[linux-2.6-block.git] / fs / ocfs2 / cluster / netdebug.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* -*- 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.
 */

#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 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_recursive(o2net_dentry);
}

void o2net_debugfs_init(void)
{
	umode_t mode = S_IFREG|S_IRUSR;

	o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);

	debugfs_create_file(NST_DEBUG_NAME, mode, o2net_dentry, NULL,
			    &nst_seq_fops);
	debugfs_create_file(SC_DEBUG_NAME, mode, o2net_dentry, NULL,
			    &sc_seq_fops);
	debugfs_create_file(STATS_DEBUG_NAME, mode, o2net_dentry, NULL,
			    &stats_seq_fops);
	debugfs_create_file(NODES_DEBUG_NAME, mode, o2net_dentry, NULL,
			    &nodes_fops);
}

#endif	/* CONFIG_DEBUG_FS */
Commit	Line	Data
328970de	1	// SPDX-License-Identifier: GPL-2.0-or-later
2309e9e0 SM	2	/* -- mode: c; c-basic-offset: 8; --
	3	* vim: noexpandtab sw=8 ts=8 sts=0:
	4	*
	5	* netdebug.c
	6	*
	7	* debug functionality for o2net
	8	*
	9	* Copyright (C) 2005, 2008 Oracle. All rights reserved.
2309e9e0 SM	10	*/
	11
	12	#ifdef CONFIG_DEBUG_FS
	13
	14	#include <linux/module.h>
	15	#include <linux/types.h>
	16	#include <linux/slab.h>
	17	#include <linux/idr.h>
	18	#include <linux/kref.h>
	19	#include <linux/seq_file.h>
	20	#include <linux/debugfs.h>
	21
	22	#include <linux/uaccess.h>
	23
	24	#include "tcp.h"
	25	#include "nodemanager.h"
	26	#define MLOG_MASK_PREFIX ML_TCP
	27	#include "masklog.h"
	28
	29	#include "tcp_internal.h"
	30
	31	#define O2NET_DEBUG_DIR "o2net"
	32	#define SC_DEBUG_NAME "sock_containers"
	33	#define NST_DEBUG_NAME "send_tracking"
db02754c	34	#define STATS_DEBUG_NAME "stats"
3ba169cc	35	#define NODES_DEBUG_NAME "connected_nodes"
db02754c SM	36
	37	#define SHOW_SOCK_CONTAINERS 0
	38	#define SHOW_SOCK_STATS 1
2309e9e0 SM	39
2309e9e0 SM	40	static struct dentry *o2net_dentry;
2309e9e0 SM	41
	42	static DEFINE_SPINLOCK(o2net_debug_lock);
	43
	44	static LIST_HEAD(sock_containers);
	45	static LIST_HEAD(send_tracking);
	46
	47	void o2net_debug_add_nst(struct o2net_send_tracking *nst)
	48	{
	49	spin_lock(&o2net_debug_lock);
	50	list_add(&nst->st_net_debug_item, &send_tracking);
	51	spin_unlock(&o2net_debug_lock);
	52	}
	53
	54	void o2net_debug_del_nst(struct o2net_send_tracking *nst)
	55	{
	56	spin_lock(&o2net_debug_lock);
	57	if (!list_empty(&nst->st_net_debug_item))
	58	list_del_init(&nst->st_net_debug_item);
	59	spin_unlock(&o2net_debug_lock);
	60	}
	61
	62	static struct o2net_send_tracking
	63	next_nst(struct o2net_send_tracking nst_start)
	64	{
	65	struct o2net_send_tracking nst, ret = NULL;
	66
	67	assert_spin_locked(&o2net_debug_lock);
	68
	69	list_for_each_entry(nst, &nst_start->st_net_debug_item,
	70	st_net_debug_item) {
	71	/* discover the head of the list */
	72	if (&nst->st_net_debug_item == &send_tracking)
	73	break;
	74
	75	/* use st_task to detect real nsts in the list */
	76	if (nst->st_task != NULL) {
	77	ret = nst;
	78	break;
	79	}
	80	}
	81
	82	return ret;
	83	}
	84
	85	static void nst_seq_start(struct seq_file seq, loff_t *pos)
	86	{
	87	struct o2net_send_tracking nst, dummy_nst = seq->private;
	88
	89	spin_lock(&o2net_debug_lock);
	90	nst = next_nst(dummy_nst);
