[mirror_ubuntu-jammy-kernel.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 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 */
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
	40	static struct dentry *o2net_dentry;
	41	static struct dentry *sc_dentry;
	42	static struct dentry *nst_dentry;
db02754c	43	static struct dentry *stats_dentry;
3ba169cc	44	static struct dentry *nodes_dentry;
2309e9e0 SM	45
	46	static DEFINE_SPINLOCK(o2net_debug_lock);
	47
	48	static LIST_HEAD(sock_containers);
	49	static LIST_HEAD(send_tracking);
	50
	51	void o2net_debug_add_nst(struct o2net_send_tracking *nst)
	52	{
	53	spin_lock(&o2net_debug_lock);
	54	list_add(&nst->st_net_debug_item, &send_tracking);
	55	spin_unlock(&o2net_debug_lock);
	56	}
	57
	58	void o2net_debug_del_nst(struct o2net_send_tracking *nst)
	59	{
	60	spin_lock(&o2net_debug_lock);
	61	if (!list_empty(&nst->st_net_debug_item))
	62	list_del_init(&nst->st_net_debug_item);
	63	spin_unlock(&o2net_debug_lock);
	64	}
	65
	66	static struct o2net_send_tracking
	67	next_nst(struct o2net_send_tracking nst_start)
	68	{
	69	struct o2net_send_tracking nst, ret = NULL;
	70
	71	assert_spin_locked(&o2net_debug_lock);
	72
	73	list_for_each_entry(nst, &nst_start->st_net_debug_item,
	74	st_net_debug_item) {
	75	/* discover the head of the list */
	76	if (&nst->st_net_debug_item == &send_tracking)
	77	break;
	78
	79	/* use st_task to detect real nsts in the list */
	80	if (nst->st_task != NULL) {
	81	ret = nst;
	82	break;
	83	}
	84	}
	85
	86	return ret;
	87	}
	88
	89	static void nst_seq_start(struct seq_file seq, loff_t *pos)
	90	{
	91	struct o2net_send_tracking nst, dummy_nst = seq->private;
	92
	93	spin_lock(&o2net_debug_lock);
	94	nst = next_nst(dummy_nst);
	95	spin_unlock(&o2net_debug_lock);
	96
	97	return nst;
	98	}
	99
	100	static void nst_seq_next(struct seq_file seq, void v, loff_t pos)
	101	{
	102	struct o2net_send_tracking nst, dummy_nst = seq->private;
	103
	104	spin_lock(&o2net_debug_lock);
	105	nst = next_nst(dummy_nst);
	106	list_del_init(&dummy_nst->st_net_debug_item);
	107	if (nst)
	108	list_add(&dummy_nst->st_net_debug_item,
109	&nst->st_net_debug_item);
110	spin_unlock(&o2net_debug_lock);
111
112	return nst; /* unused, just needs to be null when done */
113	}
114
115	static int nst_seq_show(struct seq_file seq, void v)
116	{
117	struct o2net_send_tracking nst, dummy_nst = seq->private;
3f9c14fa SM	118	ktime_t now;
3f9c14fa SM	119	s64 sock, send, status;
2309e9e0 SM	120
	121	spin_lock(&o2net_debug_lock);
	122	nst = next_nst(dummy_nst);
cc548166 DC	123	if (!nst)
cc548166 DC	124	goto out;
2309e9e0	125
3f9c14fa SM	126	now = ktime_get();
	127	sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
	128	send = ktime_to_us(ktime_sub(now, nst->st_send_time));
	129	status = ktime_to_us(ktime_sub(now, nst->st_status_time));
	130
cc548166 DC	131	/* get_task_comm isn't exported. oh well. */
	132	seq_printf(seq, "%p:\n"
	133	" pid: %lu\n"
	134	" tgid: %lu\n"
	135	" process name: %s\n"
	136	" node: %u\n"
