[linux.git] / fs / ocfs2 / cluster / netdebug.c

/* -*- 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;
	struct seq_file *seq;
	int ret;

	dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
	if (dummy_nst == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	dummy_nst->st_task = NULL;

	ret = seq_open(file, &nst_seq_ops);
	if (ret)
		goto out;

	seq = file->private_data;
	seq->private = dummy_nst;
	o2net_debug_add_nst(dummy_nst);

	dummy_nst = NULL;

out:
	kfree(dummy_nst);
	return ret;
}

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,
		   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_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, struct o2net_sock_debug *sd)
{
	struct o2net_sock_container *dummy_sc;
	struct seq_file *seq;
	int ret;

	dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
	if (dummy_sc == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	dummy_sc->sc_page = NULL;

	ret = seq_open(file, &sc_seq_ops);
	if (ret)
		goto out;

	seq = file->private_data;
	seq->private = sd;
	sd->dbg_sock = dummy_sc;
	o2net_debug_add_sc(dummy_sc);

	dummy_sc = NULL;

out:
	kfree(dummy_sc);
	return ret;
}

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);
	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,
	.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 */
Commit	Line	Data
2309e9e0 SM	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* netdebug.c
	5	*
	6	* debug functionality for o2net
	7	*
	8	* Copyright (C) 2005, 2008 Oracle. All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public
	12	* License as published by the Free Software Foundation; either
	13	* version 2 of the License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public
	21	* License along with this program; if not, write to the
	22	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	23	* Boston, MA 021110-1307, USA.
	24	*
	25	*/
	26
	27	#ifdef CONFIG_DEBUG_FS
	28
	29	#include <linux/module.h>
	30	#include <linux/types.h>
	31	#include <linux/slab.h>
	32	#include <linux/idr.h>
	33	#include <linux/kref.h>
	34	#include <linux/seq_file.h>
	35	#include <linux/debugfs.h>
	36
	37	#include <linux/uaccess.h>
	38
	39	#include "tcp.h"
	40	#include "nodemanager.h"
	41	#define MLOG_MASK_PREFIX ML_TCP
	42	#include "masklog.h"
	43
	44	#include "tcp_internal.h"
	45
	46	#define O2NET_DEBUG_DIR "o2net"
	47	#define SC_DEBUG_NAME "sock_containers"
	48	#define NST_DEBUG_NAME "send_tracking"
db02754c	49	#define STATS_DEBUG_NAME "stats"
3ba169cc	50	#define NODES_DEBUG_NAME "connected_nodes"
db02754c SM	51
	52	#define SHOW_SOCK_CONTAINERS 0
	53	#define SHOW_SOCK_STATS 1
2309e9e0 SM	54
	55	static struct dentry *o2net_dentry;
	56	static struct dentry *sc_dentry;
	57	static struct dentry *nst_dentry;
db02754c	58	static struct dentry *stats_dentry;
3ba169cc	59	static struct dentry *nodes_dentry;
2309e9e0 SM	60
	61	static DEFINE_SPINLOCK(o2net_debug_lock);
	62
	63	static LIST_HEAD(sock_containers);
	64	static LIST_HEAD(send_tracking);
	65
	66	void o2net_debug_add_nst(struct o2net_send_tracking *nst)
	67	{
	68	spin_lock(&o2net_debug_lock);
	69	list_add(&nst->st_net_debug_item, &send_tracking);
	70	spin_unlock(&o2net_debug_lock);
	71	}
	72
	73	void o2net_debug_del_nst(struct o2net_send_tracking *nst)
	74	{
	75	spin_lock(&o2net_debug_lock);
	76	if (!list_empty(&nst->st_net_debug_item))
	77	list_del_init(&nst->st_net_debug_item);
	78	spin_unlock(&o2net_debug_lock);
	79	}
	80
	81	static struct o2net_send_tracking
	82	next_nst(struct o2net_send_tracking nst_start)
	83	{
	84	struct o2net_send_tracking nst, ret = NULL;
	85
	86	assert_spin_locked(&o2net_debug_lock);