	91	spin_unlock(&o2net_debug_lock);
	92
	93	return nst;
	94	}
	95
	96	static void nst_seq_next(struct seq_file seq, void v, loff_t pos)
	97	{
	98	struct o2net_send_tracking nst, dummy_nst = seq->private;
	99
	100	spin_lock(&o2net_debug_lock);
	101	nst = next_nst(dummy_nst);
	102	list_del_init(&dummy_nst->st_net_debug_item);
	103	if (nst)
	104	list_add(&dummy_nst->st_net_debug_item,
105	&nst->st_net_debug_item);
106	spin_unlock(&o2net_debug_lock);
107
108	return nst; /* unused, just needs to be null when done */
109	}
110
111	static int nst_seq_show(struct seq_file seq, void v)
112	{
113	struct o2net_send_tracking nst, dummy_nst = seq->private;
3f9c14fa SM	114	ktime_t now;
3f9c14fa SM	115	s64 sock, send, status;
2309e9e0 SM	116
	117	spin_lock(&o2net_debug_lock);
	118	nst = next_nst(dummy_nst);
cc548166 DC	119	if (!nst)
cc548166 DC	120	goto out;
2309e9e0	121
3f9c14fa SM	122	now = ktime_get();
	123	sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
	124	send = ktime_to_us(ktime_sub(now, nst->st_send_time));
	125	status = ktime_to_us(ktime_sub(now, nst->st_status_time));
	126
cc548166 DC	127	/* get_task_comm isn't exported. oh well. */
	128	seq_printf(seq, "%p:\n"
	129	" pid: %lu\n"
	130	" tgid: %lu\n"
	131	" process name: %s\n"
	132	" node: %u\n"
	133	" sc: %p\n"
	134	" message id: %d\n"
	135	" message type: %u\n"
	136	" message key: 0x%08x\n"
	137	" sock acquiry: %lld usecs ago\n"
	138	" send start: %lld usecs ago\n"
	139	" wait start: %lld usecs ago\n",
	140	nst, (unsigned long)task_pid_nr(nst->st_task),
	141	(unsigned long)nst->st_task->tgid,
	142	nst->st_task->comm, nst->st_node,
	143	nst->st_sc, nst->st_id, nst->st_msg_type,
	144	nst->st_msg_key,
	145	(long long)sock,
	146	(long long)send,
	147	(long long)status);
2309e9e0	148
cc548166	149	out:
2309e9e0 SM	150	spin_unlock(&o2net_debug_lock);
	151
	152	return 0;
	153	}
	154
	155	static void nst_seq_stop(struct seq_file seq, void v)
	156	{
	157	}
	158
88e9d34c	159	static const struct seq_operations nst_seq_ops = {
2309e9e0 SM	160	.start = nst_seq_start,
	161	.next = nst_seq_next,
	162	.stop = nst_seq_stop,
	163	.show = nst_seq_show,
	164	};
	165
	166	static int nst_fop_open(struct inode inode, struct file file)
	167	{
	168	struct o2net_send_tracking *dummy_nst;
2309e9e0	169
f3288338 RJ	170	dummy_nst = __seq_open_private(file, &nst_seq_ops, sizeof(*dummy_nst));
	171	if (!dummy_nst)
	172	return -ENOMEM;
2309e9e0 SM	173	o2net_debug_add_nst(dummy_nst);
2309e9e0 SM	174
f3288338	175	return 0;
2309e9e0 SM	176	}
	177
	178	static int nst_fop_release(struct inode inode, struct file file)
	179	{
	180	struct seq_file *seq = file->private_data;
	181	struct o2net_send_tracking *dummy_nst = seq->private;
	182
	183	o2net_debug_del_nst(dummy_nst);
	184	return seq_release_private(inode, file);
	185	}
	186
828c0950	187	static const struct file_operations nst_seq_fops = {
2309e9e0 SM	188	.open = nst_fop_open,
	189	.read = seq_read,
	190	.llseek = seq_lseek,
	191	.release = nst_fop_release,
	192	};
	193
	194	void o2net_debug_add_sc(struct o2net_sock_container *sc)
	195	{
	196	spin_lock(&o2net_debug_lock);
	197	list_add(&sc->sc_net_debug_item, &sock_containers);
	198	spin_unlock(&o2net_debug_lock);
	199	}
	200
