v4.19.13 snapshot.
diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
new file mode 100644
index 0000000..74a21f6
--- /dev/null
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -0,0 +1,540 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * netdebug.c
+ *
+ * debug functionality for o2net
+ *
+ * Copyright (C) 2005, 2008 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ *
+ */
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <linux/kref.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
+
+#include <linux/uaccess.h>
+
+#include "tcp.h"
+#include "nodemanager.h"
+#define MLOG_MASK_PREFIX ML_TCP
+#include "masklog.h"
+
+#include "tcp_internal.h"
+
+#define O2NET_DEBUG_DIR "o2net"
+#define SC_DEBUG_NAME "sock_containers"
+#define NST_DEBUG_NAME "send_tracking"
+#define STATS_DEBUG_NAME "stats"
+#define NODES_DEBUG_NAME "connected_nodes"
+
+#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 struct dentry *nodes_dentry;
+
+static DEFINE_SPINLOCK(o2net_debug_lock);
+
+static LIST_HEAD(sock_containers);
+static LIST_HEAD(send_tracking);
+
+void o2net_debug_add_nst(struct o2net_send_tracking *nst)
+{
+ spin_lock(&o2net_debug_lock);
+ list_add(&nst->st_net_debug_item, &send_tracking);
+ spin_unlock(&o2net_debug_lock);
+}
+
+void o2net_debug_del_nst(struct o2net_send_tracking *nst)
+{
+ spin_lock(&o2net_debug_lock);
+ if (!list_empty(&nst->st_net_debug_item))
+ list_del_init(&nst->st_net_debug_item);
+ spin_unlock(&o2net_debug_lock);
+}
+
+static struct o2net_send_tracking
+ *next_nst(struct o2net_send_tracking *nst_start)
+{
+ struct o2net_send_tracking *nst, *ret = NULL;
+
+ assert_spin_locked(&o2net_debug_lock);
+
+ list_for_each_entry(nst, &nst_start->st_net_debug_item,
+ st_net_debug_item) {
+ /* discover the head of the list */
+ if (&nst->st_net_debug_item == &send_tracking)
+ break;
+
+ /* use st_task to detect real nsts in the list */
+ if (nst->st_task != NULL) {
+ ret = nst;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void *nst_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct o2net_send_tracking *nst, *dummy_nst = seq->private;
+
+ spin_lock(&o2net_debug_lock);
+ nst = next_nst(dummy_nst);
+ spin_unlock(&o2net_debug_lock);
+
+ return nst;
+}
+
+static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct o2net_send_tracking *nst, *dummy_nst = seq->private;
+
+ spin_lock(&o2net_debug_lock);
+ nst = next_nst(dummy_nst);
+ list_del_init(&dummy_nst->st_net_debug_item);
+ if (nst)
+ list_add(&dummy_nst->st_net_debug_item,
+ &nst->st_net_debug_item);
+ spin_unlock(&o2net_debug_lock);
+
+ return nst; /* unused, just needs to be null when done */
+}
+
+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;
+
+ 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;
+}
+
+static void nst_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations nst_seq_ops = {
+ .start = nst_seq_start,
+ .next = nst_seq_next,
+ .stop = nst_seq_stop,
+ .show = nst_seq_show,
+};
+
+static int nst_fop_open(struct inode *inode, struct file *file)
+{
+ struct o2net_send_tracking *dummy_nst;
+
+ dummy_nst = __seq_open_private(file, &nst_seq_ops, sizeof(*dummy_nst));
+ if (!dummy_nst)
+ return -ENOMEM;
+ o2net_debug_add_nst(dummy_nst);
+
+ return 0;
+}
+
+static int nst_fop_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = file->private_data;
+ struct o2net_send_tracking *dummy_nst = seq->private;
+
+ o2net_debug_del_nst(dummy_nst);
+ return seq_release_private(inode, file);
+}
+
+static const struct file_operations nst_seq_fops = {
+ .open = nst_fop_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = nst_fop_release,
+};
+
+void o2net_debug_add_sc(struct o2net_sock_container *sc)
+{
+ spin_lock(&o2net_debug_lock);
+ list_add(&sc->sc_net_debug_item, &sock_containers);
+ spin_unlock(&o2net_debug_lock);
+}
+
+void o2net_debug_del_sc(struct o2net_sock_container *sc)
+{
+ spin_lock(&o2net_debug_lock);
+ list_del_init(&sc->sc_net_debug_item);
+ 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)
+{
+ struct o2net_sock_container *sc, *ret = NULL;
+
+ assert_spin_locked(&o2net_debug_lock);
+
