@ nfsd4_reclaim_complete(struct svc_rqst *rqstp,
 		goto out;
 
 	status = nfs_ok;
+	trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
 	nfsd4_client_record_create(clp);
 	inc_reclaim_complete(clp);
 out:
@@ -3967,27 +4001,29 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	new = create_client(clname, rqstp, &clverifier);
 	if (new == NULL)
 		return nfserr_jukebox;
-	/* Cases below refer to rfc 3530 section 14.2.33: */
 	spin_lock(&nn->client_lock);
 	conf = find_confirmed_client_by_name(&clname, nn);
 	if (conf && client_has_state(conf)) {
-		/* case 0: */
 		status = nfserr_clid_inuse;
 		if (clp_used_exchangeid(conf))
 			goto out;
 		if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
-			trace_nfsd_clid_inuse_err(conf);
+			trace_nfsd_clid_cred_mismatch(conf, rqstp);
 			goto out;
 		}
 	}
 	unconf = find_unconfirmed_client_by_name(&clname, nn);
 	if (unconf)
 		unhash_client_locked(unconf);
-	/* We need to handle only case 1: probable callback update */
-	if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
-		copy_clid(new, conf);
-		gen_confirm(new, nn);
-	}
+	if (conf) {
+		if (same_verf(&conf->cl_verifier, &clverifier)) {
+			copy_clid(new, conf);
+			gen_confirm(new, nn);
+		} else
+			trace_nfsd_clid_verf_mismatch(conf, rqstp,
+						      &clverifier);
+	} else
+		trace_nfsd_clid_fresh(new);
 	new->cl_minorversion = 0;
 	gen_callback(new, setclid, rqstp);
 	add_to_unconfirmed(new);
@@ -4000,12 +4036,13 @@ out:
 	spin_unlock(&nn->client_lock);
 	if (new)
 		free_client(new);
-	if (unconf)
+	if (unconf) {
+		trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
 		expire_client(unconf);
+	}
 	return status;
 }
 
-
 __be32
 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 			struct nfsd4_compound_state *cstate,
@@ -4034,25 +4071,27 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 	 * Nevertheless, RFC 7530 recommends INUSE for this case:
 	 */
 	status = nfserr_clid_inuse;
-	if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
+	if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
+		trace_nfsd_clid_cred_mismatch(unconf, rqstp);
 		goto out;
-	if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
+	}
+	if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
+		trace_nfsd_clid_cred_mismatch(conf, rqstp);
 		goto out;
-	/* cases below refer to rfc 3530 section 14.2.34: */
+	}
 	if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
 		if (conf && same_verf(&confirm, &conf->cl_confirm)) {
-			/* case 2: probable retransmit */
 			status = nfs_ok;
-		} else /* case 4: client hasn't noticed we rebooted yet? */
+		} else
 			status = nfserr_stale_clientid;
 		goto out;
 	}
 	status = nfs_ok;
-	if (conf) { /* case 1: callback update */
+	if (conf) {
 		old = unconf;
 		unhash_client_locked(old);
 		nfsd4_change_callback(conf, &unconf->cl_cb_conn);
-	} else { /* case 3: normal case; new or rebooted client */
+	} else {
 		old = find_confirmed_client_by_name(&unconf->cl_name, nn);
 		if (old) {
 			status = nfserr_clid_inuse;
@@ -4065,12 +4104,15 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
 				old = NULL;
 				goto out;
 			}
+			trace_nfsd_clid_replaced(&old->cl_clientid);
 		}
 		move_to_confirmed(unconf);
 		conf = unconf;
 	}
 	get_client_locked(conf);
 	spin_unlock(&nn->client_lock);
+	if (conf == unconf)
+		fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
 	nfsd4_probe_callback(conf);
 	spin_lock(&nn->client_lock);
 	put_client_renew_locked(conf);
@@ -4618,7 +4660,7 @@ nfsd_break_deleg_cb(struct file_lock *fl)
 	struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
 	struct nfs4_file *fp = dp->dl_stid.sc_file;
 
-	trace_nfsd_deleg_break(&dp->dl_stid.sc_stateid);
+	trace_nfsd_cb_recall(&dp->dl_stid);
 
 	/*
 	 * We don't want the locks code to timeout the lease for us;
@@ -5457,6 +5499,69 @@ static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
 	return false;
 }
 