	201	void o2net_debug_del_sc(struct o2net_sock_container *sc)
	202	{
	203	spin_lock(&o2net_debug_lock);
	204	list_del_init(&sc->sc_net_debug_item);
	205	spin_unlock(&o2net_debug_lock);
	206	}
	207
db02754c SM	208	struct o2net_sock_debug {
	209	int dbg_ctxt;
	210	struct o2net_sock_container *dbg_sock;
	211	};
	212
2309e9e0 SM	213	static struct o2net_sock_container
	214	next_sc(struct o2net_sock_container sc_start)
	215	{
	216	struct o2net_sock_container sc, ret = NULL;
	217
	218	assert_spin_locked(&o2net_debug_lock);
	219
	220	list_for_each_entry(sc, &sc_start->sc_net_debug_item,
	221	sc_net_debug_item) {
	222	/* discover the head of the list miscast as a sc */
	223	if (&sc->sc_net_debug_item == &sock_containers)
	224	break;
	225
	226	/* use sc_page to detect real scs in the list */
	227	if (sc->sc_page != NULL) {
	228	ret = sc;
	229	break;
	230	}
	231	}
	232
	233	return ret;
	234	}
	235
	236	static void sc_seq_start(struct seq_file seq, loff_t *pos)
	237	{
db02754c SM	238	struct o2net_sock_debug *sd = seq->private;
db02754c SM	239	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	240
	241	spin_lock(&o2net_debug_lock);
	242	sc = next_sc(dummy_sc);
	243	spin_unlock(&o2net_debug_lock);
	244
	245	return sc;
	246	}
	247
	248	static void sc_seq_next(struct seq_file seq, void v, loff_t pos)
	249	{
db02754c SM	250	struct o2net_sock_debug *sd = seq->private;
db02754c SM	251	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	252
	253	spin_lock(&o2net_debug_lock);
	254	sc = next_sc(dummy_sc);
	255	list_del_init(&dummy_sc->sc_net_debug_item);
	256	if (sc)
	257	list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
	258	spin_unlock(&o2net_debug_lock);
	259
	260	return sc; /* unused, just needs to be null when done */
	261	}
	262
db02754c SM	263	#ifdef CONFIG_OCFS2_FS_STATS
	264	# define sc_send_count(_s) ((_s)->sc_send_count)
	265	# define sc_recv_count(_s) ((_s)->sc_recv_count)
	266	# define sc_tv_acquiry_total_ns(_s) (ktime_to_ns((_s)->sc_tv_acquiry_total))
	267	# define sc_tv_send_total_ns(_s) (ktime_to_ns((_s)->sc_tv_send_total))
	268	# define sc_tv_status_total_ns(_s) (ktime_to_ns((_s)->sc_tv_status_total))
	269	# define sc_tv_process_total_ns(_s) (ktime_to_ns((_s)->sc_tv_process_total))
	270	#else
	271	# define sc_send_count(_s) (0U)
	272	# define sc_recv_count(_s) (0U)
	273	# define sc_tv_acquiry_total_ns(_s) (0LL)
	274	# define sc_tv_send_total_ns(_s) (0LL)
	275	# define sc_tv_status_total_ns(_s) (0LL)
	276	# define sc_tv_process_total_ns(_s) (0LL)
	277	#endif
	278
	279	/* So that debugfs.ocfs2 can determine which format is being used */
	280	#define O2NET_STATS_STR_VERSION 1
	281	static void sc_show_sock_stats(struct seq_file *seq,
	282	struct o2net_sock_container *sc)
2309e9e0	283	{
db02754c SM	284	if (!sc)
	285	return;
	286
	287	seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
	288	sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
	289	(long long)sc_tv_acquiry_total_ns(sc),
	290	(long long)sc_tv_send_total_ns(sc),
	291	(long long)sc_tv_status_total_ns(sc),
	292	(unsigned long)sc_recv_count(sc),
	293	(long long)sc_tv_process_total_ns(sc));
	294	}
2309e9e0	295
db02754c SM	296	static void sc_show_sock_container(struct seq_file *seq,
	297	struct o2net_sock_container *sc)
	298	{
