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Linux 4.8-rc8
[linux/fpc-iii.git] / fs / ocfs2 / cluster / netdebug.c
blob27d1242c8383ba6a6962749cc4443d2feef77c93
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"
49 #define STATS_DEBUG_NAME "stats"
50 #define NODES_DEBUG_NAME "connected_nodes"
51
52 #define SHOW_SOCK_CONTAINERS 0
53 #define SHOW_SOCK_STATS 1
54
55 static struct dentry *o2net_dentry;
56 static struct dentry *sc_dentry;
57 static struct dentry *nst_dentry;
58 static struct dentry *stats_dentry;
59 static struct dentry *nodes_dentry;
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;
133 ktime_t now;
134 s64 sock, send, status;
135
136 spin_lock(&o2net_debug_lock);
137 nst = next_nst(dummy_nst);
138 if (!nst)
139 goto out;
140
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
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);
167
168 out:
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
178 static const struct seq_operations nst_seq_ops = {
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
189 dummy_nst = __seq_open_private(file, &nst_seq_ops, sizeof(*dummy_nst));
190 if (!dummy_nst)
191 return -ENOMEM;
192 o2net_debug_add_nst(dummy_nst);
193
194 return 0;
195 }
196
197 static int nst_fop_release(struct inode *inode, struct file *file)
198 {
199 struct seq_file *seq = file->private_data;
200 struct o2net_send_tracking *dummy_nst = seq->private;
201
202 o2net_debug_del_nst(dummy_nst);
203 return seq_release_private(inode, file);
204 }
205
206 static const struct file_operations nst_seq_fops = {
207 .open = nst_fop_open,
208 .read = seq_read,
209 .llseek = seq_lseek,
210 .release = nst_fop_release,
211 };
212
213 void o2net_debug_add_sc(struct o2net_sock_container *sc)
214 {
215 spin_lock(&o2net_debug_lock);
216 list_add(&sc->sc_net_debug_item, &sock_containers);
217 spin_unlock(&o2net_debug_lock);
218 }
219
220 void o2net_debug_del_sc(struct o2net_sock_container *sc)
221 {
222 spin_lock(&o2net_debug_lock);
223 list_del_init(&sc->sc_net_debug_item);
224 spin_unlock(&o2net_debug_lock);
225 }
226
227 struct o2net_sock_debug {
228 int dbg_ctxt;
229 struct o2net_sock_container *dbg_sock;
230 };
231
232 static struct o2net_sock_container
233 *next_sc(struct o2net_sock_container *sc_start)
234 {
235 struct o2net_sock_container *sc, *ret = NULL;
236
237 assert_spin_locked(&o2net_debug_lock);
238
239 list_for_each_entry(sc, &sc_start->sc_net_debug_item,
240 sc_net_debug_item) {
241 /* discover the head of the list miscast as a sc */
242 if (&sc->sc_net_debug_item == &sock_containers)
243 break;
244
245 /* use sc_page to detect real scs in the list */
246 if (sc->sc_page != NULL) {
247 ret = sc;
248 break;
249 }
250 }
251
252 return ret;
253 }
254
255 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
256 {
257 struct o2net_sock_debug *sd = seq->private;
258 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
259
260 spin_lock(&o2net_debug_lock);
261 sc = next_sc(dummy_sc);
262 spin_unlock(&o2net_debug_lock);
263
264 return sc;
265 }
266
267 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
268 {
269 struct o2net_sock_debug *sd = seq->private;
270 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
271
272 spin_lock(&o2net_debug_lock);
273 sc = next_sc(dummy_sc);
274 list_del_init(&dummy_sc->sc_net_debug_item);
275 if (sc)
276 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
277 spin_unlock(&o2net_debug_lock);
278
279 return sc; /* unused, just needs to be null when done */
280 }
281
282 #ifdef CONFIG_OCFS2_FS_STATS
283 # define sc_send_count(_s) ((_s)->sc_send_count)
284 # define sc_recv_count(_s) ((_s)->sc_recv_count)