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
+{
+	spin_lock_init(&nn->nfsd_ssc_lock);
+	INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
+	init_waitqueue_head(&nn->nfsd_ssc_waitq);
+}
+EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
+
+/*
+ * This is called when nfsd is being shutdown, after all inter_ssc
+ * cleanup were done, to destroy the ssc delayed unmount list.
+ */
+static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
+{
+	struct nfsd4_ssc_umount_item *ni = NULL;
+	struct nfsd4_ssc_umount_item *tmp;
+
+	spin_lock(&nn->nfsd_ssc_lock);
+	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
+		list_del(&ni->nsui_list);
+		spin_unlock(&nn->nfsd_ssc_lock);
+		mntput(ni->nsui_vfsmount);
+		kfree(ni);
+		spin_lock(&nn->nfsd_ssc_lock);
+	}
+	spin_unlock(&nn->nfsd_ssc_lock);
+}
+
+static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
+{
+	bool do_wakeup = false;
+	struct nfsd4_ssc_umount_item *ni = 0;
+	struct nfsd4_ssc_umount_item *tmp;
+
+	spin_lock(&nn->nfsd_ssc_lock);
+	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
+		if (time_after(jiffies, ni->nsui_expire)) {
+			if (refcount_read(&ni->nsui_refcnt) > 1)
+				continue;
+
+			/* mark being unmount */
+			ni->nsui_busy = true;
+			spin_unlock(&nn->nfsd_ssc_lock);
+			mntput(ni->nsui_vfsmount);
+			spin_lock(&nn->nfsd_ssc_lock);
+
+			/* waiters need to start from begin of list */
+			list_del(&ni->nsui_list);
+			kfree(ni);
+
+			/* wakeup ssc_connect waiters */
+			do_wakeup = true;
+			continue;
+		}
+		break;
+	}
+	if (do_wakeup)
+		wake_up_all(&nn->nfsd_ssc_waitq);
+	spin_unlock(&nn->nfsd_ssc_lock);
+}
+#endif
+
 static time64_t
 nfs4_laundromat(struct nfsd_net *nn)
 {
@@ -5495,10 +5600,8 @@ nfs4_laundromat(struct nfsd_net *nn)
 		clp = list_entry(pos, struct nfs4_client, cl_lru);
 		if (!state_expired(&lt, clp->cl_time))
 			break;
-		if (mark_client_expired_locked(clp)) {
-			trace_nfsd_clid_expired(&clp->cl_clientid);
+		if (mark_client_expired_locked(clp))
 			continue;
-		}
 		list_add(&clp->cl_lru, &reaplist);
 	}
 	spin_unlock(&nn->client_lock);
@@ -5568,6 +5671,10 @@ nfs4_laundromat(struct nfsd_net *nn)
 		list_del_init(&nbl->nbl_lru);
 		free_blocked_lock(nbl);
 	}
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+	/* service the server-to-server copy delayed unmount list */
+	nfsd4_ssc_expire_umount(nn);
+#endif
 out:
 	return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
 }
@@ -6430,8 +6537,10 @@ nfsd4_lm_notify(struct file_lock *fl)
 	}
 	spin_unlock(&nn->blocked_locks_lock);
 
-	if (queue)
+	if (queue) {
+		trace_nfsd_cb_notify_lock(lo, nbl);
 		nfsd4_run_cb(&nbl->nbl_cb);
+	}
 }
 
 static const struct lock_manager_operations nfsd_posix_mng_ops  = {
@@ -7229,7 +7338,6 @@ nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
 	unsigned int strhashval;
 	struct nfs4_client_reclaim *crp;
 
-	trace_nfsd_clid_reclaim(nn, name.len, name.data);
 	crp = alloc_reclaim();
 	if (crp) {
 		strhashval = clientstr_hashval(name);
@@ -7279,8 +7387,6 @@ nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
 	unsigned int strhashval;
 	struct nfs4_client_reclaim *crp = NULL;
 