	137	" sc: %p\n"
	138	" message id: %d\n"
	139	" message type: %u\n"
	140	" message key: 0x%08x\n"
	141	" sock acquiry: %lld usecs ago\n"
	142	" send start: %lld usecs ago\n"
	143	" wait start: %lld usecs ago\n",
	144	nst, (unsigned long)task_pid_nr(nst->st_task),
	145	(unsigned long)nst->st_task->tgid,
	146	nst->st_task->comm, nst->st_node,
	147	nst->st_sc, nst->st_id, nst->st_msg_type,
	148	nst->st_msg_key,
	149	(long long)sock,
	150	(long long)send,
	151	(long long)status);
2309e9e0	152
cc548166	153	out:
2309e9e0 SM	154	spin_unlock(&o2net_debug_lock);
	155
	156	return 0;
	157	}
	158
	159	static void nst_seq_stop(struct seq_file seq, void v)
	160	{
	161	}
	162
88e9d34c	163	static const struct seq_operations nst_seq_ops = {
2309e9e0 SM	164	.start = nst_seq_start,
	165	.next = nst_seq_next,
	166	.stop = nst_seq_stop,
	167	.show = nst_seq_show,
	168	};
	169
	170	static int nst_fop_open(struct inode inode, struct file file)
	171	{
	172	struct o2net_send_tracking *dummy_nst;
2309e9e0	173
f3288338 RJ	174	dummy_nst = __seq_open_private(file, &nst_seq_ops, sizeof(*dummy_nst));
	175	if (!dummy_nst)
	176	return -ENOMEM;
2309e9e0 SM	177	o2net_debug_add_nst(dummy_nst);
2309e9e0 SM	178
f3288338	179	return 0;
2309e9e0 SM	180	}
	181
	182	static int nst_fop_release(struct inode inode, struct file file)
	183	{
	184	struct seq_file *seq = file->private_data;
	185	struct o2net_send_tracking *dummy_nst = seq->private;
	186
	187	o2net_debug_del_nst(dummy_nst);
	188	return seq_release_private(inode, file);
	189	}
	190
828c0950	191	static const struct file_operations nst_seq_fops = {
2309e9e0 SM	192	.open = nst_fop_open,
	193	.read = seq_read,
	194	.llseek = seq_lseek,
	195	.release = nst_fop_release,
	196	};
	197
	198	void o2net_debug_add_sc(struct o2net_sock_container *sc)
	199	{
	200	spin_lock(&o2net_debug_lock);
	201	list_add(&sc->sc_net_debug_item, &sock_containers);
	202	spin_unlock(&o2net_debug_lock);
	203	}
	204
	205	void o2net_debug_del_sc(struct o2net_sock_container *sc)
	206	{
	207	spin_lock(&o2net_debug_lock);
	208	list_del_init(&sc->sc_net_debug_item);
	209	spin_unlock(&o2net_debug_lock);
	210	}
	211
db02754c SM	212	struct o2net_sock_debug {
	213	int dbg_ctxt;
	214	struct o2net_sock_container *dbg_sock;
	215	};
	216
2309e9e0 SM	217	static struct o2net_sock_container
	218	next_sc(struct o2net_sock_container sc_start)
	219	{
	220	struct o2net_sock_container sc, ret = NULL;
	221
	222	assert_spin_locked(&o2net_debug_lock);
	223
	224	list_for_each_entry(sc, &sc_start->sc_net_debug_item,
	225	sc_net_debug_item) {
	226	/* discover the head of the list miscast as a sc */
	227	if (&sc->sc_net_debug_item == &sock_containers)
	228	break;
	229
	230	/* use sc_page to detect real scs in the list */
	231	if (sc->sc_page != NULL) {
	232	ret = sc;
	233	break;
	234	}
	235	}
	236
	237	return ret;
	238	}
	239
	240	static void sc_seq_start(struct seq_file seq, loff_t *pos)
	241	{
db02754c SM	242	struct o2net_sock_debug *sd = seq->private;
db02754c SM	243	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	244
