Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jlbec/ocfs2: (22 commits)
  MAINTAINERS: Update Joel Becker's email address
  ocfs2: Remove unused truncate function from alloc.c
  ocfs2/cluster: dereferencing before checking in nst_seq_show()
  ocfs2: fix build for OCFS2_FS_STATS not enabled
  ocfs2/cluster: Show o2net timing statistics
  ocfs2/cluster: Track process message timing stats for each socket
  ocfs2/cluster: Track send message timing stats for each socket
  ocfs2/cluster: Use ktime instead of timeval in struct o2net_sock_container
  ocfs2/cluster: Replace timeval with ktime in struct o2net_send_tracking
  ocfs2: Add DEBUG_FS dependency
  ocfs2/dlm: Hard code the values for enums
  ocfs2/dlm: Minor cleanup
  ocfs2/dlm: Cleanup dlmdebug.c
  ocfs2: Release buffer_head in case of error in ocfs2_double_lock.
  ocfs2/cluster: Pin the local node when o2hb thread starts
  ocfs2/cluster: Show pin state for each o2hb region
  ocfs2/cluster: Pin/unpin o2hb regions
  ocfs2/cluster: Remove dropped region from o2hb quorum region bitmap
  ocfs2/cluster: Pin the remote node item in configfs
  ocfs2/dlm: make existing convertion precedent over new lock
  ...

4 files changed, 527 insertions, 183 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 9e3d45bcb5fd..a6cc05302e9f 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -82,6 +82,7 @@ static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
 #define O2HB_DB_TYPE_REGION_LIVENODES	4
 #define O2HB_DB_TYPE_REGION_NUMBER	5
 #define O2HB_DB_TYPE_REGION_ELAPSED_TIME	6
+#define O2HB_DB_TYPE_REGION_PINNED	7
 struct o2hb_debug_buf {
 	int db_type;
 	int db_size;
@@ -101,6 +102,7 @@ static struct o2hb_debug_buf *o2hb_db_failedregions;
 #define O2HB_DEBUG_FAILEDREGIONS	"failed_regions"
 #define O2HB_DEBUG_REGION_NUMBER	"num"
 #define O2HB_DEBUG_REGION_ELAPSED_TIME	"elapsed_time_in_ms"
+#define O2HB_DEBUG_REGION_PINNED	"pinned"
 
 static struct dentry *o2hb_debug_dir;
 static struct dentry *o2hb_debug_livenodes;
@@ -132,6 +134,33 @@ char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = {
 unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
 unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL;
 
+/*
+ * o2hb_dependent_users tracks the number of registered callbacks that depend
+ * on heartbeat. o2net and o2dlm are two entities that register this callback.
+ * However only o2dlm depends on the heartbeat. It does not want the heartbeat
+ * to stop while a dlm domain is still active.
+ */
+unsigned int o2hb_dependent_users;
+
+/*
+ * In global heartbeat mode, all regions are pinned if there are one or more
+ * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All
+ * regions are unpinned if the region count exceeds the cut off or the number
+ * of dependent users falls to zero.
+ */
+#define O2HB_PIN_CUT_OFF		3
+
+/*
+ * In local heartbeat mode, we assume the dlm domain name to be the same as
+ * region uuid. This is true for domains created for the file system but not
+ * necessarily true for userdlm domains. This is a known limitation.
+ *
+ * In global heartbeat mode, we pin/unpin all o2hb regions. This solution
+ * works for both file system and userdlm domains.
+ */
+static int o2hb_region_pin(const char *region_uuid);
+static void o2hb_region_unpin(const char *region_uuid);
+
 /* Only sets a new threshold if there are no active regions.
  *
  * No locking or otherwise interesting code is required for reading
@@ -186,7 +215,9 @@ struct o2hb_region {
 	struct config_item	hr_item;
 
 	struct list_head	hr_all_item;
-	unsigned		hr_unclean_stop:1;
+	unsigned		hr_unclean_stop:1,
+				hr_item_pinned:1,
+				hr_item_dropped:1;
 
 	/* protected by the hr_callback_sem */
 	struct task_struct 	*hr_task;
@@ -212,9 +243,11 @@ struct o2hb_region {
 	struct dentry		*hr_debug_livenodes;
 	struct dentry		*hr_debug_regnum;
 	struct dentry		*hr_debug_elapsed_time;
+	struct dentry		*hr_debug_pinned;
 	struct o2hb_debug_buf	*hr_db_livenodes;
 	struct o2hb_debug_buf	*hr_db_regnum;
 	struct o2hb_debug_buf	*hr_db_elapsed_time;
+	struct o2hb_debug_buf	*hr_db_pinned;
 
 	/* let the person setting up hb wait for it to return until it
 	 * has reached a 'steady' state.  This will be fixed when we have
@@ -701,6 +734,14 @@ static void o2hb_set_quorum_device(struct o2hb_region *reg,
 	       config_item_name(&reg->hr_item));
 
 	set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
+
+	/*
+	 * If global heartbeat active, unpin all regions if the
+	 * region count > CUT_OFF
+	 */
+	if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
+			   O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF)
+		o2hb_region_unpin(NULL);
 }
 
 static int o2hb_check_slot(struct o2hb_region *reg,
@@ -1041,6 +1082,9 @@ static int o2hb_thread(void *data)
 
 	set_user_nice(current, -20);
 