	87
	88	list_for_each_entry(nst, &nst_start->st_net_debug_item,
	89	st_net_debug_item) {
	90	/* discover the head of the list */
	91	if (&nst->st_net_debug_item == &send_tracking)
	92	break;
	93
	94	/* use st_task to detect real nsts in the list */
	95	if (nst->st_task != NULL) {
	96	ret = nst;
	97	break;
	98	}
	99	}
	100
	101	return ret;
	102	}
	103
	104	static void nst_seq_start(struct seq_file seq, loff_t *pos)
	105	{
	106	struct o2net_send_tracking nst, dummy_nst = seq->private;
	107
	108	spin_lock(&o2net_debug_lock);
	109	nst = next_nst(dummy_nst);
	110	spin_unlock(&o2net_debug_lock);
	111
	112	return nst;
	113	}
	114
	115	static void nst_seq_next(struct seq_file seq, void v, loff_t pos)
	116	{
	117	struct o2net_send_tracking nst, dummy_nst = seq->private;
	118
	119	spin_lock(&o2net_debug_lock);
	120	nst = next_nst(dummy_nst);
	121	list_del_init(&dummy_nst->st_net_debug_item);
	122	if (nst)
	123	list_add(&dummy_nst->st_net_debug_item,
124	&nst->st_net_debug_item);
125	spin_unlock(&o2net_debug_lock);
126
127	return nst; /* unused, just needs to be null when done */
128	}
129
130	static int nst_seq_show(struct seq_file seq, void v)
131	{
132	struct o2net_send_tracking nst, dummy_nst = seq->private;
3f9c14fa SM	133	ktime_t now;
3f9c14fa SM	134	s64 sock, send, status;
2309e9e0 SM	135
	136	spin_lock(&o2net_debug_lock);
	137	nst = next_nst(dummy_nst);
cc548166 DC	138	if (!nst)
cc548166 DC	139	goto out;
2309e9e0	140
3f9c14fa SM	141	now = ktime_get();
	142	sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
	143	send = ktime_to_us(ktime_sub(now, nst->st_send_time));
	144	status = ktime_to_us(ktime_sub(now, nst->st_status_time));
	145
cc548166 DC	146	/* get_task_comm isn't exported. oh well. */
	147	seq_printf(seq, "%p:\n"
	148	" pid: %lu\n"
	149	" tgid: %lu\n"
	150	" process name: %s\n"
	151	" node: %u\n"
	152	" sc: %p\n"
	153	" message id: %d\n"
	154	" message type: %u\n"
	155	" message key: 0x%08x\n"
	156	" sock acquiry: %lld usecs ago\n"
	157	" send start: %lld usecs ago\n"
	158	" wait start: %lld usecs ago\n",
	159	nst, (unsigned long)task_pid_nr(nst->st_task),
	160	(unsigned long)nst->st_task->tgid,
	161	nst->st_task->comm, nst->st_node,
	162	nst->st_sc, nst->st_id, nst->st_msg_type,
	163	nst->st_msg_key,
	164	(long long)sock,
	165	(long long)send,
	166	(long long)status);
2309e9e0	167
cc548166	168	out:
2309e9e0 SM	169	spin_unlock(&o2net_debug_lock);
	170
	171	return 0;
	172	}
	173
	174	static void nst_seq_stop(struct seq_file seq, void v)
	175	{
	176	}
	177
88e9d34c	178	static const struct seq_operations nst_seq_ops = {
2309e9e0 SM	179	.start = nst_seq_start,
	180	.next = nst_seq_next,
	181	.stop = nst_seq_stop,
	182	.show = nst_seq_show,
	183	};
	184
	185	static int nst_fop_open(struct inode inode, struct file file)
	186	{
	187	struct o2net_send_tracking *dummy_nst;
	188	struct seq_file *seq;
	189	int ret;
	190
	191	dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
	192	if (dummy_nst == NULL) {
	193	ret = -ENOMEM;
	194	goto out;
	195	}
	196	dummy_nst->st_task = NULL;
	197
	198	ret = seq_open(file, &nst_seq_ops);
	199	if (ret)
	200	goto out;
	201
	202	seq = file->private_data;
	203	seq->private = dummy_nst;
	204	o2net_debug_add_nst(dummy_nst);
	205
	206	dummy_nst = NULL;
	207
	208	out:
	209	kfree(dummy_nst);
	210	return ret;
	211	}
	212
	213	static int nst_fop_release(struct inode inode, struct file file)
	214	{
	215	struct seq_file *seq = file->private_data;
	216	struct o2net_send_tracking *dummy_nst = seq->private;
	217
	218	o2net_debug_del_nst(dummy_nst);
	219	return seq_release_private(inode, file);