+ list_for_each_entry(sc, &sc_start->sc_net_debug_item,
+ sc_net_debug_item) {
+ /* discover the head of the list miscast as a sc */
+ if (&sc->sc_net_debug_item == &sock_containers)
+ break;
+
+ /* use sc_page to detect real scs in the list */
+ if (sc->sc_page != NULL) {
+ ret = sc;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ 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);
+ spin_unlock(&o2net_debug_lock);
+
+ return sc;
+}
+
+static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ 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);
+ list_del_init(&dummy_sc->sc_net_debug_item);
+ if (sc)
+ list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
+ spin_unlock(&o2net_debug_lock);
+
+ return sc; /* unused, just needs to be null when done */
+}
+
+#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,
+ kref_read(&sc->sc_kref),
+ &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_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) {
+ 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;
+}
+
+static void sc_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations sc_seq_ops = {
+ .start = sc_seq_start,
+ .next = sc_seq_next,
+ .stop = sc_seq_stop,
+ .show = sc_seq_show,
+};
+
+static int sc_common_open(struct file *file, int ctxt)
+{
+ struct o2net_sock_debug *sd;
+ struct o2net_sock_container *dummy_sc;
+
+ dummy_sc = kzalloc(sizeof(*dummy_sc), GFP_KERNEL);
+ if (!dummy_sc)
+ return -ENOMEM;
+
+ sd = __seq_open_private(file, &sc_seq_ops, sizeof(*sd));
+ if (!sd) {
+ kfree(dummy_sc);
+ return -ENOMEM;
+ }
+
+ sd->dbg_ctxt = ctxt;
+ sd->dbg_sock = dummy_sc;
+
+ o2net_debug_add_sc(dummy_sc);
+
+ return 0;
+}
+
+static int sc_fop_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = file->private_data;
+ struct o2net_sock_debug *sd = seq->private;
+ struct o2net_sock_container *dummy_sc = sd->dbg_sock;
+
+ o2net_debug_del_sc(dummy_sc);
+ kfree(dummy_sc);
+ return seq_release_private(inode, file);
+}
+
+static int stats_fop_open(struct inode *inode, struct file *file)
+{
+ return sc_common_open(file, SHOW_SOCK_STATS);
+}
+
+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)
+{
+ return sc_common_open(file, SHOW_SOCK_CONTAINERS);
+}
+
+static const struct file_operations sc_seq_fops = {
+ .open = sc_fop_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = sc_fop_release,
+};
+
+static int o2net_fill_bitmap(char *buf, int len)
+{
+ unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ int i = -1, out = 0;
+
+ o2net_fill_node_map(map, sizeof(map));
+
+ while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
+ out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
+ out += snprintf(buf + out, PAGE_SIZE - out, "\n");
+
+ return out;
+}
+
+static int nodes_fop_open(struct inode *inode, struct file *file)
+{
+ char *buf;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
+
+ file->private_data = buf;
+
+ return 0;
+}
+
+static int o2net_debug_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static ssize_t o2net_debug_read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
+ i_size_read(file->f_mapping->host));
+}
+
+static const struct file_operations nodes_fops = {
+ .open = nodes_fop_open,
+ .release = o2net_debug_release,
+ .read = o2net_debug_read,
+ .llseek = generic_file_llseek,
+};
+
+void o2net_debugfs_exit(void)
+{
+ debugfs_remove(nodes_dentry);
+ debugfs_remove(stats_dentry);
+ debugfs_remove(sc_dentry);
+ debugfs_remove(nst_dentry);
+ debugfs_remove(o2net_dentry);
+}
+
+int o2net_debugfs_init(void)
+{
+ umode_t mode = S_IFREG|S_IRUSR;
+
+ o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
+ if (o2net_dentry)
+ nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &nst_seq_fops);
+ if (nst_dentry)
+ sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &sc_seq_fops);
+ if (sc_dentry)
+ stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &stats_seq_fops);
+ if (stats_dentry)
+ nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &nodes_fops);
+ if (nodes_dentry)
+ return 0;
+
+ o2net_debugfs_exit();
+ mlog_errno(-ENOMEM);
+ return -ENOMEM;
+}
+
+#endif /* CONFIG_DEBUG_FS */