+	/* Pin node */
+	o2nm_depend_this_node();
+
 	while (!kthread_should_stop() && !reg->hr_unclean_stop) {
 		/* We track the time spent inside
 		 * o2hb_do_disk_heartbeat so that we avoid more than
@@ -1090,6 +1134,9 @@ static int o2hb_thread(void *data)
 		mlog_errno(ret);
 	}
 
+	/* Unpin node */
+	o2nm_undepend_this_node();
+
 	mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n");
 
 	return 0;
@@ -1142,6 +1189,12 @@ static int o2hb_debug_open(struct inode *inode, struct file *file)
 						 reg->hr_last_timeout_start));
 		goto done;
 
+	case O2HB_DB_TYPE_REGION_PINNED:
+		reg = (struct o2hb_region *)db->db_data;
+		out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
+				!!reg->hr_item_pinned);
+		goto done;
+
 	default:
 		goto done;
 	}
@@ -1315,6 +1368,8 @@ int o2hb_init(void)
 	memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
 	memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap));
 
+	o2hb_dependent_users = 0;
+
 	return o2hb_debug_init();
 }
 
@@ -1384,6 +1439,7 @@ static void o2hb_region_release(struct config_item *item)
 	debugfs_remove(reg->hr_debug_livenodes);
 	debugfs_remove(reg->hr_debug_regnum);
 	debugfs_remove(reg->hr_debug_elapsed_time);
+	debugfs_remove(reg->hr_debug_pinned);
 	debugfs_remove(reg->hr_debug_dir);
 
 	spin_lock(&o2hb_live_lock);
@@ -1948,6 +2004,18 @@ static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
 		goto bail;
 	}
 
+	reg->hr_debug_pinned =
+			o2hb_debug_create(O2HB_DEBUG_REGION_PINNED,
+					  reg->hr_debug_dir,
+					  &(reg->hr_db_pinned),
+					  sizeof(*(reg->hr_db_pinned)),
+					  O2HB_DB_TYPE_REGION_PINNED,
+					  0, 0, reg);
+	if (!reg->hr_debug_pinned) {
+		mlog_errno(ret);
+		goto bail;
+	}
+
 	ret = 0;
 bail:
 	return ret;
@@ -2002,15 +2070,20 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group,
 {
 	struct task_struct *hb_task;
 	struct o2hb_region *reg = to_o2hb_region(item);
+	int quorum_region = 0;
 
 	/* stop the thread when the user removes the region dir */
 	spin_lock(&o2hb_live_lock);
 	if (o2hb_global_heartbeat_active()) {
 		clear_bit(reg->hr_region_num, o2hb_region_bitmap);
 		clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
+		if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
+			quorum_region = 1;
+		clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
 	}
 	hb_task = reg->hr_task;
 	reg->hr_task = NULL;
+	reg->hr_item_dropped = 1;
 	spin_unlock(&o2hb_live_lock);
 
 	if (hb_task)
@@ -2028,7 +2101,27 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group,
 	if (o2hb_global_heartbeat_active())
 		printk(KERN_NOTICE "o2hb: Heartbeat stopped on region %s\n",
 		       config_item_name(&reg->hr_item));
+
 	config_item_put(item);
+
+	if (!o2hb_global_heartbeat_active() || !quorum_region)
+		return;
+
+	/*
+	 * If global heartbeat active and there are dependent users,
+	 * pin all regions if quorum region count <= CUT_OFF
+	 */
+	spin_lock(&o2hb_live_lock);
+
+	if (!o2hb_dependent_users)
+		goto unlock;
+
+	if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
+			   O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
+		o2hb_region_pin(NULL);
+
+unlock:
+	spin_unlock(&o2hb_live_lock);
 }
 
 struct o2hb_heartbeat_group_attribute {
@@ -2214,63 +2307,138 @@ void o2hb_setup_callback(struct o2hb_callback_func *hc,
 }
 EXPORT_SYMBOL_GPL(o2hb_setup_callback);
 
-static struct o2hb_region *o2hb_find_region(const char *region_uuid)
+/*
+ * In local heartbeat mode, region_uuid passed matches the dlm domain name.
+ * In global heartbeat mode, region_uuid passed is NULL.
+ *
+ * In local, we only pin the matching region. In global we pin all the active
+ * regions.
+ */
+static int o2hb_region_pin(const char *region_uuid)
 {
-	struct o2hb_region *p, *reg = NULL;
+	int ret = 0, found = 0;
+	struct o2hb_region *reg;
+	char *uuid;
 
 	assert_spin_locked(&o2hb_live_lock);
 
-	list_for_each_entry(p, &o2hb_all_regions, hr_all_item) {
-		if (!strcmp(region_uuid, config_item_name(&p->hr_item))) {
-			reg = p;
-			break;
+	list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
+		uuid = config_item_name(&reg->hr_item);
+
+		/* local heartbeat */
+		if (region_uuid) {
+			if (strcmp(region_uuid, uuid))
+				continue;
+			found = 1;
+		}
+
+		if (reg->hr_item_pinned || reg->hr_item_dropped)
+			goto skip_pin;
+
+		/* Ignore ENOENT only for local hb (userdlm domain) */
+		ret = o2nm_depend_item(&reg->hr_item);
+		if (!ret) {
+			mlog(ML_CLUSTER, "Pin region %s\n", uuid);
+			reg->hr_item_pinned = 1;
+		} else {
+			if (ret == -ENOENT && found)
+				ret = 0;
+			else {
+				mlog(ML_ERROR, "Pin region %s fails with %d\n",
+				     uuid, ret);
+				break;
+			}
 		}
+skip_pin:
+		if (found)
+			break;
 	}
 