	220	}
	221
828c0950	222	static const struct file_operations nst_seq_fops = {
2309e9e0 SM	223	.open = nst_fop_open,
	224	.read = seq_read,
	225	.llseek = seq_lseek,
	226	.release = nst_fop_release,
	227	};
	228
	229	void o2net_debug_add_sc(struct o2net_sock_container *sc)
	230	{
	231	spin_lock(&o2net_debug_lock);
	232	list_add(&sc->sc_net_debug_item, &sock_containers);
	233	spin_unlock(&o2net_debug_lock);
	234	}
	235
	236	void o2net_debug_del_sc(struct o2net_sock_container *sc)
	237	{
	238	spin_lock(&o2net_debug_lock);
	239	list_del_init(&sc->sc_net_debug_item);
	240	spin_unlock(&o2net_debug_lock);
	241	}
	242
db02754c SM	243	struct o2net_sock_debug {
	244	int dbg_ctxt;
	245	struct o2net_sock_container *dbg_sock;
	246	};
	247
2309e9e0 SM	248	static struct o2net_sock_container
	249	next_sc(struct o2net_sock_container sc_start)
	250	{
	251	struct o2net_sock_container sc, ret = NULL;
	252
	253	assert_spin_locked(&o2net_debug_lock);
	254
	255	list_for_each_entry(sc, &sc_start->sc_net_debug_item,
	256	sc_net_debug_item) {
	257	/* discover the head of the list miscast as a sc */
	258	if (&sc->sc_net_debug_item == &sock_containers)
	259	break;
	260
	261	/* use sc_page to detect real scs in the list */
	262	if (sc->sc_page != NULL) {
	263	ret = sc;
	264	break;
	265	}
	266	}
	267
	268	return ret;
	269	}
	270
	271	static void sc_seq_start(struct seq_file seq, loff_t *pos)
	272	{
db02754c SM	273	struct o2net_sock_debug *sd = seq->private;
db02754c SM	274	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	275
	276	spin_lock(&o2net_debug_lock);
	277	sc = next_sc(dummy_sc);
	278	spin_unlock(&o2net_debug_lock);
	279
	280	return sc;
	281	}
	282
	283	static void sc_seq_next(struct seq_file seq, void v, loff_t pos)
	284	{
db02754c SM	285	struct o2net_sock_debug *sd = seq->private;
db02754c SM	286	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	287
	288	spin_lock(&o2net_debug_lock);
	289	sc = next_sc(dummy_sc);
	290	list_del_init(&dummy_sc->sc_net_debug_item);
	291	if (sc)
	292	list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
	293	spin_unlock(&o2net_debug_lock);
	294
	295	return sc; /* unused, just needs to be null when done */
	296	}
	297
db02754c SM	298	#ifdef CONFIG_OCFS2_FS_STATS
	299	# define sc_send_count(_s) ((_s)->sc_send_count)
	300	# define sc_recv_count(_s) ((_s)->sc_recv_count)
	301	# define sc_tv_acquiry_total_ns(_s) (ktime_to_ns((_s)->sc_tv_acquiry_total))
	302	# define sc_tv_send_total_ns(_s) (ktime_to_ns((_s)->sc_tv_send_total))
	303	# define sc_tv_status_total_ns(_s) (ktime_to_ns((_s)->sc_tv_status_total))
	304	# define sc_tv_process_total_ns(_s) (ktime_to_ns((_s)->sc_tv_process_total))
	305	#else
	306	# define sc_send_count(_s) (0U)
	307	# define sc_recv_count(_s) (0U)
	308	# define sc_tv_acquiry_total_ns(_s) (0LL)
	309	# define sc_tv_send_total_ns(_s) (0LL)
	310	# define sc_tv_status_total_ns(_s) (0LL)
	311	# define sc_tv_process_total_ns(_s) (0LL)
	312	#endif
	313
	314	/* So that debugfs.ocfs2 can determine which format is being used */
	315	#define O2NET_STATS_STR_VERSION 1
	316	static void sc_show_sock_stats(struct seq_file *seq,
	317	struct o2net_sock_container *sc)
2309e9e0	318	{
db02754c SM	319	if (!sc)
	320	return;
	321
	322	seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
	323	sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
	324	(long long)sc_tv_acquiry_total_ns(sc),
	325	(long long)sc_tv_send_total_ns(sc),
	326	(long long)sc_tv_status_total_ns(sc),
	327	(unsigned long)sc_recv_count(sc),
	328	(long long)sc_tv_process_total_ns(sc));
	329	}
2309e9e0	330
db02754c SM	331	static void sc_show_sock_container(struct seq_file *seq,