-	trace_nfsd_clid_find(nn, name.len, name.data);
-
 	strhashval = clientstr_hashval(name);
 	list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
 		if (compare_blob(&crp->cr_name, &name) == 0) {
@@ -7486,6 +7592,9 @@ nfs4_state_shutdown_net(struct net *net)
 
 	nfsd4_client_tracking_exit(net);
 	nfs4_state_destroy_net(net);
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+	nfsd4_ssc_shutdown_umount(nn);
+#endif
 }
 
 void
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 14dbfa75059d..9664303afdaf 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -484,6 +484,10 @@ static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
 extern int nfsd4_is_junction(struct dentry *dentry);
 extern int register_cld_notifier(void);
 extern void unregister_cld_notifier(void);
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+extern void nfsd4_ssc_init_umount_work(struct nfsd_net *nn);
+#endif
+
 #else /* CONFIG_NFSD_V4 */
 static inline int nfsd4_is_junction(struct dentry *dentry)
 {
diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index aff2cda5c6c3..6106697adc04 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -225,15 +225,12 @@ static inline bool fh_fsid_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
  * returns a crc32 hash for the filehandle that is compatible with
  * the one displayed by "wireshark".
  */
-
-static inline u32
-knfsd_fh_hash(struct knfsd_fh *fh)
+static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
 {
 	return ~crc32_le(0xFFFFFFFF, (unsigned char *)&fh->fh_base, fh->fh_size);
 }
 #else
-static inline u32
-knfsd_fh_hash(struct knfsd_fh *fh)
+static inline u32 knfsd_fh_hash(const struct knfsd_fh *fh)
 {
 	return 0;
 }
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index dd5d69921676..ccb59e91011b 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -403,6 +403,9 @@ static int nfsd_startup_net(struct net *net, const struct cred *cred)
 	if (ret)
 		goto out_filecache;
 
+#ifdef CONFIG_NFSD_V4_2_INTER_SSC
+	nfsd4_ssc_init_umount_work(nn);
+#endif
 	nn->nfsd_net_up = true;
 	return 0;
 
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 27a93ebd1d80..adaec43548d1 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -408,7 +408,6 @@ TRACE_EVENT(nfsd_dirent,
 		__entry->ino = ino;
 		__entry->len = namlen;
 		memcpy(__get_str(name), name, namlen);
-		__assign_str(name, name);
 	),
 	TP_printk("fh_hash=0x%08x ino=%llu name=%.*s",
 		__entry->fh_hash, __entry->ino,
@@ -459,7 +458,6 @@ DEFINE_STATEID_EVENT(layout_recall_release);
 
 DEFINE_STATEID_EVENT(open);
 DEFINE_STATEID_EVENT(deleg_read);
-DEFINE_STATEID_EVENT(deleg_break);
 DEFINE_STATEID_EVENT(deleg_recall);
 
 DECLARE_EVENT_CLASS(nfsd_stateseqid_class,
@@ -511,7 +509,12 @@ DEFINE_EVENT(nfsd_clientid_class, nfsd_clid_##name, \
 	TP_PROTO(const clientid_t *clid), \
 	TP_ARGS(clid))
 
-DEFINE_CLIENTID_EVENT(expired);
+DEFINE_CLIENTID_EVENT(expire_unconf);
+DEFINE_CLIENTID_EVENT(reclaim_complete);
+DEFINE_CLIENTID_EVENT(confirmed);
+DEFINE_CLIENTID_EVENT(destroyed);
+DEFINE_CLIENTID_EVENT(admin_expired);
+DEFINE_CLIENTID_EVENT(replaced);
 DEFINE_CLIENTID_EVENT(purged);
 DEFINE_CLIENTID_EVENT(renew);
 DEFINE_CLIENTID_EVENT(stale);
@@ -536,58 +539,102 @@ DEFINE_EVENT(nfsd_net_class, nfsd_##name, \
 DEFINE_NET_EVENT(grace_start);
 DEFINE_NET_EVENT(grace_complete);
 