	299	struct inet_sock *inet = NULL;
	300	__be32 saddr = 0, daddr = 0;
	301	__be16 sport = 0, dport = 0;
	302
	303	if (!sc)
	304	return;
	305
	306	if (sc->sc_sock) {
	307	inet = inet_sk(sc->sc_sock->sk);
	308	/* the stack's structs aren't sparse endian clean */
	309	saddr = (__force __be32)inet->inet_saddr;
	310	daddr = (__force __be32)inet->inet_daddr;
	311	sport = (__force __be16)inet->inet_sport;
	312	dport = (__force __be16)inet->inet_dport;
	313	}
2309e9e0	314
db02754c SM	315	/* XXX sigh, inet-> doesn't have sparse annotation so any
	316	* use of it here generates a warning with -Wbitwise */
	317	seq_printf(seq, "%p:\n"
	318	" krefs: %d\n"
	319	" sock: %pI4:%u -> "
	320	"%pI4:%u\n"
	321	" remote node: %s\n"
	322	" page off: %zu\n"
	323	" handshake ok: %u\n"
	324	" timer: %lld usecs\n"
	325	" data ready: %lld usecs\n"
	326	" advance start: %lld usecs\n"
	327	" advance stop: %lld usecs\n"
	328	" func start: %lld usecs\n"
	329	" func stop: %lld usecs\n"
	330	" func key: 0x%08x\n"
	331	" func type: %u\n",
	332	sc,
2c935bc5	333	kref_read(&sc->sc_kref),
db02754c SM	334	&saddr, inet ? ntohs(sport) : 0,
	335	&daddr, inet ? ntohs(dport) : 0,
	336	sc->sc_node->nd_name,
	337	sc->sc_page_off,
	338	sc->sc_handshake_ok,
	339	(long long)ktime_to_us(sc->sc_tv_timer),
	340	(long long)ktime_to_us(sc->sc_tv_data_ready),
	341	(long long)ktime_to_us(sc->sc_tv_advance_start),
	342	(long long)ktime_to_us(sc->sc_tv_advance_stop),
	343	(long long)ktime_to_us(sc->sc_tv_func_start),
	344	(long long)ktime_to_us(sc->sc_tv_func_stop),
	345	sc->sc_msg_key,
	346	sc->sc_msg_type);
	347	}
2309e9e0	348
db02754c SM	349	static int sc_seq_show(struct seq_file seq, void v)
	350	{
	351	struct o2net_sock_debug *sd = seq->private;
	352	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0	353
db02754c SM	354	spin_lock(&o2net_debug_lock);
db02754c SM	355	sc = next_sc(dummy_sc);
2309e9e0	356
db02754c SM	357	if (sc) {
	358	if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
	359	sc_show_sock_container(seq, sc);
	360	else
	361	sc_show_sock_stats(seq, sc);
2309e9e0 SM	362	}
2309e9e0 SM	363
2309e9e0 SM	364	spin_unlock(&o2net_debug_lock);
	365
	366	return 0;
	367	}
	368
	369	static void sc_seq_stop(struct seq_file seq, void v)
	370	{
	371	}
	372
88e9d34c	373	static const struct seq_operations sc_seq_ops = {
2309e9e0 SM	374	.start = sc_seq_start,
	375	.next = sc_seq_next,
	376	.stop = sc_seq_stop,
	377	.show = sc_seq_show,
	378	};
	379
f3288338	380	static int sc_common_open(struct file *file, int ctxt)
2309e9e0	381	{
f3288338	382	struct o2net_sock_debug *sd;
2309e9e0	383	struct o2net_sock_container *dummy_sc;
2309e9e0	384
f3288338 RJ	385	dummy_sc = kzalloc(sizeof(*dummy_sc), GFP_KERNEL);
	386	if (!dummy_sc)
	387	return -ENOMEM;
2309e9e0	388
f3288338 RJ	389	sd = __seq_open_private(file, &sc_seq_ops, sizeof(*sd));
	390	if (!sd) {
	391	kfree(dummy_sc);
	392	return -ENOMEM;
	393	}
2309e9e0	394
f3288338	395	sd->dbg_ctxt = ctxt;
db02754c	396	sd->dbg_sock = dummy_sc;
2309e9e0	397
f3288338	398	o2net_debug_add_sc(dummy_sc);
2309e9e0	399
f3288338	400	return 0;
2309e9e0 SM	401	}
	402
	403	static int sc_fop_release(struct inode inode, struct file file)
	404	{
	405	struct seq_file *seq = file->private_data;