	332	struct o2net_sock_container *sc)
	333	{
	334	struct inet_sock *inet = NULL;
	335	__be32 saddr = 0, daddr = 0;
	336	__be16 sport = 0, dport = 0;
	337
	338	if (!sc)
	339	return;
	340
	341	if (sc->sc_sock) {
	342	inet = inet_sk(sc->sc_sock->sk);
	343	/* the stack's structs aren't sparse endian clean */
	344	saddr = (__force __be32)inet->inet_saddr;
	345	daddr = (__force __be32)inet->inet_daddr;
	346	sport = (__force __be16)inet->inet_sport;
	347	dport = (__force __be16)inet->inet_dport;
	348	}
2309e9e0	349
db02754c SM	350	/* XXX sigh, inet-> doesn't have sparse annotation so any
	351	* use of it here generates a warning with -Wbitwise */
	352	seq_printf(seq, "%p:\n"
	353	" krefs: %d\n"
	354	" sock: %pI4:%u -> "
	355	"%pI4:%u\n"
	356	" remote node: %s\n"
	357	" page off: %zu\n"
	358	" handshake ok: %u\n"
	359	" timer: %lld usecs\n"
	360	" data ready: %lld usecs\n"
	361	" advance start: %lld usecs\n"
	362	" advance stop: %lld usecs\n"
	363	" func start: %lld usecs\n"
	364	" func stop: %lld usecs\n"
	365	" func key: 0x%08x\n"
	366	" func type: %u\n",
	367	sc,
	368	atomic_read(&sc->sc_kref.refcount),
	369	&saddr, inet ? ntohs(sport) : 0,
	370	&daddr, inet ? ntohs(dport) : 0,
	371	sc->sc_node->nd_name,
	372	sc->sc_page_off,
	373	sc->sc_handshake_ok,
	374	(long long)ktime_to_us(sc->sc_tv_timer),
	375	(long long)ktime_to_us(sc->sc_tv_data_ready),
	376	(long long)ktime_to_us(sc->sc_tv_advance_start),
	377	(long long)ktime_to_us(sc->sc_tv_advance_stop),
	378	(long long)ktime_to_us(sc->sc_tv_func_start),
	379	(long long)ktime_to_us(sc->sc_tv_func_stop),
	380	sc->sc_msg_key,
	381	sc->sc_msg_type);
	382	}
2309e9e0	383
db02754c SM	384	static int sc_seq_show(struct seq_file seq, void v)
	385	{
	386	struct o2net_sock_debug *sd = seq->private;
	387	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0	388
db02754c SM	389	spin_lock(&o2net_debug_lock);
db02754c SM	390	sc = next_sc(dummy_sc);
2309e9e0	391
db02754c SM	392	if (sc) {
	393	if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
	394	sc_show_sock_container(seq, sc);
	395	else
	396	sc_show_sock_stats(seq, sc);
2309e9e0 SM	397	}
2309e9e0 SM	398
2309e9e0 SM	399	spin_unlock(&o2net_debug_lock);
	400
	401	return 0;
	402	}
	403
	404	static void sc_seq_stop(struct seq_file seq, void v)
	405	{
	406	}
	407
88e9d34c	408	static const struct seq_operations sc_seq_ops = {
2309e9e0 SM	409	.start = sc_seq_start,
	410	.next = sc_seq_next,
	411	.stop = sc_seq_stop,
	412	.show = sc_seq_show,
	413	};
	414
db02754c	415	static int sc_common_open(struct file file, struct o2net_sock_debug sd)
2309e9e0 SM	416	{
	417	struct o2net_sock_container *dummy_sc;
	418	struct seq_file *seq;
	419	int ret;
	420
	421	dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
	422	if (dummy_sc == NULL) {
	423	ret = -ENOMEM;
	424	goto out;
	425	}
	426	dummy_sc->sc_page = NULL;
	427
	428	ret = seq_open(file, &sc_seq_ops);
	429	if (ret)
	430	goto out;
	431
	432	seq = file->private_data;
db02754c SM	433	seq->private = sd;
db02754c SM	434	sd->dbg_sock = dummy_sc;
2309e9e0 SM	435	o2net_debug_add_sc(dummy_sc);
	436
	437	dummy_sc = NULL;
	438
	439	out:
	440	kfree(dummy_sc);
	441	return ret;
	442	}
	443
	444	static int sc_fop_release(struct inode inode, struct file file)
	445	{
	446	struct seq_file *seq = file->private_data;
db02754c SM	447	struct o2net_sock_debug *sd = seq->private;
db02754c SM	448	struct o2net_sock_container *dummy_sc = sd->dbg_sock;
2309e9e0 SM	449
	450	o2net_debug_del_sc(dummy_sc);
	451	return seq_release_private(inode, file);
	452	}
	453
db02754c SM	454	static int stats_fop_open(struct inode inode, struct file file)