-DECLARE_EVENT_CLASS(nfsd_clid_class,
-	TP_PROTO(const struct nfsd_net *nn,
-		 unsigned int namelen,
-		 const unsigned char *namedata),
-	TP_ARGS(nn, namelen, namedata),
+TRACE_EVENT(nfsd_clid_cred_mismatch,
+	TP_PROTO(
+		const struct nfs4_client *clp,
+		const struct svc_rqst *rqstp
+	),
+	TP_ARGS(clp, rqstp),
 	TP_STRUCT__entry(
-		__field(unsigned long long, boot_time)
-		__field(unsigned int, namelen)
-		__dynamic_array(unsigned char,  name, namelen)
+		__field(u32, cl_boot)
+		__field(u32, cl_id)
+		__field(unsigned long, cl_flavor)
+		__field(unsigned long, new_flavor)
+		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
 	),
 	TP_fast_assign(
-		__entry->boot_time = nn->boot_time;
-		__entry->namelen = namelen;
-		memcpy(__get_dynamic_array(name), namedata, namelen);
+		__entry->cl_boot = clp->cl_clientid.cl_boot;
+		__entry->cl_id = clp->cl_clientid.cl_id;
+		__entry->cl_flavor = clp->cl_cred.cr_flavor;
+		__entry->new_flavor = rqstp->rq_cred.cr_flavor;
+		memcpy(__entry->addr, &rqstp->rq_xprt->xpt_remote,
+			sizeof(struct sockaddr_in6));
 	),
-	TP_printk("boot_time=%16llx nfs4_clientid=%.*s",
-		__entry->boot_time, __entry->namelen, __get_str(name))
+	TP_printk("client %08x:%08x flavor=%s, conflict=%s from addr=%pISpc",
+		__entry->cl_boot, __entry->cl_id,
+		show_nfsd_authflavor(__entry->cl_flavor),
+		show_nfsd_authflavor(__entry->new_flavor), __entry->addr
+	)
 )
 
-#define DEFINE_CLID_EVENT(name) \
-DEFINE_EVENT(nfsd_clid_class, nfsd_clid_##name, \
-	TP_PROTO(const struct nfsd_net *nn, \
-		 unsigned int namelen, \
-		 const unsigned char *namedata), \
-	TP_ARGS(nn, namelen, namedata))
-
-DEFINE_CLID_EVENT(find);
-DEFINE_CLID_EVENT(reclaim);
+TRACE_EVENT(nfsd_clid_verf_mismatch,
+	TP_PROTO(
+		const struct nfs4_client *clp,
+		const struct svc_rqst *rqstp,
+		const nfs4_verifier *verf
+	),
+	TP_ARGS(clp, rqstp, verf),
+	TP_STRUCT__entry(
+		__field(u32, cl_boot)
+		__field(u32, cl_id)
+		__array(unsigned char, cl_verifier, NFS4_VERIFIER_SIZE)
+		__array(unsigned char, new_verifier, NFS4_VERIFIER_SIZE)
+		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
+	),
+	TP_fast_assign(
+		__entry->cl_boot = clp->cl_clientid.cl_boot;
+		__entry->cl_id = clp->cl_clientid.cl_id;
+		memcpy(__entry->cl_verifier, (void *)&clp->cl_verifier,
+		       NFS4_VERIFIER_SIZE);
+		memcpy(__entry->new_verifier, (void *)verf,
+		       NFS4_VERIFIER_SIZE);
+		memcpy(__entry->addr, &rqstp->rq_xprt->xpt_remote,
+			sizeof(struct sockaddr_in6));
+	),
+	TP_printk("client %08x:%08x verf=0x%s, updated=0x%s from addr=%pISpc",
+		__entry->cl_boot, __entry->cl_id,
+		__print_hex_str(__entry->cl_verifier, NFS4_VERIFIER_SIZE),
+		__print_hex_str(__entry->new_verifier, NFS4_VERIFIER_SIZE),
+		__entry->addr
+	)
+);
 
-TRACE_EVENT(nfsd_clid_inuse_err,
+DECLARE_EVENT_CLASS(nfsd_clid_class,
 	TP_PROTO(const struct nfs4_client *clp),
 	TP_ARGS(clp),
 	TP_STRUCT__entry(
 		__field(u32, cl_boot)
 		__field(u32, cl_id)
 		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
-		__field(unsigned int, namelen)
-		__dynamic_array(unsigned char, name, clp->cl_name.len)
+		__field(unsigned long, flavor)
+		__array(unsigned char, verifier, NFS4_VERIFIER_SIZE)
+		__dynamic_array(char, name, clp->cl_name.len + 1)
 	),
 	TP_fast_assign(
 		__entry->cl_boot = clp->cl_clientid.cl_boot;
 		__entry->cl_id = clp->cl_clientid.cl_id;
 		memcpy(__entry->addr, &clp->cl_addr,
 			sizeof(struct sockaddr_in6));
-		__entry->namelen = clp->cl_name.len;
-		memcpy(__get_dynamic_array(name), clp->cl_name.data,
-			clp->cl_name.len);
-	),
-	TP_printk("nfs4_clientid %.*s already in use by %pISpc, client %08x:%08x",
-		__entry->namelen, __get_str(name), __entry->addr,
+		__entry->flavor = clp->cl_cred.cr_flavor;
+		memcpy(__entry->verifier, (void *)&clp->cl_verifier,
+		       NFS4_VERIFIER_SIZE);
+		memcpy(__get_str(name), clp->cl_name.data, clp->cl_name.len);
+		__get_str(name)[clp->cl_name.len] = '\0';
+	),
+	TP_printk("addr=%pISpc name='%s' verifier=0x%s flavor=%s client=%08x:%08x",
+		__entry->addr, __get_str(name),
+		__print_hex_str(__entry->verifier, NFS4_VERIFIER_SIZE),
+		show_nfsd_authflavor(__entry->flavor),
 		__entry->cl_boot, __entry->cl_id)
-)
+);
+
+#define DEFINE_CLID_EVENT(name) \
+DEFINE_EVENT(nfsd_clid_class, nfsd_clid_##name, \
+	TP_PROTO(const struct nfs4_client *clp), \
+	TP_ARGS(clp))
+
+DEFINE_CLID_EVENT(fresh);
+DEFINE_CLID_EVENT(confirmed_r);
 