-	return reg;
+	return ret;
 }
 
-static int o2hb_region_get(const char *region_uuid)
+/*
+ * In local heartbeat mode, region_uuid passed matches the dlm domain name.
+ * In global heartbeat mode, region_uuid passed is NULL.
+ *
+ * In local, we only unpin the matching region. In global we unpin all the
+ * active regions.
+ */
+static void o2hb_region_unpin(const char *region_uuid)
 {
-	int ret = 0;
 	struct o2hb_region *reg;
+	char *uuid;
+	int found = 0;
 
-	spin_lock(&o2hb_live_lock);
+	assert_spin_locked(&o2hb_live_lock);
 
-	reg = o2hb_find_region(region_uuid);
-	if (!reg)
-		ret = -ENOENT;
-	spin_unlock(&o2hb_live_lock);
+	list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
+		uuid = config_item_name(&reg->hr_item);
+		if (region_uuid) {
+			if (strcmp(region_uuid, uuid))
+				continue;
+			found = 1;
+		}
 
-	if (ret)
-		goto out;
+		if (reg->hr_item_pinned) {
+			mlog(ML_CLUSTER, "Unpin region %s\n", uuid);
+			o2nm_undepend_item(&reg->hr_item);
+			reg->hr_item_pinned = 0;
+		}
+		if (found)
+			break;
+	}
+}
 
-	ret = o2nm_depend_this_node();
-	if (ret)
-		goto out;
+static int o2hb_region_inc_user(const char *region_uuid)
+{
+	int ret = 0;
 
-	ret = o2nm_depend_item(&reg->hr_item);
-	if (ret)
-		o2nm_undepend_this_node();
+	spin_lock(&o2hb_live_lock);
 
-out:
+	/* local heartbeat */
+	if (!o2hb_global_heartbeat_active()) {
+	    ret = o2hb_region_pin(region_uuid);
+	    goto unlock;
+	}
+
+	/*
+	 * if global heartbeat active and this is the first dependent user,
+	 * pin all regions if quorum region count <= CUT_OFF
+	 */
+	o2hb_dependent_users++;
+	if (o2hb_dependent_users > 1)
+		goto unlock;
+
+	if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
+			   O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
+		ret = o2hb_region_pin(NULL);
+
+unlock:
+	spin_unlock(&o2hb_live_lock);
 	return ret;
 }
 
-static void o2hb_region_put(const char *region_uuid)
+void o2hb_region_dec_user(const char *region_uuid)
 {
-	struct o2hb_region *reg;
-
 	spin_lock(&o2hb_live_lock);
 
-	reg = o2hb_find_region(region_uuid);
+	/* local heartbeat */
+	if (!o2hb_global_heartbeat_active()) {
+	    o2hb_region_unpin(region_uuid);
+	    goto unlock;
+	}
 
-	spin_unlock(&o2hb_live_lock);
+	/*
+	 * if global heartbeat active and there are no dependent users,
+	 * unpin all quorum regions
+	 */
+	o2hb_dependent_users--;
+	if (!o2hb_dependent_users)
+		o2hb_region_unpin(NULL);
 
-	if (reg) {
-		o2nm_undepend_item(&reg->hr_item);
-		o2nm_undepend_this_node();
-	}
+unlock:
+	spin_unlock(&o2hb_live_lock);
 }
 
 int o2hb_register_callback(const char *region_uuid,
@@ -2291,9 +2459,11 @@ int o2hb_register_callback(const char *region_uuid,
 	}
 
 	if (region_uuid) {
-		ret = o2hb_region_get(region_uuid);
-		if (ret)
+		ret = o2hb_region_inc_user(region_uuid);
+		if (ret) {
+			mlog_errno(ret);
 			goto out;
+		}
 	}
 
 	down_write(&o2hb_callback_sem);
@@ -2311,7 +2481,7 @@ int o2hb_register_callback(const char *region_uuid,
 	up_write(&o2hb_callback_sem);
 	ret = 0;
 out:
-	mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n",
+	mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
 	     ret, __builtin_return_address(0), hc);
 	return ret;
 }
@@ -2322,7 +2492,7 @@ void o2hb_unregister_callback(const char *region_uuid,
 {
 	BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
 
-	mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n",
+	mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
 	     __builtin_return_address(0), hc);
 
 	/* XXX Can this happen _with_ a region reference? */
@@ -2330,7 +2500,7 @@ void o2hb_unregister_callback(const char *region_uuid,
 		return;
 
 	if (region_uuid)
-		o2hb_region_put(region_uuid);
+		o2hb_region_dec_user(region_uuid);
 
 	down_write(&o2hb_callback_sem);
 
diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
index a3f150e52b02..3a5835904b3d 100644
--- a/fs/ocfs2/cluster/netdebug.c
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -46,10 +46,15 @@
 #define O2NET_DEBUG_DIR		"o2net"
 #define SC_DEBUG_NAME		"sock_containers"
 #define NST_DEBUG_NAME		"send_tracking"
+#define STATS_DEBUG_NAME	"stats"
+
+#define SHOW_SOCK_CONTAINERS	0
+#define SHOW_SOCK_STATS		1
 
 static struct dentry *o2net_dentry;
 static struct dentry *sc_dentry;
 static struct dentry *nst_dentry;
+static struct dentry *stats_dentry;
 
 static DEFINE_SPINLOCK(o2net_debug_lock);
 