	245	spin_lock(&o2net_debug_lock);
	246	sc = next_sc(dummy_sc);
	247	spin_unlock(&o2net_debug_lock);
	248
	249	return sc;
	250	}
	251
	252	static void sc_seq_next(struct seq_file seq, void v, loff_t pos)
	253	{
db02754c SM	254	struct o2net_sock_debug *sd = seq->private;
db02754c SM	255	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0 SM	256
	257	spin_lock(&o2net_debug_lock);
	258	sc = next_sc(dummy_sc);
	259	list_del_init(&dummy_sc->sc_net_debug_item);
	260	if (sc)
	261	list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
	262	spin_unlock(&o2net_debug_lock);
	263
	264	return sc; /* unused, just needs to be null when done */
	265	}
	266
db02754c SM	267	#ifdef CONFIG_OCFS2_FS_STATS
	268	# define sc_send_count(_s) ((_s)->sc_send_count)
	269	# define sc_recv_count(_s) ((_s)->sc_recv_count)
	270	# define sc_tv_acquiry_total_ns(_s) (ktime_to_ns((_s)->sc_tv_acquiry_total))
	271	# define sc_tv_send_total_ns(_s) (ktime_to_ns((_s)->sc_tv_send_total))
	272	# define sc_tv_status_total_ns(_s) (ktime_to_ns((_s)->sc_tv_status_total))
	273	# define sc_tv_process_total_ns(_s) (ktime_to_ns((_s)->sc_tv_process_total))
	274	#else
	275	# define sc_send_count(_s) (0U)
	276	# define sc_recv_count(_s) (0U)
	277	# define sc_tv_acquiry_total_ns(_s) (0LL)
	278	# define sc_tv_send_total_ns(_s) (0LL)
	279	# define sc_tv_status_total_ns(_s) (0LL)
	280	# define sc_tv_process_total_ns(_s) (0LL)
	281	#endif
	282
	283	/* So that debugfs.ocfs2 can determine which format is being used */
	284	#define O2NET_STATS_STR_VERSION 1
	285	static void sc_show_sock_stats(struct seq_file *seq,
	286	struct o2net_sock_container *sc)
2309e9e0	287	{
db02754c SM	288	if (!sc)
	289	return;
	290
	291	seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
	292	sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
	293	(long long)sc_tv_acquiry_total_ns(sc),
	294	(long long)sc_tv_send_total_ns(sc),
	295	(long long)sc_tv_status_total_ns(sc),
	296	(unsigned long)sc_recv_count(sc),
	297	(long long)sc_tv_process_total_ns(sc));
	298	}
2309e9e0	299
db02754c SM	300	static void sc_show_sock_container(struct seq_file *seq,
	301	struct o2net_sock_container *sc)
	302	{
	303	struct inet_sock *inet = NULL;
	304	__be32 saddr = 0, daddr = 0;
	305	__be16 sport = 0, dport = 0;
	306
	307	if (!sc)
	308	return;
	309
	310	if (sc->sc_sock) {
	311	inet = inet_sk(sc->sc_sock->sk);
	312	/* the stack's structs aren't sparse endian clean */
	313	saddr = (__force __be32)inet->inet_saddr;
	314	daddr = (__force __be32)inet->inet_daddr;
	315	sport = (__force __be16)inet->inet_sport;
	316	dport = (__force __be16)inet->inet_dport;
	317	}
2309e9e0	318
db02754c SM	319	/* XXX sigh, inet-> doesn't have sparse annotation so any
	320	* use of it here generates a warning with -Wbitwise */
	321	seq_printf(seq, "%p:\n"
	322	" krefs: %d\n"
	323	" sock: %pI4:%u -> "
	324	"%pI4:%u\n"
	325	" remote node: %s\n"
	326	" page off: %zu\n"
	327	" handshake ok: %u\n"
	328	" timer: %lld usecs\n"
	329	" data ready: %lld usecs\n"