 /*
  * from fs/nfsd/filecache.h
@@ -809,9 +856,9 @@ TRACE_EVENT(nfsd_cb_args,
 		memcpy(__entry->addr, &conn->cb_addr,
 			sizeof(struct sockaddr_in6));
 	),
-	TP_printk("client %08x:%08x callback addr=%pISpc prog=%u ident=%u",
-		__entry->cl_boot, __entry->cl_id,
-		__entry->addr, __entry->prog, __entry->ident)
+	TP_printk("addr=%pISpc client %08x:%08x prog=%u ident=%u",
+		__entry->addr, __entry->cl_boot, __entry->cl_id,
+		__entry->prog, __entry->ident)
 );
 
 TRACE_EVENT(nfsd_cb_nodelegs,
@@ -828,11 +875,6 @@ TRACE_EVENT(nfsd_cb_nodelegs,
 	TP_printk("client %08x:%08x", __entry->cl_boot, __entry->cl_id)
 )
 
-TRACE_DEFINE_ENUM(NFSD4_CB_UP);
-TRACE_DEFINE_ENUM(NFSD4_CB_UNKNOWN);
-TRACE_DEFINE_ENUM(NFSD4_CB_DOWN);
-TRACE_DEFINE_ENUM(NFSD4_CB_FAULT);
-
 #define show_cb_state(val)						\
 	__print_symbolic(val,						\
 		{ NFSD4_CB_UP,		"UP" },				\
@@ -866,10 +908,53 @@ DEFINE_EVENT(nfsd_cb_class, nfsd_cb_##name,		\
 	TP_PROTO(const struct nfs4_client *clp),	\
 	TP_ARGS(clp))
 
-DEFINE_NFSD_CB_EVENT(setup);
 DEFINE_NFSD_CB_EVENT(state);
+DEFINE_NFSD_CB_EVENT(probe);
+DEFINE_NFSD_CB_EVENT(lost);
 DEFINE_NFSD_CB_EVENT(shutdown);
 
+TRACE_DEFINE_ENUM(RPC_AUTH_NULL);
+TRACE_DEFINE_ENUM(RPC_AUTH_UNIX);
+TRACE_DEFINE_ENUM(RPC_AUTH_GSS);
+TRACE_DEFINE_ENUM(RPC_AUTH_GSS_KRB5);
+TRACE_DEFINE_ENUM(RPC_AUTH_GSS_KRB5I);
+TRACE_DEFINE_ENUM(RPC_AUTH_GSS_KRB5P);
+
+#define show_nfsd_authflavor(val)					\
+	__print_symbolic(val,						\
+		{ RPC_AUTH_NULL,		"none" },		\
+		{ RPC_AUTH_UNIX,		"sys" },		\
+		{ RPC_AUTH_GSS,			"gss" },		\
+		{ RPC_AUTH_GSS_KRB5,		"krb5" },		\
+		{ RPC_AUTH_GSS_KRB5I,		"krb5i" },		\
+		{ RPC_AUTH_GSS_KRB5P,		"krb5p" })
+
+TRACE_EVENT(nfsd_cb_setup,
+	TP_PROTO(const struct nfs4_client *clp,
+		 const char *netid,
+		 rpc_authflavor_t authflavor
+	),
+	TP_ARGS(clp, netid, authflavor),
+	TP_STRUCT__entry(
+		__field(u32, cl_boot)
+		__field(u32, cl_id)
+		__field(unsigned long, authflavor)
+		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
+		__array(unsigned char, netid, 8)
+	),
+	TP_fast_assign(
+		__entry->cl_boot = clp->cl_clientid.cl_boot;
+		__entry->cl_id = clp->cl_clientid.cl_id;
+		strlcpy(__entry->netid, netid, sizeof(__entry->netid));
+		__entry->authflavor = authflavor;
+		memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
+			sizeof(struct sockaddr_in6));
+	),
+	TP_printk("addr=%pISpc client %08x:%08x proto=%s flavor=%s",
+		__entry->addr, __entry->cl_boot, __entry->cl_id,
+		__entry->netid, show_nfsd_authflavor(__entry->authflavor))
+);
+
 TRACE_EVENT(nfsd_cb_setup_err,
 	TP_PROTO(
 		const struct nfs4_client *clp,
@@ -893,52 +978,97 @@ TRACE_EVENT(nfsd_cb_setup_err,
 		__entry->addr, __entry->cl_boot, __entry->cl_id, __entry->error)
 );
 