@@ -123,37 +128,42 @@ static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 static int nst_seq_show(struct seq_file *seq, void *v)
 {
 	struct o2net_send_tracking *nst, *dummy_nst = seq->private;
+	ktime_t now;
+	s64 sock, send, status;
 
 	spin_lock(&o2net_debug_lock);
 	nst = next_nst(dummy_nst);
+	if (!nst)
+		goto out;
 
-	if (nst != NULL) {
-		/* get_task_comm isn't exported.  oh well. */
-		seq_printf(seq, "%p:\n"
-			   "  pid:          %lu\n"
-			   "  tgid:         %lu\n"
-			   "  process name: %s\n"
-			   "  node:         %u\n"
-			   "  sc:           %p\n"
-			   "  message id:   %d\n"
-			   "  message type: %u\n"
-			   "  message key:  0x%08x\n"
-			   "  sock acquiry: %lu.%ld\n"
-			   "  send start:   %lu.%ld\n"
-			   "  wait start:   %lu.%ld\n",
-			   nst, (unsigned long)nst->st_task->pid,
-			   (unsigned long)nst->st_task->tgid,
-			   nst->st_task->comm, nst->st_node,
-			   nst->st_sc, nst->st_id, nst->st_msg_type,
-			   nst->st_msg_key,
-			   nst->st_sock_time.tv_sec,
-			   (long)nst->st_sock_time.tv_usec,
-			   nst->st_send_time.tv_sec,
-			   (long)nst->st_send_time.tv_usec,
-			   nst->st_status_time.tv_sec,
-			   (long)nst->st_status_time.tv_usec);
-	}
+	now = ktime_get();
+	sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
+	send = ktime_to_us(ktime_sub(now, nst->st_send_time));
+	status = ktime_to_us(ktime_sub(now, nst->st_status_time));
+
+	/* get_task_comm isn't exported.  oh well. */
+	seq_printf(seq, "%p:\n"
+		   "  pid:          %lu\n"
+		   "  tgid:         %lu\n"
+		   "  process name: %s\n"
+		   "  node:         %u\n"
+		   "  sc:           %p\n"
+		   "  message id:   %d\n"
+		   "  message type: %u\n"
+		   "  message key:  0x%08x\n"
+		   "  sock acquiry: %lld usecs ago\n"
+		   "  send start:   %lld usecs ago\n"
+		   "  wait start:   %lld usecs ago\n",
+		   nst, (unsigned long)task_pid_nr(nst->st_task),
+		   (unsigned long)nst->st_task->tgid,
+		   nst->st_task->comm, nst->st_node,
+		   nst->st_sc, nst->st_id, nst->st_msg_type,
+		   nst->st_msg_key,
+		   (long long)sock,
+		   (long long)send,
+		   (long long)status);
 
+out:
 	spin_unlock(&o2net_debug_lock);
 
 	return 0;
@@ -228,6 +238,11 @@ void o2net_debug_del_sc(struct o2net_sock_container *sc)
 	spin_unlock(&o2net_debug_lock);
 }
 
+struct o2net_sock_debug {
+	int dbg_ctxt;
+	struct o2net_sock_container *dbg_sock;
+};
+
 static struct o2net_sock_container
 			*next_sc(struct o2net_sock_container *sc_start)
 {
@@ -253,7 +268,8 @@ static struct o2net_sock_container
 
 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
 {
-	struct o2net_sock_container *sc, *dummy_sc = seq->private;
+	struct o2net_sock_debug *sd = seq->private;
+	struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 
 	spin_lock(&o2net_debug_lock);
 	sc = next_sc(dummy_sc);
@@ -264,7 +280,8 @@ static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
 
 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-	struct o2net_sock_container *sc, *dummy_sc = seq->private;
+	struct o2net_sock_debug *sd = seq->private;
+	struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 
 	spin_lock(&o2net_debug_lock);
 	sc = next_sc(dummy_sc);
@@ -276,65 +293,107 @@ static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 	return sc; /* unused, just needs to be null when done */
 }
 