285 # define sc_tv_acquiry_total_ns(_s) (ktime_to_ns((_s)->sc_tv_acquiry_total))
286 # define sc_tv_send_total_ns(_s) (ktime_to_ns((_s)->sc_tv_send_total))
287 # define sc_tv_status_total_ns(_s) (ktime_to_ns((_s)->sc_tv_status_total))
288 # define sc_tv_process_total_ns(_s) (ktime_to_ns((_s)->sc_tv_process_total))
289 #else
290 # define sc_send_count(_s) (0U)
291 # define sc_recv_count(_s) (0U)
292 # define sc_tv_acquiry_total_ns(_s) (0LL)
293 # define sc_tv_send_total_ns(_s) (0LL)
294 # define sc_tv_status_total_ns(_s) (0LL)
295 # define sc_tv_process_total_ns(_s) (0LL)
296 #endif
297
298 /* So that debugfs.ocfs2 can determine which format is being used */
299 #define O2NET_STATS_STR_VERSION 1
300 static void sc_show_sock_stats(struct seq_file *seq,
301 struct o2net_sock_container *sc)
302 {
303 if (!sc)
304 return;
305
306 seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
307 sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
308 (long long)sc_tv_acquiry_total_ns(sc),
309 (long long)sc_tv_send_total_ns(sc),
310 (long long)sc_tv_status_total_ns(sc),
311 (unsigned long)sc_recv_count(sc),
312 (long long)sc_tv_process_total_ns(sc));
313 }
314
315 static void sc_show_sock_container(struct seq_file *seq,
316 struct o2net_sock_container *sc)
317 {
318 struct inet_sock *inet = NULL;
319 __be32 saddr = 0, daddr = 0;
320 __be16 sport = 0, dport = 0;
321
322 if (!sc)
323 return;
324
325 if (sc->sc_sock) {
326 inet = inet_sk(sc->sc_sock->sk);
327 /* the stack's structs aren't sparse endian clean */
328 saddr = (__force __be32)inet->inet_saddr;
329 daddr = (__force __be32)inet->inet_daddr;
330 sport = (__force __be16)inet->inet_sport;
331 dport = (__force __be16)inet->inet_dport;
332 }
333
334 /* XXX sigh, inet-> doesn't have sparse annotation so any
335 * use of it here generates a warning with -Wbitwise */
336 seq_printf(seq, "%p:\n"
337 " krefs: %d\n"
338 " sock: %pI4:%u -> "
339 "%pI4:%u\n"
340 " remote node: %s\n"
341 " page off: %zu\n"
342 " handshake ok: %u\n"
343 " timer: %lld usecs\n"
344 " data ready: %lld usecs\n"
345 " advance start: %lld usecs\n"
346 " advance stop: %lld usecs\n"
347 " func start: %lld usecs\n"
348 " func stop: %lld usecs\n"
349 " func key: 0x%08x\n"
350 " func type: %u\n",
351 sc,
352 atomic_read(&sc->sc_kref.refcount),
353 &saddr, inet ? ntohs(sport) : 0,
354 &daddr, inet ? ntohs(dport) : 0,
355 sc->sc_node->nd_name,
356 sc->sc_page_off,
357 sc->sc_handshake_ok,
358 (long long)ktime_to_us(sc->sc_tv_timer),
359 (long long)ktime_to_us(sc->sc_tv_data_ready),
360 (long long)ktime_to_us(sc->sc_tv_advance_start),
361 (long long)ktime_to_us(sc->sc_tv_advance_stop),
362 (long long)ktime_to_us(sc->sc_tv_func_start),
363 (long long)ktime_to_us(sc->sc_tv_func_stop),
364 sc->sc_msg_key,
365 sc->sc_msg_type);
366 }
367
368 static int sc_seq_show(struct seq_file *seq, void *v)
369 {
370 struct o2net_sock_debug *sd = seq->private;
371 struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
372
373 spin_lock(&o2net_debug_lock);
374 sc = next_sc(dummy_sc);
375
376 if (sc) {
377 if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
378 sc_show_sock_container(seq, sc);
379 else
380 sc_show_sock_stats(seq, sc);
381 }
382
383 spin_unlock(&o2net_debug_lock);
384
385 return 0;
386 }
387
388 static void sc_seq_stop(struct seq_file *seq, void *v)
389 {
390 }
391
392 static const struct seq_operations sc_seq_ops = {
393 .start = sc_seq_start,
394 .next = sc_seq_next,
395 .stop = sc_seq_stop,
396 .show = sc_seq_show,
397 };
398
399 static int sc_common_open(struct file *file, int ctxt)
400 {
401 struct o2net_sock_debug *sd;