-TRACE_EVENT(nfsd_cb_work,
+TRACE_EVENT(nfsd_cb_recall,
 	TP_PROTO(
-		const struct nfs4_client *clp,
-		const char *procedure
+		const struct nfs4_stid *stid
 	),
-	TP_ARGS(clp, procedure),
+	TP_ARGS(stid),
 	TP_STRUCT__entry(
 		__field(u32, cl_boot)
 		__field(u32, cl_id)
-		__string(procedure, procedure)
+		__field(u32, si_id)
+		__field(u32, si_generation)
 		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
 	),
 	TP_fast_assign(
+		const stateid_t *stp = &stid->sc_stateid;
+		const struct nfs4_client *clp = stid->sc_client;
+
+		__entry->cl_boot = stp->si_opaque.so_clid.cl_boot;
+		__entry->cl_id = stp->si_opaque.so_clid.cl_id;
+		__entry->si_id = stp->si_opaque.so_id;
+		__entry->si_generation = stp->si_generation;
+		if (clp)
+			memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
+				sizeof(struct sockaddr_in6));
+		else
+			memset(__entry->addr, 0, sizeof(struct sockaddr_in6));
+	),
+	TP_printk("addr=%pISpc client %08x:%08x stateid %08x:%08x",
+		__entry->addr, __entry->cl_boot, __entry->cl_id,
+		__entry->si_id, __entry->si_generation)
+);
+
+TRACE_EVENT(nfsd_cb_notify_lock,
+	TP_PROTO(
+		const struct nfs4_lockowner *lo,
+		const struct nfsd4_blocked_lock *nbl
+	),
+	TP_ARGS(lo, nbl),
+	TP_STRUCT__entry(
+		__field(u32, cl_boot)
+		__field(u32, cl_id)
+		__field(u32, fh_hash)
+		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
+	),
+	TP_fast_assign(
+		const struct nfs4_client *clp = lo->lo_owner.so_client;
+
 		__entry->cl_boot = clp->cl_clientid.cl_boot;
 		__entry->cl_id = clp->cl_clientid.cl_id;
-		__assign_str(procedure, procedure)
+		__entry->fh_hash = knfsd_fh_hash(&nbl->nbl_fh);
 		memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
 			sizeof(struct sockaddr_in6));
 	),
-	TP_printk("addr=%pISpc client %08x:%08x procedure=%s",
+	TP_printk("addr=%pISpc client %08x:%08x fh_hash=0x%08x",
 		__entry->addr, __entry->cl_boot, __entry->cl_id,
-		__get_str(procedure))
+		__entry->fh_hash)
 );
 