-#define TV_SEC_USEC(TV) TV.tv_sec, (long)TV.tv_usec
+#ifdef CONFIG_OCFS2_FS_STATS
+# define sc_send_count(_s)		((_s)->sc_send_count)
+# define sc_recv_count(_s)		((_s)->sc_recv_count)
+# define sc_tv_acquiry_total_ns(_s)	(ktime_to_ns((_s)->sc_tv_acquiry_total))
+# define sc_tv_send_total_ns(_s)	(ktime_to_ns((_s)->sc_tv_send_total))
+# define sc_tv_status_total_ns(_s)	(ktime_to_ns((_s)->sc_tv_status_total))
+# define sc_tv_process_total_ns(_s)	(ktime_to_ns((_s)->sc_tv_process_total))
+#else
+# define sc_send_count(_s)		(0U)
+# define sc_recv_count(_s)		(0U)
+# define sc_tv_acquiry_total_ns(_s)	(0LL)
+# define sc_tv_send_total_ns(_s)	(0LL)
+# define sc_tv_status_total_ns(_s)	(0LL)
+# define sc_tv_process_total_ns(_s)	(0LL)
+#endif
+
+/* So that debugfs.ocfs2 can determine which format is being used */
+#define O2NET_STATS_STR_VERSION		1
+static void sc_show_sock_stats(struct seq_file *seq,
+			       struct o2net_sock_container *sc)
+{
+	if (!sc)
+		return;
+
+	seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
+		   sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
+		   (long long)sc_tv_acquiry_total_ns(sc),
+		   (long long)sc_tv_send_total_ns(sc),
+		   (long long)sc_tv_status_total_ns(sc),
+		   (unsigned long)sc_recv_count(sc),
+		   (long long)sc_tv_process_total_ns(sc));
+}
+
+static void sc_show_sock_container(struct seq_file *seq,
+				   struct o2net_sock_container *sc)
+{
+	struct inet_sock *inet = NULL;
+	__be32 saddr = 0, daddr = 0;
+	__be16 sport = 0, dport = 0;
+
+	if (!sc)
+		return;
+
+	if (sc->sc_sock) {
+		inet = inet_sk(sc->sc_sock->sk);
+		/* the stack's structs aren't sparse endian clean */
+		saddr = (__force __be32)inet->inet_saddr;
+		daddr = (__force __be32)inet->inet_daddr;
+		sport = (__force __be16)inet->inet_sport;
+		dport = (__force __be16)inet->inet_dport;
+	}
+
+	/* XXX sigh, inet-> doesn't have sparse annotation so any
+	 * use of it here generates a warning with -Wbitwise */
+	seq_printf(seq, "%p:\n"
+		   "  krefs:           %d\n"
+		   "  sock:            %pI4:%u -> "
+				      "%pI4:%u\n"
+		   "  remote node:     %s\n"
+		   "  page off:        %zu\n"
+		   "  handshake ok:    %u\n"
+		   "  timer:           %lld usecs\n"
+		   "  data ready:      %lld usecs\n"
+		   "  advance start:   %lld usecs\n"
+		   "  advance stop:    %lld usecs\n"
+		   "  func start:      %lld usecs\n"
+		   "  func stop:       %lld usecs\n"
+		   "  func key:        0x%08x\n"
+		   "  func type:       %u\n",
+		   sc,
+		   atomic_read(&sc->sc_kref.refcount),
+		   &saddr, inet ? ntohs(sport) : 0,
+		   &daddr, inet ? ntohs(dport) : 0,
+		   sc->sc_node->nd_name,
+		   sc->sc_page_off,
+		   sc->sc_handshake_ok,
+		   (long long)ktime_to_us(sc->sc_tv_timer),
+		   (long long)ktime_to_us(sc->sc_tv_data_ready),
+		   (long long)ktime_to_us(sc->sc_tv_advance_start),
+		   (long long)ktime_to_us(sc->sc_tv_advance_stop),
+		   (long long)ktime_to_us(sc->sc_tv_func_start),
+		   (long long)ktime_to_us(sc->sc_tv_func_stop),
+		   sc->sc_msg_key,
+		   sc->sc_msg_type);
+}
 
 static int sc_seq_show(struct seq_file *seq, void *v)
 {
-	struct o2net_sock_container *sc, *dummy_sc = seq->private;
+	struct o2net_sock_debug *sd = seq->private;
+	struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 
 	spin_lock(&o2net_debug_lock);
 	sc = next_sc(dummy_sc);
 
-	if (sc != NULL) {
-		struct inet_sock *inet = NULL;
-
-		__be32 saddr = 0, daddr = 0;
-		__be16 sport = 0, dport = 0;
-
-		if (sc->sc_sock) {
-			inet = inet_sk(sc->sc_sock->sk);
-			/* the stack's structs aren't sparse endian clean */
-			saddr = (__force __be32)inet->inet_saddr;
-			daddr = (__force __be32)inet->inet_daddr;
-			sport = (__force __be16)inet->inet_sport;
-			dport = (__force __be16)inet->inet_dport;
-		}
-
-		/* XXX sigh, inet-> doesn't have sparse annotation so any
-		 * use of it here generates a warning with -Wbitwise */
-		seq_printf(seq, "%p:\n"
-			   "  krefs:           %d\n"
-			   "  sock:            %pI4:%u -> "
-					      "%pI4:%u\n"
-			   "  remote node:     %s\n"
-			   "  page off:        %zu\n"
-			   "  handshake ok:    %u\n"
-			   "  timer:           %lu.%ld\n"
-			   "  data ready:      %lu.%ld\n"
-			   "  advance start:   %lu.%ld\n"
-			   "  advance stop:    %lu.%ld\n"
-			   "  func start:      %lu.%ld\n"
-			   "  func stop:       %lu.%ld\n"
-			   "  func key:        %u\n"
-			   "  func type:       %u\n",
-			   sc,
-			   atomic_read(&sc->sc_kref.refcount),
-			   &saddr, inet ? ntohs(sport) : 0,
-			   &daddr, inet ? ntohs(dport) : 0,
-			   sc->sc_node->nd_name,
-			   sc->sc_page_off,
-			   sc->sc_handshake_ok,
-			   TV_SEC_USEC(sc->sc_tv_timer),
-			   TV_SEC_USEC(sc->sc_tv_data_ready),
-			   TV_SEC_USEC(sc->sc_tv_advance_start),
-			   TV_SEC_USEC(sc->sc_tv_advance_stop),
-			   TV_SEC_USEC(sc->sc_tv_func_start),
-			   TV_SEC_USEC(sc->sc_tv_func_stop),
-			   sc->sc_msg_key,
-			   sc->sc_msg_type);
+	if (sc) {
+		if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
+			sc_show_sock_container(seq, sc);
+		else
+			sc_show_sock_stats(seq, sc);
 	}
 