402 struct o2net_sock_container *dummy_sc;
403
404 dummy_sc = kzalloc(sizeof(*dummy_sc), GFP_KERNEL);
405 if (!dummy_sc)
406 return -ENOMEM;
407
408 sd = __seq_open_private(file, &sc_seq_ops, sizeof(*sd));
409 if (!sd) {
410 kfree(dummy_sc);
411 return -ENOMEM;
412 }
413
414 sd->dbg_ctxt = ctxt;
415 sd->dbg_sock = dummy_sc;
416
417 o2net_debug_add_sc(dummy_sc);
418
419 return 0;
420 }
421
422 static int sc_fop_release(struct inode *inode, struct file *file)
423 {
424 struct seq_file *seq = file->private_data;
425 struct o2net_sock_debug *sd = seq->private;
426 struct o2net_sock_container *dummy_sc = sd->dbg_sock;
427
428 o2net_debug_del_sc(dummy_sc);
429 return seq_release_private(inode, file);
430 }
431
432 static int stats_fop_open(struct inode *inode, struct file *file)
433 {
434 return sc_common_open(file, SHOW_SOCK_STATS);
435 }
436
437 static const struct file_operations stats_seq_fops = {
438 .open = stats_fop_open,
439 .read = seq_read,
440 .llseek = seq_lseek,
441 .release = sc_fop_release,
442 };
443
444 static int sc_fop_open(struct inode *inode, struct file *file)
445 {
446 return sc_common_open(file, SHOW_SOCK_CONTAINERS);
447 }
448
449 static const struct file_operations sc_seq_fops = {
450 .open = sc_fop_open,
451 .read = seq_read,
452 .llseek = seq_lseek,
453 .release = sc_fop_release,
454 };
455
456 static int o2net_fill_bitmap(char *buf, int len)
457 {
458 unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
459 int i = -1, out = 0;
460
461 o2net_fill_node_map(map, sizeof(map));
462
463 while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
464 out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
465 out += snprintf(buf + out, PAGE_SIZE - out, "\n");
466
467 return out;
468 }
469
470 static int nodes_fop_open(struct inode *inode, struct file *file)
471 {
472 char *buf;
473
474 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
475 if (!buf)
476 return -ENOMEM;
477
478 i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
479
480 file->private_data = buf;
481
482 return 0;
483 }
484
485 static int o2net_debug_release(struct inode *inode, struct file *file)
486 {
487 kfree(file->private_data);
488 return 0;
489 }
490
491 static ssize_t o2net_debug_read(struct file *file, char __user *buf,
492 size_t nbytes, loff_t *ppos)
493 {
494 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
495 i_size_read(file->f_mapping->host));
496 }
497
498 static const struct file_operations nodes_fops = {
499 .open = nodes_fop_open,
500 .release = o2net_debug_release,
501 .read = o2net_debug_read,
502 .llseek = generic_file_llseek,
503 };
504
505 void o2net_debugfs_exit(void)
506 {
507 debugfs_remove(nodes_dentry);
508 debugfs_remove(stats_dentry);
509 debugfs_remove(sc_dentry);
510 debugfs_remove(nst_dentry);
511 debugfs_remove(o2net_dentry);
512 }
513
514 int o2net_debugfs_init(void)
515 {
516 umode_t mode = S_IFREG|S_IRUSR;
517
518 o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
519 if (o2net_dentry)
520 nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
521 o2net_dentry, NULL, &nst_seq_fops);
522 if (nst_dentry)
523 sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
524 o2net_dentry, NULL, &sc_seq_fops);
525 if (sc_dentry)
526 stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
527 o2net_dentry, NULL, &stats_seq_fops);
528 if (stats_dentry)
529 nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
530 o2net_dentry, NULL, &nodes_fops);
531 if (nodes_dentry)
532 return 0;
533
534 o2net_debugfs_exit();
535 mlog_errno(-ENOMEM);
536 return -ENOMEM;
537 }
538
539 #endif /* CONFIG_DEBUG_FS */
Linux with added FPC-III support