-TRACE_EVENT(nfsd_cb_done,
+TRACE_EVENT(nfsd_cb_offload,
 	TP_PROTO(
 		const struct nfs4_client *clp,
-		int status
+		const stateid_t *stp,
+		const struct knfsd_fh *fh,
+		u64 count,
+		__be32 status
 	),
-	TP_ARGS(clp, status),
+	TP_ARGS(clp, stp, fh, count, status),
 	TP_STRUCT__entry(
 		__field(u32, cl_boot)
 		__field(u32, cl_id)
+		__field(u32, si_id)
+		__field(u32, si_generation)
+		__field(u32, fh_hash)
 		__field(int, status)
+		__field(u64, count)
 		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
 	),
 	TP_fast_assign(
-		__entry->cl_boot = clp->cl_clientid.cl_boot;
-		__entry->cl_id = clp->cl_clientid.cl_id;
-		__entry->status = status;
+		__entry->cl_boot = stp->si_opaque.so_clid.cl_boot;
+		__entry->cl_id = stp->si_opaque.so_clid.cl_id;
+		__entry->si_id = stp->si_opaque.so_id;
+		__entry->si_generation = stp->si_generation;
+		__entry->fh_hash = knfsd_fh_hash(fh);
+		__entry->status = be32_to_cpu(status);
+		__entry->count = count;
 		memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
 			sizeof(struct sockaddr_in6));
 	),
-	TP_printk("addr=%pISpc client %08x:%08x status=%d",
+	TP_printk("addr=%pISpc client %08x:%08x stateid %08x:%08x fh_hash=0x%08x count=%llu status=%d",
 		__entry->addr, __entry->cl_boot, __entry->cl_id,
-		__entry->status)
+		__entry->si_id, __entry->si_generation,
+		__entry->fh_hash, __entry->count, __entry->status)
 );
 
 #endif /* _NFSD_TRACE_H */
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 15adf1f6ab21..a224a5e23cc1 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1123,6 +1123,19 @@ out:
 }
 
 #ifdef CONFIG_NFSD_V3
+static int
+nfsd_filemap_write_and_wait_range(struct nfsd_file *nf, loff_t offset,
+				  loff_t end)
+{
+	struct address_space *mapping = nf->nf_file->f_mapping;
+	int ret = filemap_fdatawrite_range(mapping, offset, end);
+
+	if (ret)
+		return ret;
+	filemap_fdatawait_range_keep_errors(mapping, offset, end);
+	return 0;
+}
+
 /*
  * Commit all pending writes to stable storage.
  *
@@ -1153,10 +1166,11 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (err)
 		goto out;
 	if (EX_ISSYNC(fhp->fh_export)) {
-		int err2;
+		int err2 = nfsd_filemap_write_and_wait_range(nf, offset, end);
 
 		down_write(&nf->nf_rwsem);
-		err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
+		if (!err2)
+			err2 = vfs_fsync_range(nf->nf_file, offset, end, 0);
 		switch (err2) {
 		case 0:
 			nfsd_copy_boot_verifier(verf, net_generic(nf->nf_net,
@@ -1613,9 +1627,9 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
 
 	host_err = vfs_symlink(&init_user_ns, d_inode(dentry), dnew, path);
 	err = nfserrno(host_err);
+	fh_unlock(fhp);
 	if (!err)
 		err = nfserrno(commit_metadata(fhp));
-	fh_unlock(fhp);
 
 	fh_drop_write(fhp);
 
@@ -1680,6 +1694,7 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
 	if (d_really_is_negative(dold))
 		goto out_dput;
 	host_err = vfs_link(dold, &init_user_ns, dirp, dnew, NULL);
+	fh_unlock(ffhp);
 	if (!host_err) {
 		err = nfserrno(commit_metadata(ffhp));
 		if (!err)
@@ -1859,6 +1874,7 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 {
 	struct dentry	*dentry, *rdentry;
 	struct inode	*dirp;
+	struct inode	*rinode;
 	__be32		err;
 	int		host_err;
 
@@ -1887,6 +1903,8 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 		host_err = -ENOENT;
 		goto out_drop_write;
 	}
+	rinode = d_inode(rdentry);
+	ihold(rinode);
 
 	if (!type)
 		type = d_inode(rdentry)->i_mode & S_IFMT;
@@ -1899,9 +1917,11 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 		host_err = vfs_rmdir(&init_user_ns, dirp, rdentry);
 	}
 
+	fh_unlock(fhp);
 	if (!host_err)
 		host_err = commit_metadata(fhp);
 	dput(rdentry);
+	iput(rinode);    /* truncate the inode here */
 
 out_drop_write:
 	fh_drop_write(fhp);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index a7c425254fee..3e4052e3bd50 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -567,6 +567,7 @@ struct nfsd4_copy {
 	struct vfsmount		*ss_mnt;
 	struct nfs_fh		c_fh;
 	nfs4_stateid		stateid;
+	bool			committed;
 };
 
 struct nfsd4_seek {