-
 	spin_unlock(&o2net_debug_lock);
 
 	return 0;
@@ -351,7 +410,7 @@ static const struct seq_operations sc_seq_ops = {
 	.show = sc_seq_show,
 };
 
-static int sc_fop_open(struct inode *inode, struct file *file)
+static int sc_common_open(struct file *file, struct o2net_sock_debug *sd)
 {
 	struct o2net_sock_container *dummy_sc;
 	struct seq_file *seq;
@@ -369,7 +428,8 @@ static int sc_fop_open(struct inode *inode, struct file *file)
 		goto out;
 
 	seq = file->private_data;
-	seq->private = dummy_sc;
+	seq->private = sd;
+	sd->dbg_sock = dummy_sc;
 	o2net_debug_add_sc(dummy_sc);
 
 	dummy_sc = NULL;
@@ -382,12 +442,48 @@ out:
 static int sc_fop_release(struct inode *inode, struct file *file)
 {
 	struct seq_file *seq = file->private_data;
-	struct o2net_sock_container *dummy_sc = seq->private;
+	struct o2net_sock_debug *sd = seq->private;
+	struct o2net_sock_container *dummy_sc = sd->dbg_sock;
 
 	o2net_debug_del_sc(dummy_sc);
 	return seq_release_private(inode, file);
 }
 
+static int stats_fop_open(struct inode *inode, struct file *file)
+{
+	struct o2net_sock_debug *sd;
+
+	sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
+	if (sd == NULL)
+		return -ENOMEM;
+
+	sd->dbg_ctxt = SHOW_SOCK_STATS;
+	sd->dbg_sock = NULL;
+
+	return sc_common_open(file, sd);
+}
+
+static const struct file_operations stats_seq_fops = {
+	.open = stats_fop_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = sc_fop_release,
+};
+
+static int sc_fop_open(struct inode *inode, struct file *file)
+{
+	struct o2net_sock_debug *sd;
+
+	sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
+	if (sd == NULL)
+		return -ENOMEM;
+
+	sd->dbg_ctxt = SHOW_SOCK_CONTAINERS;
+	sd->dbg_sock = NULL;
+
+	return sc_common_open(file, sd);
+}
+
 static const struct file_operations sc_seq_fops = {
 	.open = sc_fop_open,
 	.read = seq_read,
@@ -419,25 +515,29 @@ int o2net_debugfs_init(void)
 		goto bail;
 	}
 
+	stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, S_IFREG|S_IRUSR,
+					   o2net_dentry, NULL,
+					   &stats_seq_fops);
+	if (!stats_dentry) {
+		mlog_errno(-ENOMEM);
+		goto bail;
+	}
+
 	return 0;
 bail:
-	if (sc_dentry)
-		debugfs_remove(sc_dentry);
-	if (nst_dentry)
-		debugfs_remove(nst_dentry);
-	if (o2net_dentry)
-		debugfs_remove(o2net_dentry);
+	debugfs_remove(stats_dentry);
+	debugfs_remove(sc_dentry);
+	debugfs_remove(nst_dentry);
+	debugfs_remove(o2net_dentry);
 	return -ENOMEM;
 }
 
 void o2net_debugfs_exit(void)
 {
-	if (sc_dentry)
-		debugfs_remove(sc_dentry);
-	if (nst_dentry)
-		debugfs_remove(nst_dentry);
-	if (o2net_dentry)
-		debugfs_remove(o2net_dentry);
+	debugfs_remove(stats_dentry);
+	debugfs_remove(sc_dentry);
+	debugfs_remove(nst_dentry);
+	debugfs_remove(o2net_dentry);
 }
 
 #endif	/* CONFIG_DEBUG_FS */
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 9aa426e42123..3b11cb1e38fc 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -153,63 +153,114 @@ static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
 	nst->st_node = node;
 }
 
-static void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
 {
-	do_gettimeofday(&nst->st_sock_time);
+	nst->st_sock_time = ktime_get();
 }
 
-static void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
 {
-	do_gettimeofday(&nst->st_send_time);
+	nst->st_send_time = ktime_get();
 }
 
-static void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
 {
-	do_gettimeofday(&nst->st_status_time);
+	nst->st_status_time = ktime_get();
 }
 
-static void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
-					 struct o2net_sock_container *sc)
+static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
+						struct o2net_sock_container *sc)
 {
 	nst->st_sc = sc;
 }
 
-static void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, u32 msg_id)
+static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
+					u32 msg_id)
 {
 	nst->st_id = msg_id;
 }
 