	455	{
	456	struct o2net_sock_debug *sd;
	457
	458	sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
	459	if (sd == NULL)
	460	return -ENOMEM;
	461
	462	sd->dbg_ctxt = SHOW_SOCK_STATS;
	463	sd->dbg_sock = NULL;
	464
	465	return sc_common_open(file, sd);
	466	}
	467
	468	static const struct file_operations stats_seq_fops = {
	469	.open = stats_fop_open,
	470	.read = seq_read,
	471	.llseek = seq_lseek,
	472	.release = sc_fop_release,
	473	};
	474
	475	static int sc_fop_open(struct inode inode, struct file file)
	476	{
	477	struct o2net_sock_debug *sd;
	478
	479	sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
	480	if (sd == NULL)
	481	return -ENOMEM;
	482
	483	sd->dbg_ctxt = SHOW_SOCK_CONTAINERS;
	484	sd->dbg_sock = NULL;
	485
	486	return sc_common_open(file, sd);
	487	}
	488
828c0950	489	static const struct file_operations sc_seq_fops = {
2309e9e0 SM	490	.open = sc_fop_open,
	491	.read = seq_read,
	492	.llseek = seq_lseek,
	493	.release = sc_fop_release,
	494	};
	495
3ba169cc	496	static int o2net_fill_bitmap(char *buf, int len)
2309e9e0	497	{
3ba169cc SM	498	unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
3ba169cc SM	499	int i = -1, out = 0;
2309e9e0	500
3ba169cc	501	o2net_fill_node_map(map, sizeof(map));
2309e9e0	502
3ba169cc SM	503	while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
	504	out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
	505	out += snprintf(buf + out, PAGE_SIZE - out, "\n");
2309e9e0	506
3ba169cc SM	507	return out;
	508	}
	509
	510	static int nodes_fop_open(struct inode inode, struct file file)
	511	{
	512	char *buf;
	513
	514	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	515	if (!buf)
	516	return -ENOMEM;
	517
	518	i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
	519
	520	file->private_data = buf;
db02754c	521
2309e9e0	522	return 0;
2309e9e0 SM	523	}
2309e9e0 SM	524
3ba169cc SM	525	static int o2net_debug_release(struct inode inode, struct file file)
	526	{
	527	kfree(file->private_data);
	528	return 0;
	529	}
	530
	531	static ssize_t o2net_debug_read(struct file file, char __user buf,
	532	size_t nbytes, loff_t *ppos)
	533	{
	534	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
	535	i_size_read(file->f_mapping->host));
	536	}
	537
	538	static const struct file_operations nodes_fops = {
	539	.open = nodes_fop_open,
	540	.release = o2net_debug_release,
	541	.read = o2net_debug_read,
	542	.llseek = generic_file_llseek,
	543	};
	544
2309e9e0 SM	545	void o2net_debugfs_exit(void)
2309e9e0 SM	546	{
3ba169cc	547	debugfs_remove(nodes_dentry);
db02754c	548	debugfs_remove(stats_dentry);
37096a79 SM	549	debugfs_remove(sc_dentry);
	550	debugfs_remove(nst_dentry);
	551	debugfs_remove(o2net_dentry);
2309e9e0 SM	552	}
2309e9e0 SM	553
3ba169cc SM	554	int o2net_debugfs_init(void)
3ba169cc SM	555	{
f4ae40a6	556	umode_t mode = S_IFREG\|S_IRUSR;
3ba169cc SM	557
	558	o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
	559	if (o2net_dentry)
	560	nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
	561	o2net_dentry, NULL, &nst_seq_fops);
	562	if (nst_dentry)
	563	sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
	564	o2net_dentry, NULL, &sc_seq_fops);
	565	if (sc_dentry)
	566	stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
	567	o2net_dentry, NULL, &stats_seq_fops);
	568	if (stats_dentry)
	569	nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
	570	o2net_dentry, NULL, &nodes_fops);
	571	if (nodes_dentry)
	572	return 0;
	573
	574	o2net_debugfs_exit();
	575	mlog_errno(-ENOMEM);
	576	return -ENOMEM;
	577	}
	578
2309e9e0	579	#endif /* CONFIG_DEBUG_FS */