db02754c SM	406	struct o2net_sock_debug *sd = seq->private;
db02754c SM	407	struct o2net_sock_container *dummy_sc = sd->dbg_sock;
2309e9e0 SM	408
2309e9e0 SM	409	o2net_debug_del_sc(dummy_sc);
25b1c72e	410	kfree(dummy_sc);
2309e9e0 SM	411	return seq_release_private(inode, file);
	412	}
	413
db02754c SM	414	static int stats_fop_open(struct inode inode, struct file file)
db02754c SM	415	{
f3288338	416	return sc_common_open(file, SHOW_SOCK_STATS);
db02754c SM	417	}
	418
	419	static const struct file_operations stats_seq_fops = {
	420	.open = stats_fop_open,
	421	.read = seq_read,
	422	.llseek = seq_lseek,
	423	.release = sc_fop_release,
	424	};
	425
	426	static int sc_fop_open(struct inode inode, struct file file)
	427	{
f3288338	428	return sc_common_open(file, SHOW_SOCK_CONTAINERS);
db02754c SM	429	}
db02754c SM	430
828c0950	431	static const struct file_operations sc_seq_fops = {
2309e9e0 SM	432	.open = sc_fop_open,
	433	.read = seq_read,
	434	.llseek = seq_lseek,
	435	.release = sc_fop_release,
	436	};
	437
3ba169cc	438	static int o2net_fill_bitmap(char *buf, int len)
2309e9e0	439	{
3ba169cc SM	440	unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
3ba169cc SM	441	int i = -1, out = 0;
2309e9e0	442
3ba169cc	443	o2net_fill_node_map(map, sizeof(map));
2309e9e0	444
3ba169cc SM	445	while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
	446	out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
	447	out += snprintf(buf + out, PAGE_SIZE - out, "\n");
2309e9e0	448
3ba169cc SM	449	return out;
	450	}
	451
	452	static int nodes_fop_open(struct inode inode, struct file file)
	453	{
	454	char *buf;
	455
	456	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	457	if (!buf)
	458	return -ENOMEM;
	459
	460	i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
	461
	462	file->private_data = buf;
db02754c	463
2309e9e0	464	return 0;
2309e9e0 SM	465	}
2309e9e0 SM	466
3ba169cc SM	467	static int o2net_debug_release(struct inode inode, struct file file)
	468	{
	469	kfree(file->private_data);
	470	return 0;
	471	}
	472
	473	static ssize_t o2net_debug_read(struct file file, char __user buf,
	474	size_t nbytes, loff_t *ppos)
	475	{
	476	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
	477	i_size_read(file->f_mapping->host));
	478	}
	479
	480	static const struct file_operations nodes_fops = {
	481	.open = nodes_fop_open,
	482	.release = o2net_debug_release,
	483	.read = o2net_debug_read,
	484	.llseek = generic_file_llseek,
	485	};
	486
2309e9e0 SM	487	void o2net_debugfs_exit(void)
2309e9e0 SM	488	{
e581595e	489	debugfs_remove_recursive(o2net_dentry);
2309e9e0 SM	490	}
2309e9e0 SM	491
e581595e	492	void o2net_debugfs_init(void)
3ba169cc	493	{
f4ae40a6	494	umode_t mode = S_IFREG\|S_IRUSR;
3ba169cc SM	495
3ba169cc SM	496	o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
e581595e GKH	497
	498	debugfs_create_file(NST_DEBUG_NAME, mode, o2net_dentry, NULL,
	499	&nst_seq_fops);
	500	debugfs_create_file(SC_DEBUG_NAME, mode, o2net_dentry, NULL,
	501	&sc_seq_fops);
	502	debugfs_create_file(STATS_DEBUG_NAME, mode, o2net_dentry, NULL,
	503	&stats_seq_fops);
	504	debugfs_create_file(NODES_DEBUG_NAME, mode, o2net_dentry, NULL,
	505	&nodes_fops);
3ba169cc SM	506	}
3ba169cc SM	507
2309e9e0	508	#endif /* CONFIG_DEBUG_FS */