-#else  /* CONFIG_DEBUG_FS */
-
-static inline void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
-				  u32 msgkey, struct task_struct *task, u8 node)
+static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_timer = ktime_get();
 }
 
-static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_data_ready = ktime_get();
 }
 
-static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_advance_start = ktime_get();
 }
 
-static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
+static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_advance_stop = ktime_get();
 }
 
-static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
-						struct o2net_sock_container *sc)
+static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_func_start = ktime_get();
 }
 
-static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
-					u32 msg_id)
+static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
 {
+	sc->sc_tv_func_stop = ktime_get();
 }
 
+static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
+{
+	return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
+}
+#else  /* CONFIG_DEBUG_FS */
+# define o2net_init_nst(a, b, c, d, e)
+# define o2net_set_nst_sock_time(a)
+# define o2net_set_nst_send_time(a)
+# define o2net_set_nst_status_time(a)
+# define o2net_set_nst_sock_container(a, b)
+# define o2net_set_nst_msg_id(a, b)
+# define o2net_set_sock_timer(a)
+# define o2net_set_data_ready_time(a)
+# define o2net_set_advance_start_time(a)
+# define o2net_set_advance_stop_time(a)
+# define o2net_set_func_start_time(a)
+# define o2net_set_func_stop_time(a)
+# define o2net_get_func_run_time(a)		(ktime_t)0
 #endif /* CONFIG_DEBUG_FS */
 
+#ifdef CONFIG_OCFS2_FS_STATS
+static void o2net_update_send_stats(struct o2net_send_tracking *nst,
+				    struct o2net_sock_container *sc)
+{
+	sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
+					   ktime_sub(ktime_get(),
+						     nst->st_status_time));
+	sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
+					 ktime_sub(nst->st_status_time,
+						   nst->st_send_time));
+	sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
+					    ktime_sub(nst->st_send_time,
+						      nst->st_sock_time));
+	sc->sc_send_count++;
+}
+
+static void o2net_update_recv_stats(struct o2net_sock_container *sc)
+{
+	sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
+					    o2net_get_func_run_time(sc));
+	sc->sc_recv_count++;
+}
+
+#else
+
+# define o2net_update_send_stats(a, b)
+
+# define o2net_update_recv_stats(sc)
+
+#endif /* CONFIG_OCFS2_FS_STATS */
+
 static inline int o2net_reconnect_delay(void)
 {
 	return o2nm_single_cluster->cl_reconnect_delay_ms;
@@ -355,6 +406,7 @@ static void sc_kref_release(struct kref *kref)
 		sc->sc_sock = NULL;
 	}
 
+	o2nm_undepend_item(&sc->sc_node->nd_item);
 	o2nm_node_put(sc->sc_node);
 	sc->sc_node = NULL;
 
@@ -376,6 +428,7 @@ static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
 {
 	struct o2net_sock_container *sc, *ret = NULL;
 	struct page *page = NULL;
+	int status = 0;
 
 	page = alloc_page(GFP_NOFS);
 	sc = kzalloc(sizeof(*sc), GFP_NOFS);
@@ -386,6 +439,13 @@ static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
 	o2nm_node_get(node);
 	sc->sc_node = node;
 
+	/* pin the node item of the remote node */
+	status = o2nm_depend_item(&node->nd_item);
+	if (status) {
+		mlog_errno(status);
+		o2nm_node_put(node);
+		goto out;
+	}
 	INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
 	INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
 	INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
@@ -546,7 +606,7 @@ static void o2net_data_ready(struct sock *sk, int bytes)
 	if (sk->sk_user_data) {
 		struct o2net_sock_container *sc = sk->sk_user_data;
 		sclog(sc, "data_ready hit\n");
-		do_gettimeofday(&sc->sc_tv_data_ready);
+		o2net_set_data_ready_time(sc);
 		o2net_sc_queue_work(sc, &sc->sc_rx_work);
 		ready = sc->sc_data_ready;
 	} else {
@@ -1070,6 +1130,8 @@ int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
 	o2net_set_nst_status_time(&nst);
 	wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
 
+	o2net_update_send_stats(&nst, sc);
+
 	/* Note that we avoid overwriting the callers status return
 	 * variable if a system error was reported on the other
 	 * side. Callers beware. */
@@ -1183,13 +1245,15 @@ static int o2net_process_message(struct o2net_sock_container *sc,
 	if (syserr != O2NET_ERR_NONE)
 		goto out_respond;
 
-	do_gettimeofday(&sc->sc_tv_func_start);
+	o2net_set_func_start_time(sc);
 	sc->sc_msg_key = be32_to_cpu(hdr->key);
 	sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
 	handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
 					     be16_to_cpu(hdr->data_len),
 					nmh->nh_func_data, &ret_data);
-	do_gettimeofday(&sc->sc_tv_func_stop);
+	o2net_set_func_stop_time(sc);
+
+	o2net_update_recv_stats(sc);
 
 out_respond:
 	/* this destroys the hdr, so don't use it after this */
@@ -1300,7 +1364,7 @@ static int o2net_advance_rx(struct o2net_sock_container *sc)
 	size_t datalen;
 
 	sclog(sc, "receiving\n");
-	do_gettimeofday(&sc->sc_tv_advance_start);
+	o2net_set_advance_start_time(sc);
 
 	if (unlikely(sc->sc_handshake_ok == 0)) {
 		if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
@@ -1375,7 +1439,7 @@ static int o2net_advance_rx(struct o2net_sock_container *sc)
 
 out:
 	sclog(sc, "ret = %d\n", ret);
-	do_gettimeofday(&sc->sc_tv_advance_stop);
+	o2net_set_advance_stop_time(sc);
 	return ret;
 }
 