	330	" advance start: %lld usecs\n"
	331	" advance stop: %lld usecs\n"
	332	" func start: %lld usecs\n"
	333	" func stop: %lld usecs\n"
	334	" func key: 0x%08x\n"
	335	" func type: %u\n",
	336	sc,
2c935bc5	337	kref_read(&sc->sc_kref),
db02754c SM	338	&saddr, inet ? ntohs(sport) : 0,
	339	&daddr, inet ? ntohs(dport) : 0,
	340	sc->sc_node->nd_name,
	341	sc->sc_page_off,
	342	sc->sc_handshake_ok,
	343	(long long)ktime_to_us(sc->sc_tv_timer),
	344	(long long)ktime_to_us(sc->sc_tv_data_ready),
	345	(long long)ktime_to_us(sc->sc_tv_advance_start),
	346	(long long)ktime_to_us(sc->sc_tv_advance_stop),
	347	(long long)ktime_to_us(sc->sc_tv_func_start),
	348	(long long)ktime_to_us(sc->sc_tv_func_stop),
	349	sc->sc_msg_key,
	350	sc->sc_msg_type);
	351	}
2309e9e0	352
db02754c SM	353	static int sc_seq_show(struct seq_file seq, void v)
	354	{
	355	struct o2net_sock_debug *sd = seq->private;
	356	struct o2net_sock_container sc, dummy_sc = sd->dbg_sock;
2309e9e0	357
db02754c SM	358	spin_lock(&o2net_debug_lock);
db02754c SM	359	sc = next_sc(dummy_sc);
2309e9e0	360
db02754c SM	361	if (sc) {
	362	if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
	363	sc_show_sock_container(seq, sc);
	364	else
	365	sc_show_sock_stats(seq, sc);
2309e9e0 SM	366	}
2309e9e0 SM	367
2309e9e0 SM	368	spin_unlock(&o2net_debug_lock);
	369
	370	return 0;
	371	}
	372
	373	static void sc_seq_stop(struct seq_file seq, void v)
	374	{
	375	}
	376
88e9d34c	377	static const struct seq_operations sc_seq_ops = {
2309e9e0 SM	378	.start = sc_seq_start,
	379	.next = sc_seq_next,
	380	.stop = sc_seq_stop,
	381	.show = sc_seq_show,
	382	};
	383
f3288338	384	static int sc_common_open(struct file *file, int ctxt)
2309e9e0	385	{
f3288338	386	struct o2net_sock_debug *sd;
2309e9e0	387	struct o2net_sock_container *dummy_sc;
2309e9e0	388
f3288338 RJ	389	dummy_sc = kzalloc(sizeof(*dummy_sc), GFP_KERNEL);
	390	if (!dummy_sc)
	391	return -ENOMEM;
2309e9e0	392
f3288338 RJ	393	sd = __seq_open_private(file, &sc_seq_ops, sizeof(*sd));
	394	if (!sd) {
	395	kfree(dummy_sc);
	396	return -ENOMEM;
	397	}
2309e9e0	398
f3288338	399	sd->dbg_ctxt = ctxt;
db02754c	400	sd->dbg_sock = dummy_sc;
2309e9e0	401
f3288338	402	o2net_debug_add_sc(dummy_sc);
2309e9e0	403
f3288338	404	return 0;
2309e9e0 SM	405	}
	406
	407	static int sc_fop_release(struct inode inode, struct file file)
	408	{
	409	struct seq_file *seq = file->private_data;
db02754c SM	410	struct o2net_sock_debug *sd = seq->private;
db02754c SM	411	struct o2net_sock_container *dummy_sc = sd->dbg_sock;
2309e9e0 SM	412
2309e9e0 SM	413	o2net_debug_del_sc(dummy_sc);
25b1c72e	414	kfree(dummy_sc);
2309e9e0 SM	415	return seq_release_private(inode, file);
	416	}
	417
db02754c SM	418	static int stats_fop_open(struct inode inode, struct file file)
db02754c SM	419	{
f3288338	420	return sc_common_open(file, SHOW_SOCK_STATS);
db02754c SM	421	}
	422
	423	static const struct file_operations stats_seq_fops = {
	424	.open = stats_fop_open,
	425	.read = seq_read,
	426	.llseek = seq_lseek,