@@ -1475,27 +1539,28 @@ static void o2net_idle_timer(unsigned long data)
 {
 	struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
 	struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
-	struct timeval now;
 
-	do_gettimeofday(&now);
+#ifdef CONFIG_DEBUG_FS
+	ktime_t now = ktime_get();
+#endif
 
 	printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u "
 	     "seconds, shutting it down.\n", SC_NODEF_ARGS(sc),
 		     o2net_idle_timeout() / 1000,
 		     o2net_idle_timeout() % 1000);
-	mlog(ML_NOTICE, "here are some times that might help debug the "
-	     "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv "
-	     "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n",
-	     sc->sc_tv_timer.tv_sec, (long) sc->sc_tv_timer.tv_usec,
-	     now.tv_sec, (long) now.tv_usec,
-	     sc->sc_tv_data_ready.tv_sec, (long) sc->sc_tv_data_ready.tv_usec,
-	     sc->sc_tv_advance_start.tv_sec,
-	     (long) sc->sc_tv_advance_start.tv_usec,
-	     sc->sc_tv_advance_stop.tv_sec,
-	     (long) sc->sc_tv_advance_stop.tv_usec,
+
+#ifdef CONFIG_DEBUG_FS
+	mlog(ML_NOTICE, "Here are some times that might help debug the "
+	     "situation: (Timer: %lld, Now %lld, DataReady %lld, Advance %lld-%lld, "
+	     "Key 0x%08x, Func %u, FuncTime %lld-%lld)\n",
+	     (long long)ktime_to_us(sc->sc_tv_timer), (long long)ktime_to_us(now),
+	     (long long)ktime_to_us(sc->sc_tv_data_ready),
+	     (long long)ktime_to_us(sc->sc_tv_advance_start),
+	     (long long)ktime_to_us(sc->sc_tv_advance_stop),
 	     sc->sc_msg_key, sc->sc_msg_type,
-	     sc->sc_tv_func_start.tv_sec, (long) sc->sc_tv_func_start.tv_usec,
-	     sc->sc_tv_func_stop.tv_sec, (long) sc->sc_tv_func_stop.tv_usec);
+	     (long long)ktime_to_us(sc->sc_tv_func_start),
+	     (long long)ktime_to_us(sc->sc_tv_func_stop));
+#endif
 
 	/*
 	 * Initialize the nn_timeout so that the next connection attempt
@@ -1511,7 +1576,7 @@ static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
 	o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
 	o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
 		      msecs_to_jiffies(o2net_keepalive_delay()));
-	do_gettimeofday(&sc->sc_tv_timer);
+	o2net_set_sock_timer(sc);
 	mod_timer(&sc->sc_idle_timeout,
 	       jiffies + msecs_to_jiffies(o2net_idle_timeout()));
 }
diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h
index 15fdbdf9eb4b..4cbcb65784a3 100644
--- a/fs/ocfs2/cluster/tcp_internal.h
+++ b/fs/ocfs2/cluster/tcp_internal.h
@@ -166,18 +166,27 @@ struct o2net_sock_container {
 	/* original handlers for the sockets */
 	void			(*sc_state_change)(struct sock *sk);
 	void			(*sc_data_ready)(struct sock *sk, int bytes);
-#ifdef CONFIG_DEBUG_FS
-	struct list_head        sc_net_debug_item;
-#endif
-	struct timeval 		sc_tv_timer;
-	struct timeval 		sc_tv_data_ready;
-	struct timeval 		sc_tv_advance_start;
-	struct timeval 		sc_tv_advance_stop;
-	struct timeval 		sc_tv_func_start;
-	struct timeval 		sc_tv_func_stop;
+
 	u32			sc_msg_key;
 	u16			sc_msg_type;
 
+#ifdef CONFIG_DEBUG_FS
+	struct list_head        sc_net_debug_item;
+	ktime_t			sc_tv_timer;
+	ktime_t			sc_tv_data_ready;
+	ktime_t			sc_tv_advance_start;
+	ktime_t			sc_tv_advance_stop;
+	ktime_t			sc_tv_func_start;
+	ktime_t			sc_tv_func_stop;
+#endif
+#ifdef CONFIG_OCFS2_FS_STATS
+	ktime_t			sc_tv_acquiry_total;
+	ktime_t			sc_tv_send_total;
+	ktime_t			sc_tv_status_total;
+	u32			sc_send_count;
+	u32			sc_recv_count;
+	ktime_t			sc_tv_process_total;
+#endif
 	struct mutex		sc_send_lock;
 };
 
@@ -220,9 +229,9 @@ struct o2net_send_tracking {
 	u32				st_msg_type;
 	u32				st_msg_key;
 	u8				st_node;
-	struct timeval			st_sock_time;
-	struct timeval			st_send_time;
-	struct timeval			st_status_time;
+	ktime_t				st_sock_time;
+	ktime_t				st_send_time;
+	ktime_t				st_status_time;
 };
 #else
 struct o2net_send_tracking {