	427	.release = sc_fop_release,
	428	};
	429
	430	static int sc_fop_open(struct inode inode, struct file file)
	431	{
f3288338	432	return sc_common_open(file, SHOW_SOCK_CONTAINERS);
db02754c SM	433	}
db02754c SM	434
828c0950	435	static const struct file_operations sc_seq_fops = {
2309e9e0 SM	436	.open = sc_fop_open,
	437	.read = seq_read,
	438	.llseek = seq_lseek,
	439	.release = sc_fop_release,
	440	};
	441
3ba169cc	442	static int o2net_fill_bitmap(char *buf, int len)
2309e9e0	443	{
3ba169cc SM	444	unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
3ba169cc SM	445	int i = -1, out = 0;
2309e9e0	446
3ba169cc	447	o2net_fill_node_map(map, sizeof(map));
2309e9e0	448
3ba169cc SM	449	while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
	450	out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
	451	out += snprintf(buf + out, PAGE_SIZE - out, "\n");
2309e9e0	452
3ba169cc SM	453	return out;
	454	}
	455
	456	static int nodes_fop_open(struct inode inode, struct file file)
	457	{
	458	char *buf;
	459
	460	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	461	if (!buf)
	462	return -ENOMEM;
	463
	464	i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
	465
	466	file->private_data = buf;
db02754c	467
2309e9e0	468	return 0;
2309e9e0 SM	469	}
2309e9e0 SM	470
3ba169cc SM	471	static int o2net_debug_release(struct inode inode, struct file file)
	472	{
	473	kfree(file->private_data);
	474	return 0;
	475	}
	476
	477	static ssize_t o2net_debug_read(struct file file, char __user buf,
	478	size_t nbytes, loff_t *ppos)
	479	{
	480	return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
	481	i_size_read(file->f_mapping->host));
	482	}
	483
	484	static const struct file_operations nodes_fops = {
	485	.open = nodes_fop_open,
	486	.release = o2net_debug_release,
	487	.read = o2net_debug_read,
	488	.llseek = generic_file_llseek,
	489	};
	490
2309e9e0 SM	491	void o2net_debugfs_exit(void)
2309e9e0 SM	492	{
3ba169cc	493	debugfs_remove(nodes_dentry);
db02754c	494	debugfs_remove(stats_dentry);
37096a79 SM	495	debugfs_remove(sc_dentry);
	496	debugfs_remove(nst_dentry);
	497	debugfs_remove(o2net_dentry);
2309e9e0 SM	498	}
2309e9e0 SM	499
3ba169cc SM	500	int o2net_debugfs_init(void)
3ba169cc SM	501	{
f4ae40a6	502	umode_t mode = S_IFREG\|S_IRUSR;
3ba169cc SM	503
	504	o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
	505	if (o2net_dentry)
	506	nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
	507	o2net_dentry, NULL, &nst_seq_fops);
	508	if (nst_dentry)
	509	sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
	510	o2net_dentry, NULL, &sc_seq_fops);
	511	if (sc_dentry)
	512	stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
	513	o2net_dentry, NULL, &stats_seq_fops);
	514	if (stats_dentry)
	515	nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
	516	o2net_dentry, NULL, &nodes_fops);
	517	if (nodes_dentry)
	518	return 0;
	519
	520	o2net_debugfs_exit();
	521	mlog_errno(-ENOMEM);
	522	return -ENOMEM;
	523	}
	524
2309e9e0	525	#endif /* CONFIG_DEBUG_FS */